xref: /freebsd/contrib/tzdata/NEWS (revision d2cccdef30376b7de5643caae1ef035f8e6932f0)
1ba2b2efdSGlen BarberNews for the tz database
2ba2b2efdSGlen Barber
3*d2cccdefSPhilip PaepsRelease 2025b - 2025-03-22 13:40:46 -0700
4*d2cccdefSPhilip Paeps
5*d2cccdefSPhilip Paeps  Briefly:
6*d2cccdefSPhilip Paeps    New zone for Aysén Region in Chile which moves from -04/-03 to -03.
7*d2cccdefSPhilip Paeps
8*d2cccdefSPhilip Paeps  Changes to future timestamps
9*d2cccdefSPhilip Paeps
10*d2cccdefSPhilip Paeps    Chile's Aysén Region moves from -04/-03 to -03 year-round, joining
11*d2cccdefSPhilip Paeps    Magallanes Region.  The region will not change its clocks on
12*d2cccdefSPhilip Paeps    2025-04-05 at 24:00, diverging from America/Santiago and creating a
13*d2cccdefSPhilip Paeps    new zone America/Coyhaique.  (Thanks to Yonathan Dossow.)  Model
14*d2cccdefSPhilip Paeps    this as a change to standard offset effective 2025-03-20.
15*d2cccdefSPhilip Paeps
16*d2cccdefSPhilip Paeps  Changes to past timestamps
17*d2cccdefSPhilip Paeps
18*d2cccdefSPhilip Paeps    Iran switched from +04 to +0330 on 1978-11-10 at 24:00, not at
19*d2cccdefSPhilip Paeps    year end.  (Thanks to Roozbeh Pournader.)
20*d2cccdefSPhilip Paeps
21*d2cccdefSPhilip Paeps  Changes to code
22*d2cccdefSPhilip Paeps
23*d2cccdefSPhilip Paeps    'zic -l TIMEZONE -d . -l /some/other/file/system' no longer
24*d2cccdefSPhilip Paeps    attempts to create an incorrect symlink, and no longer has a
25*d2cccdefSPhilip Paeps    read buffer underflow.  (Problem reported by Evgeniy Gorbanev.)
26*d2cccdefSPhilip Paeps
27*d2cccdefSPhilip Paeps
2846226b01SPhilip PaepsRelease 2025a - 2025-01-15 10:47:24 -0800
2946226b01SPhilip Paeps
3046226b01SPhilip Paeps  Briefly:
31*d2cccdefSPhilip Paeps    Paraguay adopted permanent -03 starting spring 2024.
3246226b01SPhilip Paeps    Improve pre-1991 data for the Philippines.
3346226b01SPhilip Paeps    Etc/Unknown is now reserved.
3446226b01SPhilip Paeps
3546226b01SPhilip Paeps  Changes to future timestamps
3646226b01SPhilip Paeps
37*d2cccdefSPhilip Paeps    Paraguay stopped changing its clocks after the spring-forward
3846226b01SPhilip Paeps    transition on 2024-10-06, so it is now permanently at -03.
3946226b01SPhilip Paeps    (Thanks to Heitor David Pinto and Even Scharning.)
4046226b01SPhilip Paeps    This affects timestamps starting 2025-03-22, as well as the
4146226b01SPhilip Paeps    obsolescent tm_isdst flags starting 2024-10-15.
4246226b01SPhilip Paeps
4346226b01SPhilip Paeps  Changes to past timestamps
4446226b01SPhilip Paeps
4546226b01SPhilip Paeps    Correct timestamps for the Philippines before 1900, and from 1937
4646226b01SPhilip Paeps    through 1990.  (Thanks to P Chan for the heads-up and citations.)
4746226b01SPhilip Paeps    This includes adjusting local mean time before 1899; fixing
4846226b01SPhilip Paeps    transitions in September 1899, January 1937, and June 1954; adding
4946226b01SPhilip Paeps    transitions in December 1941, November 1945, March and September
5046226b01SPhilip Paeps    1977, and May and July 1990; and removing incorrect transitions in
5146226b01SPhilip Paeps    March and September 1978.
5246226b01SPhilip Paeps
5346226b01SPhilip Paeps  Changes to data
5446226b01SPhilip Paeps
5546226b01SPhilip Paeps    Add zone1970.tab lines for the Concordia and Eyre Bird Observatory
5646226b01SPhilip Paeps    research stations.  (Thanks to Derick Rethans and Jule Dabars.)
5746226b01SPhilip Paeps
5846226b01SPhilip Paeps  Changes to code
5946226b01SPhilip Paeps
6046226b01SPhilip Paeps    strftime %s now generates the correct numeric string even when the
6146226b01SPhilip Paeps    represented number does not fit into time_t.  This is better than
6246226b01SPhilip Paeps    generating the numeric equivalent of (time_t) -1, as strftime did
6346226b01SPhilip Paeps    in TZDB releases 96a (when %s was introduced) through 2020a and in
6446226b01SPhilip Paeps    releases 2022b through 2024b.  It is also better than failing and
6546226b01SPhilip Paeps    returning 0, as strftime did in releases 2020b through 2022a.
6646226b01SPhilip Paeps
6746226b01SPhilip Paeps    strftime now outputs an invalid conversion specifier as-is,
6846226b01SPhilip Paeps    instead of eliding the leading '%', which confused debugging.
6946226b01SPhilip Paeps
7046226b01SPhilip Paeps    An invalid TZ now generates the time zone abbreviation "-00", not
7146226b01SPhilip Paeps    "UTC", to help the user see that an error has occurred.  (Thanks
7246226b01SPhilip Paeps    to Arthur David Olson for suggesting a "wrong result".)
7346226b01SPhilip Paeps
7446226b01SPhilip Paeps    mktime and timeoff no longer incorrectly fail merely because a
7546226b01SPhilip Paeps    struct tm component near INT_MIN or INT_MAX overflows when a
7646226b01SPhilip Paeps    lower-order component carries into it.
7746226b01SPhilip Paeps
7846226b01SPhilip Paeps    TZNAME_MAXIMUM, the maximum number of bytes in a proleptic TZ
7946226b01SPhilip Paeps    string's time zone abbreviation, now defaults to 254 not 255.
8046226b01SPhilip Paeps    This helps reduce the size of internal state from 25480 to 21384
8146226b01SPhilip Paeps    on common platforms.  This change should not be a problem, as
8246226b01SPhilip Paeps    nobody uses such long "abbreviations" and the longstanding tzcode
8346226b01SPhilip Paeps    maximum was 16 until release 2023a.  For those who prefer no
8446226b01SPhilip Paeps    arbitrary limits, you can now specify TZNAME_MAXIMUM values up to
8546226b01SPhilip Paeps    PTRDIFF_MAX, a limit forced by C anyway; formerly tzcode silently
8646226b01SPhilip Paeps    misbehaved unless TZNAME_MAXIMUM was less than INT_MAX.
8746226b01SPhilip Paeps
8846226b01SPhilip Paeps    tzset and related functions no longer leak a file descriptor if
8946226b01SPhilip Paeps    another thread forks or execs at about the same time and if the
9046226b01SPhilip Paeps    platform has O_CLOFORK and O_CLOEXEC respectively.  Also, the
9146226b01SPhilip Paeps    functions no longer let a TZif file become a controlling terminal.
9246226b01SPhilip Paeps
9346226b01SPhilip Paeps    'zdump -' now reads TZif data from /dev/stdin.
9446226b01SPhilip Paeps    (From a question by Arthur David Olson.)
9546226b01SPhilip Paeps
9646226b01SPhilip Paeps  Changes to documentation
9746226b01SPhilip Paeps
9846226b01SPhilip Paeps    The name Etc/Unknown is now reserved: it will not be used by TZDB.
9946226b01SPhilip Paeps    This is for compatibility with CLDR, which uses the string
10046226b01SPhilip Paeps    "Etc/Unknown" for an unknown or invalid timezone.  (Thanks to
10146226b01SPhilip Paeps    Justin Grant, Mark Davis, and Guy Harris.)
10246226b01SPhilip Paeps
10346226b01SPhilip Paeps    Cite Internet RFC 9636, which obsoletes RFC 8536 for TZif format.
10446226b01SPhilip Paeps
10546226b01SPhilip Paeps
106e273650fSPhilip PaepsRelease 2024b - 2024-09-04 12:27:47 -0700
107e273650fSPhilip Paeps
108e273650fSPhilip Paeps  Briefly:
109e273650fSPhilip Paeps    Improve historical data for Mexico, Mongolia, and Portugal.
110e273650fSPhilip Paeps    System V names are now obsolescent.
111e273650fSPhilip Paeps    The main data form now uses %z.
112e273650fSPhilip Paeps    The code now conforms to RFC 8536 for early timestamps.
113e273650fSPhilip Paeps    Support POSIX.1-2024, which removes asctime_r and ctime_r.
114e273650fSPhilip Paeps    Assume POSIX.2-1992 or later for shell scripts.
115e273650fSPhilip Paeps    SUPPORT_C89 now defaults to 1.
116e273650fSPhilip Paeps
117e273650fSPhilip Paeps  Changes to past timestamps
118e273650fSPhilip Paeps
119e273650fSPhilip Paeps    Asia/Choibalsan is now an alias for Asia/Ulaanbaatar rather than
120e273650fSPhilip Paeps    being a separate Zone with differing behavior before April 2008.
121e273650fSPhilip Paeps    This seems better given our wildly conflicting information about
122e273650fSPhilip Paeps    Mongolia's time zone history.  (Thanks to Heitor David Pinto.)
123e273650fSPhilip Paeps
124e273650fSPhilip Paeps    Historical transitions for Mexico have been updated based on
125e273650fSPhilip Paeps    official Mexican decrees.  The affected timestamps occur during
126e273650fSPhilip Paeps    the years 1921-1927, 1931, 1945, 1949-1970, and 1981-1997.
127e273650fSPhilip Paeps    The affected zones are America/Bahia_Banderas, America/Cancun,
128e273650fSPhilip Paeps    America/Chihuahua, America/Ciudad_Juarez, America/Hermosillo,
129e273650fSPhilip Paeps    America/Mazatlan, America/Merida, America/Mexico_City,
130e273650fSPhilip Paeps    America/Monterrey, America/Ojinaga, and America/Tijuana.
131e273650fSPhilip Paeps    (Thanks to Heitor David Pinto.)
132e273650fSPhilip Paeps
133e273650fSPhilip Paeps    Historical transitions for Portugal, represented by Europe/Lisbon,
134e273650fSPhilip Paeps    Atlantic/Azores, and Atlantic/Madeira, have been updated based on a
135e273650fSPhilip Paeps    close reading of old Portuguese legislation, replacing previous data
136e273650fSPhilip Paeps    mainly originating from Whitman and Shanks & Pottenger.  These
137e273650fSPhilip Paeps    changes affect a few transitions in 1917-1921, 1924, and 1940
138e273650fSPhilip Paeps    throughout these regions by a few hours or days, and various
139e273650fSPhilip Paeps    timestamps between 1977 and 1993 depending on the region.  In
140e273650fSPhilip Paeps    particular, the Azores and Madeira did not observe DST from 1977 to
141e273650fSPhilip Paeps    1981.  Additionally, the adoption of standard zonal time in former
142e273650fSPhilip Paeps    Portuguese colonies have been adjusted: Africa/Maputo in 1909, and
143e273650fSPhilip Paeps    Asia/Dili by 22 minutes at the start of 1912.
144e273650fSPhilip Paeps    (Thanks to Tim Parenti.)
145e273650fSPhilip Paeps
146e273650fSPhilip Paeps  Changes to past tm_isdst flags
147e273650fSPhilip Paeps
148e273650fSPhilip Paeps    The period from 1966-04-03 through 1966-10-02 in Portugal is now
149e273650fSPhilip Paeps    modeled as DST, to more closely reflect how contemporaneous changes
150e273650fSPhilip Paeps    in law entered into force.
151e273650fSPhilip Paeps
152e273650fSPhilip Paeps  Changes to data
153e273650fSPhilip Paeps
154e273650fSPhilip Paeps    Names present only for compatibility with UNIX System V
155e273650fSPhilip Paeps    (last released in the 1990s) have been moved to 'backward'.
156e273650fSPhilip Paeps    These names, which for post-1970 timestamps mostly just duplicate
157e273650fSPhilip Paeps    data of geographical names, were confusing downstream uses.
158e273650fSPhilip Paeps    Names moved to 'backward' are now links to geographical names.
159e273650fSPhilip Paeps    This affects behavior for TZ='EET' for some pre-1981 timestamps,
160e273650fSPhilip Paeps    for TZ='CET' for some pre-1947 timestamps, and for TZ='WET' for
161e273650fSPhilip Paeps    some pre-1996 timestamps.  Also, TZ='MET' now behaves like
162e273650fSPhilip Paeps    TZ='CET' and so uses the abbreviation "CET" rather than "MET".
163e273650fSPhilip Paeps    Those needing the previous TZDB behavior, which does not match any
164e273650fSPhilip Paeps    real-world clocks, can find the old entries in 'backzone'.
165e273650fSPhilip Paeps    (Problem reported by Justin Grant.)
166e273650fSPhilip Paeps
167e273650fSPhilip Paeps    The main source files' time zone abbreviations now use %z,
168e273650fSPhilip Paeps    supported by zic since release 2015f and used in vanguard form
169e273650fSPhilip Paeps    since release 2022b.  For example, America/Sao_Paulo now contains
170e273650fSPhilip Paeps    the zone continuation line "-3:00 Brazil %z", which is less error
171e273650fSPhilip Paeps    prone than the old "-3:00 Brazil -03/-02".  This does not change
172e273650fSPhilip Paeps    the represented data: the generated TZif files are unchanged.
173e273650fSPhilip Paeps    Rearguard form still avoids %z, to support obsolescent parsers.
174e273650fSPhilip Paeps
175e273650fSPhilip Paeps    Asia/Almaty has been removed from zonenow.tab as it now agrees
176e273650fSPhilip Paeps    with Asia/Tashkent for future timestamps, due to Kazakhstan's
177e273650fSPhilip Paeps    2024-02-29 time zone change.  Similarly, America/Scoresbysund
178e273650fSPhilip Paeps    has been removed, as it now agrees with America/Nuuk due to
179e273650fSPhilip Paeps    its 2024-03-31 time zone change.
180e273650fSPhilip Paeps
181e273650fSPhilip Paeps  Changes to code
182e273650fSPhilip Paeps
183e273650fSPhilip Paeps    localtime.c now always uses a TZif file's time type 0 to handle
184e273650fSPhilip Paeps    timestamps before the file's first transition.  Formerly,
185e273650fSPhilip Paeps    localtime.c sometimes inferred a different time type, in order to
186e273650fSPhilip Paeps    handle problematic data generated by zic 2018e or earlier.  As it
187e273650fSPhilip Paeps    is now safe to assume more recent versions of zic, there is no
188e273650fSPhilip Paeps    longer a pressing need to fail to conform RFC 8536 section 3.2,
189e273650fSPhilip Paeps    which requires using time type 0 in this situation.  This change
190e273650fSPhilip Paeps    does not affect behavior when reading TZif files generated by zic
191e273650fSPhilip Paeps    2018f and later.
192e273650fSPhilip Paeps
193e273650fSPhilip Paeps    POSIX.1-2024 removes asctime_r and ctime_r and does not let
194e273650fSPhilip Paeps    libraries define them, so remove them except when needed to
195e273650fSPhilip Paeps    conform to earlier POSIX.  These functions are dangerous as they
196e273650fSPhilip Paeps    can overrun user buffers.  If you still need them, add
197e273650fSPhilip Paeps    -DSUPPORT_POSIX2008 to CFLAGS.
198e273650fSPhilip Paeps
199e273650fSPhilip Paeps    The SUPPORT_C89 option now defaults to 1 instead of 0, fixing a
200e273650fSPhilip Paeps    POSIX-conformance bug introduced in 2023a.
201e273650fSPhilip Paeps
202e273650fSPhilip Paeps    tzselect now supports POSIX.1-2024 proleptic TZ strings.  Also, it
203e273650fSPhilip Paeps    assumes POSIX.2-1992 or later, as practical porting targets now
204e273650fSPhilip Paeps    all support that, and it uses some features from POSIX.1-2024 if
205e273650fSPhilip Paeps    available.
206e273650fSPhilip Paeps
207e273650fSPhilip Paeps  Changes to build procedure
208e273650fSPhilip Paeps
209e273650fSPhilip Paeps    'make check' no longer requires curl and Internet access.
210e273650fSPhilip Paeps
211e273650fSPhilip Paeps    The build procedure now assumes POSIX.2-1992 or later, to simplify
212e273650fSPhilip Paeps    maintenance.  To build on Solaris 10, the only extant system still
213e273650fSPhilip Paeps    defaulting to pre-POSIX, prepend /usr/xpg4/bin to PATH.
214e273650fSPhilip Paeps
215e273650fSPhilip Paeps  Changes to documentation
216e273650fSPhilip Paeps
217e273650fSPhilip Paeps    The documentation now reflects POSIX.1-2024.
218e273650fSPhilip Paeps
219e273650fSPhilip Paeps  Changes to commentary
220e273650fSPhilip Paeps
221e273650fSPhilip Paeps    Commentary about historical transitions in Portugal and her former
22246226b01SPhilip Paeps    colonies has been expanded with links to relevant legislation.
223e273650fSPhilip Paeps    (Thanks to Tim Parenti.)
224e273650fSPhilip Paeps
225e273650fSPhilip Paeps
2262723c7ffSPhilip PaepsRelease 2024a - 2024-02-01 09:28:56 -0800
2272723c7ffSPhilip Paeps
2282723c7ffSPhilip Paeps  Briefly:
2292723c7ffSPhilip Paeps    Kazakhstan unifies on UTC+5 beginning 2024-03-01.
2302723c7ffSPhilip Paeps    Palestine springs forward a week later after Ramadan.
2312723c7ffSPhilip Paeps    zic no longer pretends to support indefinite-past DST.
2322723c7ffSPhilip Paeps    localtime no longer mishandles Ciudad Juárez in 2422.
2332723c7ffSPhilip Paeps
2342723c7ffSPhilip Paeps  Changes to future timestamps
2352723c7ffSPhilip Paeps
2362723c7ffSPhilip Paeps    Kazakhstan unifies on UTC+5.  This affects Asia/Almaty and
2372723c7ffSPhilip Paeps    Asia/Qostanay which together represent the eastern portion of the
2382723c7ffSPhilip Paeps    country that will transition from UTC+6 on 2024-03-01 at 00:00 to
2392723c7ffSPhilip Paeps    join the western portion.  (Thanks to Zhanbolat Raimbekov.)
2402723c7ffSPhilip Paeps
2412723c7ffSPhilip Paeps    Palestine springs forward a week later than previously predicted
2422723c7ffSPhilip Paeps    in 2024 and 2025.  (Thanks to Heba Hamad.)  Change spring-forward
2432723c7ffSPhilip Paeps    predictions to the second Saturday after Ramadan, not the first;
2442723c7ffSPhilip Paeps    this also affects other predictions starting in 2039.
2452723c7ffSPhilip Paeps
2462723c7ffSPhilip Paeps  Changes to past timestamps
2472723c7ffSPhilip Paeps
2482723c7ffSPhilip Paeps    Asia/Ho_Chi_Minh's 1955-07-01 transition occurred at 01:00
2492723c7ffSPhilip Paeps    not 00:00.  (Thanks to Đoàn Trần Công Danh.)
2502723c7ffSPhilip Paeps
2512723c7ffSPhilip Paeps    From 1947 through 1949, Toronto's transitions occurred at 02:00
2522723c7ffSPhilip Paeps    not 00:00.  (Thanks to Chris Walton.)
2532723c7ffSPhilip Paeps
2542723c7ffSPhilip Paeps    In 1911 Miquelon adopted standard time on June 15, not May 15.
2552723c7ffSPhilip Paeps
2562723c7ffSPhilip Paeps  Changes to code
2572723c7ffSPhilip Paeps
2582723c7ffSPhilip Paeps    The FROM and TO columns of Rule lines can no longer be "minimum"
2592723c7ffSPhilip Paeps    or an abbreviation of "minimum", because TZif files do not support
2602723c7ffSPhilip Paeps    DST rules that extend into the indefinite past - although these
2612723c7ffSPhilip Paeps    rules were supported when TZif files had only 32-bit data, this
2622723c7ffSPhilip Paeps    stopped working when 64-bit TZif files were introduced in 1995.
2632723c7ffSPhilip Paeps    This should not be a problem for realistic data, since DST was
2642723c7ffSPhilip Paeps    first used in the 20th century.  As a transition aid, FROM columns
2652723c7ffSPhilip Paeps    like "minimum" are now diagnosed and then treated as if they were
2662723c7ffSPhilip Paeps    the year 1900; this should suffice for TZif files on old systems
2672723c7ffSPhilip Paeps    with only 32-bit time_t, and it is more compatible with bugs in
2682723c7ffSPhilip Paeps    2023c-and-earlier localtime.c.  (Problem reported by Yoshito
2692723c7ffSPhilip Paeps    Umaoka.)
2702723c7ffSPhilip Paeps
2712723c7ffSPhilip Paeps    localtime and related functions no longer mishandle some
2722723c7ffSPhilip Paeps    timestamps that occur about 400 years after a switch to a time
2732723c7ffSPhilip Paeps    zone with a DST schedule.  In 2023d data this problem was visible
2742723c7ffSPhilip Paeps    for some timestamps in November 2422, November 2822, etc. in
2752723c7ffSPhilip Paeps    America/Ciudad_Juarez.  (Problem reported by Gilmore Davidson.)
2762723c7ffSPhilip Paeps
2772723c7ffSPhilip Paeps    strftime %s now uses tm_gmtoff if available.  (Problem and draft
2782723c7ffSPhilip Paeps    patch reported by Dag-Erling Smørgrav.)
2792723c7ffSPhilip Paeps
2802723c7ffSPhilip Paeps  Changes to build procedure
2812723c7ffSPhilip Paeps
2822723c7ffSPhilip Paeps    The leap-seconds.list file is now copied from the IERS instead of
2832723c7ffSPhilip Paeps    from its downstream counterpart at NIST, as the IERS version is
2842723c7ffSPhilip Paeps    now in the public domain too and tends to be more up-to-date.
2852723c7ffSPhilip Paeps    (Thanks to Martin Burnicki for liaisoning with the IERS.)
2862723c7ffSPhilip Paeps
2872723c7ffSPhilip Paeps  Changes to documentation
2882723c7ffSPhilip Paeps
2892723c7ffSPhilip Paeps    The strftime man page documents which struct tm members affect
2902723c7ffSPhilip Paeps    which conversion specs, and that tzset is called.  (Problems
2912723c7ffSPhilip Paeps    reported by Robert Elz and Steve Summit.)
2922723c7ffSPhilip Paeps
2932723c7ffSPhilip Paeps
294eebb9c2cSPhilip PaepsRelease 2023d - 2023-12-21 20:02:24 -0800
295eebb9c2cSPhilip Paeps
296eebb9c2cSPhilip Paeps  Briefly:
297eebb9c2cSPhilip Paeps    Ittoqqortoormiit, Greenland changes time zones on 2024-03-31.
298eebb9c2cSPhilip Paeps    Vostok, Antarctica changed time zones on 2023-12-18.
299eebb9c2cSPhilip Paeps    Casey, Antarctica changed time zones five times since 2020.
300eebb9c2cSPhilip Paeps    Code and data fixes for Palestine timestamps starting in 2072.
301eebb9c2cSPhilip Paeps    A new data file zonenow.tab for timestamps starting now.
302eebb9c2cSPhilip Paeps
303eebb9c2cSPhilip Paeps  Changes to future timestamps
304eebb9c2cSPhilip Paeps
305eebb9c2cSPhilip Paeps    Ittoqqortoormiit, Greenland (America/Scoresbysund) joins most of
306eebb9c2cSPhilip Paeps    the rest of Greenland's timekeeping practice on 2024-03-31, by
307eebb9c2cSPhilip Paeps    changing its time zone from -01/+00 to -02/-01 at the same moment
308eebb9c2cSPhilip Paeps    as the spring-forward transition.  Its clocks will therefore not
309eebb9c2cSPhilip Paeps    spring forward as previously scheduled.  The time zone change
31046226b01SPhilip Paeps    reverts to its common practice before 1981.  (Thanks to Jule Dabars.)
311eebb9c2cSPhilip Paeps
312eebb9c2cSPhilip Paeps    Fix predictions for DST transitions in Palestine in 2072-2075,
31346226b01SPhilip Paeps    correcting a typo introduced in 2023a.  (Thanks to Jule Dabars.)
314eebb9c2cSPhilip Paeps
315eebb9c2cSPhilip Paeps  Changes to past and future timestamps
316eebb9c2cSPhilip Paeps
317eebb9c2cSPhilip Paeps    Vostok, Antarctica changed to +05 on 2023-12-18.  It had been at
318eebb9c2cSPhilip Paeps    +07 (not +06) for years.  (Thanks to Zakhary V. Akulov.)
319eebb9c2cSPhilip Paeps
320eebb9c2cSPhilip Paeps    Change data for Casey, Antarctica to agree with timeanddate.com,
321eebb9c2cSPhilip Paeps    by adding five time zone changes since 2020.  Casey is now at +08
322eebb9c2cSPhilip Paeps    instead of +11.
323eebb9c2cSPhilip Paeps
324eebb9c2cSPhilip Paeps  Changes to past tm_isdst flags
325eebb9c2cSPhilip Paeps
326eebb9c2cSPhilip Paeps    Much of Greenland, represented by America/Nuuk, changed its
327eebb9c2cSPhilip Paeps    standard time from -03 to -02 on 2023-03-25, not on 2023-10-28.
328eebb9c2cSPhilip Paeps    This does not affect UTC offsets, only the tm_isdst flag.
329eebb9c2cSPhilip Paeps    (Thanks to Thomas M. Steenholdt.)
330eebb9c2cSPhilip Paeps
331eebb9c2cSPhilip Paeps  New data file
332eebb9c2cSPhilip Paeps
333eebb9c2cSPhilip Paeps    A new data file zonenow.tab helps configure applications that use
334eebb9c2cSPhilip Paeps    timestamps dated from now on.  This simplifies configuration,
335eebb9c2cSPhilip Paeps    since users choose from a smaller Zone set.  The file's format is
336eebb9c2cSPhilip Paeps    experimental and subject to change.
337eebb9c2cSPhilip Paeps
338eebb9c2cSPhilip Paeps  Changes to code
339eebb9c2cSPhilip Paeps
340eebb9c2cSPhilip Paeps    localtime.c no longer mishandles TZif files that contain a single
341eebb9c2cSPhilip Paeps    transition into a DST regime.  Previously, it incorrectly assumed
342eebb9c2cSPhilip Paeps    DST was in effect before the transition too.  (Thanks to Alois
343eebb9c2cSPhilip Paeps    Treindl for debugging help.)
344eebb9c2cSPhilip Paeps
345eebb9c2cSPhilip Paeps    localtime.c's timeoff no longer collides with OpenBSD 7.4.
346eebb9c2cSPhilip Paeps
347eebb9c2cSPhilip Paeps    The C code now uses _Generic only if __STDC_VERSION__ says the
348eebb9c2cSPhilip Paeps    compiler is C11 or later.
349eebb9c2cSPhilip Paeps
350eebb9c2cSPhilip Paeps    tzselect now optionally reads zonenow.tab, to simplify when
351eebb9c2cSPhilip Paeps    configuring only for timestamps dated from now on.
352eebb9c2cSPhilip Paeps
353eebb9c2cSPhilip Paeps    tzselect no longer creates temporary files.
354eebb9c2cSPhilip Paeps
355eebb9c2cSPhilip Paeps    tzselect no longer mishandles the following:
356eebb9c2cSPhilip Paeps
357eebb9c2cSPhilip Paeps      Spaces and most other special characters in BUGEMAIL, PACKAGE,
358eebb9c2cSPhilip Paeps      TZDIR, and VERSION.
359eebb9c2cSPhilip Paeps
360eebb9c2cSPhilip Paeps      TZ strings when using mawk 1.4.3, which mishandles regular
361eebb9c2cSPhilip Paeps      expressions of the form /X{2,}/.
362eebb9c2cSPhilip Paeps
363eebb9c2cSPhilip Paeps      ISO 6709 coordinates when using an awk that lacks the GNU
364eebb9c2cSPhilip Paeps      extension of newlines in -v option-arguments.
365eebb9c2cSPhilip Paeps
366eebb9c2cSPhilip Paeps      Non UTF-8 locales when using an iconv command that lacks the GNU
367eebb9c2cSPhilip Paeps      //TRANSLIT extension.
368eebb9c2cSPhilip Paeps
369eebb9c2cSPhilip Paeps    zic no longer mishandles data for Palestine after the year 2075.
370eebb9c2cSPhilip Paeps    Previously, it incorrectly omitted post-2075 transitions that are
371eebb9c2cSPhilip Paeps    predicted for just before and just after Ramadan.  (Thanks to Ken
372eebb9c2cSPhilip Paeps    Murchison for debugging help.)
373eebb9c2cSPhilip Paeps
374eebb9c2cSPhilip Paeps    zic now works again on Linux 2.6.16 and 2.6.17 (2006).
375eebb9c2cSPhilip Paeps    (Problem reported by Rune Torgersen.)
376eebb9c2cSPhilip Paeps
377eebb9c2cSPhilip Paeps  Changes to build procedure
378eebb9c2cSPhilip Paeps
379eebb9c2cSPhilip Paeps    The Makefile is now more compatible with POSIX:
380eebb9c2cSPhilip Paeps     * It no longer defines AR, CC, CFLAGS, LDFLAGS, and SHELL.
381eebb9c2cSPhilip Paeps     * It no longer uses its own 'cc' in place of CC.
382eebb9c2cSPhilip Paeps     * It now uses ARFLAGS, with default specified by POSIX.
383eebb9c2cSPhilip Paeps     * It does not use LFLAGS incompatibly with POSIX.
384eebb9c2cSPhilip Paeps     * It uses the special .POSIX target.
385eebb9c2cSPhilip Paeps     * It quotes special characters more carefully.
386eebb9c2cSPhilip Paeps     * It no longer mishandles builds in an ISO 8859 locale.
387e273650fSPhilip Paeps    Due to the CC changes, TZDIR is now #defined in a file tzdir.h
388eebb9c2cSPhilip Paeps    built by 'make', not in a $(CC) -D option.  Also, TZDEFAULT is
389eebb9c2cSPhilip Paeps    now treated like TZDIR as they have similar roles.
390eebb9c2cSPhilip Paeps
391eebb9c2cSPhilip Paeps  Changes to commentary
392eebb9c2cSPhilip Paeps
393eebb9c2cSPhilip Paeps     Limitations and hazards of the optional support for obsolescent
394eebb9c2cSPhilip Paeps     C89 platforms are documented better, along with a tentative
395eebb9c2cSPhilip Paeps     schedule for removing this support.
396eebb9c2cSPhilip Paeps
397eebb9c2cSPhilip Paeps
3989fbeeb6eSPhilip PaepsRelease 2023c - 2023-03-28 12:42:14 -0700
3992084f6a4SPhilip Paeps
4009fbeeb6eSPhilip Paeps  Changes to past and future timestamps
4019fbeeb6eSPhilip Paeps
4029fbeeb6eSPhilip Paeps    Model Lebanon's DST chaos by reverting data to tzdb 2023a.
4039fbeeb6eSPhilip Paeps    (Thanks to Rany Hany for the heads-up.)
4049fbeeb6eSPhilip Paeps
4059fbeeb6eSPhilip Paeps
4069fbeeb6eSPhilip PaepsRelease 2023b - 2023-03-23 19:50:38 -0700
4072084f6a4SPhilip Paeps
4082084f6a4SPhilip Paeps  Changes to future timestamps
4092084f6a4SPhilip Paeps
4102084f6a4SPhilip Paeps    This year Lebanon springs forward April 20/21 not March 25/26.
4119fbeeb6eSPhilip Paeps    (Thanks to Saadallah Itani.)  [This was reverted in 2023c.]
4122084f6a4SPhilip Paeps
4132084f6a4SPhilip Paeps
414259e2ad7SPhilip PaepsRelease 2023a - 2023-03-22 12:39:33 -0700
415259e2ad7SPhilip Paeps
416259e2ad7SPhilip Paeps  Briefly:
417259e2ad7SPhilip Paeps    Egypt now uses DST again, from April through October.
418259e2ad7SPhilip Paeps    This year Morocco springs forward April 23, not April 30.
419259e2ad7SPhilip Paeps    Palestine delays the start of DST this year.
420259e2ad7SPhilip Paeps    Much of Greenland still uses DST from 2024 on.
421259e2ad7SPhilip Paeps    America/Yellowknife now links to America/Edmonton.
422259e2ad7SPhilip Paeps    tzselect can now use current time to help infer timezone.
423259e2ad7SPhilip Paeps    The code now defaults to C99 or later.
424259e2ad7SPhilip Paeps    Fix use of C23 attributes.
425259e2ad7SPhilip Paeps
426259e2ad7SPhilip Paeps  Changes to future timestamps
427259e2ad7SPhilip Paeps
428259e2ad7SPhilip Paeps    Starting in 2023, Egypt will observe DST from April's last Friday
429259e2ad7SPhilip Paeps    through October's last Thursday.  (Thanks to Ahmad ElDardiry.)
430259e2ad7SPhilip Paeps    Assume the transition times are 00:00 and 24:00, respectively.
431259e2ad7SPhilip Paeps
432259e2ad7SPhilip Paeps    In 2023 Morocco's spring-forward transition after Ramadan
433259e2ad7SPhilip Paeps    will occur April 23, not April 30.  (Thanks to Milamber.)
434259e2ad7SPhilip Paeps    Adjust predictions for future years accordingly.  This affects
435259e2ad7SPhilip Paeps    predictions for 2023, 2031, 2038, and later years.
436259e2ad7SPhilip Paeps
437259e2ad7SPhilip Paeps    This year Palestine will delay its spring forward from
438259e2ad7SPhilip Paeps    March 25 to April 29 due to Ramadan.  (Thanks to Heba Hamad.)
439259e2ad7SPhilip Paeps    Make guesses for future Ramadans too.
440259e2ad7SPhilip Paeps
441259e2ad7SPhilip Paeps    Much of Greenland, represented by America/Nuuk, will continue to
442259e2ad7SPhilip Paeps    observe DST using European Union rules.  When combined with
443259e2ad7SPhilip Paeps    Greenland's decision not to change the clocks in fall 2023,
444259e2ad7SPhilip Paeps    America/Nuuk therefore changes from -03/-02 to -02/-01 effective
445259e2ad7SPhilip Paeps    2023-10-29 at 01:00 UTC.  (Thanks to Thomas M. Steenholdt.)
446259e2ad7SPhilip Paeps    This change from 2022g doesn't affect timestamps until 2024-03-30,
447259e2ad7SPhilip Paeps    and doesn't affect tm_isdst until 2023-03-25.
448259e2ad7SPhilip Paeps
449259e2ad7SPhilip Paeps  Changes to past timestamps
450259e2ad7SPhilip Paeps
451259e2ad7SPhilip Paeps    America/Yellowknife has changed from a Zone to a backward
452259e2ad7SPhilip Paeps    compatibility Link, as it no longer differs from America/Edmonton
453259e2ad7SPhilip Paeps    since 1970.  (Thanks to Almaz Mingaleev.)  This affects some
454259e2ad7SPhilip Paeps    pre-1948 timestamps.  The old data are now in 'backzone'.
455259e2ad7SPhilip Paeps
456259e2ad7SPhilip Paeps  Changes to past time zone abbreviations
457259e2ad7SPhilip Paeps
458259e2ad7SPhilip Paeps    When observing Moscow time, Europe/Kirov and Europe/Volgograd now
459259e2ad7SPhilip Paeps    use the abbreviations MSK/MSD instead of numeric abbreviations,
460259e2ad7SPhilip Paeps    for consistency with other timezones observing Moscow time.
461259e2ad7SPhilip Paeps
462259e2ad7SPhilip Paeps  Changes to code
463259e2ad7SPhilip Paeps
464259e2ad7SPhilip Paeps    You can now tell tzselect local time, to simplify later choices.
465259e2ad7SPhilip Paeps    Select the 'time' option in its first prompt.
466259e2ad7SPhilip Paeps
467259e2ad7SPhilip Paeps    You can now compile with -DTZNAME_MAXIMUM=N to limit time zone
468259e2ad7SPhilip Paeps    abbreviations to N bytes (default 255).  The reference runtime
469259e2ad7SPhilip Paeps    library now rejects POSIX-style TZ strings that contain longer
470259e2ad7SPhilip Paeps    abbreviations, treating them as UTC.  Previously the limit was
471259e2ad7SPhilip Paeps    platform dependent and abbreviations were silently truncated to
472259e2ad7SPhilip Paeps    16 bytes even when the limit was greater than 16.
473259e2ad7SPhilip Paeps
474eebb9c2cSPhilip Paeps    The code by default is now designed for C99 or later.  To build on
475eebb9c2cSPhilip Paeps    a mostly-C89 platform, compile with -DPORT_TO_C89; this should
476eebb9c2cSPhilip Paeps    work on C89 platforms that also support C99 'long long' and
477eebb9c2cSPhilip Paeps    perhaps a few other extensions to C89.  To support C89 callers of
478eebb9c2cSPhilip Paeps    tzcode's library, compile with -DSUPPORT_C89; however, this could
479eebb9c2cSPhilip Paeps    trigger latent bugs in C99-or-later callers.  The two new macros
480eebb9c2cSPhilip Paeps    are transitional aids planned to be removed in a future version
481eebb9c2cSPhilip Paeps    (say, in 2029), when C99 or later will be required.
482259e2ad7SPhilip Paeps
483259e2ad7SPhilip Paeps    The code now builds again on pre-C99 platforms, if you compile
484259e2ad7SPhilip Paeps    with -DPORT_TO_C89.  This fixes a bug introduced in 2022f.
485259e2ad7SPhilip Paeps
486259e2ad7SPhilip Paeps    On C23-compatible platforms tzcode no longer uses syntax like
487259e2ad7SPhilip Paeps    'static [[noreturn]] void usage(void);'.  Instead, it uses
488259e2ad7SPhilip Paeps    '[[noreturn]] static void usage(void);' as strict C23 requires.
489259e2ad7SPhilip Paeps    (Problem reported by Houge Langley.)
490259e2ad7SPhilip Paeps
491259e2ad7SPhilip Paeps    The code's functions now constrain their arguments with the C
492259e2ad7SPhilip Paeps    'restrict' keyword consistently with their documentation.
493259e2ad7SPhilip Paeps    This may allow future optimizations.
494259e2ad7SPhilip Paeps
495259e2ad7SPhilip Paeps    zdump again builds standalone with ckdadd and without setenv,
496259e2ad7SPhilip Paeps    fixing a bug introduced in 2022g.  (Problem reported by panic.)
497259e2ad7SPhilip Paeps
498259e2ad7SPhilip Paeps    leapseconds.awk can now process a leap seconds file that never
499259e2ad7SPhilip Paeps    expires; this might be useful if leap seconds are discontinued.
500259e2ad7SPhilip Paeps
501259e2ad7SPhilip Paeps  Changes to commentary
502259e2ad7SPhilip Paeps
503259e2ad7SPhilip Paeps    tz-link.html has a new section "Coordinating with governments and
504259e2ad7SPhilip Paeps    distributors".  (Thanks to Neil Fuller for some of the text.)
505259e2ad7SPhilip Paeps
506259e2ad7SPhilip Paeps    To improve tzselect diagnostics, zone1970.tab's comments column is
507259e2ad7SPhilip Paeps    now limited to countries that have multiple timezones.
508259e2ad7SPhilip Paeps
509e273650fSPhilip Paeps    Note that there are plans to discontinue leap seconds by 2035.
510259e2ad7SPhilip Paeps
511259e2ad7SPhilip Paeps
512cf1ad535SPhilip PaepsRelease 2022g - 2022-11-29 08:58:31 -0800
513cf1ad535SPhilip Paeps
514cf1ad535SPhilip Paeps  Briefly:
515cf1ad535SPhilip Paeps    The northern edge of Chihuahua changes to US timekeeping.
516cf1ad535SPhilip Paeps    Much of Greenland stops changing clocks after March 2023.
517cf1ad535SPhilip Paeps    Fix some pre-1996 timestamps in northern Canada.
518cf1ad535SPhilip Paeps    C89 is now deprecated; please use C99 or later.
519cf1ad535SPhilip Paeps    Portability fixes for AIX, libintl, MS-Windows, musl, z/OS
520cf1ad535SPhilip Paeps    In C code, use more C23 features if available.
521cf1ad535SPhilip Paeps    C23 timegm now supported by default
522cf1ad535SPhilip Paeps    Fixes for unlikely integer overflows
523cf1ad535SPhilip Paeps
524cf1ad535SPhilip Paeps  Changes to future timestamps
525cf1ad535SPhilip Paeps
526cf1ad535SPhilip Paeps    In the Mexican state of Chihuahua, the border strip near the US
527cf1ad535SPhilip Paeps    will change to agree with nearby US locations on 2022-11-30.
528cf1ad535SPhilip Paeps    The strip's western part, represented by Ciudad Juárez, switches
529cf1ad535SPhilip Paeps    from -06 all year to -07/-06 with US DST rules, like El Paso, TX.
530cf1ad535SPhilip Paeps    The eastern part, represented by Ojinaga, will observe US DST next
531cf1ad535SPhilip Paeps    year, like Presidio, TX.  (Thanks to Heitor David Pinto.)
532cf1ad535SPhilip Paeps    A new Zone America/Ciudad_Juarez splits from America/Ojinaga.
533cf1ad535SPhilip Paeps
534cf1ad535SPhilip Paeps    Much of Greenland, represented by America/Nuuk, stops observing
535cf1ad535SPhilip Paeps    winter time after March 2023, so its daylight saving time becomes
536cf1ad535SPhilip Paeps    standard time.  (Thanks to Jonas Nyrup and Jürgen Appel.)
537cf1ad535SPhilip Paeps
538cf1ad535SPhilip Paeps  Changes to past timestamps
539cf1ad535SPhilip Paeps
540cf1ad535SPhilip Paeps    Changes for pre-1996 northern Canada (thanks to Chris Walton):
541cf1ad535SPhilip Paeps
542cf1ad535SPhilip Paeps      Merge America/Iqaluit and America/Pangnirtung into the former,
543cf1ad535SPhilip Paeps      with a backward compatibility link for the latter name.
544cf1ad535SPhilip Paeps      There is no good evidence the two locations differ since 1970.
545cf1ad535SPhilip Paeps      This change affects pre-1996 America/Pangnirtung timestamps.
546cf1ad535SPhilip Paeps
547cf1ad535SPhilip Paeps      Cambridge Bay, Inuvik, Iqaluit, Rankin Inlet, Resolute and
548cf1ad535SPhilip Paeps      Yellowknife did not observe DST in 1965, and did observe DST
549cf1ad535SPhilip Paeps      from 1972 through 1979.
550cf1ad535SPhilip Paeps
551cf1ad535SPhilip Paeps      Whitehorse moved from -09 to -08 on 1966-02-27, not 1967-05-28.
552cf1ad535SPhilip Paeps
553cf1ad535SPhilip Paeps    Colombia's 1993 fallback was 02-06 24:00, not 04-04 00:00.
554cf1ad535SPhilip Paeps    (Thanks to Alois Treindl.)
555cf1ad535SPhilip Paeps
556cf1ad535SPhilip Paeps    Singapore's 1981-12-31 change was at 16:00 UTC (23:30 local time),
557cf1ad535SPhilip Paeps    not 24:00 local time.  (Thanks to Geoff Clare via Robert Elz.)
558cf1ad535SPhilip Paeps
559cf1ad535SPhilip Paeps  Changes to code
560cf1ad535SPhilip Paeps
561cf1ad535SPhilip Paeps    Although tzcode still works with C89, bugs found in recent routine
562cf1ad535SPhilip Paeps    maintenance indicate that bitrot has set in and that in practice
563cf1ad535SPhilip Paeps    C89 is no longer used to build tzcode.  As it is a maintenance
564cf1ad535SPhilip Paeps    burden, support for C89 is planned to be removed soon.  Instead,
565cf1ad535SPhilip Paeps    please use compilers compatible with C99, C11, C17, or C23.
566cf1ad535SPhilip Paeps
567cf1ad535SPhilip Paeps    timegm, which tzcode implemented in 1989, will finally be
568cf1ad535SPhilip Paeps    standardized 34 years later as part of C23, so timegm is now
569cf1ad535SPhilip Paeps    supported even if STD_INSPIRED is not defined.
570cf1ad535SPhilip Paeps
571cf1ad535SPhilip Paeps    Fix bug in zdump's tzalloc emulation on hosts that lack tm_zone.
572cf1ad535SPhilip Paeps    (Problem reported by Đoàn Trần Công Danh.)
573cf1ad535SPhilip Paeps
574cf1ad535SPhilip Paeps    Fix bug in zic on hosts where malloc(0) yields NULL on success.
575cf1ad535SPhilip Paeps    (Problem reported by Tim McBrayer for AIX 6.1.)
576cf1ad535SPhilip Paeps
577cf1ad535SPhilip Paeps    Fix zic configuration to avoid linkage failures on some platforms.
578cf1ad535SPhilip Paeps    (Problems reported by Gilmore Davidson and Igor Ivanov.)
579cf1ad535SPhilip Paeps
580cf1ad535SPhilip Paeps    Work around MS-Windows nmake incompatibility with POSIX.
581cf1ad535SPhilip Paeps    (Problem reported by Manuela Friedrich.)
582cf1ad535SPhilip Paeps
583cf1ad535SPhilip Paeps    Port mktime and strftime to debugging platforms where accessing
584cf1ad535SPhilip Paeps    uninitialized data has undefined behavior (strftime problem
585cf1ad535SPhilip Paeps    reported by Robert Elz).
586cf1ad535SPhilip Paeps
587cf1ad535SPhilip Paeps    Check more carefully for unlikely integer overflows, preferring
588cf1ad535SPhilip Paeps    C23 <stdckdint.h> to overflow checking by hand, as the latter has
589cf1ad535SPhilip Paeps    had obscure bugs.
590cf1ad535SPhilip Paeps
591cf1ad535SPhilip Paeps  Changes to build procedure
592cf1ad535SPhilip Paeps
593cf1ad535SPhilip Paeps    New Makefile rule check_mild that skips checking whether Link
594cf1ad535SPhilip Paeps    lines are in the file 'backward'.  (Inspired by a suggestion from
595cf1ad535SPhilip Paeps    Stephen Colebourne.)
596cf1ad535SPhilip Paeps
597cf1ad535SPhilip Paeps
5989142a2a3SPhilip PaepsRelease 2022f - 2022-10-28 18:04:57 -0700
5999142a2a3SPhilip Paeps
6009142a2a3SPhilip Paeps  Briefly:
6019142a2a3SPhilip Paeps    Mexico will no longer observe DST except near the US border.
6029142a2a3SPhilip Paeps    Chihuahua moves to year-round -06 on 2022-10-30.
6039142a2a3SPhilip Paeps    Fiji no longer observes DST.
6049142a2a3SPhilip Paeps    Move links to 'backward'.
6059142a2a3SPhilip Paeps    In vanguard form, GMT is now a Zone and Etc/GMT a link.
6069142a2a3SPhilip Paeps    zic now supports links to links, and vanguard form uses this.
6079142a2a3SPhilip Paeps    Simplify four Ontario zones.
6089142a2a3SPhilip Paeps    Fix a Y2438 bug when reading TZif data.
6099142a2a3SPhilip Paeps    Enable 64-bit time_t on 32-bit glibc platforms.
6109142a2a3SPhilip Paeps    Omit large-file support when no longer needed.
6119142a2a3SPhilip Paeps    In C code, use some C23 features if available.
6129142a2a3SPhilip Paeps    Remove no-longer-needed workaround for Qt bug 53071.
6139142a2a3SPhilip Paeps
614cf1ad535SPhilip Paeps  Changes to future timestamps
6159142a2a3SPhilip Paeps
6169142a2a3SPhilip Paeps    Mexico will no longer observe DST after 2022, except for areas
6179142a2a3SPhilip Paeps    near the US border that continue to observe US DST rules.
6189142a2a3SPhilip Paeps    On 2022-10-30 at 02:00 the Mexican state of Chihuahua moves
6199142a2a3SPhilip Paeps    from -07 (-06 with DST) to year-round -06, thus not changing
6209142a2a3SPhilip Paeps    its clocks that day.  The new law states that Chihuahua
6219142a2a3SPhilip Paeps    near the US border no longer observes US DST.
622cf1ad535SPhilip Paeps    (Thanks to gera for the heads-up about Chihuahua.)
6239142a2a3SPhilip Paeps
6249142a2a3SPhilip Paeps    Fiji will not observe DST in 2022/3.  (Thanks to Shalvin Narayan.)
6259142a2a3SPhilip Paeps    For now, assume DST is suspended indefinitely.
6269142a2a3SPhilip Paeps
6279142a2a3SPhilip Paeps  Changes to data
6289142a2a3SPhilip Paeps
6299142a2a3SPhilip Paeps    Move links to 'backward' to ease and simplify link maintenance.
6309142a2a3SPhilip Paeps    This affects generated data only if you use 'make BACKWARD='.
6319142a2a3SPhilip Paeps
6329142a2a3SPhilip Paeps    GMT is now a Zone and Etc/GMT a link instead of vice versa,
6339142a2a3SPhilip Paeps    as GMT is needed for leap second support whereas Etc/GMT is not.
6349142a2a3SPhilip Paeps    However, this change exposes a bug in TZUpdater 2.3.2 so it is
6359142a2a3SPhilip Paeps    present only in vanguard form for now.
6369142a2a3SPhilip Paeps
6379142a2a3SPhilip Paeps    Vanguard form now uses links to links, as zic now supports this.
6389142a2a3SPhilip Paeps
6399142a2a3SPhilip Paeps  Changes to past timestamps
6409142a2a3SPhilip Paeps
6419142a2a3SPhilip Paeps    Simplify four Ontario zones, as most of the post-1970 differences
6429142a2a3SPhilip Paeps    seem to have been imaginary.  (Problem reported by Chris Walton.)
6439142a2a3SPhilip Paeps    Move America/Nipigon, America/Rainy_River, and America/Thunder_Bay
6449142a2a3SPhilip Paeps    to 'backzone'; backward-compatibility links still work, albeit
6459142a2a3SPhilip Paeps    with some different timestamps before November 2005.
6469142a2a3SPhilip Paeps
6479142a2a3SPhilip Paeps  Changes to code
6489142a2a3SPhilip Paeps
6499142a2a3SPhilip Paeps    zic now supports links to links regardless of input line order.
6509142a2a3SPhilip Paeps    For example, if Australia/Sydney is a Zone, the lines
6519142a2a3SPhilip Paeps      Link Australia/Canberra Australia/ACT
6529142a2a3SPhilip Paeps      Link Australia/Sydney Australia/Canberra
6539142a2a3SPhilip Paeps    now work correctly, even though the shell commands
6549142a2a3SPhilip Paeps      ln Australia/Canberra Australia/ACT
6559142a2a3SPhilip Paeps      ln Australia/Sydney Australia/Canberra
6569142a2a3SPhilip Paeps    would fail because the first command attempts to use a link
6579142a2a3SPhilip Paeps    Australia/Canberra that does not exist until after the second
6589142a2a3SPhilip Paeps    command is executed.  Previously, zic had unspecified behavior if
6599142a2a3SPhilip Paeps    a Link line's target was another link, and zic often misbehaved if
6609142a2a3SPhilip Paeps    a Link line's target was a later Link line.
6619142a2a3SPhilip Paeps
6629142a2a3SPhilip Paeps    Fix line number in zic's diagnostic for a link to a link.
6639142a2a3SPhilip Paeps
6649142a2a3SPhilip Paeps    Fix a bug that caused localtime to mishandle timestamps starting
6659142a2a3SPhilip Paeps    in the year 2438 when reading data generated by 'zic -b fat' when
6669142a2a3SPhilip Paeps    distant-future DST transitions occur at times given in standard
6679142a2a3SPhilip Paeps    time or in UT, not the usual case of local time.  This occurs when
6689142a2a3SPhilip Paeps    the corresponding .zi Rule lines specify DST transitions with TO
6699142a2a3SPhilip Paeps    columns of 'max' and AT columns that end in 's' or 'u'.  The
6709142a2a3SPhilip Paeps    number 2438 comes from the 32-bit limit in the year 2038, plus the
6719142a2a3SPhilip Paeps    400-year Gregorian cycle.  (Problem reported by Bradley White.)
6729142a2a3SPhilip Paeps
6739142a2a3SPhilip Paeps    On glibc 2.34 and later, which optionally supports 64-bit time_t
6749142a2a3SPhilip Paeps    on platforms like x86 where time_t was traditionally 32 bits,
6759142a2a3SPhilip Paeps    default time_t to 64 instead of 32 bits.  This lets functions like
6769142a2a3SPhilip Paeps    localtime support timestamps after the year 2038, and fixes
6779142a2a3SPhilip Paeps    year-2038 problems in zic when accessing files dated after 2038.
6789142a2a3SPhilip Paeps    To continue to limit time_t to 32 bits on these platforms, use
6799142a2a3SPhilip Paeps    "make CFLAGS='-D_TIME_BITS=32'".
6809142a2a3SPhilip Paeps
6819142a2a3SPhilip Paeps    In C code, do not enable large-file support on platforms like AIX
6829142a2a3SPhilip Paeps    and macOS that no longer need it now that tzcode does not use
6839142a2a3SPhilip Paeps    off_t or related functions like 'stat'.  Large-file support is
6849142a2a3SPhilip Paeps    still enabled by default on GNU/Linux, as it is needed for 64-bit
6859142a2a3SPhilip Paeps    time_t support.
6869142a2a3SPhilip Paeps
6879142a2a3SPhilip Paeps    In C code, prefer C23 keywords to pre-C23 macros for alignof,
6889142a2a3SPhilip Paeps    bool, false, and true.  Also, use the following C23 features if
6899142a2a3SPhilip Paeps    available: __has_include, unreachable.
6909142a2a3SPhilip Paeps
6919142a2a3SPhilip Paeps    zic no longer works around Qt bug 53071, as the relevant Qt
6929142a2a3SPhilip Paeps    releases have been out of support since 2019.  This change affects
6939142a2a3SPhilip Paeps    only fat TZif files, as thin files never had the workaround.
6949142a2a3SPhilip Paeps
6959142a2a3SPhilip Paeps    zdump no longer modifies the environ vector when compiled on
6969142a2a3SPhilip Paeps    platforms lacking tm_zone or when compiled with -DUSE_LTZ=0.
6979142a2a3SPhilip Paeps    This avoid undefined behavior on POSIX platforms.
6989142a2a3SPhilip Paeps
6999142a2a3SPhilip Paeps
7005d56371cSPhilip PaepsRelease 2022e - 2022-10-11 11:13:02 -0700
7015d56371cSPhilip Paeps
7025d56371cSPhilip Paeps  Briefly:
7035d56371cSPhilip Paeps    Jordan and Syria switch from +02/+03 with DST to year-round +03.
7045d56371cSPhilip Paeps
7055d56371cSPhilip Paeps  Changes to future timestamps
7065d56371cSPhilip Paeps
7075d56371cSPhilip Paeps    Jordan and Syria are abandoning the DST regime and are changing to
7085d56371cSPhilip Paeps    permanent +03, so they will not fall back from +03 to +02 on
7095d56371cSPhilip Paeps    2022-10-28.  (Thanks to Steffen Thorsen and Issam Al-Zuwairi.)
7105d56371cSPhilip Paeps
7115d56371cSPhilip Paeps  Changes to past timestamps
7125d56371cSPhilip Paeps
7135d56371cSPhilip Paeps    On 1922-01-01 Tijuana adopted standard time at 00:00, not 01:00.
7145d56371cSPhilip Paeps
7155d56371cSPhilip Paeps  Changes to past time zone abbreviations and DST flags
7165d56371cSPhilip Paeps
7175d56371cSPhilip Paeps    The temporary advancement of clocks in central Mexico in summer
7185d56371cSPhilip Paeps    1931 is now treated as daylight saving time, instead of as two
7195d56371cSPhilip Paeps    changes to standard time.
7205d56371cSPhilip Paeps
7215d56371cSPhilip Paeps
7221576451aSPhilip PaepsRelease 2022d - 2022-09-23 12:02:57 -0700
7231576451aSPhilip Paeps
7241576451aSPhilip Paeps  Briefly:
7251576451aSPhilip Paeps    Palestine transitions are now Saturdays at 02:00.
7261576451aSPhilip Paeps    Simplify three Ukraine zones into one.
7271576451aSPhilip Paeps
7281576451aSPhilip Paeps  Changes to future timestamps
7291576451aSPhilip Paeps
7301576451aSPhilip Paeps    Palestine now springs forward and falls back at 02:00 on the
7311576451aSPhilip Paeps    first Saturday on or after March 24 and October 24, respectively.
7321576451aSPhilip Paeps    This means 2022 falls back 10-29 at 02:00, not 10-28 at 01:00.
7331576451aSPhilip Paeps    (Thanks to Heba Hamad.)
7341576451aSPhilip Paeps
7351576451aSPhilip Paeps  Changes to past timestamps
7361576451aSPhilip Paeps
7371576451aSPhilip Paeps    Simplify three Ukraine zones to one, since the post-1970
7381576451aSPhilip Paeps    differences seem to have been imaginary.  Move Europe/Uzhgorod and
7391576451aSPhilip Paeps    Europe/Zaporozhye to 'backzone'; backward-compatibility links
7401576451aSPhilip Paeps    still work, albeit with different timestamps before October 1991.
7411576451aSPhilip Paeps
7421576451aSPhilip Paeps
7435f33eb72SPhilip PaepsRelease 2022c - 2022-08-15 17:47:18 -0700
7445f33eb72SPhilip Paeps
7455f33eb72SPhilip Paeps  Briefly:
7465f33eb72SPhilip Paeps    Work around awk bug in FreeBSD, macOS, etc.
7475f33eb72SPhilip Paeps    Improve tzselect on intercontinental Zones.
7485f33eb72SPhilip Paeps
7495f33eb72SPhilip Paeps  Changes to code
7505f33eb72SPhilip Paeps
7515f33eb72SPhilip Paeps    Work around a bug in onetrueawk that broke commands like
7525f33eb72SPhilip Paeps    'make traditional_tarballs' on FreeBSD, macOS, etc.
7535f33eb72SPhilip Paeps    (Problem reported by Deborah Goldsmith.)
7545f33eb72SPhilip Paeps
7555f33eb72SPhilip Paeps    Add code to tzselect that uses experimental structured comments in
7565f33eb72SPhilip Paeps    zone1970.tab to clarify whether Zones like Africa/Abidjan and
7575f33eb72SPhilip Paeps    Europe/Istanbul cross continent or ocean boundaries.
7585f33eb72SPhilip Paeps    (Inspired by a problem reported by Peter Krefting.)
7595f33eb72SPhilip Paeps
7605f33eb72SPhilip Paeps    Fix bug with 'zic -d /a/b/c' when /a is unwritable but the
7615f33eb72SPhilip Paeps    directory /a/b already exists.
7625f33eb72SPhilip Paeps
7635f33eb72SPhilip Paeps    Remove zoneinfo2tdf.pl, as it was unused and triggered false
7645f33eb72SPhilip Paeps    malware alarms on some email servers.
7655f33eb72SPhilip Paeps
7665f33eb72SPhilip Paeps
7679f9fc6bbSPhilip PaepsRelease 2022b - 2022-08-10 15:38:32 -0700
7689f9fc6bbSPhilip Paeps
7699f9fc6bbSPhilip Paeps  Briefly:
7709f9fc6bbSPhilip Paeps    Chile's DST is delayed by a week in September 2022.
7719f9fc6bbSPhilip Paeps    Iran no longer observes DST after 2022.
7729f9fc6bbSPhilip Paeps    Rename Europe/Kiev to Europe/Kyiv.
7739f9fc6bbSPhilip Paeps    New zic -R option
7749f9fc6bbSPhilip Paeps    Vanguard form now uses %z.
7759f9fc6bbSPhilip Paeps    Finish moving duplicate-since-1970 zones to 'backzone'.
7769f9fc6bbSPhilip Paeps    New build option PACKRATLIST
7779f9fc6bbSPhilip Paeps    New tailored_tarballs target, replacing rearguard_tarballs
7789f9fc6bbSPhilip Paeps
7799f9fc6bbSPhilip Paeps  Changes to future timestamps
7809f9fc6bbSPhilip Paeps
7819f9fc6bbSPhilip Paeps    Chile's 2022 DST start is delayed from September 4 to September 11.
7829f9fc6bbSPhilip Paeps    (Thanks to Juan Correa.)
7839f9fc6bbSPhilip Paeps
7849f9fc6bbSPhilip Paeps    Iran plans to stop observing DST permanently, after it falls back
7859f9fc6bbSPhilip Paeps    on 2022-09-21.  (Thanks to Ali Mirjamali.)
7869f9fc6bbSPhilip Paeps
7879f9fc6bbSPhilip Paeps  Changes to past timestamps
7889f9fc6bbSPhilip Paeps
7899f9fc6bbSPhilip Paeps    Finish moving to 'backzone' the location-based zones whose
7909f9fc6bbSPhilip Paeps    timestamps since 1970 are duplicates; adjust links accordingly.
7919f9fc6bbSPhilip Paeps    This change ordinarily affects only pre-1970 timestamps, and with
7929f9fc6bbSPhilip Paeps    the new PACKRATLIST option it does not affect any timestamps.
7939f9fc6bbSPhilip Paeps    In this round the affected zones are Antarctica/Vostok,
7949f9fc6bbSPhilip Paeps    Asia/Brunei, Asia/Kuala_Lumpur, Atlantic/Reykjavik,
7959f9fc6bbSPhilip Paeps    Europe/Amsterdam, Europe/Copenhagen, Europe/Luxembourg,
7969f9fc6bbSPhilip Paeps    Europe/Monaco, Europe/Oslo, Europe/Stockholm, Indian/Christmas,
7979f9fc6bbSPhilip Paeps    Indian/Cocos, Indian/Kerguelen, Indian/Mahe, Indian/Reunion,
7989f9fc6bbSPhilip Paeps    Pacific/Chuuk, Pacific/Funafuti, Pacific/Majuro, Pacific/Pohnpei,
7999f9fc6bbSPhilip Paeps    Pacific/Wake and Pacific/Wallis, and the affected links are
8009f9fc6bbSPhilip Paeps    Arctic/Longyearbyen, Atlantic/Jan_Mayen, Iceland, Pacific/Ponape,
8019f9fc6bbSPhilip Paeps    Pacific/Truk, and Pacific/Yap.
8029f9fc6bbSPhilip Paeps
8039f9fc6bbSPhilip Paeps    From fall 1994 through fall 1995, Shanks wrote that Crimea's
8049f9fc6bbSPhilip Paeps    DST transitions were at 02:00 standard time, not at 00:00.
8059f9fc6bbSPhilip Paeps    (Thanks to Michael Deckers.)
8069f9fc6bbSPhilip Paeps
8079f9fc6bbSPhilip Paeps    Iran adopted standard time in 1935, not 1946.  In 1977 it observed
8089f9fc6bbSPhilip Paeps    DST from 03-21 23:00 to 10-20 24:00; its 1978 transitions were on
8099f9fc6bbSPhilip Paeps    03-24 and 08-05, not 03-20 and 10-20; and its spring 1979
8109f9fc6bbSPhilip Paeps    transition was on 05-27, not 03-21.
8119f9fc6bbSPhilip Paeps    (Thanks to Roozbeh Pournader and Francis Santoni.)
8129f9fc6bbSPhilip Paeps
8139f9fc6bbSPhilip Paeps    Chile's observance of -04 from 1946-08-29 through 1947-03-31 was
8149f9fc6bbSPhilip Paeps    considered DST, not standard time.  Santiago and environs had moved
8159f9fc6bbSPhilip Paeps    their clocks back to rejoin the rest of mainland Chile; put this
8169f9fc6bbSPhilip Paeps    change at the end of 1946-08-28.  (Thanks to Michael Deckers.)
8179f9fc6bbSPhilip Paeps
8189f9fc6bbSPhilip Paeps    Some old, small clock transitions have been removed, as people at
8199f9fc6bbSPhilip Paeps    the time did not change their clocks.  This affects Asia/Hong_Kong
8209f9fc6bbSPhilip Paeps    in 1904, Asia/Ho_Chi_Minh in 1906, and Europe/Dublin in 1880.
8219f9fc6bbSPhilip Paeps
8229f9fc6bbSPhilip Paeps  Changes to zone name
8239f9fc6bbSPhilip Paeps
8249f9fc6bbSPhilip Paeps    Rename Europe/Kiev to Europe/Kyiv, as "Kyiv" is more common in
8259f9fc6bbSPhilip Paeps    English now.  Spelling of other names in Ukraine has not yet
8269f9fc6bbSPhilip Paeps    demonstrably changed in common English practice so for now these
8279f9fc6bbSPhilip Paeps    names retain old spellings, as in other countries (e.g.,
8289f9fc6bbSPhilip Paeps    Europe/Prague not "Praha", and Europe/Sofia not "Sofiya").
8299f9fc6bbSPhilip Paeps
8309f9fc6bbSPhilip Paeps  Changes to code
8319f9fc6bbSPhilip Paeps
8329f9fc6bbSPhilip Paeps    zic has a new option '-R @N' to output explicit transitions < N.
8339f9fc6bbSPhilip Paeps    (Need suggested by Almaz Mingaleev.)
8349f9fc6bbSPhilip Paeps
8359f9fc6bbSPhilip Paeps    'zic -r @N' no longer outputs bad data when N < first transition.
8369f9fc6bbSPhilip Paeps    (Problem introduced in 2021d and reported by Peter Krefting.)
8379f9fc6bbSPhilip Paeps
8389f9fc6bbSPhilip Paeps    zic now checks its input for NUL bytes and unterminated lines, and
8399f9fc6bbSPhilip Paeps    now supports input line lengths up to 2048 (not 512) bytes.
8409f9fc6bbSPhilip Paeps
8419f9fc6bbSPhilip Paeps    gmtime and related code now use the abbreviation "UTC" not "GMT".
8429f9fc6bbSPhilip Paeps    POSIX is being revised to require this.
8439f9fc6bbSPhilip Paeps
8449f9fc6bbSPhilip Paeps    When tzset and related functions set vestigial static variables
8459f9fc6bbSPhilip Paeps    like tzname, they now prefer specified timestamps to unspecified ones.
8469f9fc6bbSPhilip Paeps    (Problem reported by Almaz Mingaleev.)
8479f9fc6bbSPhilip Paeps
8489f9fc6bbSPhilip Paeps    zic no longer complains "can't determine time zone abbreviation to
8499f9fc6bbSPhilip Paeps    use just after until time" when a transition to a new standard
8505f33eb72SPhilip Paeps    time occurs simultaneously with the first DST fallback transition.
8519f9fc6bbSPhilip Paeps
8529f9fc6bbSPhilip Paeps  Changes to build procedure
8539f9fc6bbSPhilip Paeps
8549f9fc6bbSPhilip Paeps    Source data in vanguard form now uses the %z notation, introduced
8559f9fc6bbSPhilip Paeps    in release 2015f.  For example, for America/Sao_Paulo vanguard
8569f9fc6bbSPhilip Paeps    form contains the zone continuation line "-3:00 Brazil %z", which
8579f9fc6bbSPhilip Paeps    is simpler and more reliable than the line "-3:00 Brazil -03/-02"
8589f9fc6bbSPhilip Paeps    used in main and rearguard forms.  The plan is for the main form
8599f9fc6bbSPhilip Paeps    to use %z eventually; in the meantime maintainers of zi parsers
8609f9fc6bbSPhilip Paeps    are encouraged to test the parsers on vanguard.zi.
8619f9fc6bbSPhilip Paeps
8629f9fc6bbSPhilip Paeps    The Makefile has a new PACKRATLIST option to select a subset of
8639f9fc6bbSPhilip Paeps    'backzone'.  For example, 'make PACKRATDATA=backzone
8649f9fc6bbSPhilip Paeps    PACKRATLIST=zone.tab' now generates TZif files identical to those
8659f9fc6bbSPhilip Paeps    of the global-tz project.
8669f9fc6bbSPhilip Paeps
8679f9fc6bbSPhilip Paeps    The Makefile has a new tailored_tarballs target for generating
8689f9fc6bbSPhilip Paeps    special-purpose tarballs.  It generalizes and replaces the
8699f9fc6bbSPhilip Paeps    rearguard_tarballs target and related targets and macros, which
8709f9fc6bbSPhilip Paeps    are now obsolescent.
8719f9fc6bbSPhilip Paeps
8729f9fc6bbSPhilip Paeps    'make install' now defaults LOCALTIME to Factory not GMT,
8739f9fc6bbSPhilip Paeps    which means the default abbreviation is now "-00" not "GMT".
8749f9fc6bbSPhilip Paeps
8759f9fc6bbSPhilip Paeps    Remove the posix_packrat target, marked obsolescent in 2016a.
8769f9fc6bbSPhilip Paeps
8779f9fc6bbSPhilip Paeps
8788ea5af2bSPhilip PaepsRelease 2022a - 2022-03-15 23:02:01 -0700
8798ea5af2bSPhilip Paeps
8808ea5af2bSPhilip Paeps  Briefly:
8818ea5af2bSPhilip Paeps    Palestine will spring forward on 2022-03-27, not -03-26.
8828ea5af2bSPhilip Paeps    zdump -v now outputs better failure indications.
8838ea5af2bSPhilip Paeps    Bug fixes for code that reads corrupted TZif data.
8848ea5af2bSPhilip Paeps
8858ea5af2bSPhilip Paeps  Changes to future timestamps
8868ea5af2bSPhilip Paeps
8878ea5af2bSPhilip Paeps    Palestine will spring forward on 2022-03-27, not 2022-03-26.
8888ea5af2bSPhilip Paeps    (Thanks to Heba Hamad.)  Predict future transitions for first
8898ea5af2bSPhilip Paeps    Sunday >= March 25.  Additionally, predict fallbacks to be the first
8908ea5af2bSPhilip Paeps    Friday on or after October 23, not October's last Friday, to be more
8918ea5af2bSPhilip Paeps    consistent with recent practice.  The first differing fallback
8928ea5af2bSPhilip Paeps    prediction is on 2025-10-24, not 2025-10-31.
8938ea5af2bSPhilip Paeps
8948ea5af2bSPhilip Paeps  Changes to past timestamps
8958ea5af2bSPhilip Paeps
8968ea5af2bSPhilip Paeps    From 1992 through spring 1996, Ukraine's DST transitions were at
8978ea5af2bSPhilip Paeps    02:00 standard time, not at 01:00 UTC.  (Thanks to Alois Treindl.)
8988ea5af2bSPhilip Paeps
8998ea5af2bSPhilip Paeps    Chile's Santiago Mean Time and its LMT precursor have been adjusted
9008ea5af2bSPhilip Paeps    eastward by 1 second to align with past and present law.
9018ea5af2bSPhilip Paeps
9028ea5af2bSPhilip Paeps  Changes to commentary
9038ea5af2bSPhilip Paeps
9048ea5af2bSPhilip Paeps    Add several references for Chile's 1946/1947 transitions, some of
9058ea5af2bSPhilip Paeps    which only affected portions of the country.
9068ea5af2bSPhilip Paeps
9078ea5af2bSPhilip Paeps  Changes to code
9088ea5af2bSPhilip Paeps
9098ea5af2bSPhilip Paeps    Fix bug when mktime gets confused by truncated TZif files with
9108ea5af2bSPhilip Paeps    unspecified local time.  (Problem reported by Almaz Mingaleev.)
9118ea5af2bSPhilip Paeps
9128ea5af2bSPhilip Paeps    Fix bug when 32-bit time_t code reads malformed 64-bit TZif data.
9138ea5af2bSPhilip Paeps    (Problem reported by Christos Zoulas.)
9148ea5af2bSPhilip Paeps
9158ea5af2bSPhilip Paeps    When reading a version 2 or later TZif file, the TZif reader now
9168ea5af2bSPhilip Paeps    validates the version 1 header and data block only enough to skip
9178ea5af2bSPhilip Paeps    over them, as recommended by RFC 8536 section 4.  Also, the TZif
9188ea5af2bSPhilip Paeps    reader no longer mistakenly attempts to parse a version 1 TZIf
9198ea5af2bSPhilip Paeps    file header as a TZ string.
9208ea5af2bSPhilip Paeps
9218ea5af2bSPhilip Paeps    zdump -v now outputs "(localtime failed)" and "(gmtime failed)"
9228ea5af2bSPhilip Paeps    when local time and UT cannot be determined for a timestamp.
9238ea5af2bSPhilip Paeps
9248ea5af2bSPhilip Paeps  Changes to build procedure
9258ea5af2bSPhilip Paeps
9268ea5af2bSPhilip Paeps    Distribution tarballs now use standard POSIX.1-1988 ustar format
9278ea5af2bSPhilip Paeps    instead of GNU format.  Although the formats are almost identical
9288ea5af2bSPhilip Paeps    for these tarballs, ustar headers' magic fields contain "ustar"
9298ea5af2bSPhilip Paeps    instead of "ustar ", and their version fields contain "00" instead
9308ea5af2bSPhilip Paeps    of " ".  The two formats are planned to diverge more significantly
9318ea5af2bSPhilip Paeps    for tzdb releases after 2242-03-16 12:56:31 UTC, when the ustar
9328ea5af2bSPhilip Paeps    format becomes obsolete and the tarballs switch to pax format, an
9338ea5af2bSPhilip Paeps    extension of ustar.  For details about these formats, please see
9348ea5af2bSPhilip Paeps    "pax - portable archive interchange", IEEE Std 1003.1-2017,
9358ea5af2bSPhilip Paeps    <https://pubs.opengroup.org/onlinepubs/9699919799/utilities/pax.html#tag_20_92_13>.
9368ea5af2bSPhilip Paeps
9378ea5af2bSPhilip Paeps
938b02df232SPhilip PaepsRelease 2021e - 2021-10-21 18:41:00 -0700
939b02df232SPhilip Paeps
940b02df232SPhilip Paeps  Changes to future timestamps
941b02df232SPhilip Paeps
942b02df232SPhilip Paeps    Palestine will fall back 10-29 (not 10-30) at 01:00.
943b02df232SPhilip Paeps    (Thanks to P Chan and Heba Hemad.)
944b02df232SPhilip Paeps
945b02df232SPhilip Paeps
9466b7d3b4dSPhilip PaepsRelease 2021d - 2021-10-15 13:48:18 -0700
9476b7d3b4dSPhilip Paeps
9486b7d3b4dSPhilip Paeps  Briefly:
9496b7d3b4dSPhilip Paeps    Fiji suspends DST for the 2021/2022 season.
9506b7d3b4dSPhilip Paeps    'zic -r' marks unspecified timestamps with "-00".
9516b7d3b4dSPhilip Paeps
9526b7d3b4dSPhilip Paeps  Changes to future timestamps
9536b7d3b4dSPhilip Paeps
9546b7d3b4dSPhilip Paeps    Fiji will suspend observance of DST for the 2021/2022 season.
9556b7d3b4dSPhilip Paeps    Assume for now that it will return next year.  (Thanks to Jashneel
9566b7d3b4dSPhilip Paeps    Kumar and P Chan.)
9576b7d3b4dSPhilip Paeps
9586b7d3b4dSPhilip Paeps  Changes to code
9596b7d3b4dSPhilip Paeps
9606b7d3b4dSPhilip Paeps    'zic -r' now uses "-00" time zone abbreviations for intervals
9616b7d3b4dSPhilip Paeps    with UT offsets that are unspecified due to -r truncation.
9626b7d3b4dSPhilip Paeps    This implements a change in draft Internet RFC 8536bis.
9636b7d3b4dSPhilip Paeps
9646b7d3b4dSPhilip Paeps
96593d120dbSPhilip PaepsRelease 2021c - 2021-10-01 14:21:49 -0700
96693d120dbSPhilip Paeps
96793d120dbSPhilip Paeps  Briefly:
96893d120dbSPhilip Paeps    Revert most 2021b changes to 'backward'.
96993d120dbSPhilip Paeps    Fix 'zic -b fat' bug in pre-1970 32-bit data.
97093d120dbSPhilip Paeps    Fix two Link line typos.
97193d120dbSPhilip Paeps    Distribute SECURITY file.
97293d120dbSPhilip Paeps
97393d120dbSPhilip Paeps    This release is intended as a bugfix release, to fix compatibility
97493d120dbSPhilip Paeps    problems and typos reported since 2021b was released.
97593d120dbSPhilip Paeps
97693d120dbSPhilip Paeps  Changes to Link directives
97793d120dbSPhilip Paeps
97893d120dbSPhilip Paeps    Revert almost all of 2021b's changes to the 'backward' file,
97993d120dbSPhilip Paeps    by moving Link directives back to where they were in 2021a.
98093d120dbSPhilip Paeps    Although 'zic' doesn't care which source file contains a Link
98193d120dbSPhilip Paeps    directive, some downstream uses ran into trouble with the move.
98293d120dbSPhilip Paeps    (Problem reported by Stephen Colebourne for Joda-Time.)
98393d120dbSPhilip Paeps
98493d120dbSPhilip Paeps    Fix typo that linked Atlantic/Jan_Mayen to the wrong location
98593d120dbSPhilip Paeps    (problem reported by Chris Walton).
98693d120dbSPhilip Paeps
98793d120dbSPhilip Paeps    Fix 'backzone' typo that linked America/Virgin to the wrong
98893d120dbSPhilip Paeps    location (problem reported by Michael Deckers).
98993d120dbSPhilip Paeps
99093d120dbSPhilip Paeps  Changes to code
99193d120dbSPhilip Paeps
99293d120dbSPhilip Paeps    Fix a bug in 'zic -b fat' that caused old timestamps to be
99393d120dbSPhilip Paeps    mishandled in 32-bit-only readers (problem reported by Daniel
99493d120dbSPhilip Paeps    Fischer).
99593d120dbSPhilip Paeps
99693d120dbSPhilip Paeps  Changes to documentation
99793d120dbSPhilip Paeps
99893d120dbSPhilip Paeps    Distribute the SECURITY file (problem reported by Andreas Radke).
99993d120dbSPhilip Paeps
100093d120dbSPhilip Paeps
100194c2d487SPhilip PaepsRelease 2021b - 2021-09-24 16:23:00 -0700
100294c2d487SPhilip Paeps
100394c2d487SPhilip Paeps  Briefly:
100494c2d487SPhilip Paeps    Jordan now starts DST on February's last Thursday.
100594c2d487SPhilip Paeps    Samoa no longer observes DST.
100694c2d487SPhilip Paeps    Merge more location-based Zones whose timestamps agree since 1970.
100794c2d487SPhilip Paeps    Move some backward-compatibility links to 'backward'.
100894c2d487SPhilip Paeps    Rename Pacific/Enderbury to Pacific/Kanton.
100994c2d487SPhilip Paeps    Correct many pre-1993 transitions in Malawi, Portugal, etc.
101094c2d487SPhilip Paeps    zic now creates each output file or link atomically.
101194c2d487SPhilip Paeps    zic -L no longer omits the POSIX TZ string in its output.
101294c2d487SPhilip Paeps    zic fixes for truncation and leap second table expiration.
101394c2d487SPhilip Paeps    zic now follows POSIX for TZ strings using all-year DST.
101494c2d487SPhilip Paeps    Fix some localtime crashes and bugs in obscure cases.
101594c2d487SPhilip Paeps    zdump -v now outputs more-useful boundary cases.
101694c2d487SPhilip Paeps    tzfile.5 better matches a draft successor to RFC 8536.
101794c2d487SPhilip Paeps    A new file SECURITY.
101894c2d487SPhilip Paeps
101994c2d487SPhilip Paeps    This release is prompted by recent announcements by Jordan and Samoa.
102094c2d487SPhilip Paeps    It incorporates many other changes that had accumulated since 2021a.
102194c2d487SPhilip Paeps    However, it omits most proposed changes that merged all Zones
102294c2d487SPhilip Paeps    agreeing since 1970, as concerns were raised about doing too many of
102394c2d487SPhilip Paeps    these changes at once.  It does keeps some of these changes in the
102494c2d487SPhilip Paeps    interest of making tzdb more equitable one step at a time; see
102594c2d487SPhilip Paeps    "Merge more location-based Zones" below.
102694c2d487SPhilip Paeps
102794c2d487SPhilip Paeps  Changes to future timestamps
102894c2d487SPhilip Paeps
102994c2d487SPhilip Paeps    Jordan now starts DST on February's last Thursday.
103094c2d487SPhilip Paeps    (Thanks to Steffen Thorsen.)
103194c2d487SPhilip Paeps
103294c2d487SPhilip Paeps    Samoa no longer observes DST.  (Thanks to Geoffrey D. Bennett.)
103394c2d487SPhilip Paeps
103494c2d487SPhilip Paeps  Changes to zone name
103594c2d487SPhilip Paeps
103694c2d487SPhilip Paeps    Rename Pacific/Enderbury to Pacific/Kanton.  When we added
103794c2d487SPhilip Paeps    Enderbury in 1993, we did not know that it is uninhabited and that
103894c2d487SPhilip Paeps    Kanton (population two dozen) is the only inhabited location in
10399f9fc6bbSPhilip Paeps    that timezone.  The old name is now a backward-compatibility link.
104094c2d487SPhilip Paeps
104194c2d487SPhilip Paeps  Changes to past timestamps
104294c2d487SPhilip Paeps
104394c2d487SPhilip Paeps    Correct many pre-1993 transitions, fixing entries originally
104494c2d487SPhilip Paeps    derived from Shanks, Whitman, and Mundell.  The fixes include:
104594c2d487SPhilip Paeps      - Barbados: standard time was introduced in 1911, not 1932; and
104694c2d487SPhilip Paeps	DST was observed in 1942-1944
104794c2d487SPhilip Paeps      - Cook Islands: In 1899 they switched from east to west of GMT,
104894c2d487SPhilip Paeps	celebrating Christmas for two days.  They (and Niue) switched
104994c2d487SPhilip Paeps	to standard time in 1952, not 1901.
105094c2d487SPhilip Paeps      - Guyana: corrected LMT for Georgetown; the introduction of
105194c2d487SPhilip Paeps	standard time in 1911, not 1915; and corrections to 1975 and
105294c2d487SPhilip Paeps	1992 transitions
105394c2d487SPhilip Paeps      - Kanton: uninhabited before 1937-08-31
105494c2d487SPhilip Paeps      - Niue: only observed -11:20 from 1952 through 1964, then went to
105594c2d487SPhilip Paeps        -11 instead of -11:30
105694c2d487SPhilip Paeps      - Portugal: DST was observed in 1950
105794c2d487SPhilip Paeps      - Tonga: corrected LMT; the introduction of standard time in 1945,
105894c2d487SPhilip Paeps        not 1901; and corrections to the transition from +12:20 to +13
105994c2d487SPhilip Paeps        in 1961, not 1941
106094c2d487SPhilip Paeps    Additional fixes to entries in the 'backzone' file include:
106194c2d487SPhilip Paeps      - Enderbury: inhabited only 1860/1885 and 1938-03-06/1942-02-09
106294c2d487SPhilip Paeps      - The Gambia: 1933 and 1942 transitions
106394c2d487SPhilip Paeps      - Malawi: several 1911 through 1925 transitions
106494c2d487SPhilip Paeps      - Sierra Leone: several 1913 through 1941 transitions, and DST
106594c2d487SPhilip Paeps	was NOT observed in 1957 through 1962
106694c2d487SPhilip Paeps    (Thanks to P Chan, Michael Deckers, Alexander Krivenyshev and
106794c2d487SPhilip Paeps    Alois Treindl.)
106894c2d487SPhilip Paeps
106994c2d487SPhilip Paeps    Merge more location-based Zones whose timestamps agree since 1970,
107094c2d487SPhilip Paeps    as pre-1970 timestamps are out of scope.  This is part of a
107194c2d487SPhilip Paeps    process that has been ongoing since 2013.  This does not affect
107294c2d487SPhilip Paeps    post-1970 timestamps, and timezone historians who build with 'make
107394c2d487SPhilip Paeps    PACKRATDATA=backzone' should see no changes to pre-1970 timestamps.
107494c2d487SPhilip Paeps    When merging, keep the most-populous location's data, and move
107594c2d487SPhilip Paeps    data for other locations to 'backzone' with a backward
107694c2d487SPhilip Paeps    link in 'backward'.  For example, move America/Creston data to
107794c2d487SPhilip Paeps    'backzone' with a link in 'backward' from America/Phoenix because
107894c2d487SPhilip Paeps    the two timezones' timestamps agree since 1970; this change
107994c2d487SPhilip Paeps    affects some pre-1968 timestamps in America/Creston because
108094c2d487SPhilip Paeps    Creston and Phoenix disagreed before 1968.  The affected Zones
108194c2d487SPhilip Paeps    are Africa/Accra, America/Atikokan, America/Blanc-Sablon,
108294c2d487SPhilip Paeps    America/Creston, America/Curacao, America/Nassau,
108394c2d487SPhilip Paeps    America/Port_of_Spain, Antarctica/DumontDUrville, and
108494c2d487SPhilip Paeps    Antarctica/Syowa.
108594c2d487SPhilip Paeps
108694c2d487SPhilip Paeps  Changes to maintenance procedure
108794c2d487SPhilip Paeps
108894c2d487SPhilip Paeps    The new file SECURITY covers how to report security-related bugs.
108994c2d487SPhilip Paeps
109094c2d487SPhilip Paeps    Several backward-compatibility links have been moved to the
109194c2d487SPhilip Paeps    'backward' file.  These links, which range from Africa/Addis_Ababa
109294c2d487SPhilip Paeps    to Pacific/Saipan, are only for compatibility with now-obsolete
109394c2d487SPhilip Paeps    guidelines suggesting an entry for every ISO 3166 code.
109494c2d487SPhilip Paeps    The intercontinental convenience links Asia/Istanbul and
109594c2d487SPhilip Paeps    Europe/Nicosia have also been moved to 'backward'.
109694c2d487SPhilip Paeps
109794c2d487SPhilip Paeps  Changes to code
109894c2d487SPhilip Paeps
109994c2d487SPhilip Paeps    zic now creates each output file or link atomically,
110094c2d487SPhilip Paeps    possibly by creating a temporary file and then renaming it.
110194c2d487SPhilip Paeps    This avoids races where a TZ setting would temporarily stop
110294c2d487SPhilip Paeps    working while zic was installing a replacement file or link.
110394c2d487SPhilip Paeps
110494c2d487SPhilip Paeps    zic -L no longer omits the POSIX TZ string in its output.
110594c2d487SPhilip Paeps    Starting with 2020a, zic -L truncated its output according to the
110694c2d487SPhilip Paeps    "Expires" directive or "#expires" comment in the leapseconds file.
110794c2d487SPhilip Paeps    The resulting TZif files omitted daylight saving transitions after
1108259e2ad7SPhilip Paeps    the leap second table expired, which led to far less accurate
110994c2d487SPhilip Paeps    predictions of times after the expiry.  Although future timestamps
111094c2d487SPhilip Paeps    cannot be converted accurately in the presence of leap seconds, it
111194c2d487SPhilip Paeps    is more accurate to convert near-future timestamps with a few
111294c2d487SPhilip Paeps    seconds error than with an hour error, so zic -L no longer
111394c2d487SPhilip Paeps    truncates output in this way.
111494c2d487SPhilip Paeps
111594c2d487SPhilip Paeps    Instead, when zic -L is given the "Expires" directive, it now
111694c2d487SPhilip Paeps    outputs the expiration by appending a no-change entry to the leap
111794c2d487SPhilip Paeps    second table.  Although this should work well with most TZif
111894c2d487SPhilip Paeps    readers, it does not conform to Internet RFC 8536 and some pickier
111994c2d487SPhilip Paeps    clients (including tzdb 2017c through 2021a) reject it, so
112094c2d487SPhilip Paeps    "Expires" directives are currently disabled by default.  To enable
112194c2d487SPhilip Paeps    them, set the EXPIRES_LINE Makefile variable.  If a TZif file uses
112294c2d487SPhilip Paeps    this new feature it is marked with a new TZif version number 4,
112394c2d487SPhilip Paeps    a format intended to be documented in a successor to RFC 8536.
1124eebb9c2cSPhilip Paeps    The old-format "#expires" comments are now treated solely as
1125eebb9c2cSPhilip Paeps    comments and have no effect on the TZif files.
112694c2d487SPhilip Paeps
112794c2d487SPhilip Paeps    zic -L LEAPFILE -r @LO no longer generates an invalid TZif file
112894c2d487SPhilip Paeps    that omits leap second information for the range LO..B when LO
112994c2d487SPhilip Paeps    falls between two leap seconds A and B.  Instead, it generates a
1130259e2ad7SPhilip Paeps    TZif version 4 file that represents the previously missing
113194c2d487SPhilip Paeps    information.
113294c2d487SPhilip Paeps
113394c2d487SPhilip Paeps    The TZif reader now allows the leap second table to begin with a
113494c2d487SPhilip Paeps    correction other than -1 or +1, and to contain adjacent
113594c2d487SPhilip Paeps    transitions with equal corrections.  This supports TZif version 4.
113694c2d487SPhilip Paeps
113794c2d487SPhilip Paeps    The TZif reader now lets leap seconds occur less than 28 days
113894c2d487SPhilip Paeps    apart.  This supports possible future TZif extensions.
113994c2d487SPhilip Paeps
114094c2d487SPhilip Paeps    Fix bug that caused 'localtime' etc. to crash when TZ was
114194c2d487SPhilip Paeps    set to a all-year DST string like "EST5EDT4,0/0,J365/25" that does
114294c2d487SPhilip Paeps    not conform to POSIX but does conform to Internet RFC 8536.
114394c2d487SPhilip Paeps
114494c2d487SPhilip Paeps    Fix another bug that caused 'localtime' etc. to crash when TZ was
114594c2d487SPhilip Paeps    set to a POSIX-conforming but unusual TZ string like
114694c2d487SPhilip Paeps    "EST5EDT4,0/0,J365/0", where almost all the year is DST.
114794c2d487SPhilip Paeps
114894c2d487SPhilip Paeps    Fix yet another bug that caused 'localtime' etc. to mishandle slim
114994c2d487SPhilip Paeps    TZif files containing leap seconds after the last explicit
115094c2d487SPhilip Paeps    transition in the table, or when handling far-future timestamps
115194c2d487SPhilip Paeps    in slim TZif files lacking leap seconds.
115294c2d487SPhilip Paeps
115394c2d487SPhilip Paeps    Fix localtime misbehavior involving positive leap seconds.
115494c2d487SPhilip Paeps    This change affects only behavior for "right" system time,
115594c2d487SPhilip Paeps    which contains leap seconds, and only if the UT offset is
115694c2d487SPhilip Paeps    not a multiple of 60 seconds when a positive leap second occurs.
115794c2d487SPhilip Paeps    (No such timezone exists in tzdb, luckily.)  Without the fix,
115894c2d487SPhilip Paeps    the timestamp was ambiguous during a positive leap second.
115994c2d487SPhilip Paeps    With the fix, any seconds occurring after a positive leap second
116094c2d487SPhilip Paeps    and within the same localtime minute are counted through 60, not
116194c2d487SPhilip Paeps    through 59; their UT offset (tm_gmtoff) is the same as before.
116294c2d487SPhilip Paeps    Here is how the fix affects timestamps in a timezone with UT
116394c2d487SPhilip Paeps    offset +01:23:45 (5025 seconds) and with a positive leap second at
116494c2d487SPhilip Paeps    1972-06-30 23:59:60 UTC (78796800):
116594c2d487SPhilip Paeps
116694c2d487SPhilip Paeps	time_t    without the fix      with the fix
116794c2d487SPhilip Paeps	78796800  1972-07-01 01:23:45  1972-07-01 01:23:45 (leap second)
116894c2d487SPhilip Paeps	78796801  1972-07-01 01:23:45  1972-07-01 01:23:46
116994c2d487SPhilip Paeps	...
117094c2d487SPhilip Paeps	78796815  1972-07-01 01:23:59  1972-07-01 01:23:60
117194c2d487SPhilip Paeps	78796816  1972-07-01 01:24:00  1972-07-01 01:24:00
117294c2d487SPhilip Paeps
117394c2d487SPhilip Paeps    Fix an unlikely bug that caused 'localtime' etc. to misbehave if
117494c2d487SPhilip Paeps    civil time changes a few seconds before time_t wraps around, when
117594c2d487SPhilip Paeps    leap seconds are enabled.
117694c2d487SPhilip Paeps
117794c2d487SPhilip Paeps    Fix bug in zic -r; in some cases, the dummy time type after the
117894c2d487SPhilip Paeps    last time transition disagreed with the TZ string, contrary to
117994c2d487SPhilip Paeps    Internet RFC 8563 section 3.3.
118094c2d487SPhilip Paeps
118194c2d487SPhilip Paeps    Fix a bug with 'zic -r @X' when X is a negative leap second that
118294c2d487SPhilip Paeps    has a nonnegative correction.  Without the fix, the output file
118394c2d487SPhilip Paeps    was truncated so that X appeared to be a positive leap second.
1184259e2ad7SPhilip Paeps    Fix a similar, even less likely bug when truncating at a positive
118594c2d487SPhilip Paeps    leap second that has a nonpositive correction.
118694c2d487SPhilip Paeps
118794c2d487SPhilip Paeps    zic -r now reports an error if given rolling leap seconds, as this
118894c2d487SPhilip Paeps    usage has never generally worked and is evidently unused.
118994c2d487SPhilip Paeps
119094c2d487SPhilip Paeps    zic now generates a POSIX-conforming TZ string for TZif files
119194c2d487SPhilip Paeps    where all-year DST is predicted for the indefinite future.
119294c2d487SPhilip Paeps    For example, for all-year Eastern Daylight Time, zic now generates
119394c2d487SPhilip Paeps    "XXX3EDT4,0/0,J365/23" where it previously generated
119494c2d487SPhilip Paeps    "EST5EDT,0/0,J365/25" or "".  (Thanks to Michael Deckers for
119594c2d487SPhilip Paeps    noting the possibility of POSIX conformance.)
119694c2d487SPhilip Paeps
119794c2d487SPhilip Paeps    zic.c no longer requires sys/wait.h (thanks to spazmodius for
119894c2d487SPhilip Paeps    noting it wasn't needed).
119994c2d487SPhilip Paeps
120094c2d487SPhilip Paeps    When reading slim TZif files, zdump no longer mishandles leap
120194c2d487SPhilip Paeps    seconds on the rare platforms where time_t counts leap seconds,
120294c2d487SPhilip Paeps    fixing a bug introduced in 2014g.
120394c2d487SPhilip Paeps
120494c2d487SPhilip Paeps    zdump -v now outputs timestamps at boundaries of what localtime
1205259e2ad7SPhilip Paeps    and gmtime can represent, instead of the less useful timestamps
120694c2d487SPhilip Paeps    one day after the minimum and one day before the maximum.
120794c2d487SPhilip Paeps    (Thanks to Arthur David Olson for prototype code, and to Manuela
120894c2d487SPhilip Paeps    Friedrich for debugging help.)
120994c2d487SPhilip Paeps
121094c2d487SPhilip Paeps    zdump's -c and -t options are now consistently inclusive for the
121194c2d487SPhilip Paeps    lower time bound and exclusive for the upper.  Formerly they were
121294c2d487SPhilip Paeps    inconsistent.  (Confusion noted by Martin Burnicki.)
121394c2d487SPhilip Paeps
121494c2d487SPhilip Paeps  Changes to build procedure
121594c2d487SPhilip Paeps
121694c2d487SPhilip Paeps    You can now compile with -DHAVE_MALLOC_ERRNO=0 to port to
121794c2d487SPhilip Paeps    non-POSIX hosts where malloc doesn't set errno.
121894c2d487SPhilip Paeps    (Problem reported by Jan Engelhardt.)
121994c2d487SPhilip Paeps
122094c2d487SPhilip Paeps  Changes to documentation
122194c2d487SPhilip Paeps
122294c2d487SPhilip Paeps    tzfile.5 better matches a draft successor to RFC 8536
122394c2d487SPhilip Paeps    <https://datatracker.ietf.org/doc/draft-murchison-rfc8536bis/01/>.
122494c2d487SPhilip Paeps
122594c2d487SPhilip Paeps
12268c5bef2eSPhilip PaepsRelease 2021a - 2021-01-24 10:54:57 -0800
12278c5bef2eSPhilip Paeps
12288c5bef2eSPhilip Paeps  Changes to future timestamps
12298c5bef2eSPhilip Paeps
12308c5bef2eSPhilip Paeps    South Sudan changes from +03 to +02 on 2021-02-01 at 00:00.
12318c5bef2eSPhilip Paeps    (Thanks to Steffen Thorsen.)
12328c5bef2eSPhilip Paeps
12338c5bef2eSPhilip Paeps
1234e35a01eeSPhilip PaepsRelease 2020f - 2020-12-29 00:17:46 -0800
1235e35a01eeSPhilip Paeps
1236e35a01eeSPhilip Paeps  Change to build procedure
1237e35a01eeSPhilip Paeps
1238e35a01eeSPhilip Paeps    'make rearguard_tarballs' no longer generates a bad rearguard.zi,
1239e35a01eeSPhilip Paeps    fixing a 2020e bug.  (Problem reported by Deborah Goldsmith.)
1240e35a01eeSPhilip Paeps
1241e35a01eeSPhilip Paeps
1242dc505d53SPhilip PaepsRelease 2020e - 2020-12-22 15:14:34 -0800
1243dc505d53SPhilip Paeps
1244dc505d53SPhilip Paeps  Briefly:
1245dc505d53SPhilip Paeps    Volgograd switches to Moscow time on 2020-12-27 at 02:00.
1246dc505d53SPhilip Paeps
1247dc505d53SPhilip Paeps  Changes to future timestamps
1248dc505d53SPhilip Paeps
1249dc505d53SPhilip Paeps    Volgograd changes time zone from +04 to +03 on 2020-12-27 at 02:00.
1250dc505d53SPhilip Paeps    (Thanks to Alexander Krivenyshev and Stepan Golosunov.)
1251dc505d53SPhilip Paeps
1252dc505d53SPhilip Paeps  Changes to past timestamps
1253dc505d53SPhilip Paeps
1254dc505d53SPhilip Paeps    Correct many pre-1986 transitions, fixing entries originally
1255dc505d53SPhilip Paeps    derived from Shanks.  The fixes include:
1256dc505d53SPhilip Paeps      - Australia: several 1917 through 1971 transitions
125794c2d487SPhilip Paeps      - The Bahamas: several 1941 through 1945 transitions
1258dc505d53SPhilip Paeps      - Bermuda: several 1917 through 1956 transitions
1259dc505d53SPhilip Paeps      - Belize: several 1942 through 1968 transitions
1260dc505d53SPhilip Paeps      - Ghana: several 1915 through 1956 transitions
1261dc505d53SPhilip Paeps      - Israel and Palestine: several 1940 through 1985 transitions
1262dc505d53SPhilip Paeps      - Kenya and adjacent: several 1908 through 1960 transitions
1263dc505d53SPhilip Paeps      - Nigeria and adjacent: correcting LMT in Lagos, and several 1905
1264dc505d53SPhilip Paeps        through 1919 transitions
1265dc505d53SPhilip Paeps      - Seychelles: the introduction of standard time in 1907, not 1906
1266dc505d53SPhilip Paeps      - Vanuatu: DST in 1973-1974, and a corrected 1984 transition
1267dc505d53SPhilip Paeps    (Thanks to P Chan.)
1268dc505d53SPhilip Paeps
1269dc505d53SPhilip Paeps    Because of the Australia change, Australia/Currie (King Island) is
1270dc505d53SPhilip Paeps    no longer needed, as it is identical to Australia/Hobart for all
1271dc505d53SPhilip Paeps    timestamps since 1970 and was therefore created by mistake.
1272dc505d53SPhilip Paeps    Australia/Currie has been moved to the 'backward' file and its
1273dc505d53SPhilip Paeps    corrected data moved to the 'backzone' file.
1274dc505d53SPhilip Paeps
1275dc505d53SPhilip Paeps  Changes to past time zone abbreviations and DST flags
1276dc505d53SPhilip Paeps
1277dc505d53SPhilip Paeps    To better match legislation in Turks and Caicos, the 2015 shift to
1278dc505d53SPhilip Paeps    year-round observance of -04 is now modeled as AST throughout before
1279dc505d53SPhilip Paeps    returning to Eastern Time with US DST in 2018, rather than as
1280dc505d53SPhilip Paeps    maintaining EDT until 2015-11-01.  (Thanks to P Chan.)
1281dc505d53SPhilip Paeps
1282dc505d53SPhilip Paeps  Changes to documentation
1283dc505d53SPhilip Paeps
1284dc505d53SPhilip Paeps    The zic man page now documents zic's coalescing of transitions
1285dc505d53SPhilip Paeps    when a zone falls back just before DST springs forward.
1286dc505d53SPhilip Paeps
1287dc505d53SPhilip Paeps
12883611c2d8SPhilip PaepsRelease 2020d - 2020-10-21 11:24:13 -0700
12893611c2d8SPhilip Paeps
12903611c2d8SPhilip Paeps  Briefly:
12913611c2d8SPhilip Paeps    Palestine ends DST earlier than predicted, on 2020-10-24.
12923611c2d8SPhilip Paeps
12933611c2d8SPhilip Paeps  Changes to past and future timestamps
12943611c2d8SPhilip Paeps
12953611c2d8SPhilip Paeps    Palestine ends DST on 2020-10-24 at 01:00, instead of 2020-10-31
12963611c2d8SPhilip Paeps    as previously predicted (thanks to Sharef Mustafa.)  Its
12973611c2d8SPhilip Paeps    2019-10-26 fall-back was at 00:00, not 01:00 (thanks to Steffen
12983611c2d8SPhilip Paeps    Thorsen.)  Its 2015-10-23 transition was at 01:00 not 00:00, and
12993611c2d8SPhilip Paeps    its spring 2020 transition was on March 28 at 00:00, not March 27
13003611c2d8SPhilip Paeps    (thanks to Pierre Cashon.)  This affects Asia/Gaza and
13013611c2d8SPhilip Paeps    Asia/Hebron.  Assume future spring and fall transitions will be on
13023611c2d8SPhilip Paeps    the Saturday preceding the last Sunday of March and October,
13033611c2d8SPhilip Paeps    respectively.
13043611c2d8SPhilip Paeps
13053611c2d8SPhilip Paeps
1306e7e2d659SPhilip PaepsRelease 2020c - 2020-10-16 11:15:53 -0700
1307e7e2d659SPhilip Paeps
1308e7e2d659SPhilip Paeps  Briefly:
1309e7e2d659SPhilip Paeps    Fiji starts DST later than usual, on 2020-12-20.
1310e7e2d659SPhilip Paeps
1311e7e2d659SPhilip Paeps  Changes to future timestamps
1312e7e2d659SPhilip Paeps
1313e7e2d659SPhilip Paeps    Fiji will start DST on 2020-12-20, instead of 2020-11-08 as
1314e7e2d659SPhilip Paeps    previously predicted.  DST will still end on 2021-01-17.
1315e7e2d659SPhilip Paeps    (Thanks to Raymond Kumar and Alan Mintz.)  Assume for now that
1316e7e2d659SPhilip Paeps    the later-than-usual start date is a one-time departure from the
1317e7e2d659SPhilip Paeps    recent pattern.
1318e7e2d659SPhilip Paeps
1319e7e2d659SPhilip Paeps  Changes to build procedure
1320e7e2d659SPhilip Paeps
1321e7e2d659SPhilip Paeps    Rearguard tarballs now contain an empty file pacificnew.
1322e7e2d659SPhilip Paeps    Some older downstream software expects this file to exist.
1323e7e2d659SPhilip Paeps    (Problem reported by Mike Cullinan.)
1324e7e2d659SPhilip Paeps
1325e7e2d659SPhilip Paeps
132612a899b6SPhilip PaepsRelease 2020b - 2020-10-06 18:35:04 -0700
132712a899b6SPhilip Paeps
132812a899b6SPhilip Paeps  Briefly:
132912a899b6SPhilip Paeps    Revised predictions for Morocco's changes starting in 2023.
133012a899b6SPhilip Paeps    Canada's Yukon changes to -07 on 2020-11-01, not 2020-03-08.
133112a899b6SPhilip Paeps    Macquarie Island has stayed in sync with Tasmania since 2011.
133212a899b6SPhilip Paeps    Casey, Antarctica is at +08 in winter and +11 in summer.
133312a899b6SPhilip Paeps    zic no longer supports -y, nor the TYPE field of Rules.
133412a899b6SPhilip Paeps
133512a899b6SPhilip Paeps  Changes to future timestamps
133612a899b6SPhilip Paeps
133712a899b6SPhilip Paeps    Morocco's spring-forward after Ramadan is now predicted to occur
133812a899b6SPhilip Paeps    no sooner than two days after Ramadan, instead of one day.
133912a899b6SPhilip Paeps    (Thanks to Milamber.)  The first altered prediction is for 2023,
134012a899b6SPhilip Paeps    now predicted to spring-forward on April 30 instead of April 23.
134112a899b6SPhilip Paeps
134212a899b6SPhilip Paeps  Changes to past and future timestamps
134312a899b6SPhilip Paeps
134412a899b6SPhilip Paeps   Casey Station, Antarctica has been using +08 in winter and +11 in
134512a899b6SPhilip Paeps   summer since 2018.  The most recent transition from +08 to +11 was
134612a899b6SPhilip Paeps   2020-10-04 00:01.  Also, Macquarie Island has been staying in
134712a899b6SPhilip Paeps   sync with Tasmania since 2011.  (Thanks to Steffen Thorsen.)
134812a899b6SPhilip Paeps
134912a899b6SPhilip Paeps  Changes to past and future time zone abbreviations and DST flags
135012a899b6SPhilip Paeps
135112a899b6SPhilip Paeps    Canada's Yukon, represented by America/Whitehorse and
135212a899b6SPhilip Paeps    America/Dawson, changes its time zone rules from -08/-07 to
135312a899b6SPhilip Paeps    permanent -07 on 2020-11-01, not on 2020-03-08 as 2020a had it.
135412a899b6SPhilip Paeps    This change affects only the time zone abbreviation (MST vs PDT)
135512a899b6SPhilip Paeps    and daylight saving flag for the period between the two dates.
135612a899b6SPhilip Paeps    (Thanks to Andrew G. Smith.)
135712a899b6SPhilip Paeps
135812a899b6SPhilip Paeps  Changes to past timestamps
135912a899b6SPhilip Paeps
136012a899b6SPhilip Paeps    Correct several transitions for Hungary for 1918/1983.
136112a899b6SPhilip Paeps    For example, the 1983-09-25 fall-back was at 01:00, not 03:00.
136212a899b6SPhilip Paeps    (Thanks to Géza Nyáry.)  Also, the 1890 transition to standard
136312a899b6SPhilip Paeps    time was on 11-01, not 10-01 (thanks to Michael Deckers).
136412a899b6SPhilip Paeps
136512a899b6SPhilip Paeps    The 1891 French transition was on March 16, not March 15.  The
136612a899b6SPhilip Paeps    1911-03-11 French transition was at midnight, not a minute later.
136712a899b6SPhilip Paeps    Monaco's transitions were on 1892-06-01 and 1911-03-29, not
136812a899b6SPhilip Paeps    1891-03-15 and 1911-03-11.  (Thanks to Michael Deckers.)
136912a899b6SPhilip Paeps
137012a899b6SPhilip Paeps  Changes to code
137112a899b6SPhilip Paeps
137212a899b6SPhilip Paeps    Support for zic's long-obsolete '-y YEARISTYPE' option has been
137312a899b6SPhilip Paeps    removed and, with it, so has support for the TYPE field in Rule
137412a899b6SPhilip Paeps    lines, which is now reserved for compatibility with earlier zic.
137512a899b6SPhilip Paeps    These features were previously deprecated in release 2015f.
137612a899b6SPhilip Paeps    (Thanks to Tim Parenti.)
137712a899b6SPhilip Paeps
137812a899b6SPhilip Paeps    zic now defaults to '-b slim' instead of to '-b fat'.
137912a899b6SPhilip Paeps
138012a899b6SPhilip Paeps    zic's new '-l -' and '-p -' options uninstall any existing
138112a899b6SPhilip Paeps    localtime and posixrules files, respectively.
138212a899b6SPhilip Paeps
138312a899b6SPhilip Paeps    The undocumented and ineffective tzsetwall function has been
138412a899b6SPhilip Paeps    removed.
138512a899b6SPhilip Paeps
138612a899b6SPhilip Paeps  Changes to build procedure
138712a899b6SPhilip Paeps
138812a899b6SPhilip Paeps    The Makefile now defaults POSIXRULES to '-', so the posixrules
138912a899b6SPhilip Paeps    feature (obsolete as of 2019b) is no longer installed by default.
139012a899b6SPhilip Paeps
139112a899b6SPhilip Paeps  Changes to documentation and commentary
139212a899b6SPhilip Paeps
139312a899b6SPhilip Paeps    The long-obsolete files pacificnew, systemv, and yearistype.sh have
139412a899b6SPhilip Paeps    been removed from the distribution.  (Thanks to Tim Parenti.)
139512a899b6SPhilip Paeps
139612a899b6SPhilip Paeps
1397dd5f96c4SPhilip PaepsRelease 2020a - 2020-04-23 16:03:47 -0700
1398dd5f96c4SPhilip Paeps
1399dd5f96c4SPhilip Paeps  Briefly:
1400dd5f96c4SPhilip Paeps    Morocco springs forward on 2020-05-31, not 2020-05-24.
1401dd5f96c4SPhilip Paeps    Canada's Yukon advanced to -07 year-round on 2020-03-08.
1402dd5f96c4SPhilip Paeps    America/Nuuk renamed from America/Godthab.
1403dd5f96c4SPhilip Paeps    zic now supports expiration dates for leap second lists.
1404dd5f96c4SPhilip Paeps
1405dd5f96c4SPhilip Paeps  Changes to future timestamps
1406dd5f96c4SPhilip Paeps
1407dd5f96c4SPhilip Paeps    Morocco's second spring-forward transition in 2020 will be May 31,
1408dd5f96c4SPhilip Paeps    not May 24 as predicted earlier.  (Thanks to Semlali Naoufal.)
1409dd5f96c4SPhilip Paeps    Adjust future-year predictions to use the first Sunday after the
1410dd5f96c4SPhilip Paeps    day after Ramadan, not the first Sunday after Ramadan.
1411dd5f96c4SPhilip Paeps
1412dd5f96c4SPhilip Paeps    Canada's Yukon, represented by America/Whitehorse and
1413dd5f96c4SPhilip Paeps    America/Dawson, advanced to -07 year-round, beginning with its
1414dd5f96c4SPhilip Paeps    spring-forward transition on 2020-03-08, and will not fall back on
1415dd5f96c4SPhilip Paeps    2020-11-01.  Although a government press release calls this
1416dd5f96c4SPhilip Paeps    "permanent Pacific Daylight Saving Time", we prefer MST for
1417dd5f96c4SPhilip Paeps    consistency with nearby Dawson Creek, Creston, and Fort Nelson.
1418dd5f96c4SPhilip Paeps    (Thanks to Tim Parenti.)
1419dd5f96c4SPhilip Paeps
1420dd5f96c4SPhilip Paeps  Changes to past timestamps
1421dd5f96c4SPhilip Paeps
1422dd5f96c4SPhilip Paeps    Shanghai observed DST in 1919.  (Thanks to Phake Nick.)
1423dd5f96c4SPhilip Paeps
1424dd5f96c4SPhilip Paeps  Changes to timezone identifiers
1425dd5f96c4SPhilip Paeps
1426dd5f96c4SPhilip Paeps    To reflect current usage in English better, America/Godthab has
1427dd5f96c4SPhilip Paeps    been renamed to America/Nuuk.  A backwards-compatibility link
1428dd5f96c4SPhilip Paeps    remains for the old name.
1429dd5f96c4SPhilip Paeps
1430dd5f96c4SPhilip Paeps  Changes to code
1431dd5f96c4SPhilip Paeps
1432dd5f96c4SPhilip Paeps    localtime.c no longer mishandles timestamps after the last
1433dd5f96c4SPhilip Paeps    transition in a TZif file with leap seconds and with daylight
1434dd5f96c4SPhilip Paeps    saving time transitions projected into the indefinite future.
1435dd5f96c4SPhilip Paeps    For example, with TZ='America/Los_Angeles' with leap seconds,
1436dd5f96c4SPhilip Paeps    zdump formerly reported a DST transition on 2038-03-14
1437dd5f96c4SPhilip Paeps    from 01:59:32.999... to 02:59:33 instead of the correct transition
1438dd5f96c4SPhilip Paeps    from 01:59:59.999... to 03:00:00.
1439dd5f96c4SPhilip Paeps
1440dd5f96c4SPhilip Paeps    zic -L now supports an Expires line in the leapseconds file, and
1441dd5f96c4SPhilip Paeps    truncates the TZif output accordingly.  This propagates leap
1442dd5f96c4SPhilip Paeps    second expiration information into the TZif file, and avoids the
1443dd5f96c4SPhilip Paeps    abovementioned localtime.c bug as well as similar bugs present in
1444dd5f96c4SPhilip Paeps    many client implementations.  If no Expires line is present, zic
1445dd5f96c4SPhilip Paeps    -L instead truncates the TZif output based on the #expires comment
1446dd5f96c4SPhilip Paeps    present in leapseconds files distributed by tzdb 2018f and later;
1447dd5f96c4SPhilip Paeps    however, this usage is obsolescent.  For now, the distributed
1448dd5f96c4SPhilip Paeps    leapseconds file has an Expires line that is commented out, so
1449dd5f96c4SPhilip Paeps    that the file can be fed to older versions of zic which ignore the
1450dd5f96c4SPhilip Paeps    commented-out line.  Future tzdb distributions are planned to
1451dd5f96c4SPhilip Paeps    contain a leapseconds file with an Expires line.
1452dd5f96c4SPhilip Paeps
1453dd5f96c4SPhilip Paeps    The configuration macros HAVE_TZNAME and USG_COMPAT should now be
1454dd5f96c4SPhilip Paeps    set to 1 if the system library supports the feature, and 2 if not.
1455dd5f96c4SPhilip Paeps    As before, these macros are nonzero if tzcode should support the
1456dd5f96c4SPhilip Paeps    feature, zero otherwise.
1457dd5f96c4SPhilip Paeps
1458dd5f96c4SPhilip Paeps    The configuration macro ALTZONE now has the same values with the
1459dd5f96c4SPhilip Paeps    same meaning as HAVE_TZNAME and USG_COMPAT.
1460dd5f96c4SPhilip Paeps
1461dd5f96c4SPhilip Paeps    The code's defense against CRLF in leap-seconds.list is now
1462dd5f96c4SPhilip Paeps    portable to POSIX awk.  (Problem reported by Deborah Goldsmith.)
1463dd5f96c4SPhilip Paeps
1464dd5f96c4SPhilip Paeps    Although the undocumented tzsetwall function is not changed in
1465dd5f96c4SPhilip Paeps    this release, it is now deprecated in preparation for removal in
1466dd5f96c4SPhilip Paeps    future releases.  Due to POSIX requirements, tzsetwall has not
1467dd5f96c4SPhilip Paeps    worked for some time.  Any code that uses it should instead use
1468dd5f96c4SPhilip Paeps    tzalloc(NULL) or, if portability trumps thread-safety, should
1469dd5f96c4SPhilip Paeps    unset the TZ environment variable.
1470dd5f96c4SPhilip Paeps
1471dd5f96c4SPhilip Paeps  Changes to commentary
1472dd5f96c4SPhilip Paeps
1473dd5f96c4SPhilip Paeps    The Îles-de-la-Madeleine and the Listuguj reserve are noted as
1474dd5f96c4SPhilip Paeps    following America/Halifax, and comments about Yukon's "south" and
1475dd5f96c4SPhilip Paeps    "north" have been corrected to say "east" and "west".  (Thanks to
1476dd5f96c4SPhilip Paeps    Jeffery Nichols.)
1477dd5f96c4SPhilip Paeps
1478dd5f96c4SPhilip Paeps
1479798c0c0bSPhilip PaepsRelease 2019c - 2019-09-11 08:59:48 -0700
1480798c0c0bSPhilip Paeps
1481798c0c0bSPhilip Paeps  Briefly:
1482798c0c0bSPhilip Paeps    Fiji observes DST from 2019-11-10 to 2020-01-12.
1483798c0c0bSPhilip Paeps    Norfolk Island starts observing Australian-style DST.
1484798c0c0bSPhilip Paeps
1485798c0c0bSPhilip Paeps  Changes to future timestamps
1486798c0c0bSPhilip Paeps
1487798c0c0bSPhilip Paeps    Fiji's next DST transitions will be 2019-11-10 and 2020-01-12
1488798c0c0bSPhilip Paeps    instead of 2019-11-03 and 2020-01-19.  (Thanks to Raymond Kumar.)
1489798c0c0bSPhilip Paeps    Adjust future guesses accordingly.
1490798c0c0bSPhilip Paeps
1491798c0c0bSPhilip Paeps    Norfolk Island will observe Australian-style DST starting in
1492798c0c0bSPhilip Paeps    spring 2019.  The first transition is on 2019-10-06.  (Thanks to
1493798c0c0bSPhilip Paeps    Kyle Czech and Michael Deckers.)
1494798c0c0bSPhilip Paeps
1495798c0c0bSPhilip Paeps  Changes to past timestamps
1496798c0c0bSPhilip Paeps
1497798c0c0bSPhilip Paeps    Many corrections to time in Turkey from 1940 through 1985.
1498798c0c0bSPhilip Paeps    (Thanks to Oya Vulaş via Alois Treindl, and to Kıvanç Yazan.)
1499798c0c0bSPhilip Paeps
1500798c0c0bSPhilip Paeps    The Norfolk Island 1975-03-02 transition was at 02:00 standard
1501798c0c0bSPhilip Paeps    time, not 02:00 DST.  (Thanks to Michael Deckers.)
1502798c0c0bSPhilip Paeps
1503798c0c0bSPhilip Paeps    South Korea observed DST from 1948 through 1951.  Although this
1504798c0c0bSPhilip Paeps    info was supposed to appear in release 2014j, a typo inadvertently
1505798c0c0bSPhilip Paeps    suppressed the change.  (Thanks to Alois Treindl.)
1506798c0c0bSPhilip Paeps
1507798c0c0bSPhilip Paeps    Detroit observed DST in 1967 and 1968 following the US DST rules,
1508798c0c0bSPhilip Paeps    except that its 1967 DST began on June 14 at 00:01.  (Thanks to
1509798c0c0bSPhilip Paeps    Alois Treindl for pointing out that the old data entries were
1510798c0c0bSPhilip Paeps    probably wrong.)
1511798c0c0bSPhilip Paeps
1512798c0c0bSPhilip Paeps    Fix several errors in pre-1970 transitions in Perry County, IN.
15136b7d3b4dSPhilip Paeps    (Thanks to Alois Treindl for pointing out the 1967/9 errors.)
1514798c0c0bSPhilip Paeps
1515798c0c0bSPhilip Paeps    Edmonton did not observe DST in 1967 or 1969.  In 1946 Vancouver
1516798c0c0bSPhilip Paeps    ended DST on 09-29 not 10-13, and Vienna ended DST on 10-07 not
1517798c0c0bSPhilip Paeps    10-06.  In 1945 Königsberg (now Kaliningrad) switched from +01/+02
1518798c0c0bSPhilip Paeps    to +02/+03 on 04-10 not 01-01, and its +02/+03 is abbreviated
15196b7d3b4dSPhilip Paeps    EET/EEST, not CET/CEST.  (Thanks to Alois Treindl.)  In 1946
1520798c0c0bSPhilip Paeps    Königsberg switched to +03 on 04-07 not 01-01.
1521798c0c0bSPhilip Paeps
1522798c0c0bSPhilip Paeps    In 1946 Louisville switched from CST to CDT on 04-28 at 00:01, not
1523798c0c0bSPhilip Paeps    01-01 at 00:00.  (Thanks to Alois Treindl and Michael Deckers.)
1524798c0c0bSPhilip Paeps    Also, it switched from CST to CDT on 1950-04-30, not 1947-04-27.
1525798c0c0bSPhilip Paeps
1526798c0c0bSPhilip Paeps    The 1892-05-01 transition in Brussels was at 00:17:30, not at noon.
1527798c0c0bSPhilip Paeps    (Thanks to Michael Deckers.)
1528798c0c0bSPhilip Paeps
1529798c0c0bSPhilip Paeps  Changes to past time zone abbreviations and DST flags
1530798c0c0bSPhilip Paeps
1531798c0c0bSPhilip Paeps    Hong Kong Winter Time, observed from 1941-10-01 to 1941-12-25,
1532798c0c0bSPhilip Paeps    is now flagged as DST and is abbreviated HKWT not HKT.
1533798c0c0bSPhilip Paeps
1534798c0c0bSPhilip Paeps  Changes to code
1535798c0c0bSPhilip Paeps
1536798c0c0bSPhilip Paeps    leapseconds.awk now relies only on its input data, rather than
1537798c0c0bSPhilip Paeps    also relying on its comments.  (Inspired by code from Dennis
1538798c0c0bSPhilip Paeps    Ferguson and Chris Woodbury.)
1539798c0c0bSPhilip Paeps
1540798c0c0bSPhilip Paeps    The code now defends against CRLFs in leap-seconds.list.
1541798c0c0bSPhilip Paeps    (Thanks to Brian Inglis and Chris Woodbury.)
1542798c0c0bSPhilip Paeps
1543798c0c0bSPhilip Paeps  Changes to documentation and commentary
1544798c0c0bSPhilip Paeps
1545798c0c0bSPhilip Paeps    theory.html discusses leap seconds.  (Thanks to Steve Summit.)
1546798c0c0bSPhilip Paeps
1547798c0c0bSPhilip Paeps    Nashville's newspapers dueled about the time of day in the 1950s.
1548798c0c0bSPhilip Paeps    (Thanks to John Seigenthaler.)
1549798c0c0bSPhilip Paeps
1550798c0c0bSPhilip Paeps    Liechtenstein observed Swiss DST in 1941/2.
1551798c0c0bSPhilip Paeps    (Thanks to Alois Treindl.)
1552798c0c0bSPhilip Paeps
1553798c0c0bSPhilip Paeps
15542865ab3fSPhilip PaepsRelease 2019b - 2019-07-01 00:09:53 -0700
15552865ab3fSPhilip Paeps
15562865ab3fSPhilip Paeps  Briefly:
15572865ab3fSPhilip Paeps    Brazil no longer observes DST.
15582865ab3fSPhilip Paeps    'zic -b slim' outputs smaller TZif files; please try it out.
15592865ab3fSPhilip Paeps    Palestine's 2019 spring-forward transition was on 03-29, not 03-30.
15602865ab3fSPhilip Paeps
15612865ab3fSPhilip Paeps  Changes to future timestamps
15622865ab3fSPhilip Paeps
15632865ab3fSPhilip Paeps    Brazil has canceled DST and will stay on standard time indefinitely.
15642865ab3fSPhilip Paeps    (Thanks to Steffen Thorsen, Marcus Diniz, and Daniel Soares de
15652865ab3fSPhilip Paeps    Oliveira.)
15662865ab3fSPhilip Paeps
15672865ab3fSPhilip Paeps    Predictions for Morocco now go through 2087 instead of 2037, to
15682865ab3fSPhilip Paeps    work around a problem on newlib when using TZif files output by
15692865ab3fSPhilip Paeps    zic 2019a or earlier.  (Problem reported by David Gauchard.)
15702865ab3fSPhilip Paeps
15712865ab3fSPhilip Paeps  Changes to past and future timestamps
15722865ab3fSPhilip Paeps
15732865ab3fSPhilip Paeps    Palestine's 2019 spring transition was 03-29 at 00:00, not 03-30
15742865ab3fSPhilip Paeps    at 01:00.  (Thanks to Sharef Mustafa and Even Scharning.)  Guess
15752865ab3fSPhilip Paeps    future transitions to be March's last Friday at 00:00.
15762865ab3fSPhilip Paeps
15772865ab3fSPhilip Paeps  Changes to past timestamps
15782865ab3fSPhilip Paeps
15792865ab3fSPhilip Paeps    Hong Kong's 1941-06-15 spring-forward transition was at 03:00, not
15802865ab3fSPhilip Paeps    03:30.  Its 1945 transition from JST to HKT was on 11-18 at 02:00,
15812865ab3fSPhilip Paeps    not 09-15 at 00:00.  In 1946 its spring-forward transition was on
15822865ab3fSPhilip Paeps    04-21 at 00:00, not the previous day at 03:30.  From 1946 through
15832865ab3fSPhilip Paeps    1952 its fall-back transitions occurred at 04:30, not at 03:30.
15842865ab3fSPhilip Paeps    In 1947 its fall-back transition was on 11-30, not 12-30.
15852865ab3fSPhilip Paeps    (Thanks to P Chan.)
15862865ab3fSPhilip Paeps
15872865ab3fSPhilip Paeps  Changes to past time zone abbreviations
15882865ab3fSPhilip Paeps
15892865ab3fSPhilip Paeps    Italy's 1866 transition to Rome Mean Time was on December 12, not
15902865ab3fSPhilip Paeps    September 22.  This affects only the time zone abbreviation for
15912865ab3fSPhilip Paeps    Europe/Rome between those dates.  (Thanks to Stephen Trainor and
15922865ab3fSPhilip Paeps    Luigi Rosa.)
15932865ab3fSPhilip Paeps
15942865ab3fSPhilip Paeps  Changes affecting metadata only
15952865ab3fSPhilip Paeps
15962865ab3fSPhilip Paeps    Add info about the Crimea situation in zone1970.tab and zone.tab.
15972865ab3fSPhilip Paeps    (Problem reported by Serhii Demediuk.)
15982865ab3fSPhilip Paeps
15992865ab3fSPhilip Paeps  Changes to code
16002865ab3fSPhilip Paeps
16012865ab3fSPhilip Paeps    zic's new -b option supports a way to control data bloat and to
16022865ab3fSPhilip Paeps    test for year-2038 bugs in software that reads TZif files.
16032865ab3fSPhilip Paeps    'zic -b fat' and 'zic -b slim' generate larger and smaller output;
16042865ab3fSPhilip Paeps    for example, changing from fat to slim shrinks the Europe/London
16052865ab3fSPhilip Paeps    file from 3648 to 1599 bytes, saving about 56%.  Fat and slim
16062865ab3fSPhilip Paeps    files represent the same set of timestamps and use the same TZif
16072865ab3fSPhilip Paeps    format as documented in tzfile(5) and in Internet RFC 8536.
16082865ab3fSPhilip Paeps    Fat format attempts to work around bugs or incompatibilities in
16092865ab3fSPhilip Paeps    older software, notably software that mishandles 64-bit TZif data
16102865ab3fSPhilip Paeps    or uses obsolete TZ strings like "EET-2EEST" that lack DST rules.
16112865ab3fSPhilip Paeps    Slim format is more efficient and does not work around 64-bit bugs
16122865ab3fSPhilip Paeps    or obsolete TZ strings.  Currently zic defaults to fat format
16132865ab3fSPhilip Paeps    unless you compile with -DZIC_BLOAT_DEFAULT=\"slim\"; this
16142865ab3fSPhilip Paeps    out-of-the-box default is intended to change in future releases
16152865ab3fSPhilip Paeps    as the buggy software often mishandles timestamps anyway.
16162865ab3fSPhilip Paeps
16172865ab3fSPhilip Paeps    zic no longer treats a set of rules ending in 2037 specially.
16182865ab3fSPhilip Paeps    Previously, zic assumed that such a ruleset meant that future
16192865ab3fSPhilip Paeps    timestamps could not be predicted, and therefore omitted a
16202865ab3fSPhilip Paeps    POSIX-like TZ string in the TZif output.  The old behavior is no
16212865ab3fSPhilip Paeps    longer needed for current tzdata, and caused problems with newlib
16222865ab3fSPhilip Paeps    when used with older tzdata (reported by David Gauchard).
16232865ab3fSPhilip Paeps
16242865ab3fSPhilip Paeps    zic no longer generates some artifact transitions.  For example,
16252865ab3fSPhilip Paeps    Europe/London no longer has a no-op transition in January 1996.
16262865ab3fSPhilip Paeps
16272865ab3fSPhilip Paeps  Changes to build procedure
16282865ab3fSPhilip Paeps
16292865ab3fSPhilip Paeps    tzdata.zi now assumes zic 2017c or later.  This shrinks tzdata.zi
16302865ab3fSPhilip Paeps    by a percent or so.
16312865ab3fSPhilip Paeps
16322865ab3fSPhilip Paeps  Changes to documentation and commentary
16332865ab3fSPhilip Paeps
16342865ab3fSPhilip Paeps    The Makefile now documents the POSIXRULES macro as being obsolete,
16352865ab3fSPhilip Paeps    and similarly, zic's -p POSIXRULES option is now documented as
16362865ab3fSPhilip Paeps    being obsolete.  Although the POSIXRULES feature still exists and
16372865ab3fSPhilip Paeps    works as before, in practice it is rarely used for its intended
16382865ab3fSPhilip Paeps    purpose, and it does not work either in the default reference
16392865ab3fSPhilip Paeps    implementation (for timestamps after 2037) or in common
16402865ab3fSPhilip Paeps    implementations such as GNU/Linux (for contemporary timestamps).
16412865ab3fSPhilip Paeps    Since POSIXRULES was designed primarily as a temporary transition
16422865ab3fSPhilip Paeps    facility for System V platforms that died off decades ago, it is
16432865ab3fSPhilip Paeps    being decommissioned rather than institutionalized.
16442865ab3fSPhilip Paeps
16452865ab3fSPhilip Paeps    New info on Bonin Islands and Marcus (thanks to Wakaba and Phake Nick).
16462865ab3fSPhilip Paeps
16472865ab3fSPhilip Paeps
16482865ab3fSPhilip PaepsRelease 2019a - 2019-03-25 22:01:33 -0700
1649ad48359aSPhilip Paeps
1650ad48359aSPhilip Paeps  Briefly:
1651ad48359aSPhilip Paeps    Palestine "springs forward" on 2019-03-30 instead of 2019-03-23.
1652ad48359aSPhilip Paeps    Metlakatla "fell back" to rejoin Alaska Time on 2019-01-20 at 02:00.
1653ad48359aSPhilip Paeps
1654ad48359aSPhilip Paeps  Changes to past and future timestamps
1655ad48359aSPhilip Paeps
1656ad48359aSPhilip Paeps    Palestine will not start DST until 2019-03-30, instead of 2019-03-23 as
1657ad48359aSPhilip Paeps    previously predicted.  Adjust our prediction by guessing that spring
1658ad48359aSPhilip Paeps    transitions will be between 24 and 30 March, which matches recent practice
1659ad48359aSPhilip Paeps    since 2016.  (Thanks to Even Scharning and Tim Parenti.)
1660ad48359aSPhilip Paeps
1661ad48359aSPhilip Paeps    Metlakatla ended its observance of Pacific standard time,
1662ad48359aSPhilip Paeps    rejoining Alaska Time, on 2019-01-20 at 02:00.  (Thanks to Ryan
1663ad48359aSPhilip Paeps    Stanley and Tim Parenti.)
1664ad48359aSPhilip Paeps
1665ad48359aSPhilip Paeps  Changes to past timestamps
1666ad48359aSPhilip Paeps
1667ad48359aSPhilip Paeps    Israel observed DST in 1980 (08-02/09-13) and 1984 (05-05/08-25).
1668ad48359aSPhilip Paeps    (Thanks to Alois Treindl and Isaac Starkman.)
1669ad48359aSPhilip Paeps
1670ad48359aSPhilip Paeps  Changes to time zone abbreviations
1671ad48359aSPhilip Paeps
1672ad48359aSPhilip Paeps    Etc/UCT is now a backward-compatibility link to Etc/UTC, instead
1673ad48359aSPhilip Paeps    of being a separate zone that generates the abbreviation "UCT",
1674ad48359aSPhilip Paeps    which nowadays is typically a typo.  (Problem reported by Isiah
1675ad48359aSPhilip Paeps    Meadows.)
1676ad48359aSPhilip Paeps
1677ad48359aSPhilip Paeps  Changes to code
1678ad48359aSPhilip Paeps
1679ad48359aSPhilip Paeps    zic now has an -r option to limit the time range of output data.
1680ad48359aSPhilip Paeps    For example, 'zic -r @1000000000' limits the output data to
1681ad48359aSPhilip Paeps    timestamps starting 1000000000 seconds after the Epoch.
1682ad48359aSPhilip Paeps    This helps shrink output size and can be useful for applications
1683ad48359aSPhilip Paeps    not needing the full timestamp history, such as TZDIST truncation;
1684ad48359aSPhilip Paeps    see Internet RFC 8536 section 5.1.  (Inspired by a feature request
1685ad48359aSPhilip Paeps    from Christopher Wong, helped along by bug reports from Wong and
1686ad48359aSPhilip Paeps    from Tim Parenti.)
1687ad48359aSPhilip Paeps
1688ad48359aSPhilip Paeps  Changes to documentation
1689ad48359aSPhilip Paeps
1690ad48359aSPhilip Paeps    Mention Internet RFC 8536 (February 2019), which documents TZif.
1691ad48359aSPhilip Paeps
1692ad48359aSPhilip Paeps    tz-link.html now cites tzdata-meta
1693ad48359aSPhilip Paeps    <https://tzdata-meta.timtimeonline.com/>.
1694ad48359aSPhilip Paeps
1695ad48359aSPhilip Paeps
1696d595db73SPhilip PaepsRelease 2018i - 2018-12-30 11:05:43 -0800
1697d595db73SPhilip Paeps
1698d595db73SPhilip Paeps  Briefly:
1699d595db73SPhilip Paeps    São Tomé and Príncipe switches from +01 to +00 on 2019-01-01.
1700d595db73SPhilip Paeps
1701d595db73SPhilip Paeps  Changes to future timestamps
1702d595db73SPhilip Paeps
1703d595db73SPhilip Paeps    Due to a change in government, São Tomé and Príncipe switches back
1704d595db73SPhilip Paeps    from +01 to +00 on 2019-01-01 at 02:00.  (Thanks to Vadim
1705d595db73SPhilip Paeps    Nasardinov and Michael Deckers.)
1706d595db73SPhilip Paeps
1707d595db73SPhilip Paeps
17082c5e84ccSPhilip PaepsRelease 2018h - 2018-12-23 17:59:32 -0800
1709b9994124SPhilip Paeps
1710b9994124SPhilip Paeps  Briefly:
17112c5e84ccSPhilip Paeps    Qyzylorda, Kazakhstan moved from +06 to +05 on 2018-12-21.
17122c5e84ccSPhilip Paeps    New zone Asia/Qostanay because Qostanay, Kazakhstan didn't move.
17132c5e84ccSPhilip Paeps    Metlakatla, Alaska observes PST this winter only.
17142c5e84ccSPhilip Paeps    Guess Morocco will continue to adjust clocks around Ramadan.
17152c5e84ccSPhilip Paeps    Add predictions for Iran from 2038 through 2090.
1716b9994124SPhilip Paeps
1717b9994124SPhilip Paeps  Changes to future timestamps
1718b9994124SPhilip Paeps
17192c5e84ccSPhilip Paeps    Guess that Morocco will continue to fall back just before and
17202c5e84ccSPhilip Paeps    spring forward just after Ramadan, the practice since 2012.
17212c5e84ccSPhilip Paeps    (Thanks to Maamar Abdelkader.)  This means Morocco will observe
17222c5e84ccSPhilip Paeps    negative DST during Ramadan in main and vanguard formats, and in
17232c5e84ccSPhilip Paeps    rearguard format it stays in the +00 timezone and observes
17242c5e84ccSPhilip Paeps    ordinary DST in all months other than Ramadan.  As before, extend
17252c5e84ccSPhilip Paeps    this guesswork to the year 2037.  As a consequence, Morocco is
17262c5e84ccSPhilip Paeps    scheduled to observe three DST transitions in some Gregorian years
17272c5e84ccSPhilip Paeps    (e.g., 2033) due to the mismatch between the Gregorian and Islamic
17282c5e84ccSPhilip Paeps    calendars.
17292c5e84ccSPhilip Paeps
17302c5e84ccSPhilip Paeps    The table of exact transitions for Iranian DST has been extended.
17312c5e84ccSPhilip Paeps    It formerly cut off before the year 2038 in a nod to 32-bit time_t.
17322c5e84ccSPhilip Paeps    It now cuts off before 2091 as there is doubt about how the Persian
17332c5e84ccSPhilip Paeps    calendar will treat 2091.  This change predicts DST transitions in
17342c5e84ccSPhilip Paeps    2038-9, 2042-3, and 2046-7 to occur one day later than previously
17352c5e84ccSPhilip Paeps    predicted.  As before, post-cutoff transitions are approximated.
17362c5e84ccSPhilip Paeps
17372c5e84ccSPhilip Paeps  Changes to past and future timestamps
17382c5e84ccSPhilip Paeps
17392c5e84ccSPhilip Paeps    Qyzylorda (aka Kyzylorda) oblast in Kazakhstan moved from +06 to
17402c5e84ccSPhilip Paeps    +05 on 2018-12-21.  This is a zone split as Qostanay (aka
17412c5e84ccSPhilip Paeps    Kostanay) did not switch, so create a zone Asia/Qostanay.
17422c5e84ccSPhilip Paeps
17432c5e84ccSPhilip Paeps    Metlakatla moved from Alaska to Pacific standard time on 2018-11-04.
17442c5e84ccSPhilip Paeps    It did not change clocks that day and remains on -08 this winter.
17452c5e84ccSPhilip Paeps    (Thanks to Ryan Stanley.)  It will revert to the usual Alaska
17462c5e84ccSPhilip Paeps    rules next spring, so this change affects only timestamps
17472c5e84ccSPhilip Paeps    from 2018-11-04 through 2019-03-10.
17482c5e84ccSPhilip Paeps
17492c5e84ccSPhilip Paeps  Change to past timestamps
17502c5e84ccSPhilip Paeps
17512c5e84ccSPhilip Paeps    Kwajalein's 1993-08-20 transition from -12 to +12 was at 24:00,
17522c5e84ccSPhilip Paeps    not 00:00.  I transcribed the time incorrectly from Shanks.
17532c5e84ccSPhilip Paeps    (Thanks to Phake Nick.)
17542c5e84ccSPhilip Paeps
17552c5e84ccSPhilip Paeps    Nauru's 1979 transition was on 02-10 at 02:00, not 05-01 at 00:00.
17562c5e84ccSPhilip Paeps    (Thanks to Phake Nick.)
17572c5e84ccSPhilip Paeps
17582c5e84ccSPhilip Paeps    Guam observed DST irregularly from 1959 through 1977.
17592c5e84ccSPhilip Paeps    (Thanks to Phake Nick.)
17602c5e84ccSPhilip Paeps
17612c5e84ccSPhilip Paeps    Hong Kong observed DST in 1941 starting 06-15 (not 04-01), then on
17622c5e84ccSPhilip Paeps    10-01 changed standard time to +08:30 (not +08).  Its transition
17632c5e84ccSPhilip Paeps    back to +08 after WWII was on 1945-09-15, not the previous day.
17642c5e84ccSPhilip Paeps    Its 1904-10-30 change took effect at 01:00 +08 (not 00:00 LMT).
17652c5e84ccSPhilip Paeps    (Thanks to Phake Nick, Steve Allen, and Joseph Myers.)  Also,
17662c5e84ccSPhilip Paeps    its 1952 fallback was on 11-02 (not 10-25).
17672c5e84ccSPhilip Paeps
17682c5e84ccSPhilip Paeps    This release contains many changes to timestamps before 1946 due
17692c5e84ccSPhilip Paeps    to Japanese possession or occupation of Pacific/Chuuk,
17702c5e84ccSPhilip Paeps    Pacific/Guam, Pacific/Kosrae, Pacific/Kwajalein, Pacific/Majuro,
17712c5e84ccSPhilip Paeps    Pacific/Nauru, Pacific/Palau, and Pacific/Pohnpei.
17722c5e84ccSPhilip Paeps    (Thanks to Phake Nick.)
17732c5e84ccSPhilip Paeps
17742c5e84ccSPhilip Paeps    Assume that the Spanish East Indies was like the Philippines and
17752c5e84ccSPhilip Paeps    observed American time until the end of 1844.  This affects
17762c5e84ccSPhilip Paeps    Pacific/Chuuk, Pacific/Kosrae, Pacific/Palau, and Pacific/Pohnpei.
17772c5e84ccSPhilip Paeps
17782c5e84ccSPhilip Paeps  Changes to past tm_isdst flags
17792c5e84ccSPhilip Paeps
17802c5e84ccSPhilip Paeps    For the recent Morocco change, the tm_isdst flag should be 1 from
17812c5e84ccSPhilip Paeps    2018-10-27 00:00 to 2018-10-28 03:00.  (Thanks to Michael Deckers.)
17822c5e84ccSPhilip Paeps    Give a URL to the official decree.  (Thanks to Matt Johnson.)
17832c5e84ccSPhilip Paeps
17842c5e84ccSPhilip Paeps
17852c5e84ccSPhilip PaepsRelease 2018g - 2018-10-26 22:22:45 -0700
17862c5e84ccSPhilip Paeps
17872c5e84ccSPhilip Paeps  Briefly:
17882c5e84ccSPhilip Paeps    Morocco switches to permanent +01 on 2018-10-28.
17892c5e84ccSPhilip Paeps
17902c5e84ccSPhilip Paeps  Changes to future timestamps
17912c5e84ccSPhilip Paeps
17922c5e84ccSPhilip Paeps    Morocco switches from +00/+01 to permanent +01 effective 2018-10-28,
17932c5e84ccSPhilip Paeps    so its clocks will not fall back as previously scheduled.
1794b9994124SPhilip Paeps    (Thanks to Mohamed Essedik Najd and Brian Inglis.)
1795b9994124SPhilip Paeps
1796b9994124SPhilip Paeps  Changes to code
1797b9994124SPhilip Paeps
1798b9994124SPhilip Paeps    When generating TZif files with leap seconds, zic no longer uses a
1799b9994124SPhilip Paeps    format that trips up older 32-bit clients, fixing a bug introduced
1800b9994124SPhilip Paeps    in 2018f.  (Reported by Daniel Fischer.)  Also, the zic workaround
1801b9994124SPhilip Paeps    for QTBUG-53071 now also works for TZif files with leap seconds.
1802b9994124SPhilip Paeps
1803b9994124SPhilip Paeps    The translator to rearguard format now rewrites the line
1804b9994124SPhilip Paeps    "Rule Japan 1948 1951 - Sep Sat>=8 25:00 0 S" to
1805b9994124SPhilip Paeps    "Rule Japan 1948 1951 - Sep Sun>=9  1:00 0 S".
1806b9994124SPhilip Paeps    This caters to zic before 2007 and to Oracle TZUpdater 2.2.0
1807b9994124SPhilip Paeps    and earlier.  (Reported by Christos Zoulas.)
1808b9994124SPhilip Paeps
1809b9994124SPhilip Paeps  Changes to past time zone abbreviations
1810b9994124SPhilip Paeps
1811b9994124SPhilip Paeps    Change HDT to HWT/HPT for WWII-era abbreviations in Hawaii.
1812b9994124SPhilip Paeps    This reverts to 2011h, as the abbreviation change in 2011i was
1813b9994124SPhilip Paeps    likely inadvertent.
1814b9994124SPhilip Paeps
1815b9994124SPhilip Paeps  Changes to documentation
1816b9994124SPhilip Paeps
1817b9994124SPhilip Paeps    tzfile.5 has new sections on interoperability issues.
1818b9994124SPhilip Paeps
1819b9994124SPhilip Paeps
182089abb9f8SPhilip PaepsRelease 2018f - 2018-10-18 00:14:18 -0700
182189abb9f8SPhilip Paeps
182289abb9f8SPhilip Paeps  Briefly:
182389abb9f8SPhilip Paeps  Volgograd moves from +03 to +04 on 2018-10-28.
182489abb9f8SPhilip Paeps  Fiji ends DST 2019-01-13, not 2019-01-20.
182589abb9f8SPhilip Paeps  Most of Chile changes DST dates, effective 2019-04-06.
182689abb9f8SPhilip Paeps
182789abb9f8SPhilip Paeps  Changes to future timestamps
182889abb9f8SPhilip Paeps
182989abb9f8SPhilip Paeps    Volgograd moves from +03 to +04 on 2018-10-28 at 02:00.
183089abb9f8SPhilip Paeps    (Thanks to Alexander Fetisov and Stepan Golosunov.)
183189abb9f8SPhilip Paeps
183289abb9f8SPhilip Paeps    Fiji ends DST 2019-01-13 instead of the 2019-01-20 previously
183389abb9f8SPhilip Paeps    predicted.  (Thanks to Raymond Kumar.)  Adjust future predictions
183489abb9f8SPhilip Paeps    accordingly.
183589abb9f8SPhilip Paeps
183689abb9f8SPhilip Paeps    Most of Chile will end DST on the first Saturday in April at 24:00 mainland
183789abb9f8SPhilip Paeps    time, and resume DST on the first Saturday in September at 24:00 mainland
183889abb9f8SPhilip Paeps    time.  The changes are effective from 2019-04-06, and do not affect the
183989abb9f8SPhilip Paeps    Magallanes region modeled by America/Punta_Arenas.  (Thanks to Juan Correa
184089abb9f8SPhilip Paeps    and Tim Parenti.)  Adjust future predictions accordingly.
184189abb9f8SPhilip Paeps
184289abb9f8SPhilip Paeps  Changes to past timestamps
184389abb9f8SPhilip Paeps
184489abb9f8SPhilip Paeps    The 2018-05-05 North Korea 30-minute time zone change took place
184589abb9f8SPhilip Paeps    at 23:30 the previous day, not at 00:00 that day.
184689abb9f8SPhilip Paeps
184789abb9f8SPhilip Paeps    China's 1988 spring-forward transition was on April 17, not
184889abb9f8SPhilip Paeps    April 10.  Its DST transitions in 1986/91 were at 02:00, not 00:00.
184989abb9f8SPhilip Paeps    (Thanks to P Chan.)
185089abb9f8SPhilip Paeps
185189abb9f8SPhilip Paeps    Fix several issues for Macau before 1992.  Macau's pre-1904 LMT
185289abb9f8SPhilip Paeps    was off by 10 s.  Macau switched to +08 in 1904 not 1912, and
185389abb9f8SPhilip Paeps    temporarily switched to +09/+10 during World War II.  Macau
185489abb9f8SPhilip Paeps    observed DST in 1942/79, not 1961/80, and there were several
185589abb9f8SPhilip Paeps    errors for transition times and dates.  (Thanks to P Chan.)
185689abb9f8SPhilip Paeps
185789abb9f8SPhilip Paeps    The 1948-1951 fallback transitions in Japan were at 25:00 on
185889abb9f8SPhilip Paeps    September's second Saturday, not at 24:00.  (Thanks to Phake Nick.)
185989abb9f8SPhilip Paeps    zic turns this into 01:00 on the day after September's second
186089abb9f8SPhilip Paeps    Saturday, which is the best that POSIX or C platforms can do.
186189abb9f8SPhilip Paeps
186289abb9f8SPhilip Paeps    Incorporate 1940-1949 Asia/Shanghai DST transitions from a 2014
186389abb9f8SPhilip Paeps    paper by Li Yu, replacing more-questionable data from Shanks.
186489abb9f8SPhilip Paeps
186589abb9f8SPhilip Paeps  Changes to time zone abbreviations
186689abb9f8SPhilip Paeps
186789abb9f8SPhilip Paeps    Use "PST" and "PDT" for Philippine time.  (Thanks to Paul Goyette.)
186889abb9f8SPhilip Paeps
186989abb9f8SPhilip Paeps  Changes to code
187089abb9f8SPhilip Paeps
187189abb9f8SPhilip Paeps    zic now always generates TZif files where time type 0 is used for
187289abb9f8SPhilip Paeps    timestamps before the first transition.  This simplifies the
187389abb9f8SPhilip Paeps    reading of TZif files and should not affect behavior of existing
187489abb9f8SPhilip Paeps    TZif readers because the same set of time types is used; only
187589abb9f8SPhilip Paeps    their internal indexes may have changed.  This affects only the
187689abb9f8SPhilip Paeps    legacy zones EST5EDT, CST6CDT, MST7MDT, PST8PDT, CET, MET, and
187789abb9f8SPhilip Paeps    EET, which previously used nonzero types for these timestamps.
187889abb9f8SPhilip Paeps
187989abb9f8SPhilip Paeps    Because of the type 0 change, zic no longer outputs a dummy
188089abb9f8SPhilip Paeps    transition at time -2**59 (before the Big Bang), as clients should
188189abb9f8SPhilip Paeps    no longer need this to handle historical timestamps correctly.
188289abb9f8SPhilip Paeps    This reverts a change introduced in 2013d and shrinks most TZif
188389abb9f8SPhilip Paeps    files by a few bytes.
188489abb9f8SPhilip Paeps
188589abb9f8SPhilip Paeps    zic now supports negative time-of-day in Rule and Leap lines, e.g.,
188689abb9f8SPhilip Paeps    "Rule X min max - Apr lastSun -6:00 1:00 -" means the transition
188789abb9f8SPhilip Paeps    occurs at 18:00 on the Saturday before the last Sunday in April.
188889abb9f8SPhilip Paeps    This behavior was documented in 2018a but the code did not
188989abb9f8SPhilip Paeps    entirely match the documentation.
189089abb9f8SPhilip Paeps
189189abb9f8SPhilip Paeps    localtime.c no longer requires at least one time type in TZif
189289abb9f8SPhilip Paeps    files that lack transitions or have a POSIX-style TZ string.  This
189389abb9f8SPhilip Paeps    future-proofs the code against possible future extensions to the
189489abb9f8SPhilip Paeps    format that would allow TZif files with POSIX-style TZ strings and
189589abb9f8SPhilip Paeps    without transitions or time types.
189689abb9f8SPhilip Paeps
189789abb9f8SPhilip Paeps    A read-access subscript error in localtime.c has been fixed.
189889abb9f8SPhilip Paeps    It could occur only in TZif files with timecnt == 0, something that
189989abb9f8SPhilip Paeps    does not happen in practice now but could happen in future versions.
190089abb9f8SPhilip Paeps
190189abb9f8SPhilip Paeps    localtime.c no longer ignores TZif POSIX-style TZ strings that
190289abb9f8SPhilip Paeps    specify only standard time.  Instead, these TZ strings now
190389abb9f8SPhilip Paeps    override the default time type for timestamps after the last
190489abb9f8SPhilip Paeps    transition (or for all timestamps if there are no transitions),
190589abb9f8SPhilip Paeps    just as DST strings specifying DST have always done.
190689abb9f8SPhilip Paeps
190789abb9f8SPhilip Paeps    leapseconds.awk now outputs "#updated" and "#expires" comments,
190889abb9f8SPhilip Paeps    and supports leap seconds at the ends of months other than June
190989abb9f8SPhilip Paeps    and December.  (Inspired by suggestions from Chris Woodbury.)
191089abb9f8SPhilip Paeps
191189abb9f8SPhilip Paeps  Changes to documentation
191289abb9f8SPhilip Paeps
191389abb9f8SPhilip Paeps    New restrictions: A Rule name must start with a character that
191489abb9f8SPhilip Paeps    is neither an ASCII digit nor "-" nor "+", and an unquoted name
191589abb9f8SPhilip Paeps    should not use characters in the set "!$%&'()*,/:;<=>?@[\]^`{|}~".
191689abb9f8SPhilip Paeps    The latter restriction makes room for future extensions (a
191789abb9f8SPhilip Paeps    possibility noted by Tom Lane).
191889abb9f8SPhilip Paeps
191989abb9f8SPhilip Paeps    tzfile.5 now documents what time types apply before the first and
192089abb9f8SPhilip Paeps    after the last transition, if any.
192189abb9f8SPhilip Paeps
192289abb9f8SPhilip Paeps    Documentation now uses the spelling "timezone" for a TZ setting
192389abb9f8SPhilip Paeps    that determines timestamp history, and "time zone" for a
192489abb9f8SPhilip Paeps    geographic region currently sharing the same standard time.
192589abb9f8SPhilip Paeps
192689abb9f8SPhilip Paeps    The name "TZif" is now used for the tz binary data format.
192789abb9f8SPhilip Paeps
192889abb9f8SPhilip Paeps    tz-link.htm now mentions the A0 TimeZone Migration utilities.
192989abb9f8SPhilip Paeps    (Thanks to Aldrin Martoq for the link.)
193089abb9f8SPhilip Paeps
193189abb9f8SPhilip Paeps  Changes to build procedure
193289abb9f8SPhilip Paeps
193389abb9f8SPhilip Paeps    New 'make' target 'rearguard_tarballs' to build the rearguard
193489abb9f8SPhilip Paeps    tarball only.  This is a convenience on platforms that lack lzip
193589abb9f8SPhilip Paeps    if you want to build the rearguard tarball.  (Problem reported by
193689abb9f8SPhilip Paeps    Deborah Goldsmith.)
193789abb9f8SPhilip Paeps
193889abb9f8SPhilip Paeps    tzdata.zi is now more stable from release to release.  (Problem
193989abb9f8SPhilip Paeps    noted by Tom Lane.)  It is also a bit shorter.
194089abb9f8SPhilip Paeps
194189abb9f8SPhilip Paeps    tzdata.zi now can contain comment lines documenting configuration
194289abb9f8SPhilip Paeps    information, such as which data format was selected, which input
194389abb9f8SPhilip Paeps    files were used, and how leap seconds are treated.  (Problems
194489abb9f8SPhilip Paeps    noted by Lester Caine and Brian Inglis.)  If the Makefile defaults
194589abb9f8SPhilip Paeps    are used these comment lines are absent, for backward
194689abb9f8SPhilip Paeps    compatibility.  A redistributor intending to alter its copy of the
194789abb9f8SPhilip Paeps    files should also append "-LABEL" to the 'version' file's first
194889abb9f8SPhilip Paeps    line, where "LABEL" identifies the redistributor's change.
194989abb9f8SPhilip Paeps
195089abb9f8SPhilip Paeps
1951d81c2dd9SPhilip PaepsRelease 2018e - 2018-05-01 23:42:51 -0700
1952d81c2dd9SPhilip Paeps
1953d81c2dd9SPhilip Paeps  Briefly:
1954d81c2dd9SPhilip Paeps
1955d81c2dd9SPhilip Paeps    North Korea switches back to +09 on 2018-05-05.
1956d81c2dd9SPhilip Paeps    The main format uses negative DST again, for Ireland etc.
1957d81c2dd9SPhilip Paeps    'make tarballs' now also builds a rearguard tarball.
1958d81c2dd9SPhilip Paeps    New 's' and 'd' suffixes in SAVE columns of Rule and Zone lines.
1959d81c2dd9SPhilip Paeps
1960d81c2dd9SPhilip Paeps  Changes to past and future timestamps
1961d81c2dd9SPhilip Paeps
1962d81c2dd9SPhilip Paeps    North Korea switches back from +0830 to +09 on 2018-05-05.
1963d81c2dd9SPhilip Paeps    (Thanks to Kang Seonghoon, Arthur David Olson, Seo Sanghyeon,
1964d81c2dd9SPhilip Paeps    and Tim Parenti.)
1965d81c2dd9SPhilip Paeps
1966d81c2dd9SPhilip Paeps    Bring back the negative-DST changes of 2018a, except be more
1967d81c2dd9SPhilip Paeps    compatible with data parsers that do not support negative DST.
1968d81c2dd9SPhilip Paeps    Also, this now affects historical timestamps in Namibia and the
1969d81c2dd9SPhilip Paeps    former Czechoslovakia, not just Ireland.  The main format now uses
1970d81c2dd9SPhilip Paeps    negative DST to model timestamps in Europe/Dublin (from 1971 on),
1971d81c2dd9SPhilip Paeps    Europe/Prague (1946/7), and Africa/Windhoek (1994/2017).  This
1972d81c2dd9SPhilip Paeps    does not affect UT offsets, only time zone abbreviations and the
1973d81c2dd9SPhilip Paeps    tm_isdst flag.  Also, this does not affect rearguard or vanguard
1974d81c2dd9SPhilip Paeps    formats; effectively the main format now uses vanguard instead of
1975d81c2dd9SPhilip Paeps    rearguard format.  Data parsers that do not support negative DST
1976d81c2dd9SPhilip Paeps    can still use data from the rearguard tarball described below.
1977d81c2dd9SPhilip Paeps
1978d81c2dd9SPhilip Paeps  Changes to build procedure
1979d81c2dd9SPhilip Paeps
1980d81c2dd9SPhilip Paeps    The command 'make tarballs' now also builds the tarball
1981d81c2dd9SPhilip Paeps    tzdataVERSION-rearguard.tar.gz, which is like tzdataVERSION.tar.gz
1982d81c2dd9SPhilip Paeps    except that it uses rearguard format intended for trailing-edge
1983d81c2dd9SPhilip Paeps    data parsers.
1984d81c2dd9SPhilip Paeps
1985d81c2dd9SPhilip Paeps  Changes to data format and to code
1986d81c2dd9SPhilip Paeps
1987d81c2dd9SPhilip Paeps    The SAVE column of Rule and Zone lines can now have an 's' or 'd'
1988d81c2dd9SPhilip Paeps    suffix, which specifies whether the adjusted time is standard time
1989d81c2dd9SPhilip Paeps    or daylight saving time.  If no suffix is given, daylight saving
1990d81c2dd9SPhilip Paeps    time is used if and only if the SAVE column is nonzero; this is
1991d81c2dd9SPhilip Paeps    the longstanding behavior.  Although this new feature is not used
1992d81c2dd9SPhilip Paeps    in tzdata, it could be used to specify the legal time in Namibia
1993d81c2dd9SPhilip Paeps    1994-2017, as opposed to the popular time (see below).
1994d81c2dd9SPhilip Paeps
1995d81c2dd9SPhilip Paeps  Changes to past timestamps
1996d81c2dd9SPhilip Paeps
1997d81c2dd9SPhilip Paeps    From 1994 through 2017 Namibia observed DST in winter, not summer.
1998d81c2dd9SPhilip Paeps    That is, it used negative DST, as Ireland still does.  This change
1999d81c2dd9SPhilip Paeps    does not affect UTC offsets; it affects only the tm_isdst flag and
2000d81c2dd9SPhilip Paeps    the abbreviation used during summer, which is now CAT, not WAST.
2001d81c2dd9SPhilip Paeps    Although (as noted by Michael Deckers) summer and winter time were
2002d81c2dd9SPhilip Paeps    both simply called "standard time" in Namibian law, in common
2003d81c2dd9SPhilip Paeps    practice winter time was considered to be DST (as noted by Stephen
2004d81c2dd9SPhilip Paeps    Colebourne).  The full effect of this change is only in vanguard
200589abb9f8SPhilip Paeps    and main format; in rearguard format, the tm_isdst flag is still
2006d81c2dd9SPhilip Paeps    zero in winter and nonzero in summer.
2007d81c2dd9SPhilip Paeps
2008d81c2dd9SPhilip Paeps    In 1946/7 Czechoslovakia also observed negative DST in winter.
200989abb9f8SPhilip Paeps    The full effect of this change is only in vanguard and main
201089abb9f8SPhilip Paeps    formats; in rearguard format, it is modeled as plain GMT without
2011d81c2dd9SPhilip Paeps    daylight saving.  Also, the dates of some 1944/5 DST transitions
2012d81c2dd9SPhilip Paeps    in Czechoslovakia have been changed.
2013d81c2dd9SPhilip Paeps
2014d81c2dd9SPhilip Paeps
201546bee4edSPhilip PaepsRelease 2018d - 2018-03-22 07:05:46 -0700
201646bee4edSPhilip Paeps
201746bee4edSPhilip Paeps  Briefly:
201846bee4edSPhilip Paeps
201946bee4edSPhilip Paeps  Palestine starts DST a week earlier in 2018.
202046bee4edSPhilip Paeps  Add support for vanguard and rearguard data consumers.
202146bee4edSPhilip Paeps  Add subsecond precision to source data format, though not to data.
202246bee4edSPhilip Paeps
202346bee4edSPhilip Paeps  Changes to future timestamps
202446bee4edSPhilip Paeps
202546bee4edSPhilip Paeps    In 2018, Palestine starts DST on March 24, not March 31.
202646bee4edSPhilip Paeps    Adjust future predictions accordingly.  (Thanks to Sharef Mustafa.)
202746bee4edSPhilip Paeps
202846bee4edSPhilip Paeps  Changes to past and future timestamps
202946bee4edSPhilip Paeps
203046bee4edSPhilip Paeps    Casey Station in Antarctica changed from +11 to +08 on 2018-03-11
203146bee4edSPhilip Paeps    at 04:00.  (Thanks to Steffen Thorsen.)
203246bee4edSPhilip Paeps
203346bee4edSPhilip Paeps  Changes to past timestamps
203446bee4edSPhilip Paeps
203546bee4edSPhilip Paeps    Historical transitions for Uruguay, represented by
203646bee4edSPhilip Paeps    America/Montevideo, have been updated per official legal documents,
203746bee4edSPhilip Paeps    replacing previous data mainly originating from the inventions of
203846bee4edSPhilip Paeps    Shanks & Pottenger.  This has resulted in adjustments ranging from
203946bee4edSPhilip Paeps    30 to 90 minutes in either direction over at least two dozen
204046bee4edSPhilip Paeps    distinct periods ranging from one day to several years in length.
204146bee4edSPhilip Paeps    A mere handful of pre-1991 transitions are unaffected; data since
204246bee4edSPhilip Paeps    then has come from more reliable contemporaneous reporting.  These
204346bee4edSPhilip Paeps    changes affect various timestamps in 1920-1923, 1936, 1939,
204446bee4edSPhilip Paeps    1942-1943, 1959, 1966-1970, 1972, 1974-1980, and 1988-1990.
204546bee4edSPhilip Paeps    Additionally, Uruguay's pre-standard-time UT offset has been
204646bee4edSPhilip Paeps    adjusted westward by 7 seconds, from UT-03:44:44 to UT-03:44:51, to
204746bee4edSPhilip Paeps    match the location of the Observatory of the National Meteorological
204846bee4edSPhilip Paeps    Institute in Montevideo.
204946bee4edSPhilip Paeps    (Thanks to Jeremie Bonjour, Tim Parenti, and Michael Deckers.)
205046bee4edSPhilip Paeps
205194c2d487SPhilip Paeps    East Kiribati skipped New Year's Eve 1994, not New Year's Day 1995.
205294c2d487SPhilip Paeps    (Thanks to Kerry Shetline.)
205346bee4edSPhilip Paeps
2054d81c2dd9SPhilip Paeps    Fix the 1912-01-01 transition for Portugal and its colonies.
205546bee4edSPhilip Paeps    This transition was at 00:00 according to the new UT offset, not
205646bee4edSPhilip Paeps    according to the old one.  Also assume that Cape Verde switched on
205746bee4edSPhilip Paeps    the same date as the rest, not in 1907.  This affects
205846bee4edSPhilip Paeps    Africa/Bissau, Africa/Sao_Tome, Asia/Macau, Atlantic/Azores,
205946bee4edSPhilip Paeps    Atlantic/Cape_Verde, Atlantic/Madeira, and Europe/Lisbon.
206046bee4edSPhilip Paeps    (Thanks to Michael Deckers.)
206146bee4edSPhilip Paeps
206246bee4edSPhilip Paeps    Fix an off-by-1 error for pre-1913 timestamps in Jamaica and in
206346bee4edSPhilip Paeps    Turks & Caicos.
206446bee4edSPhilip Paeps
206546bee4edSPhilip Paeps  Changes to past time zone abbreviations
206646bee4edSPhilip Paeps
206746bee4edSPhilip Paeps    MMT took effect in Uruguay from 1908-06-10, not 1898-06-28.  There
206846bee4edSPhilip Paeps    is no clock change associated with the transition.
206946bee4edSPhilip Paeps
207046bee4edSPhilip Paeps  Changes to build procedure
207146bee4edSPhilip Paeps
207246bee4edSPhilip Paeps    The new DATAFORM macro in the Makefile lets the installer choose
207346bee4edSPhilip Paeps    among three source data formats.  The idea is to lessen downstream
207446bee4edSPhilip Paeps    disruption when data formats are improved.
207546bee4edSPhilip Paeps
207646bee4edSPhilip Paeps    * DATAFORM=vanguard installs from the latest, bleeding-edge
207746bee4edSPhilip Paeps      format.  DATAFORM=main (the default) installs from the format
207846bee4edSPhilip Paeps      used in the 'africa' etc. files.  DATAFORM=rearguard installs
207946bee4edSPhilip Paeps      from a trailing-edge format.  Eventually, elements of today's
208046bee4edSPhilip Paeps      vanguard format should move to the main format, and similarly
208146bee4edSPhilip Paeps      the main format's features should eventually move to the
208246bee4edSPhilip Paeps      rearguard format.
208346bee4edSPhilip Paeps
208446bee4edSPhilip Paeps    * In the current version, the main and rearguard formats are
208546bee4edSPhilip Paeps      identical and match that of 2018c, so this change does not
208646bee4edSPhilip Paeps      affect default behavior.  The vanguard format currently contains
208746bee4edSPhilip Paeps      one feature not in the main format: negative SAVE values.  This
208846bee4edSPhilip Paeps      improves support for Ireland, which uses Irish Standard Time
208946bee4edSPhilip Paeps      (IST, UTC+01) in summer and GMT (UTC) in winter.  tzcode has
209046bee4edSPhilip Paeps      supported negative SAVE values for decades, and this feature
209146bee4edSPhilip Paeps      should move to the main format soon.  However, it will not move
209246bee4edSPhilip Paeps      to the rearguard format for quite some time because some
209346bee4edSPhilip Paeps      downstream parsers do not support it.
209446bee4edSPhilip Paeps
209546bee4edSPhilip Paeps    * The build procedure constructs three files vanguard.zi, main.zi,
2096ad48359aSPhilip Paeps      and rearguard.zi, one for each format.  Although the files
2097ad48359aSPhilip Paeps      represent essentially the same data, they may have minor
2098ad48359aSPhilip Paeps      discrepancies that users are not likely to notice.  The files
209946bee4edSPhilip Paeps      are intended for downstream data consumers and are not
210046bee4edSPhilip Paeps      installed.  Zoneinfo parsers that do not support negative SAVE values
210146bee4edSPhilip Paeps      should start using rearguard.zi, so that they will be unaffected
210246bee4edSPhilip Paeps      when the negative-DST feature moves from vanguard to main.
210346bee4edSPhilip Paeps      Bleeding-edge Zoneinfo parsers that support the new features
210446bee4edSPhilip Paeps      already can use vanguard.zi; in this respect, current tzcode is
210546bee4edSPhilip Paeps      bleeding-edge.
210646bee4edSPhilip Paeps
210746bee4edSPhilip Paeps    The Makefile should now be safe for parallelized builds, and 'make
210846bee4edSPhilip Paeps    -j to2050new.tzs' is now much faster on a multiprocessor host
210946bee4edSPhilip Paeps    with GNU Make.
211046bee4edSPhilip Paeps
211146bee4edSPhilip Paeps    When built with -DSUPPRESS_TZDIR, the tzcode library no longer
211246bee4edSPhilip Paeps    prepends TZDIR/ to file names that do not begin with '/'.  This is
211346bee4edSPhilip Paeps    not recommended for general use, due to its security implications.
211446bee4edSPhilip Paeps    (From a suggestion by Manuela Friedrich.)
211546bee4edSPhilip Paeps
211646bee4edSPhilip Paeps  Changes to code
211746bee4edSPhilip Paeps
211846bee4edSPhilip Paeps    zic now accepts subsecond precision in expressions like
211946bee4edSPhilip Paeps    00:19:32.13, which is approximately the legal time of the
212046bee4edSPhilip Paeps    Netherlands from 1835 to 1937.  However, because it is
212146bee4edSPhilip Paeps    questionable whether the few recorded uses of non-integer offsets
212246bee4edSPhilip Paeps    had subsecond precision in practice, there are no plans for tzdata
212346bee4edSPhilip Paeps    to use this feature.  (Thanks to Steve Allen for pointing out
212446bee4edSPhilip Paeps    the limitations of historical data in this area.)
212546bee4edSPhilip Paeps
212646bee4edSPhilip Paeps    The code is a bit more portable to MS-Windows.  Installers can
212746bee4edSPhilip Paeps    compile with -DRESERVE_STD_EXT_IDS on MS-Windows platforms that
212846bee4edSPhilip Paeps    reserve identifiers like 'localtime'.  (Thanks to Manuela
21292865ab3fSPhilip Paeps    Friedrich.)
213046bee4edSPhilip Paeps
213146bee4edSPhilip Paeps  Changes to documentation and commentary
213246bee4edSPhilip Paeps
213346bee4edSPhilip Paeps    theory.html now outlines tzdb's extensions to POSIX's model for
213446bee4edSPhilip Paeps    civil time, and has a section "POSIX features no longer needed"
213546bee4edSPhilip Paeps    that lists POSIX API components that are now vestigial.
213646bee4edSPhilip Paeps    (From suggestions by Steve Summit.)  It also better distinguishes
213746bee4edSPhilip Paeps    time zones from tz regions.  (From a suggestion by Guy Harris.)
213846bee4edSPhilip Paeps
213946bee4edSPhilip Paeps    Commentary is now more consistent about using the phrase "daylight
214046bee4edSPhilip Paeps    saving time", to match the C name tm_isdst.  Daylight saving time
214146bee4edSPhilip Paeps    need not occur in summer, and need not have a positive offset from
214246bee4edSPhilip Paeps    standard time.
214346bee4edSPhilip Paeps
214446bee4edSPhilip Paeps    Commentary about historical transitions in Uruguay has been expanded
214546bee4edSPhilip Paeps    with links to many relevant legal documents.
214646bee4edSPhilip Paeps    (Thanks to Tim Parenti.)
214746bee4edSPhilip Paeps
214846bee4edSPhilip Paeps    Commentary now uses some non-ASCII characters with Unicode value
214946bee4edSPhilip Paeps    less than U+0100, as they can be useful and should work even with
215046bee4edSPhilip Paeps    older editors such as XEmacs.
215146bee4edSPhilip Paeps
215246bee4edSPhilip Paeps
2153afb91be3SPhilip PaepsRelease 2018c - 2018-01-22 23:00:44 -0800
2154afb91be3SPhilip Paeps
2155afb91be3SPhilip Paeps  Briefly:
215646bee4edSPhilip Paeps  Revert Irish changes that relied on negative SAVE values.
2157afb91be3SPhilip Paeps
2158afb91be3SPhilip Paeps  Changes to tm_isdst
2159afb91be3SPhilip Paeps
2160afb91be3SPhilip Paeps    Revert the 2018a change to Europe/Dublin.  As before, this change
2161afb91be3SPhilip Paeps    does not affect UT offsets or abbreviations; it affects only
2162afb91be3SPhilip Paeps    whether timestamps are considered to be standard time or
2163afb91be3SPhilip Paeps    daylight-saving time, as expressed in the tm_isdst flag of C's
2164afb91be3SPhilip Paeps    struct tm type.  This reversion is intended to be a temporary
2165afb91be3SPhilip Paeps    workaround for problems discovered with downstream uses of
2166afb91be3SPhilip Paeps    releases 2018a and 2018b, which implemented Irish time by using
216746bee4edSPhilip Paeps    negative SAVE values in the Eire rules of the 'europe' file.
216846bee4edSPhilip Paeps    Although negative SAVE values have been part of tzcode for many
2169afb91be3SPhilip Paeps    years and are supported by many platforms, they were not
2170afb91be3SPhilip Paeps    documented before 2018a and ICU and OpenJDK do not currently
2171afb91be3SPhilip Paeps    support them.  A mechanism to export data to platforms lacking
2172afb91be3SPhilip Paeps    support for negative DST is planned to be developed before the
2173afb91be3SPhilip Paeps    change is reapplied.  (Problems reported by Deborah Goldsmith and
2174afb91be3SPhilip Paeps    Stephen Colebourne.)
2175afb91be3SPhilip Paeps
2176afb91be3SPhilip Paeps  Changes to past timestamps
2177afb91be3SPhilip Paeps
2178afb91be3SPhilip Paeps    Japanese DST transitions (1948-1951) were Sundays at 00:00, not
2179afb91be3SPhilip Paeps    Saturdays or Sundays at 02:00.  (Thanks to Takayuki Nikai.)
2180afb91be3SPhilip Paeps
2181afb91be3SPhilip Paeps  Changes to build procedure
2182afb91be3SPhilip Paeps
2183afb91be3SPhilip Paeps    The build procedure now works around mawk 1.3.3's lack of support
2184afb91be3SPhilip Paeps    for character class expressions.  (Problem reported by Ohyama.)
2185afb91be3SPhilip Paeps
2186afb91be3SPhilip Paeps
2187afb91be3SPhilip PaepsRelease 2018b - 2018-01-17 23:24:48 -0800
2188afb91be3SPhilip Paeps
2189afb91be3SPhilip Paeps  Briefly:
2190afb91be3SPhilip Paeps  Fix a packaging problem in tz2018a, which was missing 'pacificnew'.
2191afb91be3SPhilip Paeps
2192afb91be3SPhilip Paeps  Changes to build procedure
2193afb91be3SPhilip Paeps
2194afb91be3SPhilip Paeps    The distribution now contains the file 'pacificnew' again.
21959f9fc6bbSPhilip Paeps    This file was inadvertently omitted in the 2018a distribution.
2196afb91be3SPhilip Paeps    (Problem reported by Matias Fonzo.)
2197afb91be3SPhilip Paeps
2198afb91be3SPhilip Paeps
2199f2fcff28SPhilip PaepsRelease 2018a - 2018-01-12 22:29:21 -0800
2200f2fcff28SPhilip Paeps
2201f2fcff28SPhilip Paeps  Briefly:
2202f2fcff28SPhilip Paeps  São Tomé and Príncipe switched from +00 to +01.
2203f2fcff28SPhilip Paeps  Brazil's DST will now start on November's first Sunday.
2204f2fcff28SPhilip Paeps  Ireland's standard time is now in the summer, not the winter.
2205f2fcff28SPhilip Paeps  Use Debian-style installation locations, instead of 4.3BSD-style.
2206f2fcff28SPhilip Paeps  New zic option -t.
2207f2fcff28SPhilip Paeps
2208f2fcff28SPhilip Paeps  Changes to past and future timestamps
2209f2fcff28SPhilip Paeps
2210f2fcff28SPhilip Paeps    São Tomé and Príncipe switched from +00 to +01 on 2018-01-01 at
2211f2fcff28SPhilip Paeps    01:00.  (Thanks to Steffen Thorsen and Michael Deckers.)
2212f2fcff28SPhilip Paeps
2213f2fcff28SPhilip Paeps  Changes to future timestamps
2214f2fcff28SPhilip Paeps
2215f2fcff28SPhilip Paeps    Starting in 2018 southern Brazil will begin DST on November's
2216f2fcff28SPhilip Paeps    first Sunday instead of October's third Sunday.  (Thanks to
2217f2fcff28SPhilip Paeps    Steffen Thorsen.)
2218f2fcff28SPhilip Paeps
2219f2fcff28SPhilip Paeps  Changes to past timestamps
2220f2fcff28SPhilip Paeps
2221f2fcff28SPhilip Paeps    A discrepancy of 4 s in timestamps before 1931 in South Sudan has
2222f2fcff28SPhilip Paeps    been corrected.  The 'backzone' and 'zone.tab' files did not agree
2223f2fcff28SPhilip Paeps    with the 'africa' and 'zone1970.tab' files.  (Problem reported by
2224f2fcff28SPhilip Paeps    Michael Deckers.)
2225f2fcff28SPhilip Paeps
2226f2fcff28SPhilip Paeps    The abbreviation invented for Bolivia Summer Time (1931-2) is now
2227f2fcff28SPhilip Paeps    BST instead of BOST, to be more consistent with the convention
2228f2fcff28SPhilip Paeps    used for Latvian Summer Time (1918-9) and for British Summer Time.
2229f2fcff28SPhilip Paeps
2230f2fcff28SPhilip Paeps  Changes to tm_isdst
2231f2fcff28SPhilip Paeps
2232f2fcff28SPhilip Paeps    Change Europe/Dublin so that it observes Irish Standard Time (UT
2233f2fcff28SPhilip Paeps    +01) in summer and GMT (as negative daylight-saving) in winter,
2234f2fcff28SPhilip Paeps    instead of observing standard time (GMT) in winter and Irish
2235f2fcff28SPhilip Paeps    Summer Time (UT +01) in summer.  This change does not affect UT
2236f2fcff28SPhilip Paeps    offsets or abbreviations; it affects only whether timestamps are
2237f2fcff28SPhilip Paeps    considered to be standard time or daylight-saving time, as
2238f2fcff28SPhilip Paeps    expressed in the tm_isdst flag of C's struct tm type.
2239f2fcff28SPhilip Paeps    (Discrepancy noted by Derick Rethans.)
2240f2fcff28SPhilip Paeps
2241f2fcff28SPhilip Paeps  Changes to build procedure
2242f2fcff28SPhilip Paeps
2243f2fcff28SPhilip Paeps    The default installation locations have been changed to mostly
2244f2fcff28SPhilip Paeps    match Debian circa 2017, instead of being designed as an add-on to
2245f2fcff28SPhilip Paeps    4.3BSD circa 1986.  This affects the Makefile macros TOPDIR,
2246f2fcff28SPhilip Paeps    TZDIR, MANDIR, and LIBDIR.  New Makefile macros TZDEFAULT, USRDIR,
2247f2fcff28SPhilip Paeps    USRSHAREDIR, BINDIR, ZDUMPDIR, and ZICDIR let installers tailor
2248f2fcff28SPhilip Paeps    locations more precisely.  (This responds to suggestions from
2249f2fcff28SPhilip Paeps    Brian Inglis and from Steve Summit.)
2250f2fcff28SPhilip Paeps
2251f2fcff28SPhilip Paeps    The default installation procedure no longer creates the
2252f2fcff28SPhilip Paeps    backward-compatibility link US/Pacific-New, which causes
2253f2fcff28SPhilip Paeps    confusion during user setup (e.g., see Debian bug 815200).
2254f2fcff28SPhilip Paeps    Use 'make BACKWARD="backward pacificnew"' to create the link
2255f2fcff28SPhilip Paeps    anyway, for now.  Eventually we plan to remove the link entirely.
2256f2fcff28SPhilip Paeps
2257f2fcff28SPhilip Paeps    tzdata.zi now contains a version-number comment.
2258f2fcff28SPhilip Paeps    (Suggested by Tom Lane.)
2259f2fcff28SPhilip Paeps
2260f2fcff28SPhilip Paeps    The Makefile now quotes values like BACKWARD more carefully when
2261f2fcff28SPhilip Paeps    passing them to the shell.  (Problem reported by Zefram.)
2262f2fcff28SPhilip Paeps
2263f2fcff28SPhilip Paeps    Builders no longer need to specify -DHAVE_SNPRINTF on platforms
2264f2fcff28SPhilip Paeps    that have snprintf and use pre-C99 compilers.  (Problem reported
2265f2fcff28SPhilip Paeps    by Jon Skeet.)
2266f2fcff28SPhilip Paeps
2267f2fcff28SPhilip Paeps  Changes to code
2268f2fcff28SPhilip Paeps
2269f2fcff28SPhilip Paeps    zic has a new option -t FILE that specifies the location of the
2270f2fcff28SPhilip Paeps    file that determines local time when TZ is unset.  The default for
2271f2fcff28SPhilip Paeps    this location can be configured via the new TZDEFAULT makefile
2272f2fcff28SPhilip Paeps    macro, which defaults to /etc/localtime.
2273f2fcff28SPhilip Paeps
2274f2fcff28SPhilip Paeps    Diagnostics and commentary now distinguish UT from UTC more
2275f2fcff28SPhilip Paeps    carefully; see theory.html for more information about UT vs UTC.
2276f2fcff28SPhilip Paeps
2277f2fcff28SPhilip Paeps    zic has been ported to GCC 8's -Wstringop-truncation option.
2278f2fcff28SPhilip Paeps    (Problem reported by Martin Sebor.)
2279f2fcff28SPhilip Paeps
2280f2fcff28SPhilip Paeps  Changes to documentation and commentary
2281f2fcff28SPhilip Paeps
2282f2fcff28SPhilip Paeps    The zic man page now documents the longstanding behavior that
2283f2fcff28SPhilip Paeps    times and years can be out of the usual range, with negative times
2284f2fcff28SPhilip Paeps    counting backwards from midnight and with year 0 preceding year 1.
2285f2fcff28SPhilip Paeps    (Problem reported by Michael Deckers.)
2286f2fcff28SPhilip Paeps
2287f2fcff28SPhilip Paeps    The theory.html file now mentions the POSIX limit of six chars
2288f2fcff28SPhilip Paeps    per abbreviation, and lists alphabetic abbreviations used.
2289f2fcff28SPhilip Paeps
2290f2fcff28SPhilip Paeps    The files tz-art.htm and tz-link.htm have been renamed to
2291f2fcff28SPhilip Paeps    tz-art.html and tz-link.html, respectively, for consistency with
2292f2fcff28SPhilip Paeps    other file names and to simplify web server configuration.
2293f2fcff28SPhilip Paeps
2294f2fcff28SPhilip Paeps
22958d7edd17SPhilip PaepsRelease 2017c - 2017-10-20 14:49:34 -0700
22968d7edd17SPhilip Paeps
22978d7edd17SPhilip Paeps  Briefly:
22988d7edd17SPhilip Paeps  Northern Cyprus switches from +03 to +02/+03 on 2017-10-29.
22998d7edd17SPhilip Paeps  Fiji ends DST 2018-01-14, not 2018-01-21.
23008d7edd17SPhilip Paeps  Namibia switches from +01/+02 to +02 on 2018-04-01.
23018d7edd17SPhilip Paeps  Sudan switches from +03 to +02 on 2017-11-01.
23028d7edd17SPhilip Paeps  Tonga likely switches from +13/+14 to +13 on 2017-11-05.
23038d7edd17SPhilip Paeps  Turks & Caicos switches from -04 to -05/-04 on 2018-11-04.
23048d7edd17SPhilip Paeps  A new file tzdata.zi now holds a small text copy of all data.
23058d7edd17SPhilip Paeps  The zic input format has been regularized slightly.
23068d7edd17SPhilip Paeps
23078d7edd17SPhilip Paeps  Changes to future timestamps
23088d7edd17SPhilip Paeps
23098d7edd17SPhilip Paeps    Northern Cyprus has decided to resume EU rules starting
23108d7edd17SPhilip Paeps    2017-10-29, thus reinstituting winter time.
23118d7edd17SPhilip Paeps
23128d7edd17SPhilip Paeps    Fiji ends DST 2018-01-14 instead of the 2018-01-21 previously
23138d7edd17SPhilip Paeps    predicted.  (Thanks to Dominic Fok.)  Adjust future predictions
23148d7edd17SPhilip Paeps    accordingly.
23158d7edd17SPhilip Paeps
23168d7edd17SPhilip Paeps    Namibia will switch from +01 with DST to +02 all year on
23178d7edd17SPhilip Paeps    2017-09-03 at 02:00.  This affects UT offsets starting 2018-04-01
23188d7edd17SPhilip Paeps    at 02:00.  (Thanks to Steffen Thorsen.)
23198d7edd17SPhilip Paeps
23208d7edd17SPhilip Paeps    Sudan will switch from +03 to +02 on 2017-11-01.  (Thanks to Ahmed
23218d7edd17SPhilip Paeps    Atyya and Yahia Abdalla.)  South Sudan is not switching, so
23228d7edd17SPhilip Paeps    Africa/Juba is no longer a link to Africa/Khartoum.
23238d7edd17SPhilip Paeps
23248d7edd17SPhilip Paeps    Tonga has likely ended its experiment with DST, and will not
23258d7edd17SPhilip Paeps    adjust its clocks on 2017-11-05.  Although Tonga has not announced
23268d7edd17SPhilip Paeps    whether it will continue to observe DST, the IATA is assuming that
23278d7edd17SPhilip Paeps    it will not.  (Thanks to David Wade.)
23288d7edd17SPhilip Paeps
23298d7edd17SPhilip Paeps    Turks & Caicos will switch from -04 all year to -05 with US DST on
23308d7edd17SPhilip Paeps    2018-03-11 at 03:00.  This affects UT offsets starting 2018-11-04
23318d7edd17SPhilip Paeps    at 02:00.  (Thanks to Steffen Thorsen.)
23328d7edd17SPhilip Paeps
23338d7edd17SPhilip Paeps  Changes to past timestamps
23348d7edd17SPhilip Paeps
23358d7edd17SPhilip Paeps    Namibia switched from +02 to +01 on 1994-03-21, not 1994-04-03.
23368d7edd17SPhilip Paeps    (Thanks to Arthur David Olson.)
23378d7edd17SPhilip Paeps
23388d7edd17SPhilip Paeps    Detroit did not observe DST in 1967.
23398d7edd17SPhilip Paeps
23408d7edd17SPhilip Paeps    Use railway time for Asia/Kolkata before 1941, by switching to
23418d7edd17SPhilip Paeps    Madras local time (UT +052110) in 1870, then to IST (UT +0530) in
23428d7edd17SPhilip Paeps    1906.  Also, treat 1941-2's +0630 as DST, like 1942-5.
23438d7edd17SPhilip Paeps
23448d7edd17SPhilip Paeps    Europe/Dublin's 1946 and 1947 fallback transitions occurred at
23458d7edd17SPhilip Paeps    02:00 standard time, not 02:00 DST.  (Thanks to Michael Deckers.)
23468d7edd17SPhilip Paeps
23478d7edd17SPhilip Paeps    Pacific/Apia and Pacific/Pago_Pago switched from Antipodean to
23488d7edd17SPhilip Paeps    American time in 1892, not 1879.  (Thanks to Michael Deckers.)
23498d7edd17SPhilip Paeps
23508d7edd17SPhilip Paeps    Adjust the 1867 transition in Alaska to better reflect the
23518d7edd17SPhilip Paeps    historical record, by changing it to occur on 1867-10-18 at 15:30
23528d7edd17SPhilip Paeps    Sitka time rather than at the start of 1867-10-17 local time.
23538d7edd17SPhilip Paeps    Although strictly speaking this is accurate only for Sitka,
23548d7edd17SPhilip Paeps    the rest of Alaska's blanks need to be filled in somehow.
23558d7edd17SPhilip Paeps
23568d7edd17SPhilip Paeps    Fix off-by-one errors in UT offsets for Adak and Nome before 1867.
23578d7edd17SPhilip Paeps    (Thanks to Michael Deckers.)
23588d7edd17SPhilip Paeps
23598d7edd17SPhilip Paeps    Add 7 s to the UT offset in Asia/Yangon before 1920.
23608d7edd17SPhilip Paeps
23618d7edd17SPhilip Paeps  Changes to zone names
23628d7edd17SPhilip Paeps
23638d7edd17SPhilip Paeps    Remove Canada/East-Saskatchewan from the 'backward' file, as it
23648d7edd17SPhilip Paeps    exceeded the 14-character limit and was an unused misnomer anyway.
23658d7edd17SPhilip Paeps
23668d7edd17SPhilip Paeps  Changes to build procedure
23678d7edd17SPhilip Paeps
23688d7edd17SPhilip Paeps    To support applications that prefer to read time zone data in text
23698d7edd17SPhilip Paeps    form, two zic input files tzdata.zi and leapseconds are now
23708d7edd17SPhilip Paeps    installed by default.  The commands 'zic tzdata.zi' and 'zic -L
23718d7edd17SPhilip Paeps    leapseconds tzdata.zi' can reproduce the tzdata binary files
23728d7edd17SPhilip Paeps    without and with leap seconds, respectively.  To prevent these two
23738d7edd17SPhilip Paeps    new files from being installed, use 'make TZDATA_TEXT=', and to
23748d7edd17SPhilip Paeps    suppress leap seconds from the tzdata text installation, use 'make
23758d7edd17SPhilip Paeps    TZDATA_TEXT=tzdata.zi'.
23768d7edd17SPhilip Paeps
23778d7edd17SPhilip Paeps    'make BACKWARD=' now suppresses backward-compatibility names
23788d7edd17SPhilip Paeps    like 'US/Pacific' that are defined in the 'backward' and
23798d7edd17SPhilip Paeps    'pacificnew' files.
23808d7edd17SPhilip Paeps
23818d7edd17SPhilip Paeps    'make check' now works on systems that lack a UTF-8 locale,
23828d7edd17SPhilip Paeps    or that lack the nsgmls program.  Set UTF8_LOCALE to configure
23838d7edd17SPhilip Paeps    the name of a UTF-8 locale, if you have one.
23848d7edd17SPhilip Paeps
23858d7edd17SPhilip Paeps    Y2K runtime checks are no longer enabled by default.  Add
23868d7edd17SPhilip Paeps    -DDEPRECATE_TWO_DIGIT_YEARS to CFLAGS to enable them, instead of
23878d7edd17SPhilip Paeps    adding -DNO_RUN_TIME_WARNINGS_ABOUT_YEAR_2000_PROBLEMS_THANK_YOU
23888d7edd17SPhilip Paeps    to disable them.  (New name suggested by Brian Inglis.)
23898d7edd17SPhilip Paeps
23908d7edd17SPhilip Paeps    The build procedure for zdump now works on AIX 7.1.
23918d7edd17SPhilip Paeps    (Problem reported by Kees Dekker.)
23928d7edd17SPhilip Paeps
23938d7edd17SPhilip Paeps  Changes to code
23948d7edd17SPhilip Paeps
23958d7edd17SPhilip Paeps    zic and the reference runtime now reject multiple leap seconds
23968d7edd17SPhilip Paeps    within 28 days of each other, or leap seconds before the Epoch.
23978d7edd17SPhilip Paeps    As a result, support for double leap seconds, which was
23988d7edd17SPhilip Paeps    obsolescent and undocumented, has been removed.  Double leap
23998d7edd17SPhilip Paeps    seconds were an error in the C89 standard; they have never existed
24008d7edd17SPhilip Paeps    in civil timekeeping.  (Thanks to Robert Elz and Bradley White for
24018d7edd17SPhilip Paeps    noticing glitches in the code that uncovered this problem.)
24028d7edd17SPhilip Paeps
24038d7edd17SPhilip Paeps    zic now warns about use of the obsolescent and undocumented -y
24048d7edd17SPhilip Paeps    option, and about use of the obsolescent TYPE field of Rule lines.
24058d7edd17SPhilip Paeps
24068d7edd17SPhilip Paeps    zic now allows unambiguous abbreviations like "Sa" and "Su" for
24078d7edd17SPhilip Paeps    weekdays; formerly it rejected them due to a bug.  Conversely, zic
24088d7edd17SPhilip Paeps    no longer considers non-prefixes to be abbreviations; for example,
24098d7edd17SPhilip Paeps    it no longer accepts "lF" as an abbreviation for "lastFriday".
24108d7edd17SPhilip Paeps    Also, zic warns about the undocumented usage with a "last-"
24118d7edd17SPhilip Paeps    prefix, e.g., "last-Fri".
24128d7edd17SPhilip Paeps
24138d7edd17SPhilip Paeps    Similarly, zic now accepts the unambiguous abbreviation "L" for
24148d7edd17SPhilip Paeps    "Link" in ordinary context and for "Leap" in leap-second context.
24158d7edd17SPhilip Paeps    Conversely, zic no longer accepts non-prefixes such as "La" as
24168d7edd17SPhilip Paeps    abbreviations for words like "Leap".
24178d7edd17SPhilip Paeps
24188d7edd17SPhilip Paeps    zic no longer accepts leap second lines in ordinary input, or
24198d7edd17SPhilip Paeps    ordinary lines in leap second input.  Formerly, zic sometimes
24208d7edd17SPhilip Paeps    warned about this undocumented usage and handled it incorrectly.
24218d7edd17SPhilip Paeps
24228d7edd17SPhilip Paeps    The new macro HAVE_TZNAME governs whether the tzname external
24238d7edd17SPhilip Paeps    variable is exported, instead of USG_COMPAT.  USG_COMPAT now
24248d7edd17SPhilip Paeps    governs only the external variables "timezone" and "daylight".
24258d7edd17SPhilip Paeps    This change is needed because the three variables are not in the
24268d7edd17SPhilip Paeps    same category: although POSIX requires tzname, it specifies the
24278d7edd17SPhilip Paeps    other two variables as optional.  Also, USG_COMPAT is now 1 or 0:
24288d7edd17SPhilip Paeps    if not defined, the code attempts to guess it from other macros.
24298d7edd17SPhilip Paeps
24308d7edd17SPhilip Paeps    localtime.c and difftime.c no longer require stdio.h, and .c files
24318d7edd17SPhilip Paeps    other than zic.c no longer require sys/wait.h.
24328d7edd17SPhilip Paeps
24338d7edd17SPhilip Paeps    zdump.c no longer assumes snprintf.  (Reported by Jonathan Leffler.)
24348d7edd17SPhilip Paeps
24358d7edd17SPhilip Paeps    Calculation of time_t extrema works around a bug in GCC 4.8.4
24368d7edd17SPhilip Paeps    (Reported by Stan Shebs and Joseph Myers.)
24378d7edd17SPhilip Paeps
24388d7edd17SPhilip Paeps    zic.c no longer mistranslates formats of line numbers in non-English
24398d7edd17SPhilip Paeps    locales.  (Problem reported by Benno Schulenberg.)
24408d7edd17SPhilip Paeps
24418d7edd17SPhilip Paeps    Several minor changes have been made to the code to make it a
24428d7edd17SPhilip Paeps    bit easier to port to MS-Windows and Solaris.  (Thanks to Kees
24438d7edd17SPhilip Paeps    Dekker for reporting the problems.)
24448d7edd17SPhilip Paeps
24458d7edd17SPhilip Paeps  Changes to documentation and commentary
24468d7edd17SPhilip Paeps
24478d7edd17SPhilip Paeps    The two new files 'theory.html' and 'calendars' contain the
24488d7edd17SPhilip Paeps    contents of the removed file 'Theory'.  The goal is to document
24498d7edd17SPhilip Paeps    tzdb theory more accessibly.
24508d7edd17SPhilip Paeps
24518d7edd17SPhilip Paeps    The zic man page now documents abbreviation rules.
24528d7edd17SPhilip Paeps
24538d7edd17SPhilip Paeps    tz-link.htm now covers how to apply tzdata changes to clients.
24548d7edd17SPhilip Paeps    (Thanks to Jorge Fábregas for the AIX link.)  It also mentions MySQL.
24558d7edd17SPhilip Paeps
24568d7edd17SPhilip Paeps    The leap-seconds.list URL has been updated to something that is
24578d7edd17SPhilip Paeps    more reliable for tzdb.  (Thanks to Tim Parenti and Brian Inglis.)
24588d7edd17SPhilip Paeps
2459dc135c6eSBaptiste DaroussinRelease 2017b - 2017-03-17 07:30:38 -0700
2460dc135c6eSBaptiste Daroussin
2461dc135c6eSBaptiste Daroussin  Briefly: Haiti has resumed DST.
2462dc135c6eSBaptiste Daroussin
2463dc135c6eSBaptiste Daroussin  Changes to past and future timestamps
2464dc135c6eSBaptiste Daroussin
2465dc135c6eSBaptiste Daroussin    Haiti resumed observance of DST in 2017.  (Thanks to Steffen Thorsen.)
2466dc135c6eSBaptiste Daroussin
2467dc135c6eSBaptiste Daroussin  Changes to past timestamps
2468dc135c6eSBaptiste Daroussin
2469dc135c6eSBaptiste Daroussin    Liberia changed from -004430 to +00 on 1972-01-07, not 1972-05-01.
2470dc135c6eSBaptiste Daroussin
2471dc135c6eSBaptiste Daroussin    Use "MMT" to abbreviate Liberia's time zone before 1972, as "-004430"
2472dc135c6eSBaptiste Daroussin    is one byte over the POSIX limit.  (Problem reported by Derick Rethans.)
2473dc135c6eSBaptiste Daroussin
24748d7edd17SPhilip Paeps  Changes to code
24758d7edd17SPhilip Paeps
24768d7edd17SPhilip Paeps    The reference localtime implementation now falls back on the
24778d7edd17SPhilip Paeps    current US daylight-saving transition rules rather than the
24788d7edd17SPhilip Paeps    1987-2006 rules.  This fallback occurs only when (1) the TZ
247989abb9f8SPhilip Paeps    environment variable has a value like "AST4ADT" that asks
24808d7edd17SPhilip Paeps    for daylight saving time but does not specify the rules, (2) there
24818d7edd17SPhilip Paeps    is no file by that name, and (3) the TZDEFRULES file cannot be
24828d7edd17SPhilip Paeps    loaded.  (Thanks to Tom Lane.)
24838d7edd17SPhilip Paeps
2484dc135c6eSBaptiste Daroussin
2485dc135c6eSBaptiste DaroussinRelease 2017a - 2017-02-28 00:05:36 -0800
2486dc135c6eSBaptiste Daroussin
2487dc135c6eSBaptiste Daroussin  Briefly: Southern Chile moves from -04/-03 to -03, and Mongolia
2488dc135c6eSBaptiste Daroussin  discontinues DST.
2489dc135c6eSBaptiste Daroussin
2490dc135c6eSBaptiste Daroussin  Changes to future timestamps
2491dc135c6eSBaptiste Daroussin
2492dc135c6eSBaptiste Daroussin    Mongolia no longer observes DST.  (Thanks to Ganbold Tsagaankhuu.)
2493dc135c6eSBaptiste Daroussin
2494dc135c6eSBaptiste Daroussin    Chile's Region of Magallanes moves from -04/-03 to -03 year-round.
2495dc135c6eSBaptiste Daroussin    Its clocks diverge from America/Santiago starting 2017-05-13 at
2496dc135c6eSBaptiste Daroussin    23:00, hiving off a new zone America/Punta_Arenas.  Although the
2497dc135c6eSBaptiste Daroussin    Chilean government says this change expires in May 2019, for now
2498dc135c6eSBaptiste Daroussin    assume it's permanent.  (Thanks to Juan Correa and Deborah
2499dc135c6eSBaptiste Daroussin    Goldsmith.)  This also affects Antarctica/Palmer.
2500dc135c6eSBaptiste Daroussin
2501dc135c6eSBaptiste Daroussin  Changes to past timestamps
2502dc135c6eSBaptiste Daroussin
2503dc135c6eSBaptiste Daroussin    Fix many entries for historical timestamps for Europe/Madrid
2504dc135c6eSBaptiste Daroussin    before 1979, to agree with tables compiled by Pere Planesas of the
2505dc135c6eSBaptiste Daroussin    National Astronomical Observatory of Spain.  As a side effect,
2506dc135c6eSBaptiste Daroussin    this changes some timestamps for Africa/Ceuta before 1929, which
2507dc135c6eSBaptiste Daroussin    are probably guesswork anyway.  (Thanks to Steve Allen and
2508dc135c6eSBaptiste Daroussin    Pierpaolo Bernardi for the heads-ups, and to Michael Deckers for
2509dc135c6eSBaptiste Daroussin    correcting the 1901 transition.)
2510dc135c6eSBaptiste Daroussin
2511dc135c6eSBaptiste Daroussin    Ecuador observed DST from 1992-11-28 to 1993-02-05.
2512dc135c6eSBaptiste Daroussin    (Thanks to Alois Treindl.)
2513dc135c6eSBaptiste Daroussin
2514dc135c6eSBaptiste Daroussin    Asia/Atyrau and Asia/Oral were at +03 (not +04) before 1930-06-21.
2515dc135c6eSBaptiste Daroussin    (Thanks to Stepan Golosunov.)
2516dc135c6eSBaptiste Daroussin
2517dc135c6eSBaptiste Daroussin  Changes to past and future time zone abbreviations
2518dc135c6eSBaptiste Daroussin
2519dc135c6eSBaptiste Daroussin    Switch to numeric time zone abbreviations for South America, as
2520dc135c6eSBaptiste Daroussin    part of the ongoing project of removing invented abbreviations.
2521dc135c6eSBaptiste Daroussin    This avoids the need to invent an abbreviation for the new Chilean
2522dc135c6eSBaptiste Daroussin    new zone.  Similarly, switch from invented to numeric time zone
2523dc135c6eSBaptiste Daroussin    abbreviations for Afghanistan, American Samoa, the Azores,
2524dc135c6eSBaptiste Daroussin    Bangladesh, Bhutan, the British Indian Ocean Territory, Brunei,
2525dc135c6eSBaptiste Daroussin    Cape Verde, Chatham Is, Christmas I, Cocos (Keeling) Is, Cook Is,
2526dc135c6eSBaptiste Daroussin    Dubai, East Timor, Eucla, Fiji, French Polynesia, Greenland,
2527dc135c6eSBaptiste Daroussin    Indochina, Iran, Iraq, Kiribati, Lord Howe, Macquarie, Malaysia,
2528dc135c6eSBaptiste Daroussin    the Maldives, Marshall Is, Mauritius, Micronesia, Mongolia,
2529dc135c6eSBaptiste Daroussin    Myanmar, Nauru, Nepal, New Caledonia, Niue, Norfolk I, Palau,
2530dc135c6eSBaptiste Daroussin    Papua New Guinea, the Philippines, Pitcairn, Qatar, Réunion, St
2531dc135c6eSBaptiste Daroussin    Pierre & Miquelon, Samoa, Saudi Arabia, Seychelles, Singapore,
2532dc135c6eSBaptiste Daroussin    Solomon Is, Tokelau, Tuvalu, Wake, Vanuatu, Wallis & Futuna, and
2533dc135c6eSBaptiste Daroussin    Xinjiang; for 20-minute daylight saving time in Ghana before 1943;
2534dc135c6eSBaptiste Daroussin    for half-hour daylight saving time in Belize before 1944 and in
2535dc135c6eSBaptiste Daroussin    the Dominican Republic before 1975; and for Canary Islands before
2536dc135c6eSBaptiste Daroussin    1946, for Guinea-Bissau before 1975, for Iceland before 1969, for
2537dc135c6eSBaptiste Daroussin    Indian Summer Time before 1942, for Indonesia before around 1964,
2538dc135c6eSBaptiste Daroussin    for Kenya before 1960, for Liberia before 1973, for Madeira before
2539dc135c6eSBaptiste Daroussin    1967, for Namibia before 1943, for the Netherlands in 1937-9, for
2540dc135c6eSBaptiste Daroussin    Pakistan before 1971, for Western Sahara before 1977, and for
2541dc135c6eSBaptiste Daroussin    Zaporozhye in 1880-1924.
2542dc135c6eSBaptiste Daroussin
2543dc135c6eSBaptiste Daroussin    For Alaska time from 1900 through 1967, instead of "CAT" use the
2544dc135c6eSBaptiste Daroussin    abbreviation "AST", the abbreviation commonly used at the time
2545dc135c6eSBaptiste Daroussin    (Atlantic Standard Time had not been standardized yet).  Use "AWT"
2546dc135c6eSBaptiste Daroussin    and "APT" instead of the invented abbreviations "CAWT" and "CAPT".
2547dc135c6eSBaptiste Daroussin
2548dc135c6eSBaptiste Daroussin    Use "CST" and "CDT" instead of invented abbreviations for Macau
2549dc135c6eSBaptiste Daroussin    before 1999 and Taiwan before 1938, and use "JST" instead of the
2550dc135c6eSBaptiste Daroussin    invented abbreviation "JCST" for Japan and Korea before 1938.
2551dc135c6eSBaptiste Daroussin
2552dc135c6eSBaptiste Daroussin  Change to database entry category
2553dc135c6eSBaptiste Daroussin
2554dc135c6eSBaptiste Daroussin    Move the Pacific/Johnston link from 'australasia' to 'backward',
2555dc135c6eSBaptiste Daroussin    since Johnston is now uninhabited.
2556dc135c6eSBaptiste Daroussin
2557dc135c6eSBaptiste Daroussin  Changes to code
2558dc135c6eSBaptiste Daroussin
2559dc135c6eSBaptiste Daroussin    zic no longer mishandles some transitions in January 2038 when it
2560dc135c6eSBaptiste Daroussin    attempts to work around Qt bug 53071.  This fixes a bug affecting
2561dc135c6eSBaptiste Daroussin    Pacific/Tongatapu that was introduced in zic 2016e.  localtime.c
2562dc135c6eSBaptiste Daroussin    now contains a workaround, useful when loading a file generated by
2563dc135c6eSBaptiste Daroussin    a buggy zic.  (Problem and localtime.c fix reported by Bradley
2564dc135c6eSBaptiste Daroussin    White.)
2565dc135c6eSBaptiste Daroussin
2566dc135c6eSBaptiste Daroussin    zdump -i now outputs non-hour numeric time zone abbreviations
2567dc135c6eSBaptiste Daroussin    without a colon, e.g., "+0530" rather than "+05:30".  This agrees
2568dc135c6eSBaptiste Daroussin    with zic %z and with common practice, and simplifies auditing of
2569dc135c6eSBaptiste Daroussin    zdump output.
2570dc135c6eSBaptiste Daroussin
2571dc135c6eSBaptiste Daroussin    zdump is now buildable again with -DUSE_LTZ=0.
2572dc135c6eSBaptiste Daroussin    (Problem reported by Joseph Myers.)
2573dc135c6eSBaptiste Daroussin
2574dc135c6eSBaptiste Daroussin    zdump.c now always includes private.h, to avoid code duplication
2575dc135c6eSBaptiste Daroussin    with private.h.  (Problem reported by Kees Dekker.)
2576dc135c6eSBaptiste Daroussin
2577dc135c6eSBaptiste Daroussin    localtime.c no longer mishandles early or late timestamps
2578dc135c6eSBaptiste Daroussin    when TZ is set to a POSIX-style string that specifies DST.
2579dc135c6eSBaptiste Daroussin    (Problem reported by Kees Dekker.)
2580dc135c6eSBaptiste Daroussin
2581dc135c6eSBaptiste Daroussin    date and strftime now cause %z to generate "-0000" instead of
2582dc135c6eSBaptiste Daroussin    "+0000" when the UT offset is zero and the time zone abbreviation
2583dc135c6eSBaptiste Daroussin    begins with "-".
2584dc135c6eSBaptiste Daroussin
2585dc135c6eSBaptiste Daroussin  Changes to documentation and commentary
2586dc135c6eSBaptiste Daroussin
2587dc135c6eSBaptiste Daroussin    The 'Theory' file now better documents choice of historical time
2588dc135c6eSBaptiste Daroussin    zone abbreviations.  (Problems reported by Michael Deckers.)
2589dc135c6eSBaptiste Daroussin
2590dc135c6eSBaptiste Daroussin    tz-link.htm now covers leap smearing, which is popular in clouds.
2591dc135c6eSBaptiste Daroussin
2592dc135c6eSBaptiste Daroussin
2593e350c46aSBaptiste DaroussinRelease 2016j - 2016-11-22 23:17:13 -0800
2594e350c46aSBaptiste Daroussin
2595e350c46aSBaptiste Daroussin  Briefly: Saratov, Russia moves from +03 to +04 on 2016-12-04.
2596e350c46aSBaptiste Daroussin
2597e350c46aSBaptiste Daroussin  Changes to future timestamps
2598e350c46aSBaptiste Daroussin
2599e350c46aSBaptiste Daroussin    Saratov, Russia switches from +03 to +04 on 2016-12-04 at 02:00.
2600e350c46aSBaptiste Daroussin    This hives off a new zone Europe/Saratov from Europe/Volgograd.
2601e350c46aSBaptiste Daroussin    (Thanks to Yuri Konotopov and Stepan Golosunov.)
2602e350c46aSBaptiste Daroussin
2603e350c46aSBaptiste Daroussin  Changes to past timestamps
2604e350c46aSBaptiste Daroussin
2605e350c46aSBaptiste Daroussin    The new zone Asia/Atyrau for Atyraū Region, Kazakhstan, is like
2606dc135c6eSBaptiste Daroussin    Asia/Aqtau except it switched from +05/+06 to +04/+05 in spring
2607e350c46aSBaptiste Daroussin    1999, not fall 1994.  (Thanks to Stepan Golosunov.)
2608e350c46aSBaptiste Daroussin
2609e350c46aSBaptiste Daroussin  Changes to past time zone abbreviations
2610e350c46aSBaptiste Daroussin
2611e350c46aSBaptiste Daroussin    Asia/Gaza and Asia/Hebron now use "EEST", not "EET", to denote
2612e350c46aSBaptiste Daroussin    summer time before 1948.  The old use of "EET" was a typo.
2613e350c46aSBaptiste Daroussin
2614e350c46aSBaptiste Daroussin  Changes to code
2615e350c46aSBaptiste Daroussin
2616e350c46aSBaptiste Daroussin    zic no longer mishandles file systems that lack hard links, fixing
2617e350c46aSBaptiste Daroussin    bugs introduced in 2016g.  (Problems reported by Tom Lane.)
2618e350c46aSBaptiste Daroussin    Also, when the destination already contains symbolic links, zic
2619e350c46aSBaptiste Daroussin    should now work better on systems where the 'link' system call
2620e350c46aSBaptiste Daroussin    does not follow symbolic links.
2621e350c46aSBaptiste Daroussin
2622e350c46aSBaptiste Daroussin  Changes to documentation and commentary
2623e350c46aSBaptiste Daroussin
2624e350c46aSBaptiste Daroussin    tz-link.htm now documents the relationship between release version
2625e350c46aSBaptiste Daroussin    numbers and development-repository commit tags.  (Suggested by
2626e350c46aSBaptiste Daroussin    Paul Koning.)
2627e350c46aSBaptiste Daroussin
2628e350c46aSBaptiste Daroussin    The 'Theory' file now documents UT.
2629e350c46aSBaptiste Daroussin
2630e350c46aSBaptiste Daroussin    iso3166.tab now accents "Curaçao", and commentary now mentions
2631e350c46aSBaptiste Daroussin    the names "Cabo Verde" and "Czechia".  (Thanks to Jiří Boháč.)
2632e350c46aSBaptiste Daroussin
2633e350c46aSBaptiste Daroussin
2634ba2b2efdSGlen BarberRelease 2016i - 2016-11-01 23:19:52 -0700
2635ba2b2efdSGlen Barber
2636ba2b2efdSGlen Barber  Briefly: Cyprus split into two time zones on 2016-10-30, and Tonga
2637ba2b2efdSGlen Barber  reintroduces DST on 2016-11-06.
2638ba2b2efdSGlen Barber
2639ba2b2efdSGlen Barber  Changes to future timestamps
2640ba2b2efdSGlen Barber
2641ba2b2efdSGlen Barber    Pacific/Tongatapu begins DST on 2016-11-06 at 02:00, ending on
2642ba2b2efdSGlen Barber    2017-01-15 at 03:00.  Assume future observances in Tonga will be
2643ba2b2efdSGlen Barber    from the first Sunday in November through the third Sunday in
2644ba2b2efdSGlen Barber    January, like Fiji.  (Thanks to Pulu ʻAnau.)  Switch to numeric
2645ba2b2efdSGlen Barber    time zone abbreviations for this zone.
2646ba2b2efdSGlen Barber
2647ba2b2efdSGlen Barber  Changes to past and future timestamps
2648ba2b2efdSGlen Barber
2649ba2b2efdSGlen Barber    Northern Cyprus is now +03 year round, causing a split in Cyprus
2650ba2b2efdSGlen Barber    time zones starting 2016-10-30 at 04:00.  This creates a zone
2651ba2b2efdSGlen Barber    Asia/Famagusta.  (Thanks to Even Scharning and Matt Johnson.)
2652ba2b2efdSGlen Barber
2653ba2b2efdSGlen Barber    Antarctica/Casey switched from +08 to +11 on 2016-10-22.
2654ba2b2efdSGlen Barber    (Thanks to Steffen Thorsen.)
2655ba2b2efdSGlen Barber
2656ba2b2efdSGlen Barber  Changes to past timestamps
2657ba2b2efdSGlen Barber
2658ba2b2efdSGlen Barber    Several corrections were made for pre-1975 timestamps in Italy.
2659ba2b2efdSGlen Barber    These affect Europe/Malta, Europe/Rome, Europe/San_Marino, and
2660ba2b2efdSGlen Barber    Europe/Vatican.
2661ba2b2efdSGlen Barber
2662ba2b2efdSGlen Barber    First, the 1893-11-01 00:00 transition in Italy used the new UT
2663ba2b2efdSGlen Barber    offset (+01), not the old (+00:49:56).  (Thanks to Michael
2664ba2b2efdSGlen Barber    Deckers.)
2665ba2b2efdSGlen Barber
2666ba2b2efdSGlen Barber    Second, rules for daylight saving in Italy were changed to agree
2667ba2b2efdSGlen Barber    with Italy's National Institute of Metrological Research (INRiM)
2668ba2b2efdSGlen Barber    except for 1944, as follows (thanks to Pierpaolo Bernardi, Brian
2669ba2b2efdSGlen Barber    Inglis, and Michael Deckers):
2670ba2b2efdSGlen Barber
2671ba2b2efdSGlen Barber      The 1916-06-03 transition was at 24:00, not 00:00.
2672ba2b2efdSGlen Barber
2673ba2b2efdSGlen Barber      The 1916-10-01, 1919-10-05, and 1920-09-19 transitions were at
2674ba2b2efdSGlen Barber      00:00, not 01:00.
2675ba2b2efdSGlen Barber
2676ba2b2efdSGlen Barber      The 1917-09-30 and 1918-10-06 transitions were at 24:00, not
2677ba2b2efdSGlen Barber      01:00.
2678ba2b2efdSGlen Barber
2679ba2b2efdSGlen Barber      The 1944-09-17 transition was at 03:00, not 01:00.  This
2680ba2b2efdSGlen Barber      particular change is taken from Italian law as INRiM's table,
2681ba2b2efdSGlen Barber      (which says 02:00) appears to have a typo here.  Also, keep the
2682ba2b2efdSGlen Barber      1944-04-03 transition for Europe/Rome, as Rome was controlled by
2683ba2b2efdSGlen Barber      Germany then.
2684ba2b2efdSGlen Barber
2685ba2b2efdSGlen Barber      The 1967-1970 and 1972-1974 fallback transitions were at 01:00,
2686ba2b2efdSGlen Barber      not 00:00.
2687ba2b2efdSGlen Barber
2688ba2b2efdSGlen Barber  Changes to code
2689ba2b2efdSGlen Barber
2690ba2b2efdSGlen Barber    The code should now be buildable on AmigaOS merely by setting the
2691ba2b2efdSGlen Barber    appropriate Makefile variables.  (From a patch by Carsten Larsen.)
2692ba2b2efdSGlen Barber
2693ba2b2efdSGlen Barber
2694ba2b2efdSGlen BarberRelease 2016h - 2016-10-19 23:17:57 -0700
2695ba2b2efdSGlen Barber
2696ba2b2efdSGlen Barber  Changes to future timestamps
2697ba2b2efdSGlen Barber
2698ba2b2efdSGlen Barber    Asia/Gaza and Asia/Hebron end DST on 2016-10-29 at 01:00, not
2699ba2b2efdSGlen Barber    2016-10-21 at 00:00.  (Thanks to Sharef Mustafa.)  Predict that
2700ba2b2efdSGlen Barber    future fall transitions will be on the last Saturday of October
2701ba2b2efdSGlen Barber    at 01:00, which is consistent with predicted spring transitions
2702ba2b2efdSGlen Barber    on the last Saturday of March.  (Thanks to Tim Parenti.)
2703ba2b2efdSGlen Barber
2704ba2b2efdSGlen Barber  Changes to past timestamps
2705ba2b2efdSGlen Barber
2706ba2b2efdSGlen Barber    In Turkey, transitions in 1986-1990 were at 01:00 standard time
2707ba2b2efdSGlen Barber    not at 02:00, and the spring 1994 transition was on March 20, not
2708ba2b2efdSGlen Barber    March 27.  (Thanks to Kıvanç Yazan.)
2709ba2b2efdSGlen Barber
2710ba2b2efdSGlen Barber  Changes to past and future time zone abbreviations
2711ba2b2efdSGlen Barber
2712ba2b2efdSGlen Barber    Asia/Colombo now uses numeric time zone abbreviations like "+0530"
2713ba2b2efdSGlen Barber    instead of alphabetic ones like "IST" and "LKT".  Various
2714ba2b2efdSGlen Barber    English-language sources use "IST", "LKT" and "SLST", with no
2715ba2b2efdSGlen Barber    working consensus.  (Usage of "SLST" mentioned by Sadika
2716ba2b2efdSGlen Barber    Sumanapala.)
2717ba2b2efdSGlen Barber
2718ba2b2efdSGlen Barber  Changes to code
2719ba2b2efdSGlen Barber
2720ba2b2efdSGlen Barber    zic no longer mishandles relativizing file names when creating
2721ba2b2efdSGlen Barber    symbolic links like /etc/localtime, when these symbolic links
2722ba2b2efdSGlen Barber    are outside the usual directory hierarchy.  This fixes a bug
2723ba2b2efdSGlen Barber    introduced in 2016g.  (Problem reported by Andreas Stieger.)
2724ba2b2efdSGlen Barber
2725ba2b2efdSGlen Barber  Changes to build procedure
2726ba2b2efdSGlen Barber
2727ba2b2efdSGlen Barber    New rules 'traditional_tarballs' and 'traditional_signatures' for
2728ba2b2efdSGlen Barber    building just the traditional-format distribution.  (Requested by
2729ba2b2efdSGlen Barber    Deborah Goldsmith.)
2730ba2b2efdSGlen Barber
2731ba2b2efdSGlen Barber    The file 'version' is now put into the tzdata tarball too.
2732ba2b2efdSGlen Barber    (Requested by Howard Hinnant.)
2733ba2b2efdSGlen Barber
2734ba2b2efdSGlen Barber  Changes to documentation and commentary
2735ba2b2efdSGlen Barber
2736ba2b2efdSGlen Barber    The 'Theory' file now has a section on interface stability.
2737ba2b2efdSGlen Barber    (Requested by Paul Koning.)  It also mentions features like
2738ba2b2efdSGlen Barber    tm_zone and localtime_rz that have long been supported by the
2739ba2b2efdSGlen Barber    reference code.
2740ba2b2efdSGlen Barber
2741ba2b2efdSGlen Barber    tz-link.htm has improved coverage of time zone boundaries suitable
2742ba2b2efdSGlen Barber    for geolocation.  (Thanks to heads-ups from Evan Siroky and Matt
2743ba2b2efdSGlen Barber    Johnson.)
2744ba2b2efdSGlen Barber
2745ba2b2efdSGlen Barber    The US commentary now mentions Allen and the "day of two noons".
2746ba2b2efdSGlen Barber
2747ba2b2efdSGlen Barber    The Fiji commentary mentions the government's 2016-10-03 press
2748ba2b2efdSGlen Barber    release.  (Thanks to Raymond Kumar.)
2749ba2b2efdSGlen Barber
2750ba2b2efdSGlen Barber
2751ba2b2efdSGlen BarberRelease 2016g - 2016-09-13 08:56:38 -0700
2752ba2b2efdSGlen Barber
2753ba2b2efdSGlen Barber  Changes to future timestamps
2754ba2b2efdSGlen Barber
2755ba2b2efdSGlen Barber    Turkey switched from EET/EEST (+02/+03) to permanent +03,
2756ba2b2efdSGlen Barber    effective 2016-09-07.  (Thanks to Burak AYDIN.)  Use "+03" rather
2757ba2b2efdSGlen Barber    than an invented abbreviation for the new time.
2758ba2b2efdSGlen Barber
2759ba2b2efdSGlen Barber    New leap second 2016-12-31 23:59:60 UTC as per IERS Bulletin C 52.
2760ba2b2efdSGlen Barber    (Thanks to Tim Parenti.)
2761ba2b2efdSGlen Barber
2762ba2b2efdSGlen Barber  Changes to past timestamps
2763ba2b2efdSGlen Barber
2764ba2b2efdSGlen Barber    For America/Los_Angeles, spring-forward transition times have been
2765ba2b2efdSGlen Barber    corrected from 02:00 to 02:01 in 1948, and from 02:00 to 01:00 in
2766ba2b2efdSGlen Barber    1950-1966.
2767ba2b2efdSGlen Barber
2768ba2b2efdSGlen Barber    For zones using Soviet time on 1919-07-01, transitions to UT-based
2769ba2b2efdSGlen Barber    time were at 00:00 UT, not at 02:00 local time.  The affected
2770ba2b2efdSGlen Barber    zones are Europe/Kirov, Europe/Moscow, Europe/Samara, and
2771ba2b2efdSGlen Barber    Europe/Ulyanovsk.  (Thanks to Alexander Belopolsky.)
2772ba2b2efdSGlen Barber
2773ba2b2efdSGlen Barber  Changes to past and future time zone abbreviations
2774ba2b2efdSGlen Barber
2775ba2b2efdSGlen Barber    The Factory zone now uses the time zone abbreviation -00 instead
2776ba2b2efdSGlen Barber    of a long English-language string, as -00 is now the normal way to
2777ba2b2efdSGlen Barber    represent an undefined time zone.
2778ba2b2efdSGlen Barber
2779ba2b2efdSGlen Barber    Several zones in Antarctica and the former Soviet Union, along
2780ba2b2efdSGlen Barber    with zones intended for ships at sea that cannot use POSIX TZ
2781ba2b2efdSGlen Barber    strings, now use numeric time zone abbreviations instead of
2782ba2b2efdSGlen Barber    invented or obsolete alphanumeric abbreviations.  The affected
2783ba2b2efdSGlen Barber    zones are Antarctica/Casey, Antarctica/Davis,
2784ba2b2efdSGlen Barber    Antarctica/DumontDUrville, Antarctica/Mawson, Antarctica/Rothera,
2785ba2b2efdSGlen Barber    Antarctica/Syowa, Antarctica/Troll, Antarctica/Vostok,
2786ba2b2efdSGlen Barber    Asia/Anadyr, Asia/Ashgabat, Asia/Baku, Asia/Bishkek, Asia/Chita,
2787ba2b2efdSGlen Barber    Asia/Dushanbe, Asia/Irkutsk, Asia/Kamchatka, Asia/Khandyga,
2788ba2b2efdSGlen Barber    Asia/Krasnoyarsk, Asia/Magadan, Asia/Omsk, Asia/Sakhalin,
2789ba2b2efdSGlen Barber    Asia/Samarkand, Asia/Srednekolymsk, Asia/Tashkent, Asia/Tbilisi,
2790ba2b2efdSGlen Barber    Asia/Ust-Nera, Asia/Vladivostok, Asia/Yakutsk, Asia/Yekaterinburg,
2791ba2b2efdSGlen Barber    Asia/Yerevan, Etc/GMT-14, Etc/GMT-13, Etc/GMT-12, Etc/GMT-11,
2792ba2b2efdSGlen Barber    Etc/GMT-10, Etc/GMT-9, Etc/GMT-8, Etc/GMT-7, Etc/GMT-6, Etc/GMT-5,
2793ba2b2efdSGlen Barber    Etc/GMT-4, Etc/GMT-3, Etc/GMT-2, Etc/GMT-1, Etc/GMT+1, Etc/GMT+2,
2794ba2b2efdSGlen Barber    Etc/GMT+3, Etc/GMT+4, Etc/GMT+5, Etc/GMT+6, Etc/GMT+7, Etc/GMT+8,
2795ba2b2efdSGlen Barber    Etc/GMT+9, Etc/GMT+10, Etc/GMT+11, Etc/GMT+12, Europe/Kaliningrad,
2796ba2b2efdSGlen Barber    Europe/Minsk, Europe/Samara, Europe/Volgograd, and
2797ba2b2efdSGlen Barber    Indian/Kerguelen.  For Europe/Moscow the invented abbreviation MSM
2798ba2b2efdSGlen Barber    was replaced by +05, whereas MSK and MSD were kept as they are not
2799ba2b2efdSGlen Barber    our invention and are widely used.
2800ba2b2efdSGlen Barber
2801ba2b2efdSGlen Barber  Changes to zone names
2802ba2b2efdSGlen Barber
2803ba2b2efdSGlen Barber    Rename Asia/Rangoon to Asia/Yangon, with a backward compatibility link.
2804ba2b2efdSGlen Barber    (Thanks to David Massoud.)
2805ba2b2efdSGlen Barber
2806ba2b2efdSGlen Barber  Changes to code
2807ba2b2efdSGlen Barber
2808ba2b2efdSGlen Barber    zic no longer generates binary files containing POSIX TZ-like
2809ba2b2efdSGlen Barber    strings that disagree with the local time type after the last
2810ba2b2efdSGlen Barber    explicit transition in the data.  This fixes a bug with
281189abb9f8SPhilip Paeps    Africa/Casablanca and Africa/El_Aaiun in some year-2037 timestamps
281289abb9f8SPhilip Paeps    on the reference platform.  (Thanks to Alexander Belopolsky for
281389abb9f8SPhilip Paeps    reporting the bug and suggesting a way forward.)
2814ba2b2efdSGlen Barber
2815ba2b2efdSGlen Barber    If the installed localtime and/or posixrules files are symbolic
2816ba2b2efdSGlen Barber    links, zic now keeps them symbolic links when updating them, for
2817ba2b2efdSGlen Barber    compatibility with platforms like OpenSUSE where other programs
2818ba2b2efdSGlen Barber    configure these files as symlinks.
2819ba2b2efdSGlen Barber
2820ba2b2efdSGlen Barber    zic now avoids hard linking to symbolic links, avoids some
2821ba2b2efdSGlen Barber    unnecessary mkdir and stat system calls, and uses shorter file
2822ba2b2efdSGlen Barber    names internally.
2823ba2b2efdSGlen Barber
2824ba2b2efdSGlen Barber    zdump has a new -i option to generate transitions in a
2825259e2ad7SPhilip Paeps    smaller but still human-readable format.  This option is
2826ba2b2efdSGlen Barber    experimental, and the output format may change in future versions.
2827ba2b2efdSGlen Barber    (Thanks to Jon Skeet for suggesting that an option was needed,
2828ba2b2efdSGlen Barber    and thanks to Tim Parenti and Chris Rovick for further comments.)
2829ba2b2efdSGlen Barber
2830ba2b2efdSGlen Barber  Changes to build procedure
2831ba2b2efdSGlen Barber
2832ba2b2efdSGlen Barber    An experimental distribution format is available, in addition
2833ba2b2efdSGlen Barber    to the traditional format which will continue to be distributed.
2834ba2b2efdSGlen Barber    The new format is a tarball tzdb-VERSION.tar.lz with signature
2835ba2b2efdSGlen Barber    file tzdb-VERSION.tar.lz.asc.  It unpacks to a top-level directory
2836ba2b2efdSGlen Barber    tzdb-VERSION containing the code and data of the traditional
2837ba2b2efdSGlen Barber    two-tarball format, along with extra data that may be useful.
2838ba2b2efdSGlen Barber    (Thanks to Antonio Diaz Diaz, Oscar van Vlijmen, and many others
2839ba2b2efdSGlen Barber    for comments about the experimental format.)
2840ba2b2efdSGlen Barber
2841ba2b2efdSGlen Barber    The release version number is now more accurate in the usual case
2842ba2b2efdSGlen Barber    where releases are built from a Git repository.  For example, if
2843ba2b2efdSGlen Barber    23 commits and some working-file changes have been made since
2844ba2b2efdSGlen Barber    release 2016g, the version number is now something like
2845ba2b2efdSGlen Barber    '2016g-23-g50556e3-dirty' instead of the misleading '2016g'.
2846e350c46aSBaptiste Daroussin    Tagged releases use the same version number format as before,
2847259e2ad7SPhilip Paeps    e.g., '2016g'.  To support the more accurate version number, its
2848ba2b2efdSGlen Barber    specification has moved from a line in the Makefile to a new
2849ba2b2efdSGlen Barber    source file 'version'.
2850ba2b2efdSGlen Barber
2851ba2b2efdSGlen Barber    The experimental distribution contains a file to2050.tzs that
2852ba2b2efdSGlen Barber    contains what should be the output of 'zdump -i -c 2050' on
2853ba2b2efdSGlen Barber    primary zones.  If this file is available, 'make check' now checks
2854ba2b2efdSGlen Barber    that zdump generates this output.
2855ba2b2efdSGlen Barber
2856ba2b2efdSGlen Barber    'make check_web' now works on Fedora-like distributions.
2857ba2b2efdSGlen Barber
2858ba2b2efdSGlen Barber  Changes to documentation and commentary
2859ba2b2efdSGlen Barber
2860ba2b2efdSGlen Barber    tzfile.5 now documents the new restriction on POSIX TZ-like
2861ba2b2efdSGlen Barber    strings that is now implemented by zic.
2862ba2b2efdSGlen Barber
2863ba2b2efdSGlen Barber    Comments now cite URLs for some 1917-1921 Russian DST decrees.
2864ba2b2efdSGlen Barber    (Thanks to Alexander Belopolsky.)
2865ba2b2efdSGlen Barber
2866ba2b2efdSGlen Barber    tz-link.htm mentions JuliaTime (thanks to Curtis Vogt) and Time4J
2867ba2b2efdSGlen Barber    (thanks to Meno Hochschild) and ThreeTen-Extra, and its
2868ba2b2efdSGlen Barber    description of Java 8 has been brought up to date (thanks to
2869ba2b2efdSGlen Barber    Stephen Colebourne).  Its description of local time on Mars has
2870ba2b2efdSGlen Barber    been updated to match current practice, and URLs have been updated
2871ba2b2efdSGlen Barber    and some obsolete ones removed.
2872ba2b2efdSGlen Barber
2873ba2b2efdSGlen Barber
2874ba2b2efdSGlen BarberRelease 2016f - 2016-07-05 16:26:51 +0200
2875ba2b2efdSGlen Barber
2876ba2b2efdSGlen Barber  Changes affecting future timestamps
2877ba2b2efdSGlen Barber
2878ba2b2efdSGlen Barber    The Egyptian government changed its mind on short notice, and
2879ba2b2efdSGlen Barber    Africa/Cairo will not introduce DST starting 2016-07-07 after all.
2880ba2b2efdSGlen Barber    (Thanks to Mina Samuel.)
2881ba2b2efdSGlen Barber
2882ba2b2efdSGlen Barber    Asia/Novosibirsk switches from +06 to +07 on 2016-07-24 at 02:00.
2883ba2b2efdSGlen Barber    (Thanks to Stepan Golosunov.)
2884ba2b2efdSGlen Barber
2885ba2b2efdSGlen Barber  Changes to past and future timestamps
2886ba2b2efdSGlen Barber
2887ba2b2efdSGlen Barber    Asia/Novokuznetsk and Asia/Novosibirsk now use numeric time zone
2888ba2b2efdSGlen Barber    abbreviations instead of invented ones.
2889ba2b2efdSGlen Barber
2890ba2b2efdSGlen Barber  Changes affecting past timestamps
2891ba2b2efdSGlen Barber
2892ba2b2efdSGlen Barber    Europe/Minsk's 1992-03-29 spring-forward transition was at 02:00 not 00:00.
2893ba2b2efdSGlen Barber    (Thanks to Stepan Golosunov.)
2894ba2b2efdSGlen Barber
2895ba2b2efdSGlen Barber
2896ba2b2efdSGlen BarberRelease 2016e - 2016-06-14 08:46:16 -0700
2897ba2b2efdSGlen Barber
2898ba2b2efdSGlen Barber  Changes affecting future timestamps
2899ba2b2efdSGlen Barber
2900ba2b2efdSGlen Barber    Africa/Cairo observes DST in 2016 from July 7 to the end of October.
2901ba2b2efdSGlen Barber    Guess October 27 and 24:00 transitions.  (Thanks to Steffen Thorsen.)
2902ba2b2efdSGlen Barber    For future years, guess April's last Thursday to October's last
2903ba2b2efdSGlen Barber    Thursday except for Ramadan.
2904ba2b2efdSGlen Barber
2905ba2b2efdSGlen Barber  Changes affecting past timestamps
2906ba2b2efdSGlen Barber
2907ba2b2efdSGlen Barber    Locations while uninhabited now use '-00', not 'zzz', as a
2908ba2b2efdSGlen Barber    placeholder time zone abbreviation.  This is inspired by Internet
2909ba2b2efdSGlen Barber    RFC 3339 and is more consistent with numeric time zone
2910ba2b2efdSGlen Barber    abbreviations already used elsewhere.  The change affects several
2911ba2b2efdSGlen Barber    arctic and antarctic locations, e.g., America/Cambridge_Bay before
2912ba2b2efdSGlen Barber    1920 and Antarctica/Troll before 2005.
2913ba2b2efdSGlen Barber
2914ba2b2efdSGlen Barber    Asia/Baku's 1992-09-27 transition from +04 (DST) to +04 (non-DST) was
2915ba2b2efdSGlen Barber    at 03:00, not 23:00 the previous day.  (Thanks to Michael Deckers.)
2916ba2b2efdSGlen Barber
2917ba2b2efdSGlen Barber  Changes to code
2918ba2b2efdSGlen Barber
2919ba2b2efdSGlen Barber    zic now outputs a dummy transition at time 2**31 - 1 in zones
2920ba2b2efdSGlen Barber    whose POSIX-style TZ strings contain a '<'.  This mostly works
2921ba2b2efdSGlen Barber    around Qt bug 53071 <https://bugreports.qt.io/browse/QTBUG-53071>.
2922ba2b2efdSGlen Barber    (Thanks to Zhanibek Adilbekov for reporting the Qt bug.)
2923ba2b2efdSGlen Barber
2924ba2b2efdSGlen Barber  Changes affecting documentation and commentary
2925ba2b2efdSGlen Barber
2926ba2b2efdSGlen Barber    tz-link.htm says why governments should give plenty of notice for
2927ba2b2efdSGlen Barber    time zone or DST changes, and refers to Matt Johnson's blog post.
2928ba2b2efdSGlen Barber
2929ba2b2efdSGlen Barber    tz-link.htm mentions Tzdata for Elixir.  (Thanks to Matt Johnson.)
2930ba2b2efdSGlen Barber
2931ba2b2efdSGlen Barber
2932ba2b2efdSGlen BarberRelease 2016d - 2016-04-17 22:50:29 -0700
2933ba2b2efdSGlen Barber
2934ba2b2efdSGlen Barber  Changes affecting future timestamps
2935ba2b2efdSGlen Barber
2936ba2b2efdSGlen Barber    America/Caracas switches from -0430 to -04 on 2016-05-01 at 02:30.
2937ba2b2efdSGlen Barber    (Thanks to Alexander Krivenyshev for the heads-up.)
2938ba2b2efdSGlen Barber
2939ba2b2efdSGlen Barber    Asia/Magadan switches from +10 to +11 on 2016-04-24 at 02:00.
2940ba2b2efdSGlen Barber    (Thanks to Alexander Krivenyshev and Matt Johnson.)
2941ba2b2efdSGlen Barber
2942ba2b2efdSGlen Barber    New zone Asia/Tomsk, split off from Asia/Novosibirsk.  It covers
2943ba2b2efdSGlen Barber    Tomsk Oblast, Russia, which switches from +06 to +07 on 2016-05-29
2944ba2b2efdSGlen Barber    at 02:00.  (Thanks to Stepan Golosunov.)
2945ba2b2efdSGlen Barber
2946ba2b2efdSGlen Barber  Changes affecting past timestamps
2947ba2b2efdSGlen Barber
2948ba2b2efdSGlen Barber    New zone Europe/Kirov, split off from Europe/Volgograd.  It covers
2949ba2b2efdSGlen Barber    Kirov Oblast, Russia, which switched from +04/+05 to +03/+04 on
2950ba2b2efdSGlen Barber    1989-03-26 at 02:00, roughly a year after Europe/Volgograd made
2951ba2b2efdSGlen Barber    the same change.  (Thanks to Stepan Golosunov.)
2952ba2b2efdSGlen Barber
2953ba2b2efdSGlen Barber    Russia and nearby locations had daylight-saving transitions on
2954ba2b2efdSGlen Barber    1992-03-29 at 02:00 and 1992-09-27 at 03:00, instead of on
2955ba2b2efdSGlen Barber    1992-03-28 at 23:00 and 1992-09-26 at 23:00.  (Thanks to Stepan
2956ba2b2efdSGlen Barber    Golosunov.)
2957ba2b2efdSGlen Barber
2958ba2b2efdSGlen Barber    Many corrections to historical time in Kazakhstan from 1991
2959ba2b2efdSGlen Barber    through 2005.  (Thanks to Stepan Golosunov.)  Replace Kazakhstan's
2960ba2b2efdSGlen Barber    invented time zone abbreviations with numeric abbreviations.
2961ba2b2efdSGlen Barber
2962ba2b2efdSGlen Barber  Changes to commentary
2963ba2b2efdSGlen Barber
2964ba2b2efdSGlen Barber    Mention Internet RFCs 7808 (TZDIST) and 7809 (CalDAV time zone references).
2965ba2b2efdSGlen Barber
2966ba2b2efdSGlen Barber
2967ba2b2efdSGlen BarberRelease 2016c - 2016-03-23 00:51:27 -0700
2968ba2b2efdSGlen Barber
2969ba2b2efdSGlen Barber  Changes affecting future timestamps
2970ba2b2efdSGlen Barber
2971ba2b2efdSGlen Barber    Azerbaijan no longer observes DST.  (Thanks to Steffen Thorsen.)
2972ba2b2efdSGlen Barber
2973ba2b2efdSGlen Barber    Chile reverts from permanent to seasonal DST.  (Thanks to Juan
2974ba2b2efdSGlen Barber    Correa for the heads-up, and to Tim Parenti for corrections.)
2975ba2b2efdSGlen Barber    Guess that future transitions are August's and May's second
2976ba2b2efdSGlen Barber    Saturdays at 24:00 mainland time.  Also, call the period from
2977ba2b2efdSGlen Barber    2014-09-07 through 2016-05-14 daylight saving time instead of
2978ba2b2efdSGlen Barber    standard time, as that seems more appropriate now.
2979ba2b2efdSGlen Barber
2980ba2b2efdSGlen Barber  Changes affecting past timestamps
2981ba2b2efdSGlen Barber
2982ba2b2efdSGlen Barber    Europe/Kaliningrad and Europe/Vilnius changed from +03/+04 to
2983ba2b2efdSGlen Barber    +02/+03 on 1989-03-26, not 1991-03-31.  Europe/Volgograd changed
2984ba2b2efdSGlen Barber    from +04/+05 to +03/+04 on 1988-03-27, not 1989-03-26.
2985ba2b2efdSGlen Barber    (Thanks to Stepan Golosunov.)
2986ba2b2efdSGlen Barber
2987ba2b2efdSGlen Barber  Changes to commentary
2988ba2b2efdSGlen Barber
2989ba2b2efdSGlen Barber    Several updates and URLs for historical and proposed Russian changes.
2990ba2b2efdSGlen Barber    (Thanks to Stepan Golosunov, Matt Johnson, and Alexander Krivenyshev.)
2991ba2b2efdSGlen Barber
2992ba2b2efdSGlen Barber
2993ba2b2efdSGlen BarberRelease 2016b - 2016-03-12 17:30:14 -0800
2994ba2b2efdSGlen Barber
2995ba2b2efdSGlen Barber  Compatibility note
2996ba2b2efdSGlen Barber
2997ba2b2efdSGlen Barber    Starting with release 2016b, some data entries cause zic implementations
2998ba2b2efdSGlen Barber    derived from tz releases 2005j through 2015e to issue warnings like
2999ba2b2efdSGlen Barber    "time zone abbreviation differs from POSIX standard (+03)".
3000ba2b2efdSGlen Barber    These warnings should not otherwise affect zic's output and can safely be
3001ba2b2efdSGlen Barber    ignored on today's platforms, as the warnings refer to a restriction in
3002ba2b2efdSGlen Barber    POSIX.1-1988 that was removed in POSIX.1-2001.  One way to suppress the
3003ba2b2efdSGlen Barber    warnings is to upgrade to zic derived from tz releases 2015f and later.
3004ba2b2efdSGlen Barber
3005ba2b2efdSGlen Barber  Changes affecting future timestamps
3006ba2b2efdSGlen Barber
3007ba2b2efdSGlen Barber    New zones Europe/Astrakhan and Europe/Ulyanovsk for Astrakhan and
3008ba2b2efdSGlen Barber    Ulyanovsk Oblasts, Russia, both of which will switch from +03 to +04 on
3009ba2b2efdSGlen Barber    2016-03-27 at 02:00 local time.  They need distinct zones since their
3010ba2b2efdSGlen Barber    post-1970 histories disagree.  New zone Asia/Barnaul for Altai Krai and
3011ba2b2efdSGlen Barber    Altai Republic, Russia, which will switch from +06 to +07 on the same date
3012ba2b2efdSGlen Barber    and local time.  The Astrakhan change is already official; the others have
3013ba2b2efdSGlen Barber    passed the first reading in the State Duma and are extremely likely.
3014ba2b2efdSGlen Barber    Also, Asia/Sakhalin moves from +10 to +11 on 2016-03-27 at 02:00.
3015ba2b2efdSGlen Barber    (Thanks to Alexander Krivenyshev for the heads-up, and to Matt Johnson
3016ba2b2efdSGlen Barber    and Stepan Golosunov for followup.)
3017ba2b2efdSGlen Barber
3018ba2b2efdSGlen Barber    As a trial of a new system that needs less information to be made up,
3019ba2b2efdSGlen Barber    the new zones use numeric time zone abbreviations like "+04"
3020ba2b2efdSGlen Barber    instead of invented abbreviations like "ASTT".
3021ba2b2efdSGlen Barber
3022ba2b2efdSGlen Barber    Haiti will not observe DST in 2016.  (Thanks to Jean Antoine via
3023ba2b2efdSGlen Barber    Steffen Thorsen.)
3024ba2b2efdSGlen Barber
3025ba2b2efdSGlen Barber    Palestine's spring-forward transition on 2016-03-26 is at 01:00, not 00:00.
3026ba2b2efdSGlen Barber    (Thanks to Hannah Kreitem.) Guess future transitions will be March's last
3027ba2b2efdSGlen Barber    Saturday at 01:00, not March's last Friday at 24:00.
3028ba2b2efdSGlen Barber
3029ba2b2efdSGlen Barber  Changes affecting past timestamps
3030ba2b2efdSGlen Barber
3031ba2b2efdSGlen Barber    Europe/Chisinau observed DST during 1990, and switched from +04 to
3032ba2b2efdSGlen Barber    +03 at 1990-05-06 02:00, instead of switching from +03 to +02.
3033ba2b2efdSGlen Barber    (Thanks to Stepan Golosunov.)
3034ba2b2efdSGlen Barber
3035ba2b2efdSGlen Barber    1991 abbreviations in Europe/Samara should be SAMT/SAMST, not
3036ba2b2efdSGlen Barber    KUYT/KUYST.  (Thanks to Stepan Golosunov.)
3037ba2b2efdSGlen Barber
3038ba2b2efdSGlen Barber  Changes to code
3039ba2b2efdSGlen Barber
3040ba2b2efdSGlen Barber    tzselect's diagnostics and checking, and checktab.awk's checking,
3041ba2b2efdSGlen Barber    have been improved.  (Thanks to J William Piggott.)
3042ba2b2efdSGlen Barber
3043ba2b2efdSGlen Barber    tzcode now builds under MinGW.  (Thanks to Ian Abbott and Esben Haabendal.)
3044ba2b2efdSGlen Barber
3045ba2b2efdSGlen Barber    tzselect now tests Julian-date TZ settings more accurately.
3046ba2b2efdSGlen Barber    (Thanks to J William Piggott.)
3047ba2b2efdSGlen Barber
3048ba2b2efdSGlen Barber  Changes to commentary
3049ba2b2efdSGlen Barber
3050ba2b2efdSGlen Barber    Comments in zone tables have been improved.  (Thanks to J William Piggott.)
3051ba2b2efdSGlen Barber
3052ba2b2efdSGlen Barber    tzselect again limits its menu comments so that menus fit on a
305346bee4edSPhilip Paeps    24×80 alphanumeric display.
3054ba2b2efdSGlen Barber
3055ba2b2efdSGlen Barber    A new web page tz-how-to.html.  (Thanks to Bill Seymour.)
3056ba2b2efdSGlen Barber
3057ba2b2efdSGlen Barber    In the Theory file, the description of possible time zone abbreviations in
3058ba2b2efdSGlen Barber    tzdata has been cleaned up, as the old description was unclear and
3059ba2b2efdSGlen Barber    inconsistent.  (Thanks to Alain Mouette for reporting the problem.)
3060ba2b2efdSGlen Barber
3061ba2b2efdSGlen Barber
3062ba2b2efdSGlen BarberRelease 2016a - 2016-01-26 23:28:02 -0800
3063ba2b2efdSGlen Barber
3064ba2b2efdSGlen Barber  Changes affecting future timestamps
3065ba2b2efdSGlen Barber
3066ba2b2efdSGlen Barber    America/Cayman will not observe daylight saving this year after all.
3067ba2b2efdSGlen Barber    Revert our guess that it would.  (Thanks to Matt Johnson.)
3068ba2b2efdSGlen Barber
3069ba2b2efdSGlen Barber    Asia/Chita switches from +0800 to +0900 on 2016-03-27 at 02:00.
3070ba2b2efdSGlen Barber    (Thanks to Alexander Krivenyshev.)
3071ba2b2efdSGlen Barber
3072ba2b2efdSGlen Barber    Asia/Tehran now has DST predictions for the year 2038 and later,
3073ba2b2efdSGlen Barber    to be March 21 00:00 to September 21 00:00.  This is likely better
3074ba2b2efdSGlen Barber    than predicting no DST, albeit off by a day every now and then.
3075ba2b2efdSGlen Barber
3076ba2b2efdSGlen Barber  Changes affecting past and future timestamps
3077ba2b2efdSGlen Barber
3078ba2b2efdSGlen Barber    America/Metlakatla switched from PST all year to AKST/AKDT on
3079ba2b2efdSGlen Barber    2015-11-01 at 02:00.  (Thanks to Steffen Thorsen.)
3080ba2b2efdSGlen Barber
3081ba2b2efdSGlen Barber    America/Santa_Isabel has been removed, and replaced with a
3082ba2b2efdSGlen Barber    backward compatibility link to America/Tijuana.  Its contents were
3083ba2b2efdSGlen Barber    apparently based on a misreading of Mexican legislation.
3084ba2b2efdSGlen Barber
3085ba2b2efdSGlen Barber  Changes affecting past timestamps
3086ba2b2efdSGlen Barber
3087ba2b2efdSGlen Barber    Asia/Karachi's two transition times in 2002 were off by a minute.
3088ba2b2efdSGlen Barber    (Thanks to Matt Johnson.)
3089ba2b2efdSGlen Barber
3090ba2b2efdSGlen Barber  Changes affecting build procedure
3091ba2b2efdSGlen Barber
3092ba2b2efdSGlen Barber    An installer can now combine leap seconds with use of the backzone file,
3093ba2b2efdSGlen Barber    e.g., with 'make PACKRATDATA=backzone REDO=posix_right zones'.
3094ba2b2efdSGlen Barber    The old 'make posix_packrat' rule is now marked as obsolescent.
3095ba2b2efdSGlen Barber    (Thanks to Ian Abbott for an initial implementation.)
3096ba2b2efdSGlen Barber
3097ba2b2efdSGlen Barber  Changes affecting documentation and commentary
3098ba2b2efdSGlen Barber
3099ba2b2efdSGlen Barber    A new file LICENSE makes it easier to see that the code and data
3100ba2b2efdSGlen Barber    are mostly public-domain.  (Thanks to James Knight.)  The three
3101ba2b2efdSGlen Barber    non-public-domain files now use the current (3-clause) BSD license
3102ba2b2efdSGlen Barber    instead of older versions of that license.
3103ba2b2efdSGlen Barber
3104ba2b2efdSGlen Barber    tz-link.htm mentions the BDE library (thanks to Andrew Paprocki),
3105ba2b2efdSGlen Barber    CCTZ (thanks to Tim Parenti), TimeJones.com, and has a new section
3106ba2b2efdSGlen Barber    on editing tz source files (with a mention of Sublime zoneinfo,
3107ba2b2efdSGlen Barber    thanks to Gilmore Davidson).
3108ba2b2efdSGlen Barber
3109ba2b2efdSGlen Barber    The Theory and asia files now mention the 2015 book "The Global
3110ba2b2efdSGlen Barber    Transformation of Time, 1870-1950", and cite a couple of reviews.
3111ba2b2efdSGlen Barber
3112ba2b2efdSGlen Barber    The America/Chicago entry now documents the informal use of US
3113ba2b2efdSGlen Barber    central time in Fort Pierre, South Dakota.  (Thanks to Rick
3114ba2b2efdSGlen Barber    McDermid, Matt Johnson, and Steve Jones.)
3115ba2b2efdSGlen Barber
3116ba2b2efdSGlen Barber
3117ba2b2efdSGlen BarberRelease 2015g - 2015-10-01 00:39:51 -0700
3118ba2b2efdSGlen Barber
3119ba2b2efdSGlen Barber  Changes affecting future timestamps
3120ba2b2efdSGlen Barber
3121ba2b2efdSGlen Barber    Turkey's 2015 fall-back transition is scheduled for Nov. 8, not Oct. 25.
3122ba2b2efdSGlen Barber    (Thanks to Fatih.)
3123ba2b2efdSGlen Barber
3124ba2b2efdSGlen Barber    Norfolk moves from +1130 to +1100 on 2015-10-04 at 02:00 local time.
3125ba2b2efdSGlen Barber    (Thanks to Alexander Krivenyshev.)
3126ba2b2efdSGlen Barber
3127ba2b2efdSGlen Barber    Fiji's 2016 fall-back transition is scheduled for January 17, not 24.
3128ba2b2efdSGlen Barber    (Thanks to Ken Rylander.)
3129ba2b2efdSGlen Barber
3130ba2b2efdSGlen Barber    Fort Nelson, British Columbia will not fall back on 2015-11-01.  It has
3131ba2b2efdSGlen Barber    effectively been on MST (-0700) since it advanced its clocks on 2015-03-08.
3132ba2b2efdSGlen Barber    New zone America/Fort_Nelson.  (Thanks to Matt Johnson.)
3133ba2b2efdSGlen Barber
3134ba2b2efdSGlen Barber  Changes affecting past timestamps
3135ba2b2efdSGlen Barber
3136ba2b2efdSGlen Barber    Norfolk observed DST from 1974-10-27 02:00 to 1975-03-02 02:00.
3137ba2b2efdSGlen Barber
3138ba2b2efdSGlen Barber  Changes affecting code
3139ba2b2efdSGlen Barber
3140ba2b2efdSGlen Barber    localtime no longer mishandles America/Anchorage after 2037.
3141ba2b2efdSGlen Barber    (Thanks to Bradley White for reporting the bug.)
3142ba2b2efdSGlen Barber
3143ba2b2efdSGlen Barber    On hosts with signed 32-bit time_t, localtime no longer mishandles
3144ba2b2efdSGlen Barber    Pacific/Fiji after 2038-01-16 14:00 UTC.
3145ba2b2efdSGlen Barber
3146ba2b2efdSGlen Barber    The localtime module allows the variables 'timezone', 'daylight',
3147ba2b2efdSGlen Barber    and 'altzone' to be in common storage shared with other modules,
3148ba2b2efdSGlen Barber    and declares them in case the system <time.h> does not.
3149ba2b2efdSGlen Barber    (Problems reported by Kees Dekker.)
3150ba2b2efdSGlen Barber
3151ba2b2efdSGlen Barber    On platforms with tm_zone, strftime.c now assumes it is not NULL.
3152ba2b2efdSGlen Barber    This simplifies the code and is consistent with zdump.c.
3153ba2b2efdSGlen Barber    (Problem reported by Christos Zoulas.)
3154ba2b2efdSGlen Barber
3155ba2b2efdSGlen Barber  Changes affecting documentation
3156ba2b2efdSGlen Barber
3157ba2b2efdSGlen Barber   The tzfile man page now documents that transition times denote the
3158ba2b2efdSGlen Barber   starts (not the ends) of the corresponding time periods.
3159ba2b2efdSGlen Barber   (Ambiguity reported by Bill Seymour.)
3160ba2b2efdSGlen Barber
3161ba2b2efdSGlen Barber
3162ba2b2efdSGlen BarberRelease 2015f - 2015-08-10 18:06:56 -0700
3163ba2b2efdSGlen Barber
3164ba2b2efdSGlen Barber  Changes affecting future timestamps
3165ba2b2efdSGlen Barber
3166ba2b2efdSGlen Barber    North Korea switches to +0830 on 2015-08-15.  (Thanks to Steffen Thorsen.)
3167ba2b2efdSGlen Barber    The abbreviation remains "KST".  (Thanks to Robert Elz.)
3168ba2b2efdSGlen Barber
3169ba2b2efdSGlen Barber    Uruguay no longer observes DST.  (Thanks to Steffen Thorsen
3170ba2b2efdSGlen Barber    and Pablo Camargo.)
3171ba2b2efdSGlen Barber
3172ba2b2efdSGlen Barber  Changes affecting past and future timestamps
3173ba2b2efdSGlen Barber
3174ba2b2efdSGlen Barber    Moldova starts and ends DST at 00:00 UTC, not at 01:00 UTC.
3175ba2b2efdSGlen Barber    (Thanks to Roman Tudos.)
3176ba2b2efdSGlen Barber
3177ba2b2efdSGlen Barber  Changes affecting data format and code
3178ba2b2efdSGlen Barber
3179ba2b2efdSGlen Barber    zic's '-y YEARISTYPE' option is no longer documented.  The TYPE
3180ba2b2efdSGlen Barber    field of a Rule line should now be '-'; the old values 'even',
3181ba2b2efdSGlen Barber    'odd', 'uspres', 'nonpres', 'nonuspres' were already undocumented.
3182ba2b2efdSGlen Barber    Although the implementation has not changed, these features do not
3183ba2b2efdSGlen Barber    work in the default installation, they are not used in the data,
3184ba2b2efdSGlen Barber    and they are now considered obsolescent.
3185ba2b2efdSGlen Barber
3186ba2b2efdSGlen Barber    zic now checks that two rules don't take effect at the same time.
3187ba2b2efdSGlen Barber    (Thanks to Jon Skeet and Arthur David Olson.)  Constraints on
3188ba2b2efdSGlen Barber    simultaneity are now documented.
3189ba2b2efdSGlen Barber
3190f2fcff28SPhilip Paeps    The two characters '%z' in a zone format now stand for the UT
3191f2fcff28SPhilip Paeps    offset, e.g., '-07' for seven hours behind UT and '+0530' for
3192ba2b2efdSGlen Barber    five hours and thirty minutes ahead.  This better supports time
3193ba2b2efdSGlen Barber    zone abbreviations conforming to POSIX.1-2001 and later.
3194ba2b2efdSGlen Barber
3195ba2b2efdSGlen Barber  Changes affecting installed data files
3196ba2b2efdSGlen Barber
3197ba2b2efdSGlen Barber    Comments for America/Halifax and America/Glace_Bay have been improved.
3198ba2b2efdSGlen Barber    (Thanks to Brian Inglis.)
3199ba2b2efdSGlen Barber
3200ba2b2efdSGlen Barber    Data entries have been simplified for Atlantic/Canary, Europe/Simferopol,
3201ba2b2efdSGlen Barber    Europe/Sofia, and Europe/Tallinn.  This yields slightly smaller
3202ba2b2efdSGlen Barber    installed data files for Europe/Simferopol and Europe/Tallinn.
3203ba2b2efdSGlen Barber    It does not affect timestamps.  (Thanks to Howard Hinnant.)
3204ba2b2efdSGlen Barber
3205ba2b2efdSGlen Barber  Changes affecting code
3206ba2b2efdSGlen Barber
3207ba2b2efdSGlen Barber    zdump and zic no longer warn about valid time zone abbreviations
3208ba2b2efdSGlen Barber    like '-05'.
3209ba2b2efdSGlen Barber
3210ba2b2efdSGlen Barber    Some Visual Studio 2013 warnings have been suppressed.
3211ba2b2efdSGlen Barber    (Thanks to Kees Dekker.)
3212ba2b2efdSGlen Barber
3213ba2b2efdSGlen Barber    'date' no longer sets the time of day and its -a, -d, -n and -t
3214ba2b2efdSGlen Barber    options have been removed.  Long obsolescent, the implementation
3215ba2b2efdSGlen Barber    of these features had porting problems.  Builders no longer need
3216ba2b2efdSGlen Barber    to configure HAVE_ADJTIME, HAVE_SETTIMEOFDAY, or HAVE_UTMPX_H.
3217ba2b2efdSGlen Barber    (Thanks to Kees Dekker for pointing out the problem.)
3218ba2b2efdSGlen Barber
3219ba2b2efdSGlen Barber  Changes affecting documentation
3220ba2b2efdSGlen Barber
3221ba2b2efdSGlen Barber    The Theory file mentions naming issues earlier, as these seem to be
3222ba2b2efdSGlen Barber    poorly publicized (thanks to Gilmore Davidson for reporting the problem).
3223ba2b2efdSGlen Barber
3224ba2b2efdSGlen Barber    tz-link.htm mentions Time Zone Database Parser (thanks to Howard Hinnant).
3225ba2b2efdSGlen Barber
3226ba2b2efdSGlen Barber    Mention that Herbert Samuel introduced the term "Summer Time".
3227ba2b2efdSGlen Barber
3228ba2b2efdSGlen Barber
3229ba2b2efdSGlen BarberRelease 2015e - 2015-06-13 10:56:02 -0700
3230ba2b2efdSGlen Barber
3231ba2b2efdSGlen Barber  Changes affecting future timestamps
3232ba2b2efdSGlen Barber
3233ba2b2efdSGlen Barber    Morocco will suspend DST from 2015-06-14 03:00 through 2015-07-19 02:00,
3234ba2b2efdSGlen Barber    not 06-13 and 07-18 as we had guessed.  (Thanks to Milamber.)
3235ba2b2efdSGlen Barber
3236ba2b2efdSGlen Barber    Assume Cayman Islands will observe DST starting next year, using US rules.
3237ba2b2efdSGlen Barber    Although it isn't guaranteed, it is the most likely.
3238ba2b2efdSGlen Barber
3239ba2b2efdSGlen Barber  Changes affecting data format
3240ba2b2efdSGlen Barber
3241ba2b2efdSGlen Barber    The file 'iso3166.tab' now uses UTF-8, so that its entries can better
3242ba2b2efdSGlen Barber    spell the names of Åland Islands, Côte d'Ivoire, and Réunion.
3243ba2b2efdSGlen Barber
3244ba2b2efdSGlen Barber  Changes affecting code
3245ba2b2efdSGlen Barber
3246ba2b2efdSGlen Barber    When displaying data, tzselect converts it to the current locale's
3247ba2b2efdSGlen Barber    encoding if the iconv command works.  (Problem reported by random832.)
3248ba2b2efdSGlen Barber
3249ba2b2efdSGlen Barber    tzselect no longer mishandles Dominica, fixing a bug introduced
3250ba2b2efdSGlen Barber    in Release 2014f.  (Problem reported by Owen Leibman.)
3251ba2b2efdSGlen Barber
3252ba2b2efdSGlen Barber    zic -l no longer fails when compiled with -DTZDEFAULT=\"/etc/localtime\".
3253ba2b2efdSGlen Barber    This fixes a bug introduced in Release 2014f.
3254ba2b2efdSGlen Barber    (Problem reported by Leonardo Chiquitto.)
3255ba2b2efdSGlen Barber
3256ba2b2efdSGlen Barber
3257ba2b2efdSGlen BarberRelease 2015d - 2015-04-24 08:09:46 -0700
3258ba2b2efdSGlen Barber
3259ba2b2efdSGlen Barber  Changes affecting future timestamps
3260ba2b2efdSGlen Barber
3261ba2b2efdSGlen Barber    Egypt will not observe DST in 2015 and will consider canceling it
3262ba2b2efdSGlen Barber    permanently.  For now, assume no DST indefinitely.
3263ba2b2efdSGlen Barber    (Thanks to Ahmed Nazmy and Tim Parenti.)
3264ba2b2efdSGlen Barber
3265ba2b2efdSGlen Barber  Changes affecting past timestamps
3266ba2b2efdSGlen Barber
3267ba2b2efdSGlen Barber    America/Whitehorse switched from UT -09 to -08 on 1967-05-28, not
3268ba2b2efdSGlen Barber    1966-07-01.  Also, Yukon's time zone history is documented better.
3269ba2b2efdSGlen Barber    (Thanks to Brian Inglis and Dennis Ferguson.)
3270ba2b2efdSGlen Barber
3271ba2b2efdSGlen Barber  Change affecting past and future time zone abbreviations
3272ba2b2efdSGlen Barber
3273ba2b2efdSGlen Barber    The abbreviations for Hawaii-Aleutian standard and daylight times
3274ba2b2efdSGlen Barber    have been changed from HAST/HADT to HST/HDT, as per US Government
3275ba2b2efdSGlen Barber    Printing Office style.  This affects only America/Adak since 1983,
3276ba2b2efdSGlen Barber    as America/Honolulu was already using the new style.
3277ba2b2efdSGlen Barber
3278ba2b2efdSGlen Barber  Changes affecting code
3279ba2b2efdSGlen Barber
3280ba2b2efdSGlen Barber   zic has some minor performance improvements.
3281ba2b2efdSGlen Barber
3282ba2b2efdSGlen Barber
3283ba2b2efdSGlen BarberRelease 2015c - 2015-04-11 08:55:55 -0700
3284ba2b2efdSGlen Barber
3285ba2b2efdSGlen Barber  Changes affecting future timestamps
3286ba2b2efdSGlen Barber
3287ba2b2efdSGlen Barber    Egypt's spring-forward transition is at 24:00 on April's last Thursday,
3288ba2b2efdSGlen Barber    not 00:00 on April's last Friday.  2015's transition will therefore be on
3289ba2b2efdSGlen Barber    Thursday, April 30 at 24:00, not Friday, April 24 at 00:00.  Similar fixes
3290ba2b2efdSGlen Barber    apply to 2026, 2037, 2043, etc.  (Thanks to Steffen Thorsen.)
3291ba2b2efdSGlen Barber
3292ba2b2efdSGlen Barber  Changes affecting past timestamps
3293ba2b2efdSGlen Barber
3294ba2b2efdSGlen Barber    The following changes affect some pre-1991 Chile-related timestamps
3295ba2b2efdSGlen Barber    in America/Santiago, Antarctica/Palmer, and Pacific/Easter.
3296ba2b2efdSGlen Barber
3297ba2b2efdSGlen Barber      The 1910 transition was January 10, not January 1.
3298ba2b2efdSGlen Barber
3299ba2b2efdSGlen Barber      The 1918 transition was September 10, not September 1.
3300ba2b2efdSGlen Barber
3301ba2b2efdSGlen Barber      The UT -04 time observed from 1932 to 1942 is now considered to
3302ba2b2efdSGlen Barber      be standard time, not year-round DST.
3303ba2b2efdSGlen Barber
3304ba2b2efdSGlen Barber      Santiago observed DST (UT -03) from 1946-07-15 through
3305ba2b2efdSGlen Barber      1946-08-31, then reverted to standard time, then switched to -05
3306ba2b2efdSGlen Barber      on 1947-04-01.
3307ba2b2efdSGlen Barber
3308ba2b2efdSGlen Barber      Assume transitions before 1968 were at 00:00, since we have no data
3309ba2b2efdSGlen Barber      saying otherwise.
3310ba2b2efdSGlen Barber
3311ba2b2efdSGlen Barber      The spring 1988 transition was 1988-10-09, not 1988-10-02.
3312ba2b2efdSGlen Barber      The fall 1990 transition was 1990-03-11, not 1990-03-18.
3313ba2b2efdSGlen Barber
3314f2fcff28SPhilip Paeps      Assume no UT offset change for Pacific/Easter on 1890-01-01,
3315ba2b2efdSGlen Barber      and omit all transitions on Pacific/Easter from 1942 through 1946
3316ba2b2efdSGlen Barber      since we have no data suggesting that they existed.
3317ba2b2efdSGlen Barber
3318ba2b2efdSGlen Barber    One more zone has been turned into a link, as it differed
3319ba2b2efdSGlen Barber    from an existing zone only for older timestamps.  As usual,
3320f2fcff28SPhilip Paeps    this change affects UT offsets in pre-1970 timestamps only.
3321ba2b2efdSGlen Barber    The zone's old contents have been moved to the 'backzone' file.
3322ba2b2efdSGlen Barber    The affected zone is America/Montreal.
3323ba2b2efdSGlen Barber
3324ba2b2efdSGlen Barber  Changes affecting commentary
3325ba2b2efdSGlen Barber
3326ba2b2efdSGlen Barber    Mention the TZUpdater tool.
3327ba2b2efdSGlen Barber
3328ba2b2efdSGlen Barber    Mention "The Time Now".  (Thanks to Brandon Ramsey.)
3329ba2b2efdSGlen Barber
3330ba2b2efdSGlen Barber
3331ba2b2efdSGlen BarberRelease 2015b - 2015-03-19 23:28:11 -0700
3332ba2b2efdSGlen Barber
3333ba2b2efdSGlen Barber  Changes affecting future timestamps
3334ba2b2efdSGlen Barber
3335ba2b2efdSGlen Barber    Mongolia will start observing DST again this year, from the last
3336ba2b2efdSGlen Barber    Saturday in March at 02:00 to the last Saturday in September at 00:00.
3337ba2b2efdSGlen Barber    (Thanks to Ganbold Tsagaankhuu.)
3338ba2b2efdSGlen Barber
3339ba2b2efdSGlen Barber    Palestine will start DST on March 28, not March 27.  Also,
3340ba2b2efdSGlen Barber    correct the fall 2014 transition from September 26 to October 24.
3341ba2b2efdSGlen Barber    Adjust future predictions accordingly.  (Thanks to Steffen Thorsen.)
3342ba2b2efdSGlen Barber
3343ba2b2efdSGlen Barber  Changes affecting past timestamps
3344ba2b2efdSGlen Barber
3345ba2b2efdSGlen Barber    The 1982 zone shift in Pacific/Easter has been corrected, fixing a 2015a
3346ba2b2efdSGlen Barber    regression.  (Thanks to Stuart Bishop for reporting the problem.)
3347ba2b2efdSGlen Barber
3348ba2b2efdSGlen Barber    Some more zones have been turned into links, when they differed
3349ba2b2efdSGlen Barber    from existing zones only for older timestamps.  As usual,
3350f2fcff28SPhilip Paeps    these changes affect UT offsets in pre-1970 timestamps only.
3351ba2b2efdSGlen Barber    Their old contents have been moved to the 'backzone' file.
3352ba2b2efdSGlen Barber    The affected zones are: America/Antigua, America/Cayman,
3353ba2b2efdSGlen Barber    Pacific/Midway, and Pacific/Saipan.
3354ba2b2efdSGlen Barber
3355ba2b2efdSGlen Barber  Changes affecting time zone abbreviations
3356ba2b2efdSGlen Barber
3357ba2b2efdSGlen Barber    Correct the 1992-2010 DST abbreviation in Volgograd from "MSK" to "MSD".
3358ba2b2efdSGlen Barber    (Thanks to Hank W.)
3359ba2b2efdSGlen Barber
3360ba2b2efdSGlen Barber  Changes affecting code
3361ba2b2efdSGlen Barber
3362ba2b2efdSGlen Barber    Fix integer overflow bug in reference 'mktime' implementation.
3363ba2b2efdSGlen Barber    (Problem reported by Jörg Richter.)
3364ba2b2efdSGlen Barber
3365ba2b2efdSGlen Barber    Allow -Dtime_tz=time_t compilations, and allow -Dtime_tz=... libraries
3366ba2b2efdSGlen Barber    to be used in the same executable as standard-library time_t functions.
3367ba2b2efdSGlen Barber    (Problems reported by Bradley White.)
3368ba2b2efdSGlen Barber
3369ba2b2efdSGlen Barber  Changes affecting commentary
3370ba2b2efdSGlen Barber
3371ba2b2efdSGlen Barber    Cite the recent Mexican decree changing Quintana Roo's time zone.
3372ba2b2efdSGlen Barber    (Thanks to Carlos Raúl Perasso.)
3373ba2b2efdSGlen Barber
3374ba2b2efdSGlen Barber    Likewise for the recent Chilean decree.  (Thanks to Eduardo Romero Urra.)
3375ba2b2efdSGlen Barber
3376ba2b2efdSGlen Barber    Update info about Mars time.
3377ba2b2efdSGlen Barber
3378ba2b2efdSGlen Barber
3379ba2b2efdSGlen BarberRelease 2015a - 2015-01-29 22:35:20 -0800
3380ba2b2efdSGlen Barber
3381ba2b2efdSGlen Barber  Changes affecting future timestamps
3382ba2b2efdSGlen Barber
3383ba2b2efdSGlen Barber    The Mexican state of Quintana Roo, represented by America/Cancun,
3384ba2b2efdSGlen Barber    will shift from Central Time with DST to Eastern Time without DST
3385ba2b2efdSGlen Barber    on 2015-02-01 at 02:00.  (Thanks to Steffen Thorsen and Gwillim Law.)
3386ba2b2efdSGlen Barber
3387ba2b2efdSGlen Barber    Chile will not change clocks in April or thereafter; its new standard time
3388ba2b2efdSGlen Barber    will be its old daylight saving time.  This affects America/Santiago,
3389ba2b2efdSGlen Barber    Pacific/Easter, and Antarctica/Palmer.  (Thanks to Juan Correa.)
3390ba2b2efdSGlen Barber
3391ba2b2efdSGlen Barber    New leap second 2015-06-30 23:59:60 UTC as per IERS Bulletin C 49.
3392ba2b2efdSGlen Barber    (Thanks to Tim Parenti.)
3393ba2b2efdSGlen Barber
3394ba2b2efdSGlen Barber  Changes affecting past timestamps
3395ba2b2efdSGlen Barber
3396ba2b2efdSGlen Barber    Iceland observed DST in 1919 and 1921, and its 1939 fallback
3397ba2b2efdSGlen Barber    transition was Oct. 29, not Nov. 29.  Remove incorrect data from
3398ba2b2efdSGlen Barber    Shanks about time in Iceland between 1837 and 1908.
3399ba2b2efdSGlen Barber
3400ba2b2efdSGlen Barber    Some more zones have been turned into links, when they differed
3401ba2b2efdSGlen Barber    from existing zones only for older timestamps.  As usual,
3402f2fcff28SPhilip Paeps    these changes affect UT offsets in pre-1970 timestamps only.
3403ba2b2efdSGlen Barber    Their old contents have been moved to the 'backzone' file.
3404ba2b2efdSGlen Barber    The affected zones are: Asia/Aden, Asia/Bahrain, Asia/Kuwait,
3405ba2b2efdSGlen Barber    and Asia/Muscat.
3406ba2b2efdSGlen Barber
3407ba2b2efdSGlen Barber  Changes affecting code
3408ba2b2efdSGlen Barber
3409ba2b2efdSGlen Barber    tzalloc now scrubs time zone abbreviations compatibly with the way
3410ba2b2efdSGlen Barber    that tzset always has, by replacing invalid bytes with '_' and by
3411ba2b2efdSGlen Barber    shortening too-long abbreviations.
3412ba2b2efdSGlen Barber
3413ba2b2efdSGlen Barber    tzselect ports to POSIX awk implementations, no longer mishandles
3414ba2b2efdSGlen Barber    POSIX TZ settings when GNU awk is used, and reports POSIX TZ
3415ba2b2efdSGlen Barber    settings to the user.  (Thanks to Stefan Kuhn.)
3416ba2b2efdSGlen Barber
3417ba2b2efdSGlen Barber  Changes affecting build procedure
3418ba2b2efdSGlen Barber
3419ba2b2efdSGlen Barber    'make check' now checks for links to links in the data.
3420ba2b2efdSGlen Barber    One such link (for Africa/Asmera) has been fixed.
3421ba2b2efdSGlen Barber    (Thanks to Stephen Colebourne for pointing out the problem.)
3422ba2b2efdSGlen Barber
3423ba2b2efdSGlen Barber  Changes affecting commentary
3424ba2b2efdSGlen Barber
3425ba2b2efdSGlen Barber    The leapseconds file commentary now mentions the expiration date.
3426ba2b2efdSGlen Barber    (Problem reported by Martin Burnicki.)
3427ba2b2efdSGlen Barber
3428ba2b2efdSGlen Barber    Update Mexican Library of Congress URL.
3429ba2b2efdSGlen Barber
3430ba2b2efdSGlen Barber
3431ba2b2efdSGlen BarberRelease 2014j - 2014-11-10 17:37:11 -0800
3432ba2b2efdSGlen Barber
3433ba2b2efdSGlen Barber  Changes affecting current and future timestamps
3434ba2b2efdSGlen Barber
3435ba2b2efdSGlen Barber    Turks & Caicos' switch from US eastern time to UT -04 year-round
3436ba2b2efdSGlen Barber    did not occur on 2014-11-02 at 02:00.  It's currently scheduled
3437ba2b2efdSGlen Barber    for 2015-11-01 at 02:00.  (Thanks to Chris Walton.)
3438ba2b2efdSGlen Barber
3439ba2b2efdSGlen Barber  Changes affecting past timestamps
3440ba2b2efdSGlen Barber
3441ba2b2efdSGlen Barber    Many pre-1989 timestamps have been corrected for Asia/Seoul and
3442ba2b2efdSGlen Barber    Asia/Pyongyang, based on sources for the Korean-language Wikipedia
3443ba2b2efdSGlen Barber    entry for time in Korea.  (Thanks to Sanghyuk Jung.)  Also, no
3444ba2b2efdSGlen Barber    longer guess that Pyongyang mimicked Seoul time after World War II,
3445ba2b2efdSGlen Barber    as this is politically implausible.
3446ba2b2efdSGlen Barber
3447ba2b2efdSGlen Barber    Some more zones have been turned into links, when they differed
3448ba2b2efdSGlen Barber    from existing zones only for older timestamps.  As usual,
3449f2fcff28SPhilip Paeps    these changes affect UT offsets in pre-1970 timestamps only.
3450ba2b2efdSGlen Barber    Their old contents have been moved to the 'backzone' file.
3451ba2b2efdSGlen Barber    The affected zones are: Africa/Addis_Ababa, Africa/Asmara,
3452ba2b2efdSGlen Barber    Africa/Dar_es_Salaam, Africa/Djibouti, Africa/Kampala,
3453ba2b2efdSGlen Barber    Africa/Mogadishu, Indian/Antananarivo, Indian/Comoro, and
3454ba2b2efdSGlen Barber    Indian/Mayotte.
3455ba2b2efdSGlen Barber
3456ba2b2efdSGlen Barber  Changes affecting commentary
3457ba2b2efdSGlen Barber
3458ba2b2efdSGlen Barber    The commentary is less enthusiastic about Shanks as a source,
3459ba2b2efdSGlen Barber    and is more careful to distinguish UT from UTC.
3460ba2b2efdSGlen Barber
3461ba2b2efdSGlen Barber
3462ba2b2efdSGlen BarberRelease 2014i - 2014-10-21 22:04:57 -0700
3463ba2b2efdSGlen Barber
3464ba2b2efdSGlen Barber  Changes affecting future timestamps
3465ba2b2efdSGlen Barber
3466ba2b2efdSGlen Barber    Pacific/Fiji will observe DST from 2014-11-02 02:00 to 2015-01-18 03:00.
3467ba2b2efdSGlen Barber    (Thanks to Ken Rylander for the heads-up.)  Guess that future
3468ba2b2efdSGlen Barber    years will use a similar pattern.
3469ba2b2efdSGlen Barber
3470ba2b2efdSGlen Barber    A new Zone Pacific/Bougainville, for the part of Papua New Guinea
3471ba2b2efdSGlen Barber    that plans to switch from UT +10 to +11 on 2014-12-28 at 02:00.
3472ba2b2efdSGlen Barber    (Thanks to Kiley Walbom for the heads-up.)
3473ba2b2efdSGlen Barber
3474ba2b2efdSGlen Barber  Changes affecting time zone abbreviations
3475ba2b2efdSGlen Barber
3476ba2b2efdSGlen Barber    Since Belarus is not changing its clocks even though Moscow is,
3477ba2b2efdSGlen Barber    the time zone abbreviation in Europe/Minsk is changing from FET
3478259e2ad7SPhilip Paeps    to its more traditional value MSK on 2014-10-26 at 01:00.
3479ba2b2efdSGlen Barber    (Thanks to Alexander Bokovoy for the heads-up about Belarus.)
3480ba2b2efdSGlen Barber
3481ba2b2efdSGlen Barber    The new abbreviation IDT stands for the pre-1976 use of UT +08 in
3482ba2b2efdSGlen Barber    Indochina, to distinguish it better from ICT (+07).
3483ba2b2efdSGlen Barber
3484ba2b2efdSGlen Barber  Changes affecting past timestamps
3485ba2b2efdSGlen Barber
3486ba2b2efdSGlen Barber    Many timestamps have been corrected for Asia/Ho_Chi_Minh before 1976
3487ba2b2efdSGlen Barber    (thanks to Trần Ngọc Quân for an indirect pointer to Trần Tiến Bình's
3488ba2b2efdSGlen Barber    authoritative book).  Asia/Ho_Chi_Minh has been added to
3489ba2b2efdSGlen Barber    zone1970.tab, to give tzselect users in Vietnam two choices,
3490ba2b2efdSGlen Barber    since north and south Vietnam disagreed after our 1970 cutoff.
3491ba2b2efdSGlen Barber
3492ba2b2efdSGlen Barber    Asia/Phnom_Penh and Asia/Vientiane have been turned into links, as
3493ba2b2efdSGlen Barber    they differed from existing zones only for older timestamps.  As
3494ba2b2efdSGlen Barber    usual, these changes affect pre-1970 timestamps only.  Their old
3495ba2b2efdSGlen Barber    contents have been moved to the 'backzone' file.
3496ba2b2efdSGlen Barber
3497ba2b2efdSGlen Barber  Changes affecting code
3498ba2b2efdSGlen Barber
3499ba2b2efdSGlen Barber    The time-related library functions now set errno on failure, and
3500ba2b2efdSGlen Barber    some crashes in the new tzalloc-related library functions have
3501ba2b2efdSGlen Barber    been fixed.  (Thanks to Christos Zoulas for reporting most of
3502ba2b2efdSGlen Barber    these problems and for suggesting fixes.)
3503ba2b2efdSGlen Barber
3504ba2b2efdSGlen Barber    If USG_COMPAT is defined and the requested timestamp is standard time,
3505ba2b2efdSGlen Barber    the tz library's localtime and mktime functions now set the extern
3506ba2b2efdSGlen Barber    variable timezone to a value appropriate for that timestamp; and
3507ba2b2efdSGlen Barber    similarly for ALTZONE, daylight saving time, and the altzone variable.
3508ba2b2efdSGlen Barber    This change is a companion to the tzname change in 2014h, and is
3509ba2b2efdSGlen Barber    designed to make timezone and altzone more compatible with tzname.
3510ba2b2efdSGlen Barber
3511ba2b2efdSGlen Barber    The tz library's functions now set errno to EOVERFLOW if they fail
3512ba2b2efdSGlen Barber    because the result cannot be represented.  ctime and ctime_r now
3513ba2b2efdSGlen Barber    return NULL and set errno when a timestamp is out of range, rather
3514ba2b2efdSGlen Barber    than having undefined behavior.
3515ba2b2efdSGlen Barber
3516ba2b2efdSGlen Barber    Some bugs associated with the new 2014g functions have been fixed.
3517ba2b2efdSGlen Barber    This includes a bug that largely incapacitated the new functions
3518ba2b2efdSGlen Barber    time2posix_z and posix2time_z.  (Thanks to Christos Zoulas.)
3519ba2b2efdSGlen Barber    It also includes some uses of uninitialized variables after tzalloc.
3520ba2b2efdSGlen Barber    The new code uses the standard type 'ssize_t', which the Makefile
3521ba2b2efdSGlen Barber    now gives porting advice about.
3522ba2b2efdSGlen Barber
3523ba2b2efdSGlen Barber  Changes affecting commentary
3524ba2b2efdSGlen Barber
3525ba2b2efdSGlen Barber    Updated URLs for NRC Canada (thanks to Matt Johnson and Brian Inglis).
3526ba2b2efdSGlen Barber
3527ba2b2efdSGlen Barber
3528ba2b2efdSGlen BarberRelease 2014h - 2014-09-25 18:59:03 -0700
3529ba2b2efdSGlen Barber
3530ba2b2efdSGlen Barber  Changes affecting past timestamps
3531ba2b2efdSGlen Barber
3532ba2b2efdSGlen Barber    America/Jamaica's 1974 spring-forward transition was Jan. 6, not Apr. 28.
3533ba2b2efdSGlen Barber
3534ba2b2efdSGlen Barber    Shanks says Asia/Novokuznetsk switched from LMT (not "NMT") on 1924-05-01,
3535ba2b2efdSGlen Barber    not 1920-01-06.  The old entry was based on a misinterpretation of Shanks.
3536ba2b2efdSGlen Barber
3537ba2b2efdSGlen Barber    Some more zones have been turned into links, when they differed
3538ba2b2efdSGlen Barber    from existing zones only for older timestamps.  As usual,
3539f2fcff28SPhilip Paeps    these changes affect UT offsets in pre-1970 timestamps only.
3540ba2b2efdSGlen Barber    Their old contents have been moved to the 'backzone' file.
3541ba2b2efdSGlen Barber    The affected zones are: Africa/Blantyre, Africa/Bujumbura,
3542ba2b2efdSGlen Barber    Africa/Gaborone, Africa/Harare, Africa/Kigali, Africa/Lubumbashi,
3543ba2b2efdSGlen Barber    Africa/Lusaka, Africa/Maseru, and Africa/Mbabane.
3544ba2b2efdSGlen Barber
3545ba2b2efdSGlen Barber  Changes affecting code
3546ba2b2efdSGlen Barber
3547ba2b2efdSGlen Barber    zdump -V and -v now output gmtoff= values on all platforms,
3548ba2b2efdSGlen Barber    not merely on platforms defining TM_GMTOFF.
3549ba2b2efdSGlen Barber
3550ba2b2efdSGlen Barber    The tz library's localtime and mktime functions now set tzname to a value
3551ba2b2efdSGlen Barber    appropriate for the requested timestamp, and zdump now uses this
3552ba2b2efdSGlen Barber    on platforms not defining TM_ZONE, fixing a 2014g regression.
3553ba2b2efdSGlen Barber    (Thanks to Tim Parenti for reporting the problem.)
3554ba2b2efdSGlen Barber
3555ba2b2efdSGlen Barber    The tz library no longer sets tzname if localtime or mktime fails.
3556ba2b2efdSGlen Barber
3557ba2b2efdSGlen Barber    zdump -c no longer mishandles transitions near year boundaries.
3558ba2b2efdSGlen Barber    (Thanks to Tim Parenti for reporting the problem.)
3559ba2b2efdSGlen Barber
3560ba2b2efdSGlen Barber    An access to uninitialized data has been fixed.
3561ba2b2efdSGlen Barber    (Thanks to Jörg Richter for reporting the problem.)
3562ba2b2efdSGlen Barber
3563ba2b2efdSGlen Barber    When THREAD_SAFE is defined, the code ports to the C11 memory model.
3564ba2b2efdSGlen Barber    A memory leak has been fixed if ALL_STATE and THREAD_SAFE are defined
3565ba2b2efdSGlen Barber    and two threads race to initialize data used by gmtime-like functions.
3566ba2b2efdSGlen Barber    (Thanks to Andy Heninger for reporting the problems.)
3567ba2b2efdSGlen Barber
3568ba2b2efdSGlen Barber  Changes affecting build procedure
3569ba2b2efdSGlen Barber
3570259e2ad7SPhilip Paeps    'make check' now checks better for properly sorted data.
3571ba2b2efdSGlen Barber
3572ba2b2efdSGlen Barber  Changes affecting documentation and commentary
3573ba2b2efdSGlen Barber
3574ba2b2efdSGlen Barber    zdump's gmtoff=N output is now documented, and its isdst=D output
3575ba2b2efdSGlen Barber    is now documented to possibly output D values other than 0 or 1.
3576ba2b2efdSGlen Barber
3577ba2b2efdSGlen Barber    zdump -c's treatment of years is now documented to use the
3578ba2b2efdSGlen Barber    Gregorian calendar and Universal Time without leap seconds,
3579ba2b2efdSGlen Barber    and its behavior at cutoff boundaries is now documented better.
3580ba2b2efdSGlen Barber    (Thanks to Arthur David Olson and Tim Parenti for reporting the problems.)
3581ba2b2efdSGlen Barber
3582ba2b2efdSGlen Barber    Programs are now documented to use the proleptic Gregorian calendar.
3583ba2b2efdSGlen Barber    (Thanks to Alan Barrett for the suggestion.)
3584ba2b2efdSGlen Barber
3585ba2b2efdSGlen Barber    Fractional-second GMT offsets have been documented for civil time
3586ba2b2efdSGlen Barber    in 19th-century Chennai, Jakarta, and New York.
3587ba2b2efdSGlen Barber
3588ba2b2efdSGlen Barber
3589ba2b2efdSGlen BarberRelease 2014g - 2014-08-28 12:31:23 -0700
3590ba2b2efdSGlen Barber
3591ba2b2efdSGlen Barber  Changes affecting future timestamps
3592ba2b2efdSGlen Barber
3593ba2b2efdSGlen Barber    Turks & Caicos is switching from US eastern time to UT -04
3594ba2b2efdSGlen Barber    year-round, modeled as a switch on 2014-11-02 at 02:00.
3595ba2b2efdSGlen Barber    [As noted in 2014j, this switch was later delayed.]
3596ba2b2efdSGlen Barber
3597ba2b2efdSGlen Barber  Changes affecting past timestamps
3598ba2b2efdSGlen Barber
3599ba2b2efdSGlen Barber    Time in Russia or the USSR before 1926 or so has been corrected by
3600ba2b2efdSGlen Barber    a few seconds in the following zones: Asia/Irkutsk,
3601ba2b2efdSGlen Barber    Asia/Krasnoyarsk, Asia/Omsk, Asia/Samarkand, Asia/Tbilisi,
3602ba2b2efdSGlen Barber    Asia/Vladivostok, Asia/Yakutsk, Europe/Riga, Europe/Samara.  For
3603ba2b2efdSGlen Barber    Asia/Yekaterinburg the correction is a few minutes.  (Thanks to
3604ba2b2efdSGlen Barber    Vladimir Karpinsky.)
3605ba2b2efdSGlen Barber
3606ba2b2efdSGlen Barber    The Portuguese decree of 1911-05-26 took effect on 1912-01-01.
3607ba2b2efdSGlen Barber    This affects 1911 timestamps in Africa/Bissau, Africa/Luanda,
3608ba2b2efdSGlen Barber    Atlantic/Azores, and Atlantic/Madeira.  Also, Lisbon's pre-1912
3609ba2b2efdSGlen Barber    GMT offset was -0:36:45 (rounded from -0:36:44.68), not -0:36:32.
3610ba2b2efdSGlen Barber    (Thanks to Stephen Colebourne for pointing to the decree.)
3611ba2b2efdSGlen Barber
3612ba2b2efdSGlen Barber    Asia/Dhaka ended DST on 2009-12-31 at 24:00, not 23:59.
3613ba2b2efdSGlen Barber
3614ba2b2efdSGlen Barber    A new file 'backzone' contains data which may appeal to
3615ba2b2efdSGlen Barber    connoisseurs of old timestamps, although it is out of scope for
3616ba2b2efdSGlen Barber    the tz database, is often poorly sourced, and contains some data
3617ba2b2efdSGlen Barber    that is known to be incorrect.  The new file is not recommended
3618ba2b2efdSGlen Barber    for ordinary use and its entries are not installed by default.
3619ba2b2efdSGlen Barber    (Thanks to Lester Caine for the high-quality Jersey, Guernsey, and
3620ba2b2efdSGlen Barber    Isle of Man entries.)
3621ba2b2efdSGlen Barber
3622ba2b2efdSGlen Barber    Some more zones have been turned into links, when they differed
3623ba2b2efdSGlen Barber    from existing zones only for older timestamps.  As usual,
3624f2fcff28SPhilip Paeps    these changes affect UT offsets in pre-1970 timestamps only.
3625ba2b2efdSGlen Barber    Their old contents have been moved to the 'backzone' file.
3626ba2b2efdSGlen Barber    The affected zones are: Africa/Bangui, Africa/Brazzaville,
3627ba2b2efdSGlen Barber    Africa/Douala, Africa/Kinshasa, Africa/Libreville, Africa/Luanda,
3628ba2b2efdSGlen Barber    Africa/Malabo, Africa/Niamey, and Africa/Porto-Novo.
3629ba2b2efdSGlen Barber
3630ba2b2efdSGlen Barber  Changes affecting code
3631ba2b2efdSGlen Barber
3632ba2b2efdSGlen Barber    Unless NETBSD_INSPIRED is defined to 0, the tz library now
3633ba2b2efdSGlen Barber    supplies functions for creating and using objects that represent
3634ba2b2efdSGlen Barber    timezones. The new functions are tzalloc, tzfree, localtime_rz,
3635ba2b2efdSGlen Barber    mktime_z, and (if STD_INSPIRED is also defined) posix2time_z and
3636ba2b2efdSGlen Barber    time2posix_z.  They are intended for performance: for example,
3637ba2b2efdSGlen Barber    localtime_rz (unlike localtime_r) is trivially thread-safe without
3638ba2b2efdSGlen Barber    locking.  (Thanks to Christos Zoulas for proposing NetBSD-inspired
3639ba2b2efdSGlen Barber    functions, and to Alan Barrett and Jonathan Lennox for helping to
3640ba2b2efdSGlen Barber    debug the change.)
3641ba2b2efdSGlen Barber
3642ba2b2efdSGlen Barber    zdump now builds with the tz library unless USE_LTZ is defined to 0,
3643ba2b2efdSGlen Barber    This lets zdump use tz features even if the system library lacks them.
3644ba2b2efdSGlen Barber    To build zdump with the system library, use 'make CFLAGS=-DUSE_LTZ=0
3645ba2b2efdSGlen Barber    TZDOBJS=zdump.o CHECK_TIME_T_ALTERNATIVES='.
3646ba2b2efdSGlen Barber
3647ba2b2efdSGlen Barber    zdump now uses localtime_rz if available, as it's significantly faster,
3648ba2b2efdSGlen Barber    and it can help zdump better diagnose invalid timezone names.
3649ba2b2efdSGlen Barber    Define HAVE_LOCALTIME_RZ to 0 to suppress this.  HAVE_LOCALTIME_RZ
3650ba2b2efdSGlen Barber    defaults to 1 if NETBSD_INSPIRED && USE_LTZ.  When localtime_rz is
3651ba2b2efdSGlen Barber    not available, zdump now uses localtime_r and tzset if available,
3652ba2b2efdSGlen Barber    as this is a bit cleaner and faster than plain localtime.  Compile
3653ba2b2efdSGlen Barber    with -DHAVE_LOCALTIME_R=0 and/or -DHAVE_TZSET=0 if your system
3654ba2b2efdSGlen Barber    lacks these two functions.
3655ba2b2efdSGlen Barber
3656ba2b2efdSGlen Barber    If THREAD_SAFE is defined to 1, the tz library is now thread-safe.
3657ba2b2efdSGlen Barber    Although not needed for tz's own applications, which are single-threaded,
3658ba2b2efdSGlen Barber    this supports POSIX better if the tz library is used in multithreaded apps.
3659ba2b2efdSGlen Barber
3660ba2b2efdSGlen Barber    Some crashes have been fixed when zdump or the tz library is given
3661ba2b2efdSGlen Barber    invalid or outlandish input.
3662ba2b2efdSGlen Barber
3663ba2b2efdSGlen Barber    The tz library no longer mishandles leap seconds on platforms with
3664ba2b2efdSGlen Barber    unsigned time_t in timezones that lack ordinary transitions after 1970.
3665ba2b2efdSGlen Barber
3666ba2b2efdSGlen Barber    The tz code now attempts to infer TM_GMTOFF and TM_ZONE if not
3667ba2b2efdSGlen Barber    already defined, to make it easier to configure on common platforms.
3668ba2b2efdSGlen Barber    Define NO_TM_GMTOFF and NO_TM_ZONE to suppress this.
3669ba2b2efdSGlen Barber
3670ba2b2efdSGlen Barber    Unless the new macro UNINIT_TRAP is defined to 1, the tz code now
3671ba2b2efdSGlen Barber    assumes that reading uninitialized memory yields garbage values
3672ba2b2efdSGlen Barber    but does not cause other problems such as traps.
3673ba2b2efdSGlen Barber
3674ba2b2efdSGlen Barber    If TM_GMTOFF is defined and UNINIT_TRAP is 0, mktime is now
3675ba2b2efdSGlen Barber    more likely to guess right for ambiguous timestamps near
3676ba2b2efdSGlen Barber    transitions where tm_isdst does not change.
3677ba2b2efdSGlen Barber
3678ba2b2efdSGlen Barber    If HAVE_STRFTIME_L is defined to 1, the tz library now defines
3679ba2b2efdSGlen Barber    strftime_l for compatibility with recent versions of POSIX.
3680ba2b2efdSGlen Barber    Only the C locale is supported, though.  HAVE_STRFTIME_L defaults
3681ba2b2efdSGlen Barber    to 1 on recent POSIX versions, and to 0 otherwise.
3682ba2b2efdSGlen Barber
3683ba2b2efdSGlen Barber    tzselect -c now uses a hybrid distance measure that works better
3684ba2b2efdSGlen Barber    in Africa.  (Thanks to Alan Barrett for noting the problem.)
3685ba2b2efdSGlen Barber
3686ba2b2efdSGlen Barber    The C source code now ports to NetBSD when GCC_DEBUG_FLAGS is used,
3687ba2b2efdSGlen Barber    or when time_tz is defined.
3688ba2b2efdSGlen Barber
3689ba2b2efdSGlen Barber    When HAVE_UTMPX_H is set the 'date' command now builds on systems
3690ba2b2efdSGlen Barber    whose <utmpx.h> file does not define WTMPX_FILE, and when setting
3691ba2b2efdSGlen Barber    the date it updates the wtmpx file if _PATH_WTMPX is defined.
3692ba2b2efdSGlen Barber    This affects GNU/Linux and similar systems.
3693ba2b2efdSGlen Barber
3694ba2b2efdSGlen Barber    For easier maintenance later, some C code has been simplified,
3695ba2b2efdSGlen Barber    some lint has been removed, and the code has been tweaked so that
3696ba2b2efdSGlen Barber    plain 'make' is more likely to work.
3697ba2b2efdSGlen Barber
3698ba2b2efdSGlen Barber    The C type 'bool' is now used for boolean values, instead of 'int'.
3699ba2b2efdSGlen Barber
3700ba2b2efdSGlen Barber    The long-obsolete LOCALE_HOME code has been removed.
3701ba2b2efdSGlen Barber
3702ba2b2efdSGlen Barber    The long-obsolete 'gtime' function has been removed.
3703ba2b2efdSGlen Barber
3704ba2b2efdSGlen Barber  Changes affecting build procedure
3705ba2b2efdSGlen Barber
3706ba2b2efdSGlen Barber    'zdump' no longer links in ialloc.o, as it's not needed.
3707ba2b2efdSGlen Barber
3708ba2b2efdSGlen Barber    'make check_time_t_alternatives' no longer assumes GNU diff.
3709ba2b2efdSGlen Barber
3710ba2b2efdSGlen Barber  Changes affecting distribution tarballs
3711ba2b2efdSGlen Barber
3712ba2b2efdSGlen Barber    The files checktab.awk and zoneinfo2tdf.pl are now distributed in
3713ba2b2efdSGlen Barber    the tzdata tarball instead of the tzcode tarball, since they help
3714ba2b2efdSGlen Barber    maintain the data.  The NEWS and Theory files are now also
3715ba2b2efdSGlen Barber    distributed in the tzdata tarball, as they're relevant for data.
3716ba2b2efdSGlen Barber    (Thanks to Alan Barrett for pointing this out.)  Also, the
3717ba2b2efdSGlen Barber    leapseconds.awk file is no longer distributed in the tzcode
3718ba2b2efdSGlen Barber    tarball, since it belongs in the tzdata tarball (where 2014f
3719ba2b2efdSGlen Barber    inadvertently also distributed it).
3720ba2b2efdSGlen Barber
3721ba2b2efdSGlen Barber  Changes affecting documentation and commentary
3722ba2b2efdSGlen Barber
3723ba2b2efdSGlen Barber    A new file CONTRIBUTING is distributed.  (Thanks to Tim Parenti for
3724ba2b2efdSGlen Barber    suggesting a CONTRIBUTING file, and to Tony Finch and Walter Harms
3725ba2b2efdSGlen Barber    for debugging it.)
3726ba2b2efdSGlen Barber
3727ba2b2efdSGlen Barber    The man pages have been updated to use function prototypes,
3728ba2b2efdSGlen Barber    to document thread-safe variants like localtime_r, and to document
3729ba2b2efdSGlen Barber    the NetBSD-inspired functions tzalloc, tzfree, localtime_rz, and
3730ba2b2efdSGlen Barber    mktime_z.
3731ba2b2efdSGlen Barber
3732ba2b2efdSGlen Barber    The fields in Link lines have been renamed to be more descriptive
3733ba2b2efdSGlen Barber    and more like the parameters of 'ln'.  LINK-FROM has become TARGET,
3734ba2b2efdSGlen Barber    and LINK-TO has become LINK-NAME.
3735ba2b2efdSGlen Barber
3736ba2b2efdSGlen Barber    tz-link.htm mentions the IETF's tzdist working group; Windows
3737ba2b2efdSGlen Barber    Runtime etc. (thanks to Matt Johnson); and HP-UX's tztab.
3738ba2b2efdSGlen Barber
3739ba2b2efdSGlen Barber    Some broken URLs have been fixed in the commentary.  (Thanks to
3740ba2b2efdSGlen Barber    Lester Caine.)
3741ba2b2efdSGlen Barber
3742ba2b2efdSGlen Barber    Commentary about Philippines DST has been updated, and commentary
3743ba2b2efdSGlen Barber    on pre-1970 time in India has been added.
3744ba2b2efdSGlen Barber
3745ba2b2efdSGlen Barber
3746ba2b2efdSGlen BarberRelease 2014f - 2014-08-05 17:42:36 -0700
3747ba2b2efdSGlen Barber
3748ba2b2efdSGlen Barber  Changes affecting future timestamps
3749ba2b2efdSGlen Barber
3750ba2b2efdSGlen Barber    Russia will subtract an hour from most of its time zones on 2014-10-26
3751ba2b2efdSGlen Barber    at 02:00 local time.  (Thanks to Alexander Krivenyshev.)
3752ba2b2efdSGlen Barber    There are a few exceptions: Magadan Oblast (Asia/Magadan) and Zabaykalsky
3753ba2b2efdSGlen Barber    Krai are subtracting two hours; conversely, Chukotka Autonomous Okrug
3754ba2b2efdSGlen Barber    (Asia/Anadyr), Kamchatka Krai (Asia/Kamchatka), Kemerovo Oblast
3755ba2b2efdSGlen Barber    (Asia/Novokuznetsk), and the Samara Oblast and the Udmurt Republic
3756ba2b2efdSGlen Barber    (Europe/Samara) are not changing their clocks.  The changed zones are
3757ba2b2efdSGlen Barber    Europe/Kaliningrad, Europe/Moscow, Europe/Simferopol, Europe/Volgograd,
3758ba2b2efdSGlen Barber    Asia/Yekaterinburg, Asia/Omsk, Asia/Novosibirsk, Asia/Krasnoyarsk,
3759ba2b2efdSGlen Barber    Asia/Irkutsk, Asia/Yakutsk, Asia/Vladivostok, Asia/Khandyga,
3760ba2b2efdSGlen Barber    Asia/Sakhalin, and Asia/Ust-Nera; Asia/Magadan will have two hours
3761ba2b2efdSGlen Barber    subtracted; and Asia/Novokuznetsk's time zone abbreviation is affected,
3762ba2b2efdSGlen Barber    but not its UTC offset.  Two zones are added: Asia/Chita (split
3763ba2b2efdSGlen Barber    from Asia/Yakutsk, and also with two hours subtracted) and
3764ba2b2efdSGlen Barber    Asia/Srednekolymsk (split from Asia/Magadan, but with only one hour
3765ba2b2efdSGlen Barber    subtracted).  (Thanks to Tim Parenti for much of the above.)
3766ba2b2efdSGlen Barber
3767ba2b2efdSGlen Barber  Changes affecting time zone abbreviations
3768ba2b2efdSGlen Barber
3769ba2b2efdSGlen Barber    Australian eastern time zone abbreviations are now AEST/AEDT not EST,
3770ba2b2efdSGlen Barber    and similarly for the other Australian zones.  That is, for eastern
3771ba2b2efdSGlen Barber    standard and daylight saving time the abbreviations are AEST and AEDT
3772ba2b2efdSGlen Barber    instead of the former EST for both; similarly, ACST/ACDT, ACWST/ACWDT,
3773ba2b2efdSGlen Barber    and AWST/AWDT are now used instead of the former CST, CWST, and WST.
3774f2fcff28SPhilip Paeps    This change does not affect UT offsets, only time zone abbreviations.
3775ba2b2efdSGlen Barber    (Thanks to Rich Tibbett and many others.)
3776ba2b2efdSGlen Barber
3777ba2b2efdSGlen Barber    Asia/Novokuznetsk shifts from NOVT to KRAT (remaining on UT +07)
3778ba2b2efdSGlen Barber    effective 2014-10-26 at 02:00 local time.
3779ba2b2efdSGlen Barber
3780ba2b2efdSGlen Barber    The time zone abbreviation for Xinjiang Time (observed in Ürümqi)
3781ba2b2efdSGlen Barber    has been changed from URUT to XJT.  (Thanks to Luther Ma.)
3782ba2b2efdSGlen Barber
3783ba2b2efdSGlen Barber    Prefer MSK/MSD for Moscow time in Russia, even in other cities.
3784ba2b2efdSGlen Barber    Similarly, prefer EET/EEST for eastern European time in Russia.
3785ba2b2efdSGlen Barber
3786ba2b2efdSGlen Barber    Change time zone abbreviations in (western) Samoa to use "ST" and
3787ba2b2efdSGlen Barber    "DT" suffixes, as this is more likely to match common practice.
3788ba2b2efdSGlen Barber    Prefix "W" to (western) Samoa time when its standard-time offset
3789ba2b2efdSGlen Barber    disagrees with that of American Samoa.
3790ba2b2efdSGlen Barber
3791ba2b2efdSGlen Barber    America/Metlakatla now uses PST, not MeST, to abbreviate its time zone.
3792ba2b2efdSGlen Barber
3793ba2b2efdSGlen Barber    Time zone abbreviations have been updated for Japan's two time
3794ba2b2efdSGlen Barber    zones used 1896-1937.  JWST now stands for Western Standard
3795ba2b2efdSGlen Barber    Time, and JCST for Central Standard Time (formerly this was CJT).
3796ba2b2efdSGlen Barber    These abbreviations are now used for time in Korea, Taiwan,
3797ba2b2efdSGlen Barber    and Sakhalin while controlled by Japan.
3798ba2b2efdSGlen Barber
3799ba2b2efdSGlen Barber  Changes affecting past timestamps
3800ba2b2efdSGlen Barber
3801ba2b2efdSGlen Barber    China's five zones have been simplified to two, since the post-1970
3802ba2b2efdSGlen Barber    differences in the other three seem to have been imaginary.  The
3803ba2b2efdSGlen Barber    zones Asia/Harbin, Asia/Chongqing, and Asia/Kashgar have been
3804ba2b2efdSGlen Barber    removed; backwards-compatibility links still work, albeit with
3805ba2b2efdSGlen Barber    different behaviors for timestamps before May 1980.  Asia/Urumqi's
3806ba2b2efdSGlen Barber    1980 transition to UT +08 has been removed, so that it is now at
3807ba2b2efdSGlen Barber    +06 and not +08.  (Thanks to Luther Ma and to Alois Treindl;
3808ba2b2efdSGlen Barber    Treindl sent helpful translations of two papers by Guo Qingsheng.)
3809ba2b2efdSGlen Barber
3810ba2b2efdSGlen Barber    Some zones have been turned into links, when they differed from existing
3811f2fcff28SPhilip Paeps    zones only for older UT offsets where data entries were likely invented.
3812f2fcff28SPhilip Paeps    These changes affect UT offsets in pre-1970 timestamps only.  This is
3813ba2b2efdSGlen Barber    similar to the change in release 2013e, except this time for western
3814ba2b2efdSGlen Barber    Africa.  The affected zones are: Africa/Bamako, Africa/Banjul,
3815ba2b2efdSGlen Barber    Africa/Conakry, Africa/Dakar, Africa/Freetown, Africa/Lome,
3816ba2b2efdSGlen Barber    Africa/Nouakchott, Africa/Ouagadougou, Africa/Sao_Tome, and
3817ba2b2efdSGlen Barber    Atlantic/St_Helena.  This also affects the backwards-compatibility
3818ba2b2efdSGlen Barber    link Africa/Timbuktu.  (Thanks to Alan Barrett, Stephen Colebourne,
3819ba2b2efdSGlen Barber    Tim Parenti, and David Patte for reporting problems in earlier
3820ba2b2efdSGlen Barber    versions of this change.)
3821ba2b2efdSGlen Barber
3822ba2b2efdSGlen Barber    Asia/Shanghai's pre-standard-time UT offset has been changed from
3823ba2b2efdSGlen Barber    8:05:57 to 8:05:43, the location of Xujiahui Observatory.  Its
3824ba2b2efdSGlen Barber    transition to standard time has been changed from 1928 to 1901.
3825ba2b2efdSGlen Barber
3826ba2b2efdSGlen Barber    Asia/Taipei switched to JWST on 1896-01-01, then to JST on 1937-10-01,
3827ba2b2efdSGlen Barber    then to CST on 1945-09-21 at 01:00, and did not observe DST in 1945.
3828ba2b2efdSGlen Barber    In 1946 it observed DST from 05-15 through 09-30; in 1947
3829ba2b2efdSGlen Barber    from 04-15 through 10-31; and in 1979 from 07-01 through 09-30.
3830ba2b2efdSGlen Barber    (Thanks to Yu-Cheng Chuang.)
3831ba2b2efdSGlen Barber
3832ba2b2efdSGlen Barber    Asia/Riyadh's transition to standard time is now 1947-03-14, not 1950.
3833ba2b2efdSGlen Barber
3834ba2b2efdSGlen Barber    Europe/Helsinki's 1942 fall-back transition was 10-04 at 01:00, not
3835ba2b2efdSGlen Barber    10-03 at 00:00.  (Thanks to Konstantin Hyppönen.)
3836ba2b2efdSGlen Barber
3837ba2b2efdSGlen Barber    Pacific/Pago_Pago has been changed from UT -11:30 to -11 for the
3838ba2b2efdSGlen Barber    period from 1911 to 1950.
3839ba2b2efdSGlen Barber
3840ba2b2efdSGlen Barber    Pacific/Chatham has been changed to New Zealand standard time plus
3841ba2b2efdSGlen Barber    45 minutes for the period before 1957, reflecting a 1956 remark in
3842ba2b2efdSGlen Barber    the New Zealand parliament.
3843ba2b2efdSGlen Barber
3844ba2b2efdSGlen Barber    Europe/Budapest has several pre-1946 corrections: in 1918 the transition
3845ba2b2efdSGlen Barber    out of DST was on 09-16, not 09-29; in 1919 it was on 11-24, not 09-15; in
3846ba2b2efdSGlen Barber    1945 it was on 11-01, not 11-03; in 1941 the transition to DST was 04-08
3847ba2b2efdSGlen Barber    not 04-06 at 02:00; and there was no DST in 1920.
3848ba2b2efdSGlen Barber
3849ba2b2efdSGlen Barber    Africa/Accra is now assumed to have observed DST from 1920 through 1935.
3850ba2b2efdSGlen Barber
3851ba2b2efdSGlen Barber    Time in Russia before 1927 or so has been corrected by a few seconds in
3852ba2b2efdSGlen Barber    the following zones: Europe/Moscow, Asia/Irkutsk, Asia/Tbilisi,
3853ba2b2efdSGlen Barber    Asia/Tashkent, Asia/Vladivostok, Asia/Yekaterinburg, Europe/Helsinki, and
3854ba2b2efdSGlen Barber    Europe/Riga.  Also, Moscow's location has been changed to its Kilometer 0
3855ba2b2efdSGlen Barber    point.  (Thanks to Vladimir Karpinsky for the Moscow changes.)
3856ba2b2efdSGlen Barber
3857ba2b2efdSGlen Barber  Changes affecting data format
3858ba2b2efdSGlen Barber
3859ba2b2efdSGlen Barber    A new file 'zone1970.tab' supersedes 'zone.tab' in the installed data.
3860ba2b2efdSGlen Barber    The new file's extended format allows multiple country codes per zone.
3861ba2b2efdSGlen Barber    The older file is still installed but is deprecated; its format is
3862ba2b2efdSGlen Barber    not changing and it will still be distributed for a while, but new
3863ba2b2efdSGlen Barber    applications should use the new file.
3864ba2b2efdSGlen Barber
3865ba2b2efdSGlen Barber    The new file format simplifies maintenance of obscure locations.
3866ba2b2efdSGlen Barber    To test this, it adds coverage for the Crozet Islands and the
3867ba2b2efdSGlen Barber    Scattered Islands.  (Thanks to Tobias Conradi and Antoine Leca.)
3868ba2b2efdSGlen Barber
3869ba2b2efdSGlen Barber    The file 'iso3166.tab' is planned to switch from ASCII to UTF-8.
3870ba2b2efdSGlen Barber    It is still ASCII now, but commentary about the switch has been added.
3871ba2b2efdSGlen Barber    The new file 'zone1970.tab' already uses UTF-8.
3872ba2b2efdSGlen Barber
3873ba2b2efdSGlen Barber  Changes affecting code
3874ba2b2efdSGlen Barber
3875ba2b2efdSGlen Barber    'localtime', 'mktime', etc. now use much less stack space if ALL_STATE
3876ba2b2efdSGlen Barber    is defined.  (Thanks to Elliott Hughes for reporting the problem.)
3877ba2b2efdSGlen Barber
3878ba2b2efdSGlen Barber    'zic' no longer mishandles input when ignoring case in locales that
3879ba2b2efdSGlen Barber    are not compatible with English, e.g., unibyte Turkish locales when
3880ba2b2efdSGlen Barber    compiled with HAVE_GETTEXT.
3881ba2b2efdSGlen Barber
3882ba2b2efdSGlen Barber    Error diagnostics of 'zic' and 'yearistype' have been reworded so that
3883ba2b2efdSGlen Barber    they no longer use ASCII '-' as if it were a dash.
3884ba2b2efdSGlen Barber
3885ba2b2efdSGlen Barber    'zic' now rejects output file names that contain '.' or '..' components.
3886ba2b2efdSGlen Barber    (Thanks to Tim Parenti for reporting the problem.)
3887ba2b2efdSGlen Barber
3888ba2b2efdSGlen Barber    'zic -v' now warns about output file names that do not follow
3889ba2b2efdSGlen Barber    POSIX rules, or that contain a digit or '.'.  (Thanks to Arthur
3890ba2b2efdSGlen Barber    David Olson for starting the ball rolling on this.)
3891ba2b2efdSGlen Barber
3892ba2b2efdSGlen Barber    Some lint has been removed when using GCC_DEBUG_FLAGS with GCC 4.9.0.
3893ba2b2efdSGlen Barber
3894ba2b2efdSGlen Barber  Changes affecting build procedure
3895ba2b2efdSGlen Barber
3896ba2b2efdSGlen Barber    'zic' no longer links in localtime.o and asctime.o, as they're not needed.
3897ba2b2efdSGlen Barber    (Thanks to John Cochran.)
3898ba2b2efdSGlen Barber
3899ba2b2efdSGlen Barber  Changes affecting documentation and commentary
3900ba2b2efdSGlen Barber
3901ba2b2efdSGlen Barber    The 'Theory' file documents legacy names, the longstanding
3902ba2b2efdSGlen Barber    exceptions to the POSIX-inspired file name rules.
3903ba2b2efdSGlen Barber
3904ba2b2efdSGlen Barber    The 'zic' documentation clarifies the role of time types when
3905ba2b2efdSGlen Barber    interpreting dates.  (Thanks to Arthur David Olson.)
3906ba2b2efdSGlen Barber
3907ba2b2efdSGlen Barber    Documentation and commentary now prefer UTF-8 to US-ASCII,
3908ba2b2efdSGlen Barber    allowing the use of proper accents in foreign words and names.
3909ba2b2efdSGlen Barber    Code and data have not changed because of this.  (Thanks to
3910ba2b2efdSGlen Barber    Garrett Wollman, Ian Abbott, and Guy Harris for helping to debug
3911ba2b2efdSGlen Barber    this.)
3912ba2b2efdSGlen Barber
3913ba2b2efdSGlen Barber    Non-HTML documentation and commentary now use plain-text URLs instead of
3914ba2b2efdSGlen Barber    HTML insertions, and are more consistent about bracketing URLs when they
3915ba2b2efdSGlen Barber    are not already surrounded by white space.  (Thanks to suggestions by
3916ba2b2efdSGlen Barber    Steffen Nurpmeso.)
3917ba2b2efdSGlen Barber
3918ba2b2efdSGlen Barber    There is new commentary about Xujiahui Observatory, the five time-zone
3919ba2b2efdSGlen Barber    project in China from 1918 to 1949, timekeeping in Japanese-occupied
3920ba2b2efdSGlen Barber    Shanghai, and Tibet Time in the 1950s.  The sharp-eyed can spot the
3921ba2b2efdSGlen Barber    warlord Jin Shuren in the data.
3922ba2b2efdSGlen Barber
3923ba2b2efdSGlen Barber    Commentary about the coverage of each Russian zone has been standardized.
39242865ab3fSPhilip Paeps    (Thanks to Tim Parenti.)
3925ba2b2efdSGlen Barber
3926ba2b2efdSGlen Barber    There is new commentary about contemporary timekeeping in Ethiopia.
3927ba2b2efdSGlen Barber
3928ba2b2efdSGlen Barber    Obsolete comments about a 2007 proposal for DST in Kuwait has been removed.
3929ba2b2efdSGlen Barber
3930ba2b2efdSGlen Barber    There is new commentary about time in Poland in 1919.
3931ba2b2efdSGlen Barber
3932ba2b2efdSGlen Barber    Proper credit has been given to DST inventor George Vernon Hudson.
3933ba2b2efdSGlen Barber
3934ba2b2efdSGlen Barber    Commentary about time in Metlakatla, AK and Resolute, NU has been
3935ba2b2efdSGlen Barber    improved, with a new source for the former.
3936ba2b2efdSGlen Barber
3937ba2b2efdSGlen Barber    In zone.tab, Pacific/Easter no longer mentions Salas y Gómez, as it
3938ba2b2efdSGlen Barber    is uninhabited.
3939ba2b2efdSGlen Barber
3940ba2b2efdSGlen Barber    Commentary about permanent Antarctic bases has been updated.
3941ba2b2efdSGlen Barber
3942ba2b2efdSGlen Barber    Several typos have been corrected.  (Thanks to Tim Parenti for
3943ba2b2efdSGlen Barber    contributing some of these fixes.)
3944ba2b2efdSGlen Barber
3945ba2b2efdSGlen Barber    tz-link.htm now mentions the JavaScript libraries Moment Timezone,
3946ba2b2efdSGlen Barber    TimezoneJS.Date, Walltime-js, and Timezone.  (Thanks to a heads-up
3947ba2b2efdSGlen Barber    from Matt Johnson.)  Also, it mentions the Go 'latlong' package.
3948ba2b2efdSGlen Barber    (Thanks to a heads-up from Dirkjan Ochtman.)
3949ba2b2efdSGlen Barber
3950ba2b2efdSGlen Barber    The files usno1988, usno1989, usno1989a, usno1995, usno1997, and usno1998
3951ba2b2efdSGlen Barber    have been removed.  These obsolescent US Naval Observatory entries were no
3952ba2b2efdSGlen Barber    longer helpful for maintenance.  (Thanks to Tim Parenti for the suggestion.)
3953ba2b2efdSGlen Barber
3954ba2b2efdSGlen Barber
3955ba2b2efdSGlen BarberRelease 2014e - 2014-06-12 21:53:52 -0700
3956ba2b2efdSGlen Barber
3957ba2b2efdSGlen Barber  Changes affecting near-future timestamps
3958ba2b2efdSGlen Barber
3959ba2b2efdSGlen Barber    Egypt's 2014 Ramadan-based transitions are June 26 and July 31 at 24:00.
3960ba2b2efdSGlen Barber    (Thanks to Imed Chihi.)  Guess that from 2015 on Egypt will temporarily
3961ba2b2efdSGlen Barber    switch to standard time at 24:00 the last Thursday before Ramadan, and
3962ba2b2efdSGlen Barber    back to DST at 00:00 the first Friday after Ramadan.
3963ba2b2efdSGlen Barber
3964ba2b2efdSGlen Barber    Similarly, Morocco's are June 28 at 03:00 and August 2 at 02:00.  (Thanks
3965ba2b2efdSGlen Barber    to Milamber Space Network.)  Guess that from 2015 on Morocco will
3966ba2b2efdSGlen Barber    temporarily switch to standard time at 03:00 the last Saturday before
3967ba2b2efdSGlen Barber    Ramadan, and back to DST at 02:00 the first Saturday after Ramadan.
3968ba2b2efdSGlen Barber
3969ba2b2efdSGlen Barber  Changes affecting past timestamps
3970ba2b2efdSGlen Barber
3971ba2b2efdSGlen Barber    The abbreviation "MSM" (Moscow Midsummer Time) is now used instead of
3972ba2b2efdSGlen Barber    "MSD" for Moscow's double daylight time in summer 1921.  Also, a typo
3973ba2b2efdSGlen Barber    "VLASST" has been repaired to be "VLAST" for Vladivostok summer time
3974ba2b2efdSGlen Barber    in 1991.  (Thanks to Hank W. for reporting the problems.)
3975ba2b2efdSGlen Barber
3976ba2b2efdSGlen Barber  Changes affecting commentary
3977ba2b2efdSGlen Barber
3978ba2b2efdSGlen Barber    tz-link.htm now cites RFC 7265 for jCal, mentions PTP and the
3979ba2b2efdSGlen Barber    draft CalDAV extension, updates URLs for TSP, TZInfo, IATA, and
3980ba2b2efdSGlen Barber    removes stale pointers to World Time Explorer and WORLDTIME.
3981ba2b2efdSGlen Barber
3982ba2b2efdSGlen Barber
3983ba2b2efdSGlen BarberRelease 2014d - 2014-05-27 21:34:40 -0700
3984ba2b2efdSGlen Barber
3985ba2b2efdSGlen Barber  Changes affecting code
3986ba2b2efdSGlen Barber
3987ba2b2efdSGlen Barber    zic no longer generates files containing timestamps before the Big Bang.
398889abb9f8SPhilip Paeps    This works around GNOME glib bug 878
398989abb9f8SPhilip Paeps    <https://gitlab.gnome.org/GNOME/glib/issues/878>
3990ba2b2efdSGlen Barber    (Thanks to Leonardo Chiquitto for reporting the bug, and to
3991ba2b2efdSGlen Barber    Arthur David Olson and James Cloos for suggesting improvements to the fix.)
3992ba2b2efdSGlen Barber
3993ba2b2efdSGlen Barber  Changes affecting documentation
3994ba2b2efdSGlen Barber
3995ba2b2efdSGlen Barber    tz-link.htm now mentions GNOME.
3996ba2b2efdSGlen Barber
3997ba2b2efdSGlen Barber
3998ba2b2efdSGlen BarberRelease 2014c - 2014-05-13 07:44:13 -0700
3999ba2b2efdSGlen Barber
4000ba2b2efdSGlen Barber  Changes affecting near-future timestamps
4001ba2b2efdSGlen Barber
4002ba2b2efdSGlen Barber    Egypt observes DST starting 2014-05-15 at 24:00.
4003ba2b2efdSGlen Barber    (Thanks to Ahmad El-Dardiry and Gunther Vermier.)
4004ba2b2efdSGlen Barber    Details have not been announced, except that DST will not be observed
4005ba2b2efdSGlen Barber    during Ramadan.  Guess that DST will stop during the same Ramadan dates as
4006ba2b2efdSGlen Barber    Morocco, and that Egypt's future spring and fall transitions will be the
4007ba2b2efdSGlen Barber    same as 2010 when it last observed DST, namely April's last Friday at
4008ba2b2efdSGlen Barber    00:00 to September's last Thursday at 23:00 standard time.  Also, guess
4009ba2b2efdSGlen Barber    that Ramadan transitions will be at 00:00 standard time.
4010ba2b2efdSGlen Barber
4011ba2b2efdSGlen Barber  Changes affecting code
4012ba2b2efdSGlen Barber
4013ba2b2efdSGlen Barber    zic now generates transitions for minimum time values, eliminating guesswork
4014ba2b2efdSGlen Barber    when handling low-valued timestamps.  (Thanks to Arthur David Olson.)
4015ba2b2efdSGlen Barber
4016ba2b2efdSGlen Barber    Port to Cygwin sans glibc.  (Thanks to Arthur David Olson.)
4017ba2b2efdSGlen Barber
4018ba2b2efdSGlen Barber  Changes affecting commentary and documentation
4019ba2b2efdSGlen Barber
4020ba2b2efdSGlen Barber    Remove now-confusing comment about Jordan.  (Thanks to Oleksii Nochovnyi.)
4021ba2b2efdSGlen Barber
4022ba2b2efdSGlen Barber
4023ba2b2efdSGlen BarberRelease 2014b - 2014-03-24 21:28:50 -0700
4024ba2b2efdSGlen Barber
4025ba2b2efdSGlen Barber  Changes affecting near-future timestamps
4026ba2b2efdSGlen Barber
4027ba2b2efdSGlen Barber    Crimea switches to Moscow time on 2014-03-30 at 02:00 local time.
4028ba2b2efdSGlen Barber    (Thanks to Alexander Krivenyshev.)  Move its zone.tab entry from UA to RU.
4029ba2b2efdSGlen Barber
4030ba2b2efdSGlen Barber    New entry for Troll station, Antarctica.  (Thanks to Paul-Inge Flakstad and
4031ba2b2efdSGlen Barber    Bengt-Inge Larsson.)  This is currently an approximation; a better version
4032ba2b2efdSGlen Barber    will require the zic and localtime fixes mentioned below, and the plan is
4033ba2b2efdSGlen Barber    to wait for a while until at least the zic fixes propagate.
4034ba2b2efdSGlen Barber
4035ba2b2efdSGlen Barber  Changes affecting code
4036ba2b2efdSGlen Barber
4037ba2b2efdSGlen Barber    'zic' and 'localtime' no longer reject locations needing four transitions
4038ba2b2efdSGlen Barber    per year for the foreseeable future.  (Thanks to Andrew Main (Zefram).)
4039ba2b2efdSGlen Barber    Also, 'zic' avoids some unlikely failures due to integer overflow.
4040ba2b2efdSGlen Barber
4041ba2b2efdSGlen Barber  Changes affecting build procedure
4042ba2b2efdSGlen Barber
4043ba2b2efdSGlen Barber    'make check' now detects Rule lines defined but never used.
4044ba2b2efdSGlen Barber    The NZAQ rules, an instance of this problem, have been removed.
4045ba2b2efdSGlen Barber
4046ba2b2efdSGlen Barber  Changes affecting commentary and documentation
4047ba2b2efdSGlen Barber
4048ba2b2efdSGlen Barber    Fix Tuesday/Thursday typo in description of time in Israel.
4049ba2b2efdSGlen Barber    (Thanks to Bert Katz via Pavel Kharitonov and Mike Frysinger.)
4050ba2b2efdSGlen Barber
4051ba2b2efdSGlen Barber    Microsoft Windows 8.1 doesn't support tz database names.  (Thanks
4052ba2b2efdSGlen Barber    to Donald MacQueen.)  Instead, the Microsoft Windows Store app
4053ba2b2efdSGlen Barber    library supports them.
4054ba2b2efdSGlen Barber
4055ba2b2efdSGlen Barber    Add comments about Johnston Island time in the 1960s.
4056ba2b2efdSGlen Barber    (Thanks to Lyle McElhaney.)
4057ba2b2efdSGlen Barber
4058ba2b2efdSGlen Barber    Morocco's 2014 DST start will be as predicted.
4059ba2b2efdSGlen Barber    (Thanks to Sebastien Willemijns.)
4060ba2b2efdSGlen Barber
4061ba2b2efdSGlen Barber
4062ba2b2efdSGlen BarberRelease 2014a - 2014-03-07 23:30:29 -0800
4063ba2b2efdSGlen Barber
4064ba2b2efdSGlen Barber  Changes affecting near-future timestamps
4065ba2b2efdSGlen Barber
4066ba2b2efdSGlen Barber    Turkey begins DST on 2014-03-31, not 03-30.  (Thanks to Faruk Pasin for
4067ba2b2efdSGlen Barber    the heads-up, and to Tim Parenti for simplifying the update.)
4068ba2b2efdSGlen Barber
4069ba2b2efdSGlen Barber  Changes affecting past timestamps
4070ba2b2efdSGlen Barber
4071259e2ad7SPhilip Paeps    Fiji ended DST on 2014-01-19 at 02:00, not the previously scheduled 03:00.
4072ba2b2efdSGlen Barber    (Thanks to Steffen Thorsen.)
4073ba2b2efdSGlen Barber
4074ba2b2efdSGlen Barber    Ukraine switched from Moscow to Eastern European time on 1990-07-01
4075ba2b2efdSGlen Barber    (not 1992-01-01), and observed DST during the entire next winter.
4076ba2b2efdSGlen Barber    (Thanks to Vladimir in Moscow via Alois Treindl.)
4077ba2b2efdSGlen Barber
4078ba2b2efdSGlen Barber    In 1988 Israel observed DST from 04-10 to 09-04, not 04-09 to 09-03.
4079ba2b2efdSGlen Barber    (Thanks to Avigdor Finkelstein.)
4080ba2b2efdSGlen Barber
4081ba2b2efdSGlen Barber  Changes affecting code
4082ba2b2efdSGlen Barber
4083ba2b2efdSGlen Barber    A uninitialized-storage bug in 'localtime' has been fixed.
4084ba2b2efdSGlen Barber    (Thanks to Logan Chien.)
4085ba2b2efdSGlen Barber
4086ba2b2efdSGlen Barber  Changes affecting the build procedure
4087ba2b2efdSGlen Barber
4088ba2b2efdSGlen Barber    The settings for 'make check_web' now default to Ubuntu 13.10.
4089ba2b2efdSGlen Barber
4090ba2b2efdSGlen Barber  Changes affecting commentary and documentation
4091ba2b2efdSGlen Barber
4092ba2b2efdSGlen Barber    The boundary of the US Pacific time zone is given more accurately.
4093ba2b2efdSGlen Barber    (Thanks to Alan Mintz.)
4094ba2b2efdSGlen Barber
4095ba2b2efdSGlen Barber    Chile's 2014 DST will be as predicted.  (Thanks to José Miguel Garrido.)
4096ba2b2efdSGlen Barber
4097ba2b2efdSGlen Barber    Paraguay's 2014 DST will be as predicted.  (Thanks to Carlos Raúl Perasso.)
4098ba2b2efdSGlen Barber
4099ba2b2efdSGlen Barber    Better descriptions of countries with same time zone history as
4100ba2b2efdSGlen Barber    Trinidad and Tobago since 1970.  (Thanks to Alan Barrett for suggestion.)
4101ba2b2efdSGlen Barber
4102ba2b2efdSGlen Barber    Several changes affect tz-link.htm, the main web page.
4103ba2b2efdSGlen Barber
4104ba2b2efdSGlen Barber      Mention Time.is (thanks to Even Scharning) and WX-now (thanks to
4105ba2b2efdSGlen Barber      David Braverman).
4106ba2b2efdSGlen Barber
4107ba2b2efdSGlen Barber      Mention xCal (Internet RFC 6321) and jCal.
4108ba2b2efdSGlen Barber
4109ba2b2efdSGlen Barber      Microsoft has some support for tz database names.
4110ba2b2efdSGlen Barber
4111ba2b2efdSGlen Barber      CLDR data formats include both XML and JSON.
4112ba2b2efdSGlen Barber
4113ba2b2efdSGlen Barber      Mention Maggiolo's map of solar vs standard time.
4114ba2b2efdSGlen Barber      (Thanks to Arthur David Olson.)
4115ba2b2efdSGlen Barber
4116ba2b2efdSGlen Barber      Mention TZ4Net.  (Thanks to Matt Johnson.)
4117ba2b2efdSGlen Barber
4118ba2b2efdSGlen Barber      Mention the timezone-olson Haskell package.
4119ba2b2efdSGlen Barber
4120ba2b2efdSGlen Barber      Mention zeitverschiebung.net.  (Thanks to Martin Jäger.)
4121ba2b2efdSGlen Barber
4122ba2b2efdSGlen Barber      Remove moribund links to daylight-savings-time.info and to
4123ba2b2efdSGlen Barber      Simple Timer + Clocks.
4124ba2b2efdSGlen Barber
4125ba2b2efdSGlen Barber      Update two links.  (Thanks to Oscar van Vlijmen.)
4126ba2b2efdSGlen Barber
4127ba2b2efdSGlen Barber      Fix some formatting glitches, e.g., remove random newlines from
4128ba2b2efdSGlen Barber      abbr elements' title attributes.
4129ba2b2efdSGlen Barber
4130ba2b2efdSGlen Barber
4131ba2b2efdSGlen BarberRelease 2013i - 2013-12-17 07:25:23 -0800
4132ba2b2efdSGlen Barber
4133ba2b2efdSGlen Barber  Changes affecting near-future timestamps:
4134ba2b2efdSGlen Barber
4135ba2b2efdSGlen Barber    Jordan switches back to standard time at 00:00 on December 20, 2013.
4136ba2b2efdSGlen Barber    The 2006-2011 transition schedule is planned to resume in 2014.
4137ba2b2efdSGlen Barber    (Thanks to Steffen Thorsen.)
4138ba2b2efdSGlen Barber
4139ba2b2efdSGlen Barber  Changes affecting past timestamps:
4140ba2b2efdSGlen Barber
4141ba2b2efdSGlen Barber    In 2004, Cuba began DST on March 28, not April 4.
4142ba2b2efdSGlen Barber    (Thanks to Steffen Thorsen.)
4143ba2b2efdSGlen Barber
4144ba2b2efdSGlen Barber  Changes affecting code
4145ba2b2efdSGlen Barber
4146ba2b2efdSGlen Barber    The compile-time flag NOSOLAR has been removed, as nowadays the
4147ba2b2efdSGlen Barber    benefit of slightly shrinking runtime table size is outweighed by the
4148ba2b2efdSGlen Barber    cost of disallowing potential future updates that exceed old limits.
4149ba2b2efdSGlen Barber
4150ba2b2efdSGlen Barber  Changes affecting documentation and commentary
4151ba2b2efdSGlen Barber
4152ba2b2efdSGlen Barber    The files solar87, solar88, and solar89 are no longer distributed.
4153ba2b2efdSGlen Barber    They were a negative experiment - that is, a demonstration that
4154ba2b2efdSGlen Barber    tz data can represent solar time only with some difficulty and error.
4155ba2b2efdSGlen Barber    Their presence in the distribution caused confusion, as Riyadh
4156ba2b2efdSGlen Barber    civil time was generally not solar time in those years.
4157ba2b2efdSGlen Barber
4158ba2b2efdSGlen Barber    tz-link.htm now mentions Noda Time.  (Thanks to Matt Johnson.)
4159ba2b2efdSGlen Barber
4160ba2b2efdSGlen Barber
4161ba2b2efdSGlen BarberRelease 2013h - 2013-10-25 15:32:32 -0700
4162ba2b2efdSGlen Barber
4163ba2b2efdSGlen Barber  Changes affecting current and future timestamps:
4164ba2b2efdSGlen Barber
4165ba2b2efdSGlen Barber    Libya has switched its UT offset back to +02 without DST, instead
4166ba2b2efdSGlen Barber    of +01 with DST.  (Thanks to Even Scharning.)
4167ba2b2efdSGlen Barber
4168ba2b2efdSGlen Barber    Western Sahara (Africa/El_Aaiun) uses Morocco's DST rules.
4169ba2b2efdSGlen Barber    (Thanks to Gwillim Law.)
4170ba2b2efdSGlen Barber
4171ba2b2efdSGlen Barber  Changes affecting future timestamps:
4172ba2b2efdSGlen Barber
4173ba2b2efdSGlen Barber    Acre and (we guess) western Amazonas will switch from UT -04 to -05
4174ba2b2efdSGlen Barber    on 2013-11-10.  This affects America/Rio_Branco and America/Eirunepe.
4175ba2b2efdSGlen Barber    (Thanks to Steffen Thorsen.)
4176ba2b2efdSGlen Barber
4177ba2b2efdSGlen Barber    Add entries for DST transitions in Morocco in the year 2038.
4178ba2b2efdSGlen Barber    This avoids some year-2038 glitches introduced in 2013g.
4179ba2b2efdSGlen Barber    (Thanks to Yoshito Umaoka for reporting the problem.)
4180ba2b2efdSGlen Barber
4181ba2b2efdSGlen Barber  Changes affecting API
4182ba2b2efdSGlen Barber
4183ba2b2efdSGlen Barber    The 'tzselect' command no longer requires the 'select' command,
4184ba2b2efdSGlen Barber    and should now work with /bin/sh on more platforms.  It also works
4185ba2b2efdSGlen Barber    around a bug in BusyBox awk before version 1.21.0.  (Thanks to
4186ba2b2efdSGlen Barber    Patrick 'P. J.' McDermott and Alan Barrett.)
4187ba2b2efdSGlen Barber
4188ba2b2efdSGlen Barber  Changes affecting code
4189ba2b2efdSGlen Barber
4190ba2b2efdSGlen Barber    Fix localtime overflow bugs with 32-bit unsigned time_t.
4191ba2b2efdSGlen Barber
4192ba2b2efdSGlen Barber    zdump no longer assumes sscanf returns maximal values on overflow.
4193ba2b2efdSGlen Barber
4194ba2b2efdSGlen Barber  Changes affecting the build procedure
4195ba2b2efdSGlen Barber
4196ba2b2efdSGlen Barber    The builder can specify which programs to use, if any, instead of
4197ba2b2efdSGlen Barber    'ar' and 'ranlib', and libtz.a is now built locally before being
4198ba2b2efdSGlen Barber    installed.  (Thanks to Michael Forney.)
4199ba2b2efdSGlen Barber
4200ba2b2efdSGlen Barber    A dependency typo in the 'zdump' rule has been fixed.
4201ba2b2efdSGlen Barber    (Thanks to Andrew Paprocki.)
4202ba2b2efdSGlen Barber
4203ba2b2efdSGlen Barber    The Makefile has been simplified by assuming that 'mkdir -p' and 'cp -f'
4204ba2b2efdSGlen Barber    work as specified by POSIX.2-1992 or later; this is portable nowadays.
4205ba2b2efdSGlen Barber
4206ba2b2efdSGlen Barber    'make clean' no longer removes 'leapseconds', since it's
4207ba2b2efdSGlen Barber    host-independent and is part of the distribution.
4208ba2b2efdSGlen Barber
4209ba2b2efdSGlen Barber    The unused makefile macros TZCSRCS, TZDSRCS, DATESRCS have been removed.
4210ba2b2efdSGlen Barber
4211ba2b2efdSGlen Barber  Changes affecting documentation and commentary
4212ba2b2efdSGlen Barber
4213ba2b2efdSGlen Barber    tz-link.htm now mentions TC TIMEZONE's draft time zone service protocol
4214ba2b2efdSGlen Barber    (thanks to Mike Douglass) and TimezoneJS.Date (thanks to Jim Fehrle).
4215ba2b2efdSGlen Barber
4216ba2b2efdSGlen Barber    Update URLs in tz-link page.  Add URLs for Microsoft Windows, since
4217ba2b2efdSGlen Barber    8.1 introduces tz support.  Remove URLs for Tru64 and UnixWare (no
4218ba2b2efdSGlen Barber    longer maintained) and for old advisories.  SOFA now does C.
4219ba2b2efdSGlen Barber
4220ba2b2efdSGlen BarberRelease 2013g - 2013-09-30 21:08:26 -0700
4221ba2b2efdSGlen Barber
4222ba2b2efdSGlen Barber  Changes affecting current and near-future timestamps
4223ba2b2efdSGlen Barber
4224ba2b2efdSGlen Barber    Morocco now observes DST from the last Sunday in March to the last
4225ba2b2efdSGlen Barber    Sunday in October, not April to September respectively.  (Thanks
4226ba2b2efdSGlen Barber    to Steffen Thorsen.)
4227ba2b2efdSGlen Barber
4228ba2b2efdSGlen Barber  Changes affecting 'zic'
4229ba2b2efdSGlen Barber
4230ba2b2efdSGlen Barber    'zic' now runs on platforms that lack both hard links and symlinks.
4231ba2b2efdSGlen Barber    (Thanks to Theo Veenker for reporting the problem, for MinGW.)
4232ba2b2efdSGlen Barber    Also, fix some bugs on platforms that lack hard links but have symlinks.
4233ba2b2efdSGlen Barber
4234ba2b2efdSGlen Barber    'zic -v' again warns that Asia/Tehran has no POSIX environment variable
4235ba2b2efdSGlen Barber    to predict the far future, fixing a bug introduced in 2013e.
4236ba2b2efdSGlen Barber
4237ba2b2efdSGlen Barber  Changes affecting the build procedure
4238ba2b2efdSGlen Barber
4239ba2b2efdSGlen Barber    The 'leapseconds' file is again put into the tzdata tarball.
4240ba2b2efdSGlen Barber    Also, 'leapseconds.awk', so tzdata is self-contained.  (Thanks to
4241ba2b2efdSGlen Barber    Matt Burgess and Ian Abbott.)  The timestamps of these and other
4242ba2b2efdSGlen Barber    dependent files in tarballs are adjusted more consistently.
4243ba2b2efdSGlen Barber
4244ba2b2efdSGlen Barber  Changes affecting documentation and commentary
4245ba2b2efdSGlen Barber
4246ba2b2efdSGlen Barber    The README file is now part of the data tarball as well as the code.
4247ba2b2efdSGlen Barber    It now states that files are public domain unless otherwise specified.
4248ba2b2efdSGlen Barber    (Thanks to Andrew Main (Zefram) for asking for clarifications.)
4249ba2b2efdSGlen Barber    Its details about the 1989 release moved to a place of honor near
4250ba2b2efdSGlen Barber    the end of NEWS.
4251ba2b2efdSGlen Barber
4252ba2b2efdSGlen Barber
4253ba2b2efdSGlen BarberRelease 2013f - 2013-09-24 23:37:36 -0700
4254ba2b2efdSGlen Barber
4255ba2b2efdSGlen Barber  Changes affecting near-future timestamps
4256ba2b2efdSGlen Barber
4257ba2b2efdSGlen Barber    Tocantins will very likely not observe DST starting this spring.
4258ba2b2efdSGlen Barber    (Thanks to Steffen Thorsen.)
4259ba2b2efdSGlen Barber
4260ba2b2efdSGlen Barber    Jordan will likely stay at UT +03 indefinitely, and will not fall
4261ba2b2efdSGlen Barber    back this fall.
4262ba2b2efdSGlen Barber
4263ba2b2efdSGlen Barber    Palestine will fall back at 00:00, not 01:00.  (Thanks to Steffen Thorsen.)
4264ba2b2efdSGlen Barber
4265ba2b2efdSGlen Barber  Changes affecting API
4266ba2b2efdSGlen Barber
4267ba2b2efdSGlen Barber    The types of the global variables 'timezone' and 'altzone' (if present)
4268ba2b2efdSGlen Barber    have been changed back to 'long'.  This is required for 'timezone'
4269ba2b2efdSGlen Barber    by POSIX, and for 'altzone' by common practice, e.g., Solaris 11.
4270ba2b2efdSGlen Barber    These variables were originally 'long' in the tz code, but were
4271ba2b2efdSGlen Barber    mistakenly changed to 'time_t' in 1987; nobody reported the
4272ba2b2efdSGlen Barber    incompatibility until now.  The difference matters on x32, where
4273ba2b2efdSGlen Barber    'long' is 32 bits and 'time_t' is 64.  (Thanks to Elliott Hughes.)
4274ba2b2efdSGlen Barber
4275ba2b2efdSGlen Barber  Changes affecting the build procedure
4276ba2b2efdSGlen Barber
4277ba2b2efdSGlen Barber    Avoid long strings in leapseconds.awk to work around a mawk bug.
4278ba2b2efdSGlen Barber    (Thanks to Cyril Baurand.)
4279ba2b2efdSGlen Barber
4280ba2b2efdSGlen Barber  Changes affecting documentation and commentary
4281ba2b2efdSGlen Barber
4282ba2b2efdSGlen Barber    New file 'NEWS' that contains release notes like this one.
4283ba2b2efdSGlen Barber
4284ba2b2efdSGlen Barber    Paraguay's law does not specify DST transition time; 00:00 is customary.
4285ba2b2efdSGlen Barber    (Thanks to Waldemar Villamayor-Venialbo.)
4286ba2b2efdSGlen Barber
4287ba2b2efdSGlen Barber    Minor capitalization fixes.
4288ba2b2efdSGlen Barber
4289ba2b2efdSGlen Barber  Changes affecting version-control only
4290ba2b2efdSGlen Barber
4291ba2b2efdSGlen Barber    The experimental GitHub repository now contains annotated and
4292ba2b2efdSGlen Barber    signed tags for recent releases, e.g., '2013e' for Release 2013e.
4293ba2b2efdSGlen Barber    Releases are tagged starting with 2012e; earlier releases were
4294ba2b2efdSGlen Barber    done differently, and tags would either not have a simple name or
4295ba2b2efdSGlen Barber    not exactly match what was released.
4296ba2b2efdSGlen Barber
4297ba2b2efdSGlen Barber    'make set-timestamps' is now simpler and a bit more portable.
4298ba2b2efdSGlen Barber
4299ba2b2efdSGlen Barber
4300ba2b2efdSGlen BarberRelease 2013e - 2013-09-19 23:50:04 -0700
4301ba2b2efdSGlen Barber
4302ba2b2efdSGlen Barber  Changes affecting near-future timestamps
4303ba2b2efdSGlen Barber
4304ba2b2efdSGlen Barber    This year Fiji will start DST on October 27, not October 20.
4305ba2b2efdSGlen Barber    (Thanks to David Wheeler for the heads-up.)  For now, guess that
4306ba2b2efdSGlen Barber    Fiji will continue to spring forward the Sunday before the fourth
4307ba2b2efdSGlen Barber    Monday in October.
4308ba2b2efdSGlen Barber
4309ba2b2efdSGlen Barber  Changes affecting current and future time zone abbreviations
4310ba2b2efdSGlen Barber
4311ba2b2efdSGlen Barber    Use WIB/WITA/WIT rather than WIT/CIT/EIT for alphabetic Indonesian
4312ba2b2efdSGlen Barber    time zone abbreviations since 1932.  (Thanks to George Ziegler,
4313ba2b2efdSGlen Barber    Priyadi Iman Nurcahyo, Zakaria, Jason Grimes, Martin Pitt, and
4314ba2b2efdSGlen Barber    Benny Lin.)  This affects Asia/Dili, Asia/Jakarta, Asia/Jayapura,
4315ba2b2efdSGlen Barber    Asia/Makassar, and Asia/Pontianak.
4316ba2b2efdSGlen Barber
4317ba2b2efdSGlen Barber    Use ART (UT -03, standard time), rather than WARST (also -03, but
4318ba2b2efdSGlen Barber    daylight saving time) for San Luis, Argentina since 2009.
4319ba2b2efdSGlen Barber
4320ba2b2efdSGlen Barber  Changes affecting Godthåb timestamps after 2037 if version mismatch
4321ba2b2efdSGlen Barber
4322ba2b2efdSGlen Barber    Allow POSIX-like TZ strings where the transition time's hour can
4323ba2b2efdSGlen Barber    range from -167 through 167, instead of the POSIX-required 0
4324ba2b2efdSGlen Barber    through 24.  E.g., TZ='FJT-12FJST,M10.3.1/146,M1.3.4/75' for the
4325259e2ad7SPhilip Paeps    new Fiji rules.  This is a more compact way to represent
4326ba2b2efdSGlen Barber    far-future timestamps for America/Godthab, America/Santiago,
4327ba2b2efdSGlen Barber    Antarctica/Palmer, Asia/Gaza, Asia/Hebron, Asia/Jerusalem,
4328ba2b2efdSGlen Barber    Pacific/Easter, and Pacific/Fiji.  Other zones are unaffected by
4329ba2b2efdSGlen Barber    this change.  (Derived from a suggestion by Arthur David Olson.)
4330ba2b2efdSGlen Barber
4331ba2b2efdSGlen Barber    Allow POSIX-like TZ strings where daylight saving time is in
4332ba2b2efdSGlen Barber    effect all year.  E.g., TZ='WART4WARST,J1/0,J365/25' for Western
4333259e2ad7SPhilip Paeps    Argentina Summer Time all year.  This supports a more compact way
4334ba2b2efdSGlen Barber    to represent the 2013d data for America/Argentina/San_Luis.
4335ba2b2efdSGlen Barber    Because of the change for San Luis noted above this change does not
4336ba2b2efdSGlen Barber    affect the current data.  (Thanks to Andrew Main (Zefram) for
4337ba2b2efdSGlen Barber    suggestions that improved this change.)
4338ba2b2efdSGlen Barber
4339ba2b2efdSGlen Barber    Where these two TZ changes take effect, there is a minor extension
4340ba2b2efdSGlen Barber    to the tz file format in that it allows new values for the
4341ba2b2efdSGlen Barber    embedded TZ-format string, and the tz file format version number
4342ba2b2efdSGlen Barber    has therefore been increased from 2 to 3 as a precaution.
4343ba2b2efdSGlen Barber    Version-2-based client code should continue to work as before for
4344ba2b2efdSGlen Barber    all timestamps before 2038.  Existing version-2-based client code
4345ba2b2efdSGlen Barber    (tzcode, GNU/Linux, Solaris) has been tested on version-3-format
4346ba2b2efdSGlen Barber    files, and typically works in practice even for timestamps after
4347ba2b2efdSGlen Barber    2037; the only known exception is America/Godthab.
4348ba2b2efdSGlen Barber
4349ba2b2efdSGlen Barber  Changes affecting timestamps before 1970
4350ba2b2efdSGlen Barber
4351ba2b2efdSGlen Barber    Pacific/Johnston is now a link to Pacific/Honolulu.  This corrects
4352ba2b2efdSGlen Barber    some errors before 1947.
4353ba2b2efdSGlen Barber
4354ba2b2efdSGlen Barber    Some zones have been turned into links, when they differ from existing
4355ba2b2efdSGlen Barber    zones only in older data entries that were likely invented or that
4356ba2b2efdSGlen Barber    differ only in LMT or transitions from LMT.  These changes affect
4357ba2b2efdSGlen Barber    only timestamps before 1943.  The affected zones are:
4358ba2b2efdSGlen Barber    Africa/Juba, America/Anguilla, America/Aruba, America/Dominica,
4359ba2b2efdSGlen Barber    America/Grenada, America/Guadeloupe, America/Marigot,
4360ba2b2efdSGlen Barber    America/Montserrat, America/St_Barthelemy, America/St_Kitts,
4361ba2b2efdSGlen Barber    America/St_Lucia, America/St_Thomas, America/St_Vincent,
4362ba2b2efdSGlen Barber    America/Tortola, and Europe/Vaduz.  (Thanks to Alois Treindl for
4363ba2b2efdSGlen Barber    confirming that the old Europe/Vaduz zone was wrong and the new
4364ba2b2efdSGlen Barber    link is better for WWII-era times.)
4365ba2b2efdSGlen Barber
4366ba2b2efdSGlen Barber    Change Kingston Mean Time from -5:07:12 to -5:07:11.  This affects
4367ba2b2efdSGlen Barber    America/Cayman, America/Jamaica and America/Grand_Turk timestamps
4368ba2b2efdSGlen Barber    from 1890 to 1912.
4369ba2b2efdSGlen Barber
4370ba2b2efdSGlen Barber    Change the UT offset of Bern Mean Time from 0:29:44 to 0:29:46.
4371ba2b2efdSGlen Barber    This affects Europe/Zurich timestamps from 1853 to 1894.  (Thanks
43722865ab3fSPhilip Paeps    to Alois Treindl.)
4373ba2b2efdSGlen Barber
4374ba2b2efdSGlen Barber    Change the date of the circa-1850 Zurich transition from 1849-09-12
4375ba2b2efdSGlen Barber    to 1853-07-16, overriding Shanks with data from Messerli about
4376ba2b2efdSGlen Barber    postal and telegraph time in Switzerland.
4377ba2b2efdSGlen Barber
4378ba2b2efdSGlen Barber  Changes affecting time zone abbreviations before 1970
4379ba2b2efdSGlen Barber
4380ba2b2efdSGlen Barber    For Asia/Jakarta, use BMT (not JMT) for mean time from 1923 to 1932,
4381ba2b2efdSGlen Barber    as Jakarta was called Batavia back then.
4382ba2b2efdSGlen Barber
4383ba2b2efdSGlen Barber  Changes affecting API
4384ba2b2efdSGlen Barber
4385ba2b2efdSGlen Barber    The 'zic' command now outputs a dummy transition when far-future
4386ba2b2efdSGlen Barber    data can't be summarized using a TZ string, and uses a 402-year
4387ba2b2efdSGlen Barber    window rather than a 400-year window.  For the current data, this
4388ba2b2efdSGlen Barber    affects only the Asia/Tehran file.  It does not affect any of the
4389ba2b2efdSGlen Barber    timestamps that this file represents, so zdump outputs the same
4390ba2b2efdSGlen Barber    information as before.  (Thanks to Andrew Main (Zefram).)
4391ba2b2efdSGlen Barber
4392ba2b2efdSGlen Barber    The 'date' command has a new '-r' option, which lets you specify
4393ba2b2efdSGlen Barber    the integer time to display, a la FreeBSD.
4394ba2b2efdSGlen Barber
4395ba2b2efdSGlen Barber    The 'tzselect' command has two new options '-c' and '-n', which lets you
4396ba2b2efdSGlen Barber    select a zone based on latitude and longitude.
4397ba2b2efdSGlen Barber
4398ba2b2efdSGlen Barber    The 'zic' command's '-v' option now warns about constructs that
4399ba2b2efdSGlen Barber    require the new version-3 binary file format.  (Thanks to Arthur
4400ba2b2efdSGlen Barber    David Olson for the suggestion.)
4401ba2b2efdSGlen Barber
4402ba2b2efdSGlen Barber    Support for floating-point time_t has been removed.
4403ba2b2efdSGlen Barber    It was always dicey, and POSIX no longer requires it.
4404ba2b2efdSGlen Barber    (Thanks to Eric Blake for suggesting to the POSIX committee to
4405ba2b2efdSGlen Barber    remove it, and thanks to Alan Barrett, Clive D.W. Feather, Andy
4406ba2b2efdSGlen Barber    Heninger, Arthur David Olson, and Alois Treindl, for reporting
4407ba2b2efdSGlen Barber    bugs and elucidating some of the corners of the old floating-point
4408ba2b2efdSGlen Barber    implementation.)
4409ba2b2efdSGlen Barber
4410ba2b2efdSGlen Barber    The signatures of 'offtime', 'timeoff', and 'gtime' have been
4411ba2b2efdSGlen Barber    changed back to the old practice of using 'long' to represent UT
4412ba2b2efdSGlen Barber    offsets.  This had been inadvertently and mistakenly changed to
4413ba2b2efdSGlen Barber    'int_fast32_t'.  (Thanks to Christos Zoulas.)
4414ba2b2efdSGlen Barber
4415ba2b2efdSGlen Barber    The code avoids undefined behavior on integer overflow in some
4416ba2b2efdSGlen Barber    more places, including gmtime, localtime, mktime and zdump.
4417ba2b2efdSGlen Barber
4418ba2b2efdSGlen Barber  Changes affecting the zdump utility
4419ba2b2efdSGlen Barber
4420ba2b2efdSGlen Barber    zdump now outputs "UT" when referring to Universal Time, not "UTC".
4421ba2b2efdSGlen Barber    "UTC" does not make sense for timestamps that predate the introduction
4422259e2ad7SPhilip Paeps    of UTC, whereas "UT", a more generic term, does.  (Thanks to Steve Allen
4423ba2b2efdSGlen Barber    for clarifying UT vs UTC.)
4424ba2b2efdSGlen Barber
4425ba2b2efdSGlen Barber  Data changes affecting behavior of tzselect and similar programs
4426ba2b2efdSGlen Barber
4427259e2ad7SPhilip Paeps    Country code BQ is now called the more common name "Caribbean Netherlands"
4428259e2ad7SPhilip Paeps    rather than the more official "Bonaire, St Eustatius & Saba".
4429ba2b2efdSGlen Barber
4430ba2b2efdSGlen Barber    Remove from zone.tab the names America/Montreal, America/Shiprock,
4431ba2b2efdSGlen Barber    and Antarctica/South_Pole, as they are equivalent to existing
4432ba2b2efdSGlen Barber    same-country-code zones for post-1970 timestamps.  The data entries for
4433ba2b2efdSGlen Barber    these names are unchanged, so the names continue to work as before.
4434ba2b2efdSGlen Barber
4435ba2b2efdSGlen Barber  Changes affecting code internals
4436ba2b2efdSGlen Barber
4437ba2b2efdSGlen Barber    zic -c now runs way faster on 64-bit hosts when given large numbers.
4438ba2b2efdSGlen Barber
4439ba2b2efdSGlen Barber    zic now uses vfprintf to avoid allocating and freeing some memory.
4440ba2b2efdSGlen Barber
4441ba2b2efdSGlen Barber    tzselect now computes the list of continents from the data,
4442ba2b2efdSGlen Barber    rather than have it hard-coded.
4443ba2b2efdSGlen Barber
4444ba2b2efdSGlen Barber    Minor changes pacify GCC 4.7.3 and GCC 4.8.1.
4445ba2b2efdSGlen Barber
4446ba2b2efdSGlen Barber  Changes affecting the build procedure
4447ba2b2efdSGlen Barber
4448ba2b2efdSGlen Barber    The 'leapseconds' file is now generated automatically from a
4449ba2b2efdSGlen Barber    new file 'leap-seconds.list', which is a copy of
44508d7edd17SPhilip Paeps    <ftp://ftp.nist.gov/pub/time/leap-seconds.list>
4451ba2b2efdSGlen Barber    A new source file 'leapseconds.awk' implements this.
4452ba2b2efdSGlen Barber    The goal is simplification of the future maintenance of 'leapseconds'.
4453ba2b2efdSGlen Barber
4454ba2b2efdSGlen Barber    When building the 'posix' or 'right' subdirectories, if the
4455ba2b2efdSGlen Barber    subdirectory would be a copy of the default subdirectory, it is
4456ba2b2efdSGlen Barber    now made a symbolic link if that is supported.  This saves about
4457ba2b2efdSGlen Barber    2 MB of file system space.
4458ba2b2efdSGlen Barber
4459ba2b2efdSGlen Barber    The links America/Shiprock and Antarctica/South_Pole have been
4460ba2b2efdSGlen Barber    moved to the 'backward' file.  This affects only nondefault builds
4461ba2b2efdSGlen Barber    that omit 'backward'.
4462ba2b2efdSGlen Barber
4463ba2b2efdSGlen Barber  Changes affecting version-control only
4464ba2b2efdSGlen Barber
4465ba2b2efdSGlen Barber    .gitignore now ignores 'date'.
4466ba2b2efdSGlen Barber
4467ba2b2efdSGlen Barber  Changes affecting documentation and commentary
4468ba2b2efdSGlen Barber
4469ba2b2efdSGlen Barber    Changes to the 'tzfile' man page
4470ba2b2efdSGlen Barber
4471ba2b2efdSGlen Barber      It now mentions that the binary file format may be extended in
4472ba2b2efdSGlen Barber      future versions by appending data.
4473ba2b2efdSGlen Barber
4474ba2b2efdSGlen Barber      It now refers to the 'zdump' and 'zic' man pages.
4475ba2b2efdSGlen Barber
4476ba2b2efdSGlen Barber    Changes to the 'zic' man page
4477ba2b2efdSGlen Barber
4478ba2b2efdSGlen Barber      It lists conditions that elicit a warning with '-v'.
4479ba2b2efdSGlen Barber
4480ba2b2efdSGlen Barber      It says that the behavior is unspecified when duplicate names
4481ba2b2efdSGlen Barber      are given, or if the source of one link is the target of another.
4482ba2b2efdSGlen Barber
4483ba2b2efdSGlen Barber      Its examples are updated to match the latest data.
4484ba2b2efdSGlen Barber
4485ba2b2efdSGlen Barber      The definition of white space has been clarified slightly.
4486ba2b2efdSGlen Barber      (Thanks to Michael Deckers.)
4487ba2b2efdSGlen Barber
4488ba2b2efdSGlen Barber    Changes to the 'Theory' file
4489ba2b2efdSGlen Barber
4490ba2b2efdSGlen Barber      There is a new section about the accuracy of the tz database,
4491ba2b2efdSGlen Barber      describing the many ways that errors can creep in, and
4492ba2b2efdSGlen Barber      explaining why so many of the pre-1970 timestamps are wrong or
4493ba2b2efdSGlen Barber      misleading (thanks to Steve Allen, Lester Caine, and Garrett
4494ba2b2efdSGlen Barber      Wollman for discussions that contributed to this).
4495ba2b2efdSGlen Barber
4496ba2b2efdSGlen Barber      The 'Theory' file describes LMT better (this follows a
4497ba2b2efdSGlen Barber      suggestion by Guy Harris).
4498ba2b2efdSGlen Barber
4499ba2b2efdSGlen Barber      It refers to the 2013 edition of POSIX rather than the 2004 edition.
4500ba2b2efdSGlen Barber
4501ba2b2efdSGlen Barber      It's mentioned that excluding 'backward' should not affect the
4502ba2b2efdSGlen Barber      other data, and it suggests at least one zone.tab name per
4503ba2b2efdSGlen Barber      inhabited country (thanks to Stephen Colebourne).
4504ba2b2efdSGlen Barber
4505ba2b2efdSGlen Barber      Some longstanding restrictions on names are documented, e.g.,
4506ba2b2efdSGlen Barber      'America/New_York' precludes 'America/New_York/Bronx'.
4507ba2b2efdSGlen Barber
4508ba2b2efdSGlen Barber      It gives more reasons for the 1970 cutoff.
4509ba2b2efdSGlen Barber
4510ba2b2efdSGlen Barber      It now mentions which time_t variants are supported, such as
4511ba2b2efdSGlen Barber      signed integer time_t.  (Thanks to Paul Goyette for reporting
4512ba2b2efdSGlen Barber      typos in an experimental version of this change.)
4513ba2b2efdSGlen Barber
4514ba2b2efdSGlen Barber      (Thanks to Philip Newton for correcting typos in these changes.)
4515ba2b2efdSGlen Barber
4516ba2b2efdSGlen Barber    Documentation and commentary is more careful to distinguish UT in
4517ba2b2efdSGlen Barber    general from UTC in particular.  (Thanks to Steve Allen.)
4518ba2b2efdSGlen Barber
4519ba2b2efdSGlen Barber    Add a better source for the Zurich 1894 transition.
4520ba2b2efdSGlen Barber    (Thanks to Pierre-Yves Berger.)
4521ba2b2efdSGlen Barber
4522ba2b2efdSGlen Barber    Update shapefile citations in tz-link.htm.  (Thanks to Guy Harris.)
4523ba2b2efdSGlen Barber
4524ba2b2efdSGlen Barber
4525ba2b2efdSGlen BarberRelease 2013d - 2013-07-05 07:38:01 -0700
4526ba2b2efdSGlen Barber
4527ba2b2efdSGlen Barber  Changes affecting future timestamps:
4528ba2b2efdSGlen Barber
4529ba2b2efdSGlen Barber    Morocco's midsummer transitions this year are July 7 and August 10,
4530ba2b2efdSGlen Barber    not July 9 and August 8.  (Thanks to Andrew Paprocki.)
4531ba2b2efdSGlen Barber
4532ba2b2efdSGlen Barber    Israel now falls back on the last Sunday of October.
4533ba2b2efdSGlen Barber    (Thanks to Ephraim Silverberg.)
4534ba2b2efdSGlen Barber
4535ba2b2efdSGlen Barber  Changes affecting past timestamps:
4536ba2b2efdSGlen Barber
4537ba2b2efdSGlen Barber    Specify Jerusalem's location more precisely; this changes the pre-1880
4538ba2b2efdSGlen Barber    times by 2 s.
4539ba2b2efdSGlen Barber
4540ba2b2efdSGlen Barber  Changing affecting metadata only:
4541ba2b2efdSGlen Barber
4542ba2b2efdSGlen Barber    Fix typos in the entries for country codes BQ and SX.
4543ba2b2efdSGlen Barber
4544ba2b2efdSGlen Barber  Changes affecting code:
4545ba2b2efdSGlen Barber
4546ba2b2efdSGlen Barber    Rework the code to fix a bug with handling Australia/Macquarie on
4547ba2b2efdSGlen Barber    32-bit hosts (thanks to Arthur David Olson).
4548ba2b2efdSGlen Barber
4549ba2b2efdSGlen Barber    Port to platforms like NetBSD, where time_t can be wider than long.
4550ba2b2efdSGlen Barber
4551ba2b2efdSGlen Barber    Add support for testing time_t types other than the system's.
4552ba2b2efdSGlen Barber    Run 'make check_time_t_alternatives' to try this out.
4553ba2b2efdSGlen Barber    Currently, the tests fail for unsigned time_t;
4554ba2b2efdSGlen Barber    this should get fixed at some point.
4555ba2b2efdSGlen Barber
4556ba2b2efdSGlen Barber  Changes affecting documentation and commentary:
4557ba2b2efdSGlen Barber
4558ba2b2efdSGlen Barber    Deemphasize the significance of national borders.
4559ba2b2efdSGlen Barber
4560ba2b2efdSGlen Barber    Update the zdump man page.
4561ba2b2efdSGlen Barber
4562ba2b2efdSGlen Barber    Remove obsolete NOID comment (thanks to Denis Excoffier).
4563ba2b2efdSGlen Barber
4564ba2b2efdSGlen Barber    Update several URLs and comments in the web pages.
4565ba2b2efdSGlen Barber
4566ba2b2efdSGlen Barber    Spelling fixes (thanks to Kevin Lyda and Jonathan Leffler).
4567ba2b2efdSGlen Barber
4568ba2b2efdSGlen Barber    Update URL for CLDR Zone->Tzid table (thanks to Yoshito Umaoka).
4569ba2b2efdSGlen Barber
4570ba2b2efdSGlen Barber
4571ba2b2efdSGlen BarberRelease 2013c - 2013-04-19 16:17:40 -0700
4572ba2b2efdSGlen Barber
4573ba2b2efdSGlen Barber  Changes affecting current and future timestamps:
4574ba2b2efdSGlen Barber
4575ba2b2efdSGlen Barber    Palestine observed DST starting March 29, 2013.  (Thanks to
4576ba2b2efdSGlen Barber    Steffen Thorsen.)  From 2013 on, Gaza and Hebron both observe DST,
4577ba2b2efdSGlen Barber    with the predicted rules being the last Thursday in March at 24:00
4578ba2b2efdSGlen Barber    to the first Friday on or after September 21 at 01:00.
4579ba2b2efdSGlen Barber
4580ba2b2efdSGlen Barber    Assume that the recent change to Paraguay's DST rules is permanent,
4581ba2b2efdSGlen Barber    by moving the end of DST to the 4th Sunday in March every year.
4582ba2b2efdSGlen Barber    (Thanks to Carlos Raúl Perasso.)
4583ba2b2efdSGlen Barber
4584ba2b2efdSGlen Barber  Changes affecting past timestamps:
4585ba2b2efdSGlen Barber
4586ba2b2efdSGlen Barber    Fix some historical data for Palestine to agree with that of
4587ba2b2efdSGlen Barber    timeanddate.com, as follows:
4588ba2b2efdSGlen Barber
4589ba2b2efdSGlen Barber	  The spring 2008 change in Gaza and Hebron was on 00:00 Mar 28, not
4590ba2b2efdSGlen Barber	  00:00 Apr 1.
4591ba2b2efdSGlen Barber
4592ba2b2efdSGlen Barber	  The fall 2009 change in Gaza and Hebron on Sep 4 was at 01:00, not
4593ba2b2efdSGlen Barber	  02:00.
4594ba2b2efdSGlen Barber
4595ba2b2efdSGlen Barber	  The spring 2010 change in Hebron was 00:00 Mar 26, not 00:01 Mar 27.
4596ba2b2efdSGlen Barber
4597ba2b2efdSGlen Barber	  The spring 2011 change in Gaza was 00:01 Apr 1, not 12:01 Apr 2.
4598ba2b2efdSGlen Barber
4599ba2b2efdSGlen Barber	  The spring 2011 change in Hebron on Apr 1 was at 00:01, not 12:01.
4600ba2b2efdSGlen Barber
4601ba2b2efdSGlen Barber	  The fall 2011 change in Hebron on Sep 30 was at 00:00, not 03:00.
4602ba2b2efdSGlen Barber
4603ba2b2efdSGlen Barber    Fix times of habitation for Macquarie to agree with the Tasmania
4604ba2b2efdSGlen Barber    Parks & Wildlife Service history, which indicates that permanent
4605ba2b2efdSGlen Barber    habitation was 1899-1919 and 1948 on.
4606ba2b2efdSGlen Barber
4607ba2b2efdSGlen Barber  Changing affecting metadata only:
4608ba2b2efdSGlen Barber
4609ba2b2efdSGlen Barber    Macquarie Island is politically part of Australia, not Antarctica.
4610ba2b2efdSGlen Barber    (Thanks to Tobias Conradi.)
4611ba2b2efdSGlen Barber
4612259e2ad7SPhilip Paeps    Sort Macquarie more consistently with other parts of Australia.
4613ba2b2efdSGlen Barber    (Thanks to Tim Parenti.)
4614ba2b2efdSGlen Barber
4615ba2b2efdSGlen Barber
4616ba2b2efdSGlen BarberRelease 2013b - 2013-03-10 22:33:40 -0700
4617ba2b2efdSGlen Barber
4618ba2b2efdSGlen Barber  Changes affecting current and future timestamps:
4619ba2b2efdSGlen Barber
4620ba2b2efdSGlen Barber    Haiti uses US daylight-saving rules this year, and presumably future years.
4621ba2b2efdSGlen Barber    This changes timestamps starting today.  (Thanks to Steffen Thorsen.)
4622ba2b2efdSGlen Barber
4623ba2b2efdSGlen Barber    Paraguay will end DST on March 24 this year.
4624ba2b2efdSGlen Barber    (Thanks to Steffen Thorsen.)  For now, assume it's just this year.
4625ba2b2efdSGlen Barber
4626ba2b2efdSGlen Barber    Morocco does not observe DST during Ramadan;
4627ba2b2efdSGlen Barber    try to predict Ramadan in Morocco as best we can.
4628ba2b2efdSGlen Barber    (Thanks to Erik Homoet for the heads-up.)
4629ba2b2efdSGlen Barber
4630ba2b2efdSGlen Barber  Changes affecting commentary:
4631ba2b2efdSGlen Barber
4632ba2b2efdSGlen Barber    Update URLs in tz-link page.  Add URLs for webOS, BB10, iOS.
4633ba2b2efdSGlen Barber    Update URL for Solaris.  Mention Internet RFC 6557.
4634ba2b2efdSGlen Barber    Update Internet RFCs 2445->5545, 2822->5322.
4635ba2b2efdSGlen Barber    Switch from FTP to HTTP for Internet RFCs.
4636ba2b2efdSGlen Barber
4637ba2b2efdSGlen Barber
4638ba2b2efdSGlen BarberRelease 2013a - 2013-02-27 09:20:35 -0800
4639ba2b2efdSGlen Barber
4640ba2b2efdSGlen Barber  Change affecting binary data format:
4641ba2b2efdSGlen Barber
4642ba2b2efdSGlen Barber    The zone offset at the end of version-2-format zone files is now
4643ba2b2efdSGlen Barber    allowed to be 24:00, as per POSIX.1-2008.  (Thanks to Arthur David Olson.)
4644ba2b2efdSGlen Barber
4645ba2b2efdSGlen Barber  Changes affecting current and future timestamps:
4646ba2b2efdSGlen Barber
4647ba2b2efdSGlen Barber    Chile's 2013 rules, and we guess rules for 2014 and later, will be
4648ba2b2efdSGlen Barber    the same as 2012, namely Apr Sun>=23 03:00 UTC to Sep Sun>=2 04:00 UTC.
4649ba2b2efdSGlen Barber    (Thanks to Steffen Thorsen and Robert Elz.)
4650ba2b2efdSGlen Barber
4651ba2b2efdSGlen Barber    New Zones Asia/Khandyga, Asia/Ust-Nera, Europe/Busingen.
4652ba2b2efdSGlen Barber    (Thanks to Tobias Conradi and Arthur David Olson.)
4653ba2b2efdSGlen Barber
4654ba2b2efdSGlen Barber  Many changes affect historical timestamps before 1940.
4655ba2b2efdSGlen Barber  These were deduced from: Milne J. Civil time. Geogr J. 1899
46568d7edd17SPhilip Paeps  Feb;13(2):173-94 <https://www.jstor.org/stable/1774359>.
4657ba2b2efdSGlen Barber
4658ba2b2efdSGlen Barber  Changes affecting the code:
4659ba2b2efdSGlen Barber
4660ba2b2efdSGlen Barber    Fix zic bug that mishandled Egypt's 2010 changes (this also affected
4661ba2b2efdSGlen Barber    the data).  (Thanks to Arthur David Olson.)
4662ba2b2efdSGlen Barber
4663ba2b2efdSGlen Barber    Fix localtime bug when time_t is unsigned and data files were generated
4664ba2b2efdSGlen Barber    by a signed time_t system.  (Thanks to Doug Bailey for reporting and
4665ba2b2efdSGlen Barber    to Arthur David Olson for fixing.)
4666ba2b2efdSGlen Barber
4667ba2b2efdSGlen Barber    Allow the email address for bug reports to be set by the packager.
4668ba2b2efdSGlen Barber    The default is tz@iana.org, as before.  (Thanks to Joseph S. Myers.)
4669ba2b2efdSGlen Barber
4670ba2b2efdSGlen Barber    Update HTML checking to be compatible with Ubuntu 12.10.
4671ba2b2efdSGlen Barber
4672ba2b2efdSGlen Barber    Check that files are a safe subset of ASCII.  At some point we may
4673ba2b2efdSGlen Barber    relax this requirement to a safe subset of UTF-8.  Without the
4674ba2b2efdSGlen Barber    check, some non-UTF-8 encodings were leaking into the distribution.
4675ba2b2efdSGlen Barber
4676ba2b2efdSGlen Barber  Commentary changes:
4677ba2b2efdSGlen Barber
4678ba2b2efdSGlen Barber    Restore a comment about copyright notices that was inadvertently deleted.
4679ba2b2efdSGlen Barber    (Thanks to Arthur David Olson.)
4680ba2b2efdSGlen Barber
4681ba2b2efdSGlen Barber    Improve the commentary about which districts observe what times
46822865ab3fSPhilip Paeps    in Russia.  (Thanks to Oscar van Vlijmen and Arthur David Olson.)
4683ba2b2efdSGlen Barber
4684ba2b2efdSGlen Barber    Add web page links to tz.js.
4685ba2b2efdSGlen Barber
4686ba2b2efdSGlen Barber    Add "Run by the Monkeys" to tz-art.  (Thanks to Arthur David Olson.)
4687ba2b2efdSGlen Barber
4688ba2b2efdSGlen Barber
4689ba2b2efdSGlen BarberRelease 2012j - 2012-11-12 18:34:49 -0800
4690ba2b2efdSGlen Barber
4691ba2b2efdSGlen Barber  Libya moved to CET this weekend, but with DST planned next year.
4692ba2b2efdSGlen Barber  (Thanks to Even Scharning, Steffen Thorsen, and Tim Parenti.)
4693ba2b2efdSGlen Barber
4694ba2b2efdSGlen Barber  Signatures now have the extension .asc, not .sign, as that's more
4695ba2b2efdSGlen Barber  standard.  (Thanks to Phil Pennock.)
4696ba2b2efdSGlen Barber
4697ba2b2efdSGlen Barber  The output of 'zdump --version', and of 'zic --version', now
4698ba2b2efdSGlen Barber  uses a format that is more typical for --version.
4699ba2b2efdSGlen Barber  (Thanks to Joseph S. Myers.)
4700ba2b2efdSGlen Barber
4701ba2b2efdSGlen Barber  The output of 'tzselect --help', 'zdump --help', and 'zic --help'
4702ba2b2efdSGlen Barber  now uses tz@iana.org rather than the old elsie address.
4703ba2b2efdSGlen Barber
4704ba2b2efdSGlen Barber  zic -v now complains about abbreviations that are less than 3
4705eebb9c2cSPhilip Paeps  or more than 6 characters, as per POSIX.  Formerly, it checked
4706ba2b2efdSGlen Barber  for abbreviations that were more than 3.
4707ba2b2efdSGlen Barber
4708ba2b2efdSGlen Barber  'make public' no longer puts its temporary directory under /tmp,
4709ba2b2efdSGlen Barber  and uses the just-built zic rather than the system zic.
4710ba2b2efdSGlen Barber
4711ba2b2efdSGlen Barber  Various fixes to documentation and commentary.
4712ba2b2efdSGlen Barber
4713ba2b2efdSGlen Barber
4714ba2b2efdSGlen BarberRelease 2012i - 2012-11-03 12:57:09 -0700
4715ba2b2efdSGlen Barber
4716ba2b2efdSGlen Barber  Cuba switches from DST tomorrow at 01:00.  (Thanks to Steffen Thorsen.)
4717ba2b2efdSGlen Barber
4718ba2b2efdSGlen Barber  Linker flags can now be specified via LDFLAGS.
4719ba2b2efdSGlen Barber  AWK now defaults to 'awk', not 'nawk'.
4720ba2b2efdSGlen Barber  The shell in tzselect now defaults to /bin/bash, but this can
4721ba2b2efdSGlen Barber  be overridden by specifying KSHELL.
4722ba2b2efdSGlen Barber  The main web page now mentions the unofficial GitHub repository.
4723ba2b2efdSGlen Barber  (Thanks to Mike Frysinger.)
4724ba2b2efdSGlen Barber
4725ba2b2efdSGlen Barber  Tarball signatures can now be built by running 'make signatures'.
4726ba2b2efdSGlen Barber  There are also new makefile rules 'tarballs', 'check_public', and
4727ba2b2efdSGlen Barber  separate makefile rules for each tarball and signature file.
4728ba2b2efdSGlen Barber  A few makefile rules are now more portable to strict POSIX.
4729ba2b2efdSGlen Barber
4730ba2b2efdSGlen Barber  The main web page now lists the canonical IANA URL.
4731ba2b2efdSGlen Barber
4732ba2b2efdSGlen Barber
4733ba2b2efdSGlen BarberRelease 2012h - 2012-10-26 22:49:10 -0700
4734ba2b2efdSGlen Barber
4735ba2b2efdSGlen Barber  Bahia no longer has DST.  (Thanks to Kelley Cook.)
4736ba2b2efdSGlen Barber
4737ba2b2efdSGlen Barber  Tocantins has DST.  (Thanks to Rodrigo Severo.)
4738ba2b2efdSGlen Barber
4739ba2b2efdSGlen Barber  Israel has new DST rules next year.  (Thanks to Ephraim Silverberg.)
4740ba2b2efdSGlen Barber
4741ba2b2efdSGlen Barber  Jordan stays on DST this winter.  (Thanks to Steffen Thorsen.)
4742ba2b2efdSGlen Barber
4743ba2b2efdSGlen Barber  Web page updates.
4744ba2b2efdSGlen Barber
4745ba2b2efdSGlen Barber  More C modernization, except that at Arthur David Olson's suggestion
4746ba2b2efdSGlen Barber  the instances of 'register' were kept.
4747ba2b2efdSGlen Barber
4748ba2b2efdSGlen Barber
4749ba2b2efdSGlen BarberRelease 2012g - 2012-10-17 20:59:45 -0700
4750ba2b2efdSGlen Barber
4751ba2b2efdSGlen Barber  Samoa fall 2012 and later.  (Thanks to Nicholas Pereira and Robert Elz.)
4752ba2b2efdSGlen Barber
4753ba2b2efdSGlen Barber  Palestine fall 2012.  (Thanks to Steffen Thorsen.)
4754ba2b2efdSGlen Barber
4755ba2b2efdSGlen Barber  Assume C89.
4756ba2b2efdSGlen Barber
4757ba2b2efdSGlen Barber  To attack the version-number problem, this release ships the file
4758ba2b2efdSGlen Barber  'Makefile' (which contains the release number) in both the tzcode and
4759ba2b2efdSGlen Barber  the tzdata tarballs.  The two Makefiles are identical, and should be
4760ba2b2efdSGlen Barber  identical in any matching pair of tarballs, so it shouldn't matter
4761ba2b2efdSGlen Barber  which order you extract the tarballs.  Perhaps we can come up with a
4762ba2b2efdSGlen Barber  better version-number scheme at some point; this scheme does have the
4763ba2b2efdSGlen Barber  virtue of not adding more files.
4764ba2b2efdSGlen Barber
4765ba2b2efdSGlen Barber
4766ba2b2efdSGlen BarberRelease 2012f - 2012-09-12 23:17:03 -0700
4767ba2b2efdSGlen Barber
4768ba2b2efdSGlen Barber  * australasia (Pacific/Fiji): Fiji DST is October 21 through January
4769ba2b2efdSGlen Barber    20 this year.  (Thanks to Steffen Thorsen.)
4770ba2b2efdSGlen Barber
4771ba2b2efdSGlen Barber
4772ba2b2efdSGlen BarberRelease 2012e - 2012-08-02 20:44:55 -0700
4773ba2b2efdSGlen Barber
4774ba2b2efdSGlen Barber  * australasia (Pacific/Fakaofo): Tokelau is UT +13, not +14.
4775ba2b2efdSGlen Barber    (Thanks to Steffen Thorsen.)
4776ba2b2efdSGlen Barber
4777ba2b2efdSGlen Barber  * Use a single version number for both code and data.
4778ba2b2efdSGlen Barber
4779ba2b2efdSGlen Barber  * .gitignore: New file.
4780ba2b2efdSGlen Barber
4781ba2b2efdSGlen Barber  * Remove trailing white space.
4782ba2b2efdSGlen Barber
4783ba2b2efdSGlen Barber
4784ba2b2efdSGlen BarberRelease code2012c-data2012d - 2012-07-19 16:35:33 -0700
4785ba2b2efdSGlen Barber
4786ba2b2efdSGlen Barber  Changes for Morocco's timestamps, which take effect in a couple of
4787ba2b2efdSGlen Barber  hours, along with infrastructure changes to accommodate how the tz
4788ba2b2efdSGlen Barber  code and data are released on IANA.
4789ba2b2efdSGlen Barber
4790ba2b2efdSGlen Barber
4791ba2b2efdSGlen BarberRelease data2012c - 2012-03-27 12:17:25 -0400
4792ba2b2efdSGlen Barber
4793ba2b2efdSGlen Barber  africa
4794ba2b2efdSGlen Barber	Summer time changes for Morocco (to start late April 2012)
4795ba2b2efdSGlen Barber
4796ba2b2efdSGlen Barber  asia
4797ba2b2efdSGlen Barber	Changes for 2012 for Gaza & the West Bank (Hebron) and Syria
4798ba2b2efdSGlen Barber
4799ba2b2efdSGlen Barber  northamerica
4800ba2b2efdSGlen Barber	Haiti following US/Canada rules for 2012 (and we're assuming,
4801ba2b2efdSGlen Barber	for now anyway, for the future).
4802ba2b2efdSGlen Barber
4803ba2b2efdSGlen Barber
4804ba2b2efdSGlen BarberRelease 2012b - 2012-03-02 12:29:15 +0700
4805ba2b2efdSGlen Barber
4806ba2b2efdSGlen Barber  There is just one change to tzcode2012b (compared with 2012a):
4807ba2b2efdSGlen Barber  the Makefile that was accidentally included with 2012a has been
4808ba2b2efdSGlen Barber  replaced with the version that should have been there, which is
4809ba2b2efdSGlen Barber  identical with the previous version (from tzcode2011i).
4810ba2b2efdSGlen Barber
4811ba2b2efdSGlen Barber  There are just two changes in tzdata2012b compared with 2012a.
4812ba2b2efdSGlen Barber
4813ba2b2efdSGlen Barber  Most significantly, summer time in Cuba has been delayed 3 weeks
4814ba2b2efdSGlen Barber  (now starts April 1 rather than March 11).   Since Mar 11 (the old start
4815ba2b2efdSGlen Barber  date, as listed in 2012a) is just a little over a week away, this
4816ba2b2efdSGlen Barber  change is urgent.
4817ba2b2efdSGlen Barber
4818ba2b2efdSGlen Barber  Less importantly, an excess tab in one of the changes in zone.tab
4819ba2b2efdSGlen Barber  in 2012a has been removed.
4820ba2b2efdSGlen Barber
4821ba2b2efdSGlen Barber
4822ba2b2efdSGlen BarberRelease 2012a - 2012-03-01 18:28:10 +0700
4823ba2b2efdSGlen Barber
4824ba2b2efdSGlen Barber  The changes in tzcode2012a (compared to the previous version, 2011i)
4825ba2b2efdSGlen Barber  are entirely to the README and tz-art.htm and tz-link.htm files, if
4826ba2b2efdSGlen Barber  none of those concern you, you can ignore the code update.  The changes
4827ba2b2efdSGlen Barber  reflect the changed addresses for the mailing list and the code and
4828ba2b2efdSGlen Barber  data distribution points & methods (and a link to DateTime::TimeZone::Tzfile
4829ba2b2efdSGlen Barber  has been added to tz-link.htm).
4830ba2b2efdSGlen Barber
4831ba2b2efdSGlen Barber  In tzdata2012a (compared to the previous release, which was 2011n)
4832ba2b2efdSGlen Barber  the major changes are:
4833ba2b2efdSGlen Barber	Chile 2011/2012 and 2012/2013 summer time date adjustments.
4834ba2b2efdSGlen Barber	Falkland Islands onto permanent summer time (we're assuming for the
4835ba2b2efdSGlen Barber		foreseeable future, though 2012 is all we're fairly certain of.)
4836ba2b2efdSGlen Barber	Armenia has abolished Summer Time.
4837ba2b2efdSGlen Barber	Tokelau jumped the International Date Line back last December
4838ba2b2efdSGlen Barber		(just the same as their near neighbour, Samoa).
4839ba2b2efdSGlen Barber	America/Creston is a new zone for a small area of British Columbia
4840ba2b2efdSGlen Barber	There will be a leapsecond 2012-06-30 23:59:60 UTC.
4841ba2b2efdSGlen Barber
4842ba2b2efdSGlen Barber  Other minor changes are:
4843ba2b2efdSGlen Barber	Corrections to 1918 Canadian summer time end dates.
4844ba2b2efdSGlen Barber	Updated URL for UK time zone history (in comments)
4845ba2b2efdSGlen Barber	A few typos in Le Corre's list of free French place names (comments)
4846ba2b2efdSGlen Barber
4847ba2b2efdSGlen Barber
4848ba2b2efdSGlen BarberRelease data2011n - 2011-10-30 14:57:54 +0700
4849ba2b2efdSGlen Barber
4850ba2b2efdSGlen Barber  There are three changes of note - most urgently, Cuba (America/Havana)
4851ba2b2efdSGlen Barber  has extended summer time by two weeks, now to end on Nov 13, rather than
4852ba2b2efdSGlen Barber  the (already past) Oct 30.   Second, the Pridnestrovian Moldavian Republic
4853ba2b2efdSGlen Barber  (Europe/Tiraspol) decided not to split from the rest of Moldova after
4854ba2b2efdSGlen Barber  all, and consequently that zone has been removed (again) and reinstated
4855ba2b2efdSGlen Barber  in the "backward" file as a link to Europe/Chisinau.   And third, the
4856ba2b2efdSGlen Barber  end date for Fiji's summer time this summer was moved forward from the
4857ba2b2efdSGlen Barber  earlier planned Feb 26, to Jan 22.
4858ba2b2efdSGlen Barber
4859ba2b2efdSGlen Barber  Apart from that, Moldova (MD) returns to a single entry in zone.tab
4860ba2b2efdSGlen Barber  (and the incorrect syntax that was in the 2011m version of that file
4861ba2b2efdSGlen Barber  is so fixed - it would have been fixed in a different way had this
4862ba2b2efdSGlen Barber  change not happened - that's the "missing" sccs version id).
4863ba2b2efdSGlen Barber
4864ba2b2efdSGlen Barber
4865ba2b2efdSGlen BarberRelease data2011m - 2011-10-24 21:42:16 +0700
4866ba2b2efdSGlen Barber
4867ba2b2efdSGlen Barber  In particular, the typos in comments in the data (2011-11-17 should have
4868ba2b2efdSGlen Barber  been 2011-10-17 as Alan Barrett noted, and spelling of Tiraspol that
4869ba2b2efdSGlen Barber  Tim Parenti noted) have been fixed, and the change for Ukraine has been
4870eebb9c2cSPhilip Paeps  made in all 4 Ukrainian zones, rather than just Europe/Kiev
4871eebb9c2cSPhilip Paeps  (again, thanks to Tim Parenti, and also Denys Gavrysh).
4872ba2b2efdSGlen Barber
4873ba2b2efdSGlen Barber  In addition, I added Europe/Tiraspol to zone.tab.
4874ba2b2efdSGlen Barber
4875ba2b2efdSGlen Barber  This time, all the files have new version numbers...  (including the files
4876ba2b2efdSGlen Barber  otherwise unchanged in 2011m that were changed in 2011l but didn't get new
4877ba2b2efdSGlen Barber  version numbers there...)
4878ba2b2efdSGlen Barber
4879ba2b2efdSGlen Barber
4880ba2b2efdSGlen BarberRelease data2011l - 2011-10-10 11:15:43 +0700
4881ba2b2efdSGlen Barber
4882ba2b2efdSGlen Barber  There are just 2 changes that cause different generated tzdata files from
4883ba2b2efdSGlen Barber  zic, to Asia/Hebron and Pacific/Fiji - the possible change for Bahia, Brazil
4884ba2b2efdSGlen Barber  is included, but commented out.  Compared with the diff I sent out last week,
4885ba2b2efdSGlen Barber  this version also includes attributions for the sources for the changes
4886ba2b2efdSGlen Barber  (in much the same format as ado used, but the html tags have not been
4887ba2b2efdSGlen Barber  checked, verified, or used in any way at all, so if there are errors there,
4888ba2b2efdSGlen Barber  please let me know.)
4889ba2b2efdSGlen Barber
4890ba2b2efdSGlen Barber
4891ba2b2efdSGlen BarberRelease data2011k - 2011-09-20 17:54:03 -0400
4892ba2b2efdSGlen Barber
4893ba2b2efdSGlen Barber  [not summarized]
4894ba2b2efdSGlen Barber
4895ba2b2efdSGlen Barber
4896ba2b2efdSGlen BarberRelease data2011j - 2011-09-12 09:22:49 -0400
4897ba2b2efdSGlen Barber
4898ba2b2efdSGlen Barber  (contemporary changes for Samoa; past changes for Kenya, Uganda, and
4899ba2b2efdSGlen Barber  Tanzania); there are also two spelling corrections to comments in
4900ba2b2efdSGlen Barber  the australasia file (with thanks to Christos Zoulas).
4901ba2b2efdSGlen Barber
4902ba2b2efdSGlen Barber
4903ba2b2efdSGlen BarberRelease 2011i - 2011-08-29 05:56:32 -0400
4904ba2b2efdSGlen Barber
4905ba2b2efdSGlen Barber  [not summarized]
4906ba2b2efdSGlen Barber
4907ba2b2efdSGlen Barber
4908ba2b2efdSGlen BarberRelease data2011h - 2011-06-15 18:41:48 -0400
4909ba2b2efdSGlen Barber
4910ba2b2efdSGlen Barber  Russia and Curaçao changes
4911ba2b2efdSGlen Barber
4912ba2b2efdSGlen Barber
4913ba2b2efdSGlen BarberRelease 2011g - 2011-04-25 09:07:22 -0400
4914ba2b2efdSGlen Barber
4915ba2b2efdSGlen Barber  update the rules for Egypt to reflect its abandonment of DST this year
4916ba2b2efdSGlen Barber
4917ba2b2efdSGlen Barber
4918ba2b2efdSGlen BarberRelease 2011f - 2011-04-06 17:14:53 -0400
4919ba2b2efdSGlen Barber
4920ba2b2efdSGlen Barber  [not summarized]
4921ba2b2efdSGlen Barber
4922ba2b2efdSGlen Barber
4923ba2b2efdSGlen BarberRelease 2011e - 2011-03-31 16:04:38 -0400
4924ba2b2efdSGlen Barber
4925ba2b2efdSGlen Barber  Morocco, Chile, and tz-link changes
4926ba2b2efdSGlen Barber
4927ba2b2efdSGlen Barber
4928ba2b2efdSGlen BarberRelease 2011d - 2011-03-14 09:18:01 -0400
4929ba2b2efdSGlen Barber
4930ba2b2efdSGlen Barber  changes that impact present-day timestamps in Cuba, Samoa, and Turkey
4931ba2b2efdSGlen Barber
4932ba2b2efdSGlen Barber
4933ba2b2efdSGlen BarberRelease 2011c - 2011-03-07 09:30:09 -0500
4934ba2b2efdSGlen Barber
4935ba2b2efdSGlen Barber  These do affect current timestamps in Chile and Annette Island, Canada.
4936ba2b2efdSGlen Barber
4937ba2b2efdSGlen Barber
4938ba2b2efdSGlen BarberRelease 2011b - 2011-02-07 08:44:50 -0500
4939ba2b2efdSGlen Barber
4940ba2b2efdSGlen Barber  [not summarized]
4941ba2b2efdSGlen Barber
4942ba2b2efdSGlen Barber
4943ba2b2efdSGlen BarberRelease 2011a - 2011-01-24 10:30:16 -0500
4944ba2b2efdSGlen Barber
4945ba2b2efdSGlen Barber  [not summarized]
4946ba2b2efdSGlen Barber
4947ba2b2efdSGlen Barber
4948ba2b2efdSGlen BarberRelease data2010o - 2010-11-01 09:18:23 -0400
4949ba2b2efdSGlen Barber
4950ba2b2efdSGlen Barber  change to the end of DST in Fiji in 2011
4951ba2b2efdSGlen Barber
4952ba2b2efdSGlen Barber
4953ba2b2efdSGlen BarberRelease 2010n - 2010-10-25 08:19:17 -0400
4954ba2b2efdSGlen Barber
4955ba2b2efdSGlen Barber  [not summarized]
4956ba2b2efdSGlen Barber
4957ba2b2efdSGlen Barber
4958ba2b2efdSGlen BarberRelease 2010m - 2010-09-27 09:24:48 -0400
4959ba2b2efdSGlen Barber
4960ba2b2efdSGlen Barber  Hong Kong, Vostok, and zic.c changes
4961ba2b2efdSGlen Barber
4962ba2b2efdSGlen Barber
4963ba2b2efdSGlen BarberRelease 2010l - 2010-08-16 06:57:25 -0400
4964ba2b2efdSGlen Barber
4965ba2b2efdSGlen Barber  [not summarized]
4966ba2b2efdSGlen Barber
4967ba2b2efdSGlen Barber
4968ba2b2efdSGlen BarberRelease 2010k - 2010-07-26 10:42:27 -0400
4969ba2b2efdSGlen Barber
4970ba2b2efdSGlen Barber  [not summarized]
4971ba2b2efdSGlen Barber
4972ba2b2efdSGlen Barber
4973ba2b2efdSGlen BarberRelease 2010j - 2010-05-10 09:07:48 -0400
4974ba2b2efdSGlen Barber
4975ba2b2efdSGlen Barber  changes for Bahía de Banderas and for version naming
4976ba2b2efdSGlen Barber
4977ba2b2efdSGlen Barber
4978ba2b2efdSGlen BarberRelease data2010i - 2010-04-16 18:50:45 -0400
4979ba2b2efdSGlen Barber
4980ba2b2efdSGlen Barber  the end of DST in Morocco on 2010-08-08
4981ba2b2efdSGlen Barber
4982ba2b2efdSGlen Barber
4983ba2b2efdSGlen BarberRelease data2010h - 2010-04-05 09:58:56 -0400
4984ba2b2efdSGlen Barber
4985ba2b2efdSGlen Barber  [not summarized]
4986ba2b2efdSGlen Barber
4987ba2b2efdSGlen Barber
4988ba2b2efdSGlen BarberRelease data2010g - 2010-03-24 11:14:53 -0400
4989ba2b2efdSGlen Barber
4990ba2b2efdSGlen Barber  [not summarized]
4991ba2b2efdSGlen Barber
4992ba2b2efdSGlen Barber
4993ba2b2efdSGlen BarberRelease 2010f - 2010-03-22 09:45:46 -0400
4994ba2b2efdSGlen Barber
4995ba2b2efdSGlen Barber  [not summarized]
4996ba2b2efdSGlen Barber
4997ba2b2efdSGlen Barber
4998ba2b2efdSGlen BarberRelease data2010e - 2010-03-08 14:24:27 -0500
4999ba2b2efdSGlen Barber
5000ba2b2efdSGlen Barber  corrects the Dhaka bug found by Danvin Ruangchan
5001ba2b2efdSGlen Barber
5002ba2b2efdSGlen Barber
5003ba2b2efdSGlen BarberRelease data2010d - 2010-03-06 07:26:01 -0500
5004ba2b2efdSGlen Barber
5005ba2b2efdSGlen Barber  [not summarized]
5006ba2b2efdSGlen Barber
5007ba2b2efdSGlen Barber
5008ba2b2efdSGlen BarberRelease 2010c - 2010-03-01 09:20:58 -0500
5009ba2b2efdSGlen Barber
5010ba2b2efdSGlen Barber  changes including KRE's suggestion for earlier initialization of
5011ba2b2efdSGlen Barber  "goahead" and "goback" structure elements
5012ba2b2efdSGlen Barber
5013ba2b2efdSGlen Barber
5014ba2b2efdSGlen BarberRelease code2010a - 2010-02-16 10:40:04 -0500
5015ba2b2efdSGlen Barber
5016ba2b2efdSGlen Barber  [not summarized]
5017ba2b2efdSGlen Barber
5018ba2b2efdSGlen Barber
5019ba2b2efdSGlen BarberRelease data2010b - 2010-01-20 12:37:01 -0500
5020ba2b2efdSGlen Barber
5021ba2b2efdSGlen Barber  Mexico changes
5022ba2b2efdSGlen Barber
5023ba2b2efdSGlen Barber
5024ba2b2efdSGlen BarberRelease data2010a - 2010-01-18 08:30:04 -0500
5025ba2b2efdSGlen Barber
5026ba2b2efdSGlen Barber  changes to Dhaka
5027ba2b2efdSGlen Barber
5028ba2b2efdSGlen Barber
5029ba2b2efdSGlen BarberRelease data2009u - 2009-12-26 08:32:28 -0500
5030ba2b2efdSGlen Barber
5031ba2b2efdSGlen Barber  changes to DST in Bangladesh
5032ba2b2efdSGlen Barber
5033ba2b2efdSGlen Barber
5034ba2b2efdSGlen BarberRelease 2009t - 2009-12-21 13:24:27 -0500
5035ba2b2efdSGlen Barber
5036ba2b2efdSGlen Barber  [not summarized]
5037ba2b2efdSGlen Barber
5038ba2b2efdSGlen Barber
5039ba2b2efdSGlen BarberRelease data2009s - 2009-11-14 10:26:32 -0500
5040ba2b2efdSGlen Barber
5041ba2b2efdSGlen Barber  (cosmetic) Antarctica change and the DST-in-Fiji-in-2009-and-2010 change
5042ba2b2efdSGlen Barber
5043ba2b2efdSGlen Barber
5044ba2b2efdSGlen BarberRelease 2009r - 2009-11-09 10:10:31 -0500
5045ba2b2efdSGlen Barber
5046ba2b2efdSGlen Barber  "antarctica" and "tz-link.htm" changes
5047ba2b2efdSGlen Barber
5048ba2b2efdSGlen Barber
5049ba2b2efdSGlen BarberRelease 2009q - 2009-11-02 09:12:40 -0500
5050ba2b2efdSGlen Barber
5051ba2b2efdSGlen Barber  with two corrections as reported by Eric Muller and Philip Newton
5052ba2b2efdSGlen Barber
5053ba2b2efdSGlen Barber
5054ba2b2efdSGlen BarberRelease data2009p - 2009-10-23 15:05:27 -0400
5055ba2b2efdSGlen Barber
5056ba2b2efdSGlen Barber  Argentina (including San Luis) changes (with the correction from
5057ba2b2efdSGlen Barber  Mariano Absatz)
5058ba2b2efdSGlen Barber
5059ba2b2efdSGlen Barber
5060ba2b2efdSGlen BarberRelease data2009o - 2009-10-14 16:49:38 -0400
5061ba2b2efdSGlen Barber
5062ba2b2efdSGlen Barber  Samoa (commentary only), Pakistan, and Bangladesh changes
5063ba2b2efdSGlen Barber
5064ba2b2efdSGlen Barber
5065ba2b2efdSGlen BarberRelease data2009n - 2009-09-22 15:13:38 -0400
5066ba2b2efdSGlen Barber
5067ba2b2efdSGlen Barber  added commentary for Argentina and a change to the end of DST in
5068ba2b2efdSGlen Barber  2009 in Pakistan
5069ba2b2efdSGlen Barber
5070ba2b2efdSGlen Barber
5071ba2b2efdSGlen BarberRelease data2009m - 2009-09-03 10:23:43 -0400
5072ba2b2efdSGlen Barber
5073ba2b2efdSGlen Barber  Samoa and Palestine changes
5074ba2b2efdSGlen Barber
5075ba2b2efdSGlen Barber
5076ba2b2efdSGlen BarberRelease data2009l - 2009-08-14 09:13:07 -0400
5077ba2b2efdSGlen Barber
5078ba2b2efdSGlen Barber  Samoa (comments only) and Egypt
5079ba2b2efdSGlen Barber
5080ba2b2efdSGlen Barber
5081ba2b2efdSGlen BarberRelease 2009k - 2009-07-20 09:46:08 -0400
5082ba2b2efdSGlen Barber
5083ba2b2efdSGlen Barber  [not summarized]
5084ba2b2efdSGlen Barber
5085ba2b2efdSGlen Barber
5086ba2b2efdSGlen BarberRelease data2009j - 2009-06-15 06:43:59 -0400
5087ba2b2efdSGlen Barber
5088ba2b2efdSGlen Barber  Bangladesh change (with a short turnaround since the DST change is
5089ba2b2efdSGlen Barber  impending)
5090ba2b2efdSGlen Barber
5091ba2b2efdSGlen Barber
5092ba2b2efdSGlen BarberRelease 2009i - 2009-06-08 09:21:22 -0400
5093ba2b2efdSGlen Barber
5094ba2b2efdSGlen Barber  updating for DST in Bangladesh this year
5095ba2b2efdSGlen Barber
5096ba2b2efdSGlen Barber
5097ba2b2efdSGlen BarberRelease 2009h - 2009-05-26 09:19:14 -0400
5098ba2b2efdSGlen Barber
5099ba2b2efdSGlen Barber  [not summarized]
5100ba2b2efdSGlen Barber
5101ba2b2efdSGlen Barber
5102ba2b2efdSGlen BarberRelease data2009g - 2009-04-20 16:34:07 -0400
5103ba2b2efdSGlen Barber
5104ba2b2efdSGlen Barber  Cairo
5105ba2b2efdSGlen Barber
5106ba2b2efdSGlen Barber
5107ba2b2efdSGlen BarberRelease data2009f - 2009-04-10 11:00:52 -0400
5108ba2b2efdSGlen Barber
5109ba2b2efdSGlen Barber  correct DST in Pakistan
5110ba2b2efdSGlen Barber
5111ba2b2efdSGlen Barber
5112ba2b2efdSGlen BarberRelease 2009e - 2009-04-06 09:08:11 -0400
5113ba2b2efdSGlen Barber
5114ba2b2efdSGlen Barber  [not summarized]
5115ba2b2efdSGlen Barber
5116ba2b2efdSGlen Barber
5117ba2b2efdSGlen BarberRelease 2009d - 2009-03-23 09:38:12 -0400
5118ba2b2efdSGlen Barber
5119ba2b2efdSGlen Barber  Morocco, Tunisia, Argentina, and American Astronomical Society changes
5120ba2b2efdSGlen Barber
5121ba2b2efdSGlen Barber
5122ba2b2efdSGlen BarberRelease data2009c - 2009-03-16 09:47:51 -0400
5123ba2b2efdSGlen Barber
5124ba2b2efdSGlen Barber  change to the start of Cuban DST
5125ba2b2efdSGlen Barber
5126ba2b2efdSGlen Barber
5127ba2b2efdSGlen BarberRelease 2009b - 2009-02-09 11:15:22 -0500
5128ba2b2efdSGlen Barber
5129ba2b2efdSGlen Barber  [not summarized]
5130ba2b2efdSGlen Barber
5131ba2b2efdSGlen Barber
5132ba2b2efdSGlen BarberRelease 2009a - 2009-01-21 10:09:39 -0500
5133ba2b2efdSGlen Barber
5134ba2b2efdSGlen Barber  [not summarized]
5135ba2b2efdSGlen Barber
5136ba2b2efdSGlen Barber
5137ba2b2efdSGlen BarberRelease data2008i - 2008-10-21 12:10:25 -0400
5138ba2b2efdSGlen Barber
5139ba2b2efdSGlen Barber  southamerica and zone.tab files, with Argentina DST rule changes and
5140ba2b2efdSGlen Barber  United States zone reordering and recommenting
5141ba2b2efdSGlen Barber
5142ba2b2efdSGlen Barber
5143ba2b2efdSGlen BarberRelease 2008h - 2008-10-13 07:33:56 -0400
5144ba2b2efdSGlen Barber
5145ba2b2efdSGlen Barber  [not summarized]
5146ba2b2efdSGlen Barber
5147ba2b2efdSGlen Barber
5148ba2b2efdSGlen BarberRelease 2008g - 2008-10-06 09:03:18 -0400
5149ba2b2efdSGlen Barber
5150ba2b2efdSGlen Barber  Fix a broken HTML anchor and update Brazil's DST transitions;
5151ba2b2efdSGlen Barber  there's also a slight reordering of information in tz-art.htm.
5152ba2b2efdSGlen Barber
5153ba2b2efdSGlen Barber
5154ba2b2efdSGlen BarberRelease data2008f - 2008-09-09 22:33:26 -0400
5155ba2b2efdSGlen Barber
5156ba2b2efdSGlen Barber  [not summarized]
5157ba2b2efdSGlen Barber
5158ba2b2efdSGlen Barber
5159ba2b2efdSGlen BarberRelease 2008e - 2008-07-28 14:11:17 -0400
5160ba2b2efdSGlen Barber
5161ba2b2efdSGlen Barber  changes by Arthur David Olson and Jesper Nørgaard Welen
5162ba2b2efdSGlen Barber
5163ba2b2efdSGlen Barber
5164ba2b2efdSGlen BarberRelease data2008d - 2008-07-07 09:51:38 -0400
5165ba2b2efdSGlen Barber
5166ba2b2efdSGlen Barber  changes by Arthur David Olson, Paul Eggert, and Rodrigo Severo
5167ba2b2efdSGlen Barber
5168ba2b2efdSGlen Barber
5169ba2b2efdSGlen BarberRelease data2008c - 2008-05-19 17:48:03 -0400
5170ba2b2efdSGlen Barber
5171ba2b2efdSGlen Barber  Pakistan, Morocco, and Mongolia
5172ba2b2efdSGlen Barber
5173ba2b2efdSGlen Barber
5174ba2b2efdSGlen BarberRelease data2008b - 2008-03-24 08:30:59 -0400
5175ba2b2efdSGlen Barber
5176ba2b2efdSGlen Barber  including renaming Asia/Calcutta to Asia/Kolkata, with a backward
5177ba2b2efdSGlen Barber  link provided
5178ba2b2efdSGlen Barber
5179ba2b2efdSGlen Barber
5180ba2b2efdSGlen BarberRelease 2008a - 2008-03-08 05:42:16 -0500
5181ba2b2efdSGlen Barber
5182ba2b2efdSGlen Barber  [not summarized]
5183ba2b2efdSGlen Barber
5184ba2b2efdSGlen Barber
5185ba2b2efdSGlen BarberRelease 2007k - 2007-12-31 10:25:22 -0500
5186ba2b2efdSGlen Barber
5187ba2b2efdSGlen Barber  most importantly, changes to the "southamerica" file based on
5188ba2b2efdSGlen Barber  Argentina's readoption of daylight saving time
5189ba2b2efdSGlen Barber
5190ba2b2efdSGlen Barber
5191ba2b2efdSGlen BarberRelease 2007j - 2007-12-03 09:51:01 -0500
5192ba2b2efdSGlen Barber
5193ba2b2efdSGlen Barber  1. eliminate the "P" (parameter) macro;
5194ba2b2efdSGlen Barber
5195ba2b2efdSGlen Barber  2. the "noncontroversial" changes circulated on the time zone
5196ba2b2efdSGlen Barber  mailing list (less the changes to "logwtmp.c");
5197ba2b2efdSGlen Barber
5198ba2b2efdSGlen Barber  3. eliminate "too many transition" errors when "min" is used in time
5199ba2b2efdSGlen Barber  zone rules;
5200ba2b2efdSGlen Barber
5201ba2b2efdSGlen Barber  4. changes by Paul Eggert (including updated information for Venezuela).
5202ba2b2efdSGlen Barber
5203ba2b2efdSGlen Barber
5204ba2b2efdSGlen BarberRelease data2007i - 2007-10-30 10:28:11 -0400
5205ba2b2efdSGlen Barber
5206ba2b2efdSGlen Barber  changes for Cuba and Syria
5207ba2b2efdSGlen Barber
5208ba2b2efdSGlen Barber
5209ba2b2efdSGlen BarberRelease 2007h - 2007-10-01 10:05:51 -0400
5210ba2b2efdSGlen Barber
5211ba2b2efdSGlen Barber  changes by Paul Eggert, as well as an updated link to the ICU
5212ba2b2efdSGlen Barber  project in tz-link.htm
5213ba2b2efdSGlen Barber
5214ba2b2efdSGlen Barber
5215ba2b2efdSGlen BarberRelease 2007g - 2007-08-20 10:47:59 -0400
5216ba2b2efdSGlen Barber
5217ba2b2efdSGlen Barber  changes by Paul Eggert
5218ba2b2efdSGlen Barber
5219ba2b2efdSGlen Barber  The "leapseconds" file has been updated to incorporate the most
5220ba2b2efdSGlen Barber  recent International Earth Rotation and Reference Systems Service
5221ba2b2efdSGlen Barber  (IERS) bulletin.
5222ba2b2efdSGlen Barber
5223ba2b2efdSGlen Barber  There's an addition to tz-art.htm regarding the television show "Medium".
5224ba2b2efdSGlen Barber
5225ba2b2efdSGlen Barber
5226ba2b2efdSGlen BarberRelease 2007f - 2007-05-07 10:46:46 -0400
5227ba2b2efdSGlen Barber
5228ba2b2efdSGlen Barber  changes by Paul Eggert (including Haiti, Turks and Caicos, and New
5229ba2b2efdSGlen Barber  Zealand)
5230ba2b2efdSGlen Barber
5231ba2b2efdSGlen Barber  changes to zic.c to allow hour values greater than 24 (along with
5232ba2b2efdSGlen Barber  Paul's improved time value overflow checking)
5233ba2b2efdSGlen Barber
5234ba2b2efdSGlen Barber
5235ba2b2efdSGlen BarberRelease 2007e - 2007-04-02 10:11:52 -0400
5236ba2b2efdSGlen Barber
5237ba2b2efdSGlen Barber  Syria and Honduras changes by Paul Eggert
5238ba2b2efdSGlen Barber
5239ba2b2efdSGlen Barber  zic.c variable renaming changes by Arthur David Olson
5240ba2b2efdSGlen Barber
5241ba2b2efdSGlen Barber
5242ba2b2efdSGlen BarberRelease 2007d - 2007-03-20 08:48:30 -0400
5243ba2b2efdSGlen Barber
5244ba2b2efdSGlen Barber  changes by Paul Eggert
5245ba2b2efdSGlen Barber
5246ba2b2efdSGlen Barber  the elimination of white space at the ends of lines
5247ba2b2efdSGlen Barber
5248ba2b2efdSGlen Barber
5249ba2b2efdSGlen BarberRelease 2007c - 2007-02-26 09:09:37 -0500
5250ba2b2efdSGlen Barber
5251ba2b2efdSGlen Barber  changes by Paul Eggert
5252ba2b2efdSGlen Barber
5253ba2b2efdSGlen Barber
5254ba2b2efdSGlen BarberRelease 2007b - 2007-02-12 09:34:20 -0500
5255ba2b2efdSGlen Barber
5256ba2b2efdSGlen Barber  Paul Eggert's proposed change to the quotation handling logic in zic.c.
5257ba2b2efdSGlen Barber
5258ba2b2efdSGlen Barber  changes to the commentary in "leapseconds" reflecting the IERS
5259ba2b2efdSGlen Barber  announcement that there is to be no positive leap second at the end
5260ba2b2efdSGlen Barber  of June 2007.
5261ba2b2efdSGlen Barber
5262ba2b2efdSGlen Barber
5263ba2b2efdSGlen BarberRelease 2007a - 2007-01-08 12:28:29 -0500
5264ba2b2efdSGlen Barber
5265ba2b2efdSGlen Barber  changes by Paul Eggert
5266ba2b2efdSGlen Barber
52679f9fc6bbSPhilip Paeps  Derick Rethans's Asmara change
5268ba2b2efdSGlen Barber
5269ba2b2efdSGlen Barber  Oscar van Vlijmen's Easter Island local mean time change
5270ba2b2efdSGlen Barber
5271ba2b2efdSGlen Barber  symbolic link changes
5272ba2b2efdSGlen Barber
5273ba2b2efdSGlen Barber
5274ba2b2efdSGlen BarberRelease 2006p - 2006-11-27 08:54:27 -0500
5275ba2b2efdSGlen Barber
5276ba2b2efdSGlen Barber  changes by Paul Eggert
5277ba2b2efdSGlen Barber
5278ba2b2efdSGlen Barber
5279ba2b2efdSGlen BarberRelease 2006o - 2006-11-06 09:18:07 -0500
5280ba2b2efdSGlen Barber
5281ba2b2efdSGlen Barber  changes by Paul Eggert
5282ba2b2efdSGlen Barber
5283ba2b2efdSGlen Barber
5284ba2b2efdSGlen BarberRelease 2006n - 2006-10-10 11:32:06 -0400
5285ba2b2efdSGlen Barber
5286ba2b2efdSGlen Barber  changes by Paul Eggert
5287ba2b2efdSGlen Barber
5288ba2b2efdSGlen Barber
5289ba2b2efdSGlen BarberRelease 2006m - 2006-10-02 15:32:35 -0400
5290ba2b2efdSGlen Barber
5291ba2b2efdSGlen Barber  changes for Uruguay, Palestine, and Egypt by Paul Eggert
5292ba2b2efdSGlen Barber
5293ba2b2efdSGlen Barber  (minimalist) changes to zic.8 to clarify "until" information
5294ba2b2efdSGlen Barber
5295ba2b2efdSGlen Barber
5296ba2b2efdSGlen BarberRelease data2006l - 2006-09-18 12:58:11 -0400
5297ba2b2efdSGlen Barber
5298ba2b2efdSGlen Barber  Paul's best-effort work on this coming weekend's Egypt time change
5299ba2b2efdSGlen Barber
5300ba2b2efdSGlen Barber
5301ba2b2efdSGlen BarberRelease 2006k - 2006-08-28 12:19:09 -0400
5302ba2b2efdSGlen Barber
5303ba2b2efdSGlen Barber  changes by Paul Eggert
5304ba2b2efdSGlen Barber
5305ba2b2efdSGlen Barber
5306ba2b2efdSGlen BarberRelease 2006j - 2006-08-21 09:56:32 -0400
5307ba2b2efdSGlen Barber
5308ba2b2efdSGlen Barber  changes by Paul Eggert
5309ba2b2efdSGlen Barber
5310ba2b2efdSGlen Barber
5311ba2b2efdSGlen BarberRelease code2006i - 2006-08-07 12:30:55 -0400
5312ba2b2efdSGlen Barber
5313ba2b2efdSGlen Barber  localtime.c fixes
5314ba2b2efdSGlen Barber
5315ba2b2efdSGlen Barber  Ken Pizzini's conversion script
5316ba2b2efdSGlen Barber
5317ba2b2efdSGlen Barber
5318ba2b2efdSGlen BarberRelease code2006h - 2006-07-24 09:19:37 -0400
5319ba2b2efdSGlen Barber
5320ba2b2efdSGlen Barber  adds public domain notices to four files
5321ba2b2efdSGlen Barber
5322ba2b2efdSGlen Barber  includes a fix for transition times being off by a second
5323ba2b2efdSGlen Barber
5324ba2b2efdSGlen Barber  adds a new recording to the "arts" file (information courtesy Colin Bowern)
5325ba2b2efdSGlen Barber
5326ba2b2efdSGlen Barber
5327ba2b2efdSGlen BarberRelease 2006g - 2006-05-08 17:18:09 -0400
5328ba2b2efdSGlen Barber
5329ba2b2efdSGlen Barber  northamerica changes by Paul Eggert
5330ba2b2efdSGlen Barber
5331ba2b2efdSGlen Barber
5332ba2b2efdSGlen BarberRelease 2006f - 2006-05-01 11:46:00 -0400
5333ba2b2efdSGlen Barber
5334ba2b2efdSGlen Barber  a missing version number problem is fixed (with thanks to Bradley
5335ba2b2efdSGlen Barber  White for catching the problem)
5336ba2b2efdSGlen Barber
5337ba2b2efdSGlen Barber
5338ba2b2efdSGlen BarberRelease 2006d - 2006-04-17 14:33:43 -0400
5339ba2b2efdSGlen Barber
5340ba2b2efdSGlen Barber  changes by Paul Eggert
5341ba2b2efdSGlen Barber
5342ba2b2efdSGlen Barber  added new items to tz-arts.htm that were found by Paul
5343ba2b2efdSGlen Barber
5344ba2b2efdSGlen Barber
5345ba2b2efdSGlen BarberRelease 2006c - 2006-04-03 10:09:32 -0400
5346ba2b2efdSGlen Barber
5347ba2b2efdSGlen Barber  two sets of data changes by Paul Eggert
5348ba2b2efdSGlen Barber
5349ba2b2efdSGlen Barber  a fencepost error fix in zic.c
5350ba2b2efdSGlen Barber
5351ba2b2efdSGlen Barber  changes to zic.c and the "europe" file to minimize differences
5352ba2b2efdSGlen Barber  between output produced by the old 32-bit zic and the new 64-bit
5353ba2b2efdSGlen Barber  version
5354ba2b2efdSGlen Barber
5355ba2b2efdSGlen Barber
5356ba2b2efdSGlen BarberRelease 2006b - 2006-02-20 10:08:18 -0500
5357ba2b2efdSGlen Barber  [tz32code2006b + tz64code2006b + tzdata2006b]
5358ba2b2efdSGlen Barber
5359ba2b2efdSGlen Barber  64-bit code
5360ba2b2efdSGlen Barber
5361ba2b2efdSGlen Barber  All SCCS IDs were bumped to "8.1" for this release.
5362ba2b2efdSGlen Barber
5363ba2b2efdSGlen Barber
5364ba2b2efdSGlen BarberRelease 2006a - 2006-01-30 08:59:31 -0500
5365ba2b2efdSGlen Barber
5366ba2b2efdSGlen Barber  changes by Paul Eggert (in particular, Indiana time zone moves)
5367ba2b2efdSGlen Barber
5368ba2b2efdSGlen Barber  an addition to the zic manual page to describe how special-case
5369ba2b2efdSGlen Barber  transitions are handled
5370ba2b2efdSGlen Barber
5371ba2b2efdSGlen Barber
5372ba2b2efdSGlen BarberRelease 2005r - 2005-12-27 09:27:13 -0500
5373ba2b2efdSGlen Barber
5374ba2b2efdSGlen Barber  Canadian changes by Paul Eggert
5375ba2b2efdSGlen Barber
5376ba2b2efdSGlen Barber  They also add "<pre>" directives to time zone data files and reflect
5377ba2b2efdSGlen Barber  changes to warning message logic in "zdump.c" (but with calls to
5378ba2b2efdSGlen Barber  "gettext" kept unbundled at the suggestion of Ken Pizzini).
5379ba2b2efdSGlen Barber
5380ba2b2efdSGlen Barber
5381ba2b2efdSGlen BarberRelease 2005q - 2005-12-13 09:17:09 -0500
5382ba2b2efdSGlen Barber
5383ba2b2efdSGlen Barber  Nothing earth-shaking here:
5384ba2b2efdSGlen Barber	1.  Electronic mail addresses have been removed.
5385ba2b2efdSGlen Barber	2.  Casts of the return value of exit have been removed.
5386ba2b2efdSGlen Barber	3.  Casts of the argument of is.* macros have been added.
5387ba2b2efdSGlen Barber	4.  Indentation in one section of zic.c has been fixed.
5388ba2b2efdSGlen Barber	5.  References to dead URLs in the data files have been dealt with.
5389ba2b2efdSGlen Barber
5390ba2b2efdSGlen Barber
5391ba2b2efdSGlen BarberRelease 2005p - 2005-12-05 10:30:53 -0500
5392ba2b2efdSGlen Barber
5393ba2b2efdSGlen Barber  "systemv", "tz-link.htm", and "zdump.c" changes
5394ba2b2efdSGlen Barber  (less the casts of arguments to the is* macros)
5395ba2b2efdSGlen Barber
5396ba2b2efdSGlen Barber
5397ba2b2efdSGlen BarberRelease 2005o - 2005-11-28 10:55:26 -0500
5398ba2b2efdSGlen Barber
5399ba2b2efdSGlen Barber  Georgia, Cuba, Nicaragua, and Jordan changes by Paul Eggert
5400ba2b2efdSGlen Barber
5401ba2b2efdSGlen Barber  zdump.c lint fixes by Arthur David Olson
5402ba2b2efdSGlen Barber
5403ba2b2efdSGlen Barber
5404ba2b2efdSGlen BarberRelease 2005n - 2005-10-03 09:44:09 -0400
5405ba2b2efdSGlen Barber
5406ba2b2efdSGlen Barber  changes by Paul Eggert (both the Uruguay changes and the Kyrgyzstan
5407ba2b2efdSGlen Barber  et al. changes)
5408ba2b2efdSGlen Barber
5409ba2b2efdSGlen Barber
5410ba2b2efdSGlen BarberRelease 2005m - 2005-08-29 12:15:40 -0400
5411ba2b2efdSGlen Barber
5412ba2b2efdSGlen Barber  changes by Paul Eggert (with a small tweak to the tz-art change)
5413ba2b2efdSGlen Barber
5414ba2b2efdSGlen Barber  a declaration of an unused variable has been removed from zdump.c
5415ba2b2efdSGlen Barber
5416ba2b2efdSGlen Barber
5417ba2b2efdSGlen BarberRelease 2005l - 2005-08-22 12:06:39 -0400
5418ba2b2efdSGlen Barber
5419ba2b2efdSGlen Barber  changes by Paul Eggert
5420ba2b2efdSGlen Barber
5421ba2b2efdSGlen Barber  overflow/underflow checks by Arthur David Olson, minus changes to
5422ba2b2efdSGlen Barber  the "Theory" file about the pending addition of 64-bit data (I grow
5423ba2b2efdSGlen Barber  less confident of the changes being accepted with each passing day,
5424ba2b2efdSGlen Barber  and the changes no longer increase the data files nine-fold--there's
5425ba2b2efdSGlen Barber  less than a doubling in size by my local Sun's reckoning)
5426ba2b2efdSGlen Barber
5427ba2b2efdSGlen Barber
5428ba2b2efdSGlen BarberRelease 2005k - 2005-07-14 14:14:24 -0400
5429ba2b2efdSGlen Barber
5430ba2b2efdSGlen Barber  The "leapseconds" file has been edited to reflect the recently
5431ba2b2efdSGlen Barber  announced leap second at the end of 2005.
5432ba2b2efdSGlen Barber
5433ba2b2efdSGlen Barber  I've also deleted electronic mail addresses from the files as an
5434ba2b2efdSGlen Barber  anti-spam measure.
5435ba2b2efdSGlen Barber
5436ba2b2efdSGlen Barber
5437ba2b2efdSGlen BarberRelease 2005j - 2005-06-13 14:34:13 -0400
5438ba2b2efdSGlen Barber
5439ba2b2efdSGlen Barber  These reflect changes to limit the length of time zone abbreviations
5440ba2b2efdSGlen Barber  and the characters used in those abbreviations.
5441ba2b2efdSGlen Barber
5442ba2b2efdSGlen Barber  There are also changes to handle POSIX-style "quoted" timezone
5443ba2b2efdSGlen Barber  environment variables.
5444ba2b2efdSGlen Barber
5445ba2b2efdSGlen Barber  The changes were circulated on the time zone mailing list; the only
5446ba2b2efdSGlen Barber  change since then was the removal of a couple of minimum-length of
5447ba2b2efdSGlen Barber  abbreviation checks.
5448ba2b2efdSGlen Barber
5449ba2b2efdSGlen Barber
5450ba2b2efdSGlen BarberRelease data2005i - 2005-04-21 15:04:16 -0400
5451ba2b2efdSGlen Barber
5452ba2b2efdSGlen Barber  changes (most importantly to Nicaragua and Haiti) by Paul Eggert
5453ba2b2efdSGlen Barber
5454ba2b2efdSGlen Barber
5455ba2b2efdSGlen BarberRelease 2005h - 2005-04-04 11:24:47 -0400
5456ba2b2efdSGlen Barber
5457ba2b2efdSGlen Barber  changes by Paul Eggert
5458ba2b2efdSGlen Barber
5459ba2b2efdSGlen Barber  minor changes to Makefile and zdump.c to produce more useful output
5460ba2b2efdSGlen Barber  when doing a "make typecheck"
5461ba2b2efdSGlen Barber
5462ba2b2efdSGlen Barber
5463ba2b2efdSGlen BarberRelease 2005g - 2005-03-14 10:11:21 -0500
5464ba2b2efdSGlen Barber
5465ba2b2efdSGlen Barber  changes by Paul Eggert (a change to current DST rules in Uruguay and
5466ba2b2efdSGlen Barber  an update to a link to time zone software)
5467ba2b2efdSGlen Barber
5468ba2b2efdSGlen Barber
5469ba2b2efdSGlen BarberRelease 2005f - 2005-03-01 08:45:32 -0500
5470ba2b2efdSGlen Barber
5471ba2b2efdSGlen Barber  data and documentation changes by Paul Eggert
5472ba2b2efdSGlen Barber
5473ba2b2efdSGlen Barber
5474ba2b2efdSGlen BarberRelease 2005e - 2005-02-10 15:59:44 -0500
5475ba2b2efdSGlen Barber
5476ba2b2efdSGlen Barber  [not summarized]
5477ba2b2efdSGlen Barber
5478ba2b2efdSGlen Barber
5479ba2b2efdSGlen BarberRelease code2005d - 2005-01-31 09:21:47 -0500
5480ba2b2efdSGlen Barber
5481ba2b2efdSGlen Barber  make zic complain about links to links if the -v flag is used
5482ba2b2efdSGlen Barber
5483ba2b2efdSGlen Barber  have "make public" do more code checking
5484ba2b2efdSGlen Barber
5485ba2b2efdSGlen Barber  add an include to "localtime.c" for the benefit of gcc systems
5486ba2b2efdSGlen Barber
5487ba2b2efdSGlen Barber
5488ba2b2efdSGlen BarberRelease 2005c - 2005-01-17 18:36:29 -0500
5489ba2b2efdSGlen Barber
5490ba2b2efdSGlen Barber  get better results when mktime runs on a system where time_t is double
5491ba2b2efdSGlen Barber
5492ba2b2efdSGlen Barber  changes to the data files (most importantly to Paraguay)
5493ba2b2efdSGlen Barber
5494ba2b2efdSGlen Barber
5495ba2b2efdSGlen BarberRelease 2005b - 2005-01-10 09:19:54 -0500
5496ba2b2efdSGlen Barber
5497ba2b2efdSGlen Barber  Get localtime and gmtime working on systems with exotic time_t types.
5498ba2b2efdSGlen Barber
5499ba2b2efdSGlen Barber  Update the leap second commentary in the "leapseconds" file.
5500ba2b2efdSGlen Barber
5501ba2b2efdSGlen Barber
5502ba2b2efdSGlen BarberRelease 2005a - 2005-01-01 13:13:44 -0500
5503ba2b2efdSGlen Barber
5504ba2b2efdSGlen Barber  [not summarized]
5505ba2b2efdSGlen Barber
5506ba2b2efdSGlen Barber
5507ba2b2efdSGlen BarberRelease code2004i - 2004-12-14 13:42:58 -0500
5508ba2b2efdSGlen Barber
5509ba2b2efdSGlen Barber  Deal with systems where time_t is unsigned.
5510ba2b2efdSGlen Barber
5511ba2b2efdSGlen Barber
5512ba2b2efdSGlen BarberRelease code2004h - 2004-12-07 11:40:18 -0500
5513ba2b2efdSGlen Barber
5514ba2b2efdSGlen Barber  64-bit-time_t changes
5515ba2b2efdSGlen Barber
5516ba2b2efdSGlen Barber
5517ba2b2efdSGlen BarberRelease 2004g - 2004-11-02 09:06:01 -0500
5518ba2b2efdSGlen Barber
5519ba2b2efdSGlen Barber  update to Cuba (taking effect this weekend)
5520ba2b2efdSGlen Barber
5521ba2b2efdSGlen Barber  other changes by Paul Eggert
5522ba2b2efdSGlen Barber
5523ba2b2efdSGlen Barber  correction of the spelling of Oslo
5524ba2b2efdSGlen Barber
5525ba2b2efdSGlen Barber  changed versions of difftime.c and private.h
5526ba2b2efdSGlen Barber
5527ba2b2efdSGlen Barber
5528ba2b2efdSGlen BarberRelease code2004f - 2004-10-21 10:25:22 -0400
5529ba2b2efdSGlen Barber
5530ba2b2efdSGlen Barber  Cope with wide-ranging tm_year values.
5531ba2b2efdSGlen Barber
5532ba2b2efdSGlen Barber
5533ba2b2efdSGlen BarberRelease 2004e - 2004-10-11 14:47:21 -0400
5534ba2b2efdSGlen Barber
5535ba2b2efdSGlen Barber  Brazil/Argentina/Israel changes by Paul Eggert
5536ba2b2efdSGlen Barber
5537ba2b2efdSGlen Barber  changes to tz-link.htm by Paul
5538ba2b2efdSGlen Barber
5539ba2b2efdSGlen Barber  one small fix to Makefile
5540ba2b2efdSGlen Barber
5541ba2b2efdSGlen Barber
5542ba2b2efdSGlen BarberRelease 2004d - 2004-09-22 08:27:29 -0400
5543ba2b2efdSGlen Barber
5544ba2b2efdSGlen Barber  Avoid overflow problems when TM_YEAR_BASE is added to an integer.
5545ba2b2efdSGlen Barber
5546ba2b2efdSGlen Barber
5547ba2b2efdSGlen BarberRelease 2004c - 2004-08-11 12:06:26 -0400
5548ba2b2efdSGlen Barber
5549ba2b2efdSGlen Barber  asctime-related changes
5550ba2b2efdSGlen Barber
5551ba2b2efdSGlen Barber  (variants of) some of the documentation changes suggested by Paul Eggert
5552ba2b2efdSGlen Barber
5553ba2b2efdSGlen Barber
5554ba2b2efdSGlen BarberRelease 2004b - 2004-07-19 14:33:35 -0400
5555ba2b2efdSGlen Barber
5556ba2b2efdSGlen Barber  data changes by Paul Eggert - most importantly, updates for Argentina
5557ba2b2efdSGlen Barber
5558ba2b2efdSGlen Barber
5559ba2b2efdSGlen BarberRelease 2004a - 2004-05-27 12:00:47 -0400
5560ba2b2efdSGlen Barber
5561ba2b2efdSGlen Barber  changes by Paul Eggert
5562ba2b2efdSGlen Barber
5563ba2b2efdSGlen Barber  Handle DST transitions that occur at the end of a month in some
5564ba2b2efdSGlen Barber  years but at the start of the following month in other years.
5565ba2b2efdSGlen Barber
5566ba2b2efdSGlen Barber  Add a copy of the correspondence that's the basis for claims about
5567ba2b2efdSGlen Barber  DST in the Navajo Nation.
5568ba2b2efdSGlen Barber
5569ba2b2efdSGlen Barber
5570ba2b2efdSGlen BarberRelease 2003e - 2003-12-15 09:36:47 -0500
5571ba2b2efdSGlen Barber
5572ba2b2efdSGlen Barber  changes by Arthur David Olson (primarily code changes)
5573ba2b2efdSGlen Barber
5574ba2b2efdSGlen Barber  changes by Paul Eggert (primarily data changes)
5575ba2b2efdSGlen Barber
5576ba2b2efdSGlen Barber  minor changes to "Makefile" and "northamerica" (in the latter case,
5577ba2b2efdSGlen Barber  optimization of the "Toronto" rules)
5578ba2b2efdSGlen Barber
5579ba2b2efdSGlen Barber
5580ba2b2efdSGlen BarberRelease 2003d - 2003-10-06 09:34:44 -0400
5581ba2b2efdSGlen Barber
5582ba2b2efdSGlen Barber  changes by Paul Eggert
5583ba2b2efdSGlen Barber
5584ba2b2efdSGlen Barber
5585ba2b2efdSGlen BarberRelease 2003c - 2003-09-16 10:47:05 -0400
5586ba2b2efdSGlen Barber
5587ba2b2efdSGlen Barber  Fix bad returns in zic.c's inleap function.
5588ba2b2efdSGlen Barber  Thanks to Bradley White for catching the problem!
5589ba2b2efdSGlen Barber
5590ba2b2efdSGlen Barber
5591ba2b2efdSGlen BarberRelease 2003b - 2003-09-16 07:13:44 -0400
5592ba2b2efdSGlen Barber
5593ba2b2efdSGlen Barber  Add a "--version" option (and documentation) to the zic and zdump commands.
5594ba2b2efdSGlen Barber
5595ba2b2efdSGlen Barber  changes to overflow/underflow checking in zic
5596ba2b2efdSGlen Barber
5597ba2b2efdSGlen Barber  a localtime typo fix.
5598ba2b2efdSGlen Barber
5599ba2b2efdSGlen Barber  Update the leapseconds and tz-art.htm files.
5600ba2b2efdSGlen Barber
5601ba2b2efdSGlen Barber
5602ba2b2efdSGlen BarberRelease 2003a - 2003-03-24 09:30:54 -0500
5603ba2b2efdSGlen Barber
5604ba2b2efdSGlen Barber  changes by Paul Eggert
5605ba2b2efdSGlen Barber
5606ba2b2efdSGlen Barber  a few additions and modifications to the tz-art.htm file
5607ba2b2efdSGlen Barber
5608ba2b2efdSGlen Barber
5609ba2b2efdSGlen BarberRelease 2002d - 2002-10-15 13:12:42 -0400
5610ba2b2efdSGlen Barber
5611ba2b2efdSGlen Barber  changes by Paul Eggert, less the "Britain (UK)" change in iso3166.tab
5612ba2b2efdSGlen Barber
5613ba2b2efdSGlen Barber  There's also a new time zone quote in "tz-art.htm".
5614ba2b2efdSGlen Barber
5615ba2b2efdSGlen Barber
5616ba2b2efdSGlen BarberRelease 2002c - 2002-04-04 11:55:20 -0500
5617ba2b2efdSGlen Barber
5618ba2b2efdSGlen Barber  changes by Paul Eggert
5619ba2b2efdSGlen Barber
5620ba2b2efdSGlen Barber  Change zic.c to avoid creating symlinks to files that don't exist.
5621ba2b2efdSGlen Barber
5622ba2b2efdSGlen Barber
5623ba2b2efdSGlen BarberRelease 2002b - 2002-01-28 12:56:03 -0500
5624ba2b2efdSGlen Barber
5625ba2b2efdSGlen Barber  [These change notes are for Release 2002a, which was corrupted.
5626ba2b2efdSGlen Barber  2002b was a corrected version of 2002a.]
5627ba2b2efdSGlen Barber
5628ba2b2efdSGlen Barber  changes by Paul Eggert
5629ba2b2efdSGlen Barber
5630ba2b2efdSGlen Barber  Update the "leapseconds" file to note that there'll be no leap
5631ba2b2efdSGlen Barber  second at the end of June, 2002.
5632ba2b2efdSGlen Barber
5633ba2b2efdSGlen Barber  Change "zic.c" to deal with a problem in handling the "Asia/Bishkek" zone.
5634ba2b2efdSGlen Barber
5635ba2b2efdSGlen Barber  Change to "difftime.c" to avoid sizeof problems.
5636ba2b2efdSGlen Barber
5637ba2b2efdSGlen Barber
5638ba2b2efdSGlen BarberRelease 2001d - 2001-10-09 13:31:32 -0400
5639ba2b2efdSGlen Barber
5640ba2b2efdSGlen Barber  changes by Paul Eggert
5641ba2b2efdSGlen Barber
5642ba2b2efdSGlen Barber
5643ba2b2efdSGlen BarberRelease 2001c - 2001-06-05 13:59:55 -0400
5644ba2b2efdSGlen Barber
5645ba2b2efdSGlen Barber  changes by Paul Eggert and Andrew Brown
5646ba2b2efdSGlen Barber
5647ba2b2efdSGlen Barber
5648ba2b2efdSGlen BarberRelease 2001b - 2001-04-05 16:44:38 -0400
5649ba2b2efdSGlen Barber
5650ba2b2efdSGlen Barber  changes by Paul Eggert (modulo jnorgard's typo fix)
5651ba2b2efdSGlen Barber
5652ba2b2efdSGlen Barber  tz-art.htm has been HTMLified.
5653ba2b2efdSGlen Barber
5654ba2b2efdSGlen Barber
5655ba2b2efdSGlen BarberRelease 2001a - 2001-03-13 12:57:44 -0500
5656ba2b2efdSGlen Barber
5657ba2b2efdSGlen Barber  changes by Paul Eggert
5658ba2b2efdSGlen Barber
5659ba2b2efdSGlen Barber  An addition to the "leapseconds" file: comments with the text of the
5660ba2b2efdSGlen Barber  latest IERS leap second notice.
5661ba2b2efdSGlen Barber
5662ba2b2efdSGlen Barber  Trailing white space has been removed from data file lines, and
5663ba2b2efdSGlen Barber  repeated spaces in "Rule Jordan" lines in the "asia" file have been
5664ba2b2efdSGlen Barber  converted to tabs.
5665ba2b2efdSGlen Barber
5666ba2b2efdSGlen Barber
5667ba2b2efdSGlen BarberRelease 2000h - 2000-12-14 15:33:38 -0500
5668ba2b2efdSGlen Barber
5669ba2b2efdSGlen Barber  changes by Paul Eggert
5670ba2b2efdSGlen Barber
5671ba2b2efdSGlen Barber  one typo fix in the "art" file
5672ba2b2efdSGlen Barber
5673ba2b2efdSGlen Barber  With providence, this is the last update of the millennium.
5674ba2b2efdSGlen Barber
5675ba2b2efdSGlen Barber
5676ba2b2efdSGlen BarberRelease 2000g - 2000-10-10 11:35:22 -0400
5677ba2b2efdSGlen Barber
5678ba2b2efdSGlen Barber  changes by Paul Eggert
5679ba2b2efdSGlen Barber
5680ba2b2efdSGlen Barber  correction of John Mackin's name submitted by Robert Elz
5681ba2b2efdSGlen Barber
5682ba2b2efdSGlen Barber  Garry Shandling's Daylight Saving Time joke (!?!) from the recent
5683ba2b2efdSGlen Barber  Emmy Awards broadcast.
5684ba2b2efdSGlen Barber
5685ba2b2efdSGlen Barber
5686ba2b2efdSGlen BarberRelease 2000f - 2000-08-10 09:31:58 -0400
5687ba2b2efdSGlen Barber
5688ba2b2efdSGlen Barber  changes by Paul Eggert
5689ba2b2efdSGlen Barber
5690ba2b2efdSGlen Barber  Added information in "tz-art.htm" on a Seinfeld reference to DST.
5691ba2b2efdSGlen Barber
5692ba2b2efdSGlen Barber  Error checking and messages in the "yearistype" script have been
5693ba2b2efdSGlen Barber  improved.
5694ba2b2efdSGlen Barber
5695ba2b2efdSGlen Barber
5696ba2b2efdSGlen BarberRelease 2000e - 2000-07-31 09:27:54 -0400
5697ba2b2efdSGlen Barber
5698ba2b2efdSGlen Barber  data changes by Paul Eggert
5699ba2b2efdSGlen Barber
5700ba2b2efdSGlen Barber  a change to the default value of the defined constant HAVE_STRERROR
5701ba2b2efdSGlen Barber
5702ba2b2efdSGlen Barber  the addition of a Dave Barry quote on DST to the tz-arts file
5703ba2b2efdSGlen Barber
5704ba2b2efdSGlen Barber
5705ba2b2efdSGlen BarberRelease 2000d - 2000-04-20 15:43:04 -0400
5706ba2b2efdSGlen Barber
5707ba2b2efdSGlen Barber  changes to the documentation and code of strftime for C99 conformance
5708ba2b2efdSGlen Barber
5709ba2b2efdSGlen Barber  a bug fix for date.c
5710ba2b2efdSGlen Barber
5711ba2b2efdSGlen Barber  These are based on (though modified from) changes by Paul Eggert.
5712ba2b2efdSGlen Barber
5713ba2b2efdSGlen Barber
5714ba2b2efdSGlen BarberRelease 2000c - 2000-03-04 10:31:43 -0500
5715ba2b2efdSGlen Barber
5716ba2b2efdSGlen Barber  changes by Paul Eggert
5717ba2b2efdSGlen Barber
5718ba2b2efdSGlen Barber
5719ba2b2efdSGlen BarberRelease 2000b - 2000-02-21 12:16:29 -0500
5720ba2b2efdSGlen Barber
5721ba2b2efdSGlen Barber  changes by Paul Eggert and Joseph Myers
5722ba2b2efdSGlen Barber
5723ba2b2efdSGlen Barber  modest tweaks to the tz-art.htm and tz-link.htm files
5724ba2b2efdSGlen Barber
5725ba2b2efdSGlen Barber
5726ba2b2efdSGlen BarberRelease 2000a - 2000-01-18 09:21:26 -0500
5727ba2b2efdSGlen Barber
5728ba2b2efdSGlen Barber  changes by Paul Eggert
5729ba2b2efdSGlen Barber
5730ba2b2efdSGlen Barber  The two hypertext documents have also been renamed.
5731ba2b2efdSGlen Barber
5732ba2b2efdSGlen Barber
5733ba2b2efdSGlen BarberRelease code1999i-data1999j - 1999-11-15 18:43:22 -0500
5734ba2b2efdSGlen Barber
5735ba2b2efdSGlen Barber  Paul Eggert's changes
5736ba2b2efdSGlen Barber
5737ba2b2efdSGlen Barber  additions to the "zic" manual page and the "Arts.htm" file
5738ba2b2efdSGlen Barber
5739ba2b2efdSGlen Barber
5740ba2b2efdSGlen BarberRelease code1999h-data1999i - 1999-11-08 14:55:21 -0500
5741ba2b2efdSGlen Barber
5742ba2b2efdSGlen Barber  [not summarized]
5743ba2b2efdSGlen Barber
5744ba2b2efdSGlen Barber
5745ba2b2efdSGlen BarberRelease data1999h - 1999-10-07 03:50:29 -0400
5746ba2b2efdSGlen Barber
5747ba2b2efdSGlen Barber  changes by Paul Eggert to "europe" (most importantly, fixing
5748ba2b2efdSGlen Barber  Lithuania and Estonia)
5749ba2b2efdSGlen Barber
5750ba2b2efdSGlen Barber
5751ba2b2efdSGlen BarberRelease 1999g - 1999-09-28 11:06:18 -0400
5752ba2b2efdSGlen Barber
5753ba2b2efdSGlen Barber  data changes by Paul Eggert (most importantly, the change for
5754ba2b2efdSGlen Barber  Lebanon that buys correctness for this coming Sunday)
5755ba2b2efdSGlen Barber
5756ba2b2efdSGlen Barber  The "code" file contains changes to "Makefile" and "checktab.awk" to
5757ba2b2efdSGlen Barber  allow better checking of time zone files before they are published.
5758ba2b2efdSGlen Barber
5759ba2b2efdSGlen Barber
5760ba2b2efdSGlen BarberRelease 1999f - 1999-09-23 09:48:14 -0400
5761ba2b2efdSGlen Barber
5762ba2b2efdSGlen Barber  changes by Arthur David Olson and Paul Eggert
5763ba2b2efdSGlen Barber
5764ba2b2efdSGlen Barber
5765ba2b2efdSGlen BarberRelease 1999e - 1999-08-17 15:20:54 -0400
5766ba2b2efdSGlen Barber
5767ba2b2efdSGlen Barber  changes circulated by Paul Eggert, although the change to handling
5768ba2b2efdSGlen Barber  of DST-specifying timezone names has been commented out for now
5769ba2b2efdSGlen Barber  (search for "XXX" in "localtime.c" for details).  These files also
5770ba2b2efdSGlen Barber  do not make any changes to the start of DST in Brazil.
5771ba2b2efdSGlen Barber
5772ba2b2efdSGlen Barber  In addition to Paul's changes, there are updates to "Arts.htm" and
5773ba2b2efdSGlen Barber  cleanups of URLs.
5774ba2b2efdSGlen Barber
5775ba2b2efdSGlen Barber
5776ba2b2efdSGlen BarberRelease 1999d - 1999-03-30 11:31:07 -0500
5777ba2b2efdSGlen Barber
5778ba2b2efdSGlen Barber  changes by Paul Eggert
5779ba2b2efdSGlen Barber
5780ba2b2efdSGlen Barber  The Makefile's "make public" rule has also been changed to do a test
5781ba2b2efdSGlen Barber  compile of each individual time zone data file (which should help
5782ba2b2efdSGlen Barber  avoid problems such as the one we had with Nicosia).
5783ba2b2efdSGlen Barber
5784ba2b2efdSGlen Barber
5785ba2b2efdSGlen BarberRelease 1999c - 1999-03-25 09:47:47 -0500
5786ba2b2efdSGlen Barber
5787ba2b2efdSGlen Barber  changes by Paul Eggert, most importantly the change for Chile.
5788ba2b2efdSGlen Barber
5789ba2b2efdSGlen Barber
5790ba2b2efdSGlen BarberRelease 1999b - 1999-02-01 17:51:44 -0500
5791ba2b2efdSGlen Barber
5792ba2b2efdSGlen Barber  changes by Paul Eggert
5793ba2b2efdSGlen Barber
5794ba2b2efdSGlen Barber  code changes (suggested by Mani Varadarajan, mani at be.com) for
5795ba2b2efdSGlen Barber  correct handling of symbolic links when building using a relative directory
5796ba2b2efdSGlen Barber
5797ba2b2efdSGlen Barber  code changes to generate correct messages for failed links
5798ba2b2efdSGlen Barber
5799ba2b2efdSGlen Barber  updates to the URLs in Arts.htm
5800ba2b2efdSGlen Barber
5801ba2b2efdSGlen Barber
5802ba2b2efdSGlen BarberRelease 1999a - 1999-01-19 16:20:29 -0500
5803ba2b2efdSGlen Barber
5804ba2b2efdSGlen Barber  error message internationalizations and corrections in zic.c and
5805ba2b2efdSGlen Barber  zdump.c (as suggested by Vladimir Michl, vladimir.michl at upol.cz,
5806ba2b2efdSGlen Barber  to whom thanks!)
5807ba2b2efdSGlen Barber
5808ba2b2efdSGlen Barber
5809ba2b2efdSGlen BarberRelease code1998h-data1998i - 1998-10-01 09:56:10 -0400
5810ba2b2efdSGlen Barber
5811ba2b2efdSGlen Barber  changes for Brazil, Chile, and Germany
5812ba2b2efdSGlen Barber
5813ba2b2efdSGlen Barber  support for use of "24:00" in the input files for the time zone compiler
5814ba2b2efdSGlen Barber
5815ba2b2efdSGlen Barber
5816ba2b2efdSGlen BarberRelease code1998g-data1998h - 1998-09-24 10:50:28 -0400
5817ba2b2efdSGlen Barber
5818ba2b2efdSGlen Barber  changes by Paul Eggert
5819ba2b2efdSGlen Barber
5820ba2b2efdSGlen Barber  correction to a define in the "private.h" file
5821ba2b2efdSGlen Barber
5822ba2b2efdSGlen Barber
5823ba2b2efdSGlen BarberRelease data1998g - 1998-08-11 03:28:35 -0000
5824ba2b2efdSGlen Barber  [tzdata1998g.tar.gz is missing!]
5825ba2b2efdSGlen Barber
5826ba2b2efdSGlen Barber  Lithuanian change provided by mgedmin at pub.osf.it
5827ba2b2efdSGlen Barber
5828ba2b2efdSGlen Barber  Move creation of the GMT link with Etc/GMT to "etcetera" (from
5829ba2b2efdSGlen Barber  "backward") to ensure that the GMT file is created even where folks
5830ba2b2efdSGlen Barber  don't want the "backward" links (as suggested by Paul Eggert).
5831ba2b2efdSGlen Barber
5832ba2b2efdSGlen Barber
5833ba2b2efdSGlen BarberRelease data1998f - 1998-07-20 13:50:00 -0000
5834ba2b2efdSGlen Barber  [tzdata1998f.tar.gz is missing!]
5835ba2b2efdSGlen Barber
5836259e2ad7SPhilip Paeps  Update the "leapseconds" file to include the newly announced
5837ba2b2efdSGlen Barber  insertion at the end of 1998.
5838ba2b2efdSGlen Barber
5839ba2b2efdSGlen Barber
5840ba2b2efdSGlen BarberRelease code1998f - 1998-06-01 10:18:31 -0400
5841ba2b2efdSGlen Barber
5842ba2b2efdSGlen Barber  addition to localtime.c by Guy Harris
5843ba2b2efdSGlen Barber
5844ba2b2efdSGlen Barber
5845ba2b2efdSGlen BarberRelease 1998e - 1998-05-28 09:56:26 -0400
5846ba2b2efdSGlen Barber
5847ba2b2efdSGlen Barber  The Makefile is changed to produce zoneinfo-posix rather than
5848ba2b2efdSGlen Barber  zoneinfo/posix, and to produce zoneinfo-leaps rather than
5849ba2b2efdSGlen Barber  zoneinfo/right.
5850ba2b2efdSGlen Barber
5851ba2b2efdSGlen Barber  data changes by Paul Eggert
5852ba2b2efdSGlen Barber
5853ba2b2efdSGlen Barber  changes from Guy Harris to provide asctime_r and ctime_r
5854ba2b2efdSGlen Barber
5855ba2b2efdSGlen Barber  A usno1998 file (substantially identical to usno1997) has been added.
5856ba2b2efdSGlen Barber
5857ba2b2efdSGlen Barber
5858ba2b2efdSGlen BarberRelease 1998d - 1998-05-14 11:58:34 -0400
5859ba2b2efdSGlen Barber
5860ba2b2efdSGlen Barber  changes to comments (in particular, elimination of references to CIA maps).
5861ba2b2efdSGlen Barber  "Arts.htm", "WWW.htm", "asia", and "australasia" are the only places
5862ba2b2efdSGlen Barber  where changes occur.
5863ba2b2efdSGlen Barber
5864ba2b2efdSGlen Barber
5865ba2b2efdSGlen BarberRelease 1998c - 1998-02-28 12:32:26 -0500
5866ba2b2efdSGlen Barber
5867ba2b2efdSGlen Barber  changes by Paul Eggert (save the "French correction," on which I'll
5868ba2b2efdSGlen Barber  wait for the dust to settle)
5869ba2b2efdSGlen Barber
5870ba2b2efdSGlen Barber  symlink changes
5871ba2b2efdSGlen Barber
5872ba2b2efdSGlen Barber  changes and additions to Arts.htm
5873ba2b2efdSGlen Barber
5874ba2b2efdSGlen Barber
5875ba2b2efdSGlen BarberRelease 1998b - 1998-01-17 14:31:51 -0500
5876ba2b2efdSGlen Barber
5877ba2b2efdSGlen Barber  URL cleanups and additions
5878ba2b2efdSGlen Barber
5879ba2b2efdSGlen Barber
5880ba2b2efdSGlen BarberRelease 1998a - 1998-01-13 12:37:35 -0500
5881ba2b2efdSGlen Barber
5882ba2b2efdSGlen Barber  changes by Paul Eggert
5883ba2b2efdSGlen Barber
5884ba2b2efdSGlen Barber
5885ba2b2efdSGlen BarberRelease code1997i-data1997k - 1997-12-29 09:53:41 -0500
5886ba2b2efdSGlen Barber
5887ba2b2efdSGlen Barber  changes by Paul Eggert, with minor modifications from Arthur David
5888ba2b2efdSGlen Barber  Olson to make the files more browser friendly
5889ba2b2efdSGlen Barber
5890ba2b2efdSGlen Barber
5891ba2b2efdSGlen BarberRelease code1997h-data1997j - 1997-12-18 17:47:35 -0500
5892ba2b2efdSGlen Barber
5893ba2b2efdSGlen Barber  minor changes to put "TZif" at the start of each timezone information file
5894ba2b2efdSGlen Barber
5895ba2b2efdSGlen Barber  a rule has also been added to the Makefile so you can
5896ba2b2efdSGlen Barber	make zones
5897ba2b2efdSGlen Barber  to just recompile the zone information files (rather than doing a
5898ba2b2efdSGlen Barber  full "make install" with its other effects).
5899ba2b2efdSGlen Barber
5900ba2b2efdSGlen Barber
5901ba2b2efdSGlen BarberRelease data1997i - 1997-10-07 08:45:38 -0400
5902ba2b2efdSGlen Barber
5903ba2b2efdSGlen Barber  changes to Africa by Paul Eggert
5904ba2b2efdSGlen Barber
5905ba2b2efdSGlen Barber
5906ba2b2efdSGlen BarberRelease code1997g-data1997h - 1997-09-04 16:56:54 -0400
5907ba2b2efdSGlen Barber
5908ba2b2efdSGlen Barber  corrections for Uruguay (and other locations)
5909ba2b2efdSGlen Barber
5910ba2b2efdSGlen Barber  Arthur David Olson's simple-minded fix allowing mktime to both
5911ba2b2efdSGlen Barber  correctly handle leap seconds and correctly handle tm_sec values
5912ba2b2efdSGlen Barber  upon which arithmetic has been performed.
5913ba2b2efdSGlen Barber
5914ba2b2efdSGlen Barber
5915ba2b2efdSGlen BarberRelease code1997f-data1997g - 1997-07-19 13:15:02 -0400
5916ba2b2efdSGlen Barber
5917ba2b2efdSGlen Barber  Paul Eggert's updates
5918ba2b2efdSGlen Barber
5919ba2b2efdSGlen Barber  a small change to a function prototype;
5920ba2b2efdSGlen Barber
5921ba2b2efdSGlen Barber  "Music" has been renamed "Arts.htm", HTMLified, and augmented to
5922ba2b2efdSGlen Barber  include information on Around the World in Eighty Days.
5923ba2b2efdSGlen Barber
5924ba2b2efdSGlen Barber
5925ba2b2efdSGlen BarberRelease code1997e-data1997f - 1997-05-03 18:52:34 -0400
5926ba2b2efdSGlen Barber
5927ba2b2efdSGlen Barber  fixes to zic's error handling
5928ba2b2efdSGlen Barber
5929ba2b2efdSGlen Barber  changes inspired by the item circulated on Slovenia
5930ba2b2efdSGlen Barber
5931ba2b2efdSGlen Barber  The description of Web resources has been HTMLified for browsing
5932ba2b2efdSGlen Barber  convenience.
5933ba2b2efdSGlen Barber
5934ba2b2efdSGlen Barber  A new piece of tz-related music has been added to the "Music" file.
5935ba2b2efdSGlen Barber
5936ba2b2efdSGlen Barber
5937ba2b2efdSGlen BarberRelease code1997d-data1997e - 1997-03-29 12:48:52 -0500
5938ba2b2efdSGlen Barber
5939ba2b2efdSGlen Barber  Paul Eggert's latest suggestions
5940ba2b2efdSGlen Barber
5941ba2b2efdSGlen Barber
5942ba2b2efdSGlen BarberRelease code1997c-data1997d - 1997-03-07 20:37:54 -0500
5943ba2b2efdSGlen Barber
5944ba2b2efdSGlen Barber  changes to "zic.c" to correct performance of the "-s" option
5945ba2b2efdSGlen Barber
5946ba2b2efdSGlen Barber  a new file "usno1997"
5947ba2b2efdSGlen Barber
5948ba2b2efdSGlen Barber
5949ba2b2efdSGlen BarberRelease data1997c - 1997-03-04 09:58:18 -0500
5950ba2b2efdSGlen Barber
5951ba2b2efdSGlen Barber  changes in Israel
5952ba2b2efdSGlen Barber
5953ba2b2efdSGlen Barber
5954ba2b2efdSGlen BarberRelease 1997b - 1997-02-27 18:34:19 -0500
5955ba2b2efdSGlen Barber
5956ba2b2efdSGlen Barber  The data file incorporates the 1997 leap second.
5957ba2b2efdSGlen Barber
5958ba2b2efdSGlen Barber  The code file incorporates Arthur David Olson's take on the
5959ba2b2efdSGlen Barber  zic/multiprocessor/directory-creation situation.
5960ba2b2efdSGlen Barber
5961ba2b2efdSGlen Barber
5962ba2b2efdSGlen BarberRelease 1997a - 1997-01-21 09:11:10 -0500
5963ba2b2efdSGlen Barber
5964ba2b2efdSGlen Barber  Paul Eggert's Antarctica (and other changes)
5965ba2b2efdSGlen Barber
5966ba2b2efdSGlen Barber  Arthur David Olson finessed the "getopt" issue by checking against
5967ba2b2efdSGlen Barber  both -1 and EOF (regardless of POSIX, SunOS 4.1.1's manual says -1
5968ba2b2efdSGlen Barber  is returned while SunOS 5.5's manual says EOF is returned).
5969ba2b2efdSGlen Barber
5970ba2b2efdSGlen Barber
5971ba2b2efdSGlen BarberRelease code1996o-data1996n - 1996-12-27 21:42:05 -0500
5972ba2b2efdSGlen Barber
5973ba2b2efdSGlen Barber  Paul Eggert's latest changes
5974ba2b2efdSGlen Barber
5975ba2b2efdSGlen Barber
5976ba2b2efdSGlen BarberRelease code1996n - 1996-12-16 09:42:02 -0500
5977ba2b2efdSGlen Barber
5978ba2b2efdSGlen Barber  link snapping fix from Bruce Evans (via Garrett Wollman)
5979ba2b2efdSGlen Barber
5980ba2b2efdSGlen Barber
5981ba2b2efdSGlen BarberRelease data1996m - 1996-11-24 02:37:34 -0000
5982ba2b2efdSGlen Barber  [tzdata1996m.tar.gz is missing!]
5983ba2b2efdSGlen Barber
5984ba2b2efdSGlen Barber  Paul Eggert's batch of changes
5985ba2b2efdSGlen Barber
5986ba2b2efdSGlen Barber
5987ba2b2efdSGlen BarberRelease code1996m-data1996l - 1996-11-05 14:00:12 -0500
5988ba2b2efdSGlen Barber
5989ba2b2efdSGlen Barber  No functional changes here; the files have simply been changed to
5990ba2b2efdSGlen Barber  make more use of ISO style dates in comments. The names of the above
5991ba2b2efdSGlen Barber  files now include the year in full.
5992ba2b2efdSGlen Barber
5993ba2b2efdSGlen Barber
5994ba2b2efdSGlen BarberRelease code96l - 1996-09-08 17:12:20 -0400
5995ba2b2efdSGlen Barber
5996ba2b2efdSGlen Barber  tzcode96k was missing a couple of pieces.
5997ba2b2efdSGlen Barber
5998ba2b2efdSGlen Barber
5999ba2b2efdSGlen BarberRelease 96k - 1996-09-08 16:06:22 -0400
6000ba2b2efdSGlen Barber
6001ba2b2efdSGlen Barber  the latest round of changes from Paul Eggert
6002ba2b2efdSGlen Barber
6003ba2b2efdSGlen Barber  the recent Year 2000 material
6004ba2b2efdSGlen Barber
6005ba2b2efdSGlen Barber
6006ba2b2efdSGlen BarberRelease code96j - 1996-07-30 13:18:53 -0400
6007ba2b2efdSGlen Barber
6008ba2b2efdSGlen Barber  Set sp->typecnt as suggested by Timothy Patrick Murphy.
6009ba2b2efdSGlen Barber
6010ba2b2efdSGlen Barber
6011ba2b2efdSGlen BarberRelease code96i - 1996-07-27 20:11:35 -0400
6012ba2b2efdSGlen Barber
6013ba2b2efdSGlen Barber  Paul's suggested patch for strftime %V week numbers
6014ba2b2efdSGlen Barber
6015ba2b2efdSGlen Barber
6016ba2b2efdSGlen BarberRelease data96i - 1996-07-01 18:13:04 -0400
6017ba2b2efdSGlen Barber
6018ba2b2efdSGlen Barber  "northamerica" and "europe" changes by Paul Eggert
6019ba2b2efdSGlen Barber
6020ba2b2efdSGlen Barber
6021ba2b2efdSGlen BarberRelease code96h - 1996-06-05 08:02:21 -0400
6022ba2b2efdSGlen Barber
6023ba2b2efdSGlen Barber  fix for handling transitions specified in Universal Time
6024ba2b2efdSGlen Barber
6025ba2b2efdSGlen Barber  Some "public domain" notices have also been added.
6026ba2b2efdSGlen Barber
6027ba2b2efdSGlen Barber
6028ba2b2efdSGlen BarberRelease code96g - 1996-05-16 14:00:26 -0400
6029ba2b2efdSGlen Barber
6030ba2b2efdSGlen Barber  fix for the simultaneous-DST-and-zone-change challenge
6031ba2b2efdSGlen Barber
6032ba2b2efdSGlen Barber
6033ba2b2efdSGlen BarberRelease data96h - 1996-05-09 17:40:51 -0400
6034ba2b2efdSGlen Barber
6035ba2b2efdSGlen Barber  changes by Paul Eggert
6036ba2b2efdSGlen Barber
6037ba2b2efdSGlen Barber
6038ba2b2efdSGlen BarberRelease code96f-data96g - 1996-05-03 03:09:59 -0000
6039ba2b2efdSGlen Barber  [tzcode96f.tar.gz + tzdata96g.tar.gz are both missing!]
6040ba2b2efdSGlen Barber
6041ba2b2efdSGlen Barber  The changes get us some of the way to fixing the problems noted in Paul
6042ba2b2efdSGlen Barber  Eggert's letter yesterday (in addition to a few others).  The approach
6043ba2b2efdSGlen Barber  has been to make zic a bit smarter about figuring out what time zone
6044ba2b2efdSGlen Barber  abbreviations apply just after the time specified in the "UNTIL" part
6045ba2b2efdSGlen Barber  of a zone line.  Putting the smarts in zic means avoiding having
6046ba2b2efdSGlen Barber  transition times show up in both "Zone" lines and "Rule" lines, which
6047ba2b2efdSGlen Barber  in turn avoids multiple transition time entries in time zone files.
6048ba2b2efdSGlen Barber  (This also makes the zic input files such as "europe" a bit shorter and
6049ba2b2efdSGlen Barber  should ease maintenance.)
6050ba2b2efdSGlen Barber
6051ba2b2efdSGlen Barber
6052ba2b2efdSGlen BarberRelease data96f - 1996-04-19 19:20:03 -0000
6053ba2b2efdSGlen Barber  [tzdata96f.tar.gz is missing!]
6054ba2b2efdSGlen Barber
6055ba2b2efdSGlen Barber  The only changes are to the "northamerica" file; the time zone
6056ba2b2efdSGlen Barber  abbreviation for Denver is corrected to MST (and MDT), and the
6057ba2b2efdSGlen Barber  comments for Mexico have been updated.
6058ba2b2efdSGlen Barber
6059ba2b2efdSGlen Barber
6060ba2b2efdSGlen BarberRelease data96e - 1996-03-19 17:37:26 -0500
6061ba2b2efdSGlen Barber
6062ba2b2efdSGlen Barber  Proposals by Paul Eggert, in particular the Portugal change that
6063ba2b2efdSGlen Barber  comes into play at the end of this month.
6064ba2b2efdSGlen Barber
6065ba2b2efdSGlen Barber
6066ba2b2efdSGlen BarberRelease data96d - 1996-03-18 20:49:39 -0500
6067ba2b2efdSGlen Barber
6068ba2b2efdSGlen Barber  [not summarized]
6069ba2b2efdSGlen Barber
6070ba2b2efdSGlen Barber
6071ba2b2efdSGlen BarberRelease code96e - 1996-02-29 15:43:27 -0000
6072ba2b2efdSGlen Barber  [tzcode96e.tar.gz is missing!]
6073ba2b2efdSGlen Barber
6074ba2b2efdSGlen Barber  internationalization changes and the fix to the documentation for strftime
6075ba2b2efdSGlen Barber
6076ba2b2efdSGlen Barber
6077ba2b2efdSGlen BarberRelease code96d-data96c - 1996-02-12 11:05:27 -0500
6078ba2b2efdSGlen Barber
6079ba2b2efdSGlen Barber  The "code" file simply updates Bob Kridle's electronic address.
6080ba2b2efdSGlen Barber
6081ba2b2efdSGlen Barber  The "data" file updates rules for Mexico.
6082ba2b2efdSGlen Barber
6083ba2b2efdSGlen Barber
6084ba2b2efdSGlen BarberRelease data96b - 1996-01-27 15:44:42 -0500
6085ba2b2efdSGlen Barber
6086ba2b2efdSGlen Barber  Kiribati change
6087ba2b2efdSGlen Barber
6088ba2b2efdSGlen Barber
6089ba2b2efdSGlen BarberRelease code96c - 1996-01-16 16:58:15 -0500
6090ba2b2efdSGlen Barber
6091ba2b2efdSGlen Barber  leap-year streamlining and binary-search changes
6092ba2b2efdSGlen Barber
6093ba2b2efdSGlen Barber  fix to newctime.3
6094ba2b2efdSGlen Barber
6095ba2b2efdSGlen Barber
6096ba2b2efdSGlen BarberRelease code96b - 1996-01-10 20:42:39 -0500
6097ba2b2efdSGlen Barber
6098ba2b2efdSGlen Barber  fixes and enhancements from Paul Eggert, including code that
6099ba2b2efdSGlen Barber  emulates the behavior of recent versions of the SunOS "date"
6100ba2b2efdSGlen Barber  command.
6101ba2b2efdSGlen Barber
6102ba2b2efdSGlen Barber
6103ba2b2efdSGlen BarberRelease 96a - 1996-01-06 09:08:24 -0500
6104ba2b2efdSGlen Barber
6105ba2b2efdSGlen Barber  Israel updates
6106ba2b2efdSGlen Barber
6107ba2b2efdSGlen Barber  fixes to strftime.c for correct ISO 8601 week number generation,
6108ba2b2efdSGlen Barber  plus support for two new formats ('G' and 'g') to give ISO 8601 year
6109ba2b2efdSGlen Barber  numbers (which are not necessarily the same as calendar year numbers)
6110ba2b2efdSGlen Barber
6111ba2b2efdSGlen Barber
6112ba2b2efdSGlen BarberRelease code95i-data95m - 1995-12-21 12:46:47 -0500
6113ba2b2efdSGlen Barber
6114ba2b2efdSGlen Barber  The latest revisions from Paul Eggert are included, the usno1995
6115ba2b2efdSGlen Barber  file has been updated, and a new file ("WWW") covering useful URLs
6116ba2b2efdSGlen Barber  has been added.
6117ba2b2efdSGlen Barber
6118ba2b2efdSGlen Barber
6119ba2b2efdSGlen BarberRelease code95h-data95l - 1995-12-19 18:10:12 -0500
6120ba2b2efdSGlen Barber
6121ba2b2efdSGlen Barber  A simplification of a macro definition, a change to data for Sudan,
6122ba2b2efdSGlen Barber  and (for last minute shoppers) notes in the "Music" file on the CD
6123ba2b2efdSGlen Barber  "Old Man Time".
6124ba2b2efdSGlen Barber
6125ba2b2efdSGlen Barber
6126ba2b2efdSGlen BarberRelease code95g-data95k - 1995-10-30 10:32:47 -0500
6127ba2b2efdSGlen Barber
6128ba2b2efdSGlen Barber  (slightly reformatted) 8-bit-clean proposed patch
6129ba2b2efdSGlen Barber
6130ba2b2efdSGlen Barber  minor patch: US/Eastern -> America/New_York
6131ba2b2efdSGlen Barber
6132ba2b2efdSGlen Barber  snapshot of the USNO's latest data ("usno1995")
6133ba2b2efdSGlen Barber
6134ba2b2efdSGlen Barber  some other minor cleanups
6135ba2b2efdSGlen Barber
6136ba2b2efdSGlen Barber
6137ba2b2efdSGlen BarberRelease code95f-data95j - 1995-10-28 21:01:34 -0000
6138ba2b2efdSGlen Barber  [tzcode95f.tar.gz + tzdata95j.tar.gz are both missing!]
6139ba2b2efdSGlen Barber
6140ba2b2efdSGlen Barber  European cleanups
6141ba2b2efdSGlen Barber
6142ba2b2efdSGlen Barber  support for 64-bit time_t's
6143ba2b2efdSGlen Barber
6144ba2b2efdSGlen Barber  optimization in localtime.c
6145ba2b2efdSGlen Barber
6146ba2b2efdSGlen Barber
6147ba2b2efdSGlen BarberRelease code95e - 1995-10-13 13:23:57 -0400
6148ba2b2efdSGlen Barber
6149ba2b2efdSGlen Barber  the mktime change to scan from future to past when trying to find time zone
6150ba2b2efdSGlen Barber  offsets
6151ba2b2efdSGlen Barber
6152ba2b2efdSGlen Barber
6153ba2b2efdSGlen BarberRelease data95i - 1995-09-26 10:43:26 -0400
6154ba2b2efdSGlen Barber
6155ba2b2efdSGlen Barber  For Canada/Central, guess that the Sun customer's "one week too
6156ba2b2efdSGlen Barber  early" was just a approximation, and the true error is one month
6157ba2b2efdSGlen Barber  too early.  This is consistent with the rest of Canada.
6158ba2b2efdSGlen Barber
6159ba2b2efdSGlen Barber
6160ba2b2efdSGlen BarberRelease data95h - 1995-09-21 11:26:48 -0400
6161ba2b2efdSGlen Barber
6162ba2b2efdSGlen Barber  latest changes from Paul Eggert
6163ba2b2efdSGlen Barber
6164ba2b2efdSGlen Barber
6165ba2b2efdSGlen BarberRelease code95d - 1995-09-14 11:14:45 -0400
6166ba2b2efdSGlen Barber
6167ba2b2efdSGlen Barber  the addition of a "Music" file, which documents four recorded
6168ba2b2efdSGlen Barber  versions of the tune "Save That Time".
6169ba2b2efdSGlen Barber
6170ba2b2efdSGlen Barber
6171ba2b2efdSGlen BarberRelease data95g - 1995-09-01 17:21:36 -0400
6172ba2b2efdSGlen Barber
6173ba2b2efdSGlen Barber  "yearistype" correction
6174ba2b2efdSGlen Barber
6175ba2b2efdSGlen Barber
6176ba2b2efdSGlen BarberRelease data95f - 1995-08-28 20:46:56 -0400
6177ba2b2efdSGlen Barber
6178ba2b2efdSGlen Barber  Paul Eggert's change to the australasia file
6179ba2b2efdSGlen Barber
6180ba2b2efdSGlen Barber
6181ba2b2efdSGlen BarberRelease data95e - 1995-07-08 18:02:34 -0400
6182ba2b2efdSGlen Barber
6183ba2b2efdSGlen Barber  The only change is a leap second at the end of this year.
6184ba2b2efdSGlen Barber  Thanks to Bradley White for forwarding news on the leap second.
6185ba2b2efdSGlen Barber
6186ba2b2efdSGlen Barber
6187ba2b2efdSGlen BarberRelease data95d - 1995-07-03 13:26:22 -0400
6188ba2b2efdSGlen Barber
6189ba2b2efdSGlen Barber  Paul Eggert's changes
6190ba2b2efdSGlen Barber
6191ba2b2efdSGlen Barber
6192ba2b2efdSGlen BarberRelease data95c - 1995-07-02 19:19:28 -0400
6193ba2b2efdSGlen Barber
6194ba2b2efdSGlen Barber  changes to "asia", "backward", "europe", and "southamerica"
6195ba2b2efdSGlen Barber  (read: northamericacentrics need not apply)
6196ba2b2efdSGlen Barber
6197ba2b2efdSGlen Barber
6198ba2b2efdSGlen BarberRelease code95c - 1995-03-13 14:00:46 -0500
6199ba2b2efdSGlen Barber
6200ba2b2efdSGlen Barber  one-line fix for sign extension problems in detzcode
6201ba2b2efdSGlen Barber
6202ba2b2efdSGlen Barber
6203ba2b2efdSGlen BarberRelease 95b - 1995-03-04 11:22:38 -0500
6204ba2b2efdSGlen Barber
6205ba2b2efdSGlen Barber  Minor changes in both:
6206ba2b2efdSGlen Barber
6207ba2b2efdSGlen Barber  The "code" file contains a workaround for the lack of "unistd.h" in
6208ba2b2efdSGlen Barber  Microsoft C++ version 7.
6209ba2b2efdSGlen Barber
6210ba2b2efdSGlen Barber  The "data" file contains a fixed "Link" for America/Shiprock.
6211ba2b2efdSGlen Barber
6212ba2b2efdSGlen Barber
6213ba2b2efdSGlen BarberRelease 94h - 1994-12-10 12:51:14 -0500
6214ba2b2efdSGlen Barber
6215ba2b2efdSGlen Barber  The files:
6216ba2b2efdSGlen Barber
6217ba2b2efdSGlen Barber  *	incorporate the changes to "zdump" and "date" to make changes to
6218ba2b2efdSGlen Barber	the "TZ" environment variable permanent;
6219ba2b2efdSGlen Barber
6220ba2b2efdSGlen Barber  *	incorporate the table changes by Paul Eggert;
6221ba2b2efdSGlen Barber
6222ba2b2efdSGlen Barber  *	include (and document) support for universal time specifications in
6223ba2b2efdSGlen Barber	data files - but do not (yet) include use of this feature in the
6224ba2b2efdSGlen Barber	data files.
6225ba2b2efdSGlen Barber
6226ba2b2efdSGlen Barber  Think of this as "TZ Classic" - the software has been set up not to break if
6227ba2b2efdSGlen Barber  universal time shows up in its input, and data entries have been
6228ba2b2efdSGlen Barber  left as is so as not to break existing implementations.
6229ba2b2efdSGlen Barber
6230ba2b2efdSGlen Barber
6231ba2b2efdSGlen BarberRelease data94f - 1994-08-20 12:56:09 -0400
6232ba2b2efdSGlen Barber
6233ba2b2efdSGlen Barber  (with thanks!) the latest data updates from Paul Eggert
6234ba2b2efdSGlen Barber
6235ba2b2efdSGlen Barber
6236ba2b2efdSGlen BarberRelease data94e - 1994-06-04 13:13:53 -0400
6237ba2b2efdSGlen Barber
6238ba2b2efdSGlen Barber  [not summarized]
6239ba2b2efdSGlen Barber
6240ba2b2efdSGlen Barber
6241ba2b2efdSGlen BarberRelease code94g - 1994-05-05 12:14:07 -0400
6242ba2b2efdSGlen Barber
6243ba2b2efdSGlen Barber  fix missing "optind.c" and a reference to it in the Makefile
6244ba2b2efdSGlen Barber
6245ba2b2efdSGlen Barber
6246ba2b2efdSGlen BarberRelease code94f - 1994-05-05 13:00:33 -0000
6247ba2b2efdSGlen Barber  [tzcode94f.tar.gz is missing!]
6248ba2b2efdSGlen Barber
6249ba2b2efdSGlen Barber  changes to avoid overflow in difftime, as well as changes to cope
6250ba2b2efdSGlen Barber  with the 52/53 challenge in strftime
6251ba2b2efdSGlen Barber
6252ba2b2efdSGlen Barber
6253ba2b2efdSGlen BarberRelease code94e - 1994-03-30 23:32:59 -0500
6254ba2b2efdSGlen Barber
6255ba2b2efdSGlen Barber  change for the benefit of PCTS
6256ba2b2efdSGlen Barber
6257ba2b2efdSGlen Barber
6258ba2b2efdSGlen BarberRelease 94d - 1994-02-24 15:42:25 -0500
6259ba2b2efdSGlen Barber
6260ba2b2efdSGlen Barber  Avoid clashes with POSIX semantics for zones such as GMT+4.
6261ba2b2efdSGlen Barber
6262ba2b2efdSGlen Barber  Some other very minor housekeeping is also present.
6263ba2b2efdSGlen Barber
6264ba2b2efdSGlen Barber
6265ba2b2efdSGlen BarberRelease code94c - 1994-02-10 08:52:40 -0500
6266ba2b2efdSGlen Barber
6267ba2b2efdSGlen Barber  Fix bug where mkdirs was broken unless you compile with
6268ba2b2efdSGlen Barber  -fwritable-strings (which is generally losing to do).
6269ba2b2efdSGlen Barber
6270ba2b2efdSGlen Barber
6271ba2b2efdSGlen BarberRelease 94b - 1994-02-07 10:04:33 -0500
6272ba2b2efdSGlen Barber
6273ba2b2efdSGlen Barber  work by Paul Eggert who notes:
6274ba2b2efdSGlen Barber
6275ba2b2efdSGlen Barber  I found another book of time zone histories by E W Whitman; it's not
6276ba2b2efdSGlen Barber  as extensive as Shanks but has a few goodies of its own.  I used it
6277ba2b2efdSGlen Barber  to update the tables.  I also fixed some more as a result of
6278ba2b2efdSGlen Barber  correspondence with Adam David and Peter Ilieve, and move some stray
6279ba2b2efdSGlen Barber  links from 'europe' to 'backward'.  I corrected some scanning errors
6280ba2b2efdSGlen Barber  in usno1989.
6281ba2b2efdSGlen Barber
6282ba2b2efdSGlen Barber  As far as the code goes, I fixed zic to allow years in the range
6283ba2b2efdSGlen Barber  INT_MIN to INT_MAX; this fixed a few boundary conditions around 1900.
6284ba2b2efdSGlen Barber  And I cleaned up the zic documentation a little bit.
6285ba2b2efdSGlen Barber
6286ba2b2efdSGlen Barber
6287ba2b2efdSGlen BarberRelease data94a - 1994-02-03 08:58:54 -0500
6288ba2b2efdSGlen Barber
6289ba2b2efdSGlen Barber  It simply incorporates the recently announced leap second into the
6290ba2b2efdSGlen Barber  "leapseconds" file.
6291ba2b2efdSGlen Barber
6292ba2b2efdSGlen Barber
6293ba2b2efdSGlen BarberRelease 93g - 1993-11-22 17:28:27 -0500
6294ba2b2efdSGlen Barber
6295ba2b2efdSGlen Barber  Paul Eggert has provided a good deal of historic information (based
6296ba2b2efdSGlen Barber  on Shanks), and there are some code changes to deal with the buglets
6297ba2b2efdSGlen Barber  that crawled out in dealing with the new information.
6298ba2b2efdSGlen Barber
6299ba2b2efdSGlen Barber
6300ba2b2efdSGlen BarberRelease 93f - 1993-10-15 12:27:46 -0400
6301ba2b2efdSGlen Barber
6302ba2b2efdSGlen Barber  Paul Eggert's changes
6303ba2b2efdSGlen Barber
6304ba2b2efdSGlen Barber
6305ba2b2efdSGlen BarberRelease 93e - 1993-09-05 21:21:44 -0400
6306ba2b2efdSGlen Barber
6307ba2b2efdSGlen Barber  This has updated data for Israel, England, and Kwajalein.  There's
6308ba2b2efdSGlen Barber  also an update to "zdump" to cope with Kwajalein's 24-hour jump.
6309ba2b2efdSGlen Barber  Thanks to Paul Eggert and Peter Ilieve for the changes.
6310ba2b2efdSGlen Barber
6311ba2b2efdSGlen Barber
6312ba2b2efdSGlen BarberRelease 93d - 1993-06-17 23:34:17 -0400
6313ba2b2efdSGlen Barber
6314ba2b2efdSGlen Barber  new fix and new data on Israel
6315ba2b2efdSGlen Barber
6316ba2b2efdSGlen Barber
6317ba2b2efdSGlen BarberRelease 93c - 1993-06-06 19:31:55 -0400
6318ba2b2efdSGlen Barber
6319ba2b2efdSGlen Barber  [not summarized]
6320ba2b2efdSGlen Barber
6321ba2b2efdSGlen Barber
6322ba2b2efdSGlen BarberRelease 93b - 1993-02-02 14:53:58 -0500
6323ba2b2efdSGlen Barber
6324ba2b2efdSGlen Barber  updated "leapseconds" file
6325ba2b2efdSGlen Barber
6326ba2b2efdSGlen Barber
6327ba2b2efdSGlen BarberRelease 93 - 1993-01-08 07:01:06 -0500
6328ba2b2efdSGlen Barber
6329ba2b2efdSGlen Barber  At kre's suggestion, the package has been split in two - a code piece
6330ba2b2efdSGlen Barber  (which also includes documentation) that's only of use to folks who
6331ba2b2efdSGlen Barber  want to recompile things and a data piece useful to anyone who can
6332ba2b2efdSGlen Barber  run "zic".
6333ba2b2efdSGlen Barber
6334ba2b2efdSGlen Barber  The new version has a few changes to the data files, a few
6335ba2b2efdSGlen Barber  portability changes, and an off-by-one fix (with thanks to
6336ba2b2efdSGlen Barber  Tom Karzes at deshaw.com for providing a description and a
6337ba2b2efdSGlen Barber  solution).
6338ba2b2efdSGlen Barber
6339ba2b2efdSGlen Barber
6340ba2b2efdSGlen BarberRelease 92c - 1992-11-21 17:35:36 -0000
6341ba2b2efdSGlen Barber  [tz92c.tar.Z is missing!]
6342ba2b2efdSGlen Barber
6343ba2b2efdSGlen Barber  The fallout from the latest round of DST transitions.
6344ba2b2efdSGlen Barber
6345ba2b2efdSGlen Barber  There are changes for Portugal, Saskatchewan, and "Pacific-New";
6346ba2b2efdSGlen Barber  there's also a change to "zic.c" that makes it portable to more systems.
6347ba2b2efdSGlen Barber
6348ba2b2efdSGlen Barber
6349ba2b2efdSGlen BarberRelease 92 - 1992-04-25 18:17:03 -0000
6350ba2b2efdSGlen Barber  [tz92.tar.Z is missing!]
6351ba2b2efdSGlen Barber
6352ba2b2efdSGlen Barber  By popular demand (well, at any rate, following a request by kre at munnari)
6353ba2b2efdSGlen Barber
6354ba2b2efdSGlen Barber
6355ba2b2efdSGlen BarberThe 1989 update of the time zone package featured:
6356ba2b2efdSGlen Barber
6357ba2b2efdSGlen Barber  *	POSIXization (including interpretation of POSIX-style TZ environment
6358ba2b2efdSGlen Barber	variables, provided by Guy Harris),
6359ba2b2efdSGlen Barber  *	ANSIfication (including versions of "mktime" and "difftime"),
6360ba2b2efdSGlen Barber  *	SVIDulation (an "altzone" variable)
6361ba2b2efdSGlen Barber  *	MACHination (the "gtime" function)
6362ba2b2efdSGlen Barber  *	corrections to some time zone data (including corrections to the rules
6363ba2b2efdSGlen Barber	for Great Britain and New Zealand)
6364ba2b2efdSGlen Barber  *	reference data from the United States Naval Observatory for folks who
6365ba2b2efdSGlen Barber	want to do additional time zones
6366ba2b2efdSGlen Barber  *	and the 1989 data for Saudi Arabia.
6367ba2b2efdSGlen Barber
6368ba2b2efdSGlen Barber  (Since this code will be treated as "part of the implementation" in some
6369ba2b2efdSGlen Barber  places and as "part of the application" in others, there's no good way to
6370ba2b2efdSGlen Barber  name functions, such as timegm, that are not part of the proposed ANSI C
6371ba2b2efdSGlen Barber  standard; such functions have kept their old, underscore-free names in this
6372ba2b2efdSGlen Barber  update.)
6373ba2b2efdSGlen Barber
6374ba2b2efdSGlen Barber  And the "dysize" function has disappeared; it was present to allow
6375ba2b2efdSGlen Barber  compilation of the "date" command on old BSD systems, and a version of "date"
6376ba2b2efdSGlen Barber  is now provided in the package.  The "date" command is not created when you
6377ba2b2efdSGlen Barber  "make all" since it may lack options provided by the version distributed with
6378ba2b2efdSGlen Barber  your operating system, or may not interact with the system in the same way
6379ba2b2efdSGlen Barber  the native version does.
6380ba2b2efdSGlen Barber
6381ba2b2efdSGlen Barber  Since POSIX frowns on correct leap second handling, the default behavior of
6382ba2b2efdSGlen Barber  the "zic" command (in the absence of a "-L" option) has been changed to omit
6383ba2b2efdSGlen Barber  leap second information from its output files.
6384ba2b2efdSGlen Barber
6385ba2b2efdSGlen Barber
6386ba2b2efdSGlen Barber-----
6387ba2b2efdSGlen BarberNotes
6388ba2b2efdSGlen Barber
6389ba2b2efdSGlen BarberThis file contains copies of the part of each release announcement
6390ba2b2efdSGlen Barberthat talks about the changes in that release.  The text has been
6391ba2b2efdSGlen Barberadapted and reformatted for the purposes of this file.
6392ba2b2efdSGlen Barber
6393ba2b2efdSGlen BarberTraditionally a release R consists of a pair of tarball files,
6394ba2b2efdSGlen BarbertzcodeR.tar.gz and tzdataR.tar.gz.  However, some releases (e.g.,
6395ba2b2efdSGlen Barbercode2010a, data2012c) consist of just one or the other tarball, and a
6396ba2b2efdSGlen Barberfew (e.g., code2012c-data2012d) have tarballs with mixed version
6397ba2b2efdSGlen Barbernumbers.  Recent releases also come in an experimental format
6398ba2b2efdSGlen Barberconsisting of a single tarball tzdb-R.tar.lz with extra data.
6399ba2b2efdSGlen Barber
6400ba2b2efdSGlen BarberRelease timestamps are taken from the release's commit (for newer,
6401ba2b2efdSGlen BarberGit-based releases), from the newest file in the tarball (for older
6402ba2b2efdSGlen Barberreleases, where this info is available) or from the email announcing
640389abb9f8SPhilip Paepsthe release (if all else fails; these are marked with a time zone
640489abb9f8SPhilip Paepsabbreviation of -0000 and an "is missing!" comment).
6405ba2b2efdSGlen Barber
6406ba2b2efdSGlen BarberEarlier versions of the code and data were not announced on the tz
6407ba2b2efdSGlen Barberlist and are not summarized here.
6408ba2b2efdSGlen Barber
6409ba2b2efdSGlen BarberThis file is in the public domain.
6410ba2b2efdSGlen Barber
6411ba2b2efdSGlen BarberLocal Variables:
6412ba2b2efdSGlen Barbercoding: utf-8
6413ba2b2efdSGlen BarberEnd:
6414