xref: /freebsd/contrib/tzdata/NEWS (revision d3d381b2b194b4d24853e92eecef55f262688d1a)
1News for the tz database
2
3Release 2018e - 2018-05-01 23:42:51 -0700
4
5  Briefly:
6
7    North Korea switches back to +09 on 2018-05-05.
8    The main format uses negative DST again, for Ireland etc.
9    'make tarballs' now also builds a rearguard tarball.
10    New 's' and 'd' suffixes in SAVE columns of Rule and Zone lines.
11
12  Changes to past and future time stamps
13
14    North Korea switches back from +0830 to +09 on 2018-05-05.
15    (Thanks to Kang Seonghoon, Arthur David Olson, Seo Sanghyeon,
16    and Tim Parenti.)
17
18    Bring back the negative-DST changes of 2018a, except be more
19    compatible with data parsers that do not support negative DST.
20    Also, this now affects historical time stamps in Namibia and the
21    former Czechoslovakia, not just Ireland.  The main format now uses
22    negative DST to model time stamps in Europe/Dublin (from 1971 on),
23    Europe/Prague (1946/7), and Africa/Windhoek (1994/2017).  This
24    does not affect UT offsets, only time zone abbreviations and the
25    tm_isdst flag.  Also, this does not affect rearguard or vanguard
26    formats; effectively the main format now uses vanguard instead of
27    rearguard format.  Data parsers that do not support negative DST
28    can still use data from the rearguard tarball described below.
29
30  Changes to build procedure
31
32    The command 'make tarballs' now also builds the tarball
33    tzdataVERSION-rearguard.tar.gz, which is like tzdataVERSION.tar.gz
34    except that it uses rearguard format intended for trailing-edge
35    data parsers.
36
37  Changes to data format and to code
38
39    The SAVE column of Rule and Zone lines can now have an 's' or 'd'
40    suffix, which specifies whether the adjusted time is standard time
41    or daylight saving time.  If no suffix is given, daylight saving
42    time is used if and only if the SAVE column is nonzero; this is
43    the longstanding behavior.  Although this new feature is not used
44    in tzdata, it could be used to specify the legal time in Namibia
45    1994-2017, as opposed to the popular time (see below).
46
47  Changes to past time stamps
48
49    From 1994 through 2017 Namibia observed DST in winter, not summer.
50    That is, it used negative DST, as Ireland still does.  This change
51    does not affect UTC offsets; it affects only the tm_isdst flag and
52    the abbreviation used during summer, which is now CAT, not WAST.
53    Although (as noted by Michael Deckers) summer and winter time were
54    both simply called "standard time" in Namibian law, in common
55    practice winter time was considered to be DST (as noted by Stephen
56    Colebourne).  The full effect of this change is only in vanguard
57    format; in rearguard and main format, the tm_isdst flag is still
58    zero in winter and nonzero in summer.
59
60    In 1946/7 Czechoslovakia also observed negative DST in winter.
61    The full effect of this change is only in vanguard format; in
62    rearguard and main formats, it is modeled as plain GMT without
63    daylight saving.  Also, the dates of some 1944/5 DST transitions
64    in Czechoslovakia have been changed.
65
66
67Release 2018d - 2018-03-22 07:05:46 -0700
68
69  Briefly:
70
71  Palestine starts DST a week earlier in 2018.
72  Add support for vanguard and rearguard data consumers.
73  Add subsecond precision to source data format, though not to data.
74
75  Changes to future time stamps
76
77    In 2018, Palestine starts DST on March 24, not March 31.
78    Adjust future predictions accordingly.  (Thanks to Sharef Mustafa.)
79
80  Changes to past and future time stamps
81
82    Casey Station in Antarctica changed from +11 to +08 on 2018-03-11
83    at 04:00.  (Thanks to Steffen Thorsen.)
84
85  Changes to past time stamps
86
87    Historical transitions for Uruguay, represented by
88    America/Montevideo, have been updated per official legal documents,
89    replacing previous data mainly originating from the inventions of
90    Shanks & Pottenger.  This has resulted in adjustments ranging from
91    30 to 90 minutes in either direction over at least two dozen
92    distinct periods ranging from one day to several years in length.
93    A mere handful of pre-1991 transitions are unaffected; data since
94    then has come from more reliable contemporaneous reporting.  These
95    changes affect various timestamps in 1920-1923, 1936, 1939,
96    1942-1943, 1959, 1966-1970, 1972, 1974-1980, and 1988-1990.
97    Additionally, Uruguay's pre-standard-time UT offset has been
98    adjusted westward by 7 seconds, from UT-03:44:44 to UT-03:44:51, to
99    match the location of the Observatory of the National Meteorological
100    Institute in Montevideo.
101    (Thanks to Jeremie Bonjour, Tim Parenti, and Michael Deckers.)
102
103    Enderbury and Kiritimati skipped New Year's Eve 1994, not
104    New Year's Day 1995.  (Thanks to Kerry Shetline.)
105
106    Fix the 1912-01-01 transition for Portugal and its colonies.
107    This transition was at 00:00 according to the new UT offset, not
108    according to the old one.  Also assume that Cape Verde switched on
109    the same date as the rest, not in 1907.  This affects
110    Africa/Bissau, Africa/Sao_Tome, Asia/Macau, Atlantic/Azores,
111    Atlantic/Cape_Verde, Atlantic/Madeira, and Europe/Lisbon.
112    (Thanks to Michael Deckers.)
113
114    Fix an off-by-1 error for pre-1913 timestamps in Jamaica and in
115    Turks & Caicos.
116
117  Changes to past time zone abbreviations
118
119    MMT took effect in Uruguay from 1908-06-10, not 1898-06-28.  There
120    is no clock change associated with the transition.
121
122  Changes to build procedure
123
124    The new DATAFORM macro in the Makefile lets the installer choose
125    among three source data formats.  The idea is to lessen downstream
126    disruption when data formats are improved.
127
128    * DATAFORM=vanguard installs from the latest, bleeding-edge
129      format.  DATAFORM=main (the default) installs from the format
130      used in the 'africa' etc. files.  DATAFORM=rearguard installs
131      from a trailing-edge format.  Eventually, elements of today's
132      vanguard format should move to the main format, and similarly
133      the main format's features should eventually move to the
134      rearguard format.
135
136    * In the current version, the main and rearguard formats are
137      identical and match that of 2018c, so this change does not
138      affect default behavior.  The vanguard format currently contains
139      one feature not in the main format: negative SAVE values.  This
140      improves support for Ireland, which uses Irish Standard Time
141      (IST, UTC+01) in summer and GMT (UTC) in winter.  tzcode has
142      supported negative SAVE values for decades, and this feature
143      should move to the main format soon.  However, it will not move
144      to the rearguard format for quite some time because some
145      downstream parsers do not support it.
146
147    * The build procedure constructs three files vanguard.zi, main.zi,
148      and rearguard.zi, one for each format.  The files represent the
149      same data as closely as the formats allow.  These three files
150      are intended for downstream data consumers and are not
151      installed.  Zoneinfo parsers that do not support negative SAVE values
152      should start using rearguard.zi, so that they will be unaffected
153      when the negative-DST feature moves from vanguard to main.
154      Bleeding-edge Zoneinfo parsers that support the new features
155      already can use vanguard.zi; in this respect, current tzcode is
156      bleeding-edge.
157
158    The Makefile should now be safe for parallelized builds, and 'make
159    -j to2050new.tzs' is now much faster on a multiprocessor host
160    with GNU Make.
161
162    When built with -DSUPPRESS_TZDIR, the tzcode library no longer
163    prepends TZDIR/ to file names that do not begin with '/'.  This is
164    not recommended for general use, due to its security implications.
165    (From a suggestion by Manuela Friedrich.)
166
167  Changes to code
168
169    zic now accepts subsecond precision in expressions like
170    00:19:32.13, which is approximately the legal time of the
171    Netherlands from 1835 to 1937.  However, because it is
172    questionable whether the few recorded uses of non-integer offsets
173    had subsecond precision in practice, there are no plans for tzdata
174    to use this feature.  (Thanks to Steve Allen for pointing out
175    the limitations of historical data in this area.)
176
177    The code is a bit more portable to MS-Windows.  Installers can
178    compile with -DRESERVE_STD_EXT_IDS on MS-Windows platforms that
179    reserve identifiers like 'localtime'.  (Thanks to Manuela
180    Friedrich).
181
182  Changes to documentation and commentary
183
184    theory.html now outlines tzdb's extensions to POSIX's model for
185    civil time, and has a section "POSIX features no longer needed"
186    that lists POSIX API components that are now vestigial.
187    (From suggestions by Steve Summit.)  It also better distinguishes
188    time zones from tz regions.  (From a suggestion by Guy Harris.)
189
190    Commentary is now more consistent about using the phrase "daylight
191    saving time", to match the C name tm_isdst.  Daylight saving time
192    need not occur in summer, and need not have a positive offset from
193    standard time.
194
195    Commentary about historical transitions in Uruguay has been expanded
196    with links to many relevant legal documents.
197    (Thanks to Tim Parenti.)
198
199    Commentary now uses some non-ASCII characters with Unicode value
200    less than U+0100, as they can be useful and should work even with
201    older editors such as XEmacs.
202
203
204Release 2018c - 2018-01-22 23:00:44 -0800
205
206  Briefly:
207  Revert Irish changes that relied on negative SAVE values.
208
209  Changes to tm_isdst
210
211    Revert the 2018a change to Europe/Dublin.  As before, this change
212    does not affect UT offsets or abbreviations; it affects only
213    whether timestamps are considered to be standard time or
214    daylight-saving time, as expressed in the tm_isdst flag of C's
215    struct tm type.  This reversion is intended to be a temporary
216    workaround for problems discovered with downstream uses of
217    releases 2018a and 2018b, which implemented Irish time by using
218    negative SAVE values in the Eire rules of the 'europe' file.
219    Although negative SAVE values have been part of tzcode for many
220    years and are supported by many platforms, they were not
221    documented before 2018a and ICU and OpenJDK do not currently
222    support them.  A mechanism to export data to platforms lacking
223    support for negative DST is planned to be developed before the
224    change is reapplied.  (Problems reported by Deborah Goldsmith and
225    Stephen Colebourne.)
226
227  Changes to past time stamps
228
229    Japanese DST transitions (1948-1951) were Sundays at 00:00, not
230    Saturdays or Sundays at 02:00.  (Thanks to Takayuki Nikai.)
231
232  Changes to build procedure
233
234    The build procedure now works around mawk 1.3.3's lack of support
235    for character class expressions.  (Problem reported by Ohyama.)
236
237
238Release 2018b - 2018-01-17 23:24:48 -0800
239
240  Briefly:
241  Fix a packaging problem in tz2018a, which was missing 'pacificnew'.
242
243  Changes to build procedure
244
245    The distribution now contains the file 'pacificnew' again.
246    This file was inadvertantly omitted in the 2018a distribution.
247    (Problem reported by Matias Fonzo.)
248
249
250Release 2018a - 2018-01-12 22:29:21 -0800
251
252  Briefly:
253  São Tomé and Príncipe switched from +00 to +01.
254  Brazil's DST will now start on November's first Sunday.
255  Ireland's standard time is now in the summer, not the winter.
256  Use Debian-style installation locations, instead of 4.3BSD-style.
257  New zic option -t.
258
259  Changes to past and future time stamps
260
261    São Tomé and Príncipe switched from +00 to +01 on 2018-01-01 at
262    01:00.  (Thanks to Steffen Thorsen and Michael Deckers.)
263
264  Changes to future time stamps
265
266    Starting in 2018 southern Brazil will begin DST on November's
267    first Sunday instead of October's third Sunday.  (Thanks to
268    Steffen Thorsen.)
269
270  Changes to past time stamps
271
272    A discrepancy of 4 s in timestamps before 1931 in South Sudan has
273    been corrected.  The 'backzone' and 'zone.tab' files did not agree
274    with the 'africa' and 'zone1970.tab' files.  (Problem reported by
275    Michael Deckers.)
276
277    The abbreviation invented for Bolivia Summer Time (1931-2) is now
278    BST instead of BOST, to be more consistent with the convention
279    used for Latvian Summer Time (1918-9) and for British Summer Time.
280
281  Changes to tm_isdst
282
283    Change Europe/Dublin so that it observes Irish Standard Time (UT
284    +01) in summer and GMT (as negative daylight-saving) in winter,
285    instead of observing standard time (GMT) in winter and Irish
286    Summer Time (UT +01) in summer.  This change does not affect UT
287    offsets or abbreviations; it affects only whether timestamps are
288    considered to be standard time or daylight-saving time, as
289    expressed in the tm_isdst flag of C's struct tm type.
290    (Discrepancy noted by Derick Rethans.)
291
292  Changes to build procedure
293
294    The default installation locations have been changed to mostly
295    match Debian circa 2017, instead of being designed as an add-on to
296    4.3BSD circa 1986.  This affects the Makefile macros TOPDIR,
297    TZDIR, MANDIR, and LIBDIR.  New Makefile macros TZDEFAULT, USRDIR,
298    USRSHAREDIR, BINDIR, ZDUMPDIR, and ZICDIR let installers tailor
299    locations more precisely.  (This responds to suggestions from
300    Brian Inglis and from Steve Summit.)
301
302    The default installation procedure no longer creates the
303    backward-compatibility link US/Pacific-New, which causes
304    confusion during user setup (e.g., see Debian bug 815200).
305    Use 'make BACKWARD="backward pacificnew"' to create the link
306    anyway, for now.  Eventually we plan to remove the link entirely.
307
308    tzdata.zi now contains a version-number comment.
309    (Suggested by Tom Lane.)
310
311    The Makefile now quotes values like BACKWARD more carefully when
312    passing them to the shell.  (Problem reported by Zefram.)
313
314    Builders no longer need to specify -DHAVE_SNPRINTF on platforms
315    that have snprintf and use pre-C99 compilers.  (Problem reported
316    by Jon Skeet.)
317
318  Changes to code
319
320    zic has a new option -t FILE that specifies the location of the
321    file that determines local time when TZ is unset.  The default for
322    this location can be configured via the new TZDEFAULT makefile
323    macro, which defaults to /etc/localtime.
324
325    Diagnostics and commentary now distinguish UT from UTC more
326    carefully; see theory.html for more information about UT vs UTC.
327
328    zic has been ported to GCC 8's -Wstringop-truncation option.
329    (Problem reported by Martin Sebor.)
330
331  Changes to documentation and commentary
332
333    The zic man page now documents the longstanding behavior that
334    times and years can be out of the usual range, with negative times
335    counting backwards from midnight and with year 0 preceding year 1.
336    (Problem reported by Michael Deckers.)
337
338    The theory.html file now mentions the POSIX limit of six chars
339    per abbreviation, and lists alphabetic abbreviations used.
340
341    The files tz-art.htm and tz-link.htm have been renamed to
342    tz-art.html and tz-link.html, respectively, for consistency with
343    other file names and to simplify web server configuration.
344
345
346Release 2017c - 2017-10-20 14:49:34 -0700
347
348  Briefly:
349  Northern Cyprus switches from +03 to +02/+03 on 2017-10-29.
350  Fiji ends DST 2018-01-14, not 2018-01-21.
351  Namibia switches from +01/+02 to +02 on 2018-04-01.
352  Sudan switches from +03 to +02 on 2017-11-01.
353  Tonga likely switches from +13/+14 to +13 on 2017-11-05.
354  Turks & Caicos switches from -04 to -05/-04 on 2018-11-04.
355  A new file tzdata.zi now holds a small text copy of all data.
356  The zic input format has been regularized slightly.
357
358  Changes to future time stamps
359
360    Northern Cyprus has decided to resume EU rules starting
361    2017-10-29, thus reinstituting winter time.
362
363    Fiji ends DST 2018-01-14 instead of the 2018-01-21 previously
364    predicted.  (Thanks to Dominic Fok.)  Adjust future predictions
365    accordingly.
366
367    Namibia will switch from +01 with DST to +02 all year on
368    2017-09-03 at 02:00.  This affects UT offsets starting 2018-04-01
369    at 02:00.  (Thanks to Steffen Thorsen.)
370
371    Sudan will switch from +03 to +02 on 2017-11-01.  (Thanks to Ahmed
372    Atyya and Yahia Abdalla.)  South Sudan is not switching, so
373    Africa/Juba is no longer a link to Africa/Khartoum.
374
375    Tonga has likely ended its experiment with DST, and will not
376    adjust its clocks on 2017-11-05.  Although Tonga has not announced
377    whether it will continue to observe DST, the IATA is assuming that
378    it will not.  (Thanks to David Wade.)
379
380    Turks & Caicos will switch from -04 all year to -05 with US DST on
381    2018-03-11 at 03:00.  This affects UT offsets starting 2018-11-04
382    at 02:00.  (Thanks to Steffen Thorsen.)
383
384  Changes to past time stamps
385
386    Namibia switched from +02 to +01 on 1994-03-21, not 1994-04-03.
387    (Thanks to Arthur David Olson.)
388
389    Detroit did not observe DST in 1967.
390
391    Use railway time for Asia/Kolkata before 1941, by switching to
392    Madras local time (UT +052110) in 1870, then to IST (UT +0530) in
393    1906.  Also, treat 1941-2's +0630 as DST, like 1942-5.
394
395    Europe/Dublin's 1946 and 1947 fallback transitions occurred at
396    02:00 standard time, not 02:00 DST.  (Thanks to Michael Deckers.)
397
398    Pacific/Apia and Pacific/Pago_Pago switched from Antipodean to
399    American time in 1892, not 1879.  (Thanks to Michael Deckers.)
400
401    Adjust the 1867 transition in Alaska to better reflect the
402    historical record, by changing it to occur on 1867-10-18 at 15:30
403    Sitka time rather than at the start of 1867-10-17 local time.
404    Although strictly speaking this is accurate only for Sitka,
405    the rest of Alaska's blanks need to be filled in somehow.
406
407    Fix off-by-one errors in UT offsets for Adak and Nome before 1867.
408    (Thanks to Michael Deckers.)
409
410    Add 7 s to the UT offset in Asia/Yangon before 1920.
411
412  Changes to zone names
413
414    Remove Canada/East-Saskatchewan from the 'backward' file, as it
415    exceeded the 14-character limit and was an unused misnomer anyway.
416
417  Changes to build procedure
418
419    To support applications that prefer to read time zone data in text
420    form, two zic input files tzdata.zi and leapseconds are now
421    installed by default.  The commands 'zic tzdata.zi' and 'zic -L
422    leapseconds tzdata.zi' can reproduce the tzdata binary files
423    without and with leap seconds, respectively.  To prevent these two
424    new files from being installed, use 'make TZDATA_TEXT=', and to
425    suppress leap seconds from the tzdata text installation, use 'make
426    TZDATA_TEXT=tzdata.zi'.
427
428    'make BACKWARD=' now suppresses backward-compatibility names
429    like 'US/Pacific' that are defined in the 'backward' and
430    'pacificnew' files.
431
432    'make check' now works on systems that lack a UTF-8 locale,
433    or that lack the nsgmls program.  Set UTF8_LOCALE to configure
434    the name of a UTF-8 locale, if you have one.
435
436    Y2K runtime checks are no longer enabled by default.  Add
437    -DDEPRECATE_TWO_DIGIT_YEARS to CFLAGS to enable them, instead of
438    adding -DNO_RUN_TIME_WARNINGS_ABOUT_YEAR_2000_PROBLEMS_THANK_YOU
439    to disable them.  (New name suggested by Brian Inglis.)
440
441    The build procedure for zdump now works on AIX 7.1.
442    (Problem reported by Kees Dekker.)
443
444  Changes to code
445
446    zic and the reference runtime now reject multiple leap seconds
447    within 28 days of each other, or leap seconds before the Epoch.
448    As a result, support for double leap seconds, which was
449    obsolescent and undocumented, has been removed.  Double leap
450    seconds were an error in the C89 standard; they have never existed
451    in civil timekeeping.  (Thanks to Robert Elz and Bradley White for
452    noticing glitches in the code that uncovered this problem.)
453
454    zic now warns about use of the obsolescent and undocumented -y
455    option, and about use of the obsolescent TYPE field of Rule lines.
456
457    zic now allows unambiguous abbreviations like "Sa" and "Su" for
458    weekdays; formerly it rejected them due to a bug.  Conversely, zic
459    no longer considers non-prefixes to be abbreviations; for example,
460    it no longer accepts "lF" as an abbreviation for "lastFriday".
461    Also, zic warns about the undocumented usage with a "last-"
462    prefix, e.g., "last-Fri".
463
464    Similarly, zic now accepts the unambiguous abbreviation "L" for
465    "Link" in ordinary context and for "Leap" in leap-second context.
466    Conversely, zic no longer accepts non-prefixes such as "La" as
467    abbreviations for words like "Leap".
468
469    zic no longer accepts leap second lines in ordinary input, or
470    ordinary lines in leap second input.  Formerly, zic sometimes
471    warned about this undocumented usage and handled it incorrectly.
472
473    The new macro HAVE_TZNAME governs whether the tzname external
474    variable is exported, instead of USG_COMPAT.  USG_COMPAT now
475    governs only the external variables "timezone" and "daylight".
476    This change is needed because the three variables are not in the
477    same category: although POSIX requires tzname, it specifies the
478    other two variables as optional.  Also, USG_COMPAT is now 1 or 0:
479    if not defined, the code attempts to guess it from other macros.
480
481    localtime.c and difftime.c no longer require stdio.h, and .c files
482    other than zic.c no longer require sys/wait.h.
483
484    zdump.c no longer assumes snprintf.  (Reported by Jonathan Leffler.)
485
486    Calculation of time_t extrema works around a bug in GCC 4.8.4
487    (Reported by Stan Shebs and Joseph Myers.)
488
489    zic.c no longer mistranslates formats of line numbers in non-English
490    locales.  (Problem reported by Benno Schulenberg.)
491
492    Several minor changes have been made to the code to make it a
493    bit easier to port to MS-Windows and Solaris.  (Thanks to Kees
494    Dekker for reporting the problems.)
495
496  Changes to documentation and commentary
497
498    The two new files 'theory.html' and 'calendars' contain the
499    contents of the removed file 'Theory'.  The goal is to document
500    tzdb theory more accessibly.
501
502    The zic man page now documents abbreviation rules.
503
504    tz-link.htm now covers how to apply tzdata changes to clients.
505    (Thanks to Jorge Fábregas for the AIX link.)  It also mentions MySQL.
506
507    The leap-seconds.list URL has been updated to something that is
508    more reliable for tzdb.  (Thanks to Tim Parenti and Brian Inglis.)
509
510Release 2017b - 2017-03-17 07:30:38 -0700
511
512  Briefly: Haiti has resumed DST.
513
514  Changes to past and future time stamps
515
516    Haiti resumed observance of DST in 2017.  (Thanks to Steffen Thorsen.)
517
518  Changes to past time stamps
519
520    Liberia changed from -004430 to +00 on 1972-01-07, not 1972-05-01.
521
522    Use "MMT" to abbreviate Liberia's time zone before 1972, as "-004430"
523    is one byte over the POSIX limit.  (Problem reported by Derick Rethans.)
524
525  Changes to code
526
527    The reference localtime implementation now falls back on the
528    current US daylight-saving transition rules rather than the
529    1987-2006 rules.  This fallback occurs only when (1) the TZ
530    environment variable's value has a name like "AST4ADT" that asks
531    for daylight saving time but does not specify the rules, (2) there
532    is no file by that name, and (3) the TZDEFRULES file cannot be
533    loaded.  (Thanks to Tom Lane.)
534
535
536Release 2017a - 2017-02-28 00:05:36 -0800
537
538  Briefly: Southern Chile moves from -04/-03 to -03, and Mongolia
539  discontinues DST.
540
541  Changes to future time stamps
542
543    Mongolia no longer observes DST.  (Thanks to Ganbold Tsagaankhuu.)
544
545    Chile's Region of Magallanes moves from -04/-03 to -03 year-round.
546    Its clocks diverge from America/Santiago starting 2017-05-13 at
547    23:00, hiving off a new zone America/Punta_Arenas.  Although the
548    Chilean government says this change expires in May 2019, for now
549    assume it's permanent.  (Thanks to Juan Correa and Deborah
550    Goldsmith.)  This also affects Antarctica/Palmer.
551
552  Changes to past time stamps
553
554    Fix many entries for historical time stamps for Europe/Madrid
555    before 1979, to agree with tables compiled by Pere Planesas of the
556    National Astronomical Observatory of Spain.  As a side effect,
557    this changes some time stamps for Africa/Ceuta before 1929, which
558    are probably guesswork anyway.  (Thanks to Steve Allen and
559    Pierpaolo Bernardi for the heads-ups, and to Michael Deckers for
560    correcting the 1901 transition.)
561
562    Ecuador observed DST from 1992-11-28 to 1993-02-05.
563    (Thanks to Alois Treindl.)
564
565    Asia/Atyrau and Asia/Oral were at +03 (not +04) before 1930-06-21.
566    (Thanks to Stepan Golosunov.)
567
568  Changes to past and future time zone abbreviations
569
570    Switch to numeric time zone abbreviations for South America, as
571    part of the ongoing project of removing invented abbreviations.
572    This avoids the need to invent an abbreviation for the new Chilean
573    new zone.  Similarly, switch from invented to numeric time zone
574    abbreviations for Afghanistan, American Samoa, the Azores,
575    Bangladesh, Bhutan, the British Indian Ocean Territory, Brunei,
576    Cape Verde, Chatham Is, Christmas I, Cocos (Keeling) Is, Cook Is,
577    Dubai, East Timor, Eucla, Fiji, French Polynesia, Greenland,
578    Indochina, Iran, Iraq, Kiribati, Lord Howe, Macquarie, Malaysia,
579    the Maldives, Marshall Is, Mauritius, Micronesia, Mongolia,
580    Myanmar, Nauru, Nepal, New Caledonia, Niue, Norfolk I, Palau,
581    Papua New Guinea, the Philippines, Pitcairn, Qatar, Réunion, St
582    Pierre & Miquelon, Samoa, Saudi Arabia, Seychelles, Singapore,
583    Solomon Is, Tokelau, Tuvalu, Wake, Vanuatu, Wallis & Futuna, and
584    Xinjiang; for 20-minute daylight saving time in Ghana before 1943;
585    for half-hour daylight saving time in Belize before 1944 and in
586    the Dominican Republic before 1975; and for Canary Islands before
587    1946, for Guinea-Bissau before 1975, for Iceland before 1969, for
588    Indian Summer Time before 1942, for Indonesia before around 1964,
589    for Kenya before 1960, for Liberia before 1973, for Madeira before
590    1967, for Namibia before 1943, for the Netherlands in 1937-9, for
591    Pakistan before 1971, for Western Sahara before 1977, and for
592    Zaporozhye in 1880-1924.
593
594    For Alaska time from 1900 through 1967, instead of "CAT" use the
595    abbreviation "AST", the abbreviation commonly used at the time
596    (Atlantic Standard Time had not been standardized yet).  Use "AWT"
597    and "APT" instead of the invented abbreviations "CAWT" and "CAPT".
598
599    Use "CST" and "CDT" instead of invented abbreviations for Macau
600    before 1999 and Taiwan before 1938, and use "JST" instead of the
601    invented abbreviation "JCST" for Japan and Korea before 1938.
602
603  Change to database entry category
604
605    Move the Pacific/Johnston link from 'australasia' to 'backward',
606    since Johnston is now uninhabited.
607
608  Changes to code
609
610    zic no longer mishandles some transitions in January 2038 when it
611    attempts to work around Qt bug 53071.  This fixes a bug affecting
612    Pacific/Tongatapu that was introduced in zic 2016e.  localtime.c
613    now contains a workaround, useful when loading a file generated by
614    a buggy zic.  (Problem and localtime.c fix reported by Bradley
615    White.)
616
617    zdump -i now outputs non-hour numeric time zone abbreviations
618    without a colon, e.g., "+0530" rather than "+05:30".  This agrees
619    with zic %z and with common practice, and simplifies auditing of
620    zdump output.
621
622    zdump is now buildable again with -DUSE_LTZ=0.
623    (Problem reported by Joseph Myers.)
624
625    zdump.c now always includes private.h, to avoid code duplication
626    with private.h.  (Problem reported by Kees Dekker.)
627
628    localtime.c no longer mishandles early or late timestamps
629    when TZ is set to a POSIX-style string that specifies DST.
630    (Problem reported by Kees Dekker.)
631
632    date and strftime now cause %z to generate "-0000" instead of
633    "+0000" when the UT offset is zero and the time zone abbreviation
634    begins with "-".
635
636  Changes to documentation and commentary
637
638    The 'Theory' file now better documents choice of historical time
639    zone abbreviations.  (Problems reported by Michael Deckers.)
640
641    tz-link.htm now covers leap smearing, which is popular in clouds.
642
643
644Release 2016j - 2016-11-22 23:17:13 -0800
645
646  Briefly: Saratov, Russia moves from +03 to +04 on 2016-12-04.
647
648  Changes to future time stamps
649
650    Saratov, Russia switches from +03 to +04 on 2016-12-04 at 02:00.
651    This hives off a new zone Europe/Saratov from Europe/Volgograd.
652    (Thanks to Yuri Konotopov and Stepan Golosunov.)
653
654  Changes to past time stamps
655
656    The new zone Asia/Atyrau for Atyraū Region, Kazakhstan, is like
657    Asia/Aqtau except it switched from +05/+06 to +04/+05 in spring
658    1999, not fall 1994.  (Thanks to Stepan Golosunov.)
659
660  Changes to past time zone abbreviations
661
662    Asia/Gaza and Asia/Hebron now use "EEST", not "EET", to denote
663    summer time before 1948.  The old use of "EET" was a typo.
664
665  Changes to code
666
667    zic no longer mishandles file systems that lack hard links, fixing
668    bugs introduced in 2016g.  (Problems reported by Tom Lane.)
669    Also, when the destination already contains symbolic links, zic
670    should now work better on systems where the 'link' system call
671    does not follow symbolic links.
672
673  Changes to documentation and commentary
674
675    tz-link.htm now documents the relationship between release version
676    numbers and development-repository commit tags.  (Suggested by
677    Paul Koning.)
678
679    The 'Theory' file now documents UT.
680
681    iso3166.tab now accents "Curaçao", and commentary now mentions
682    the names "Cabo Verde" and "Czechia".  (Thanks to Jiří Boháč.)
683
684
685Release 2016i - 2016-11-01 23:19:52 -0700
686
687  Briefly: Cyprus split into two time zones on 2016-10-30, and Tonga
688  reintroduces DST on 2016-11-06.
689
690  Changes to future time stamps
691
692    Pacific/Tongatapu begins DST on 2016-11-06 at 02:00, ending on
693    2017-01-15 at 03:00.  Assume future observances in Tonga will be
694    from the first Sunday in November through the third Sunday in
695    January, like Fiji.  (Thanks to Pulu ʻAnau.)  Switch to numeric
696    time zone abbreviations for this zone.
697
698  Changes to past and future time stamps
699
700    Northern Cyprus is now +03 year round, causing a split in Cyprus
701    time zones starting 2016-10-30 at 04:00.  This creates a zone
702    Asia/Famagusta.  (Thanks to Even Scharning and Matt Johnson.)
703
704    Antarctica/Casey switched from +08 to +11 on 2016-10-22.
705    (Thanks to Steffen Thorsen.)
706
707  Changes to past time stamps
708
709    Several corrections were made for pre-1975 time stamps in Italy.
710    These affect Europe/Malta, Europe/Rome, Europe/San_Marino, and
711    Europe/Vatican.
712
713    First, the 1893-11-01 00:00 transition in Italy used the new UT
714    offset (+01), not the old (+00:49:56).  (Thanks to Michael
715    Deckers.)
716
717    Second, rules for daylight saving in Italy were changed to agree
718    with Italy's National Institute of Metrological Research (INRiM)
719    except for 1944, as follows (thanks to Pierpaolo Bernardi, Brian
720    Inglis, and Michael Deckers):
721
722      The 1916-06-03 transition was at 24:00, not 00:00.
723
724      The 1916-10-01, 1919-10-05, and 1920-09-19 transitions were at
725      00:00, not 01:00.
726
727      The 1917-09-30 and 1918-10-06 transitions were at 24:00, not
728      01:00.
729
730      The 1944-09-17 transition was at 03:00, not 01:00.  This
731      particular change is taken from Italian law as INRiM's table,
732      (which says 02:00) appears to have a typo here.  Also, keep the
733      1944-04-03 transition for Europe/Rome, as Rome was controlled by
734      Germany then.
735
736      The 1967-1970 and 1972-1974 fallback transitions were at 01:00,
737      not 00:00.
738
739  Changes to code
740
741    The code should now be buildable on AmigaOS merely by setting the
742    appropriate Makefile variables.  (From a patch by Carsten Larsen.)
743
744
745Release 2016h - 2016-10-19 23:17:57 -0700
746
747  Changes to future time stamps
748
749    Asia/Gaza and Asia/Hebron end DST on 2016-10-29 at 01:00, not
750    2016-10-21 at 00:00.  (Thanks to Sharef Mustafa.)  Predict that
751    future fall transitions will be on the last Saturday of October
752    at 01:00, which is consistent with predicted spring transitions
753    on the last Saturday of March.  (Thanks to Tim Parenti.)
754
755  Changes to past time stamps
756
757    In Turkey, transitions in 1986-1990 were at 01:00 standard time
758    not at 02:00, and the spring 1994 transition was on March 20, not
759    March 27.  (Thanks to Kıvanç Yazan.)
760
761  Changes to past and future time zone abbreviations
762
763    Asia/Colombo now uses numeric time zone abbreviations like "+0530"
764    instead of alphabetic ones like "IST" and "LKT".  Various
765    English-language sources use "IST", "LKT" and "SLST", with no
766    working consensus.  (Usage of "SLST" mentioned by Sadika
767    Sumanapala.)
768
769  Changes to code
770
771    zic no longer mishandles relativizing file names when creating
772    symbolic links like /etc/localtime, when these symbolic links
773    are outside the usual directory hierarchy.  This fixes a bug
774    introduced in 2016g.  (Problem reported by Andreas Stieger.)
775
776  Changes to build procedure
777
778    New rules 'traditional_tarballs' and 'traditional_signatures' for
779    building just the traditional-format distribution.  (Requested by
780    Deborah Goldsmith.)
781
782    The file 'version' is now put into the tzdata tarball too.
783    (Requested by Howard Hinnant.)
784
785  Changes to documentation and commentary
786
787    The 'Theory' file now has a section on interface stability.
788    (Requested by Paul Koning.)  It also mentions features like
789    tm_zone and localtime_rz that have long been supported by the
790    reference code.
791
792    tz-link.htm has improved coverage of time zone boundaries suitable
793    for geolocation.  (Thanks to heads-ups from Evan Siroky and Matt
794    Johnson.)
795
796    The US commentary now mentions Allen and the "day of two noons".
797
798    The Fiji commentary mentions the government's 2016-10-03 press
799    release.  (Thanks to Raymond Kumar.)
800
801
802Release 2016g - 2016-09-13 08:56:38 -0700
803
804  Changes to future time stamps
805
806    Turkey switched from EET/EEST (+02/+03) to permanent +03,
807    effective 2016-09-07.  (Thanks to Burak AYDIN.)  Use "+03" rather
808    than an invented abbreviation for the new time.
809
810    New leap second 2016-12-31 23:59:60 UTC as per IERS Bulletin C 52.
811    (Thanks to Tim Parenti.)
812
813  Changes to past time stamps
814
815    For America/Los_Angeles, spring-forward transition times have been
816    corrected from 02:00 to 02:01 in 1948, and from 02:00 to 01:00 in
817    1950-1966.
818
819    For zones using Soviet time on 1919-07-01, transitions to UT-based
820    time were at 00:00 UT, not at 02:00 local time.  The affected
821    zones are Europe/Kirov, Europe/Moscow, Europe/Samara, and
822    Europe/Ulyanovsk.  (Thanks to Alexander Belopolsky.)
823
824  Changes to past and future time zone abbreviations
825
826    The Factory zone now uses the time zone abbreviation -00 instead
827    of a long English-language string, as -00 is now the normal way to
828    represent an undefined time zone.
829
830    Several zones in Antarctica and the former Soviet Union, along
831    with zones intended for ships at sea that cannot use POSIX TZ
832    strings, now use numeric time zone abbreviations instead of
833    invented or obsolete alphanumeric abbreviations.  The affected
834    zones are Antarctica/Casey, Antarctica/Davis,
835    Antarctica/DumontDUrville, Antarctica/Mawson, Antarctica/Rothera,
836    Antarctica/Syowa, Antarctica/Troll, Antarctica/Vostok,
837    Asia/Anadyr, Asia/Ashgabat, Asia/Baku, Asia/Bishkek, Asia/Chita,
838    Asia/Dushanbe, Asia/Irkutsk, Asia/Kamchatka, Asia/Khandyga,
839    Asia/Krasnoyarsk, Asia/Magadan, Asia/Omsk, Asia/Sakhalin,
840    Asia/Samarkand, Asia/Srednekolymsk, Asia/Tashkent, Asia/Tbilisi,
841    Asia/Ust-Nera, Asia/Vladivostok, Asia/Yakutsk, Asia/Yekaterinburg,
842    Asia/Yerevan, Etc/GMT-14, Etc/GMT-13, Etc/GMT-12, Etc/GMT-11,
843    Etc/GMT-10, Etc/GMT-9, Etc/GMT-8, Etc/GMT-7, Etc/GMT-6, Etc/GMT-5,
844    Etc/GMT-4, Etc/GMT-3, Etc/GMT-2, Etc/GMT-1, Etc/GMT+1, Etc/GMT+2,
845    Etc/GMT+3, Etc/GMT+4, Etc/GMT+5, Etc/GMT+6, Etc/GMT+7, Etc/GMT+8,
846    Etc/GMT+9, Etc/GMT+10, Etc/GMT+11, Etc/GMT+12, Europe/Kaliningrad,
847    Europe/Minsk, Europe/Samara, Europe/Volgograd, and
848    Indian/Kerguelen.  For Europe/Moscow the invented abbreviation MSM
849    was replaced by +05, whereas MSK and MSD were kept as they are not
850    our invention and are widely used.
851
852  Changes to zone names
853
854    Rename Asia/Rangoon to Asia/Yangon, with a backward compatibility link.
855    (Thanks to David Massoud.)
856
857  Changes to code
858
859    zic no longer generates binary files containing POSIX TZ-like
860    strings that disagree with the local time type after the last
861    explicit transition in the data.  This fixes a bug with
862    Africa/Casablanca and Africa/El_Aaiun in some year-2037 time
863    stamps on the reference platform.  (Thanks to Alexander Belopolsky
864    for reporting the bug and suggesting a way forward.)
865
866    If the installed localtime and/or posixrules files are symbolic
867    links, zic now keeps them symbolic links when updating them, for
868    compatibility with platforms like OpenSUSE where other programs
869    configure these files as symlinks.
870
871    zic now avoids hard linking to symbolic links, avoids some
872    unnecessary mkdir and stat system calls, and uses shorter file
873    names internally.
874
875    zdump has a new -i option to generate transitions in a
876    more-compact but still human-readable format.  This option is
877    experimental, and the output format may change in future versions.
878    (Thanks to Jon Skeet for suggesting that an option was needed,
879    and thanks to Tim Parenti and Chris Rovick for further comments.)
880
881  Changes to build procedure
882
883    An experimental distribution format is available, in addition
884    to the traditional format which will continue to be distributed.
885    The new format is a tarball tzdb-VERSION.tar.lz with signature
886    file tzdb-VERSION.tar.lz.asc.  It unpacks to a top-level directory
887    tzdb-VERSION containing the code and data of the traditional
888    two-tarball format, along with extra data that may be useful.
889    (Thanks to Antonio Diaz Diaz, Oscar van Vlijmen, and many others
890    for comments about the experimental format.)
891
892    The release version number is now more accurate in the usual case
893    where releases are built from a Git repository.  For example, if
894    23 commits and some working-file changes have been made since
895    release 2016g, the version number is now something like
896    '2016g-23-g50556e3-dirty' instead of the misleading '2016g'.
897    Tagged releases use the same version number format as before,
898    e.g., '2016g'.  To support the more-accurate version number, its
899    specification has moved from a line in the Makefile to a new
900    source file 'version'.
901
902    The experimental distribution contains a file to2050.tzs that
903    contains what should be the output of 'zdump -i -c 2050' on
904    primary zones.  If this file is available, 'make check' now checks
905    that zdump generates this output.
906
907    'make check_web' now works on Fedora-like distributions.
908
909  Changes to documentation and commentary
910
911    tzfile.5 now documents the new restriction on POSIX TZ-like
912    strings that is now implemented by zic.
913
914    Comments now cite URLs for some 1917-1921 Russian DST decrees.
915    (Thanks to Alexander Belopolsky.)
916
917    tz-link.htm mentions JuliaTime (thanks to Curtis Vogt) and Time4J
918    (thanks to Meno Hochschild) and ThreeTen-Extra, and its
919    description of Java 8 has been brought up to date (thanks to
920    Stephen Colebourne).  Its description of local time on Mars has
921    been updated to match current practice, and URLs have been updated
922    and some obsolete ones removed.
923
924
925Release 2016f - 2016-07-05 16:26:51 +0200
926
927  Changes affecting future time stamps
928
929    The Egyptian government changed its mind on short notice, and
930    Africa/Cairo will not introduce DST starting 2016-07-07 after all.
931    (Thanks to Mina Samuel.)
932
933    Asia/Novosibirsk switches from +06 to +07 on 2016-07-24 at 02:00.
934    (Thanks to Stepan Golosunov.)
935
936  Changes to past and future time stamps
937
938    Asia/Novokuznetsk and Asia/Novosibirsk now use numeric time zone
939    abbreviations instead of invented ones.
940
941  Changes affecting past time stamps
942
943    Europe/Minsk's 1992-03-29 spring-forward transition was at 02:00 not 00:00.
944    (Thanks to Stepan Golosunov.)
945
946
947Release 2016e - 2016-06-14 08:46:16 -0700
948
949  Changes affecting future time stamps
950
951    Africa/Cairo observes DST in 2016 from July 7 to the end of October.
952    Guess October 27 and 24:00 transitions.  (Thanks to Steffen Thorsen.)
953    For future years, guess April's last Thursday to October's last
954    Thursday except for Ramadan.
955
956  Changes affecting past time stamps
957
958    Locations while uninhabited now use '-00', not 'zzz', as a
959    placeholder time zone abbreviation.  This is inspired by Internet
960    RFC 3339 and is more consistent with numeric time zone
961    abbreviations already used elsewhere.  The change affects several
962    arctic and antarctic locations, e.g., America/Cambridge_Bay before
963    1920 and Antarctica/Troll before 2005.
964
965    Asia/Baku's 1992-09-27 transition from +04 (DST) to +04 (non-DST) was
966    at 03:00, not 23:00 the previous day.  (Thanks to Michael Deckers.)
967
968  Changes to code
969
970    zic now outputs a dummy transition at time 2**31 - 1 in zones
971    whose POSIX-style TZ strings contain a '<'.  This mostly works
972    around Qt bug 53071 <https://bugreports.qt.io/browse/QTBUG-53071>.
973    (Thanks to Zhanibek Adilbekov for reporting the Qt bug.)
974
975  Changes affecting documentation and commentary
976
977    tz-link.htm says why governments should give plenty of notice for
978    time zone or DST changes, and refers to Matt Johnson's blog post.
979
980    tz-link.htm mentions Tzdata for Elixir.  (Thanks to Matt Johnson.)
981
982
983Release 2016d - 2016-04-17 22:50:29 -0700
984
985  Changes affecting future time stamps
986
987    America/Caracas switches from -0430 to -04 on 2016-05-01 at 02:30.
988    (Thanks to Alexander Krivenyshev for the heads-up.)
989
990    Asia/Magadan switches from +10 to +11 on 2016-04-24 at 02:00.
991    (Thanks to Alexander Krivenyshev and Matt Johnson.)
992
993    New zone Asia/Tomsk, split off from Asia/Novosibirsk.  It covers
994    Tomsk Oblast, Russia, which switches from +06 to +07 on 2016-05-29
995    at 02:00.  (Thanks to Stepan Golosunov.)
996
997  Changes affecting past time stamps
998
999    New zone Europe/Kirov, split off from Europe/Volgograd.  It covers
1000    Kirov Oblast, Russia, which switched from +04/+05 to +03/+04 on
1001    1989-03-26 at 02:00, roughly a year after Europe/Volgograd made
1002    the same change.  (Thanks to Stepan Golosunov.)
1003
1004    Russia and nearby locations had daylight-saving transitions on
1005    1992-03-29 at 02:00 and 1992-09-27 at 03:00, instead of on
1006    1992-03-28 at 23:00 and 1992-09-26 at 23:00.  (Thanks to Stepan
1007    Golosunov.)
1008
1009    Many corrections to historical time in Kazakhstan from 1991
1010    through 2005.  (Thanks to Stepan Golosunov.)  Replace Kazakhstan's
1011    invented time zone abbreviations with numeric abbreviations.
1012
1013  Changes to commentary
1014
1015    Mention Internet RFCs 7808 (TZDIST) and 7809 (CalDAV time zone references).
1016
1017
1018Release 2016c - 2016-03-23 00:51:27 -0700
1019
1020  Changes affecting future time stamps
1021
1022    Azerbaijan no longer observes DST.  (Thanks to Steffen Thorsen.)
1023
1024    Chile reverts from permanent to seasonal DST.  (Thanks to Juan
1025    Correa for the heads-up, and to Tim Parenti for corrections.)
1026    Guess that future transitions are August's and May's second
1027    Saturdays at 24:00 mainland time.  Also, call the period from
1028    2014-09-07 through 2016-05-14 daylight saving time instead of
1029    standard time, as that seems more appropriate now.
1030
1031  Changes affecting past time stamps
1032
1033    Europe/Kaliningrad and Europe/Vilnius changed from +03/+04 to
1034    +02/+03 on 1989-03-26, not 1991-03-31.  Europe/Volgograd changed
1035    from +04/+05 to +03/+04 on 1988-03-27, not 1989-03-26.
1036    (Thanks to Stepan Golosunov.)
1037
1038  Changes to commentary
1039
1040    Several updates and URLs for historical and proposed Russian changes.
1041    (Thanks to Stepan Golosunov, Matt Johnson, and Alexander Krivenyshev.)
1042
1043
1044Release 2016b - 2016-03-12 17:30:14 -0800
1045
1046  Compatibility note
1047
1048    Starting with release 2016b, some data entries cause zic implementations
1049    derived from tz releases 2005j through 2015e to issue warnings like
1050    "time zone abbreviation differs from POSIX standard (+03)".
1051    These warnings should not otherwise affect zic's output and can safely be
1052    ignored on today's platforms, as the warnings refer to a restriction in
1053    POSIX.1-1988 that was removed in POSIX.1-2001.  One way to suppress the
1054    warnings is to upgrade to zic derived from tz releases 2015f and later.
1055
1056  Changes affecting future time stamps
1057
1058    New zones Europe/Astrakhan and Europe/Ulyanovsk for Astrakhan and
1059    Ulyanovsk Oblasts, Russia, both of which will switch from +03 to +04 on
1060    2016-03-27 at 02:00 local time.  They need distinct zones since their
1061    post-1970 histories disagree.  New zone Asia/Barnaul for Altai Krai and
1062    Altai Republic, Russia, which will switch from +06 to +07 on the same date
1063    and local time.  The Astrakhan change is already official; the others have
1064    passed the first reading in the State Duma and are extremely likely.
1065    Also, Asia/Sakhalin moves from +10 to +11 on 2016-03-27 at 02:00.
1066    (Thanks to Alexander Krivenyshev for the heads-up, and to Matt Johnson
1067    and Stepan Golosunov for followup.)
1068
1069    As a trial of a new system that needs less information to be made up,
1070    the new zones use numeric time zone abbreviations like "+04"
1071    instead of invented abbreviations like "ASTT".
1072
1073    Haiti will not observe DST in 2016.  (Thanks to Jean Antoine via
1074    Steffen Thorsen.)
1075
1076    Palestine's spring-forward transition on 2016-03-26 is at 01:00, not 00:00.
1077    (Thanks to Hannah Kreitem.) Guess future transitions will be March's last
1078    Saturday at 01:00, not March's last Friday at 24:00.
1079
1080  Changes affecting past time stamps
1081
1082    Europe/Chisinau observed DST during 1990, and switched from +04 to
1083    +03 at 1990-05-06 02:00, instead of switching from +03 to +02.
1084    (Thanks to Stepan Golosunov.)
1085
1086    1991 abbreviations in Europe/Samara should be SAMT/SAMST, not
1087    KUYT/KUYST.  (Thanks to Stepan Golosunov.)
1088
1089  Changes to code
1090
1091    tzselect's diagnostics and checking, and checktab.awk's checking,
1092    have been improved.  (Thanks to J William Piggott.)
1093
1094    tzcode now builds under MinGW.  (Thanks to Ian Abbott and Esben Haabendal.)
1095
1096    tzselect now tests Julian-date TZ settings more accurately.
1097    (Thanks to J William Piggott.)
1098
1099  Changes to commentary
1100
1101    Comments in zone tables have been improved.  (Thanks to J William Piggott.)
1102
1103    tzselect again limits its menu comments so that menus fit on a
1104    24×80 alphanumeric display.
1105
1106    A new web page tz-how-to.html.  (Thanks to Bill Seymour.)
1107
1108    In the Theory file, the description of possible time zone abbreviations in
1109    tzdata has been cleaned up, as the old description was unclear and
1110    inconsistent.  (Thanks to Alain Mouette for reporting the problem.)
1111
1112
1113Release 2016a - 2016-01-26 23:28:02 -0800
1114
1115  Changes affecting future time stamps
1116
1117    America/Cayman will not observe daylight saving this year after all.
1118    Revert our guess that it would.  (Thanks to Matt Johnson.)
1119
1120    Asia/Chita switches from +0800 to +0900 on 2016-03-27 at 02:00.
1121    (Thanks to Alexander Krivenyshev.)
1122
1123    Asia/Tehran now has DST predictions for the year 2038 and later,
1124    to be March 21 00:00 to September 21 00:00.  This is likely better
1125    than predicting no DST, albeit off by a day every now and then.
1126
1127  Changes affecting past and future time stamps
1128
1129    America/Metlakatla switched from PST all year to AKST/AKDT on
1130    2015-11-01 at 02:00.  (Thanks to Steffen Thorsen.)
1131
1132    America/Santa_Isabel has been removed, and replaced with a
1133    backward compatibility link to America/Tijuana.  Its contents were
1134    apparently based on a misreading of Mexican legislation.
1135
1136  Changes affecting past time stamps
1137
1138    Asia/Karachi's two transition times in 2002 were off by a minute.
1139    (Thanks to Matt Johnson.)
1140
1141  Changes affecting build procedure
1142
1143    An installer can now combine leap seconds with use of the backzone file,
1144    e.g., with 'make PACKRATDATA=backzone REDO=posix_right zones'.
1145    The old 'make posix_packrat' rule is now marked as obsolescent.
1146    (Thanks to Ian Abbott for an initial implementation.)
1147
1148  Changes affecting documentation and commentary
1149
1150    A new file LICENSE makes it easier to see that the code and data
1151    are mostly public-domain.  (Thanks to James Knight.)  The three
1152    non-public-domain files now use the current (3-clause) BSD license
1153    instead of older versions of that license.
1154
1155    tz-link.htm mentions the BDE library (thanks to Andrew Paprocki),
1156    CCTZ (thanks to Tim Parenti), TimeJones.com, and has a new section
1157    on editing tz source files (with a mention of Sublime zoneinfo,
1158    thanks to Gilmore Davidson).
1159
1160    The Theory and asia files now mention the 2015 book "The Global
1161    Transformation of Time, 1870-1950", and cite a couple of reviews.
1162
1163    The America/Chicago entry now documents the informal use of US
1164    central time in Fort Pierre, South Dakota.  (Thanks to Rick
1165    McDermid, Matt Johnson, and Steve Jones.)
1166
1167
1168Release 2015g - 2015-10-01 00:39:51 -0700
1169
1170  Changes affecting future time stamps
1171
1172    Turkey's 2015 fall-back transition is scheduled for Nov. 8, not Oct. 25.
1173    (Thanks to Fatih.)
1174
1175    Norfolk moves from +1130 to +1100 on 2015-10-04 at 02:00 local time.
1176    (Thanks to Alexander Krivenyshev.)
1177
1178    Fiji's 2016 fall-back transition is scheduled for January 17, not 24.
1179    (Thanks to Ken Rylander.)
1180
1181    Fort Nelson, British Columbia will not fall back on 2015-11-01.  It has
1182    effectively been on MST (-0700) since it advanced its clocks on 2015-03-08.
1183    New zone America/Fort_Nelson.  (Thanks to Matt Johnson.)
1184
1185  Changes affecting past time stamps
1186
1187    Norfolk observed DST from 1974-10-27 02:00 to 1975-03-02 02:00.
1188
1189  Changes affecting code
1190
1191    localtime no longer mishandles America/Anchorage after 2037.
1192    (Thanks to Bradley White for reporting the bug.)
1193
1194    On hosts with signed 32-bit time_t, localtime no longer mishandles
1195    Pacific/Fiji after 2038-01-16 14:00 UTC.
1196
1197    The localtime module allows the variables 'timezone', 'daylight',
1198    and 'altzone' to be in common storage shared with other modules,
1199    and declares them in case the system <time.h> does not.
1200    (Problems reported by Kees Dekker.)
1201
1202    On platforms with tm_zone, strftime.c now assumes it is not NULL.
1203    This simplifies the code and is consistent with zdump.c.
1204    (Problem reported by Christos Zoulas.)
1205
1206  Changes affecting documentation
1207
1208   The tzfile man page now documents that transition times denote the
1209   starts (not the ends) of the corresponding time periods.
1210   (Ambiguity reported by Bill Seymour.)
1211
1212
1213Release 2015f - 2015-08-10 18:06:56 -0700
1214
1215  Changes affecting future time stamps
1216
1217    North Korea switches to +0830 on 2015-08-15.  (Thanks to Steffen Thorsen.)
1218    The abbreviation remains "KST".  (Thanks to Robert Elz.)
1219
1220    Uruguay no longer observes DST.  (Thanks to Steffen Thorsen
1221    and Pablo Camargo.)
1222
1223  Changes affecting past and future time stamps
1224
1225    Moldova starts and ends DST at 00:00 UTC, not at 01:00 UTC.
1226    (Thanks to Roman Tudos.)
1227
1228  Changes affecting data format and code
1229
1230    zic's '-y YEARISTYPE' option is no longer documented.  The TYPE
1231    field of a Rule line should now be '-'; the old values 'even',
1232    'odd', 'uspres', 'nonpres', 'nonuspres' were already undocumented.
1233    Although the implementation has not changed, these features do not
1234    work in the default installation, they are not used in the data,
1235    and they are now considered obsolescent.
1236
1237    zic now checks that two rules don't take effect at the same time.
1238    (Thanks to Jon Skeet and Arthur David Olson.)  Constraints on
1239    simultaneity are now documented.
1240
1241    The two characters '%z' in a zone format now stand for the UT
1242    offset, e.g., '-07' for seven hours behind UT and '+0530' for
1243    five hours and thirty minutes ahead.  This better supports time
1244    zone abbreviations conforming to POSIX.1-2001 and later.
1245
1246  Changes affecting installed data files
1247
1248    Comments for America/Halifax and America/Glace_Bay have been improved.
1249    (Thanks to Brian Inglis.)
1250
1251    Data entries have been simplified for Atlantic/Canary, Europe/Simferopol,
1252    Europe/Sofia, and Europe/Tallinn.  This yields slightly smaller
1253    installed data files for Europe/Simferopol and Europe/Tallinn.
1254    It does not affect timestamps.  (Thanks to Howard Hinnant.)
1255
1256  Changes affecting code
1257
1258    zdump and zic no longer warn about valid time zone abbreviations
1259    like '-05'.
1260
1261    Some Visual Studio 2013 warnings have been suppressed.
1262    (Thanks to Kees Dekker.)
1263
1264    'date' no longer sets the time of day and its -a, -d, -n and -t
1265    options have been removed.  Long obsolescent, the implementation
1266    of these features had porting problems.  Builders no longer need
1267    to configure HAVE_ADJTIME, HAVE_SETTIMEOFDAY, or HAVE_UTMPX_H.
1268    (Thanks to Kees Dekker for pointing out the problem.)
1269
1270  Changes affecting documentation
1271
1272    The Theory file mentions naming issues earlier, as these seem to be
1273    poorly publicized (thanks to Gilmore Davidson for reporting the problem).
1274
1275    tz-link.htm mentions Time Zone Database Parser (thanks to Howard Hinnant).
1276
1277    Mention that Herbert Samuel introduced the term "Summer Time".
1278
1279
1280Release 2015e - 2015-06-13 10:56:02 -0700
1281
1282  Changes affecting future time stamps
1283
1284    Morocco will suspend DST from 2015-06-14 03:00 through 2015-07-19 02:00,
1285    not 06-13 and 07-18 as we had guessed.  (Thanks to Milamber.)
1286
1287    Assume Cayman Islands will observe DST starting next year, using US rules.
1288    Although it isn't guaranteed, it is the most likely.
1289
1290  Changes affecting data format
1291
1292    The file 'iso3166.tab' now uses UTF-8, so that its entries can better
1293    spell the names of Åland Islands, Côte d'Ivoire, and Réunion.
1294
1295  Changes affecting code
1296
1297    When displaying data, tzselect converts it to the current locale's
1298    encoding if the iconv command works.  (Problem reported by random832.)
1299
1300    tzselect no longer mishandles Dominica, fixing a bug introduced
1301    in Release 2014f.  (Problem reported by Owen Leibman.)
1302
1303    zic -l no longer fails when compiled with -DTZDEFAULT=\"/etc/localtime\".
1304    This fixes a bug introduced in Release 2014f.
1305    (Problem reported by Leonardo Chiquitto.)
1306
1307
1308Release 2015d - 2015-04-24 08:09:46 -0700
1309
1310  Changes affecting future time stamps
1311
1312    Egypt will not observe DST in 2015 and will consider canceling it
1313    permanently.  For now, assume no DST indefinitely.
1314    (Thanks to Ahmed Nazmy and Tim Parenti.)
1315
1316  Changes affecting past time stamps
1317
1318    America/Whitehorse switched from UT -09 to -08 on 1967-05-28, not
1319    1966-07-01.  Also, Yukon's time zone history is documented better.
1320    (Thanks to Brian Inglis and Dennis Ferguson.)
1321
1322  Change affecting past and future time zone abbreviations
1323
1324    The abbreviations for Hawaii-Aleutian standard and daylight times
1325    have been changed from HAST/HADT to HST/HDT, as per US Government
1326    Printing Office style.  This affects only America/Adak since 1983,
1327    as America/Honolulu was already using the new style.
1328
1329  Changes affecting code
1330
1331   zic has some minor performance improvements.
1332
1333
1334Release 2015c - 2015-04-11 08:55:55 -0700
1335
1336  Changes affecting future time stamps
1337
1338    Egypt's spring-forward transition is at 24:00 on April's last Thursday,
1339    not 00:00 on April's last Friday.  2015's transition will therefore be on
1340    Thursday, April 30 at 24:00, not Friday, April 24 at 00:00.  Similar fixes
1341    apply to 2026, 2037, 2043, etc.  (Thanks to Steffen Thorsen.)
1342
1343  Changes affecting past time stamps
1344
1345    The following changes affect some pre-1991 Chile-related time stamps
1346    in America/Santiago, Antarctica/Palmer, and Pacific/Easter.
1347
1348      The 1910 transition was January 10, not January 1.
1349
1350      The 1918 transition was September 10, not September 1.
1351
1352      The UT -04 time observed from 1932 to 1942 is now considered to
1353      be standard time, not year-round DST.
1354
1355      Santiago observed DST (UT -03) from 1946-07-15 through
1356      1946-08-31, then reverted to standard time, then switched to -05
1357      on 1947-04-01.
1358
1359      Assume transitions before 1968 were at 00:00, since we have no data
1360      saying otherwise.
1361
1362      The spring 1988 transition was 1988-10-09, not 1988-10-02.
1363      The fall 1990 transition was 1990-03-11, not 1990-03-18.
1364
1365      Assume no UT offset change for Pacific/Easter on 1890-01-01,
1366      and omit all transitions on Pacific/Easter from 1942 through 1946
1367      since we have no data suggesting that they existed.
1368
1369    One more zone has been turned into a link, as it differed
1370    from an existing zone only for older time stamps.  As usual,
1371    this change affects UT offsets in pre-1970 time stamps only.
1372    The zone's old contents have been moved to the 'backzone' file.
1373    The affected zone is America/Montreal.
1374
1375  Changes affecting commentary
1376
1377    Mention the TZUpdater tool.
1378
1379    Mention "The Time Now".  (Thanks to Brandon Ramsey.)
1380
1381
1382Release 2015b - 2015-03-19 23:28:11 -0700
1383
1384  Changes affecting future time stamps
1385
1386    Mongolia will start observing DST again this year, from the last
1387    Saturday in March at 02:00 to the last Saturday in September at 00:00.
1388    (Thanks to Ganbold Tsagaankhuu.)
1389
1390    Palestine will start DST on March 28, not March 27.  Also,
1391    correct the fall 2014 transition from September 26 to October 24.
1392    Adjust future predictions accordingly.  (Thanks to Steffen Thorsen.)
1393
1394  Changes affecting past time stamps
1395
1396    The 1982 zone shift in Pacific/Easter has been corrected, fixing a 2015a
1397    regression.  (Thanks to Stuart Bishop for reporting the problem.)
1398
1399    Some more zones have been turned into links, when they differed
1400    from existing zones only for older time stamps.  As usual,
1401    these changes affect UT offsets in pre-1970 time stamps only.
1402    Their old contents have been moved to the 'backzone' file.
1403    The affected zones are: America/Antigua, America/Cayman,
1404    Pacific/Midway, and Pacific/Saipan.
1405
1406  Changes affecting time zone abbreviations
1407
1408    Correct the 1992-2010 DST abbreviation in Volgograd from "MSK" to "MSD".
1409    (Thanks to Hank W.)
1410
1411  Changes affecting code
1412
1413    Fix integer overflow bug in reference 'mktime' implementation.
1414    (Problem reported by Jörg Richter.)
1415
1416    Allow -Dtime_tz=time_t compilations, and allow -Dtime_tz=... libraries
1417    to be used in the same executable as standard-library time_t functions.
1418    (Problems reported by Bradley White.)
1419
1420  Changes affecting commentary
1421
1422    Cite the recent Mexican decree changing Quintana Roo's time zone.
1423    (Thanks to Carlos Raúl Perasso.)
1424
1425    Likewise for the recent Chilean decree.  (Thanks to Eduardo Romero Urra.)
1426
1427    Update info about Mars time.
1428
1429
1430Release 2015a - 2015-01-29 22:35:20 -0800
1431
1432  Changes affecting future time stamps
1433
1434    The Mexican state of Quintana Roo, represented by America/Cancun,
1435    will shift from Central Time with DST to Eastern Time without DST
1436    on 2015-02-01 at 02:00.  (Thanks to Steffen Thorsen and Gwillim Law.)
1437
1438    Chile will not change clocks in April or thereafter; its new standard time
1439    will be its old daylight saving time.  This affects America/Santiago,
1440    Pacific/Easter, and Antarctica/Palmer.  (Thanks to Juan Correa.)
1441
1442    New leap second 2015-06-30 23:59:60 UTC as per IERS Bulletin C 49.
1443    (Thanks to Tim Parenti.)
1444
1445  Changes affecting past time stamps
1446
1447    Iceland observed DST in 1919 and 1921, and its 1939 fallback
1448    transition was Oct. 29, not Nov. 29.  Remove incorrect data from
1449    Shanks about time in Iceland between 1837 and 1908.
1450
1451    Some more zones have been turned into links, when they differed
1452    from existing zones only for older time stamps.  As usual,
1453    these changes affect UT offsets in pre-1970 time stamps only.
1454    Their old contents have been moved to the 'backzone' file.
1455    The affected zones are: Asia/Aden, Asia/Bahrain, Asia/Kuwait,
1456    and Asia/Muscat.
1457
1458  Changes affecting code
1459
1460    tzalloc now scrubs time zone abbreviations compatibly with the way
1461    that tzset always has, by replacing invalid bytes with '_' and by
1462    shortening too-long abbreviations.
1463
1464    tzselect ports to POSIX awk implementations, no longer mishandles
1465    POSIX TZ settings when GNU awk is used, and reports POSIX TZ
1466    settings to the user.  (Thanks to Stefan Kuhn.)
1467
1468  Changes affecting build procedure
1469
1470    'make check' now checks for links to links in the data.
1471    One such link (for Africa/Asmera) has been fixed.
1472    (Thanks to Stephen Colebourne for pointing out the problem.)
1473
1474  Changes affecting commentary
1475
1476    The leapseconds file commentary now mentions the expiration date.
1477    (Problem reported by Martin Burnicki.)
1478
1479    Update Mexican Library of Congress URL.
1480
1481
1482Release 2014j - 2014-11-10 17:37:11 -0800
1483
1484  Changes affecting current and future time stamps
1485
1486    Turks & Caicos' switch from US eastern time to UT -04 year-round
1487    did not occur on 2014-11-02 at 02:00.  It's currently scheduled
1488    for 2015-11-01 at 02:00.  (Thanks to Chris Walton.)
1489
1490  Changes affecting past time stamps
1491
1492    Many pre-1989 time stamps have been corrected for Asia/Seoul and
1493    Asia/Pyongyang, based on sources for the Korean-language Wikipedia
1494    entry for time in Korea.  (Thanks to Sanghyuk Jung.)  Also, no
1495    longer guess that Pyongyang mimicked Seoul time after World War II,
1496    as this is politically implausible.
1497
1498    Some more zones have been turned into links, when they differed
1499    from existing zones only for older time stamps.  As usual,
1500    these changes affect UT offsets in pre-1970 time stamps only.
1501    Their old contents have been moved to the 'backzone' file.
1502    The affected zones are: Africa/Addis_Ababa, Africa/Asmara,
1503    Africa/Dar_es_Salaam, Africa/Djibouti, Africa/Kampala,
1504    Africa/Mogadishu, Indian/Antananarivo, Indian/Comoro, and
1505    Indian/Mayotte.
1506
1507  Changes affecting commentary
1508
1509    The commentary is less enthusiastic about Shanks as a source,
1510    and is more careful to distinguish UT from UTC.
1511
1512
1513Release 2014i - 2014-10-21 22:04:57 -0700
1514
1515  Changes affecting future time stamps
1516
1517    Pacific/Fiji will observe DST from 2014-11-02 02:00 to 2015-01-18 03:00.
1518    (Thanks to Ken Rylander for the heads-up.)  Guess that future
1519    years will use a similar pattern.
1520
1521    A new Zone Pacific/Bougainville, for the part of Papua New Guinea
1522    that plans to switch from UT +10 to +11 on 2014-12-28 at 02:00.
1523    (Thanks to Kiley Walbom for the heads-up.)
1524
1525  Changes affecting time zone abbreviations
1526
1527    Since Belarus is not changing its clocks even though Moscow is,
1528    the time zone abbreviation in Europe/Minsk is changing from FET
1529    to its more-traditional value MSK on 2014-10-26 at 01:00.
1530    (Thanks to Alexander Bokovoy for the heads-up about Belarus.)
1531
1532    The new abbreviation IDT stands for the pre-1976 use of UT +08 in
1533    Indochina, to distinguish it better from ICT (+07).
1534
1535  Changes affecting past time stamps
1536
1537    Many time stamps have been corrected for Asia/Ho_Chi_Minh before 1976
1538    (thanks to Trần Ngọc Quân for an indirect pointer to Trần Tiến Bình's
1539    authoritative book).  Asia/Ho_Chi_Minh has been added to
1540    zone1970.tab, to give tzselect users in Vietnam two choices,
1541    since north and south Vietnam disagreed after our 1970 cutoff.
1542
1543    Asia/Phnom_Penh and Asia/Vientiane have been turned into links, as
1544    they differed from existing zones only for older time stamps.  As
1545    usual, these changes affect pre-1970 time stamps only.  Their old
1546    contents have been moved to the 'backzone' file.
1547
1548  Changes affecting code
1549
1550    The time-related library functions now set errno on failure, and
1551    some crashes in the new tzalloc-related library functions have
1552    been fixed.  (Thanks to Christos Zoulas for reporting most of
1553    these problems and for suggesting fixes.)
1554
1555    If USG_COMPAT is defined and the requested timestamp is standard time,
1556    the tz library's localtime and mktime functions now set the extern
1557    variable timezone to a value appropriate for that timestamp; and
1558    similarly for ALTZONE, daylight saving time, and the altzone variable.
1559    This change is a companion to the tzname change in 2014h, and is
1560    designed to make timezone and altzone more compatible with tzname.
1561
1562    The tz library's functions now set errno to EOVERFLOW if they fail
1563    because the result cannot be represented.  ctime and ctime_r now
1564    return NULL and set errno when a timestamp is out of range, rather
1565    than having undefined behavior.
1566
1567    Some bugs associated with the new 2014g functions have been fixed.
1568    This includes a bug that largely incapacitated the new functions
1569    time2posix_z and posix2time_z.  (Thanks to Christos Zoulas.)
1570    It also includes some uses of uninitialized variables after tzalloc.
1571    The new code uses the standard type 'ssize_t', which the Makefile
1572    now gives porting advice about.
1573
1574  Changes affecting commentary
1575
1576    Updated URLs for NRC Canada (thanks to Matt Johnson and Brian Inglis).
1577
1578
1579Release 2014h - 2014-09-25 18:59:03 -0700
1580
1581  Changes affecting past timestamps
1582
1583    America/Jamaica's 1974 spring-forward transition was Jan. 6, not Apr. 28.
1584
1585    Shanks says Asia/Novokuznetsk switched from LMT (not "NMT") on 1924-05-01,
1586    not 1920-01-06.  The old entry was based on a misinterpretation of Shanks.
1587
1588    Some more zones have been turned into links, when they differed
1589    from existing zones only for older timestamps.  As usual,
1590    these changes affect UT offsets in pre-1970 timestamps only.
1591    Their old contents have been moved to the 'backzone' file.
1592    The affected zones are: Africa/Blantyre, Africa/Bujumbura,
1593    Africa/Gaborone, Africa/Harare, Africa/Kigali, Africa/Lubumbashi,
1594    Africa/Lusaka, Africa/Maseru, and Africa/Mbabane.
1595
1596  Changes affecting code
1597
1598    zdump -V and -v now output gmtoff= values on all platforms,
1599    not merely on platforms defining TM_GMTOFF.
1600
1601    The tz library's localtime and mktime functions now set tzname to a value
1602    appropriate for the requested timestamp, and zdump now uses this
1603    on platforms not defining TM_ZONE, fixing a 2014g regression.
1604    (Thanks to Tim Parenti for reporting the problem.)
1605
1606    The tz library no longer sets tzname if localtime or mktime fails.
1607
1608    zdump -c no longer mishandles transitions near year boundaries.
1609    (Thanks to Tim Parenti for reporting the problem.)
1610
1611    An access to uninitialized data has been fixed.
1612    (Thanks to Jörg Richter for reporting the problem.)
1613
1614    When THREAD_SAFE is defined, the code ports to the C11 memory model.
1615    A memory leak has been fixed if ALL_STATE and THREAD_SAFE are defined
1616    and two threads race to initialize data used by gmtime-like functions.
1617    (Thanks to Andy Heninger for reporting the problems.)
1618
1619  Changes affecting build procedure
1620
1621    'make check' now checks better for properly-sorted data.
1622
1623  Changes affecting documentation and commentary
1624
1625    zdump's gmtoff=N output is now documented, and its isdst=D output
1626    is now documented to possibly output D values other than 0 or 1.
1627
1628    zdump -c's treatment of years is now documented to use the
1629    Gregorian calendar and Universal Time without leap seconds,
1630    and its behavior at cutoff boundaries is now documented better.
1631    (Thanks to Arthur David Olson and Tim Parenti for reporting the problems.)
1632
1633    Programs are now documented to use the proleptic Gregorian calendar.
1634    (Thanks to Alan Barrett for the suggestion.)
1635
1636    Fractional-second GMT offsets have been documented for civil time
1637    in 19th-century Chennai, Jakarta, and New York.
1638
1639
1640Release 2014g - 2014-08-28 12:31:23 -0700
1641
1642  Changes affecting future timestamps
1643
1644    Turks & Caicos is switching from US eastern time to UT -04
1645    year-round, modeled as a switch on 2014-11-02 at 02:00.
1646    [As noted in 2014j, this switch was later delayed.]
1647
1648  Changes affecting past timestamps
1649
1650    Time in Russia or the USSR before 1926 or so has been corrected by
1651    a few seconds in the following zones: Asia/Irkutsk,
1652    Asia/Krasnoyarsk, Asia/Omsk, Asia/Samarkand, Asia/Tbilisi,
1653    Asia/Vladivostok, Asia/Yakutsk, Europe/Riga, Europe/Samara.  For
1654    Asia/Yekaterinburg the correction is a few minutes.  (Thanks to
1655    Vladimir Karpinsky.)
1656
1657    The Portuguese decree of 1911-05-26 took effect on 1912-01-01.
1658    This affects 1911 timestamps in Africa/Bissau, Africa/Luanda,
1659    Atlantic/Azores, and Atlantic/Madeira.  Also, Lisbon's pre-1912
1660    GMT offset was -0:36:45 (rounded from -0:36:44.68), not -0:36:32.
1661    (Thanks to Stephen Colebourne for pointing to the decree.)
1662
1663    Asia/Dhaka ended DST on 2009-12-31 at 24:00, not 23:59.
1664
1665    A new file 'backzone' contains data which may appeal to
1666    connoisseurs of old timestamps, although it is out of scope for
1667    the tz database, is often poorly sourced, and contains some data
1668    that is known to be incorrect.  The new file is not recommended
1669    for ordinary use and its entries are not installed by default.
1670    (Thanks to Lester Caine for the high-quality Jersey, Guernsey, and
1671    Isle of Man entries.)
1672
1673    Some more zones have been turned into links, when they differed
1674    from existing zones only for older timestamps.  As usual,
1675    these changes affect UT offsets in pre-1970 timestamps only.
1676    Their old contents have been moved to the 'backzone' file.
1677    The affected zones are: Africa/Bangui, Africa/Brazzaville,
1678    Africa/Douala, Africa/Kinshasa, Africa/Libreville, Africa/Luanda,
1679    Africa/Malabo, Africa/Niamey, and Africa/Porto-Novo.
1680
1681  Changes affecting code
1682
1683    Unless NETBSD_INSPIRED is defined to 0, the tz library now
1684    supplies functions for creating and using objects that represent
1685    time zones. The new functions are tzalloc, tzfree, localtime_rz,
1686    mktime_z, and (if STD_INSPIRED is also defined) posix2time_z and
1687    time2posix_z.  They are intended for performance: for example,
1688    localtime_rz (unlike localtime_r) is trivially thread-safe without
1689    locking.  (Thanks to Christos Zoulas for proposing NetBSD-inspired
1690    functions, and to Alan Barrett and Jonathan Lennox for helping to
1691    debug the change.)
1692
1693    zdump now builds with the tz library unless USE_LTZ is defined to 0,
1694    This lets zdump use tz features even if the system library lacks them.
1695    To build zdump with the system library, use 'make CFLAGS=-DUSE_LTZ=0
1696    TZDOBJS=zdump.o CHECK_TIME_T_ALTERNATIVES='.
1697
1698    zdump now uses localtime_rz if available, as it's significantly faster,
1699    and it can help zdump better diagnose invalid time zone names.
1700    Define HAVE_LOCALTIME_RZ to 0 to suppress this.  HAVE_LOCALTIME_RZ
1701    defaults to 1 if NETBSD_INSPIRED && USE_LTZ.  When localtime_rz is
1702    not available, zdump now uses localtime_r and tzset if available,
1703    as this is a bit cleaner and faster than plain localtime.  Compile
1704    with -DHAVE_LOCALTIME_R=0 and/or -DHAVE_TZSET=0 if your system
1705    lacks these two functions.
1706
1707    If THREAD_SAFE is defined to 1, the tz library is now thread-safe.
1708    Although not needed for tz's own applications, which are single-threaded,
1709    this supports POSIX better if the tz library is used in multithreaded apps.
1710
1711    Some crashes have been fixed when zdump or the tz library is given
1712    invalid or outlandish input.
1713
1714    The tz library no longer mishandles leap seconds on platforms with
1715    unsigned time_t in time zones that lack ordinary transitions after 1970.
1716
1717    The tz code now attempts to infer TM_GMTOFF and TM_ZONE if not
1718    already defined, to make it easier to configure on common platforms.
1719    Define NO_TM_GMTOFF and NO_TM_ZONE to suppress this.
1720
1721    Unless the new macro UNINIT_TRAP is defined to 1, the tz code now
1722    assumes that reading uninitialized memory yields garbage values
1723    but does not cause other problems such as traps.
1724
1725    If TM_GMTOFF is defined and UNINIT_TRAP is 0, mktime is now
1726    more likely to guess right for ambiguous timestamps near
1727    transitions where tm_isdst does not change.
1728
1729    If HAVE_STRFTIME_L is defined to 1, the tz library now defines
1730    strftime_l for compatibility with recent versions of POSIX.
1731    Only the C locale is supported, though.  HAVE_STRFTIME_L defaults
1732    to 1 on recent POSIX versions, and to 0 otherwise.
1733
1734    tzselect -c now uses a hybrid distance measure that works better
1735    in Africa.  (Thanks to Alan Barrett for noting the problem.)
1736
1737    The C source code now ports to NetBSD when GCC_DEBUG_FLAGS is used,
1738    or when time_tz is defined.
1739
1740    When HAVE_UTMPX_H is set the 'date' command now builds on systems
1741    whose <utmpx.h> file does not define WTMPX_FILE, and when setting
1742    the date it updates the wtmpx file if _PATH_WTMPX is defined.
1743    This affects GNU/Linux and similar systems.
1744
1745    For easier maintenance later, some C code has been simplified,
1746    some lint has been removed, and the code has been tweaked so that
1747    plain 'make' is more likely to work.
1748
1749    The C type 'bool' is now used for boolean values, instead of 'int'.
1750
1751    The long-obsolete LOCALE_HOME code has been removed.
1752
1753    The long-obsolete 'gtime' function has been removed.
1754
1755  Changes affecting build procedure
1756
1757    'zdump' no longer links in ialloc.o, as it's not needed.
1758
1759    'make check_time_t_alternatives' no longer assumes GNU diff.
1760
1761  Changes affecting distribution tarballs
1762
1763    The files checktab.awk and zoneinfo2tdf.pl are now distributed in
1764    the tzdata tarball instead of the tzcode tarball, since they help
1765    maintain the data.  The NEWS and Theory files are now also
1766    distributed in the tzdata tarball, as they're relevant for data.
1767    (Thanks to Alan Barrett for pointing this out.)  Also, the
1768    leapseconds.awk file is no longer distributed in the tzcode
1769    tarball, since it belongs in the tzdata tarball (where 2014f
1770    inadvertently also distributed it).
1771
1772  Changes affecting documentation and commentary
1773
1774    A new file CONTRIBUTING is distributed.  (Thanks to Tim Parenti for
1775    suggesting a CONTRIBUTING file, and to Tony Finch and Walter Harms
1776    for debugging it.)
1777
1778    The man pages have been updated to use function prototypes,
1779    to document thread-safe variants like localtime_r, and to document
1780    the NetBSD-inspired functions tzalloc, tzfree, localtime_rz, and
1781    mktime_z.
1782
1783    The fields in Link lines have been renamed to be more descriptive
1784    and more like the parameters of 'ln'.  LINK-FROM has become TARGET,
1785    and LINK-TO has become LINK-NAME.
1786
1787    tz-link.htm mentions the IETF's tzdist working group; Windows
1788    Runtime etc. (thanks to Matt Johnson); and HP-UX's tztab.
1789
1790    Some broken URLs have been fixed in the commentary.  (Thanks to
1791    Lester Caine.)
1792
1793    Commentary about Philippines DST has been updated, and commentary
1794    on pre-1970 time in India has been added.
1795
1796
1797Release 2014f - 2014-08-05 17:42:36 -0700
1798
1799  Changes affecting future timestamps
1800
1801    Russia will subtract an hour from most of its time zones on 2014-10-26
1802    at 02:00 local time.  (Thanks to Alexander Krivenyshev.)
1803    There are a few exceptions: Magadan Oblast (Asia/Magadan) and Zabaykalsky
1804    Krai are subtracting two hours; conversely, Chukotka Autonomous Okrug
1805    (Asia/Anadyr), Kamchatka Krai (Asia/Kamchatka), Kemerovo Oblast
1806    (Asia/Novokuznetsk), and the Samara Oblast and the Udmurt Republic
1807    (Europe/Samara) are not changing their clocks.  The changed zones are
1808    Europe/Kaliningrad, Europe/Moscow, Europe/Simferopol, Europe/Volgograd,
1809    Asia/Yekaterinburg, Asia/Omsk, Asia/Novosibirsk, Asia/Krasnoyarsk,
1810    Asia/Irkutsk, Asia/Yakutsk, Asia/Vladivostok, Asia/Khandyga,
1811    Asia/Sakhalin, and Asia/Ust-Nera; Asia/Magadan will have two hours
1812    subtracted; and Asia/Novokuznetsk's time zone abbreviation is affected,
1813    but not its UTC offset.  Two zones are added: Asia/Chita (split
1814    from Asia/Yakutsk, and also with two hours subtracted) and
1815    Asia/Srednekolymsk (split from Asia/Magadan, but with only one hour
1816    subtracted).  (Thanks to Tim Parenti for much of the above.)
1817
1818  Changes affecting time zone abbreviations
1819
1820    Australian eastern time zone abbreviations are now AEST/AEDT not EST,
1821    and similarly for the other Australian zones.  That is, for eastern
1822    standard and daylight saving time the abbreviations are AEST and AEDT
1823    instead of the former EST for both; similarly, ACST/ACDT, ACWST/ACWDT,
1824    and AWST/AWDT are now used instead of the former CST, CWST, and WST.
1825    This change does not affect UT offsets, only time zone abbreviations.
1826    (Thanks to Rich Tibbett and many others.)
1827
1828    Asia/Novokuznetsk shifts from NOVT to KRAT (remaining on UT +07)
1829    effective 2014-10-26 at 02:00 local time.
1830
1831    The time zone abbreviation for Xinjiang Time (observed in Ürümqi)
1832    has been changed from URUT to XJT.  (Thanks to Luther Ma.)
1833
1834    Prefer MSK/MSD for Moscow time in Russia, even in other cities.
1835    Similarly, prefer EET/EEST for eastern European time in Russia.
1836
1837    Change time zone abbreviations in (western) Samoa to use "ST" and
1838    "DT" suffixes, as this is more likely to match common practice.
1839    Prefix "W" to (western) Samoa time when its standard-time offset
1840    disagrees with that of American Samoa.
1841
1842    America/Metlakatla now uses PST, not MeST, to abbreviate its time zone.
1843
1844    Time zone abbreviations have been updated for Japan's two time
1845    zones used 1896-1937.  JWST now stands for Western Standard
1846    Time, and JCST for Central Standard Time (formerly this was CJT).
1847    These abbreviations are now used for time in Korea, Taiwan,
1848    and Sakhalin while controlled by Japan.
1849
1850  Changes affecting past timestamps
1851
1852    China's five zones have been simplified to two, since the post-1970
1853    differences in the other three seem to have been imaginary.  The
1854    zones Asia/Harbin, Asia/Chongqing, and Asia/Kashgar have been
1855    removed; backwards-compatibility links still work, albeit with
1856    different behaviors for timestamps before May 1980.  Asia/Urumqi's
1857    1980 transition to UT +08 has been removed, so that it is now at
1858    +06 and not +08.  (Thanks to Luther Ma and to Alois Treindl;
1859    Treindl sent helpful translations of two papers by Guo Qingsheng.)
1860
1861    Some zones have been turned into links, when they differed from existing
1862    zones only for older UT offsets where data entries were likely invented.
1863    These changes affect UT offsets in pre-1970 timestamps only.  This is
1864    similar to the change in release 2013e, except this time for western
1865    Africa.  The affected zones are: Africa/Bamako, Africa/Banjul,
1866    Africa/Conakry, Africa/Dakar, Africa/Freetown, Africa/Lome,
1867    Africa/Nouakchott, Africa/Ouagadougou, Africa/Sao_Tome, and
1868    Atlantic/St_Helena.  This also affects the backwards-compatibility
1869    link Africa/Timbuktu.  (Thanks to Alan Barrett, Stephen Colebourne,
1870    Tim Parenti, and David Patte for reporting problems in earlier
1871    versions of this change.)
1872
1873    Asia/Shanghai's pre-standard-time UT offset has been changed from
1874    8:05:57 to 8:05:43, the location of Xujiahui Observatory.  Its
1875    transition to standard time has been changed from 1928 to 1901.
1876
1877    Asia/Taipei switched to JWST on 1896-01-01, then to JST on 1937-10-01,
1878    then to CST on 1945-09-21 at 01:00, and did not observe DST in 1945.
1879    In 1946 it observed DST from 05-15 through 09-30; in 1947
1880    from 04-15 through 10-31; and in 1979 from 07-01 through 09-30.
1881    (Thanks to Yu-Cheng Chuang.)
1882
1883    Asia/Riyadh's transition to standard time is now 1947-03-14, not 1950.
1884
1885    Europe/Helsinki's 1942 fall-back transition was 10-04 at 01:00, not
1886    10-03 at 00:00.  (Thanks to Konstantin Hyppönen.)
1887
1888    Pacific/Pago_Pago has been changed from UT -11:30 to -11 for the
1889    period from 1911 to 1950.
1890
1891    Pacific/Chatham has been changed to New Zealand standard time plus
1892    45 minutes for the period before 1957, reflecting a 1956 remark in
1893    the New Zealand parliament.
1894
1895    Europe/Budapest has several pre-1946 corrections: in 1918 the transition
1896    out of DST was on 09-16, not 09-29; in 1919 it was on 11-24, not 09-15; in
1897    1945 it was on 11-01, not 11-03; in 1941 the transition to DST was 04-08
1898    not 04-06 at 02:00; and there was no DST in 1920.
1899
1900    Africa/Accra is now assumed to have observed DST from 1920 through 1935.
1901
1902    Time in Russia before 1927 or so has been corrected by a few seconds in
1903    the following zones: Europe/Moscow, Asia/Irkutsk, Asia/Tbilisi,
1904    Asia/Tashkent, Asia/Vladivostok, Asia/Yekaterinburg, Europe/Helsinki, and
1905    Europe/Riga.  Also, Moscow's location has been changed to its Kilometer 0
1906    point.  (Thanks to Vladimir Karpinsky for the Moscow changes.)
1907
1908  Changes affecting data format
1909
1910    A new file 'zone1970.tab' supersedes 'zone.tab' in the installed data.
1911    The new file's extended format allows multiple country codes per zone.
1912    The older file is still installed but is deprecated; its format is
1913    not changing and it will still be distributed for a while, but new
1914    applications should use the new file.
1915
1916    The new file format simplifies maintenance of obscure locations.
1917    To test this, it adds coverage for the Crozet Islands and the
1918    Scattered Islands.  (Thanks to Tobias Conradi and Antoine Leca.)
1919
1920    The file 'iso3166.tab' is planned to switch from ASCII to UTF-8.
1921    It is still ASCII now, but commentary about the switch has been added.
1922    The new file 'zone1970.tab' already uses UTF-8.
1923
1924  Changes affecting code
1925
1926    'localtime', 'mktime', etc. now use much less stack space if ALL_STATE
1927    is defined.  (Thanks to Elliott Hughes for reporting the problem.)
1928
1929    'zic' no longer mishandles input when ignoring case in locales that
1930    are not compatible with English, e.g., unibyte Turkish locales when
1931    compiled with HAVE_GETTEXT.
1932
1933    Error diagnostics of 'zic' and 'yearistype' have been reworded so that
1934    they no longer use ASCII '-' as if it were a dash.
1935
1936    'zic' now rejects output file names that contain '.' or '..' components.
1937    (Thanks to Tim Parenti for reporting the problem.)
1938
1939    'zic -v' now warns about output file names that do not follow
1940    POSIX rules, or that contain a digit or '.'.  (Thanks to Arthur
1941    David Olson for starting the ball rolling on this.)
1942
1943    Some lint has been removed when using GCC_DEBUG_FLAGS with GCC 4.9.0.
1944
1945  Changes affecting build procedure
1946
1947    'zic' no longer links in localtime.o and asctime.o, as they're not needed.
1948    (Thanks to John Cochran.)
1949
1950  Changes affecting documentation and commentary
1951
1952    The 'Theory' file documents legacy names, the longstanding
1953    exceptions to the POSIX-inspired file name rules.
1954
1955    The 'zic' documentation clarifies the role of time types when
1956    interpreting dates.  (Thanks to Arthur David Olson.)
1957
1958    Documentation and commentary now prefer UTF-8 to US-ASCII,
1959    allowing the use of proper accents in foreign words and names.
1960    Code and data have not changed because of this.  (Thanks to
1961    Garrett Wollman, Ian Abbott, and Guy Harris for helping to debug
1962    this.)
1963
1964    Non-HTML documentation and commentary now use plain-text URLs instead of
1965    HTML insertions, and are more consistent about bracketing URLs when they
1966    are not already surrounded by white space.  (Thanks to suggestions by
1967    Steffen Nurpmeso.)
1968
1969    There is new commentary about Xujiahui Observatory, the five time-zone
1970    project in China from 1918 to 1949, timekeeping in Japanese-occupied
1971    Shanghai, and Tibet Time in the 1950s.  The sharp-eyed can spot the
1972    warlord Jin Shuren in the data.
1973
1974    Commentary about the coverage of each Russian zone has been standardized.
1975    (Thanks to Tim Parenti).
1976
1977    There is new commentary about contemporary timekeeping in Ethiopia.
1978
1979    Obsolete comments about a 2007 proposal for DST in Kuwait has been removed.
1980
1981    There is new commentary about time in Poland in 1919.
1982
1983    Proper credit has been given to DST inventor George Vernon Hudson.
1984
1985    Commentary about time in Metlakatla, AK and Resolute, NU has been
1986    improved, with a new source for the former.
1987
1988    In zone.tab, Pacific/Easter no longer mentions Salas y Gómez, as it
1989    is uninhabited.
1990
1991    Commentary about permanent Antarctic bases has been updated.
1992
1993    Several typos have been corrected.  (Thanks to Tim Parenti for
1994    contributing some of these fixes.)
1995
1996    tz-link.htm now mentions the JavaScript libraries Moment Timezone,
1997    TimezoneJS.Date, Walltime-js, and Timezone.  (Thanks to a heads-up
1998    from Matt Johnson.)  Also, it mentions the Go 'latlong' package.
1999    (Thanks to a heads-up from Dirkjan Ochtman.)
2000
2001    The files usno1988, usno1989, usno1989a, usno1995, usno1997, and usno1998
2002    have been removed.  These obsolescent US Naval Observatory entries were no
2003    longer helpful for maintenance.  (Thanks to Tim Parenti for the suggestion.)
2004
2005
2006Release 2014e - 2014-06-12 21:53:52 -0700
2007
2008  Changes affecting near-future timestamps
2009
2010    Egypt's 2014 Ramadan-based transitions are June 26 and July 31 at 24:00.
2011    (Thanks to Imed Chihi.)  Guess that from 2015 on Egypt will temporarily
2012    switch to standard time at 24:00 the last Thursday before Ramadan, and
2013    back to DST at 00:00 the first Friday after Ramadan.
2014
2015    Similarly, Morocco's are June 28 at 03:00 and August 2 at 02:00.  (Thanks
2016    to Milamber Space Network.)  Guess that from 2015 on Morocco will
2017    temporarily switch to standard time at 03:00 the last Saturday before
2018    Ramadan, and back to DST at 02:00 the first Saturday after Ramadan.
2019
2020  Changes affecting past timestamps
2021
2022    The abbreviation "MSM" (Moscow Midsummer Time) is now used instead of
2023    "MSD" for Moscow's double daylight time in summer 1921.  Also, a typo
2024    "VLASST" has been repaired to be "VLAST" for Vladivostok summer time
2025    in 1991.  (Thanks to Hank W. for reporting the problems.)
2026
2027  Changes affecting commentary
2028
2029    tz-link.htm now cites RFC 7265 for jCal, mentions PTP and the
2030    draft CalDAV extension, updates URLs for TSP, TZInfo, IATA, and
2031    removes stale pointers to World Time Explorer and WORLDTIME.
2032
2033
2034Release 2014d - 2014-05-27 21:34:40 -0700
2035
2036  Changes affecting code
2037
2038    zic no longer generates files containing timestamps before the Big Bang.
2039    This works around GNOME bug 730332
2040    <https://bugzilla.gnome.org/show_bug.cgi?id=730332>.
2041    (Thanks to Leonardo Chiquitto for reporting the bug, and to
2042    Arthur David Olson and James Cloos for suggesting improvements to the fix.)
2043
2044  Changes affecting documentation
2045
2046    tz-link.htm now mentions GNOME.
2047
2048
2049Release 2014c - 2014-05-13 07:44:13 -0700
2050
2051  Changes affecting near-future timestamps
2052
2053    Egypt observes DST starting 2014-05-15 at 24:00.
2054    (Thanks to Ahmad El-Dardiry and Gunther Vermier.)
2055    Details have not been announced, except that DST will not be observed
2056    during Ramadan.  Guess that DST will stop during the same Ramadan dates as
2057    Morocco, and that Egypt's future spring and fall transitions will be the
2058    same as 2010 when it last observed DST, namely April's last Friday at
2059    00:00 to September's last Thursday at 23:00 standard time.  Also, guess
2060    that Ramadan transitions will be at 00:00 standard time.
2061
2062  Changes affecting code
2063
2064    zic now generates transitions for minimum time values, eliminating guesswork
2065    when handling low-valued timestamps.  (Thanks to Arthur David Olson.)
2066
2067    Port to Cygwin sans glibc.  (Thanks to Arthur David Olson.)
2068
2069  Changes affecting commentary and documentation
2070
2071    Remove now-confusing comment about Jordan.  (Thanks to Oleksii Nochovnyi.)
2072
2073
2074Release 2014b - 2014-03-24 21:28:50 -0700
2075
2076  Changes affecting near-future timestamps
2077
2078    Crimea switches to Moscow time on 2014-03-30 at 02:00 local time.
2079    (Thanks to Alexander Krivenyshev.)  Move its zone.tab entry from UA to RU.
2080
2081    New entry for Troll station, Antarctica.  (Thanks to Paul-Inge Flakstad and
2082    Bengt-Inge Larsson.)  This is currently an approximation; a better version
2083    will require the zic and localtime fixes mentioned below, and the plan is
2084    to wait for a while until at least the zic fixes propagate.
2085
2086  Changes affecting code
2087
2088    'zic' and 'localtime' no longer reject locations needing four transitions
2089    per year for the foreseeable future.  (Thanks to Andrew Main (Zefram).)
2090    Also, 'zic' avoids some unlikely failures due to integer overflow.
2091
2092  Changes affecting build procedure
2093
2094    'make check' now detects Rule lines defined but never used.
2095    The NZAQ rules, an instance of this problem, have been removed.
2096
2097  Changes affecting commentary and documentation
2098
2099    Fix Tuesday/Thursday typo in description of time in Israel.
2100    (Thanks to Bert Katz via Pavel Kharitonov and Mike Frysinger.)
2101
2102    Microsoft Windows 8.1 doesn't support tz database names.  (Thanks
2103    to Donald MacQueen.)  Instead, the Microsoft Windows Store app
2104    library supports them.
2105
2106    Add comments about Johnston Island time in the 1960s.
2107    (Thanks to Lyle McElhaney.)
2108
2109    Morocco's 2014 DST start will be as predicted.
2110    (Thanks to Sebastien Willemijns.)
2111
2112
2113Release 2014a - 2014-03-07 23:30:29 -0800
2114
2115  Changes affecting near-future timestamps
2116
2117    Turkey begins DST on 2014-03-31, not 03-30.  (Thanks to Faruk Pasin for
2118    the heads-up, and to Tim Parenti for simplifying the update.)
2119
2120  Changes affecting past timestamps
2121
2122    Fiji ended DST on 2014-01-19 at 02:00, not the previously-scheduled 03:00.
2123    (Thanks to Steffen Thorsen.)
2124
2125    Ukraine switched from Moscow to Eastern European time on 1990-07-01
2126    (not 1992-01-01), and observed DST during the entire next winter.
2127    (Thanks to Vladimir in Moscow via Alois Treindl.)
2128
2129    In 1988 Israel observed DST from 04-10 to 09-04, not 04-09 to 09-03.
2130    (Thanks to Avigdor Finkelstein.)
2131
2132  Changes affecting code
2133
2134    A uninitialized-storage bug in 'localtime' has been fixed.
2135    (Thanks to Logan Chien.)
2136
2137  Changes affecting the build procedure
2138
2139    The settings for 'make check_web' now default to Ubuntu 13.10.
2140
2141  Changes affecting commentary and documentation
2142
2143    The boundary of the US Pacific time zone is given more accurately.
2144    (Thanks to Alan Mintz.)
2145
2146    Chile's 2014 DST will be as predicted.  (Thanks to José Miguel Garrido.)
2147
2148    Paraguay's 2014 DST will be as predicted.  (Thanks to Carlos Raúl Perasso.)
2149
2150    Better descriptions of countries with same time zone history as
2151    Trinidad and Tobago since 1970.  (Thanks to Alan Barrett for suggestion.)
2152
2153    Several changes affect tz-link.htm, the main web page.
2154
2155      Mention Time.is (thanks to Even Scharning) and WX-now (thanks to
2156      David Braverman).
2157
2158      Mention xCal (Internet RFC 6321) and jCal.
2159
2160      Microsoft has some support for tz database names.
2161
2162      CLDR data formats include both XML and JSON.
2163
2164      Mention Maggiolo's map of solar vs standard time.
2165      (Thanks to Arthur David Olson.)
2166
2167      Mention TZ4Net.  (Thanks to Matt Johnson.)
2168
2169      Mention the timezone-olson Haskell package.
2170
2171      Mention zeitverschiebung.net.  (Thanks to Martin Jäger.)
2172
2173      Remove moribund links to daylight-savings-time.info and to
2174      Simple Timer + Clocks.
2175
2176      Update two links.  (Thanks to Oscar van Vlijmen.)
2177
2178      Fix some formatting glitches, e.g., remove random newlines from
2179      abbr elements' title attributes.
2180
2181
2182Release 2013i - 2013-12-17 07:25:23 -0800
2183
2184  Changes affecting near-future timestamps:
2185
2186    Jordan switches back to standard time at 00:00 on December 20, 2013.
2187    The 2006-2011 transition schedule is planned to resume in 2014.
2188    (Thanks to Steffen Thorsen.)
2189
2190  Changes affecting past timestamps:
2191
2192    In 2004, Cuba began DST on March 28, not April 4.
2193    (Thanks to Steffen Thorsen.)
2194
2195  Changes affecting code
2196
2197    The compile-time flag NOSOLAR has been removed, as nowadays the
2198    benefit of slightly shrinking runtime table size is outweighed by the
2199    cost of disallowing potential future updates that exceed old limits.
2200
2201  Changes affecting documentation and commentary
2202
2203    The files solar87, solar88, and solar89 are no longer distributed.
2204    They were a negative experiment - that is, a demonstration that
2205    tz data can represent solar time only with some difficulty and error.
2206    Their presence in the distribution caused confusion, as Riyadh
2207    civil time was generally not solar time in those years.
2208
2209    tz-link.htm now mentions Noda Time.  (Thanks to Matt Johnson.)
2210
2211
2212Release 2013h - 2013-10-25 15:32:32 -0700
2213
2214  Changes affecting current and future timestamps:
2215
2216    Libya has switched its UT offset back to +02 without DST, instead
2217    of +01 with DST.  (Thanks to Even Scharning.)
2218
2219    Western Sahara (Africa/El_Aaiun) uses Morocco's DST rules.
2220    (Thanks to Gwillim Law.)
2221
2222  Changes affecting future timestamps:
2223
2224    Acre and (we guess) western Amazonas will switch from UT -04 to -05
2225    on 2013-11-10.  This affects America/Rio_Branco and America/Eirunepe.
2226    (Thanks to Steffen Thorsen.)
2227
2228    Add entries for DST transitions in Morocco in the year 2038.
2229    This avoids some year-2038 glitches introduced in 2013g.
2230    (Thanks to Yoshito Umaoka for reporting the problem.)
2231
2232  Changes affecting API
2233
2234    The 'tzselect' command no longer requires the 'select' command,
2235    and should now work with /bin/sh on more platforms.  It also works
2236    around a bug in BusyBox awk before version 1.21.0.  (Thanks to
2237    Patrick 'P. J.' McDermott and Alan Barrett.)
2238
2239  Changes affecting code
2240
2241    Fix localtime overflow bugs with 32-bit unsigned time_t.
2242
2243    zdump no longer assumes sscanf returns maximal values on overflow.
2244
2245  Changes affecting the build procedure
2246
2247    The builder can specify which programs to use, if any, instead of
2248    'ar' and 'ranlib', and libtz.a is now built locally before being
2249    installed.  (Thanks to Michael Forney.)
2250
2251    A dependency typo in the 'zdump' rule has been fixed.
2252    (Thanks to Andrew Paprocki.)
2253
2254    The Makefile has been simplified by assuming that 'mkdir -p' and 'cp -f'
2255    work as specified by POSIX.2-1992 or later; this is portable nowadays.
2256
2257    'make clean' no longer removes 'leapseconds', since it's
2258    host-independent and is part of the distribution.
2259
2260    The unused makefile macros TZCSRCS, TZDSRCS, DATESRCS have been removed.
2261
2262  Changes affecting documentation and commentary
2263
2264    tz-link.htm now mentions TC TIMEZONE's draft time zone service protocol
2265    (thanks to Mike Douglass) and TimezoneJS.Date (thanks to Jim Fehrle).
2266
2267    Update URLs in tz-link page.  Add URLs for Microsoft Windows, since
2268    8.1 introduces tz support.  Remove URLs for Tru64 and UnixWare (no
2269    longer maintained) and for old advisories.  SOFA now does C.
2270
2271Release 2013g - 2013-09-30 21:08:26 -0700
2272
2273  Changes affecting current and near-future timestamps
2274
2275    Morocco now observes DST from the last Sunday in March to the last
2276    Sunday in October, not April to September respectively.  (Thanks
2277    to Steffen Thorsen.)
2278
2279  Changes affecting 'zic'
2280
2281    'zic' now runs on platforms that lack both hard links and symlinks.
2282    (Thanks to Theo Veenker for reporting the problem, for MinGW.)
2283    Also, fix some bugs on platforms that lack hard links but have symlinks.
2284
2285    'zic -v' again warns that Asia/Tehran has no POSIX environment variable
2286    to predict the far future, fixing a bug introduced in 2013e.
2287
2288  Changes affecting the build procedure
2289
2290    The 'leapseconds' file is again put into the tzdata tarball.
2291    Also, 'leapseconds.awk', so tzdata is self-contained.  (Thanks to
2292    Matt Burgess and Ian Abbott.)  The timestamps of these and other
2293    dependent files in tarballs are adjusted more consistently.
2294
2295  Changes affecting documentation and commentary
2296
2297    The README file is now part of the data tarball as well as the code.
2298    It now states that files are public domain unless otherwise specified.
2299    (Thanks to Andrew Main (Zefram) for asking for clarifications.)
2300    Its details about the 1989 release moved to a place of honor near
2301    the end of NEWS.
2302
2303
2304Release 2013f - 2013-09-24 23:37:36 -0700
2305
2306  Changes affecting near-future timestamps
2307
2308    Tocantins will very likely not observe DST starting this spring.
2309    (Thanks to Steffen Thorsen.)
2310
2311    Jordan will likely stay at UT +03 indefinitely, and will not fall
2312    back this fall.
2313
2314    Palestine will fall back at 00:00, not 01:00.  (Thanks to Steffen Thorsen.)
2315
2316  Changes affecting API
2317
2318    The types of the global variables 'timezone' and 'altzone' (if present)
2319    have been changed back to 'long'.  This is required for 'timezone'
2320    by POSIX, and for 'altzone' by common practice, e.g., Solaris 11.
2321    These variables were originally 'long' in the tz code, but were
2322    mistakenly changed to 'time_t' in 1987; nobody reported the
2323    incompatibility until now.  The difference matters on x32, where
2324    'long' is 32 bits and 'time_t' is 64.  (Thanks to Elliott Hughes.)
2325
2326  Changes affecting the build procedure
2327
2328    Avoid long strings in leapseconds.awk to work around a mawk bug.
2329    (Thanks to Cyril Baurand.)
2330
2331  Changes affecting documentation and commentary
2332
2333    New file 'NEWS' that contains release notes like this one.
2334
2335    Paraguay's law does not specify DST transition time; 00:00 is customary.
2336    (Thanks to Waldemar Villamayor-Venialbo.)
2337
2338    Minor capitalization fixes.
2339
2340  Changes affecting version-control only
2341
2342    The experimental GitHub repository now contains annotated and
2343    signed tags for recent releases, e.g., '2013e' for Release 2013e.
2344    Releases are tagged starting with 2012e; earlier releases were
2345    done differently, and tags would either not have a simple name or
2346    not exactly match what was released.
2347
2348    'make set-timestamps' is now simpler and a bit more portable.
2349
2350
2351Release 2013e - 2013-09-19 23:50:04 -0700
2352
2353  Changes affecting near-future timestamps
2354
2355    This year Fiji will start DST on October 27, not October 20.
2356    (Thanks to David Wheeler for the heads-up.)  For now, guess that
2357    Fiji will continue to spring forward the Sunday before the fourth
2358    Monday in October.
2359
2360  Changes affecting current and future time zone abbreviations
2361
2362    Use WIB/WITA/WIT rather than WIT/CIT/EIT for alphabetic Indonesian
2363    time zone abbreviations since 1932.  (Thanks to George Ziegler,
2364    Priyadi Iman Nurcahyo, Zakaria, Jason Grimes, Martin Pitt, and
2365    Benny Lin.)  This affects Asia/Dili, Asia/Jakarta, Asia/Jayapura,
2366    Asia/Makassar, and Asia/Pontianak.
2367
2368    Use ART (UT -03, standard time), rather than WARST (also -03, but
2369    daylight saving time) for San Luis, Argentina since 2009.
2370
2371  Changes affecting Godthåb timestamps after 2037 if version mismatch
2372
2373    Allow POSIX-like TZ strings where the transition time's hour can
2374    range from -167 through 167, instead of the POSIX-required 0
2375    through 24.  E.g., TZ='FJT-12FJST,M10.3.1/146,M1.3.4/75' for the
2376    new Fiji rules.  This is a more-compact way to represent
2377    far-future timestamps for America/Godthab, America/Santiago,
2378    Antarctica/Palmer, Asia/Gaza, Asia/Hebron, Asia/Jerusalem,
2379    Pacific/Easter, and Pacific/Fiji.  Other zones are unaffected by
2380    this change.  (Derived from a suggestion by Arthur David Olson.)
2381
2382    Allow POSIX-like TZ strings where daylight saving time is in
2383    effect all year.  E.g., TZ='WART4WARST,J1/0,J365/25' for Western
2384    Argentina Summer Time all year.  This supports a more-compact way
2385    to represent the 2013d data for America/Argentina/San_Luis.
2386    Because of the change for San Luis noted above this change does not
2387    affect the current data.  (Thanks to Andrew Main (Zefram) for
2388    suggestions that improved this change.)
2389
2390    Where these two TZ changes take effect, there is a minor extension
2391    to the tz file format in that it allows new values for the
2392    embedded TZ-format string, and the tz file format version number
2393    has therefore been increased from 2 to 3 as a precaution.
2394    Version-2-based client code should continue to work as before for
2395    all timestamps before 2038.  Existing version-2-based client code
2396    (tzcode, GNU/Linux, Solaris) has been tested on version-3-format
2397    files, and typically works in practice even for timestamps after
2398    2037; the only known exception is America/Godthab.
2399
2400  Changes affecting timestamps before 1970
2401
2402    Pacific/Johnston is now a link to Pacific/Honolulu.  This corrects
2403    some errors before 1947.
2404
2405    Some zones have been turned into links, when they differ from existing
2406    zones only in older data entries that were likely invented or that
2407    differ only in LMT or transitions from LMT.  These changes affect
2408    only timestamps before 1943.  The affected zones are:
2409    Africa/Juba, America/Anguilla, America/Aruba, America/Dominica,
2410    America/Grenada, America/Guadeloupe, America/Marigot,
2411    America/Montserrat, America/St_Barthelemy, America/St_Kitts,
2412    America/St_Lucia, America/St_Thomas, America/St_Vincent,
2413    America/Tortola, and Europe/Vaduz.  (Thanks to Alois Treindl for
2414    confirming that the old Europe/Vaduz zone was wrong and the new
2415    link is better for WWII-era times.)
2416
2417    Change Kingston Mean Time from -5:07:12 to -5:07:11.  This affects
2418    America/Cayman, America/Jamaica and America/Grand_Turk timestamps
2419    from 1890 to 1912.
2420
2421    Change the UT offset of Bern Mean Time from 0:29:44 to 0:29:46.
2422    This affects Europe/Zurich timestamps from 1853 to 1894.  (Thanks
2423    to Alois Treindl).
2424
2425    Change the date of the circa-1850 Zurich transition from 1849-09-12
2426    to 1853-07-16, overriding Shanks with data from Messerli about
2427    postal and telegraph time in Switzerland.
2428
2429  Changes affecting time zone abbreviations before 1970
2430
2431    For Asia/Jakarta, use BMT (not JMT) for mean time from 1923 to 1932,
2432    as Jakarta was called Batavia back then.
2433
2434  Changes affecting API
2435
2436    The 'zic' command now outputs a dummy transition when far-future
2437    data can't be summarized using a TZ string, and uses a 402-year
2438    window rather than a 400-year window.  For the current data, this
2439    affects only the Asia/Tehran file.  It does not affect any of the
2440    timestamps that this file represents, so zdump outputs the same
2441    information as before.  (Thanks to Andrew Main (Zefram).)
2442
2443    The 'date' command has a new '-r' option, which lets you specify
2444    the integer time to display, a la FreeBSD.
2445
2446    The 'tzselect' command has two new options '-c' and '-n', which lets you
2447    select a zone based on latitude and longitude.
2448
2449    The 'zic' command's '-v' option now warns about constructs that
2450    require the new version-3 binary file format.  (Thanks to Arthur
2451    David Olson for the suggestion.)
2452
2453    Support for floating-point time_t has been removed.
2454    It was always dicey, and POSIX no longer requires it.
2455    (Thanks to Eric Blake for suggesting to the POSIX committee to
2456    remove it, and thanks to Alan Barrett, Clive D.W. Feather, Andy
2457    Heninger, Arthur David Olson, and Alois Treindl, for reporting
2458    bugs and elucidating some of the corners of the old floating-point
2459    implementation.)
2460
2461    The signatures of 'offtime', 'timeoff', and 'gtime' have been
2462    changed back to the old practice of using 'long' to represent UT
2463    offsets.  This had been inadvertently and mistakenly changed to
2464    'int_fast32_t'.  (Thanks to Christos Zoulas.)
2465
2466    The code avoids undefined behavior on integer overflow in some
2467    more places, including gmtime, localtime, mktime and zdump.
2468
2469  Changes affecting the zdump utility
2470
2471    zdump now outputs "UT" when referring to Universal Time, not "UTC".
2472    "UTC" does not make sense for timestamps that predate the introduction
2473    of UTC, whereas "UT", a more-generic term, does.  (Thanks to Steve Allen
2474    for clarifying UT vs UTC.)
2475
2476  Data changes affecting behavior of tzselect and similar programs
2477
2478    Country code BQ is now called the more-common name "Caribbean Netherlands"
2479    rather than the more-official "Bonaire, St Eustatius & Saba".
2480
2481    Remove from zone.tab the names America/Montreal, America/Shiprock,
2482    and Antarctica/South_Pole, as they are equivalent to existing
2483    same-country-code zones for post-1970 timestamps.  The data entries for
2484    these names are unchanged, so the names continue to work as before.
2485
2486  Changes affecting code internals
2487
2488    zic -c now runs way faster on 64-bit hosts when given large numbers.
2489
2490    zic now uses vfprintf to avoid allocating and freeing some memory.
2491
2492    tzselect now computes the list of continents from the data,
2493    rather than have it hard-coded.
2494
2495    Minor changes pacify GCC 4.7.3 and GCC 4.8.1.
2496
2497  Changes affecting the build procedure
2498
2499    The 'leapseconds' file is now generated automatically from a
2500    new file 'leap-seconds.list', which is a copy of
2501    <ftp://ftp.nist.gov/pub/time/leap-seconds.list>
2502    A new source file 'leapseconds.awk' implements this.
2503    The goal is simplification of the future maintenance of 'leapseconds'.
2504
2505    When building the 'posix' or 'right' subdirectories, if the
2506    subdirectory would be a copy of the default subdirectory, it is
2507    now made a symbolic link if that is supported.  This saves about
2508    2 MB of file system space.
2509
2510    The links America/Shiprock and Antarctica/South_Pole have been
2511    moved to the 'backward' file.  This affects only nondefault builds
2512    that omit 'backward'.
2513
2514  Changes affecting version-control only
2515
2516    .gitignore now ignores 'date'.
2517
2518  Changes affecting documentation and commentary
2519
2520    Changes to the 'tzfile' man page
2521
2522      It now mentions that the binary file format may be extended in
2523      future versions by appending data.
2524
2525      It now refers to the 'zdump' and 'zic' man pages.
2526
2527    Changes to the 'zic' man page
2528
2529      It lists conditions that elicit a warning with '-v'.
2530
2531      It says that the behavior is unspecified when duplicate names
2532      are given, or if the source of one link is the target of another.
2533
2534      Its examples are updated to match the latest data.
2535
2536      The definition of white space has been clarified slightly.
2537      (Thanks to Michael Deckers.)
2538
2539    Changes to the 'Theory' file
2540
2541      There is a new section about the accuracy of the tz database,
2542      describing the many ways that errors can creep in, and
2543      explaining why so many of the pre-1970 timestamps are wrong or
2544      misleading (thanks to Steve Allen, Lester Caine, and Garrett
2545      Wollman for discussions that contributed to this).
2546
2547      The 'Theory' file describes LMT better (this follows a
2548      suggestion by Guy Harris).
2549
2550      It refers to the 2013 edition of POSIX rather than the 2004 edition.
2551
2552      It's mentioned that excluding 'backward' should not affect the
2553      other data, and it suggests at least one zone.tab name per
2554      inhabited country (thanks to Stephen Colebourne).
2555
2556      Some longstanding restrictions on names are documented, e.g.,
2557      'America/New_York' precludes 'America/New_York/Bronx'.
2558
2559      It gives more reasons for the 1970 cutoff.
2560
2561      It now mentions which time_t variants are supported, such as
2562      signed integer time_t.  (Thanks to Paul Goyette for reporting
2563      typos in an experimental version of this change.)
2564
2565      (Thanks to Philip Newton for correcting typos in these changes.)
2566
2567    Documentation and commentary is more careful to distinguish UT in
2568    general from UTC in particular.  (Thanks to Steve Allen.)
2569
2570    Add a better source for the Zurich 1894 transition.
2571    (Thanks to Pierre-Yves Berger.)
2572
2573    Update shapefile citations in tz-link.htm.  (Thanks to Guy Harris.)
2574
2575
2576Release 2013d - 2013-07-05 07:38:01 -0700
2577
2578  Changes affecting future timestamps:
2579
2580    Morocco's midsummer transitions this year are July 7 and August 10,
2581    not July 9 and August 8.  (Thanks to Andrew Paprocki.)
2582
2583    Israel now falls back on the last Sunday of October.
2584    (Thanks to Ephraim Silverberg.)
2585
2586  Changes affecting past timestamps:
2587
2588    Specify Jerusalem's location more precisely; this changes the pre-1880
2589    times by 2 s.
2590
2591  Changing affecting metadata only:
2592
2593    Fix typos in the entries for country codes BQ and SX.
2594
2595  Changes affecting code:
2596
2597    Rework the code to fix a bug with handling Australia/Macquarie on
2598    32-bit hosts (thanks to Arthur David Olson).
2599
2600    Port to platforms like NetBSD, where time_t can be wider than long.
2601
2602    Add support for testing time_t types other than the system's.
2603    Run 'make check_time_t_alternatives' to try this out.
2604    Currently, the tests fail for unsigned time_t;
2605    this should get fixed at some point.
2606
2607  Changes affecting documentation and commentary:
2608
2609    Deemphasize the significance of national borders.
2610
2611    Update the zdump man page.
2612
2613    Remove obsolete NOID comment (thanks to Denis Excoffier).
2614
2615    Update several URLs and comments in the web pages.
2616
2617    Spelling fixes (thanks to Kevin Lyda and Jonathan Leffler).
2618
2619    Update URL for CLDR Zone->Tzid table (thanks to Yoshito Umaoka).
2620
2621
2622Release 2013c - 2013-04-19 16:17:40 -0700
2623
2624  Changes affecting current and future timestamps:
2625
2626    Palestine observed DST starting March 29, 2013.  (Thanks to
2627    Steffen Thorsen.)  From 2013 on, Gaza and Hebron both observe DST,
2628    with the predicted rules being the last Thursday in March at 24:00
2629    to the first Friday on or after September 21 at 01:00.
2630
2631    Assume that the recent change to Paraguay's DST rules is permanent,
2632    by moving the end of DST to the 4th Sunday in March every year.
2633    (Thanks to Carlos Raúl Perasso.)
2634
2635  Changes affecting past timestamps:
2636
2637    Fix some historical data for Palestine to agree with that of
2638    timeanddate.com, as follows:
2639
2640	  The spring 2008 change in Gaza and Hebron was on 00:00 Mar 28, not
2641	  00:00 Apr 1.
2642
2643	  The fall 2009 change in Gaza and Hebron on Sep 4 was at 01:00, not
2644	  02:00.
2645
2646	  The spring 2010 change in Hebron was 00:00 Mar 26, not 00:01 Mar 27.
2647
2648	  The spring 2011 change in Gaza was 00:01 Apr 1, not 12:01 Apr 2.
2649
2650	  The spring 2011 change in Hebron on Apr 1 was at 00:01, not 12:01.
2651
2652	  The fall 2011 change in Hebron on Sep 30 was at 00:00, not 03:00.
2653
2654    Fix times of habitation for Macquarie to agree with the Tasmania
2655    Parks & Wildlife Service history, which indicates that permanent
2656    habitation was 1899-1919 and 1948 on.
2657
2658  Changing affecting metadata only:
2659
2660    Macquarie Island is politically part of Australia, not Antarctica.
2661    (Thanks to Tobias Conradi.)
2662
2663    Sort Macquarie more-consistently with other parts of Australia.
2664    (Thanks to Tim Parenti.)
2665
2666
2667Release 2013b - 2013-03-10 22:33:40 -0700
2668
2669  Changes affecting current and future timestamps:
2670
2671    Haiti uses US daylight-saving rules this year, and presumably future years.
2672    This changes timestamps starting today.  (Thanks to Steffen Thorsen.)
2673
2674    Paraguay will end DST on March 24 this year.
2675    (Thanks to Steffen Thorsen.)  For now, assume it's just this year.
2676
2677    Morocco does not observe DST during Ramadan;
2678    try to predict Ramadan in Morocco as best we can.
2679    (Thanks to Erik Homoet for the heads-up.)
2680
2681  Changes affecting commentary:
2682
2683    Update URLs in tz-link page.  Add URLs for webOS, BB10, iOS.
2684    Update URL for Solaris.  Mention Internet RFC 6557.
2685    Update Internet RFCs 2445->5545, 2822->5322.
2686    Switch from FTP to HTTP for Internet RFCs.
2687
2688
2689Release 2013a - 2013-02-27 09:20:35 -0800
2690
2691  Change affecting binary data format:
2692
2693    The zone offset at the end of version-2-format zone files is now
2694    allowed to be 24:00, as per POSIX.1-2008.  (Thanks to Arthur David Olson.)
2695
2696  Changes affecting current and future timestamps:
2697
2698    Chile's 2013 rules, and we guess rules for 2014 and later, will be
2699    the same as 2012, namely Apr Sun>=23 03:00 UTC to Sep Sun>=2 04:00 UTC.
2700    (Thanks to Steffen Thorsen and Robert Elz.)
2701
2702    New Zones Asia/Khandyga, Asia/Ust-Nera, Europe/Busingen.
2703    (Thanks to Tobias Conradi and Arthur David Olson.)
2704
2705  Many changes affect historical timestamps before 1940.
2706  These were deduced from: Milne J. Civil time. Geogr J. 1899
2707  Feb;13(2):173-94 <https://www.jstor.org/stable/1774359>.
2708
2709  Changes affecting the code:
2710
2711    Fix zic bug that mishandled Egypt's 2010 changes (this also affected
2712    the data).  (Thanks to Arthur David Olson.)
2713
2714    Fix localtime bug when time_t is unsigned and data files were generated
2715    by a signed time_t system.  (Thanks to Doug Bailey for reporting and
2716    to Arthur David Olson for fixing.)
2717
2718    Allow the email address for bug reports to be set by the packager.
2719    The default is tz@iana.org, as before.  (Thanks to Joseph S. Myers.)
2720
2721    Update HTML checking to be compatible with Ubuntu 12.10.
2722
2723    Check that files are a safe subset of ASCII.  At some point we may
2724    relax this requirement to a safe subset of UTF-8.  Without the
2725    check, some non-UTF-8 encodings were leaking into the distribution.
2726
2727  Commentary changes:
2728
2729    Restore a comment about copyright notices that was inadvertently deleted.
2730    (Thanks to Arthur David Olson.)
2731
2732    Improve the commentary about which districts observe what times
2733    in Russia.  (Thanks to Oscar van Vlijmen and Arthur David Olson).
2734
2735    Add web page links to tz.js.
2736
2737    Add "Run by the Monkeys" to tz-art.  (Thanks to Arthur David Olson.)
2738
2739
2740Release 2012j - 2012-11-12 18:34:49 -0800
2741
2742  Libya moved to CET this weekend, but with DST planned next year.
2743  (Thanks to Even Scharning, Steffen Thorsen, and Tim Parenti.)
2744
2745  Signatures now have the extension .asc, not .sign, as that's more
2746  standard.  (Thanks to Phil Pennock.)
2747
2748  The output of 'zdump --version', and of 'zic --version', now
2749  uses a format that is more typical for --version.
2750  (Thanks to Joseph S. Myers.)
2751
2752  The output of 'tzselect --help', 'zdump --help', and 'zic --help'
2753  now uses tz@iana.org rather than the old elsie address.
2754
2755  zic -v now complains about abbreviations that are less than 3
2756  or more than 6 characters, as per Posix.  Formerly, it checked
2757  for abbreviations that were more than 3.
2758
2759  'make public' no longer puts its temporary directory under /tmp,
2760  and uses the just-built zic rather than the system zic.
2761
2762  Various fixes to documentation and commentary.
2763
2764
2765Release 2012i - 2012-11-03 12:57:09 -0700
2766
2767  Cuba switches from DST tomorrow at 01:00.  (Thanks to Steffen Thorsen.)
2768
2769  Linker flags can now be specified via LDFLAGS.
2770  AWK now defaults to 'awk', not 'nawk'.
2771  The shell in tzselect now defaults to /bin/bash, but this can
2772  be overridden by specifying KSHELL.
2773  The main web page now mentions the unofficial GitHub repository.
2774  (Thanks to Mike Frysinger.)
2775
2776  Tarball signatures can now be built by running 'make signatures'.
2777  There are also new makefile rules 'tarballs', 'check_public', and
2778  separate makefile rules for each tarball and signature file.
2779  A few makefile rules are now more portable to strict POSIX.
2780
2781  The main web page now lists the canonical IANA URL.
2782
2783
2784Release 2012h - 2012-10-26 22:49:10 -0700
2785
2786  Bahia no longer has DST.  (Thanks to Kelley Cook.)
2787
2788  Tocantins has DST.  (Thanks to Rodrigo Severo.)
2789
2790  Israel has new DST rules next year.  (Thanks to Ephraim Silverberg.)
2791
2792  Jordan stays on DST this winter.  (Thanks to Steffen Thorsen.)
2793
2794  Web page updates.
2795
2796  More C modernization, except that at Arthur David Olson's suggestion
2797  the instances of 'register' were kept.
2798
2799
2800Release 2012g - 2012-10-17 20:59:45 -0700
2801
2802  Samoa fall 2012 and later.  (Thanks to Nicholas Pereira and Robert Elz.)
2803
2804  Palestine fall 2012.  (Thanks to Steffen Thorsen.)
2805
2806  Assume C89.
2807
2808  To attack the version-number problem, this release ships the file
2809  'Makefile' (which contains the release number) in both the tzcode and
2810  the tzdata tarballs.  The two Makefiles are identical, and should be
2811  identical in any matching pair of tarballs, so it shouldn't matter
2812  which order you extract the tarballs.  Perhaps we can come up with a
2813  better version-number scheme at some point; this scheme does have the
2814  virtue of not adding more files.
2815
2816
2817Release 2012f - 2012-09-12 23:17:03 -0700
2818
2819  * australasia (Pacific/Fiji): Fiji DST is October 21 through January
2820    20 this year.  (Thanks to Steffen Thorsen.)
2821
2822
2823Release 2012e - 2012-08-02 20:44:55 -0700
2824
2825  * australasia (Pacific/Fakaofo): Tokelau is UT +13, not +14.
2826    (Thanks to Steffen Thorsen.)
2827
2828  * Use a single version number for both code and data.
2829
2830  * .gitignore: New file.
2831
2832  * Remove trailing white space.
2833
2834
2835Release code2012c-data2012d - 2012-07-19 16:35:33 -0700
2836
2837  Changes for Morocco's timestamps, which take effect in a couple of
2838  hours, along with infrastructure changes to accommodate how the tz
2839  code and data are released on IANA.
2840
2841
2842Release data2012c - 2012-03-27 12:17:25 -0400
2843
2844  africa
2845	Summer time changes for Morocco (to start late April 2012)
2846
2847  asia
2848	Changes for 2012 for Gaza & the West Bank (Hebron) and Syria
2849
2850  northamerica
2851	Haiti following US/Canada rules for 2012 (and we're assuming,
2852	for now anyway, for the future).
2853
2854
2855Release 2012b - 2012-03-02 12:29:15 +0700
2856
2857  There is just one change to tzcode2012b (compared with 2012a):
2858  the Makefile that was accidentally included with 2012a has been
2859  replaced with the version that should have been there, which is
2860  identical with the previous version (from tzcode2011i).
2861
2862  There are just two changes in tzdata2012b compared with 2012a.
2863
2864  Most significantly, summer time in Cuba has been delayed 3 weeks
2865  (now starts April 1 rather than March 11).   Since Mar 11 (the old start
2866  date, as listed in 2012a) is just a little over a week away, this
2867  change is urgent.
2868
2869  Less importantly, an excess tab in one of the changes in zone.tab
2870  in 2012a has been removed.
2871
2872
2873Release 2012a - 2012-03-01 18:28:10 +0700
2874
2875  The changes in tzcode2012a (compared to the previous version, 2011i)
2876  are entirely to the README and tz-art.htm and tz-link.htm files, if
2877  none of those concern you, you can ignore the code update.  The changes
2878  reflect the changed addresses for the mailing list and the code and
2879  data distribution points & methods (and a link to DateTime::TimeZone::Tzfile
2880  has been added to tz-link.htm).
2881
2882  In tzdata2012a (compared to the previous release, which was 2011n)
2883  the major changes are:
2884	Chile 2011/2012 and 2012/2013 summer time date adjustments.
2885	Falkland Islands onto permanent summer time (we're assuming for the
2886		foreseeable future, though 2012 is all we're fairly certain of.)
2887	Armenia has abolished Summer Time.
2888	Tokelau jumped the International Date Line back last December
2889		(just the same as their near neighbour, Samoa).
2890	America/Creston is a new zone for a small area of British Columbia
2891	There will be a leapsecond 2012-06-30 23:59:60 UTC.
2892
2893  Other minor changes are:
2894	Corrections to 1918 Canadian summer time end dates.
2895	Updated URL for UK time zone history (in comments)
2896	A few typos in Le Corre's list of free French place names (comments)
2897
2898
2899Release data2011n - 2011-10-30 14:57:54 +0700
2900
2901  There are three changes of note - most urgently, Cuba (America/Havana)
2902  has extended summer time by two weeks, now to end on Nov 13, rather than
2903  the (already past) Oct 30.   Second, the Pridnestrovian Moldavian Republic
2904  (Europe/Tiraspol) decided not to split from the rest of Moldova after
2905  all, and consequently that zone has been removed (again) and reinstated
2906  in the "backward" file as a link to Europe/Chisinau.   And third, the
2907  end date for Fiji's summer time this summer was moved forward from the
2908  earlier planned Feb 26, to Jan 22.
2909
2910  Apart from that, Moldova (MD) returns to a single entry in zone.tab
2911  (and the incorrect syntax that was in the 2011m version of that file
2912  is so fixed - it would have been fixed in a different way had this
2913  change not happened - that's the "missing" sccs version id).
2914
2915
2916Release data2011m - 2011-10-24 21:42:16 +0700
2917
2918  In particular, the typos in comments in the data (2011-11-17 should have
2919  been 2011-10-17 as Alan Barrett noted, and spelling of Tiraspol that
2920  Tim Parenti noted) have been fixed, and the change for Ukraine has been
2921  made in all 4 Ukrainian zones, rather than just Kiev (again, thanks to
2922  Tim Parenti, and also Denys Gavrysh)
2923
2924  In addition, I added Europe/Tiraspol to zone.tab.
2925
2926  This time, all the files have new version numbers...  (including the files
2927  otherwise unchanged in 2011m that were changed in 2011l but didn't get new
2928  version numbers there...)
2929
2930
2931Release data2011l - 2011-10-10 11:15:43 +0700
2932
2933  There are just 2 changes that cause different generated tzdata files from
2934  zic, to Asia/Hebron and Pacific/Fiji - the possible change for Bahia, Brazil
2935  is included, but commented out.  Compared with the diff I sent out last week,
2936  this version also includes attributions for the sources for the changes
2937  (in much the same format as ado used, but the html tags have not been
2938  checked, verified, or used in any way at all, so if there are errors there,
2939  please let me know.)
2940
2941
2942Release data2011k - 2011-09-20 17:54:03 -0400
2943
2944  [not summarized]
2945
2946
2947Release data2011j - 2011-09-12 09:22:49 -0400
2948
2949  (contemporary changes for Samoa; past changes for Kenya, Uganda, and
2950  Tanzania); there are also two spelling corrections to comments in
2951  the australasia file (with thanks to Christos Zoulas).
2952
2953
2954Release 2011i - 2011-08-29 05:56:32 -0400
2955
2956  [not summarized]
2957
2958
2959Release data2011h - 2011-06-15 18:41:48 -0400
2960
2961  Russia and Curaçao changes
2962
2963
2964Release 2011g - 2011-04-25 09:07:22 -0400
2965
2966  update the rules for Egypt to reflect its abandonment of DST this year
2967
2968
2969Release 2011f - 2011-04-06 17:14:53 -0400
2970
2971  [not summarized]
2972
2973
2974Release 2011e - 2011-03-31 16:04:38 -0400
2975
2976  Morocco, Chile, and tz-link changes
2977
2978
2979Release 2011d - 2011-03-14 09:18:01 -0400
2980
2981  changes that impact present-day timestamps in Cuba, Samoa, and Turkey
2982
2983
2984Release 2011c - 2011-03-07 09:30:09 -0500
2985
2986  These do affect current timestamps in Chile and Annette Island, Canada.
2987
2988
2989Release 2011b - 2011-02-07 08:44:50 -0500
2990
2991  [not summarized]
2992
2993
2994Release 2011a - 2011-01-24 10:30:16 -0500
2995
2996  [not summarized]
2997
2998
2999Release data2010o - 2010-11-01 09:18:23 -0400
3000
3001  change to the end of DST in Fiji in 2011
3002
3003
3004Release 2010n - 2010-10-25 08:19:17 -0400
3005
3006  [not summarized]
3007
3008
3009Release 2010m - 2010-09-27 09:24:48 -0400
3010
3011  Hong Kong, Vostok, and zic.c changes
3012
3013
3014Release 2010l - 2010-08-16 06:57:25 -0400
3015
3016  [not summarized]
3017
3018
3019Release 2010k - 2010-07-26 10:42:27 -0400
3020
3021  [not summarized]
3022
3023
3024Release 2010j - 2010-05-10 09:07:48 -0400
3025
3026  changes for Bahía de Banderas and for version naming
3027
3028
3029Release data2010i - 2010-04-16 18:50:45 -0400
3030
3031  the end of DST in Morocco on 2010-08-08
3032
3033
3034Release data2010h - 2010-04-05 09:58:56 -0400
3035
3036  [not summarized]
3037
3038
3039Release data2010g - 2010-03-24 11:14:53 -0400
3040
3041  [not summarized]
3042
3043
3044Release 2010f - 2010-03-22 09:45:46 -0400
3045
3046  [not summarized]
3047
3048
3049Release data2010e - 2010-03-08 14:24:27 -0500
3050
3051  corrects the Dhaka bug found by Danvin Ruangchan
3052
3053
3054Release data2010d - 2010-03-06 07:26:01 -0500
3055
3056  [not summarized]
3057
3058
3059Release 2010c - 2010-03-01 09:20:58 -0500
3060
3061  changes including KRE's suggestion for earlier initialization of
3062  "goahead" and "goback" structure elements
3063
3064
3065Release code2010a - 2010-02-16 10:40:04 -0500
3066
3067  [not summarized]
3068
3069
3070Release data2010b - 2010-01-20 12:37:01 -0500
3071
3072  Mexico changes
3073
3074
3075Release data2010a - 2010-01-18 08:30:04 -0500
3076
3077  changes to Dhaka
3078
3079
3080Release data2009u - 2009-12-26 08:32:28 -0500
3081
3082  changes to DST in Bangladesh
3083
3084
3085Release 2009t - 2009-12-21 13:24:27 -0500
3086
3087  [not summarized]
3088
3089
3090Release data2009s - 2009-11-14 10:26:32 -0500
3091
3092  (cosmetic) Antarctica change and the DST-in-Fiji-in-2009-and-2010 change
3093
3094
3095Release 2009r - 2009-11-09 10:10:31 -0500
3096
3097  "antarctica" and "tz-link.htm" changes
3098
3099
3100Release 2009q - 2009-11-02 09:12:40 -0500
3101
3102  with two corrections as reported by Eric Muller and Philip Newton
3103
3104
3105Release data2009p - 2009-10-23 15:05:27 -0400
3106
3107  Argentina (including San Luis) changes (with the correction from
3108  Mariano Absatz)
3109
3110
3111Release data2009o - 2009-10-14 16:49:38 -0400
3112
3113  Samoa (commentary only), Pakistan, and Bangladesh changes
3114
3115
3116Release data2009n - 2009-09-22 15:13:38 -0400
3117
3118  added commentary for Argentina and a change to the end of DST in
3119  2009 in Pakistan
3120
3121
3122Release data2009m - 2009-09-03 10:23:43 -0400
3123
3124  Samoa and Palestine changes
3125
3126
3127Release data2009l - 2009-08-14 09:13:07 -0400
3128
3129  Samoa (comments only) and Egypt
3130
3131
3132Release 2009k - 2009-07-20 09:46:08 -0400
3133
3134  [not summarized]
3135
3136
3137Release data2009j - 2009-06-15 06:43:59 -0400
3138
3139  Bangladesh change (with a short turnaround since the DST change is
3140  impending)
3141
3142
3143Release 2009i - 2009-06-08 09:21:22 -0400
3144
3145  updating for DST in Bangladesh this year
3146
3147
3148Release 2009h - 2009-05-26 09:19:14 -0400
3149
3150  [not summarized]
3151
3152
3153Release data2009g - 2009-04-20 16:34:07 -0400
3154
3155  Cairo
3156
3157
3158Release data2009f - 2009-04-10 11:00:52 -0400
3159
3160  correct DST in Pakistan
3161
3162
3163Release 2009e - 2009-04-06 09:08:11 -0400
3164
3165  [not summarized]
3166
3167
3168Release 2009d - 2009-03-23 09:38:12 -0400
3169
3170  Morocco, Tunisia, Argentina, and American Astronomical Society changes
3171
3172
3173Release data2009c - 2009-03-16 09:47:51 -0400
3174
3175  change to the start of Cuban DST
3176
3177
3178Release 2009b - 2009-02-09 11:15:22 -0500
3179
3180  [not summarized]
3181
3182
3183Release 2009a - 2009-01-21 10:09:39 -0500
3184
3185  [not summarized]
3186
3187
3188Release data2008i - 2008-10-21 12:10:25 -0400
3189
3190  southamerica and zone.tab files, with Argentina DST rule changes and
3191  United States zone reordering and recommenting
3192
3193
3194Release 2008h - 2008-10-13 07:33:56 -0400
3195
3196  [not summarized]
3197
3198
3199Release 2008g - 2008-10-06 09:03:18 -0400
3200
3201  Fix a broken HTML anchor and update Brazil's DST transitions;
3202  there's also a slight reordering of information in tz-art.htm.
3203
3204
3205Release data2008f - 2008-09-09 22:33:26 -0400
3206
3207  [not summarized]
3208
3209
3210Release 2008e - 2008-07-28 14:11:17 -0400
3211
3212  changes by Arthur David Olson and Jesper Nørgaard Welen
3213
3214
3215Release data2008d - 2008-07-07 09:51:38 -0400
3216
3217  changes by Arthur David Olson, Paul Eggert, and Rodrigo Severo
3218
3219
3220Release data2008c - 2008-05-19 17:48:03 -0400
3221
3222  Pakistan, Morocco, and Mongolia
3223
3224
3225Release data2008b - 2008-03-24 08:30:59 -0400
3226
3227  including renaming Asia/Calcutta to Asia/Kolkata, with a backward
3228  link provided
3229
3230
3231Release 2008a - 2008-03-08 05:42:16 -0500
3232
3233  [not summarized]
3234
3235
3236Release 2007k - 2007-12-31 10:25:22 -0500
3237
3238  most importantly, changes to the "southamerica" file based on
3239  Argentina's readoption of daylight saving time
3240
3241
3242Release 2007j - 2007-12-03 09:51:01 -0500
3243
3244  1. eliminate the "P" (parameter) macro;
3245
3246  2. the "noncontroversial" changes circulated on the time zone
3247  mailing list (less the changes to "logwtmp.c");
3248
3249  3. eliminate "too many transition" errors when "min" is used in time
3250  zone rules;
3251
3252  4. changes by Paul Eggert (including updated information for Venezuela).
3253
3254
3255Release data2007i - 2007-10-30 10:28:11 -0400
3256
3257  changes for Cuba and Syria
3258
3259
3260Release 2007h - 2007-10-01 10:05:51 -0400
3261
3262  changes by Paul Eggert, as well as an updated link to the ICU
3263  project in tz-link.htm
3264
3265
3266Release 2007g - 2007-08-20 10:47:59 -0400
3267
3268  changes by Paul Eggert
3269
3270  The "leapseconds" file has been updated to incorporate the most
3271  recent International Earth Rotation and Reference Systems Service
3272  (IERS) bulletin.
3273
3274  There's an addition to tz-art.htm regarding the television show "Medium".
3275
3276
3277Release 2007f - 2007-05-07 10:46:46 -0400
3278
3279  changes by Paul Eggert (including Haiti, Turks and Caicos, and New
3280  Zealand)
3281
3282  changes to zic.c to allow hour values greater than 24 (along with
3283  Paul's improved time value overflow checking)
3284
3285
3286Release 2007e - 2007-04-02 10:11:52 -0400
3287
3288  Syria and Honduras changes by Paul Eggert
3289
3290  zic.c variable renaming changes by Arthur David Olson
3291
3292
3293Release 2007d - 2007-03-20 08:48:30 -0400
3294
3295  changes by Paul Eggert
3296
3297  the elimination of white space at the ends of lines
3298
3299
3300Release 2007c - 2007-02-26 09:09:37 -0500
3301
3302  changes by Paul Eggert
3303
3304
3305Release 2007b - 2007-02-12 09:34:20 -0500
3306
3307  Paul Eggert's proposed change to the quotation handling logic in zic.c.
3308
3309  changes to the commentary in "leapseconds" reflecting the IERS
3310  announcement that there is to be no positive leap second at the end
3311  of June 2007.
3312
3313
3314Release 2007a - 2007-01-08 12:28:29 -0500
3315
3316  changes by Paul Eggert
3317
3318  Derick Rethan's Asmara change
3319
3320  Oscar van Vlijmen's Easter Island local mean time change
3321
3322  symbolic link changes
3323
3324
3325Release 2006p - 2006-11-27 08:54:27 -0500
3326
3327  changes by Paul Eggert
3328
3329
3330Release 2006o - 2006-11-06 09:18:07 -0500
3331
3332  changes by Paul Eggert
3333
3334
3335Release 2006n - 2006-10-10 11:32:06 -0400
3336
3337  changes by Paul Eggert
3338
3339
3340Release 2006m - 2006-10-02 15:32:35 -0400
3341
3342  changes for Uruguay, Palestine, and Egypt by Paul Eggert
3343
3344  (minimalist) changes to zic.8 to clarify "until" information
3345
3346
3347Release data2006l - 2006-09-18 12:58:11 -0400
3348
3349  Paul's best-effort work on this coming weekend's Egypt time change
3350
3351
3352Release 2006k - 2006-08-28 12:19:09 -0400
3353
3354  changes by Paul Eggert
3355
3356
3357Release 2006j - 2006-08-21 09:56:32 -0400
3358
3359  changes by Paul Eggert
3360
3361
3362Release code2006i - 2006-08-07 12:30:55 -0400
3363
3364  localtime.c fixes
3365
3366  Ken Pizzini's conversion script
3367
3368
3369Release code2006h - 2006-07-24 09:19:37 -0400
3370
3371  adds public domain notices to four files
3372
3373  includes a fix for transition times being off by a second
3374
3375  adds a new recording to the "arts" file (information courtesy Colin Bowern)
3376
3377
3378Release 2006g - 2006-05-08 17:18:09 -0400
3379
3380  northamerica changes by Paul Eggert
3381
3382
3383Release 2006f - 2006-05-01 11:46:00 -0400
3384
3385  a missing version number problem is fixed (with thanks to Bradley
3386  White for catching the problem)
3387
3388
3389Release 2006d - 2006-04-17 14:33:43 -0400
3390
3391  changes by Paul Eggert
3392
3393  added new items to tz-arts.htm that were found by Paul
3394
3395
3396Release 2006c - 2006-04-03 10:09:32 -0400
3397
3398  two sets of data changes by Paul Eggert
3399
3400  a fencepost error fix in zic.c
3401
3402  changes to zic.c and the "europe" file to minimize differences
3403  between output produced by the old 32-bit zic and the new 64-bit
3404  version
3405
3406
3407Release 2006b - 2006-02-20 10:08:18 -0500
3408  [tz32code2006b + tz64code2006b + tzdata2006b]
3409
3410  64-bit code
3411
3412  All SCCS IDs were bumped to "8.1" for this release.
3413
3414
3415Release 2006a - 2006-01-30 08:59:31 -0500
3416
3417  changes by Paul Eggert (in particular, Indiana time zone moves)
3418
3419  an addition to the zic manual page to describe how special-case
3420  transitions are handled
3421
3422
3423Release 2005r - 2005-12-27 09:27:13 -0500
3424
3425  Canadian changes by Paul Eggert
3426
3427  They also add "<pre>" directives to time zone data files and reflect
3428  changes to warning message logic in "zdump.c" (but with calls to
3429  "gettext" kept unbundled at the suggestion of Ken Pizzini).
3430
3431
3432Release 2005q - 2005-12-13 09:17:09 -0500
3433
3434  Nothing earth-shaking here:
3435	1.  Electronic mail addresses have been removed.
3436	2.  Casts of the return value of exit have been removed.
3437	3.  Casts of the argument of is.* macros have been added.
3438	4.  Indentation in one section of zic.c has been fixed.
3439	5.  References to dead URLs in the data files have been dealt with.
3440
3441
3442Release 2005p - 2005-12-05 10:30:53 -0500
3443
3444  "systemv", "tz-link.htm", and "zdump.c" changes
3445  (less the casts of arguments to the is* macros)
3446
3447
3448Release 2005o - 2005-11-28 10:55:26 -0500
3449
3450  Georgia, Cuba, Nicaragua, and Jordan changes by Paul Eggert
3451
3452  zdump.c lint fixes by Arthur David Olson
3453
3454
3455Release 2005n - 2005-10-03 09:44:09 -0400
3456
3457  changes by Paul Eggert (both the Uruguay changes and the Kyrgyzstan
3458  et al. changes)
3459
3460
3461Release 2005m - 2005-08-29 12:15:40 -0400
3462
3463  changes by Paul Eggert (with a small tweak to the tz-art change)
3464
3465  a declaration of an unused variable has been removed from zdump.c
3466
3467
3468Release 2005l - 2005-08-22 12:06:39 -0400
3469
3470  changes by Paul Eggert
3471
3472  overflow/underflow checks by Arthur David Olson, minus changes to
3473  the "Theory" file about the pending addition of 64-bit data (I grow
3474  less confident of the changes being accepted with each passing day,
3475  and the changes no longer increase the data files nine-fold--there's
3476  less than a doubling in size by my local Sun's reckoning)
3477
3478
3479Release 2005k - 2005-07-14 14:14:24 -0400
3480
3481  The "leapseconds" file has been edited to reflect the recently
3482  announced leap second at the end of 2005.
3483
3484  I've also deleted electronic mail addresses from the files as an
3485  anti-spam measure.
3486
3487
3488Release 2005j - 2005-06-13 14:34:13 -0400
3489
3490  These reflect changes to limit the length of time zone abbreviations
3491  and the characters used in those abbreviations.
3492
3493  There are also changes to handle POSIX-style "quoted" time zone
3494  environment variables.
3495
3496  The changes were circulated on the time zone mailing list; the only
3497  change since then was the removal of a couple of minimum-length of
3498  abbreviation checks.
3499
3500
3501Release data2005i - 2005-04-21 15:04:16 -0400
3502
3503  changes (most importantly to Nicaragua and Haiti) by Paul Eggert
3504
3505
3506Release 2005h - 2005-04-04 11:24:47 -0400
3507
3508  changes by Paul Eggert
3509
3510  minor changes to Makefile and zdump.c to produce more useful output
3511  when doing a "make typecheck"
3512
3513
3514Release 2005g - 2005-03-14 10:11:21 -0500
3515
3516  changes by Paul Eggert (a change to current DST rules in Uruguay and
3517  an update to a link to time zone software)
3518
3519
3520Release 2005f - 2005-03-01 08:45:32 -0500
3521
3522  data and documentation changes by Paul Eggert
3523
3524
3525Release 2005e - 2005-02-10 15:59:44 -0500
3526
3527  [not summarized]
3528
3529
3530Release code2005d - 2005-01-31 09:21:47 -0500
3531
3532  make zic complain about links to links if the -v flag is used
3533
3534  have "make public" do more code checking
3535
3536  add an include to "localtime.c" for the benefit of gcc systems
3537
3538
3539Release 2005c - 2005-01-17 18:36:29 -0500
3540
3541  get better results when mktime runs on a system where time_t is double
3542
3543  changes to the data files (most importantly to Paraguay)
3544
3545
3546Release 2005b - 2005-01-10 09:19:54 -0500
3547
3548  Get localtime and gmtime working on systems with exotic time_t types.
3549
3550  Update the leap second commentary in the "leapseconds" file.
3551
3552
3553Release 2005a - 2005-01-01 13:13:44 -0500
3554
3555  [not summarized]
3556
3557
3558Release code2004i - 2004-12-14 13:42:58 -0500
3559
3560  Deal with systems where time_t is unsigned.
3561
3562
3563Release code2004h - 2004-12-07 11:40:18 -0500
3564
3565  64-bit-time_t changes
3566
3567
3568Release 2004g - 2004-11-02 09:06:01 -0500
3569
3570  update to Cuba (taking effect this weekend)
3571
3572  other changes by Paul Eggert
3573
3574  correction of the spelling of Oslo
3575
3576  changed versions of difftime.c and private.h
3577
3578
3579Release code2004f - 2004-10-21 10:25:22 -0400
3580
3581  Cope with wide-ranging tm_year values.
3582
3583
3584Release 2004e - 2004-10-11 14:47:21 -0400
3585
3586  Brazil/Argentina/Israel changes by Paul Eggert
3587
3588  changes to tz-link.htm by Paul
3589
3590  one small fix to Makefile
3591
3592
3593Release 2004d - 2004-09-22 08:27:29 -0400
3594
3595  Avoid overflow problems when TM_YEAR_BASE is added to an integer.
3596
3597
3598Release 2004c - 2004-08-11 12:06:26 -0400
3599
3600  asctime-related changes
3601
3602  (variants of) some of the documentation changes suggested by Paul Eggert
3603
3604
3605Release 2004b - 2004-07-19 14:33:35 -0400
3606
3607  data changes by Paul Eggert - most importantly, updates for Argentina
3608
3609
3610Release 2004a - 2004-05-27 12:00:47 -0400
3611
3612  changes by Paul Eggert
3613
3614  Handle DST transitions that occur at the end of a month in some
3615  years but at the start of the following month in other years.
3616
3617  Add a copy of the correspondence that's the basis for claims about
3618  DST in the Navajo Nation.
3619
3620
3621Release 2003e - 2003-12-15 09:36:47 -0500
3622
3623  changes by Arthur David Olson (primarily code changes)
3624
3625  changes by Paul Eggert (primarily data changes)
3626
3627  minor changes to "Makefile" and "northamerica" (in the latter case,
3628  optimization of the "Toronto" rules)
3629
3630
3631Release 2003d - 2003-10-06 09:34:44 -0400
3632
3633  changes by Paul Eggert
3634
3635
3636Release 2003c - 2003-09-16 10:47:05 -0400
3637
3638  Fix bad returns in zic.c's inleap function.
3639  Thanks to Bradley White for catching the problem!
3640
3641
3642Release 2003b - 2003-09-16 07:13:44 -0400
3643
3644  Add a "--version" option (and documentation) to the zic and zdump commands.
3645
3646  changes to overflow/underflow checking in zic
3647
3648  a localtime typo fix.
3649
3650  Update the leapseconds and tz-art.htm files.
3651
3652
3653Release 2003a - 2003-03-24 09:30:54 -0500
3654
3655  changes by Paul Eggert
3656
3657  a few additions and modifications to the tz-art.htm file
3658
3659
3660Release 2002d - 2002-10-15 13:12:42 -0400
3661
3662  changes by Paul Eggert, less the "Britain (UK)" change in iso3166.tab
3663
3664  There's also a new time zone quote in "tz-art.htm".
3665
3666
3667Release 2002c - 2002-04-04 11:55:20 -0500
3668
3669  changes by Paul Eggert
3670
3671  Change zic.c to avoid creating symlinks to files that don't exist.
3672
3673
3674Release 2002b - 2002-01-28 12:56:03 -0500
3675
3676  [These change notes are for Release 2002a, which was corrupted.
3677  2002b was a corrected version of 2002a.]
3678
3679  changes by Paul Eggert
3680
3681  Update the "leapseconds" file to note that there'll be no leap
3682  second at the end of June, 2002.
3683
3684  Change "zic.c" to deal with a problem in handling the "Asia/Bishkek" zone.
3685
3686  Change to "difftime.c" to avoid sizeof problems.
3687
3688
3689Release 2001d - 2001-10-09 13:31:32 -0400
3690
3691  changes by Paul Eggert
3692
3693
3694Release 2001c - 2001-06-05 13:59:55 -0400
3695
3696  changes by Paul Eggert and Andrew Brown
3697
3698
3699Release 2001b - 2001-04-05 16:44:38 -0400
3700
3701  changes by Paul Eggert (modulo jnorgard's typo fix)
3702
3703  tz-art.htm has been HTMLified.
3704
3705
3706Release 2001a - 2001-03-13 12:57:44 -0500
3707
3708  changes by Paul Eggert
3709
3710  An addition to the "leapseconds" file: comments with the text of the
3711  latest IERS leap second notice.
3712
3713  Trailing white space has been removed from data file lines, and
3714  repeated spaces in "Rule Jordan" lines in the "asia" file have been
3715  converted to tabs.
3716
3717
3718Release 2000h - 2000-12-14 15:33:38 -0500
3719
3720  changes by Paul Eggert
3721
3722  one typo fix in the "art" file
3723
3724  With providence, this is the last update of the millennium.
3725
3726
3727Release 2000g - 2000-10-10 11:35:22 -0400
3728
3729  changes by Paul Eggert
3730
3731  correction of John Mackin's name submitted by Robert Elz
3732
3733  Garry Shandling's Daylight Saving Time joke (!?!) from the recent
3734  Emmy Awards broadcast.
3735
3736
3737Release 2000f - 2000-08-10 09:31:58 -0400
3738
3739  changes by Paul Eggert
3740
3741  Added information in "tz-art.htm" on a Seinfeld reference to DST.
3742
3743  Error checking and messages in the "yearistype" script have been
3744  improved.
3745
3746
3747Release 2000e - 2000-07-31 09:27:54 -0400
3748
3749  data changes by Paul Eggert
3750
3751  a change to the default value of the defined constant HAVE_STRERROR
3752
3753  the addition of a Dave Barry quote on DST to the tz-arts file
3754
3755
3756Release 2000d - 2000-04-20 15:43:04 -0400
3757
3758  changes to the documentation and code of strftime for C99 conformance
3759
3760  a bug fix for date.c
3761
3762  These are based on (though modified from) changes by Paul Eggert.
3763
3764
3765Release 2000c - 2000-03-04 10:31:43 -0500
3766
3767  changes by Paul Eggert
3768
3769
3770Release 2000b - 2000-02-21 12:16:29 -0500
3771
3772  changes by Paul Eggert and Joseph Myers
3773
3774  modest tweaks to the tz-art.htm and tz-link.htm files
3775
3776
3777Release 2000a - 2000-01-18 09:21:26 -0500
3778
3779  changes by Paul Eggert
3780
3781  The two hypertext documents have also been renamed.
3782
3783
3784Release code1999i-data1999j - 1999-11-15 18:43:22 -0500
3785
3786  Paul Eggert's changes
3787
3788  additions to the "zic" manual page and the "Arts.htm" file
3789
3790
3791Release code1999h-data1999i - 1999-11-08 14:55:21 -0500
3792
3793  [not summarized]
3794
3795
3796Release data1999h - 1999-10-07 03:50:29 -0400
3797
3798  changes by Paul Eggert to "europe" (most importantly, fixing
3799  Lithuania and Estonia)
3800
3801
3802Release 1999g - 1999-09-28 11:06:18 -0400
3803
3804  data changes by Paul Eggert (most importantly, the change for
3805  Lebanon that buys correctness for this coming Sunday)
3806
3807  The "code" file contains changes to "Makefile" and "checktab.awk" to
3808  allow better checking of time zone files before they are published.
3809
3810
3811Release 1999f - 1999-09-23 09:48:14 -0400
3812
3813  changes by Arthur David Olson and Paul Eggert
3814
3815
3816Release 1999e - 1999-08-17 15:20:54 -0400
3817
3818  changes circulated by Paul Eggert, although the change to handling
3819  of DST-specifying time zone names has been commented out for now
3820  (search for "XXX" in "localtime.c" for details).  These files also
3821  do not make any changes to the start of DST in Brazil.
3822
3823  In addition to Paul's changes, there are updates to "Arts.htm" and
3824  cleanups of URLs.
3825
3826
3827Release 1999d - 1999-03-30 11:31:07 -0500
3828
3829  changes by Paul Eggert
3830
3831  The Makefile's "make public" rule has also been changed to do a test
3832  compile of each individual time zone data file (which should help
3833  avoid problems such as the one we had with Nicosia).
3834
3835
3836Release 1999c - 1999-03-25 09:47:47 -0500
3837
3838  changes by Paul Eggert, most importantly the change for Chile.
3839
3840
3841Release 1999b - 1999-02-01 17:51:44 -0500
3842
3843  changes by Paul Eggert
3844
3845  code changes (suggested by Mani Varadarajan, mani at be.com) for
3846  correct handling of symbolic links when building using a relative directory
3847
3848  code changes to generate correct messages for failed links
3849
3850  updates to the URLs in Arts.htm
3851
3852
3853Release 1999a - 1999-01-19 16:20:29 -0500
3854
3855  error message internationalizations and corrections in zic.c and
3856  zdump.c (as suggested by Vladimir Michl, vladimir.michl at upol.cz,
3857  to whom thanks!)
3858
3859
3860Release code1998h-data1998i - 1998-10-01 09:56:10 -0400
3861
3862  changes for Brazil, Chile, and Germany
3863
3864  support for use of "24:00" in the input files for the time zone compiler
3865
3866
3867Release code1998g-data1998h - 1998-09-24 10:50:28 -0400
3868
3869  changes by Paul Eggert
3870
3871  correction to a define in the "private.h" file
3872
3873
3874Release data1998g - 1998-08-11 03:28:35 -0000
3875  [tzdata1998g.tar.gz is missing!]
3876
3877  Lithuanian change provided by mgedmin at pub.osf.it
3878
3879  Move creation of the GMT link with Etc/GMT to "etcetera" (from
3880  "backward") to ensure that the GMT file is created even where folks
3881  don't want the "backward" links (as suggested by Paul Eggert).
3882
3883
3884Release data1998f - 1998-07-20 13:50:00 -0000
3885  [tzdata1998f.tar.gz is missing!]
3886
3887  Update the "leapseconds" file to include the newly-announced
3888  insertion at the end of 1998.
3889
3890
3891Release code1998f - 1998-06-01 10:18:31 -0400
3892
3893  addition to localtime.c by Guy Harris
3894
3895
3896Release 1998e - 1998-05-28 09:56:26 -0400
3897
3898  The Makefile is changed to produce zoneinfo-posix rather than
3899  zoneinfo/posix, and to produce zoneinfo-leaps rather than
3900  zoneinfo/right.
3901
3902  data changes by Paul Eggert
3903
3904  changes from Guy Harris to provide asctime_r and ctime_r
3905
3906  A usno1998 file (substantially identical to usno1997) has been added.
3907
3908
3909Release 1998d - 1998-05-14 11:58:34 -0400
3910
3911  changes to comments (in particular, elimination of references to CIA maps).
3912  "Arts.htm", "WWW.htm", "asia", and "australasia" are the only places
3913  where changes occur.
3914
3915
3916Release 1998c - 1998-02-28 12:32:26 -0500
3917
3918  changes by Paul Eggert (save the "French correction," on which I'll
3919  wait for the dust to settle)
3920
3921  symlink changes
3922
3923  changes and additions to Arts.htm
3924
3925
3926Release 1998b - 1998-01-17 14:31:51 -0500
3927
3928  URL cleanups and additions
3929
3930
3931Release 1998a - 1998-01-13 12:37:35 -0500
3932
3933  changes by Paul Eggert
3934
3935
3936Release code1997i-data1997k - 1997-12-29 09:53:41 -0500
3937
3938  changes by Paul Eggert, with minor modifications from Arthur David
3939  Olson to make the files more browser friendly
3940
3941
3942Release code1997h-data1997j - 1997-12-18 17:47:35 -0500
3943
3944  minor changes to put "TZif" at the start of each time zone information file
3945
3946  a rule has also been added to the Makefile so you can
3947	make zones
3948  to just recompile the zone information files (rather than doing a
3949  full "make install" with its other effects).
3950
3951
3952Release data1997i - 1997-10-07 08:45:38 -0400
3953
3954  changes to Africa by Paul Eggert
3955
3956
3957Release code1997g-data1997h - 1997-09-04 16:56:54 -0400
3958
3959  corrections for Uruguay (and other locations)
3960
3961  Arthur David Olson's simple-minded fix allowing mktime to both
3962  correctly handle leap seconds and correctly handle tm_sec values
3963  upon which arithmetic has been performed.
3964
3965
3966Release code1997f-data1997g - 1997-07-19 13:15:02 -0400
3967
3968  Paul Eggert's updates
3969
3970  a small change to a function prototype;
3971
3972  "Music" has been renamed "Arts.htm", HTMLified, and augmented to
3973  include information on Around the World in Eighty Days.
3974
3975
3976Release code1997e-data1997f - 1997-05-03 18:52:34 -0400
3977
3978  fixes to zic's error handling
3979
3980  changes inspired by the item circulated on Slovenia
3981
3982  The description of Web resources has been HTMLified for browsing
3983  convenience.
3984
3985  A new piece of tz-related music has been added to the "Music" file.
3986
3987
3988Release code1997d-data1997e - 1997-03-29 12:48:52 -0500
3989
3990  Paul Eggert's latest suggestions
3991
3992
3993Release code1997c-data1997d - 1997-03-07 20:37:54 -0500
3994
3995  changes to "zic.c" to correct performance of the "-s" option
3996
3997  a new file "usno1997"
3998
3999
4000Release data1997c - 1997-03-04 09:58:18 -0500
4001
4002  changes in Israel
4003
4004
4005Release 1997b - 1997-02-27 18:34:19 -0500
4006
4007  The data file incorporates the 1997 leap second.
4008
4009  The code file incorporates Arthur David Olson's take on the
4010  zic/multiprocessor/directory-creation situation.
4011
4012
4013Release 1997a - 1997-01-21 09:11:10 -0500
4014
4015  Paul Eggert's Antarctica (and other changes)
4016
4017  Arthur David Olson finessed the "getopt" issue by checking against
4018  both -1 and EOF (regardless of POSIX, SunOS 4.1.1's manual says -1
4019  is returned while SunOS 5.5's manual says EOF is returned).
4020
4021
4022Release code1996o-data1996n - 1996-12-27 21:42:05 -0500
4023
4024  Paul Eggert's latest changes
4025
4026
4027Release code1996n - 1996-12-16 09:42:02 -0500
4028
4029  link snapping fix from Bruce Evans (via Garrett Wollman)
4030
4031
4032Release data1996m - 1996-11-24 02:37:34 -0000
4033  [tzdata1996m.tar.gz is missing!]
4034
4035  Paul Eggert's batch of changes
4036
4037
4038Release code1996m-data1996l - 1996-11-05 14:00:12 -0500
4039
4040  No functional changes here; the files have simply been changed to
4041  make more use of ISO style dates in comments. The names of the above
4042  files now include the year in full.
4043
4044
4045Release code96l - 1996-09-08 17:12:20 -0400
4046
4047  tzcode96k was missing a couple of pieces.
4048
4049
4050Release 96k - 1996-09-08 16:06:22 -0400
4051
4052  the latest round of changes from Paul Eggert
4053
4054  the recent Year 2000 material
4055
4056
4057Release code96j - 1996-07-30 13:18:53 -0400
4058
4059  Set sp->typecnt as suggested by Timothy Patrick Murphy.
4060
4061
4062Release code96i - 1996-07-27 20:11:35 -0400
4063
4064  Paul's suggested patch for strftime %V week numbers
4065
4066
4067Release data96i - 1996-07-01 18:13:04 -0400
4068
4069  "northamerica" and "europe" changes by Paul Eggert
4070
4071
4072Release code96h - 1996-06-05 08:02:21 -0400
4073
4074  fix for handling transitions specified in Universal Time
4075
4076  Some "public domain" notices have also been added.
4077
4078
4079Release code96g - 1996-05-16 14:00:26 -0400
4080
4081  fix for the simultaneous-DST-and-zone-change challenge
4082
4083
4084Release data96h - 1996-05-09 17:40:51 -0400
4085
4086  changes by Paul Eggert
4087
4088
4089Release code96f-data96g - 1996-05-03 03:09:59 -0000
4090  [tzcode96f.tar.gz + tzdata96g.tar.gz are both missing!]
4091
4092  The changes get us some of the way to fixing the problems noted in Paul
4093  Eggert's letter yesterday (in addition to a few others).  The approach
4094  has been to make zic a bit smarter about figuring out what time zone
4095  abbreviations apply just after the time specified in the "UNTIL" part
4096  of a zone line.  Putting the smarts in zic means avoiding having
4097  transition times show up in both "Zone" lines and "Rule" lines, which
4098  in turn avoids multiple transition time entries in time zone files.
4099  (This also makes the zic input files such as "europe" a bit shorter and
4100  should ease maintenance.)
4101
4102
4103Release data96f - 1996-04-19 19:20:03 -0000
4104  [tzdata96f.tar.gz is missing!]
4105
4106  The only changes are to the "northamerica" file; the time zone
4107  abbreviation for Denver is corrected to MST (and MDT), and the
4108  comments for Mexico have been updated.
4109
4110
4111Release data96e - 1996-03-19 17:37:26 -0500
4112
4113  Proposals by Paul Eggert, in particular the Portugal change that
4114  comes into play at the end of this month.
4115
4116
4117Release data96d - 1996-03-18 20:49:39 -0500
4118
4119  [not summarized]
4120
4121
4122Release code96e - 1996-02-29 15:43:27 -0000
4123  [tzcode96e.tar.gz is missing!]
4124
4125  internationalization changes and the fix to the documentation for strftime
4126
4127
4128Release code96d-data96c - 1996-02-12 11:05:27 -0500
4129
4130  The "code" file simply updates Bob Kridle's electronic address.
4131
4132  The "data" file updates rules for Mexico.
4133
4134
4135Release data96b - 1996-01-27 15:44:42 -0500
4136
4137  Kiribati change
4138
4139
4140Release code96c - 1996-01-16 16:58:15 -0500
4141
4142  leap-year streamlining and binary-search changes
4143
4144  fix to newctime.3
4145
4146
4147Release code96b - 1996-01-10 20:42:39 -0500
4148
4149  fixes and enhancements from Paul Eggert, including code that
4150  emulates the behavior of recent versions of the SunOS "date"
4151  command.
4152
4153
4154Release 96a - 1996-01-06 09:08:24 -0500
4155
4156  Israel updates
4157
4158  fixes to strftime.c for correct ISO 8601 week number generation,
4159  plus support for two new formats ('G' and 'g') to give ISO 8601 year
4160  numbers (which are not necessarily the same as calendar year numbers)
4161
4162
4163Release code95i-data95m - 1995-12-21 12:46:47 -0500
4164
4165  The latest revisions from Paul Eggert are included, the usno1995
4166  file has been updated, and a new file ("WWW") covering useful URLs
4167  has been added.
4168
4169
4170Release code95h-data95l - 1995-12-19 18:10:12 -0500
4171
4172  A simplification of a macro definition, a change to data for Sudan,
4173  and (for last minute shoppers) notes in the "Music" file on the CD
4174  "Old Man Time".
4175
4176
4177Release code95g-data95k - 1995-10-30 10:32:47 -0500
4178
4179  (slightly reformatted) 8-bit-clean proposed patch
4180
4181  minor patch: US/Eastern -> America/New_York
4182
4183  snapshot of the USNO's latest data ("usno1995")
4184
4185  some other minor cleanups
4186
4187
4188Release code95f-data95j - 1995-10-28 21:01:34 -0000
4189  [tzcode95f.tar.gz + tzdata95j.tar.gz are both missing!]
4190
4191  European cleanups
4192
4193  support for 64-bit time_t's
4194
4195  optimization in localtime.c
4196
4197
4198Release code95e - 1995-10-13 13:23:57 -0400
4199
4200  the mktime change to scan from future to past when trying to find time zone
4201  offsets
4202
4203
4204Release data95i - 1995-09-26 10:43:26 -0400
4205
4206  For Canada/Central, guess that the Sun customer's "one week too
4207  early" was just a approximation, and the true error is one month
4208  too early.  This is consistent with the rest of Canada.
4209
4210
4211Release data95h - 1995-09-21 11:26:48 -0400
4212
4213  latest changes from Paul Eggert
4214
4215
4216Release code95d - 1995-09-14 11:14:45 -0400
4217
4218  the addition of a "Music" file, which documents four recorded
4219  versions of the tune "Save That Time".
4220
4221
4222Release data95g - 1995-09-01 17:21:36 -0400
4223
4224  "yearistype" correction
4225
4226
4227Release data95f - 1995-08-28 20:46:56 -0400
4228
4229  Paul Eggert's change to the australasia file
4230
4231
4232Release data95e - 1995-07-08 18:02:34 -0400
4233
4234  The only change is a leap second at the end of this year.
4235  Thanks to Bradley White for forwarding news on the leap second.
4236
4237
4238Release data95d - 1995-07-03 13:26:22 -0400
4239
4240  Paul Eggert's changes
4241
4242
4243Release data95c - 1995-07-02 19:19:28 -0400
4244
4245  changes to "asia", "backward", "europe", and "southamerica"
4246  (read: northamericacentrics need not apply)
4247
4248
4249Release code95c - 1995-03-13 14:00:46 -0500
4250
4251  one-line fix for sign extension problems in detzcode
4252
4253
4254Release 95b - 1995-03-04 11:22:38 -0500
4255
4256  Minor changes in both:
4257
4258  The "code" file contains a workaround for the lack of "unistd.h" in
4259  Microsoft C++ version 7.
4260
4261  The "data" file contains a fixed "Link" for America/Shiprock.
4262
4263
4264Release 94h - 1994-12-10 12:51:14 -0500
4265
4266  The files:
4267
4268  *	incorporate the changes to "zdump" and "date" to make changes to
4269	the "TZ" environment variable permanent;
4270
4271  *	incorporate the table changes by Paul Eggert;
4272
4273  *	include (and document) support for universal time specifications in
4274	data files - but do not (yet) include use of this feature in the
4275	data files.
4276
4277  Think of this as "TZ Classic" - the software has been set up not to break if
4278  universal time shows up in its input, and data entries have been
4279  left as is so as not to break existing implementations.
4280
4281
4282Release data94f - 1994-08-20 12:56:09 -0400
4283
4284  (with thanks!) the latest data updates from Paul Eggert
4285
4286
4287Release data94e - 1994-06-04 13:13:53 -0400
4288
4289  [not summarized]
4290
4291
4292Release code94g - 1994-05-05 12:14:07 -0400
4293
4294  fix missing "optind.c" and a reference to it in the Makefile
4295
4296
4297Release code94f - 1994-05-05 13:00:33 -0000
4298  [tzcode94f.tar.gz is missing!]
4299
4300  changes to avoid overflow in difftime, as well as changes to cope
4301  with the 52/53 challenge in strftime
4302
4303
4304Release code94e - 1994-03-30 23:32:59 -0500
4305
4306  change for the benefit of PCTS
4307
4308
4309Release 94d - 1994-02-24 15:42:25 -0500
4310
4311  Avoid clashes with POSIX semantics for zones such as GMT+4.
4312
4313  Some other very minor housekeeping is also present.
4314
4315
4316Release code94c - 1994-02-10 08:52:40 -0500
4317
4318  Fix bug where mkdirs was broken unless you compile with
4319  -fwritable-strings (which is generally losing to do).
4320
4321
4322Release 94b - 1994-02-07 10:04:33 -0500
4323
4324  work by Paul Eggert who notes:
4325
4326  I found another book of time zone histories by E W Whitman; it's not
4327  as extensive as Shanks but has a few goodies of its own.  I used it
4328  to update the tables.  I also fixed some more as a result of
4329  correspondence with Adam David and Peter Ilieve, and move some stray
4330  links from 'europe' to 'backward'.  I corrected some scanning errors
4331  in usno1989.
4332
4333  As far as the code goes, I fixed zic to allow years in the range
4334  INT_MIN to INT_MAX; this fixed a few boundary conditions around 1900.
4335  And I cleaned up the zic documentation a little bit.
4336
4337
4338Release data94a - 1994-02-03 08:58:54 -0500
4339
4340  It simply incorporates the recently announced leap second into the
4341  "leapseconds" file.
4342
4343
4344Release 93g - 1993-11-22 17:28:27 -0500
4345
4346  Paul Eggert has provided a good deal of historic information (based
4347  on Shanks), and there are some code changes to deal with the buglets
4348  that crawled out in dealing with the new information.
4349
4350
4351Release 93f - 1993-10-15 12:27:46 -0400
4352
4353  Paul Eggert's changes
4354
4355
4356Release 93e - 1993-09-05 21:21:44 -0400
4357
4358  This has updated data for Israel, England, and Kwajalein.  There's
4359  also an update to "zdump" to cope with Kwajalein's 24-hour jump.
4360  Thanks to Paul Eggert and Peter Ilieve for the changes.
4361
4362
4363Release 93d - 1993-06-17 23:34:17 -0400
4364
4365  new fix and new data on Israel
4366
4367
4368Release 93c - 1993-06-06 19:31:55 -0400
4369
4370  [not summarized]
4371
4372
4373Release 93b - 1993-02-02 14:53:58 -0500
4374
4375  updated "leapseconds" file
4376
4377
4378Release 93 - 1993-01-08 07:01:06 -0500
4379
4380  At kre's suggestion, the package has been split in two - a code piece
4381  (which also includes documentation) that's only of use to folks who
4382  want to recompile things and a data piece useful to anyone who can
4383  run "zic".
4384
4385  The new version has a few changes to the data files, a few
4386  portability changes, and an off-by-one fix (with thanks to
4387  Tom Karzes at deshaw.com for providing a description and a
4388  solution).
4389
4390
4391Release 92c - 1992-11-21 17:35:36 -0000
4392  [tz92c.tar.Z is missing!]
4393
4394  The fallout from the latest round of DST transitions.
4395
4396  There are changes for Portugal, Saskatchewan, and "Pacific-New";
4397  there's also a change to "zic.c" that makes it portable to more systems.
4398
4399
4400Release 92 - 1992-04-25 18:17:03 -0000
4401  [tz92.tar.Z is missing!]
4402
4403  By popular demand (well, at any rate, following a request by kre at munnari)
4404
4405
4406The 1989 update of the time zone package featured:
4407
4408  *	POSIXization (including interpretation of POSIX-style TZ environment
4409	variables, provided by Guy Harris),
4410  *	ANSIfication (including versions of "mktime" and "difftime"),
4411  *	SVIDulation (an "altzone" variable)
4412  *	MACHination (the "gtime" function)
4413  *	corrections to some time zone data (including corrections to the rules
4414	for Great Britain and New Zealand)
4415  *	reference data from the United States Naval Observatory for folks who
4416	want to do additional time zones
4417  *	and the 1989 data for Saudi Arabia.
4418
4419  (Since this code will be treated as "part of the implementation" in some
4420  places and as "part of the application" in others, there's no good way to
4421  name functions, such as timegm, that are not part of the proposed ANSI C
4422  standard; such functions have kept their old, underscore-free names in this
4423  update.)
4424
4425  And the "dysize" function has disappeared; it was present to allow
4426  compilation of the "date" command on old BSD systems, and a version of "date"
4427  is now provided in the package.  The "date" command is not created when you
4428  "make all" since it may lack options provided by the version distributed with
4429  your operating system, or may not interact with the system in the same way
4430  the native version does.
4431
4432  Since POSIX frowns on correct leap second handling, the default behavior of
4433  the "zic" command (in the absence of a "-L" option) has been changed to omit
4434  leap second information from its output files.
4435
4436
4437-----
4438Notes
4439
4440This file contains copies of the part of each release announcement
4441that talks about the changes in that release.  The text has been
4442adapted and reformatted for the purposes of this file.
4443
4444Traditionally a release R consists of a pair of tarball files,
4445tzcodeR.tar.gz and tzdataR.tar.gz.  However, some releases (e.g.,
4446code2010a, data2012c) consist of just one or the other tarball, and a
4447few (e.g., code2012c-data2012d) have tarballs with mixed version
4448numbers.  Recent releases also come in an experimental format
4449consisting of a single tarball tzdb-R.tar.lz with extra data.
4450
4451Release timestamps are taken from the release's commit (for newer,
4452Git-based releases), from the newest file in the tarball (for older
4453releases, where this info is available) or from the email announcing
4454the release (if all else fails; these are marked with a time zone of
4455-0000 and an "is missing!" comment).
4456
4457Earlier versions of the code and data were not announced on the tz
4458list and are not summarized here.
4459
4460This file is in the public domain.
4461
4462Local Variables:
4463coding: utf-8
4464End:
4465