xref: /freebsd/contrib/tzdata/NEWS (revision b9c36cc755002809a7d7c7109e3425fdfca036d2)
1News for the tz database
2
3Release 2016j - 2016-11-22 23:17:13 -0800
4
5  Briefly: Saratov, Russia moves from +03 to +04 on 2016-12-04.
6
7  Changes to future time stamps
8
9    Saratov, Russia switches from +03 to +04 on 2016-12-04 at 02:00.
10    This hives off a new zone Europe/Saratov from Europe/Volgograd.
11    (Thanks to Yuri Konotopov and Stepan Golosunov.)
12
13  Changes to past time stamps
14
15    The new zone Asia/Atyrau for Atyraū Region, Kazakhstan, is like
16    Asia/Aqtau except it switched from +04/+05 to +05/+06 in spring
17    1999, not fall 1994.  (Thanks to Stepan Golosunov.)
18
19  Changes to past time zone abbreviations
20
21    Asia/Gaza and Asia/Hebron now use "EEST", not "EET", to denote
22    summer time before 1948.  The old use of "EET" was a typo.
23
24  Changes to code
25
26    zic no longer mishandles file systems that lack hard links, fixing
27    bugs introduced in 2016g.  (Problems reported by Tom Lane.)
28    Also, when the destination already contains symbolic links, zic
29    should now work better on systems where the 'link' system call
30    does not follow symbolic links.
31
32  Changes to documentation and commentary
33
34    tz-link.htm now documents the relationship between release version
35    numbers and development-repository commit tags.  (Suggested by
36    Paul Koning.)
37
38    The 'Theory' file now documents UT.
39
40    iso3166.tab now accents "Curaçao", and commentary now mentions
41    the names "Cabo Verde" and "Czechia".  (Thanks to Jiří Boháč.)
42
43
44Release 2016i - 2016-11-01 23:19:52 -0700
45
46  Briefly: Cyprus split into two time zones on 2016-10-30, and Tonga
47  reintroduces DST on 2016-11-06.
48
49  Changes to future time stamps
50
51    Pacific/Tongatapu begins DST on 2016-11-06 at 02:00, ending on
52    2017-01-15 at 03:00.  Assume future observances in Tonga will be
53    from the first Sunday in November through the third Sunday in
54    January, like Fiji.  (Thanks to Pulu ʻAnau.)  Switch to numeric
55    time zone abbreviations for this zone.
56
57  Changes to past and future time stamps
58
59    Northern Cyprus is now +03 year round, causing a split in Cyprus
60    time zones starting 2016-10-30 at 04:00.  This creates a zone
61    Asia/Famagusta.  (Thanks to Even Scharning and Matt Johnson.)
62
63    Antarctica/Casey switched from +08 to +11 on 2016-10-22.
64    (Thanks to Steffen Thorsen.)
65
66  Changes to past time stamps
67
68    Several corrections were made for pre-1975 time stamps in Italy.
69    These affect Europe/Malta, Europe/Rome, Europe/San_Marino, and
70    Europe/Vatican.
71
72    First, the 1893-11-01 00:00 transition in Italy used the new UT
73    offset (+01), not the old (+00:49:56).  (Thanks to Michael
74    Deckers.)
75
76    Second, rules for daylight saving in Italy were changed to agree
77    with Italy's National Institute of Metrological Research (INRiM)
78    except for 1944, as follows (thanks to Pierpaolo Bernardi, Brian
79    Inglis, and Michael Deckers):
80
81      The 1916-06-03 transition was at 24:00, not 00:00.
82
83      The 1916-10-01, 1919-10-05, and 1920-09-19 transitions were at
84      00:00, not 01:00.
85
86      The 1917-09-30 and 1918-10-06 transitions were at 24:00, not
87      01:00.
88
89      The 1944-09-17 transition was at 03:00, not 01:00.  This
90      particular change is taken from Italian law as INRiM's table,
91      (which says 02:00) appears to have a typo here.  Also, keep the
92      1944-04-03 transition for Europe/Rome, as Rome was controlled by
93      Germany then.
94
95      The 1967-1970 and 1972-1974 fallback transitions were at 01:00,
96      not 00:00.
97
98  Changes to code
99
100    The code should now be buildable on AmigaOS merely by setting the
101    appropriate Makefile variables.  (From a patch by Carsten Larsen.)
102
103
104Release 2016h - 2016-10-19 23:17:57 -0700
105
106  Changes to future time stamps
107
108    Asia/Gaza and Asia/Hebron end DST on 2016-10-29 at 01:00, not
109    2016-10-21 at 00:00.  (Thanks to Sharef Mustafa.)  Predict that
110    future fall transitions will be on the last Saturday of October
111    at 01:00, which is consistent with predicted spring transitions
112    on the last Saturday of March.  (Thanks to Tim Parenti.)
113
114  Changes to past time stamps
115
116    In Turkey, transitions in 1986-1990 were at 01:00 standard time
117    not at 02:00, and the spring 1994 transition was on March 20, not
118    March 27.  (Thanks to Kıvanç Yazan.)
119
120  Changes to past and future time zone abbreviations
121
122    Asia/Colombo now uses numeric time zone abbreviations like "+0530"
123    instead of alphabetic ones like "IST" and "LKT".  Various
124    English-language sources use "IST", "LKT" and "SLST", with no
125    working consensus.  (Usage of "SLST" mentioned by Sadika
126    Sumanapala.)
127
128  Changes to code
129
130    zic no longer mishandles relativizing file names when creating
131    symbolic links like /etc/localtime, when these symbolic links
132    are outside the usual directory hierarchy.  This fixes a bug
133    introduced in 2016g.  (Problem reported by Andreas Stieger.)
134
135  Changes to build procedure
136
137    New rules 'traditional_tarballs' and 'traditional_signatures' for
138    building just the traditional-format distribution.  (Requested by
139    Deborah Goldsmith.)
140
141    The file 'version' is now put into the tzdata tarball too.
142    (Requested by Howard Hinnant.)
143
144  Changes to documentation and commentary
145
146    The 'Theory' file now has a section on interface stability.
147    (Requested by Paul Koning.)  It also mentions features like
148    tm_zone and localtime_rz that have long been supported by the
149    reference code.
150
151    tz-link.htm has improved coverage of time zone boundaries suitable
152    for geolocation.  (Thanks to heads-ups from Evan Siroky and Matt
153    Johnson.)
154
155    The US commentary now mentions Allen and the "day of two noons".
156
157    The Fiji commentary mentions the government's 2016-10-03 press
158    release.  (Thanks to Raymond Kumar.)
159
160
161Release 2016g - 2016-09-13 08:56:38 -0700
162
163  Changes to future time stamps
164
165    Turkey switched from EET/EEST (+02/+03) to permanent +03,
166    effective 2016-09-07.  (Thanks to Burak AYDIN.)  Use "+03" rather
167    than an invented abbreviation for the new time.
168
169    New leap second 2016-12-31 23:59:60 UTC as per IERS Bulletin C 52.
170    (Thanks to Tim Parenti.)
171
172  Changes to past time stamps
173
174    For America/Los_Angeles, spring-forward transition times have been
175    corrected from 02:00 to 02:01 in 1948, and from 02:00 to 01:00 in
176    1950-1966.
177
178    For zones using Soviet time on 1919-07-01, transitions to UT-based
179    time were at 00:00 UT, not at 02:00 local time.  The affected
180    zones are Europe/Kirov, Europe/Moscow, Europe/Samara, and
181    Europe/Ulyanovsk.  (Thanks to Alexander Belopolsky.)
182
183  Changes to past and future time zone abbreviations
184
185    The Factory zone now uses the time zone abbreviation -00 instead
186    of a long English-language string, as -00 is now the normal way to
187    represent an undefined time zone.
188
189    Several zones in Antarctica and the former Soviet Union, along
190    with zones intended for ships at sea that cannot use POSIX TZ
191    strings, now use numeric time zone abbreviations instead of
192    invented or obsolete alphanumeric abbreviations.  The affected
193    zones are Antarctica/Casey, Antarctica/Davis,
194    Antarctica/DumontDUrville, Antarctica/Mawson, Antarctica/Rothera,
195    Antarctica/Syowa, Antarctica/Troll, Antarctica/Vostok,
196    Asia/Anadyr, Asia/Ashgabat, Asia/Baku, Asia/Bishkek, Asia/Chita,
197    Asia/Dushanbe, Asia/Irkutsk, Asia/Kamchatka, Asia/Khandyga,
198    Asia/Krasnoyarsk, Asia/Magadan, Asia/Omsk, Asia/Sakhalin,
199    Asia/Samarkand, Asia/Srednekolymsk, Asia/Tashkent, Asia/Tbilisi,
200    Asia/Ust-Nera, Asia/Vladivostok, Asia/Yakutsk, Asia/Yekaterinburg,
201    Asia/Yerevan, Etc/GMT-14, Etc/GMT-13, Etc/GMT-12, Etc/GMT-11,
202    Etc/GMT-10, Etc/GMT-9, Etc/GMT-8, Etc/GMT-7, Etc/GMT-6, Etc/GMT-5,
203    Etc/GMT-4, Etc/GMT-3, Etc/GMT-2, Etc/GMT-1, Etc/GMT+1, Etc/GMT+2,
204    Etc/GMT+3, Etc/GMT+4, Etc/GMT+5, Etc/GMT+6, Etc/GMT+7, Etc/GMT+8,
205    Etc/GMT+9, Etc/GMT+10, Etc/GMT+11, Etc/GMT+12, Europe/Kaliningrad,
206    Europe/Minsk, Europe/Samara, Europe/Volgograd, and
207    Indian/Kerguelen.  For Europe/Moscow the invented abbreviation MSM
208    was replaced by +05, whereas MSK and MSD were kept as they are not
209    our invention and are widely used.
210
211  Changes to zone names
212
213    Rename Asia/Rangoon to Asia/Yangon, with a backward compatibility link.
214    (Thanks to David Massoud.)
215
216  Changes to code
217
218    zic no longer generates binary files containing POSIX TZ-like
219    strings that disagree with the local time type after the last
220    explicit transition in the data.  This fixes a bug with
221    Africa/Casablanca and Africa/El_Aaiun in some year-2037 time
222    stamps on the reference platform.  (Thanks to Alexander Belopolsky
223    for reporting the bug and suggesting a way forward.)
224
225    If the installed localtime and/or posixrules files are symbolic
226    links, zic now keeps them symbolic links when updating them, for
227    compatibility with platforms like OpenSUSE where other programs
228    configure these files as symlinks.
229
230    zic now avoids hard linking to symbolic links, avoids some
231    unnecessary mkdir and stat system calls, and uses shorter file
232    names internally.
233
234    zdump has a new -i option to generate transitions in a
235    more-compact but still human-readable format.  This option is
236    experimental, and the output format may change in future versions.
237    (Thanks to Jon Skeet for suggesting that an option was needed,
238    and thanks to Tim Parenti and Chris Rovick for further comments.)
239
240  Changes to build procedure
241
242    An experimental distribution format is available, in addition
243    to the traditional format which will continue to be distributed.
244    The new format is a tarball tzdb-VERSION.tar.lz with signature
245    file tzdb-VERSION.tar.lz.asc.  It unpacks to a top-level directory
246    tzdb-VERSION containing the code and data of the traditional
247    two-tarball format, along with extra data that may be useful.
248    (Thanks to Antonio Diaz Diaz, Oscar van Vlijmen, and many others
249    for comments about the experimental format.)
250
251    The release version number is now more accurate in the usual case
252    where releases are built from a Git repository.  For example, if
253    23 commits and some working-file changes have been made since
254    release 2016g, the version number is now something like
255    '2016g-23-g50556e3-dirty' instead of the misleading '2016g'.
256    Tagged releases use the same version number format as before,
257    e.g., '2016g'.  To support the more-accurate version number, its
258    specification has moved from a line in the Makefile to a new
259    source file 'version'.
260
261    The experimental distribution contains a file to2050.tzs that
262    contains what should be the output of 'zdump -i -c 2050' on
263    primary zones.  If this file is available, 'make check' now checks
264    that zdump generates this output.
265
266    'make check_web' now works on Fedora-like distributions.
267
268  Changes to documentation and commentary
269
270    tzfile.5 now documents the new restriction on POSIX TZ-like
271    strings that is now implemented by zic.
272
273    Comments now cite URLs for some 1917-1921 Russian DST decrees.
274    (Thanks to Alexander Belopolsky.)
275
276    tz-link.htm mentions JuliaTime (thanks to Curtis Vogt) and Time4J
277    (thanks to Meno Hochschild) and ThreeTen-Extra, and its
278    description of Java 8 has been brought up to date (thanks to
279    Stephen Colebourne).  Its description of local time on Mars has
280    been updated to match current practice, and URLs have been updated
281    and some obsolete ones removed.
282
283
284Release 2016f - 2016-07-05 16:26:51 +0200
285
286  Changes affecting future time stamps
287
288    The Egyptian government changed its mind on short notice, and
289    Africa/Cairo will not introduce DST starting 2016-07-07 after all.
290    (Thanks to Mina Samuel.)
291
292    Asia/Novosibirsk switches from +06 to +07 on 2016-07-24 at 02:00.
293    (Thanks to Stepan Golosunov.)
294
295  Changes to past and future time stamps
296
297    Asia/Novokuznetsk and Asia/Novosibirsk now use numeric time zone
298    abbreviations instead of invented ones.
299
300  Changes affecting past time stamps
301
302    Europe/Minsk's 1992-03-29 spring-forward transition was at 02:00 not 00:00.
303    (Thanks to Stepan Golosunov.)
304
305
306Release 2016e - 2016-06-14 08:46:16 -0700
307
308  Changes affecting future time stamps
309
310    Africa/Cairo observes DST in 2016 from July 7 to the end of October.
311    Guess October 27 and 24:00 transitions.  (Thanks to Steffen Thorsen.)
312    For future years, guess April's last Thursday to October's last
313    Thursday except for Ramadan.
314
315  Changes affecting past time stamps
316
317    Locations while uninhabited now use '-00', not 'zzz', as a
318    placeholder time zone abbreviation.  This is inspired by Internet
319    RFC 3339 and is more consistent with numeric time zone
320    abbreviations already used elsewhere.  The change affects several
321    arctic and antarctic locations, e.g., America/Cambridge_Bay before
322    1920 and Antarctica/Troll before 2005.
323
324    Asia/Baku's 1992-09-27 transition from +04 (DST) to +04 (non-DST) was
325    at 03:00, not 23:00 the previous day.  (Thanks to Michael Deckers.)
326
327  Changes to code
328
329    zic now outputs a dummy transition at time 2**31 - 1 in zones
330    whose POSIX-style TZ strings contain a '<'.  This mostly works
331    around Qt bug 53071 <https://bugreports.qt.io/browse/QTBUG-53071>.
332    (Thanks to Zhanibek Adilbekov for reporting the Qt bug.)
333
334  Changes affecting documentation and commentary
335
336    tz-link.htm says why governments should give plenty of notice for
337    time zone or DST changes, and refers to Matt Johnson's blog post.
338
339    tz-link.htm mentions Tzdata for Elixir.  (Thanks to Matt Johnson.)
340
341
342Release 2016d - 2016-04-17 22:50:29 -0700
343
344  Changes affecting future time stamps
345
346    America/Caracas switches from -0430 to -04 on 2016-05-01 at 02:30.
347    (Thanks to Alexander Krivenyshev for the heads-up.)
348
349    Asia/Magadan switches from +10 to +11 on 2016-04-24 at 02:00.
350    (Thanks to Alexander Krivenyshev and Matt Johnson.)
351
352    New zone Asia/Tomsk, split off from Asia/Novosibirsk.  It covers
353    Tomsk Oblast, Russia, which switches from +06 to +07 on 2016-05-29
354    at 02:00.  (Thanks to Stepan Golosunov.)
355
356  Changes affecting past time stamps
357
358    New zone Europe/Kirov, split off from Europe/Volgograd.  It covers
359    Kirov Oblast, Russia, which switched from +04/+05 to +03/+04 on
360    1989-03-26 at 02:00, roughly a year after Europe/Volgograd made
361    the same change.  (Thanks to Stepan Golosunov.)
362
363    Russia and nearby locations had daylight-saving transitions on
364    1992-03-29 at 02:00 and 1992-09-27 at 03:00, instead of on
365    1992-03-28 at 23:00 and 1992-09-26 at 23:00.  (Thanks to Stepan
366    Golosunov.)
367
368    Many corrections to historical time in Kazakhstan from 1991
369    through 2005.  (Thanks to Stepan Golosunov.)  Replace Kazakhstan's
370    invented time zone abbreviations with numeric abbreviations.
371
372  Changes to commentary
373
374    Mention Internet RFCs 7808 (TZDIST) and 7809 (CalDAV time zone references).
375
376
377Release 2016c - 2016-03-23 00:51:27 -0700
378
379  Changes affecting future time stamps
380
381    Azerbaijan no longer observes DST.  (Thanks to Steffen Thorsen.)
382
383    Chile reverts from permanent to seasonal DST.  (Thanks to Juan
384    Correa for the heads-up, and to Tim Parenti for corrections.)
385    Guess that future transitions are August's and May's second
386    Saturdays at 24:00 mainland time.  Also, call the period from
387    2014-09-07 through 2016-05-14 daylight saving time instead of
388    standard time, as that seems more appropriate now.
389
390  Changes affecting past time stamps
391
392    Europe/Kaliningrad and Europe/Vilnius changed from +03/+04 to
393    +02/+03 on 1989-03-26, not 1991-03-31.  Europe/Volgograd changed
394    from +04/+05 to +03/+04 on 1988-03-27, not 1989-03-26.
395    (Thanks to Stepan Golosunov.)
396
397  Changes to commentary
398
399    Several updates and URLs for historical and proposed Russian changes.
400    (Thanks to Stepan Golosunov, Matt Johnson, and Alexander Krivenyshev.)
401
402
403Release 2016b - 2016-03-12 17:30:14 -0800
404
405  Compatibility note
406
407    Starting with release 2016b, some data entries cause zic implementations
408    derived from tz releases 2005j through 2015e to issue warnings like
409    "time zone abbreviation differs from POSIX standard (+03)".
410    These warnings should not otherwise affect zic's output and can safely be
411    ignored on today's platforms, as the warnings refer to a restriction in
412    POSIX.1-1988 that was removed in POSIX.1-2001.  One way to suppress the
413    warnings is to upgrade to zic derived from tz releases 2015f and later.
414
415  Changes affecting future time stamps
416
417    New zones Europe/Astrakhan and Europe/Ulyanovsk for Astrakhan and
418    Ulyanovsk Oblasts, Russia, both of which will switch from +03 to +04 on
419    2016-03-27 at 02:00 local time.  They need distinct zones since their
420    post-1970 histories disagree.  New zone Asia/Barnaul for Altai Krai and
421    Altai Republic, Russia, which will switch from +06 to +07 on the same date
422    and local time.  The Astrakhan change is already official; the others have
423    passed the first reading in the State Duma and are extremely likely.
424    Also, Asia/Sakhalin moves from +10 to +11 on 2016-03-27 at 02:00.
425    (Thanks to Alexander Krivenyshev for the heads-up, and to Matt Johnson
426    and Stepan Golosunov for followup.)
427
428    As a trial of a new system that needs less information to be made up,
429    the new zones use numeric time zone abbreviations like "+04"
430    instead of invented abbreviations like "ASTT".
431
432    Haiti will not observe DST in 2016.  (Thanks to Jean Antoine via
433    Steffen Thorsen.)
434
435    Palestine's spring-forward transition on 2016-03-26 is at 01:00, not 00:00.
436    (Thanks to Hannah Kreitem.) Guess future transitions will be March's last
437    Saturday at 01:00, not March's last Friday at 24:00.
438
439  Changes affecting past time stamps
440
441    Europe/Chisinau observed DST during 1990, and switched from +04 to
442    +03 at 1990-05-06 02:00, instead of switching from +03 to +02.
443    (Thanks to Stepan Golosunov.)
444
445    1991 abbreviations in Europe/Samara should be SAMT/SAMST, not
446    KUYT/KUYST.  (Thanks to Stepan Golosunov.)
447
448  Changes to code
449
450    tzselect's diagnostics and checking, and checktab.awk's checking,
451    have been improved.  (Thanks to J William Piggott.)
452
453    tzcode now builds under MinGW.  (Thanks to Ian Abbott and Esben Haabendal.)
454
455    tzselect now tests Julian-date TZ settings more accurately.
456    (Thanks to J William Piggott.)
457
458  Changes to commentary
459
460    Comments in zone tables have been improved.  (Thanks to J William Piggott.)
461
462    tzselect again limits its menu comments so that menus fit on a
463    24x80 alphanumeric display.
464
465    A new web page tz-how-to.html.  (Thanks to Bill Seymour.)
466
467    In the Theory file, the description of possible time zone abbreviations in
468    tzdata has been cleaned up, as the old description was unclear and
469    inconsistent.  (Thanks to Alain Mouette for reporting the problem.)
470
471
472Release 2016a - 2016-01-26 23:28:02 -0800
473
474  Changes affecting future time stamps
475
476    America/Cayman will not observe daylight saving this year after all.
477    Revert our guess that it would.  (Thanks to Matt Johnson.)
478
479    Asia/Chita switches from +0800 to +0900 on 2016-03-27 at 02:00.
480    (Thanks to Alexander Krivenyshev.)
481
482    Asia/Tehran now has DST predictions for the year 2038 and later,
483    to be March 21 00:00 to September 21 00:00.  This is likely better
484    than predicting no DST, albeit off by a day every now and then.
485
486  Changes affecting past and future time stamps
487
488    America/Metlakatla switched from PST all year to AKST/AKDT on
489    2015-11-01 at 02:00.  (Thanks to Steffen Thorsen.)
490
491    America/Santa_Isabel has been removed, and replaced with a
492    backward compatibility link to America/Tijuana.  Its contents were
493    apparently based on a misreading of Mexican legislation.
494
495  Changes affecting past time stamps
496
497    Asia/Karachi's two transition times in 2002 were off by a minute.
498    (Thanks to Matt Johnson.)
499
500  Changes affecting build procedure
501
502    An installer can now combine leap seconds with use of the backzone file,
503    e.g., with 'make PACKRATDATA=backzone REDO=posix_right zones'.
504    The old 'make posix_packrat' rule is now marked as obsolescent.
505    (Thanks to Ian Abbott for an initial implementation.)
506
507  Changes affecting documentation and commentary
508
509    A new file LICENSE makes it easier to see that the code and data
510    are mostly public-domain.  (Thanks to James Knight.)  The three
511    non-public-domain files now use the current (3-clause) BSD license
512    instead of older versions of that license.
513
514    tz-link.htm mentions the BDE library (thanks to Andrew Paprocki),
515    CCTZ (thanks to Tim Parenti), TimeJones.com, and has a new section
516    on editing tz source files (with a mention of Sublime zoneinfo,
517    thanks to Gilmore Davidson).
518
519    The Theory and asia files now mention the 2015 book "The Global
520    Transformation of Time, 1870-1950", and cite a couple of reviews.
521
522    The America/Chicago entry now documents the informal use of US
523    central time in Fort Pierre, South Dakota.  (Thanks to Rick
524    McDermid, Matt Johnson, and Steve Jones.)
525
526
527Release 2015g - 2015-10-01 00:39:51 -0700
528
529  Changes affecting future time stamps
530
531    Turkey's 2015 fall-back transition is scheduled for Nov. 8, not Oct. 25.
532    (Thanks to Fatih.)
533
534    Norfolk moves from +1130 to +1100 on 2015-10-04 at 02:00 local time.
535    (Thanks to Alexander Krivenyshev.)
536
537    Fiji's 2016 fall-back transition is scheduled for January 17, not 24.
538    (Thanks to Ken Rylander.)
539
540    Fort Nelson, British Columbia will not fall back on 2015-11-01.  It has
541    effectively been on MST (-0700) since it advanced its clocks on 2015-03-08.
542    New zone America/Fort_Nelson.  (Thanks to Matt Johnson.)
543
544  Changes affecting past time stamps
545
546    Norfolk observed DST from 1974-10-27 02:00 to 1975-03-02 02:00.
547
548  Changes affecting code
549
550    localtime no longer mishandles America/Anchorage after 2037.
551    (Thanks to Bradley White for reporting the bug.)
552
553    On hosts with signed 32-bit time_t, localtime no longer mishandles
554    Pacific/Fiji after 2038-01-16 14:00 UTC.
555
556    The localtime module allows the variables 'timezone', 'daylight',
557    and 'altzone' to be in common storage shared with other modules,
558    and declares them in case the system <time.h> does not.
559    (Problems reported by Kees Dekker.)
560
561    On platforms with tm_zone, strftime.c now assumes it is not NULL.
562    This simplifies the code and is consistent with zdump.c.
563    (Problem reported by Christos Zoulas.)
564
565  Changes affecting documentation
566
567   The tzfile man page now documents that transition times denote the
568   starts (not the ends) of the corresponding time periods.
569   (Ambiguity reported by Bill Seymour.)
570
571
572Release 2015f - 2015-08-10 18:06:56 -0700
573
574  Changes affecting future time stamps
575
576    North Korea switches to +0830 on 2015-08-15.  (Thanks to Steffen Thorsen.)
577    The abbreviation remains "KST".  (Thanks to Robert Elz.)
578
579    Uruguay no longer observes DST.  (Thanks to Steffen Thorsen
580    and Pablo Camargo.)
581
582  Changes affecting past and future time stamps
583
584    Moldova starts and ends DST at 00:00 UTC, not at 01:00 UTC.
585    (Thanks to Roman Tudos.)
586
587  Changes affecting data format and code
588
589    zic's '-y YEARISTYPE' option is no longer documented.  The TYPE
590    field of a Rule line should now be '-'; the old values 'even',
591    'odd', 'uspres', 'nonpres', 'nonuspres' were already undocumented.
592    Although the implementation has not changed, these features do not
593    work in the default installation, they are not used in the data,
594    and they are now considered obsolescent.
595
596    zic now checks that two rules don't take effect at the same time.
597    (Thanks to Jon Skeet and Arthur David Olson.)  Constraints on
598    simultaneity are now documented.
599
600    The two characters '%z' in a zone format now stand for the UTC
601    offset, e.g., '-07' for seven hours behind UTC and '+0530' for
602    five hours and thirty minutes ahead.  This better supports time
603    zone abbreviations conforming to POSIX.1-2001 and later.
604
605  Changes affecting installed data files
606
607    Comments for America/Halifax and America/Glace_Bay have been improved.
608    (Thanks to Brian Inglis.)
609
610    Data entries have been simplified for Atlantic/Canary, Europe/Simferopol,
611    Europe/Sofia, and Europe/Tallinn.  This yields slightly smaller
612    installed data files for Europe/Simferopol and Europe/Tallinn.
613    It does not affect timestamps.  (Thanks to Howard Hinnant.)
614
615  Changes affecting code
616
617    zdump and zic no longer warn about valid time zone abbreviations
618    like '-05'.
619
620    Some Visual Studio 2013 warnings have been suppressed.
621    (Thanks to Kees Dekker.)
622
623    'date' no longer sets the time of day and its -a, -d, -n and -t
624    options have been removed.  Long obsolescent, the implementation
625    of these features had porting problems.  Builders no longer need
626    to configure HAVE_ADJTIME, HAVE_SETTIMEOFDAY, or HAVE_UTMPX_H.
627    (Thanks to Kees Dekker for pointing out the problem.)
628
629  Changes affecting documentation
630
631    The Theory file mentions naming issues earlier, as these seem to be
632    poorly publicized (thanks to Gilmore Davidson for reporting the problem).
633
634    tz-link.htm mentions Time Zone Database Parser (thanks to Howard Hinnant).
635
636    Mention that Herbert Samuel introduced the term "Summer Time".
637
638
639Release 2015e - 2015-06-13 10:56:02 -0700
640
641  Changes affecting future time stamps
642
643    Morocco will suspend DST from 2015-06-14 03:00 through 2015-07-19 02:00,
644    not 06-13 and 07-18 as we had guessed.  (Thanks to Milamber.)
645
646    Assume Cayman Islands will observe DST starting next year, using US rules.
647    Although it isn't guaranteed, it is the most likely.
648
649  Changes affecting data format
650
651    The file 'iso3166.tab' now uses UTF-8, so that its entries can better
652    spell the names of Åland Islands, Côte d'Ivoire, and Réunion.
653
654  Changes affecting code
655
656    When displaying data, tzselect converts it to the current locale's
657    encoding if the iconv command works.  (Problem reported by random832.)
658
659    tzselect no longer mishandles Dominica, fixing a bug introduced
660    in Release 2014f.  (Problem reported by Owen Leibman.)
661
662    zic -l no longer fails when compiled with -DTZDEFAULT=\"/etc/localtime\".
663    This fixes a bug introduced in Release 2014f.
664    (Problem reported by Leonardo Chiquitto.)
665
666
667Release 2015d - 2015-04-24 08:09:46 -0700
668
669  Changes affecting future time stamps
670
671    Egypt will not observe DST in 2015 and will consider canceling it
672    permanently.  For now, assume no DST indefinitely.
673    (Thanks to Ahmed Nazmy and Tim Parenti.)
674
675  Changes affecting past time stamps
676
677    America/Whitehorse switched from UT -09 to -08 on 1967-05-28, not
678    1966-07-01.  Also, Yukon's time zone history is documented better.
679    (Thanks to Brian Inglis and Dennis Ferguson.)
680
681  Change affecting past and future time zone abbreviations
682
683    The abbreviations for Hawaii-Aleutian standard and daylight times
684    have been changed from HAST/HADT to HST/HDT, as per US Government
685    Printing Office style.  This affects only America/Adak since 1983,
686    as America/Honolulu was already using the new style.
687
688  Changes affecting code
689
690   zic has some minor performance improvements.
691
692
693Release 2015c - 2015-04-11 08:55:55 -0700
694
695  Changes affecting future time stamps
696
697    Egypt's spring-forward transition is at 24:00 on April's last Thursday,
698    not 00:00 on April's last Friday.  2015's transition will therefore be on
699    Thursday, April 30 at 24:00, not Friday, April 24 at 00:00.  Similar fixes
700    apply to 2026, 2037, 2043, etc.  (Thanks to Steffen Thorsen.)
701
702  Changes affecting past time stamps
703
704    The following changes affect some pre-1991 Chile-related time stamps
705    in America/Santiago, Antarctica/Palmer, and Pacific/Easter.
706
707      The 1910 transition was January 10, not January 1.
708
709      The 1918 transition was September 10, not September 1.
710
711      The UT -04 time observed from 1932 to 1942 is now considered to
712      be standard time, not year-round DST.
713
714      Santiago observed DST (UT -03) from 1946-07-15 through
715      1946-08-31, then reverted to standard time, then switched to -05
716      on 1947-04-01.
717
718      Assume transitions before 1968 were at 00:00, since we have no data
719      saying otherwise.
720
721      The spring 1988 transition was 1988-10-09, not 1988-10-02.
722      The fall 1990 transition was 1990-03-11, not 1990-03-18.
723
724      Assume no UTC offset change for Pacific/Easter on 1890-01-01,
725      and omit all transitions on Pacific/Easter from 1942 through 1946
726      since we have no data suggesting that they existed.
727
728    One more zone has been turned into a link, as it differed
729    from an existing zone only for older time stamps.  As usual,
730    this change affects UTC offsets in pre-1970 time stamps only.
731    The zone's old contents have been moved to the 'backzone' file.
732    The affected zone is America/Montreal.
733
734  Changes affecting commentary
735
736    Mention the TZUpdater tool.
737
738    Mention "The Time Now".  (Thanks to Brandon Ramsey.)
739
740
741Release 2015b - 2015-03-19 23:28:11 -0700
742
743  Changes affecting future time stamps
744
745    Mongolia will start observing DST again this year, from the last
746    Saturday in March at 02:00 to the last Saturday in September at 00:00.
747    (Thanks to Ganbold Tsagaankhuu.)
748
749    Palestine will start DST on March 28, not March 27.  Also,
750    correct the fall 2014 transition from September 26 to October 24.
751    Adjust future predictions accordingly.  (Thanks to Steffen Thorsen.)
752
753  Changes affecting past time stamps
754
755    The 1982 zone shift in Pacific/Easter has been corrected, fixing a 2015a
756    regression.  (Thanks to Stuart Bishop for reporting the problem.)
757
758    Some more zones have been turned into links, when they differed
759    from existing zones only for older time stamps.  As usual,
760    these changes affect UTC offsets in pre-1970 time stamps only.
761    Their old contents have been moved to the 'backzone' file.
762    The affected zones are: America/Antigua, America/Cayman,
763    Pacific/Midway, and Pacific/Saipan.
764
765  Changes affecting time zone abbreviations
766
767    Correct the 1992-2010 DST abbreviation in Volgograd from "MSK" to "MSD".
768    (Thanks to Hank W.)
769
770  Changes affecting code
771
772    Fix integer overflow bug in reference 'mktime' implementation.
773    (Problem reported by Jörg Richter.)
774
775    Allow -Dtime_tz=time_t compilations, and allow -Dtime_tz=... libraries
776    to be used in the same executable as standard-library time_t functions.
777    (Problems reported by Bradley White.)
778
779  Changes affecting commentary
780
781    Cite the recent Mexican decree changing Quintana Roo's time zone.
782    (Thanks to Carlos Raúl Perasso.)
783
784    Likewise for the recent Chilean decree.  (Thanks to Eduardo Romero Urra.)
785
786    Update info about Mars time.
787
788
789Release 2015a - 2015-01-29 22:35:20 -0800
790
791  Changes affecting future time stamps
792
793    The Mexican state of Quintana Roo, represented by America/Cancun,
794    will shift from Central Time with DST to Eastern Time without DST
795    on 2015-02-01 at 02:00.  (Thanks to Steffen Thorsen and Gwillim Law.)
796
797    Chile will not change clocks in April or thereafter; its new standard time
798    will be its old daylight saving time.  This affects America/Santiago,
799    Pacific/Easter, and Antarctica/Palmer.  (Thanks to Juan Correa.)
800
801    New leap second 2015-06-30 23:59:60 UTC as per IERS Bulletin C 49.
802    (Thanks to Tim Parenti.)
803
804  Changes affecting past time stamps
805
806    Iceland observed DST in 1919 and 1921, and its 1939 fallback
807    transition was Oct. 29, not Nov. 29.  Remove incorrect data from
808    Shanks about time in Iceland between 1837 and 1908.
809
810    Some more zones have been turned into links, when they differed
811    from existing zones only for older time stamps.  As usual,
812    these changes affect UTC offsets in pre-1970 time stamps only.
813    Their old contents have been moved to the 'backzone' file.
814    The affected zones are: Asia/Aden, Asia/Bahrain, Asia/Kuwait,
815    and Asia/Muscat.
816
817  Changes affecting code
818
819    tzalloc now scrubs time zone abbreviations compatibly with the way
820    that tzset always has, by replacing invalid bytes with '_' and by
821    shortening too-long abbreviations.
822
823    tzselect ports to POSIX awk implementations, no longer mishandles
824    POSIX TZ settings when GNU awk is used, and reports POSIX TZ
825    settings to the user.  (Thanks to Stefan Kuhn.)
826
827  Changes affecting build procedure
828
829    'make check' now checks for links to links in the data.
830    One such link (for Africa/Asmera) has been fixed.
831    (Thanks to Stephen Colebourne for pointing out the problem.)
832
833  Changes affecting commentary
834
835    The leapseconds file commentary now mentions the expiration date.
836    (Problem reported by Martin Burnicki.)
837
838    Update Mexican Library of Congress URL.
839
840
841Release 2014j - 2014-11-10 17:37:11 -0800
842
843  Changes affecting current and future time stamps
844
845    Turks & Caicos' switch from US eastern time to UT -04 year-round
846    did not occur on 2014-11-02 at 02:00.  It's currently scheduled
847    for 2015-11-01 at 02:00.  (Thanks to Chris Walton.)
848
849  Changes affecting past time stamps
850
851    Many pre-1989 time stamps have been corrected for Asia/Seoul and
852    Asia/Pyongyang, based on sources for the Korean-language Wikipedia
853    entry for time in Korea.  (Thanks to Sanghyuk Jung.)  Also, no
854    longer guess that Pyongyang mimicked Seoul time after World War II,
855    as this is politically implausible.
856
857    Some more zones have been turned into links, when they differed
858    from existing zones only for older time stamps.  As usual,
859    these changes affect UTC offsets in pre-1970 time stamps only.
860    Their old contents have been moved to the 'backzone' file.
861    The affected zones are: Africa/Addis_Ababa, Africa/Asmara,
862    Africa/Dar_es_Salaam, Africa/Djibouti, Africa/Kampala,
863    Africa/Mogadishu, Indian/Antananarivo, Indian/Comoro, and
864    Indian/Mayotte.
865
866  Changes affecting commentary
867
868    The commentary is less enthusiastic about Shanks as a source,
869    and is more careful to distinguish UT from UTC.
870
871
872Release 2014i - 2014-10-21 22:04:57 -0700
873
874  Changes affecting future time stamps
875
876    Pacific/Fiji will observe DST from 2014-11-02 02:00 to 2015-01-18 03:00.
877    (Thanks to Ken Rylander for the heads-up.)  Guess that future
878    years will use a similar pattern.
879
880    A new Zone Pacific/Bougainville, for the part of Papua New Guinea
881    that plans to switch from UT +10 to +11 on 2014-12-28 at 02:00.
882    (Thanks to Kiley Walbom for the heads-up.)
883
884  Changes affecting time zone abbreviations
885
886    Since Belarus is not changing its clocks even though Moscow is,
887    the time zone abbreviation in Europe/Minsk is changing from FET
888    to its more-traditional value MSK on 2014-10-26 at 01:00.
889    (Thanks to Alexander Bokovoy for the heads-up about Belarus.)
890
891    The new abbreviation IDT stands for the pre-1976 use of UT +08 in
892    Indochina, to distinguish it better from ICT (+07).
893
894  Changes affecting past time stamps
895
896    Many time stamps have been corrected for Asia/Ho_Chi_Minh before 1976
897    (thanks to Trần Ngọc Quân for an indirect pointer to Trần Tiến Bình's
898    authoritative book).  Asia/Ho_Chi_Minh has been added to
899    zone1970.tab, to give tzselect users in Vietnam two choices,
900    since north and south Vietnam disagreed after our 1970 cutoff.
901
902    Asia/Phnom_Penh and Asia/Vientiane have been turned into links, as
903    they differed from existing zones only for older time stamps.  As
904    usual, these changes affect pre-1970 time stamps only.  Their old
905    contents have been moved to the 'backzone' file.
906
907  Changes affecting code
908
909    The time-related library functions now set errno on failure, and
910    some crashes in the new tzalloc-related library functions have
911    been fixed.  (Thanks to Christos Zoulas for reporting most of
912    these problems and for suggesting fixes.)
913
914    If USG_COMPAT is defined and the requested time stamp is standard time,
915    the tz library's localtime and mktime functions now set the extern
916    variable timezone to a value appropriate for that time stamp; and
917    similarly for ALTZONE, daylight saving time, and the altzone variable.
918    This change is a companion to the tzname change in 2014h, and is
919    designed to make timezone and altzone more compatible with tzname.
920
921    The tz library's functions now set errno to EOVERFLOW if they fail
922    because the result cannot be represented.  ctime and ctime_r now
923    return NULL and set errno when a time stamp is out of range, rather
924    than having undefined behavior.
925
926    Some bugs associated with the new 2014g functions have been fixed.
927    This includes a bug that largely incapacitated the new functions
928    time2posix_z and posix2time_z.  (Thanks to Christos Zoulas.)
929    It also includes some uses of uninitialized variables after tzalloc.
930    The new code uses the standard type 'ssize_t', which the Makefile
931    now gives porting advice about.
932
933  Changes affecting commentary
934
935    Updated URLs for NRC Canada (thanks to Matt Johnson and Brian Inglis).
936
937
938Release 2014h - 2014-09-25 18:59:03 -0700
939
940  Changes affecting past time stamps
941
942    America/Jamaica's 1974 spring-forward transition was Jan. 6, not Apr. 28.
943
944    Shanks says Asia/Novokuznetsk switched from LMT (not "NMT") on 1924-05-01,
945    not 1920-01-06.  The old entry was based on a misinterpretation of Shanks.
946
947    Some more zones have been turned into links, when they differed
948    from existing zones only for older time stamps.  As usual,
949    these changes affect UTC offsets in pre-1970 time stamps only.
950    Their old contents have been moved to the 'backzone' file.
951    The affected zones are: Africa/Blantyre, Africa/Bujumbura,
952    Africa/Gaborone, Africa/Harare, Africa/Kigali, Africa/Lubumbashi,
953    Africa/Lusaka, Africa/Maseru, and Africa/Mbabane.
954
955  Changes affecting code
956
957    zdump -V and -v now output gmtoff= values on all platforms,
958    not merely on platforms defining TM_GMTOFF.
959
960    The tz library's localtime and mktime functions now set tzname to a value
961    appropriate for the requested time stamp, and zdump now uses this
962    on platforms not defining TM_ZONE, fixing a 2014g regression.
963    (Thanks to Tim Parenti for reporting the problem.)
964
965    The tz library no longer sets tzname if localtime or mktime fails.
966
967    zdump -c no longer mishandles transitions near year boundaries.
968    (Thanks to Tim Parenti for reporting the problem.)
969
970    An access to uninitialized data has been fixed.
971    (Thanks to Jörg Richter for reporting the problem.)
972
973    When THREAD_SAFE is defined, the code ports to the C11 memory model.
974    A memory leak has been fixed if ALL_STATE and THREAD_SAFE are defined
975    and two threads race to initialize data used by gmtime-like functions.
976    (Thanks to Andy Heninger for reporting the problems.)
977
978  Changes affecting build procedure
979
980    'make check' now checks better for properly-sorted data.
981
982  Changes affecting documentation and commentary
983
984    zdump's gmtoff=N output is now documented, and its isdst=D output
985    is now documented to possibly output D values other than 0 or 1.
986
987    zdump -c's treatment of years is now documented to use the
988    Gregorian calendar and Universal Time without leap seconds,
989    and its behavior at cutoff boundaries is now documented better.
990    (Thanks to Arthur David Olson and Tim Parenti for reporting the problems.)
991
992    Programs are now documented to use the proleptic Gregorian calendar.
993    (Thanks to Alan Barrett for the suggestion.)
994
995    Fractional-second GMT offsets have been documented for civil time
996    in 19th-century Chennai, Jakarta, and New York.
997
998
999Release 2014g - 2014-08-28 12:31:23 -0700
1000
1001  Changes affecting future time stamps
1002
1003    Turks & Caicos is switching from US eastern time to UT -04
1004    year-round, modeled as a switch on 2014-11-02 at 02:00.
1005    [As noted in 2014j, this switch was later delayed.]
1006
1007  Changes affecting past time stamps
1008
1009    Time in Russia or the USSR before 1926 or so has been corrected by
1010    a few seconds in the following zones: Asia/Irkutsk,
1011    Asia/Krasnoyarsk, Asia/Omsk, Asia/Samarkand, Asia/Tbilisi,
1012    Asia/Vladivostok, Asia/Yakutsk, Europe/Riga, Europe/Samara.  For
1013    Asia/Yekaterinburg the correction is a few minutes.  (Thanks to
1014    Vladimir Karpinsky.)
1015
1016    The Portuguese decree of 1911-05-26 took effect on 1912-01-01.
1017    This affects 1911 time stamps in Africa/Bissau, Africa/Luanda,
1018    Atlantic/Azores, and Atlantic/Madeira.  Also, Lisbon's pre-1912
1019    GMT offset was -0:36:45 (rounded from -0:36:44.68), not -0:36:32.
1020    (Thanks to Stephen Colebourne for pointing to the decree.)
1021
1022    Asia/Dhaka ended DST on 2009-12-31 at 24:00, not 23:59.
1023
1024    A new file 'backzone' contains data which may appeal to
1025    connoisseurs of old time stamps, although it is out of scope for
1026    the tz database, is often poorly sourced, and contains some data
1027    that is known to be incorrect.  The new file is not recommended
1028    for ordinary use and its entries are not installed by default.
1029    (Thanks to Lester Caine for the high-quality Jersey, Guernsey, and
1030    Isle of Man entries.)
1031
1032    Some more zones have been turned into links, when they differed
1033    from existing zones only for older time stamps.  As usual,
1034    these changes affect UTC offsets in pre-1970 time stamps only.
1035    Their old contents have been moved to the 'backzone' file.
1036    The affected zones are: Africa/Bangui, Africa/Brazzaville,
1037    Africa/Douala, Africa/Kinshasa, Africa/Libreville, Africa/Luanda,
1038    Africa/Malabo, Africa/Niamey, and Africa/Porto-Novo.
1039
1040  Changes affecting code
1041
1042    Unless NETBSD_INSPIRED is defined to 0, the tz library now
1043    supplies functions for creating and using objects that represent
1044    time zones. The new functions are tzalloc, tzfree, localtime_rz,
1045    mktime_z, and (if STD_INSPIRED is also defined) posix2time_z and
1046    time2posix_z.  They are intended for performance: for example,
1047    localtime_rz (unlike localtime_r) is trivially thread-safe without
1048    locking.  (Thanks to Christos Zoulas for proposing NetBSD-inspired
1049    functions, and to Alan Barrett and Jonathan Lennox for helping to
1050    debug the change.)
1051
1052    zdump now builds with the tz library unless USE_LTZ is defined to 0,
1053    This lets zdump use tz features even if the system library lacks them.
1054    To build zdump with the system library, use 'make CFLAGS=-DUSE_LTZ=0
1055    TZDOBJS=zdump.o CHECK_TIME_T_ALTERNATIVES='.
1056
1057    zdump now uses localtime_rz if available, as it's significantly faster,
1058    and it can help zdump better diagnose invalid time zone names.
1059    Define HAVE_LOCALTIME_RZ to 0 to suppress this.  HAVE_LOCALTIME_RZ
1060    defaults to 1 if NETBSD_INSPIRED && USE_LTZ.  When localtime_rz is
1061    not available, zdump now uses localtime_r and tzset if available,
1062    as this is a bit cleaner and faster than plain localtime.  Compile
1063    with -DHAVE_LOCALTIME_R=0 and/or -DHAVE_TZSET=0 if your system
1064    lacks these two functions.
1065
1066    If THREAD_SAFE is defined to 1, the tz library is now thread-safe.
1067    Although not needed for tz's own applications, which are single-threaded,
1068    this supports POSIX better if the tz library is used in multithreaded apps.
1069
1070    Some crashes have been fixed when zdump or the tz library is given
1071    invalid or outlandish input.
1072
1073    The tz library no longer mishandles leap seconds on platforms with
1074    unsigned time_t in time zones that lack ordinary transitions after 1970.
1075
1076    The tz code now attempts to infer TM_GMTOFF and TM_ZONE if not
1077    already defined, to make it easier to configure on common platforms.
1078    Define NO_TM_GMTOFF and NO_TM_ZONE to suppress this.
1079
1080    Unless the new macro UNINIT_TRAP is defined to 1, the tz code now
1081    assumes that reading uninitialized memory yields garbage values
1082    but does not cause other problems such as traps.
1083
1084    If TM_GMTOFF is defined and UNINIT_TRAP is 0, mktime is now
1085    more likely to guess right for ambiguous time stamps near
1086    transitions where tm_isdst does not change.
1087
1088    If HAVE_STRFTIME_L is defined to 1, the tz library now defines
1089    strftime_l for compatibility with recent versions of POSIX.
1090    Only the C locale is supported, though.  HAVE_STRFTIME_L defaults
1091    to 1 on recent POSIX versions, and to 0 otherwise.
1092
1093    tzselect -c now uses a hybrid distance measure that works better
1094    in Africa.  (Thanks to Alan Barrett for noting the problem.)
1095
1096    The C source code now ports to NetBSD when GCC_DEBUG_FLAGS is used,
1097    or when time_tz is defined.
1098
1099    When HAVE_UTMPX_H is set the 'date' command now builds on systems
1100    whose <utmpx.h> file does not define WTMPX_FILE, and when setting
1101    the date it updates the wtmpx file if _PATH_WTMPX is defined.
1102    This affects GNU/Linux and similar systems.
1103
1104    For easier maintenance later, some C code has been simplified,
1105    some lint has been removed, and the code has been tweaked so that
1106    plain 'make' is more likely to work.
1107
1108    The C type 'bool' is now used for boolean values, instead of 'int'.
1109
1110    The long-obsolete LOCALE_HOME code has been removed.
1111
1112    The long-obsolete 'gtime' function has been removed.
1113
1114  Changes affecting build procedure
1115
1116    'zdump' no longer links in ialloc.o, as it's not needed.
1117
1118    'make check_time_t_alternatives' no longer assumes GNU diff.
1119
1120  Changes affecting distribution tarballs
1121
1122    The files checktab.awk and zoneinfo2tdf.pl are now distributed in
1123    the tzdata tarball instead of the tzcode tarball, since they help
1124    maintain the data.  The NEWS and Theory files are now also
1125    distributed in the tzdata tarball, as they're relevant for data.
1126    (Thanks to Alan Barrett for pointing this out.)  Also, the
1127    leapseconds.awk file is no longer distributed in the tzcode
1128    tarball, since it belongs in the tzdata tarball (where 2014f
1129    inadvertently also distributed it).
1130
1131  Changes affecting documentation and commentary
1132
1133    A new file CONTRIBUTING is distributed.  (Thanks to Tim Parenti for
1134    suggesting a CONTRIBUTING file, and to Tony Finch and Walter Harms
1135    for debugging it.)
1136
1137    The man pages have been updated to use function prototypes,
1138    to document thread-safe variants like localtime_r, and to document
1139    the NetBSD-inspired functions tzalloc, tzfree, localtime_rz, and
1140    mktime_z.
1141
1142    The fields in Link lines have been renamed to be more descriptive
1143    and more like the parameters of 'ln'.  LINK-FROM has become TARGET,
1144    and LINK-TO has become LINK-NAME.
1145
1146    tz-link.htm mentions the IETF's tzdist working group; Windows
1147    Runtime etc. (thanks to Matt Johnson); and HP-UX's tztab.
1148
1149    Some broken URLs have been fixed in the commentary.  (Thanks to
1150    Lester Caine.)
1151
1152    Commentary about Philippines DST has been updated, and commentary
1153    on pre-1970 time in India has been added.
1154
1155
1156Release 2014f - 2014-08-05 17:42:36 -0700
1157
1158  Changes affecting future time stamps
1159
1160    Russia will subtract an hour from most of its time zones on 2014-10-26
1161    at 02:00 local time.  (Thanks to Alexander Krivenyshev.)
1162    There are a few exceptions: Magadan Oblast (Asia/Magadan) and Zabaykalsky
1163    Krai are subtracting two hours; conversely, Chukotka Autonomous Okrug
1164    (Asia/Anadyr), Kamchatka Krai (Asia/Kamchatka), Kemerovo Oblast
1165    (Asia/Novokuznetsk), and the Samara Oblast and the Udmurt Republic
1166    (Europe/Samara) are not changing their clocks.  The changed zones are
1167    Europe/Kaliningrad, Europe/Moscow, Europe/Simferopol, Europe/Volgograd,
1168    Asia/Yekaterinburg, Asia/Omsk, Asia/Novosibirsk, Asia/Krasnoyarsk,
1169    Asia/Irkutsk, Asia/Yakutsk, Asia/Vladivostok, Asia/Khandyga,
1170    Asia/Sakhalin, and Asia/Ust-Nera; Asia/Magadan will have two hours
1171    subtracted; and Asia/Novokuznetsk's time zone abbreviation is affected,
1172    but not its UTC offset.  Two zones are added: Asia/Chita (split
1173    from Asia/Yakutsk, and also with two hours subtracted) and
1174    Asia/Srednekolymsk (split from Asia/Magadan, but with only one hour
1175    subtracted).  (Thanks to Tim Parenti for much of the above.)
1176
1177  Changes affecting time zone abbreviations
1178
1179    Australian eastern time zone abbreviations are now AEST/AEDT not EST,
1180    and similarly for the other Australian zones.  That is, for eastern
1181    standard and daylight saving time the abbreviations are AEST and AEDT
1182    instead of the former EST for both; similarly, ACST/ACDT, ACWST/ACWDT,
1183    and AWST/AWDT are now used instead of the former CST, CWST, and WST.
1184    This change does not affect UTC offsets, only time zone abbreviations.
1185    (Thanks to Rich Tibbett and many others.)
1186
1187    Asia/Novokuznetsk shifts from NOVT to KRAT (remaining on UT +07)
1188    effective 2014-10-26 at 02:00 local time.
1189
1190    The time zone abbreviation for Xinjiang Time (observed in Ürümqi)
1191    has been changed from URUT to XJT.  (Thanks to Luther Ma.)
1192
1193    Prefer MSK/MSD for Moscow time in Russia, even in other cities.
1194    Similarly, prefer EET/EEST for eastern European time in Russia.
1195
1196    Change time zone abbreviations in (western) Samoa to use "ST" and
1197    "DT" suffixes, as this is more likely to match common practice.
1198    Prefix "W" to (western) Samoa time when its standard-time offset
1199    disagrees with that of American Samoa.
1200
1201    America/Metlakatla now uses PST, not MeST, to abbreviate its time zone.
1202
1203    Time zone abbreviations have been updated for Japan's two time
1204    zones used 1896-1937.  JWST now stands for Western Standard
1205    Time, and JCST for Central Standard Time (formerly this was CJT).
1206    These abbreviations are now used for time in Korea, Taiwan,
1207    and Sakhalin while controlled by Japan.
1208
1209  Changes affecting past time stamps
1210
1211    China's five zones have been simplified to two, since the post-1970
1212    differences in the other three seem to have been imaginary.  The
1213    zones Asia/Harbin, Asia/Chongqing, and Asia/Kashgar have been
1214    removed; backwards-compatibility links still work, albeit with
1215    different behaviors for time stamps before May 1980.  Asia/Urumqi's
1216    1980 transition to UT +08 has been removed, so that it is now at
1217    +06 and not +08.  (Thanks to Luther Ma and to Alois Treindl;
1218    Treindl sent helpful translations of two papers by Guo Qingsheng.)
1219
1220    Some zones have been turned into links, when they differed from existing
1221    zones only for older UTC offsets where data entries were likely invented.
1222    These changes affect UTC offsets in pre-1970 time stamps only.  This is
1223    similar to the change in release 2013e, except this time for western
1224    Africa.  The affected zones are: Africa/Bamako, Africa/Banjul,
1225    Africa/Conakry, Africa/Dakar, Africa/Freetown, Africa/Lome,
1226    Africa/Nouakchott, Africa/Ouagadougou, Africa/Sao_Tome, and
1227    Atlantic/St_Helena.  This also affects the backwards-compatibility
1228    link Africa/Timbuktu.  (Thanks to Alan Barrett, Stephen Colebourne,
1229    Tim Parenti, and David Patte for reporting problems in earlier
1230    versions of this change.)
1231
1232    Asia/Shanghai's pre-standard-time UT offset has been changed from
1233    8:05:57 to 8:05:43, the location of Xujiahui Observatory.  Its
1234    transition to standard time has been changed from 1928 to 1901.
1235
1236    Asia/Taipei switched to JWST on 1896-01-01, then to JST on 1937-10-01,
1237    then to CST on 1945-09-21 at 01:00, and did not observe DST in 1945.
1238    In 1946 it observed DST from 05-15 through 09-30; in 1947
1239    from 04-15 through 10-31; and in 1979 from 07-01 through 09-30.
1240    (Thanks to Yu-Cheng Chuang.)
1241
1242    Asia/Riyadh's transition to standard time is now 1947-03-14, not 1950.
1243
1244    Europe/Helsinki's 1942 fall-back transition was 10-04 at 01:00, not
1245    10-03 at 00:00.  (Thanks to Konstantin Hyppönen.)
1246
1247    Pacific/Pago_Pago has been changed from UT -11:30 to -11 for the
1248    period from 1911 to 1950.
1249
1250    Pacific/Chatham has been changed to New Zealand standard time plus
1251    45 minutes for the period before 1957, reflecting a 1956 remark in
1252    the New Zealand parliament.
1253
1254    Europe/Budapest has several pre-1946 corrections: in 1918 the transition
1255    out of DST was on 09-16, not 09-29; in 1919 it was on 11-24, not 09-15; in
1256    1945 it was on 11-01, not 11-03; in 1941 the transition to DST was 04-08
1257    not 04-06 at 02:00; and there was no DST in 1920.
1258
1259    Africa/Accra is now assumed to have observed DST from 1920 through 1935.
1260
1261    Time in Russia before 1927 or so has been corrected by a few seconds in
1262    the following zones: Europe/Moscow, Asia/Irkutsk, Asia/Tbilisi,
1263    Asia/Tashkent, Asia/Vladivostok, Asia/Yekaterinburg, Europe/Helsinki, and
1264    Europe/Riga.  Also, Moscow's location has been changed to its Kilometer 0
1265    point.  (Thanks to Vladimir Karpinsky for the Moscow changes.)
1266
1267  Changes affecting data format
1268
1269    A new file 'zone1970.tab' supersedes 'zone.tab' in the installed data.
1270    The new file's extended format allows multiple country codes per zone.
1271    The older file is still installed but is deprecated; its format is
1272    not changing and it will still be distributed for a while, but new
1273    applications should use the new file.
1274
1275    The new file format simplifies maintenance of obscure locations.
1276    To test this, it adds coverage for the Crozet Islands and the
1277    Scattered Islands.  (Thanks to Tobias Conradi and Antoine Leca.)
1278
1279    The file 'iso3166.tab' is planned to switch from ASCII to UTF-8.
1280    It is still ASCII now, but commentary about the switch has been added.
1281    The new file 'zone1970.tab' already uses UTF-8.
1282
1283  Changes affecting code
1284
1285    'localtime', 'mktime', etc. now use much less stack space if ALL_STATE
1286    is defined.  (Thanks to Elliott Hughes for reporting the problem.)
1287
1288    'zic' no longer mishandles input when ignoring case in locales that
1289    are not compatible with English, e.g., unibyte Turkish locales when
1290    compiled with HAVE_GETTEXT.
1291
1292    Error diagnostics of 'zic' and 'yearistype' have been reworded so that
1293    they no longer use ASCII '-' as if it were a dash.
1294
1295    'zic' now rejects output file names that contain '.' or '..' components.
1296    (Thanks to Tim Parenti for reporting the problem.)
1297
1298    'zic -v' now warns about output file names that do not follow
1299    POSIX rules, or that contain a digit or '.'.  (Thanks to Arthur
1300    David Olson for starting the ball rolling on this.)
1301
1302    Some lint has been removed when using GCC_DEBUG_FLAGS with GCC 4.9.0.
1303
1304  Changes affecting build procedure
1305
1306    'zic' no longer links in localtime.o and asctime.o, as they're not needed.
1307    (Thanks to John Cochran.)
1308
1309  Changes affecting documentation and commentary
1310
1311    The 'Theory' file documents legacy names, the longstanding
1312    exceptions to the POSIX-inspired file name rules.
1313
1314    The 'zic' documentation clarifies the role of time types when
1315    interpreting dates.  (Thanks to Arthur David Olson.)
1316
1317    Documentation and commentary now prefer UTF-8 to US-ASCII,
1318    allowing the use of proper accents in foreign words and names.
1319    Code and data have not changed because of this.  (Thanks to
1320    Garrett Wollman, Ian Abbott, and Guy Harris for helping to debug
1321    this.)
1322
1323    Non-HTML documentation and commentary now use plain-text URLs instead of
1324    HTML insertions, and are more consistent about bracketing URLs when they
1325    are not already surrounded by white space.  (Thanks to suggestions by
1326    Steffen Nurpmeso.)
1327
1328    There is new commentary about Xujiahui Observatory, the five time-zone
1329    project in China from 1918 to 1949, timekeeping in Japanese-occupied
1330    Shanghai, and Tibet Time in the 1950s.  The sharp-eyed can spot the
1331    warlord Jin Shuren in the data.
1332
1333    Commentary about the coverage of each Russian zone has been standardized.
1334    (Thanks to Tim Parenti).
1335
1336    There is new commentary about contemporary timekeeping in Ethiopia.
1337
1338    Obsolete comments about a 2007 proposal for DST in Kuwait has been removed.
1339
1340    There is new commentary about time in Poland in 1919.
1341
1342    Proper credit has been given to DST inventor George Vernon Hudson.
1343
1344    Commentary about time in Metlakatla, AK and Resolute, NU has been
1345    improved, with a new source for the former.
1346
1347    In zone.tab, Pacific/Easter no longer mentions Salas y Gómez, as it
1348    is uninhabited.
1349
1350    Commentary about permanent Antarctic bases has been updated.
1351
1352    Several typos have been corrected.  (Thanks to Tim Parenti for
1353    contributing some of these fixes.)
1354
1355    tz-link.htm now mentions the JavaScript libraries Moment Timezone,
1356    TimezoneJS.Date, Walltime-js, and Timezone.  (Thanks to a heads-up
1357    from Matt Johnson.)  Also, it mentions the Go 'latlong' package.
1358    (Thanks to a heads-up from Dirkjan Ochtman.)
1359
1360    The files usno1988, usno1989, usno1989a, usno1995, usno1997, and usno1998
1361    have been removed.  These obsolescent US Naval Observatory entries were no
1362    longer helpful for maintenance.  (Thanks to Tim Parenti for the suggestion.)
1363
1364
1365Release 2014e - 2014-06-12 21:53:52 -0700
1366
1367  Changes affecting near-future time stamps
1368
1369    Egypt's 2014 Ramadan-based transitions are June 26 and July 31 at 24:00.
1370    (Thanks to Imed Chihi.)  Guess that from 2015 on Egypt will temporarily
1371    switch to standard time at 24:00 the last Thursday before Ramadan, and
1372    back to DST at 00:00 the first Friday after Ramadan.
1373
1374    Similarly, Morocco's are June 28 at 03:00 and August 2 at 02:00.  (Thanks
1375    to Milamber Space Network.)  Guess that from 2015 on Morocco will
1376    temporarily switch to standard time at 03:00 the last Saturday before
1377    Ramadan, and back to DST at 02:00 the first Saturday after Ramadan.
1378
1379  Changes affecting past time stamps
1380
1381    The abbreviation "MSM" (Moscow Midsummer Time) is now used instead of
1382    "MSD" for Moscow's double daylight time in summer 1921.  Also, a typo
1383    "VLASST" has been repaired to be "VLAST" for Vladivostok summer time
1384    in 1991.  (Thanks to Hank W. for reporting the problems.)
1385
1386  Changes affecting commentary
1387
1388    tz-link.htm now cites RFC 7265 for jCal, mentions PTP and the
1389    draft CalDAV extension, updates URLs for TSP, TZInfo, IATA, and
1390    removes stale pointers to World Time Explorer and WORLDTIME.
1391
1392
1393Release 2014d - 2014-05-27 21:34:40 -0700
1394
1395  Changes affecting code
1396
1397    zic no longer generates files containing time stamps before the Big Bang.
1398    This works around GNOME bug 730332
1399    <https://bugzilla.gnome.org/show_bug.cgi?id=730332>.
1400    (Thanks to Leonardo Chiquitto for reporting the bug, and to
1401    Arthur David Olson and James Cloos for suggesting improvements to the fix.)
1402
1403  Changes affecting documentation
1404
1405    tz-link.htm now mentions GNOME.
1406
1407
1408Release 2014c - 2014-05-13 07:44:13 -0700
1409
1410  Changes affecting near-future time stamps
1411
1412    Egypt observes DST starting 2014-05-15 at 24:00.
1413    (Thanks to Ahmad El-Dardiry and Gunther Vermier.)
1414    Details have not been announced, except that DST will not be observed
1415    during Ramadan.  Guess that DST will stop during the same Ramadan dates as
1416    Morocco, and that Egypt's future spring and fall transitions will be the
1417    same as 2010 when it last observed DST, namely April's last Friday at
1418    00:00 to September's last Thursday at 23:00 standard time.  Also, guess
1419    that Ramadan transitions will be at 00:00 standard time.
1420
1421  Changes affecting code
1422
1423    zic now generates transitions for minimum time values, eliminating guesswork
1424    when handling low-valued time stamps.  (Thanks to Arthur David Olson.)
1425
1426    Port to Cygwin sans glibc.  (Thanks to Arthur David Olson.)
1427
1428  Changes affecting commentary and documentation
1429
1430    Remove now-confusing comment about Jordan.  (Thanks to Oleksii Nochovnyi.)
1431
1432
1433Release 2014b - 2014-03-24 21:28:50 -0700
1434
1435  Changes affecting near-future time stamps
1436
1437    Crimea switches to Moscow time on 2014-03-30 at 02:00 local time.
1438    (Thanks to Alexander Krivenyshev.)  Move its zone.tab entry from UA to RU.
1439
1440    New entry for Troll station, Antarctica.  (Thanks to Paul-Inge Flakstad and
1441    Bengt-Inge Larsson.)  This is currently an approximation; a better version
1442    will require the zic and localtime fixes mentioned below, and the plan is
1443    to wait for a while until at least the zic fixes propagate.
1444
1445  Changes affecting code
1446
1447    'zic' and 'localtime' no longer reject locations needing four transitions
1448    per year for the foreseeable future.  (Thanks to Andrew Main (Zefram).)
1449    Also, 'zic' avoids some unlikely failures due to integer overflow.
1450
1451  Changes affecting build procedure
1452
1453    'make check' now detects Rule lines defined but never used.
1454    The NZAQ rules, an instance of this problem, have been removed.
1455
1456  Changes affecting commentary and documentation
1457
1458    Fix Tuesday/Thursday typo in description of time in Israel.
1459    (Thanks to Bert Katz via Pavel Kharitonov and Mike Frysinger.)
1460
1461    Microsoft Windows 8.1 doesn't support tz database names.  (Thanks
1462    to Donald MacQueen.)  Instead, the Microsoft Windows Store app
1463    library supports them.
1464
1465    Add comments about Johnston Island time in the 1960s.
1466    (Thanks to Lyle McElhaney.)
1467
1468    Morocco's 2014 DST start will be as predicted.
1469    (Thanks to Sebastien Willemijns.)
1470
1471
1472Release 2014a - 2014-03-07 23:30:29 -0800
1473
1474  Changes affecting near-future time stamps
1475
1476    Turkey begins DST on 2014-03-31, not 03-30.  (Thanks to Faruk Pasin for
1477    the heads-up, and to Tim Parenti for simplifying the update.)
1478
1479  Changes affecting past time stamps
1480
1481    Fiji ended DST on 2014-01-19 at 02:00, not the previously-scheduled 03:00.
1482    (Thanks to Steffen Thorsen.)
1483
1484    Ukraine switched from Moscow to Eastern European time on 1990-07-01
1485    (not 1992-01-01), and observed DST during the entire next winter.
1486    (Thanks to Vladimir in Moscow via Alois Treindl.)
1487
1488    In 1988 Israel observed DST from 04-10 to 09-04, not 04-09 to 09-03.
1489    (Thanks to Avigdor Finkelstein.)
1490
1491  Changes affecting code
1492
1493    A uninitialized-storage bug in 'localtime' has been fixed.
1494    (Thanks to Logan Chien.)
1495
1496  Changes affecting the build procedure
1497
1498    The settings for 'make check_web' now default to Ubuntu 13.10.
1499
1500  Changes affecting commentary and documentation
1501
1502    The boundary of the US Pacific time zone is given more accurately.
1503    (Thanks to Alan Mintz.)
1504
1505    Chile's 2014 DST will be as predicted.  (Thanks to José Miguel Garrido.)
1506
1507    Paraguay's 2014 DST will be as predicted.  (Thanks to Carlos Raúl Perasso.)
1508
1509    Better descriptions of countries with same time zone history as
1510    Trinidad and Tobago since 1970.  (Thanks to Alan Barrett for suggestion.)
1511
1512    Several changes affect tz-link.htm, the main web page.
1513
1514      Mention Time.is (thanks to Even Scharning) and WX-now (thanks to
1515      David Braverman).
1516
1517      Mention xCal (Internet RFC 6321) and jCal.
1518
1519      Microsoft has some support for tz database names.
1520
1521      CLDR data formats include both XML and JSON.
1522
1523      Mention Maggiolo's map of solar vs standard time.
1524      (Thanks to Arthur David Olson.)
1525
1526      Mention TZ4Net.  (Thanks to Matt Johnson.)
1527
1528      Mention the timezone-olson Haskell package.
1529
1530      Mention zeitverschiebung.net.  (Thanks to Martin Jäger.)
1531
1532      Remove moribund links to daylight-savings-time.info and to
1533      Simple Timer + Clocks.
1534
1535      Update two links.  (Thanks to Oscar van Vlijmen.)
1536
1537      Fix some formatting glitches, e.g., remove random newlines from
1538      abbr elements' title attributes.
1539
1540
1541Release 2013i - 2013-12-17 07:25:23 -0800
1542
1543  Changes affecting near-future time stamps:
1544
1545    Jordan switches back to standard time at 00:00 on December 20, 2013.
1546    The 2006-2011 transition schedule is planned to resume in 2014.
1547    (Thanks to Steffen Thorsen.)
1548
1549  Changes affecting past time stamps:
1550
1551    In 2004, Cuba began DST on March 28, not April 4.
1552    (Thanks to Steffen Thorsen.)
1553
1554  Changes affecting code
1555
1556    The compile-time flag NOSOLAR has been removed, as nowadays the
1557    benefit of slightly shrinking runtime table size is outweighed by the
1558    cost of disallowing potential future updates that exceed old limits.
1559
1560  Changes affecting documentation and commentary
1561
1562    The files solar87, solar88, and solar89 are no longer distributed.
1563    They were a negative experiment - that is, a demonstration that
1564    tz data can represent solar time only with some difficulty and error.
1565    Their presence in the distribution caused confusion, as Riyadh
1566    civil time was generally not solar time in those years.
1567
1568    tz-link.htm now mentions Noda Time.  (Thanks to Matt Johnson.)
1569
1570
1571Release 2013h - 2013-10-25 15:32:32 -0700
1572
1573  Changes affecting current and future time stamps:
1574
1575    Libya has switched its UT offset back to +02 without DST, instead
1576    of +01 with DST.  (Thanks to Even Scharning.)
1577
1578    Western Sahara (Africa/El_Aaiun) uses Morocco's DST rules.
1579    (Thanks to Gwillim Law.)
1580
1581  Changes affecting future time stamps:
1582
1583    Acre and (we guess) western Amazonas will switch from UT -04 to -05
1584    on 2013-11-10.  This affects America/Rio_Branco and America/Eirunepe.
1585    (Thanks to Steffen Thorsen.)
1586
1587    Add entries for DST transitions in Morocco in the year 2038.
1588    This avoids some year-2038 glitches introduced in 2013g.
1589    (Thanks to Yoshito Umaoka for reporting the problem.)
1590
1591  Changes affecting API
1592
1593    The 'tzselect' command no longer requires the 'select' command,
1594    and should now work with /bin/sh on more platforms.  It also works
1595    around a bug in BusyBox awk before version 1.21.0.  (Thanks to
1596    Patrick 'P. J.' McDermott and Alan Barrett.)
1597
1598  Changes affecting code
1599
1600    Fix localtime overflow bugs with 32-bit unsigned time_t.
1601
1602    zdump no longer assumes sscanf returns maximal values on overflow.
1603
1604  Changes affecting the build procedure
1605
1606    The builder can specify which programs to use, if any, instead of
1607    'ar' and 'ranlib', and libtz.a is now built locally before being
1608    installed.  (Thanks to Michael Forney.)
1609
1610    A dependency typo in the 'zdump' rule has been fixed.
1611    (Thanks to Andrew Paprocki.)
1612
1613    The Makefile has been simplified by assuming that 'mkdir -p' and 'cp -f'
1614    work as specified by POSIX.2-1992 or later; this is portable nowadays.
1615
1616    'make clean' no longer removes 'leapseconds', since it's
1617    host-independent and is part of the distribution.
1618
1619    The unused makefile macros TZCSRCS, TZDSRCS, DATESRCS have been removed.
1620
1621  Changes affecting documentation and commentary
1622
1623    tz-link.htm now mentions TC TIMEZONE's draft time zone service protocol
1624    (thanks to Mike Douglass) and TimezoneJS.Date (thanks to Jim Fehrle).
1625
1626    Update URLs in tz-link page.  Add URLs for Microsoft Windows, since
1627    8.1 introduces tz support.  Remove URLs for Tru64 and UnixWare (no
1628    longer maintained) and for old advisories.  SOFA now does C.
1629
1630Release 2013g - 2013-09-30 21:08:26 -0700
1631
1632  Changes affecting current and near-future time stamps
1633
1634    Morocco now observes DST from the last Sunday in March to the last
1635    Sunday in October, not April to September respectively.  (Thanks
1636    to Steffen Thorsen.)
1637
1638  Changes affecting 'zic'
1639
1640    'zic' now runs on platforms that lack both hard links and symlinks.
1641    (Thanks to Theo Veenker for reporting the problem, for MinGW.)
1642    Also, fix some bugs on platforms that lack hard links but have symlinks.
1643
1644    'zic -v' again warns that Asia/Tehran has no POSIX environment variable
1645    to predict the far future, fixing a bug introduced in 2013e.
1646
1647  Changes affecting the build procedure
1648
1649    The 'leapseconds' file is again put into the tzdata tarball.
1650    Also, 'leapseconds.awk', so tzdata is self-contained.  (Thanks to
1651    Matt Burgess and Ian Abbott.)  The timestamps of these and other
1652    dependent files in tarballs are adjusted more consistently.
1653
1654  Changes affecting documentation and commentary
1655
1656    The README file is now part of the data tarball as well as the code.
1657    It now states that files are public domain unless otherwise specified.
1658    (Thanks to Andrew Main (Zefram) for asking for clarifications.)
1659    Its details about the 1989 release moved to a place of honor near
1660    the end of NEWS.
1661
1662
1663Release 2013f - 2013-09-24 23:37:36 -0700
1664
1665  Changes affecting near-future time stamps
1666
1667    Tocantins will very likely not observe DST starting this spring.
1668    (Thanks to Steffen Thorsen.)
1669
1670    Jordan will likely stay at UT +03 indefinitely, and will not fall
1671    back this fall.
1672
1673    Palestine will fall back at 00:00, not 01:00.  (Thanks to Steffen Thorsen.)
1674
1675  Changes affecting API
1676
1677    The types of the global variables 'timezone' and 'altzone' (if present)
1678    have been changed back to 'long'.  This is required for 'timezone'
1679    by POSIX, and for 'altzone' by common practice, e.g., Solaris 11.
1680    These variables were originally 'long' in the tz code, but were
1681    mistakenly changed to 'time_t' in 1987; nobody reported the
1682    incompatibility until now.  The difference matters on x32, where
1683    'long' is 32 bits and 'time_t' is 64.  (Thanks to Elliott Hughes.)
1684
1685  Changes affecting the build procedure
1686
1687    Avoid long strings in leapseconds.awk to work around a mawk bug.
1688    (Thanks to Cyril Baurand.)
1689
1690  Changes affecting documentation and commentary
1691
1692    New file 'NEWS' that contains release notes like this one.
1693
1694    Paraguay's law does not specify DST transition time; 00:00 is customary.
1695    (Thanks to Waldemar Villamayor-Venialbo.)
1696
1697    Minor capitalization fixes.
1698
1699  Changes affecting version-control only
1700
1701    The experimental GitHub repository now contains annotated and
1702    signed tags for recent releases, e.g., '2013e' for Release 2013e.
1703    Releases are tagged starting with 2012e; earlier releases were
1704    done differently, and tags would either not have a simple name or
1705    not exactly match what was released.
1706
1707    'make set-timestamps' is now simpler and a bit more portable.
1708
1709
1710Release 2013e - 2013-09-19 23:50:04 -0700
1711
1712  Changes affecting near-future time stamps
1713
1714    This year Fiji will start DST on October 27, not October 20.
1715    (Thanks to David Wheeler for the heads-up.)  For now, guess that
1716    Fiji will continue to spring forward the Sunday before the fourth
1717    Monday in October.
1718
1719  Changes affecting current and future time zone abbreviations
1720
1721    Use WIB/WITA/WIT rather than WIT/CIT/EIT for alphabetic Indonesian
1722    time zone abbreviations since 1932.  (Thanks to George Ziegler,
1723    Priyadi Iman Nurcahyo, Zakaria, Jason Grimes, Martin Pitt, and
1724    Benny Lin.)  This affects Asia/Dili, Asia/Jakarta, Asia/Jayapura,
1725    Asia/Makassar, and Asia/Pontianak.
1726
1727    Use ART (UT -03, standard time), rather than WARST (also -03, but
1728    daylight saving time) for San Luis, Argentina since 2009.
1729
1730  Changes affecting Godthåb time stamps after 2037 if version mismatch
1731
1732    Allow POSIX-like TZ strings where the transition time's hour can
1733    range from -167 through 167, instead of the POSIX-required 0
1734    through 24.  E.g., TZ='FJT-12FJST,M10.3.1/146,M1.3.4/75' for the
1735    new Fiji rules.  This is a more-compact way to represent
1736    far-future time stamps for America/Godthab, America/Santiago,
1737    Antarctica/Palmer, Asia/Gaza, Asia/Hebron, Asia/Jerusalem,
1738    Pacific/Easter, and Pacific/Fiji.  Other zones are unaffected by
1739    this change.  (Derived from a suggestion by Arthur David Olson.)
1740
1741    Allow POSIX-like TZ strings where daylight saving time is in
1742    effect all year.  E.g., TZ='WART4WARST,J1/0,J365/25' for Western
1743    Argentina Summer Time all year.  This supports a more-compact way
1744    to represent the 2013d data for America/Argentina/San_Luis.
1745    Because of the change for San Luis noted above this change does not
1746    affect the current data.  (Thanks to Andrew Main (Zefram) for
1747    suggestions that improved this change.)
1748
1749    Where these two TZ changes take effect, there is a minor extension
1750    to the tz file format in that it allows new values for the
1751    embedded TZ-format string, and the tz file format version number
1752    has therefore been increased from 2 to 3 as a precaution.
1753    Version-2-based client code should continue to work as before for
1754    all time stamps before 2038.  Existing version-2-based client code
1755    (tzcode, GNU/Linux, Solaris) has been tested on version-3-format
1756    files, and typically works in practice even for time stamps after
1757    2037; the only known exception is America/Godthab.
1758
1759  Changes affecting time stamps before 1970
1760
1761    Pacific/Johnston is now a link to Pacific/Honolulu.  This corrects
1762    some errors before 1947.
1763
1764    Some zones have been turned into links, when they differ from existing
1765    zones only in older data entries that were likely invented or that
1766    differ only in LMT or transitions from LMT.  These changes affect
1767    only time stamps before 1943.  The affected zones are:
1768    Africa/Juba, America/Anguilla, America/Aruba, America/Dominica,
1769    America/Grenada, America/Guadeloupe, America/Marigot,
1770    America/Montserrat, America/St_Barthelemy, America/St_Kitts,
1771    America/St_Lucia, America/St_Thomas, America/St_Vincent,
1772    America/Tortola, and Europe/Vaduz.  (Thanks to Alois Treindl for
1773    confirming that the old Europe/Vaduz zone was wrong and the new
1774    link is better for WWII-era times.)
1775
1776    Change Kingston Mean Time from -5:07:12 to -5:07:11.  This affects
1777    America/Cayman, America/Jamaica and America/Grand_Turk time stamps
1778    from 1890 to 1912.
1779
1780    Change the UT offset of Bern Mean Time from 0:29:44 to 0:29:46.
1781    This affects Europe/Zurich time stamps from 1853 to 1894.  (Thanks
1782    to Alois Treindl).
1783
1784    Change the date of the circa-1850 Zurich transition from 1849-09-12
1785    to 1853-07-16, overriding Shanks with data from Messerli about
1786    postal and telegraph time in Switzerland.
1787
1788  Changes affecting time zone abbreviations before 1970
1789
1790    For Asia/Jakarta, use BMT (not JMT) for mean time from 1923 to 1932,
1791    as Jakarta was called Batavia back then.
1792
1793  Changes affecting API
1794
1795    The 'zic' command now outputs a dummy transition when far-future
1796    data can't be summarized using a TZ string, and uses a 402-year
1797    window rather than a 400-year window.  For the current data, this
1798    affects only the Asia/Tehran file.  It does not affect any of the
1799    time stamps that this file represents, so zdump outputs the same
1800    information as before.  (Thanks to Andrew Main (Zefram).)
1801
1802    The 'date' command has a new '-r' option, which lets you specify
1803    the integer time to display, a la FreeBSD.
1804
1805    The 'tzselect' command has two new options '-c' and '-n', which lets you
1806    select a zone based on latitude and longitude.
1807
1808    The 'zic' command's '-v' option now warns about constructs that
1809    require the new version-3 binary file format.  (Thanks to Arthur
1810    David Olson for the suggestion.)
1811
1812    Support for floating-point time_t has been removed.
1813    It was always dicey, and POSIX no longer requires it.
1814    (Thanks to Eric Blake for suggesting to the POSIX committee to
1815    remove it, and thanks to Alan Barrett, Clive D.W. Feather, Andy
1816    Heninger, Arthur David Olson, and Alois Treindl, for reporting
1817    bugs and elucidating some of the corners of the old floating-point
1818    implementation.)
1819
1820    The signatures of 'offtime', 'timeoff', and 'gtime' have been
1821    changed back to the old practice of using 'long' to represent UT
1822    offsets.  This had been inadvertently and mistakenly changed to
1823    'int_fast32_t'.  (Thanks to Christos Zoulas.)
1824
1825    The code avoids undefined behavior on integer overflow in some
1826    more places, including gmtime, localtime, mktime and zdump.
1827
1828  Changes affecting the zdump utility
1829
1830    zdump now outputs "UT" when referring to Universal Time, not "UTC".
1831    "UTC" does not make sense for time stamps that predate the introduction
1832    of UTC, whereas "UT", a more-generic term, does.  (Thanks to Steve Allen
1833    for clarifying UT vs UTC.)
1834
1835  Data changes affecting behavior of tzselect and similar programs
1836
1837    Country code BQ is now called the more-common name "Caribbean Netherlands"
1838    rather than the more-official "Bonaire, St Eustatius & Saba".
1839
1840    Remove from zone.tab the names America/Montreal, America/Shiprock,
1841    and Antarctica/South_Pole, as they are equivalent to existing
1842    same-country-code zones for post-1970 time stamps.  The data entries for
1843    these names are unchanged, so the names continue to work as before.
1844
1845  Changes affecting code internals
1846
1847    zic -c now runs way faster on 64-bit hosts when given large numbers.
1848
1849    zic now uses vfprintf to avoid allocating and freeing some memory.
1850
1851    tzselect now computes the list of continents from the data,
1852    rather than have it hard-coded.
1853
1854    Minor changes pacify GCC 4.7.3 and GCC 4.8.1.
1855
1856  Changes affecting the build procedure
1857
1858    The 'leapseconds' file is now generated automatically from a
1859    new file 'leap-seconds.list', which is a copy of
1860    <ftp://time.nist.gov/pub/leap-seconds.list>.
1861    A new source file 'leapseconds.awk' implements this.
1862    The goal is simplification of the future maintenance of 'leapseconds'.
1863
1864    When building the 'posix' or 'right' subdirectories, if the
1865    subdirectory would be a copy of the default subdirectory, it is
1866    now made a symbolic link if that is supported.  This saves about
1867    2 MB of file system space.
1868
1869    The links America/Shiprock and Antarctica/South_Pole have been
1870    moved to the 'backward' file.  This affects only nondefault builds
1871    that omit 'backward'.
1872
1873  Changes affecting version-control only
1874
1875    .gitignore now ignores 'date'.
1876
1877  Changes affecting documentation and commentary
1878
1879    Changes to the 'tzfile' man page
1880
1881      It now mentions that the binary file format may be extended in
1882      future versions by appending data.
1883
1884      It now refers to the 'zdump' and 'zic' man pages.
1885
1886    Changes to the 'zic' man page
1887
1888      It lists conditions that elicit a warning with '-v'.
1889
1890      It says that the behavior is unspecified when duplicate names
1891      are given, or if the source of one link is the target of another.
1892
1893      Its examples are updated to match the latest data.
1894
1895      The definition of white space has been clarified slightly.
1896      (Thanks to Michael Deckers.)
1897
1898    Changes to the 'Theory' file
1899
1900      There is a new section about the accuracy of the tz database,
1901      describing the many ways that errors can creep in, and
1902      explaining why so many of the pre-1970 time stamps are wrong or
1903      misleading (thanks to Steve Allen, Lester Caine, and Garrett
1904      Wollman for discussions that contributed to this).
1905
1906      The 'Theory' file describes LMT better (this follows a
1907      suggestion by Guy Harris).
1908
1909      It refers to the 2013 edition of POSIX rather than the 2004 edition.
1910
1911      It's mentioned that excluding 'backward' should not affect the
1912      other data, and it suggests at least one zone.tab name per
1913      inhabited country (thanks to Stephen Colebourne).
1914
1915      Some longstanding restrictions on names are documented, e.g.,
1916      'America/New_York' precludes 'America/New_York/Bronx'.
1917
1918      It gives more reasons for the 1970 cutoff.
1919
1920      It now mentions which time_t variants are supported, such as
1921      signed integer time_t.  (Thanks to Paul Goyette for reporting
1922      typos in an experimental version of this change.)
1923
1924      (Thanks to Philip Newton for correcting typos in these changes.)
1925
1926    Documentation and commentary is more careful to distinguish UT in
1927    general from UTC in particular.  (Thanks to Steve Allen.)
1928
1929    Add a better source for the Zurich 1894 transition.
1930    (Thanks to Pierre-Yves Berger.)
1931
1932    Update shapefile citations in tz-link.htm.  (Thanks to Guy Harris.)
1933
1934
1935Release 2013d - 2013-07-05 07:38:01 -0700
1936
1937  Changes affecting future time stamps:
1938
1939    Morocco's midsummer transitions this year are July 7 and August 10,
1940    not July 9 and August 8.  (Thanks to Andrew Paprocki.)
1941
1942    Israel now falls back on the last Sunday of October.
1943    (Thanks to Ephraim Silverberg.)
1944
1945  Changes affecting past time stamps:
1946
1947    Specify Jerusalem's location more precisely; this changes the pre-1880
1948    times by 2 s.
1949
1950  Changing affecting metadata only:
1951
1952    Fix typos in the entries for country codes BQ and SX.
1953
1954  Changes affecting code:
1955
1956    Rework the code to fix a bug with handling Australia/Macquarie on
1957    32-bit hosts (thanks to Arthur David Olson).
1958
1959    Port to platforms like NetBSD, where time_t can be wider than long.
1960
1961    Add support for testing time_t types other than the system's.
1962    Run 'make check_time_t_alternatives' to try this out.
1963    Currently, the tests fail for unsigned time_t;
1964    this should get fixed at some point.
1965
1966  Changes affecting documentation and commentary:
1967
1968    Deemphasize the significance of national borders.
1969
1970    Update the zdump man page.
1971
1972    Remove obsolete NOID comment (thanks to Denis Excoffier).
1973
1974    Update several URLs and comments in the web pages.
1975
1976    Spelling fixes (thanks to Kevin Lyda and Jonathan Leffler).
1977
1978    Update URL for CLDR Zone->Tzid table (thanks to Yoshito Umaoka).
1979
1980
1981Release 2013c - 2013-04-19 16:17:40 -0700
1982
1983  Changes affecting current and future time stamps:
1984
1985    Palestine observed DST starting March 29, 2013.  (Thanks to
1986    Steffen Thorsen.)  From 2013 on, Gaza and Hebron both observe DST,
1987    with the predicted rules being the last Thursday in March at 24:00
1988    to the first Friday on or after September 21 at 01:00.
1989
1990    Assume that the recent change to Paraguay's DST rules is permanent,
1991    by moving the end of DST to the 4th Sunday in March every year.
1992    (Thanks to Carlos Raúl Perasso.)
1993
1994  Changes affecting past time stamps:
1995
1996    Fix some historical data for Palestine to agree with that of
1997    timeanddate.com, as follows:
1998
1999	  The spring 2008 change in Gaza and Hebron was on 00:00 Mar 28, not
2000	  00:00 Apr 1.
2001
2002	  The fall 2009 change in Gaza and Hebron on Sep 4 was at 01:00, not
2003	  02:00.
2004
2005	  The spring 2010 change in Hebron was 00:00 Mar 26, not 00:01 Mar 27.
2006
2007	  The spring 2011 change in Gaza was 00:01 Apr 1, not 12:01 Apr 2.
2008
2009	  The spring 2011 change in Hebron on Apr 1 was at 00:01, not 12:01.
2010
2011	  The fall 2011 change in Hebron on Sep 30 was at 00:00, not 03:00.
2012
2013    Fix times of habitation for Macquarie to agree with the Tasmania
2014    Parks & Wildlife Service history, which indicates that permanent
2015    habitation was 1899-1919 and 1948 on.
2016
2017  Changing affecting metadata only:
2018
2019    Macquarie Island is politically part of Australia, not Antarctica.
2020    (Thanks to Tobias Conradi.)
2021
2022    Sort Macquarie more-consistently with other parts of Australia.
2023    (Thanks to Tim Parenti.)
2024
2025
2026Release 2013b - 2013-03-10 22:33:40 -0700
2027
2028  Changes affecting current and future time stamps:
2029
2030    Haiti uses US daylight-saving rules this year, and presumably future years.
2031    This changes time stamps starting today.  (Thanks to Steffen Thorsen.)
2032
2033    Paraguay will end DST on March 24 this year.
2034    (Thanks to Steffen Thorsen.)  For now, assume it's just this year.
2035
2036    Morocco does not observe DST during Ramadan;
2037    try to predict Ramadan in Morocco as best we can.
2038    (Thanks to Erik Homoet for the heads-up.)
2039
2040  Changes affecting commentary:
2041
2042    Update URLs in tz-link page.  Add URLs for webOS, BB10, iOS.
2043    Update URL for Solaris.  Mention Internet RFC 6557.
2044    Update Internet RFCs 2445->5545, 2822->5322.
2045    Switch from FTP to HTTP for Internet RFCs.
2046
2047
2048Release 2013a - 2013-02-27 09:20:35 -0800
2049
2050  Change affecting binary data format:
2051
2052    The zone offset at the end of version-2-format zone files is now
2053    allowed to be 24:00, as per POSIX.1-2008.  (Thanks to Arthur David Olson.)
2054
2055  Changes affecting current and future time stamps:
2056
2057    Chile's 2013 rules, and we guess rules for 2014 and later, will be
2058    the same as 2012, namely Apr Sun>=23 03:00 UTC to Sep Sun>=2 04:00 UTC.
2059    (Thanks to Steffen Thorsen and Robert Elz.)
2060
2061    New Zones Asia/Khandyga, Asia/Ust-Nera, Europe/Busingen.
2062    (Thanks to Tobias Conradi and Arthur David Olson.)
2063
2064  Many changes affect historical time stamps before 1940.
2065  These were deduced from: Milne J. Civil time. Geogr J. 1899
2066  Feb;13(2):173-94 <http://www.jstor.org/stable/1774359>.
2067
2068  Changes affecting the code:
2069
2070    Fix zic bug that mishandled Egypt's 2010 changes (this also affected
2071    the data).  (Thanks to Arthur David Olson.)
2072
2073    Fix localtime bug when time_t is unsigned and data files were generated
2074    by a signed time_t system.  (Thanks to Doug Bailey for reporting and
2075    to Arthur David Olson for fixing.)
2076
2077    Allow the email address for bug reports to be set by the packager.
2078    The default is tz@iana.org, as before.  (Thanks to Joseph S. Myers.)
2079
2080    Update HTML checking to be compatible with Ubuntu 12.10.
2081
2082    Check that files are a safe subset of ASCII.  At some point we may
2083    relax this requirement to a safe subset of UTF-8.  Without the
2084    check, some non-UTF-8 encodings were leaking into the distribution.
2085
2086  Commentary changes:
2087
2088    Restore a comment about copyright notices that was inadvertently deleted.
2089    (Thanks to Arthur David Olson.)
2090
2091    Improve the commentary about which districts observe what times
2092    in Russia.  (Thanks to Oscar van Vlijmen and Arthur David Olson).
2093
2094    Add web page links to tz.js.
2095
2096    Add "Run by the Monkeys" to tz-art.  (Thanks to Arthur David Olson.)
2097
2098
2099Release 2012j - 2012-11-12 18:34:49 -0800
2100
2101  Libya moved to CET this weekend, but with DST planned next year.
2102  (Thanks to Even Scharning, Steffen Thorsen, and Tim Parenti.)
2103
2104  Signatures now have the extension .asc, not .sign, as that's more
2105  standard.  (Thanks to Phil Pennock.)
2106
2107  The output of 'zdump --version', and of 'zic --version', now
2108  uses a format that is more typical for --version.
2109  (Thanks to Joseph S. Myers.)
2110
2111  The output of 'tzselect --help', 'zdump --help', and 'zic --help'
2112  now uses tz@iana.org rather than the old elsie address.
2113
2114  zic -v now complains about abbreviations that are less than 3
2115  or more than 6 characters, as per Posix.  Formerly, it checked
2116  for abbreviations that were more than 3.
2117
2118  'make public' no longer puts its temporary directory under /tmp,
2119  and uses the just-built zic rather than the system zic.
2120
2121  Various fixes to documentation and commentary.
2122
2123
2124Release 2012i - 2012-11-03 12:57:09 -0700
2125
2126  Cuba switches from DST tomorrow at 01:00.  (Thanks to Steffen Thorsen.)
2127
2128  Linker flags can now be specified via LDFLAGS.
2129  AWK now defaults to 'awk', not 'nawk'.
2130  The shell in tzselect now defaults to /bin/bash, but this can
2131  be overridden by specifying KSHELL.
2132  The main web page now mentions the unofficial GitHub repository.
2133  (Thanks to Mike Frysinger.)
2134
2135  Tarball signatures can now be built by running 'make signatures'.
2136  There are also new makefile rules 'tarballs', 'check_public', and
2137  separate makefile rules for each tarball and signature file.
2138  A few makefile rules are now more portable to strict POSIX.
2139
2140  The main web page now lists the canonical IANA URL.
2141
2142
2143Release 2012h - 2012-10-26 22:49:10 -0700
2144
2145  Bahia no longer has DST.  (Thanks to Kelley Cook.)
2146
2147  Tocantins has DST.  (Thanks to Rodrigo Severo.)
2148
2149  Israel has new DST rules next year.  (Thanks to Ephraim Silverberg.)
2150
2151  Jordan stays on DST this winter.  (Thanks to Steffen Thorsen.)
2152
2153  Web page updates.
2154
2155  More C modernization, except that at Arthur David Olson's suggestion
2156  the instances of 'register' were kept.
2157
2158
2159Release 2012g - 2012-10-17 20:59:45 -0700
2160
2161  Samoa fall 2012 and later.  (Thanks to Nicholas Pereira and Robert Elz.)
2162
2163  Palestine fall 2012.  (Thanks to Steffen Thorsen.)
2164
2165  Assume C89.
2166
2167  To attack the version-number problem, this release ships the file
2168  'Makefile' (which contains the release number) in both the tzcode and
2169  the tzdata tarballs.  The two Makefiles are identical, and should be
2170  identical in any matching pair of tarballs, so it shouldn't matter
2171  which order you extract the tarballs.  Perhaps we can come up with a
2172  better version-number scheme at some point; this scheme does have the
2173  virtue of not adding more files.
2174
2175
2176Release 2012f - 2012-09-12 23:17:03 -0700
2177
2178  * australasia (Pacific/Fiji): Fiji DST is October 21 through January
2179    20 this year.  (Thanks to Steffen Thorsen.)
2180
2181
2182Release 2012e - 2012-08-02 20:44:55 -0700
2183
2184  * australasia (Pacific/Fakaofo): Tokelau is UT +13, not +14.
2185    (Thanks to Steffen Thorsen.)
2186
2187  * Use a single version number for both code and data.
2188
2189  * .gitignore: New file.
2190
2191  * Remove trailing white space.
2192
2193
2194Release code2012c-data2012d - 2012-07-19 16:35:33 -0700
2195
2196  Changes for Morocco's time stamps, which take effect in a couple of
2197  hours, along with infrastructure changes to accommodate how the tz
2198  code and data are released on IANA.
2199
2200
2201Release data2012c - 2012-03-27 12:17:25 -0400
2202
2203  africa
2204	Summer time changes for Morocco (to start late April 2012)
2205
2206  asia
2207	Changes for 2012 for Gaza & the West Bank (Hebron) and Syria
2208
2209  northamerica
2210	Haiti following US/Canada rules for 2012 (and we're assuming,
2211	for now anyway, for the future).
2212
2213
2214Release 2012b - 2012-03-02 12:29:15 +0700
2215
2216  There is just one change to tzcode2012b (compared with 2012a):
2217  the Makefile that was accidentally included with 2012a has been
2218  replaced with the version that should have been there, which is
2219  identical with the previous version (from tzcode2011i).
2220
2221  There are just two changes in tzdata2012b compared with 2012a.
2222
2223  Most significantly, summer time in Cuba has been delayed 3 weeks
2224  (now starts April 1 rather than March 11).   Since Mar 11 (the old start
2225  date, as listed in 2012a) is just a little over a week away, this
2226  change is urgent.
2227
2228  Less importantly, an excess tab in one of the changes in zone.tab
2229  in 2012a has been removed.
2230
2231
2232Release 2012a - 2012-03-01 18:28:10 +0700
2233
2234  The changes in tzcode2012a (compared to the previous version, 2011i)
2235  are entirely to the README and tz-art.htm and tz-link.htm files, if
2236  none of those concern you, you can ignore the code update.  The changes
2237  reflect the changed addresses for the mailing list and the code and
2238  data distribution points & methods (and a link to DateTime::TimeZone::Tzfile
2239  has been added to tz-link.htm).
2240
2241  In tzdata2012a (compared to the previous release, which was 2011n)
2242  the major changes are:
2243	Chile 2011/2012 and 2012/2013 summer time date adjustments.
2244	Falkland Islands onto permanent summer time (we're assuming for the
2245		foreseeable future, though 2012 is all we're fairly certain of.)
2246	Armenia has abolished Summer Time.
2247	Tokelau jumped the International Date Line back last December
2248		(just the same as their near neighbour, Samoa).
2249	America/Creston is a new zone for a small area of British Columbia
2250	There will be a leapsecond 2012-06-30 23:59:60 UTC.
2251
2252  Other minor changes are:
2253	Corrections to 1918 Canadian summer time end dates.
2254	Updated URL for UK time zone history (in comments)
2255	A few typos in Le Corre's list of free French place names (comments)
2256
2257
2258Release data2011n - 2011-10-30 14:57:54 +0700
2259
2260  There are three changes of note - most urgently, Cuba (America/Havana)
2261  has extended summer time by two weeks, now to end on Nov 13, rather than
2262  the (already past) Oct 30.   Second, the Pridnestrovian Moldavian Republic
2263  (Europe/Tiraspol) decided not to split from the rest of Moldova after
2264  all, and consequently that zone has been removed (again) and reinstated
2265  in the "backward" file as a link to Europe/Chisinau.   And third, the
2266  end date for Fiji's summer time this summer was moved forward from the
2267  earlier planned Feb 26, to Jan 22.
2268
2269  Apart from that, Moldova (MD) returns to a single entry in zone.tab
2270  (and the incorrect syntax that was in the 2011m version of that file
2271  is so fixed - it would have been fixed in a different way had this
2272  change not happened - that's the "missing" sccs version id).
2273
2274
2275Release data2011m - 2011-10-24 21:42:16 +0700
2276
2277  In particular, the typos in comments in the data (2011-11-17 should have
2278  been 2011-10-17 as Alan Barrett noted, and spelling of Tiraspol that
2279  Tim Parenti noted) have been fixed, and the change for Ukraine has been
2280  made in all 4 Ukrainian zones, rather than just Kiev (again, thanks to
2281  Tim Parenti, and also Denys Gavrysh)
2282
2283  In addition, I added Europe/Tiraspol to zone.tab.
2284
2285  This time, all the files have new version numbers...  (including the files
2286  otherwise unchanged in 2011m that were changed in 2011l but didn't get new
2287  version numbers there...)
2288
2289
2290Release data2011l - 2011-10-10 11:15:43 +0700
2291
2292  There are just 2 changes that cause different generated tzdata files from
2293  zic, to Asia/Hebron and Pacific/Fiji - the possible change for Bahia, Brazil
2294  is included, but commented out.  Compared with the diff I sent out last week,
2295  this version also includes attributions for the sources for the changes
2296  (in much the same format as ado used, but the html tags have not been
2297  checked, verified, or used in any way at all, so if there are errors there,
2298  please let me know.)
2299
2300
2301Release data2011k - 2011-09-20 17:54:03 -0400
2302
2303  [not summarized]
2304
2305
2306Release data2011j - 2011-09-12 09:22:49 -0400
2307
2308  (contemporary changes for Samoa; past changes for Kenya, Uganda, and
2309  Tanzania); there are also two spelling corrections to comments in
2310  the australasia file (with thanks to Christos Zoulas).
2311
2312
2313Release 2011i - 2011-08-29 05:56:32 -0400
2314
2315  [not summarized]
2316
2317
2318Release data2011h - 2011-06-15 18:41:48 -0400
2319
2320  Russia and Curaçao changes
2321
2322
2323Release 2011g - 2011-04-25 09:07:22 -0400
2324
2325  update the rules for Egypt to reflect its abandonment of DST this year
2326
2327
2328Release 2011f - 2011-04-06 17:14:53 -0400
2329
2330  [not summarized]
2331
2332
2333Release 2011e - 2011-03-31 16:04:38 -0400
2334
2335  Morocco, Chile, and tz-link changes
2336
2337
2338Release 2011d - 2011-03-14 09:18:01 -0400
2339
2340  changes that impact present-day time stamps in Cuba, Samoa, and Turkey
2341
2342
2343Release 2011c - 2011-03-07 09:30:09 -0500
2344
2345  These do affect current time stamps in Chile and Annette Island, Canada.
2346
2347
2348Release 2011b - 2011-02-07 08:44:50 -0500
2349
2350  [not summarized]
2351
2352
2353Release 2011a - 2011-01-24 10:30:16 -0500
2354
2355  [not summarized]
2356
2357
2358Release data2010o - 2010-11-01 09:18:23 -0400
2359
2360  change to the end of DST in Fiji in 2011
2361
2362
2363Release 2010n - 2010-10-25 08:19:17 -0400
2364
2365  [not summarized]
2366
2367
2368Release 2010m - 2010-09-27 09:24:48 -0400
2369
2370  Hong Kong, Vostok, and zic.c changes
2371
2372
2373Release 2010l - 2010-08-16 06:57:25 -0400
2374
2375  [not summarized]
2376
2377
2378Release 2010k - 2010-07-26 10:42:27 -0400
2379
2380  [not summarized]
2381
2382
2383Release 2010j - 2010-05-10 09:07:48 -0400
2384
2385  changes for Bahía de Banderas and for version naming
2386
2387
2388Release data2010i - 2010-04-16 18:50:45 -0400
2389
2390  the end of DST in Morocco on 2010-08-08
2391
2392
2393Release data2010h - 2010-04-05 09:58:56 -0400
2394
2395  [not summarized]
2396
2397
2398Release data2010g - 2010-03-24 11:14:53 -0400
2399
2400  [not summarized]
2401
2402
2403Release 2010f - 2010-03-22 09:45:46 -0400
2404
2405  [not summarized]
2406
2407
2408Release data2010e - 2010-03-08 14:24:27 -0500
2409
2410  corrects the Dhaka bug found by Danvin Ruangchan
2411
2412
2413Release data2010d - 2010-03-06 07:26:01 -0500
2414
2415  [not summarized]
2416
2417
2418Release 2010c - 2010-03-01 09:20:58 -0500
2419
2420  changes including KRE's suggestion for earlier initialization of
2421  "goahead" and "goback" structure elements
2422
2423
2424Release code2010a - 2010-02-16 10:40:04 -0500
2425
2426  [not summarized]
2427
2428
2429Release data2010b - 2010-01-20 12:37:01 -0500
2430
2431  Mexico changes
2432
2433
2434Release data2010a - 2010-01-18 08:30:04 -0500
2435
2436  changes to Dhaka
2437
2438
2439Release data2009u - 2009-12-26 08:32:28 -0500
2440
2441  changes to DST in Bangladesh
2442
2443
2444Release 2009t - 2009-12-21 13:24:27 -0500
2445
2446  [not summarized]
2447
2448
2449Release data2009s - 2009-11-14 10:26:32 -0500
2450
2451  (cosmetic) Antarctica change and the DST-in-Fiji-in-2009-and-2010 change
2452
2453
2454Release 2009r - 2009-11-09 10:10:31 -0500
2455
2456  "antarctica" and "tz-link.htm" changes
2457
2458
2459Release 2009q - 2009-11-02 09:12:40 -0500
2460
2461  with two corrections as reported by Eric Muller and Philip Newton
2462
2463
2464Release data2009p - 2009-10-23 15:05:27 -0400
2465
2466  Argentina (including San Luis) changes (with the correction from
2467  Mariano Absatz)
2468
2469
2470Release data2009o - 2009-10-14 16:49:38 -0400
2471
2472  Samoa (commentary only), Pakistan, and Bangladesh changes
2473
2474
2475Release data2009n - 2009-09-22 15:13:38 -0400
2476
2477  added commentary for Argentina and a change to the end of DST in
2478  2009 in Pakistan
2479
2480
2481Release data2009m - 2009-09-03 10:23:43 -0400
2482
2483  Samoa and Palestine changes
2484
2485
2486Release data2009l - 2009-08-14 09:13:07 -0400
2487
2488  Samoa (comments only) and Egypt
2489
2490
2491Release 2009k - 2009-07-20 09:46:08 -0400
2492
2493  [not summarized]
2494
2495
2496Release data2009j - 2009-06-15 06:43:59 -0400
2497
2498  Bangladesh change (with a short turnaround since the DST change is
2499  impending)
2500
2501
2502Release 2009i - 2009-06-08 09:21:22 -0400
2503
2504  updating for DST in Bangladesh this year
2505
2506
2507Release 2009h - 2009-05-26 09:19:14 -0400
2508
2509  [not summarized]
2510
2511
2512Release data2009g - 2009-04-20 16:34:07 -0400
2513
2514  Cairo
2515
2516
2517Release data2009f - 2009-04-10 11:00:52 -0400
2518
2519  correct DST in Pakistan
2520
2521
2522Release 2009e - 2009-04-06 09:08:11 -0400
2523
2524  [not summarized]
2525
2526
2527Release 2009d - 2009-03-23 09:38:12 -0400
2528
2529  Morocco, Tunisia, Argentina, and American Astronomical Society changes
2530
2531
2532Release data2009c - 2009-03-16 09:47:51 -0400
2533
2534  change to the start of Cuban DST
2535
2536
2537Release 2009b - 2009-02-09 11:15:22 -0500
2538
2539  [not summarized]
2540
2541
2542Release 2009a - 2009-01-21 10:09:39 -0500
2543
2544  [not summarized]
2545
2546
2547Release data2008i - 2008-10-21 12:10:25 -0400
2548
2549  southamerica and zone.tab files, with Argentina DST rule changes and
2550  United States zone reordering and recommenting
2551
2552
2553Release 2008h - 2008-10-13 07:33:56 -0400
2554
2555  [not summarized]
2556
2557
2558Release 2008g - 2008-10-06 09:03:18 -0400
2559
2560  Fix a broken HTML anchor and update Brazil's DST transitions;
2561  there's also a slight reordering of information in tz-art.htm.
2562
2563
2564Release data2008f - 2008-09-09 22:33:26 -0400
2565
2566  [not summarized]
2567
2568
2569Release 2008e - 2008-07-28 14:11:17 -0400
2570
2571  changes by Arthur David Olson and Jesper Nørgaard Welen
2572
2573
2574Release data2008d - 2008-07-07 09:51:38 -0400
2575
2576  changes by Arthur David Olson, Paul Eggert, and Rodrigo Severo
2577
2578
2579Release data2008c - 2008-05-19 17:48:03 -0400
2580
2581  Pakistan, Morocco, and Mongolia
2582
2583
2584Release data2008b - 2008-03-24 08:30:59 -0400
2585
2586  including renaming Asia/Calcutta to Asia/Kolkata, with a backward
2587  link provided
2588
2589
2590Release 2008a - 2008-03-08 05:42:16 -0500
2591
2592  [not summarized]
2593
2594
2595Release 2007k - 2007-12-31 10:25:22 -0500
2596
2597  most importantly, changes to the "southamerica" file based on
2598  Argentina's readoption of daylight saving time
2599
2600
2601Release 2007j - 2007-12-03 09:51:01 -0500
2602
2603  1. eliminate the "P" (parameter) macro;
2604
2605  2. the "noncontroversial" changes circulated on the time zone
2606  mailing list (less the changes to "logwtmp.c");
2607
2608  3. eliminate "too many transition" errors when "min" is used in time
2609  zone rules;
2610
2611  4. changes by Paul Eggert (including updated information for Venezuela).
2612
2613
2614Release data2007i - 2007-10-30 10:28:11 -0400
2615
2616  changes for Cuba and Syria
2617
2618
2619Release 2007h - 2007-10-01 10:05:51 -0400
2620
2621  changes by Paul Eggert, as well as an updated link to the ICU
2622  project in tz-link.htm
2623
2624
2625Release 2007g - 2007-08-20 10:47:59 -0400
2626
2627  changes by Paul Eggert
2628
2629  The "leapseconds" file has been updated to incorporate the most
2630  recent International Earth Rotation and Reference Systems Service
2631  (IERS) bulletin.
2632
2633  There's an addition to tz-art.htm regarding the television show "Medium".
2634
2635
2636Release 2007f - 2007-05-07 10:46:46 -0400
2637
2638  changes by Paul Eggert (including Haiti, Turks and Caicos, and New
2639  Zealand)
2640
2641  changes to zic.c to allow hour values greater than 24 (along with
2642  Paul's improved time value overflow checking)
2643
2644
2645Release 2007e - 2007-04-02 10:11:52 -0400
2646
2647  Syria and Honduras changes by Paul Eggert
2648
2649  zic.c variable renaming changes by Arthur David Olson
2650
2651
2652Release 2007d - 2007-03-20 08:48:30 -0400
2653
2654  changes by Paul Eggert
2655
2656  the elimination of white space at the ends of lines
2657
2658
2659Release 2007c - 2007-02-26 09:09:37 -0500
2660
2661  changes by Paul Eggert
2662
2663
2664Release 2007b - 2007-02-12 09:34:20 -0500
2665
2666  Paul Eggert's proposed change to the quotation handling logic in zic.c.
2667
2668  changes to the commentary in "leapseconds" reflecting the IERS
2669  announcement that there is to be no positive leap second at the end
2670  of June 2007.
2671
2672
2673Release 2007a - 2007-01-08 12:28:29 -0500
2674
2675  changes by Paul Eggert
2676
2677  Derick Rethan's Asmara change
2678
2679  Oscar van Vlijmen's Easter Island local mean time change
2680
2681  symbolic link changes
2682
2683
2684Release 2006p - 2006-11-27 08:54:27 -0500
2685
2686  changes by Paul Eggert
2687
2688
2689Release 2006o - 2006-11-06 09:18:07 -0500
2690
2691  changes by Paul Eggert
2692
2693
2694Release 2006n - 2006-10-10 11:32:06 -0400
2695
2696  changes by Paul Eggert
2697
2698
2699Release 2006m - 2006-10-02 15:32:35 -0400
2700
2701  changes for Uruguay, Palestine, and Egypt by Paul Eggert
2702
2703  (minimalist) changes to zic.8 to clarify "until" information
2704
2705
2706Release data2006l - 2006-09-18 12:58:11 -0400
2707
2708  Paul's best-effort work on this coming weekend's Egypt time change
2709
2710
2711Release 2006k - 2006-08-28 12:19:09 -0400
2712
2713  changes by Paul Eggert
2714
2715
2716Release 2006j - 2006-08-21 09:56:32 -0400
2717
2718  changes by Paul Eggert
2719
2720
2721Release code2006i - 2006-08-07 12:30:55 -0400
2722
2723  localtime.c fixes
2724
2725  Ken Pizzini's conversion script
2726
2727
2728Release code2006h - 2006-07-24 09:19:37 -0400
2729
2730  adds public domain notices to four files
2731
2732  includes a fix for transition times being off by a second
2733
2734  adds a new recording to the "arts" file (information courtesy Colin Bowern)
2735
2736
2737Release 2006g - 2006-05-08 17:18:09 -0400
2738
2739  northamerica changes by Paul Eggert
2740
2741
2742Release 2006f - 2006-05-01 11:46:00 -0400
2743
2744  a missing version number problem is fixed (with thanks to Bradley
2745  White for catching the problem)
2746
2747
2748Release 2006d - 2006-04-17 14:33:43 -0400
2749
2750  changes by Paul Eggert
2751
2752  added new items to tz-arts.htm that were found by Paul
2753
2754
2755Release 2006c - 2006-04-03 10:09:32 -0400
2756
2757  two sets of data changes by Paul Eggert
2758
2759  a fencepost error fix in zic.c
2760
2761  changes to zic.c and the "europe" file to minimize differences
2762  between output produced by the old 32-bit zic and the new 64-bit
2763  version
2764
2765
2766Release 2006b - 2006-02-20 10:08:18 -0500
2767  [tz32code2006b + tz64code2006b + tzdata2006b]
2768
2769  64-bit code
2770
2771  All SCCS IDs were bumped to "8.1" for this release.
2772
2773
2774Release 2006a - 2006-01-30 08:59:31 -0500
2775
2776  changes by Paul Eggert (in particular, Indiana time zone moves)
2777
2778  an addition to the zic manual page to describe how special-case
2779  transitions are handled
2780
2781
2782Release 2005r - 2005-12-27 09:27:13 -0500
2783
2784  Canadian changes by Paul Eggert
2785
2786  They also add "<pre>" directives to time zone data files and reflect
2787  changes to warning message logic in "zdump.c" (but with calls to
2788  "gettext" kept unbundled at the suggestion of Ken Pizzini).
2789
2790
2791Release 2005q - 2005-12-13 09:17:09 -0500
2792
2793  Nothing earth-shaking here:
2794	1.  Electronic mail addresses have been removed.
2795	2.  Casts of the return value of exit have been removed.
2796	3.  Casts of the argument of is.* macros have been added.
2797	4.  Indentation in one section of zic.c has been fixed.
2798	5.  References to dead URLs in the data files have been dealt with.
2799
2800
2801Release 2005p - 2005-12-05 10:30:53 -0500
2802
2803  "systemv", "tz-link.htm", and "zdump.c" changes
2804  (less the casts of arguments to the is* macros)
2805
2806
2807Release 2005o - 2005-11-28 10:55:26 -0500
2808
2809  Georgia, Cuba, Nicaragua, and Jordan changes by Paul Eggert
2810
2811  zdump.c lint fixes by Arthur David Olson
2812
2813
2814Release 2005n - 2005-10-03 09:44:09 -0400
2815
2816  changes by Paul Eggert (both the Uruguay changes and the Kyrgyzstan
2817  et al. changes)
2818
2819
2820Release 2005m - 2005-08-29 12:15:40 -0400
2821
2822  changes by Paul Eggert (with a small tweak to the tz-art change)
2823
2824  a declaration of an unused variable has been removed from zdump.c
2825
2826
2827Release 2005l - 2005-08-22 12:06:39 -0400
2828
2829  changes by Paul Eggert
2830
2831  overflow/underflow checks by Arthur David Olson, minus changes to
2832  the "Theory" file about the pending addition of 64-bit data (I grow
2833  less confident of the changes being accepted with each passing day,
2834  and the changes no longer increase the data files nine-fold--there's
2835  less than a doubling in size by my local Sun's reckoning)
2836
2837
2838Release 2005k - 2005-07-14 14:14:24 -0400
2839
2840  The "leapseconds" file has been edited to reflect the recently
2841  announced leap second at the end of 2005.
2842
2843  I've also deleted electronic mail addresses from the files as an
2844  anti-spam measure.
2845
2846
2847Release 2005j - 2005-06-13 14:34:13 -0400
2848
2849  These reflect changes to limit the length of time zone abbreviations
2850  and the characters used in those abbreviations.
2851
2852  There are also changes to handle POSIX-style "quoted" time zone
2853  environment variables.
2854
2855  The changes were circulated on the time zone mailing list; the only
2856  change since then was the removal of a couple of minimum-length of
2857  abbreviation checks.
2858
2859
2860Release data2005i - 2005-04-21 15:04:16 -0400
2861
2862  changes (most importantly to Nicaragua and Haiti) by Paul Eggert
2863
2864
2865Release 2005h - 2005-04-04 11:24:47 -0400
2866
2867  changes by Paul Eggert
2868
2869  minor changes to Makefile and zdump.c to produce more useful output
2870  when doing a "make typecheck"
2871
2872
2873Release 2005g - 2005-03-14 10:11:21 -0500
2874
2875  changes by Paul Eggert (a change to current DST rules in Uruguay and
2876  an update to a link to time zone software)
2877
2878
2879Release 2005f - 2005-03-01 08:45:32 -0500
2880
2881  data and documentation changes by Paul Eggert
2882
2883
2884Release 2005e - 2005-02-10 15:59:44 -0500
2885
2886  [not summarized]
2887
2888
2889Release code2005d - 2005-01-31 09:21:47 -0500
2890
2891  make zic complain about links to links if the -v flag is used
2892
2893  have "make public" do more code checking
2894
2895  add an include to "localtime.c" for the benefit of gcc systems
2896
2897
2898Release 2005c - 2005-01-17 18:36:29 -0500
2899
2900  get better results when mktime runs on a system where time_t is double
2901
2902  changes to the data files (most importantly to Paraguay)
2903
2904
2905Release 2005b - 2005-01-10 09:19:54 -0500
2906
2907  Get localtime and gmtime working on systems with exotic time_t types.
2908
2909  Update the leap second commentary in the "leapseconds" file.
2910
2911
2912Release 2005a - 2005-01-01 13:13:44 -0500
2913
2914  [not summarized]
2915
2916
2917Release code2004i - 2004-12-14 13:42:58 -0500
2918
2919  Deal with systems where time_t is unsigned.
2920
2921
2922Release code2004h - 2004-12-07 11:40:18 -0500
2923
2924  64-bit-time_t changes
2925
2926
2927Release 2004g - 2004-11-02 09:06:01 -0500
2928
2929  update to Cuba (taking effect this weekend)
2930
2931  other changes by Paul Eggert
2932
2933  correction of the spelling of Oslo
2934
2935  changed versions of difftime.c and private.h
2936
2937
2938Release code2004f - 2004-10-21 10:25:22 -0400
2939
2940  Cope with wide-ranging tm_year values.
2941
2942
2943Release 2004e - 2004-10-11 14:47:21 -0400
2944
2945  Brazil/Argentina/Israel changes by Paul Eggert
2946
2947  changes to tz-link.htm by Paul
2948
2949  one small fix to Makefile
2950
2951
2952Release 2004d - 2004-09-22 08:27:29 -0400
2953
2954  Avoid overflow problems when TM_YEAR_BASE is added to an integer.
2955
2956
2957Release 2004c - 2004-08-11 12:06:26 -0400
2958
2959  asctime-related changes
2960
2961  (variants of) some of the documentation changes suggested by Paul Eggert
2962
2963
2964Release 2004b - 2004-07-19 14:33:35 -0400
2965
2966  data changes by Paul Eggert - most importantly, updates for Argentina
2967
2968
2969Release 2004a - 2004-05-27 12:00:47 -0400
2970
2971  changes by Paul Eggert
2972
2973  Handle DST transitions that occur at the end of a month in some
2974  years but at the start of the following month in other years.
2975
2976  Add a copy of the correspondence that's the basis for claims about
2977  DST in the Navajo Nation.
2978
2979
2980Release 2003e - 2003-12-15 09:36:47 -0500
2981
2982  changes by Arthur David Olson (primarily code changes)
2983
2984  changes by Paul Eggert (primarily data changes)
2985
2986  minor changes to "Makefile" and "northamerica" (in the latter case,
2987  optimization of the "Toronto" rules)
2988
2989
2990Release 2003d - 2003-10-06 09:34:44 -0400
2991
2992  changes by Paul Eggert
2993
2994
2995Release 2003c - 2003-09-16 10:47:05 -0400
2996
2997  Fix bad returns in zic.c's inleap function.
2998  Thanks to Bradley White for catching the problem!
2999
3000
3001Release 2003b - 2003-09-16 07:13:44 -0400
3002
3003  Add a "--version" option (and documentation) to the zic and zdump commands.
3004
3005  changes to overflow/underflow checking in zic
3006
3007  a localtime typo fix.
3008
3009  Update the leapseconds and tz-art.htm files.
3010
3011
3012Release 2003a - 2003-03-24 09:30:54 -0500
3013
3014  changes by Paul Eggert
3015
3016  a few additions and modifications to the tz-art.htm file
3017
3018
3019Release 2002d - 2002-10-15 13:12:42 -0400
3020
3021  changes by Paul Eggert, less the "Britain (UK)" change in iso3166.tab
3022
3023  There's also a new time zone quote in "tz-art.htm".
3024
3025
3026Release 2002c - 2002-04-04 11:55:20 -0500
3027
3028  changes by Paul Eggert
3029
3030  Change zic.c to avoid creating symlinks to files that don't exist.
3031
3032
3033Release 2002b - 2002-01-28 12:56:03 -0500
3034
3035  [These change notes are for Release 2002a, which was corrupted.
3036  2002b was a corrected version of 2002a.]
3037
3038  changes by Paul Eggert
3039
3040  Update the "leapseconds" file to note that there'll be no leap
3041  second at the end of June, 2002.
3042
3043  Change "zic.c" to deal with a problem in handling the "Asia/Bishkek" zone.
3044
3045  Change to "difftime.c" to avoid sizeof problems.
3046
3047
3048Release 2001d - 2001-10-09 13:31:32 -0400
3049
3050  changes by Paul Eggert
3051
3052
3053Release 2001c - 2001-06-05 13:59:55 -0400
3054
3055  changes by Paul Eggert and Andrew Brown
3056
3057
3058Release 2001b - 2001-04-05 16:44:38 -0400
3059
3060  changes by Paul Eggert (modulo jnorgard's typo fix)
3061
3062  tz-art.htm has been HTMLified.
3063
3064
3065Release 2001a - 2001-03-13 12:57:44 -0500
3066
3067  changes by Paul Eggert
3068
3069  An addition to the "leapseconds" file: comments with the text of the
3070  latest IERS leap second notice.
3071
3072  Trailing white space has been removed from data file lines, and
3073  repeated spaces in "Rule Jordan" lines in the "asia" file have been
3074  converted to tabs.
3075
3076
3077Release 2000h - 2000-12-14 15:33:38 -0500
3078
3079  changes by Paul Eggert
3080
3081  one typo fix in the "art" file
3082
3083  With providence, this is the last update of the millennium.
3084
3085
3086Release 2000g - 2000-10-10 11:35:22 -0400
3087
3088  changes by Paul Eggert
3089
3090  correction of John Mackin's name submitted by Robert Elz
3091
3092  Garry Shandling's Daylight Saving Time joke (!?!) from the recent
3093  Emmy Awards broadcast.
3094
3095
3096Release 2000f - 2000-08-10 09:31:58 -0400
3097
3098  changes by Paul Eggert
3099
3100  Added information in "tz-art.htm" on a Seinfeld reference to DST.
3101
3102  Error checking and messages in the "yearistype" script have been
3103  improved.
3104
3105
3106Release 2000e - 2000-07-31 09:27:54 -0400
3107
3108  data changes by Paul Eggert
3109
3110  a change to the default value of the defined constant HAVE_STRERROR
3111
3112  the addition of a Dave Barry quote on DST to the tz-arts file
3113
3114
3115Release 2000d - 2000-04-20 15:43:04 -0400
3116
3117  changes to the documentation and code of strftime for C99 conformance
3118
3119  a bug fix for date.c
3120
3121  These are based on (though modified from) changes by Paul Eggert.
3122
3123
3124Release 2000c - 2000-03-04 10:31:43 -0500
3125
3126  changes by Paul Eggert
3127
3128
3129Release 2000b - 2000-02-21 12:16:29 -0500
3130
3131  changes by Paul Eggert and Joseph Myers
3132
3133  modest tweaks to the tz-art.htm and tz-link.htm files
3134
3135
3136Release 2000a - 2000-01-18 09:21:26 -0500
3137
3138  changes by Paul Eggert
3139
3140  The two hypertext documents have also been renamed.
3141
3142
3143Release code1999i-data1999j - 1999-11-15 18:43:22 -0500
3144
3145  Paul Eggert's changes
3146
3147  additions to the "zic" manual page and the "Arts.htm" file
3148
3149
3150Release code1999h-data1999i - 1999-11-08 14:55:21 -0500
3151
3152  [not summarized]
3153
3154
3155Release data1999h - 1999-10-07 03:50:29 -0400
3156
3157  changes by Paul Eggert to "europe" (most importantly, fixing
3158  Lithuania and Estonia)
3159
3160
3161Release 1999g - 1999-09-28 11:06:18 -0400
3162
3163  data changes by Paul Eggert (most importantly, the change for
3164  Lebanon that buys correctness for this coming Sunday)
3165
3166  The "code" file contains changes to "Makefile" and "checktab.awk" to
3167  allow better checking of time zone files before they are published.
3168
3169
3170Release 1999f - 1999-09-23 09:48:14 -0400
3171
3172  changes by Arthur David Olson and Paul Eggert
3173
3174
3175Release 1999e - 1999-08-17 15:20:54 -0400
3176
3177  changes circulated by Paul Eggert, although the change to handling
3178  of DST-specifying time zone names has been commented out for now
3179  (search for "XXX" in "localtime.c" for details).  These files also
3180  do not make any changes to the start of DST in Brazil.
3181
3182  In addition to Paul's changes, there are updates to "Arts.htm" and
3183  cleanups of URLs.
3184
3185
3186Release 1999d - 1999-03-30 11:31:07 -0500
3187
3188  changes by Paul Eggert
3189
3190  The Makefile's "make public" rule has also been changed to do a test
3191  compile of each individual time zone data file (which should help
3192  avoid problems such as the one we had with Nicosia).
3193
3194
3195Release 1999c - 1999-03-25 09:47:47 -0500
3196
3197  changes by Paul Eggert, most importantly the change for Chile.
3198
3199
3200Release 1999b - 1999-02-01 17:51:44 -0500
3201
3202  changes by Paul Eggert
3203
3204  code changes (suggested by Mani Varadarajan, mani at be.com) for
3205  correct handling of symbolic links when building using a relative directory
3206
3207  code changes to generate correct messages for failed links
3208
3209  updates to the URLs in Arts.htm
3210
3211
3212Release 1999a - 1999-01-19 16:20:29 -0500
3213
3214  error message internationalizations and corrections in zic.c and
3215  zdump.c (as suggested by Vladimir Michl, vladimir.michl at upol.cz,
3216  to whom thanks!)
3217
3218
3219Release code1998h-data1998i - 1998-10-01 09:56:10 -0400
3220
3221  changes for Brazil, Chile, and Germany
3222
3223  support for use of "24:00" in the input files for the time zone compiler
3224
3225
3226Release code1998g-data1998h - 1998-09-24 10:50:28 -0400
3227
3228  changes by Paul Eggert
3229
3230  correction to a define in the "private.h" file
3231
3232
3233Release data1998g - 1998-08-11 03:28:35 -0000
3234  [tzdata1998g.tar.gz is missing!]
3235
3236  Lithuanian change provided by mgedmin at pub.osf.it
3237
3238  Move creation of the GMT link with Etc/GMT to "etcetera" (from
3239  "backward") to ensure that the GMT file is created even where folks
3240  don't want the "backward" links (as suggested by Paul Eggert).
3241
3242
3243Release data1998f - 1998-07-20 13:50:00 -0000
3244  [tzdata1998f.tar.gz is missing!]
3245
3246  Update the "leapseconds" file to include the newly-announced
3247  insertion at the end of 1998.
3248
3249
3250Release code1998f - 1998-06-01 10:18:31 -0400
3251
3252  addition to localtime.c by Guy Harris
3253
3254
3255Release 1998e - 1998-05-28 09:56:26 -0400
3256
3257  The Makefile is changed to produce zoneinfo-posix rather than
3258  zoneinfo/posix, and to produce zoneinfo-leaps rather than
3259  zoneinfo/right.
3260
3261  data changes by Paul Eggert
3262
3263  changes from Guy Harris to provide asctime_r and ctime_r
3264
3265  A usno1998 file (substantially identical to usno1997) has been added.
3266
3267
3268Release 1998d - 1998-05-14 11:58:34 -0400
3269
3270  changes to comments (in particular, elimination of references to CIA maps).
3271  "Arts.htm", "WWW.htm", "asia", and "australasia" are the only places
3272  where changes occur.
3273
3274
3275Release 1998c - 1998-02-28 12:32:26 -0500
3276
3277  changes by Paul Eggert (save the "French correction," on which I'll
3278  wait for the dust to settle)
3279
3280  symlink changes
3281
3282  changes and additions to Arts.htm
3283
3284
3285Release 1998b - 1998-01-17 14:31:51 -0500
3286
3287  URL cleanups and additions
3288
3289
3290Release 1998a - 1998-01-13 12:37:35 -0500
3291
3292  changes by Paul Eggert
3293
3294
3295Release code1997i-data1997k - 1997-12-29 09:53:41 -0500
3296
3297  changes by Paul Eggert, with minor modifications from Arthur David
3298  Olson to make the files more browser friendly
3299
3300
3301Release code1997h-data1997j - 1997-12-18 17:47:35 -0500
3302
3303  minor changes to put "TZif" at the start of each time zone information file
3304
3305  a rule has also been added to the Makefile so you can
3306	make zones
3307  to just recompile the zone information files (rather than doing a
3308  full "make install" with its other effects).
3309
3310
3311Release data1997i - 1997-10-07 08:45:38 -0400
3312
3313  changes to Africa by Paul Eggert
3314
3315
3316Release code1997g-data1997h - 1997-09-04 16:56:54 -0400
3317
3318  corrections for Uruguay (and other locations)
3319
3320  Arthur David Olson's simple-minded fix allowing mktime to both
3321  correctly handle leap seconds and correctly handle tm_sec values
3322  upon which arithmetic has been performed.
3323
3324
3325Release code1997f-data1997g - 1997-07-19 13:15:02 -0400
3326
3327  Paul Eggert's updates
3328
3329  a small change to a function prototype;
3330
3331  "Music" has been renamed "Arts.htm", HTMLified, and augmented to
3332  include information on Around the World in Eighty Days.
3333
3334
3335Release code1997e-data1997f - 1997-05-03 18:52:34 -0400
3336
3337  fixes to zic's error handling
3338
3339  changes inspired by the item circulated on Slovenia
3340
3341  The description of Web resources has been HTMLified for browsing
3342  convenience.
3343
3344  A new piece of tz-related music has been added to the "Music" file.
3345
3346
3347Release code1997d-data1997e - 1997-03-29 12:48:52 -0500
3348
3349  Paul Eggert's latest suggestions
3350
3351
3352Release code1997c-data1997d - 1997-03-07 20:37:54 -0500
3353
3354  changes to "zic.c" to correct performance of the "-s" option
3355
3356  a new file "usno1997"
3357
3358
3359Release data1997c - 1997-03-04 09:58:18 -0500
3360
3361  changes in Israel
3362
3363
3364Release 1997b - 1997-02-27 18:34:19 -0500
3365
3366  The data file incorporates the 1997 leap second.
3367
3368  The code file incorporates Arthur David Olson's take on the
3369  zic/multiprocessor/directory-creation situation.
3370
3371
3372Release 1997a - 1997-01-21 09:11:10 -0500
3373
3374  Paul Eggert's Antarctica (and other changes)
3375
3376  Arthur David Olson finessed the "getopt" issue by checking against
3377  both -1 and EOF (regardless of POSIX, SunOS 4.1.1's manual says -1
3378  is returned while SunOS 5.5's manual says EOF is returned).
3379
3380
3381Release code1996o-data1996n - 1996-12-27 21:42:05 -0500
3382
3383  Paul Eggert's latest changes
3384
3385
3386Release code1996n - 1996-12-16 09:42:02 -0500
3387
3388  link snapping fix from Bruce Evans (via Garrett Wollman)
3389
3390
3391Release data1996m - 1996-11-24 02:37:34 -0000
3392  [tzdata1996m.tar.gz is missing!]
3393
3394  Paul Eggert's batch of changes
3395
3396
3397Release code1996m-data1996l - 1996-11-05 14:00:12 -0500
3398
3399  No functional changes here; the files have simply been changed to
3400  make more use of ISO style dates in comments. The names of the above
3401  files now include the year in full.
3402
3403
3404Release code96l - 1996-09-08 17:12:20 -0400
3405
3406  tzcode96k was missing a couple of pieces.
3407
3408
3409Release 96k - 1996-09-08 16:06:22 -0400
3410
3411  the latest round of changes from Paul Eggert
3412
3413  the recent Year 2000 material
3414
3415
3416Release code96j - 1996-07-30 13:18:53 -0400
3417
3418  Set sp->typecnt as suggested by Timothy Patrick Murphy.
3419
3420
3421Release code96i - 1996-07-27 20:11:35 -0400
3422
3423  Paul's suggested patch for strftime %V week numbers
3424
3425
3426Release data96i - 1996-07-01 18:13:04 -0400
3427
3428  "northamerica" and "europe" changes by Paul Eggert
3429
3430
3431Release code96h - 1996-06-05 08:02:21 -0400
3432
3433  fix for handling transitions specified in Universal Time
3434
3435  Some "public domain" notices have also been added.
3436
3437
3438Release code96g - 1996-05-16 14:00:26 -0400
3439
3440  fix for the simultaneous-DST-and-zone-change challenge
3441
3442
3443Release data96h - 1996-05-09 17:40:51 -0400
3444
3445  changes by Paul Eggert
3446
3447
3448Release code96f-data96g - 1996-05-03 03:09:59 -0000
3449  [tzcode96f.tar.gz + tzdata96g.tar.gz are both missing!]
3450
3451  The changes get us some of the way to fixing the problems noted in Paul
3452  Eggert's letter yesterday (in addition to a few others).  The approach
3453  has been to make zic a bit smarter about figuring out what time zone
3454  abbreviations apply just after the time specified in the "UNTIL" part
3455  of a zone line.  Putting the smarts in zic means avoiding having
3456  transition times show up in both "Zone" lines and "Rule" lines, which
3457  in turn avoids multiple transition time entries in time zone files.
3458  (This also makes the zic input files such as "europe" a bit shorter and
3459  should ease maintenance.)
3460
3461
3462Release data96f - 1996-04-19 19:20:03 -0000
3463  [tzdata96f.tar.gz is missing!]
3464
3465  The only changes are to the "northamerica" file; the time zone
3466  abbreviation for Denver is corrected to MST (and MDT), and the
3467  comments for Mexico have been updated.
3468
3469
3470Release data96e - 1996-03-19 17:37:26 -0500
3471
3472  Proposals by Paul Eggert, in particular the Portugal change that
3473  comes into play at the end of this month.
3474
3475
3476Release data96d - 1996-03-18 20:49:39 -0500
3477
3478  [not summarized]
3479
3480
3481Release code96e - 1996-02-29 15:43:27 -0000
3482  [tzcode96e.tar.gz is missing!]
3483
3484  internationalization changes and the fix to the documentation for strftime
3485
3486
3487Release code96d-data96c - 1996-02-12 11:05:27 -0500
3488
3489  The "code" file simply updates Bob Kridle's electronic address.
3490
3491  The "data" file updates rules for Mexico.
3492
3493
3494Release data96b - 1996-01-27 15:44:42 -0500
3495
3496  Kiribati change
3497
3498
3499Release code96c - 1996-01-16 16:58:15 -0500
3500
3501  leap-year streamlining and binary-search changes
3502
3503  fix to newctime.3
3504
3505
3506Release code96b - 1996-01-10 20:42:39 -0500
3507
3508  fixes and enhancements from Paul Eggert, including code that
3509  emulates the behavior of recent versions of the SunOS "date"
3510  command.
3511
3512
3513Release 96a - 1996-01-06 09:08:24 -0500
3514
3515  Israel updates
3516
3517  fixes to strftime.c for correct ISO 8601 week number generation,
3518  plus support for two new formats ('G' and 'g') to give ISO 8601 year
3519  numbers (which are not necessarily the same as calendar year numbers)
3520
3521
3522Release code95i-data95m - 1995-12-21 12:46:47 -0500
3523
3524  The latest revisions from Paul Eggert are included, the usno1995
3525  file has been updated, and a new file ("WWW") covering useful URLs
3526  has been added.
3527
3528
3529Release code95h-data95l - 1995-12-19 18:10:12 -0500
3530
3531  A simplification of a macro definition, a change to data for Sudan,
3532  and (for last minute shoppers) notes in the "Music" file on the CD
3533  "Old Man Time".
3534
3535
3536Release code95g-data95k - 1995-10-30 10:32:47 -0500
3537
3538  (slightly reformatted) 8-bit-clean proposed patch
3539
3540  minor patch: US/Eastern -> America/New_York
3541
3542  snapshot of the USNO's latest data ("usno1995")
3543
3544  some other minor cleanups
3545
3546
3547Release code95f-data95j - 1995-10-28 21:01:34 -0000
3548  [tzcode95f.tar.gz + tzdata95j.tar.gz are both missing!]
3549
3550  European cleanups
3551
3552  support for 64-bit time_t's
3553
3554  optimization in localtime.c
3555
3556
3557Release code95e - 1995-10-13 13:23:57 -0400
3558
3559  the mktime change to scan from future to past when trying to find time zone
3560  offsets
3561
3562
3563Release data95i - 1995-09-26 10:43:26 -0400
3564
3565  For Canada/Central, guess that the Sun customer's "one week too
3566  early" was just a approximation, and the true error is one month
3567  too early.  This is consistent with the rest of Canada.
3568
3569
3570Release data95h - 1995-09-21 11:26:48 -0400
3571
3572  latest changes from Paul Eggert
3573
3574
3575Release code95d - 1995-09-14 11:14:45 -0400
3576
3577  the addition of a "Music" file, which documents four recorded
3578  versions of the tune "Save That Time".
3579
3580
3581Release data95g - 1995-09-01 17:21:36 -0400
3582
3583  "yearistype" correction
3584
3585
3586Release data95f - 1995-08-28 20:46:56 -0400
3587
3588  Paul Eggert's change to the australasia file
3589
3590
3591Release data95e - 1995-07-08 18:02:34 -0400
3592
3593  The only change is a leap second at the end of this year.
3594  Thanks to Bradley White for forwarding news on the leap second.
3595
3596
3597Release data95d - 1995-07-03 13:26:22 -0400
3598
3599  Paul Eggert's changes
3600
3601
3602Release data95c - 1995-07-02 19:19:28 -0400
3603
3604  changes to "asia", "backward", "europe", and "southamerica"
3605  (read: northamericacentrics need not apply)
3606
3607
3608Release code95c - 1995-03-13 14:00:46 -0500
3609
3610  one-line fix for sign extension problems in detzcode
3611
3612
3613Release 95b - 1995-03-04 11:22:38 -0500
3614
3615  Minor changes in both:
3616
3617  The "code" file contains a workaround for the lack of "unistd.h" in
3618  Microsoft C++ version 7.
3619
3620  The "data" file contains a fixed "Link" for America/Shiprock.
3621
3622
3623Release 94h - 1994-12-10 12:51:14 -0500
3624
3625  The files:
3626
3627  *	incorporate the changes to "zdump" and "date" to make changes to
3628	the "TZ" environment variable permanent;
3629
3630  *	incorporate the table changes by Paul Eggert;
3631
3632  *	include (and document) support for universal time specifications in
3633	data files - but do not (yet) include use of this feature in the
3634	data files.
3635
3636  Think of this as "TZ Classic" - the software has been set up not to break if
3637  universal time shows up in its input, and data entries have been
3638  left as is so as not to break existing implementations.
3639
3640
3641Release data94f - 1994-08-20 12:56:09 -0400
3642
3643  (with thanks!) the latest data updates from Paul Eggert
3644
3645
3646Release data94e - 1994-06-04 13:13:53 -0400
3647
3648  [not summarized]
3649
3650
3651Release code94g - 1994-05-05 12:14:07 -0400
3652
3653  fix missing "optind.c" and a reference to it in the Makefile
3654
3655
3656Release code94f - 1994-05-05 13:00:33 -0000
3657  [tzcode94f.tar.gz is missing!]
3658
3659  changes to avoid overflow in difftime, as well as changes to cope
3660  with the 52/53 challenge in strftime
3661
3662
3663Release code94e - 1994-03-30 23:32:59 -0500
3664
3665  change for the benefit of PCTS
3666
3667
3668Release 94d - 1994-02-24 15:42:25 -0500
3669
3670  Avoid clashes with POSIX semantics for zones such as GMT+4.
3671
3672  Some other very minor housekeeping is also present.
3673
3674
3675Release code94c - 1994-02-10 08:52:40 -0500
3676
3677  Fix bug where mkdirs was broken unless you compile with
3678  -fwritable-strings (which is generally losing to do).
3679
3680
3681Release 94b - 1994-02-07 10:04:33 -0500
3682
3683  work by Paul Eggert who notes:
3684
3685  I found another book of time zone histories by E W Whitman; it's not
3686  as extensive as Shanks but has a few goodies of its own.  I used it
3687  to update the tables.  I also fixed some more as a result of
3688  correspondence with Adam David and Peter Ilieve, and move some stray
3689  links from 'europe' to 'backward'.  I corrected some scanning errors
3690  in usno1989.
3691
3692  As far as the code goes, I fixed zic to allow years in the range
3693  INT_MIN to INT_MAX; this fixed a few boundary conditions around 1900.
3694  And I cleaned up the zic documentation a little bit.
3695
3696
3697Release data94a - 1994-02-03 08:58:54 -0500
3698
3699  It simply incorporates the recently announced leap second into the
3700  "leapseconds" file.
3701
3702
3703Release 93g - 1993-11-22 17:28:27 -0500
3704
3705  Paul Eggert has provided a good deal of historic information (based
3706  on Shanks), and there are some code changes to deal with the buglets
3707  that crawled out in dealing with the new information.
3708
3709
3710Release 93f - 1993-10-15 12:27:46 -0400
3711
3712  Paul Eggert's changes
3713
3714
3715Release 93e - 1993-09-05 21:21:44 -0400
3716
3717  This has updated data for Israel, England, and Kwajalein.  There's
3718  also an update to "zdump" to cope with Kwajalein's 24-hour jump.
3719  Thanks to Paul Eggert and Peter Ilieve for the changes.
3720
3721
3722Release 93d - 1993-06-17 23:34:17 -0400
3723
3724  new fix and new data on Israel
3725
3726
3727Release 93c - 1993-06-06 19:31:55 -0400
3728
3729  [not summarized]
3730
3731
3732Release 93b - 1993-02-02 14:53:58 -0500
3733
3734  updated "leapseconds" file
3735
3736
3737Release 93 - 1993-01-08 07:01:06 -0500
3738
3739  At kre's suggestion, the package has been split in two - a code piece
3740  (which also includes documentation) that's only of use to folks who
3741  want to recompile things and a data piece useful to anyone who can
3742  run "zic".
3743
3744  The new version has a few changes to the data files, a few
3745  portability changes, and an off-by-one fix (with thanks to
3746  Tom Karzes at deshaw.com for providing a description and a
3747  solution).
3748
3749
3750Release 92c - 1992-11-21 17:35:36 -0000
3751  [tz92c.tar.Z is missing!]
3752
3753  The fallout from the latest round of DST transitions.
3754
3755  There are changes for Portugal, Saskatchewan, and "Pacific-New";
3756  there's also a change to "zic.c" that makes it portable to more systems.
3757
3758
3759Release 92 - 1992-04-25 18:17:03 -0000
3760  [tz92.tar.Z is missing!]
3761
3762  By popular demand (well, at any rate, following a request by kre at munnari)
3763
3764
3765The 1989 update of the time zone package featured:
3766
3767  *	POSIXization (including interpretation of POSIX-style TZ environment
3768	variables, provided by Guy Harris),
3769  *	ANSIfication (including versions of "mktime" and "difftime"),
3770  *	SVIDulation (an "altzone" variable)
3771  *	MACHination (the "gtime" function)
3772  *	corrections to some time zone data (including corrections to the rules
3773	for Great Britain and New Zealand)
3774  *	reference data from the United States Naval Observatory for folks who
3775	want to do additional time zones
3776  *	and the 1989 data for Saudi Arabia.
3777
3778  (Since this code will be treated as "part of the implementation" in some
3779  places and as "part of the application" in others, there's no good way to
3780  name functions, such as timegm, that are not part of the proposed ANSI C
3781  standard; such functions have kept their old, underscore-free names in this
3782  update.)
3783
3784  And the "dysize" function has disappeared; it was present to allow
3785  compilation of the "date" command on old BSD systems, and a version of "date"
3786  is now provided in the package.  The "date" command is not created when you
3787  "make all" since it may lack options provided by the version distributed with
3788  your operating system, or may not interact with the system in the same way
3789  the native version does.
3790
3791  Since POSIX frowns on correct leap second handling, the default behavior of
3792  the "zic" command (in the absence of a "-L" option) has been changed to omit
3793  leap second information from its output files.
3794
3795
3796-----
3797Notes
3798
3799This file contains copies of the part of each release announcement
3800that talks about the changes in that release.  The text has been
3801adapted and reformatted for the purposes of this file.
3802
3803Traditionally a release R consists of a pair of tarball files,
3804tzcodeR.tar.gz and tzdataR.tar.gz.  However, some releases (e.g.,
3805code2010a, data2012c) consist of just one or the other tarball, and a
3806few (e.g., code2012c-data2012d) have tarballs with mixed version
3807numbers.  Recent releases also come in an experimental format
3808consisting of a single tarball tzdb-R.tar.lz with extra data.
3809
3810Release time stamps are taken from the release's commit (for newer,
3811Git-based releases), from the newest file in the tarball (for older
3812releases, where this info is available) or from the email announcing
3813the release (if all else fails; these are marked with a time zone of
3814-0000 and an "is missing!" comment).
3815
3816Earlier versions of the code and data were not announced on the tz
3817list and are not summarized here.
3818
3819This file is in the public domain.
3820
3821Local Variables:
3822coding: utf-8
3823End:
3824