1 News for the tz database
3 Unreleased, experimental changes
5 Changes to past time stamps
7 Liberia changed from -004430 to +00 on 1972-01-07, not 1972-05-01.
9 Use "MMT" to abbreviate Liberia's time zone before 1972, as "-004430"
10 is one byte over the POSIX limit. (Problem reported by Derick Rethans.)
13 Release 2017a - 2017-02-28 00:05:36 -0800
15 Briefly: Southern Chile moves from -04/-03 to -03, and Mongolia
18 Changes to future time stamps
20 Mongolia no longer observes DST. (Thanks to Ganbold Tsagaankhuu.)
22 Chile's Region of Magallanes moves from -04/-03 to -03 year-round.
23 Its clocks diverge from America/Santiago starting 2017-05-13 at
24 23:00, hiving off a new zone America/Punta_Arenas. Although the
25 Chilean government says this change expires in May 2019, for now
26 assume it's permanent. (Thanks to Juan Correa and Deborah
27 Goldsmith.) This also affects Antarctica/Palmer.
29 Changes to past time stamps
31 Fix many entries for historical time stamps for Europe/Madrid
32 before 1979, to agree with tables compiled by Pere Planesas of the
33 National Astronomical Observatory of Spain. As a side effect,
34 this changes some time stamps for Africa/Ceuta before 1929, which
35 are probably guesswork anyway. (Thanks to Steve Allen and
36 Pierpaolo Bernardi for the heads-ups, and to Michael Deckers for
37 correcting the 1901 transition.)
39 Ecuador observed DST from 1992-11-28 to 1993-02-05.
40 (Thanks to Alois Treindl.)
42 Asia/Atyrau and Asia/Oral were at +03 (not +04) before 1930-06-21.
43 (Thanks to Stepan Golosunov.)
45 Changes to past and future time zone abbreviations
47 Switch to numeric time zone abbreviations for South America, as
48 part of the ongoing project of removing invented abbreviations.
49 This avoids the need to invent an abbreviation for the new Chilean
50 new zone. Similarly, switch from invented to numeric time zone
51 abbreviations for Afghanistan, American Samoa, the Azores,
52 Bangladesh, Bhutan, the British Indian Ocean Territory, Brunei,
53 Cape Verde, Chatham Is, Christmas I, Cocos (Keeling) Is, Cook Is,
54 Dubai, East Timor, Eucla, Fiji, French Polynesia, Greenland,
55 Indochina, Iran, Iraq, Kiribati, Lord Howe, Macquarie, Malaysia,
56 the Maldives, Marshall Is, Mauritius, Micronesia, Mongolia,
57 Myanmar, Nauru, Nepal, New Caledonia, Niue, Norfolk I, Palau,
58 Papua New Guinea, the Philippines, Pitcairn, Qatar, Réunion, St
59 Pierre & Miquelon, Samoa, Saudi Arabia, Seychelles, Singapore,
60 Solomon Is, Tokelau, Tuvalu, Wake, Vanuatu, Wallis & Futuna, and
61 Xinjiang; for 20-minute daylight saving time in Ghana before 1943;
62 for half-hour daylight saving time in Belize before 1944 and in
63 the Dominican Republic before 1975; and for Canary Islands before
64 1946, for Guinea-Bissau before 1975, for Iceland before 1969, for
65 Indian Summer Time before 1942, for Indonesia before around 1964,
66 for Kenya before 1960, for Liberia before 1973, for Madeira before
67 1967, for Namibia before 1943, for the Netherlands in 1937-9, for
68 Pakistan before 1971, for Western Sahara before 1977, and for
69 Zaporozhye in 1880-1924.
71 For Alaska time from 1900 through 1967, instead of "CAT" use the
72 abbreviation "AST", the abbreviation commonly used at the time
73 (Atlantic Standard Time had not been standardized yet). Use "AWT"
74 and "APT" instead of the invented abbreviations "CAWT" and "CAPT".
76 Use "CST" and "CDT" instead of invented abbreviations for Macau
77 before 1999 and Taiwan before 1938, and use "JST" instead of the
78 invented abbreviation "JCST" for Japan and Korea before 1938.
80 Change to database entry category
82 Move the Pacific/Johnston link from 'australasia' to 'backward',
83 since Johnston is now uninhabited.
87 zic no longer mishandles some transitions in January 2038 when it
88 attempts to work around Qt bug 53071. This fixes a bug affecting
89 Pacific/Tongatapu that was introduced in zic 2016e. localtime.c
90 now contains a workaround, useful when loading a file generated by
91 a buggy zic. (Problem and localtime.c fix reported by Bradley
94 zdump -i now outputs non-hour numeric time zone abbreviations
95 without a colon, e.g., "+0530" rather than "+05:30". This agrees
96 with zic %z and with common practice, and simplifies auditing of
99 zdump is now buildable again with -DUSE_LTZ=0.
100 (Problem reported by Joseph Myers.)
102 zdump.c now always includes private.h, to avoid code duplication
103 with private.h. (Problem reported by Kees Dekker.)
105 localtime.c no longer mishandles early or late timestamps
106 when TZ is set to a POSIX-style string that specifies DST.
107 (Problem reported by Kees Dekker.)
109 date and strftime now cause %z to generate "-0000" instead of
110 "+0000" when the UT offset is zero and the time zone abbreviation
113 Changes to documentation and commentary
115 The 'Theory' file now better documents choice of historical time
116 zone abbreviations. (Problems reported by Michael Deckers.)
118 tz-link.htm now covers leap smearing, which is popular in clouds.
121 Release 2016j - 2016-11-22 23:17:13 -0800
123 Briefly: Saratov, Russia moves from +03 to +04 on 2016-12-04.
125 Changes to future time stamps
127 Saratov, Russia switches from +03 to +04 on 2016-12-04 at 02:00.
128 This hives off a new zone Europe/Saratov from Europe/Volgograd.
129 (Thanks to Yuri Konotopov and Stepan Golosunov.)
131 Changes to past time stamps
133 The new zone Asia/Atyrau for Atyraū Region, Kazakhstan, is like
134 Asia/Aqtau except it switched from +05/+06 to +04/+05 in spring
135 1999, not fall 1994. (Thanks to Stepan Golosunov.)
137 Changes to past time zone abbreviations
139 Asia/Gaza and Asia/Hebron now use "EEST", not "EET", to denote
140 summer time before 1948. The old use of "EET" was a typo.
144 zic no longer mishandles file systems that lack hard links, fixing
145 bugs introduced in 2016g. (Problems reported by Tom Lane.)
146 Also, when the destination already contains symbolic links, zic
147 should now work better on systems where the 'link' system call
148 does not follow symbolic links.
150 Changes to documentation and commentary
152 tz-link.htm now documents the relationship between release version
153 numbers and development-repository commit tags. (Suggested by
156 The 'Theory' file now documents UT.
158 iso3166.tab now accents "Curaçao", and commentary now mentions
159 the names "Cabo Verde" and "Czechia". (Thanks to Jiří Boháč.)
162 Release 2016i - 2016-11-01 23:19:52 -0700
164 Briefly: Cyprus split into two time zones on 2016-10-30, and Tonga
165 reintroduces DST on 2016-11-06.
167 Changes to future time stamps
169 Pacific/Tongatapu begins DST on 2016-11-06 at 02:00, ending on
170 2017-01-15 at 03:00. Assume future observances in Tonga will be
171 from the first Sunday in November through the third Sunday in
172 January, like Fiji. (Thanks to Pulu ʻAnau.) Switch to numeric
173 time zone abbreviations for this zone.
175 Changes to past and future time stamps
177 Northern Cyprus is now +03 year round, causing a split in Cyprus
178 time zones starting 2016-10-30 at 04:00. This creates a zone
179 Asia/Famagusta. (Thanks to Even Scharning and Matt Johnson.)
181 Antarctica/Casey switched from +08 to +11 on 2016-10-22.
182 (Thanks to Steffen Thorsen.)
184 Changes to past time stamps
186 Several corrections were made for pre-1975 time stamps in Italy.
187 These affect Europe/Malta, Europe/Rome, Europe/San_Marino, and
190 First, the 1893-11-01 00:00 transition in Italy used the new UT
191 offset (+01), not the old (+00:49:56). (Thanks to Michael
194 Second, rules for daylight saving in Italy were changed to agree
195 with Italy's National Institute of Metrological Research (INRiM)
196 except for 1944, as follows (thanks to Pierpaolo Bernardi, Brian
197 Inglis, and Michael Deckers):
199 The 1916-06-03 transition was at 24:00, not 00:00.
201 The 1916-10-01, 1919-10-05, and 1920-09-19 transitions were at
204 The 1917-09-30 and 1918-10-06 transitions were at 24:00, not
207 The 1944-09-17 transition was at 03:00, not 01:00. This
208 particular change is taken from Italian law as INRiM's table,
209 (which says 02:00) appears to have a typo here. Also, keep the
210 1944-04-03 transition for Europe/Rome, as Rome was controlled by
213 The 1967-1970 and 1972-1974 fallback transitions were at 01:00,
218 The code should now be buildable on AmigaOS merely by setting the
219 appropriate Makefile variables. (From a patch by Carsten Larsen.)
222 Release 2016h - 2016-10-19 23:17:57 -0700
224 Changes to future time stamps
226 Asia/Gaza and Asia/Hebron end DST on 2016-10-29 at 01:00, not
227 2016-10-21 at 00:00. (Thanks to Sharef Mustafa.) Predict that
228 future fall transitions will be on the last Saturday of October
229 at 01:00, which is consistent with predicted spring transitions
230 on the last Saturday of March. (Thanks to Tim Parenti.)
232 Changes to past time stamps
234 In Turkey, transitions in 1986-1990 were at 01:00 standard time
235 not at 02:00, and the spring 1994 transition was on March 20, not
236 March 27. (Thanks to Kıvanç Yazan.)
238 Changes to past and future time zone abbreviations
240 Asia/Colombo now uses numeric time zone abbreviations like "+0530"
241 instead of alphabetic ones like "IST" and "LKT". Various
242 English-language sources use "IST", "LKT" and "SLST", with no
243 working consensus. (Usage of "SLST" mentioned by Sadika
248 zic no longer mishandles relativizing file names when creating
249 symbolic links like /etc/localtime, when these symbolic links
250 are outside the usual directory hierarchy. This fixes a bug
251 introduced in 2016g. (Problem reported by Andreas Stieger.)
253 Changes to build procedure
255 New rules 'traditional_tarballs' and 'traditional_signatures' for
256 building just the traditional-format distribution. (Requested by
259 The file 'version' is now put into the tzdata tarball too.
260 (Requested by Howard Hinnant.)
262 Changes to documentation and commentary
264 The 'Theory' file now has a section on interface stability.
265 (Requested by Paul Koning.) It also mentions features like
266 tm_zone and localtime_rz that have long been supported by the
269 tz-link.htm has improved coverage of time zone boundaries suitable
270 for geolocation. (Thanks to heads-ups from Evan Siroky and Matt
273 The US commentary now mentions Allen and the "day of two noons".
275 The Fiji commentary mentions the government's 2016-10-03 press
276 release. (Thanks to Raymond Kumar.)
279 Release 2016g - 2016-09-13 08:56:38 -0700
281 Changes to future time stamps
283 Turkey switched from EET/EEST (+02/+03) to permanent +03,
284 effective 2016-09-07. (Thanks to Burak AYDIN.) Use "+03" rather
285 than an invented abbreviation for the new time.
287 New leap second 2016-12-31 23:59:60 UTC as per IERS Bulletin C 52.
288 (Thanks to Tim Parenti.)
290 Changes to past time stamps
292 For America/Los_Angeles, spring-forward transition times have been
293 corrected from 02:00 to 02:01 in 1948, and from 02:00 to 01:00 in
296 For zones using Soviet time on 1919-07-01, transitions to UT-based
297 time were at 00:00 UT, not at 02:00 local time. The affected
298 zones are Europe/Kirov, Europe/Moscow, Europe/Samara, and
299 Europe/Ulyanovsk. (Thanks to Alexander Belopolsky.)
301 Changes to past and future time zone abbreviations
303 The Factory zone now uses the time zone abbreviation -00 instead
304 of a long English-language string, as -00 is now the normal way to
305 represent an undefined time zone.
307 Several zones in Antarctica and the former Soviet Union, along
308 with zones intended for ships at sea that cannot use POSIX TZ
309 strings, now use numeric time zone abbreviations instead of
310 invented or obsolete alphanumeric abbreviations. The affected
311 zones are Antarctica/Casey, Antarctica/Davis,
312 Antarctica/DumontDUrville, Antarctica/Mawson, Antarctica/Rothera,
313 Antarctica/Syowa, Antarctica/Troll, Antarctica/Vostok,
314 Asia/Anadyr, Asia/Ashgabat, Asia/Baku, Asia/Bishkek, Asia/Chita,
315 Asia/Dushanbe, Asia/Irkutsk, Asia/Kamchatka, Asia/Khandyga,
316 Asia/Krasnoyarsk, Asia/Magadan, Asia/Omsk, Asia/Sakhalin,
317 Asia/Samarkand, Asia/Srednekolymsk, Asia/Tashkent, Asia/Tbilisi,
318 Asia/Ust-Nera, Asia/Vladivostok, Asia/Yakutsk, Asia/Yekaterinburg,
319 Asia/Yerevan, Etc/GMT-14, Etc/GMT-13, Etc/GMT-12, Etc/GMT-11,
320 Etc/GMT-10, Etc/GMT-9, Etc/GMT-8, Etc/GMT-7, Etc/GMT-6, Etc/GMT-5,
321 Etc/GMT-4, Etc/GMT-3, Etc/GMT-2, Etc/GMT-1, Etc/GMT+1, Etc/GMT+2,
322 Etc/GMT+3, Etc/GMT+4, Etc/GMT+5, Etc/GMT+6, Etc/GMT+7, Etc/GMT+8,
323 Etc/GMT+9, Etc/GMT+10, Etc/GMT+11, Etc/GMT+12, Europe/Kaliningrad,
324 Europe/Minsk, Europe/Samara, Europe/Volgograd, and
325 Indian/Kerguelen. For Europe/Moscow the invented abbreviation MSM
326 was replaced by +05, whereas MSK and MSD were kept as they are not
327 our invention and are widely used.
329 Changes to zone names
331 Rename Asia/Rangoon to Asia/Yangon, with a backward compatibility link.
332 (Thanks to David Massoud.)
336 zic no longer generates binary files containing POSIX TZ-like
337 strings that disagree with the local time type after the last
338 explicit transition in the data. This fixes a bug with
339 Africa/Casablanca and Africa/El_Aaiun in some year-2037 time
340 stamps on the reference platform. (Thanks to Alexander Belopolsky
341 for reporting the bug and suggesting a way forward.)
343 If the installed localtime and/or posixrules files are symbolic
344 links, zic now keeps them symbolic links when updating them, for
345 compatibility with platforms like OpenSUSE where other programs
346 configure these files as symlinks.
348 zic now avoids hard linking to symbolic links, avoids some
349 unnecessary mkdir and stat system calls, and uses shorter file
352 zdump has a new -i option to generate transitions in a
353 more-compact but still human-readable format. This option is
354 experimental, and the output format may change in future versions.
355 (Thanks to Jon Skeet for suggesting that an option was needed,
356 and thanks to Tim Parenti and Chris Rovick for further comments.)
358 Changes to build procedure
360 An experimental distribution format is available, in addition
361 to the traditional format which will continue to be distributed.
362 The new format is a tarball tzdb-VERSION.tar.lz with signature
363 file tzdb-VERSION.tar.lz.asc. It unpacks to a top-level directory
364 tzdb-VERSION containing the code and data of the traditional
365 two-tarball format, along with extra data that may be useful.
366 (Thanks to Antonio Diaz Diaz, Oscar van Vlijmen, and many others
367 for comments about the experimental format.)
369 The release version number is now more accurate in the usual case
370 where releases are built from a Git repository. For example, if
371 23 commits and some working-file changes have been made since
372 release 2016g, the version number is now something like
373 '2016g-23-g50556e3-dirty' instead of the misleading '2016g'.
374 Tagged releases use the same version number format as before,
375 e.g., '2016g'. To support the more-accurate version number, its
376 specification has moved from a line in the Makefile to a new
377 source file 'version'.
379 The experimental distribution contains a file to2050.tzs that
380 contains what should be the output of 'zdump -i -c 2050' on
381 primary zones. If this file is available, 'make check' now checks
382 that zdump generates this output.
384 'make check_web' now works on Fedora-like distributions.
386 Changes to documentation and commentary
388 tzfile.5 now documents the new restriction on POSIX TZ-like
389 strings that is now implemented by zic.
391 Comments now cite URLs for some 1917-1921 Russian DST decrees.
392 (Thanks to Alexander Belopolsky.)
394 tz-link.htm mentions JuliaTime (thanks to Curtis Vogt) and Time4J
395 (thanks to Meno Hochschild) and ThreeTen-Extra, and its
396 description of Java 8 has been brought up to date (thanks to
397 Stephen Colebourne). Its description of local time on Mars has
398 been updated to match current practice, and URLs have been updated
399 and some obsolete ones removed.
402 Release 2016f - 2016-07-05 16:26:51 +0200
404 Changes affecting future time stamps
406 The Egyptian government changed its mind on short notice, and
407 Africa/Cairo will not introduce DST starting 2016-07-07 after all.
408 (Thanks to Mina Samuel.)
410 Asia/Novosibirsk switches from +06 to +07 on 2016-07-24 at 02:00.
411 (Thanks to Stepan Golosunov.)
413 Changes to past and future time stamps
415 Asia/Novokuznetsk and Asia/Novosibirsk now use numeric time zone
416 abbreviations instead of invented ones.
418 Changes affecting past time stamps
420 Europe/Minsk's 1992-03-29 spring-forward transition was at 02:00 not 00:00.
421 (Thanks to Stepan Golosunov.)
424 Release 2016e - 2016-06-14 08:46:16 -0700
426 Changes affecting future time stamps
428 Africa/Cairo observes DST in 2016 from July 7 to the end of October.
429 Guess October 27 and 24:00 transitions. (Thanks to Steffen Thorsen.)
430 For future years, guess April's last Thursday to October's last
431 Thursday except for Ramadan.
433 Changes affecting past time stamps
435 Locations while uninhabited now use '-00', not 'zzz', as a
436 placeholder time zone abbreviation. This is inspired by Internet
437 RFC 3339 and is more consistent with numeric time zone
438 abbreviations already used elsewhere. The change affects several
439 arctic and antarctic locations, e.g., America/Cambridge_Bay before
440 1920 and Antarctica/Troll before 2005.
442 Asia/Baku's 1992-09-27 transition from +04 (DST) to +04 (non-DST) was
443 at 03:00, not 23:00 the previous day. (Thanks to Michael Deckers.)
447 zic now outputs a dummy transition at time 2**31 - 1 in zones
448 whose POSIX-style TZ strings contain a '<'. This mostly works
449 around Qt bug 53071 <https://bugreports.qt.io/browse/QTBUG-53071>.
450 (Thanks to Zhanibek Adilbekov for reporting the Qt bug.)
452 Changes affecting documentation and commentary
454 tz-link.htm says why governments should give plenty of notice for
455 time zone or DST changes, and refers to Matt Johnson's blog post.
457 tz-link.htm mentions Tzdata for Elixir. (Thanks to Matt Johnson.)
460 Release 2016d - 2016-04-17 22:50:29 -0700
462 Changes affecting future time stamps
464 America/Caracas switches from -0430 to -04 on 2016-05-01 at 02:30.
465 (Thanks to Alexander Krivenyshev for the heads-up.)
467 Asia/Magadan switches from +10 to +11 on 2016-04-24 at 02:00.
468 (Thanks to Alexander Krivenyshev and Matt Johnson.)
470 New zone Asia/Tomsk, split off from Asia/Novosibirsk. It covers
471 Tomsk Oblast, Russia, which switches from +06 to +07 on 2016-05-29
472 at 02:00. (Thanks to Stepan Golosunov.)
474 Changes affecting past time stamps
476 New zone Europe/Kirov, split off from Europe/Volgograd. It covers
477 Kirov Oblast, Russia, which switched from +04/+05 to +03/+04 on
478 1989-03-26 at 02:00, roughly a year after Europe/Volgograd made
479 the same change. (Thanks to Stepan Golosunov.)
481 Russia and nearby locations had daylight-saving transitions on
482 1992-03-29 at 02:00 and 1992-09-27 at 03:00, instead of on
483 1992-03-28 at 23:00 and 1992-09-26 at 23:00. (Thanks to Stepan
486 Many corrections to historical time in Kazakhstan from 1991
487 through 2005. (Thanks to Stepan Golosunov.) Replace Kazakhstan's
488 invented time zone abbreviations with numeric abbreviations.
490 Changes to commentary
492 Mention Internet RFCs 7808 (TZDIST) and 7809 (CalDAV time zone references).
495 Release 2016c - 2016-03-23 00:51:27 -0700
497 Changes affecting future time stamps
499 Azerbaijan no longer observes DST. (Thanks to Steffen Thorsen.)
501 Chile reverts from permanent to seasonal DST. (Thanks to Juan
502 Correa for the heads-up, and to Tim Parenti for corrections.)
503 Guess that future transitions are August's and May's second
504 Saturdays at 24:00 mainland time. Also, call the period from
505 2014-09-07 through 2016-05-14 daylight saving time instead of
506 standard time, as that seems more appropriate now.
508 Changes affecting past time stamps
510 Europe/Kaliningrad and Europe/Vilnius changed from +03/+04 to
511 +02/+03 on 1989-03-26, not 1991-03-31. Europe/Volgograd changed
512 from +04/+05 to +03/+04 on 1988-03-27, not 1989-03-26.
513 (Thanks to Stepan Golosunov.)
515 Changes to commentary
517 Several updates and URLs for historical and proposed Russian changes.
518 (Thanks to Stepan Golosunov, Matt Johnson, and Alexander Krivenyshev.)
521 Release 2016b - 2016-03-12 17:30:14 -0800
525 Starting with release 2016b, some data entries cause zic implementations
526 derived from tz releases 2005j through 2015e to issue warnings like
527 "time zone abbreviation differs from POSIX standard (+03)".
528 These warnings should not otherwise affect zic's output and can safely be
529 ignored on today's platforms, as the warnings refer to a restriction in
530 POSIX.1-1988 that was removed in POSIX.1-2001. One way to suppress the
531 warnings is to upgrade to zic derived from tz releases 2015f and later.
533 Changes affecting future time stamps
535 New zones Europe/Astrakhan and Europe/Ulyanovsk for Astrakhan and
536 Ulyanovsk Oblasts, Russia, both of which will switch from +03 to +04 on
537 2016-03-27 at 02:00 local time. They need distinct zones since their
538 post-1970 histories disagree. New zone Asia/Barnaul for Altai Krai and
539 Altai Republic, Russia, which will switch from +06 to +07 on the same date
540 and local time. The Astrakhan change is already official; the others have
541 passed the first reading in the State Duma and are extremely likely.
542 Also, Asia/Sakhalin moves from +10 to +11 on 2016-03-27 at 02:00.
543 (Thanks to Alexander Krivenyshev for the heads-up, and to Matt Johnson
544 and Stepan Golosunov for followup.)
546 As a trial of a new system that needs less information to be made up,
547 the new zones use numeric time zone abbreviations like "+04"
548 instead of invented abbreviations like "ASTT".
550 Haiti will not observe DST in 2016. (Thanks to Jean Antoine via
553 Palestine's spring-forward transition on 2016-03-26 is at 01:00, not 00:00.
554 (Thanks to Hannah Kreitem.) Guess future transitions will be March's last
555 Saturday at 01:00, not March's last Friday at 24:00.
557 Changes affecting past time stamps
559 Europe/Chisinau observed DST during 1990, and switched from +04 to
560 +03 at 1990-05-06 02:00, instead of switching from +03 to +02.
561 (Thanks to Stepan Golosunov.)
563 1991 abbreviations in Europe/Samara should be SAMT/SAMST, not
564 KUYT/KUYST. (Thanks to Stepan Golosunov.)
568 tzselect's diagnostics and checking, and checktab.awk's checking,
569 have been improved. (Thanks to J William Piggott.)
571 tzcode now builds under MinGW. (Thanks to Ian Abbott and Esben Haabendal.)
573 tzselect now tests Julian-date TZ settings more accurately.
574 (Thanks to J William Piggott.)
576 Changes to commentary
578 Comments in zone tables have been improved. (Thanks to J William Piggott.)
580 tzselect again limits its menu comments so that menus fit on a
581 24x80 alphanumeric display.
583 A new web page tz-how-to.html. (Thanks to Bill Seymour.)
585 In the Theory file, the description of possible time zone abbreviations in
586 tzdata has been cleaned up, as the old description was unclear and
587 inconsistent. (Thanks to Alain Mouette for reporting the problem.)
590 Release 2016a - 2016-01-26 23:28:02 -0800
592 Changes affecting future time stamps
594 America/Cayman will not observe daylight saving this year after all.
595 Revert our guess that it would. (Thanks to Matt Johnson.)
597 Asia/Chita switches from +0800 to +0900 on 2016-03-27 at 02:00.
598 (Thanks to Alexander Krivenyshev.)
600 Asia/Tehran now has DST predictions for the year 2038 and later,
601 to be March 21 00:00 to September 21 00:00. This is likely better
602 than predicting no DST, albeit off by a day every now and then.
604 Changes affecting past and future time stamps
606 America/Metlakatla switched from PST all year to AKST/AKDT on
607 2015-11-01 at 02:00. (Thanks to Steffen Thorsen.)
609 America/Santa_Isabel has been removed, and replaced with a
610 backward compatibility link to America/Tijuana. Its contents were
611 apparently based on a misreading of Mexican legislation.
613 Changes affecting past time stamps
615 Asia/Karachi's two transition times in 2002 were off by a minute.
616 (Thanks to Matt Johnson.)
618 Changes affecting build procedure
620 An installer can now combine leap seconds with use of the backzone file,
621 e.g., with 'make PACKRATDATA=backzone REDO=posix_right zones'.
622 The old 'make posix_packrat' rule is now marked as obsolescent.
623 (Thanks to Ian Abbott for an initial implementation.)
625 Changes affecting documentation and commentary
627 A new file LICENSE makes it easier to see that the code and data
628 are mostly public-domain. (Thanks to James Knight.) The three
629 non-public-domain files now use the current (3-clause) BSD license
630 instead of older versions of that license.
632 tz-link.htm mentions the BDE library (thanks to Andrew Paprocki),
633 CCTZ (thanks to Tim Parenti), TimeJones.com, and has a new section
634 on editing tz source files (with a mention of Sublime zoneinfo,
635 thanks to Gilmore Davidson).
637 The Theory and asia files now mention the 2015 book "The Global
638 Transformation of Time, 1870-1950", and cite a couple of reviews.
640 The America/Chicago entry now documents the informal use of US
641 central time in Fort Pierre, South Dakota. (Thanks to Rick
642 McDermid, Matt Johnson, and Steve Jones.)
645 Release 2015g - 2015-10-01 00:39:51 -0700
647 Changes affecting future time stamps
649 Turkey's 2015 fall-back transition is scheduled for Nov. 8, not Oct. 25.
652 Norfolk moves from +1130 to +1100 on 2015-10-04 at 02:00 local time.
653 (Thanks to Alexander Krivenyshev.)
655 Fiji's 2016 fall-back transition is scheduled for January 17, not 24.
656 (Thanks to Ken Rylander.)
658 Fort Nelson, British Columbia will not fall back on 2015-11-01. It has
659 effectively been on MST (-0700) since it advanced its clocks on 2015-03-08.
660 New zone America/Fort_Nelson. (Thanks to Matt Johnson.)
662 Changes affecting past time stamps
664 Norfolk observed DST from 1974-10-27 02:00 to 1975-03-02 02:00.
666 Changes affecting code
668 localtime no longer mishandles America/Anchorage after 2037.
669 (Thanks to Bradley White for reporting the bug.)
671 On hosts with signed 32-bit time_t, localtime no longer mishandles
672 Pacific/Fiji after 2038-01-16 14:00 UTC.
674 The localtime module allows the variables 'timezone', 'daylight',
675 and 'altzone' to be in common storage shared with other modules,
676 and declares them in case the system <time.h> does not.
677 (Problems reported by Kees Dekker.)
679 On platforms with tm_zone, strftime.c now assumes it is not NULL.
680 This simplifies the code and is consistent with zdump.c.
681 (Problem reported by Christos Zoulas.)
683 Changes affecting documentation
685 The tzfile man page now documents that transition times denote the
686 starts (not the ends) of the corresponding time periods.
687 (Ambiguity reported by Bill Seymour.)
690 Release 2015f - 2015-08-10 18:06:56 -0700
692 Changes affecting future time stamps
694 North Korea switches to +0830 on 2015-08-15. (Thanks to Steffen Thorsen.)
695 The abbreviation remains "KST". (Thanks to Robert Elz.)
697 Uruguay no longer observes DST. (Thanks to Steffen Thorsen
700 Changes affecting past and future time stamps
702 Moldova starts and ends DST at 00:00 UTC, not at 01:00 UTC.
703 (Thanks to Roman Tudos.)
705 Changes affecting data format and code
707 zic's '-y YEARISTYPE' option is no longer documented. The TYPE
708 field of a Rule line should now be '-'; the old values 'even',
709 'odd', 'uspres', 'nonpres', 'nonuspres' were already undocumented.
710 Although the implementation has not changed, these features do not
711 work in the default installation, they are not used in the data,
712 and they are now considered obsolescent.
714 zic now checks that two rules don't take effect at the same time.
715 (Thanks to Jon Skeet and Arthur David Olson.) Constraints on
716 simultaneity are now documented.
718 The two characters '%z' in a zone format now stand for the UTC
719 offset, e.g., '-07' for seven hours behind UTC and '+0530' for
720 five hours and thirty minutes ahead. This better supports time
721 zone abbreviations conforming to POSIX.1-2001 and later.
723 Changes affecting installed data files
725 Comments for America/Halifax and America/Glace_Bay have been improved.
726 (Thanks to Brian Inglis.)
728 Data entries have been simplified for Atlantic/Canary, Europe/Simferopol,
729 Europe/Sofia, and Europe/Tallinn. This yields slightly smaller
730 installed data files for Europe/Simferopol and Europe/Tallinn.
731 It does not affect timestamps. (Thanks to Howard Hinnant.)
733 Changes affecting code
735 zdump and zic no longer warn about valid time zone abbreviations
738 Some Visual Studio 2013 warnings have been suppressed.
739 (Thanks to Kees Dekker.)
741 'date' no longer sets the time of day and its -a, -d, -n and -t
742 options have been removed. Long obsolescent, the implementation
743 of these features had porting problems. Builders no longer need
744 to configure HAVE_ADJTIME, HAVE_SETTIMEOFDAY, or HAVE_UTMPX_H.
745 (Thanks to Kees Dekker for pointing out the problem.)
747 Changes affecting documentation
749 The Theory file mentions naming issues earlier, as these seem to be
750 poorly publicized (thanks to Gilmore Davidson for reporting the problem).
752 tz-link.htm mentions Time Zone Database Parser (thanks to Howard Hinnant).
754 Mention that Herbert Samuel introduced the term "Summer Time".
757 Release 2015e - 2015-06-13 10:56:02 -0700
759 Changes affecting future time stamps
761 Morocco will suspend DST from 2015-06-14 03:00 through 2015-07-19 02:00,
762 not 06-13 and 07-18 as we had guessed. (Thanks to Milamber.)
764 Assume Cayman Islands will observe DST starting next year, using US rules.
765 Although it isn't guaranteed, it is the most likely.
767 Changes affecting data format
769 The file 'iso3166.tab' now uses UTF-8, so that its entries can better
770 spell the names of Åland Islands, Côte d'Ivoire, and Réunion.
772 Changes affecting code
774 When displaying data, tzselect converts it to the current locale's
775 encoding if the iconv command works. (Problem reported by random832.)
777 tzselect no longer mishandles Dominica, fixing a bug introduced
778 in Release 2014f. (Problem reported by Owen Leibman.)
780 zic -l no longer fails when compiled with -DTZDEFAULT=\"/etc/localtime\".
781 This fixes a bug introduced in Release 2014f.
782 (Problem reported by Leonardo Chiquitto.)
785 Release 2015d - 2015-04-24 08:09:46 -0700
787 Changes affecting future time stamps
789 Egypt will not observe DST in 2015 and will consider canceling it
790 permanently. For now, assume no DST indefinitely.
791 (Thanks to Ahmed Nazmy and Tim Parenti.)
793 Changes affecting past time stamps
795 America/Whitehorse switched from UT -09 to -08 on 1967-05-28, not
796 1966-07-01. Also, Yukon's time zone history is documented better.
797 (Thanks to Brian Inglis and Dennis Ferguson.)
799 Change affecting past and future time zone abbreviations
801 The abbreviations for Hawaii-Aleutian standard and daylight times
802 have been changed from HAST/HADT to HST/HDT, as per US Government
803 Printing Office style. This affects only America/Adak since 1983,
804 as America/Honolulu was already using the new style.
806 Changes affecting code
808 zic has some minor performance improvements.
811 Release 2015c - 2015-04-11 08:55:55 -0700
813 Changes affecting future time stamps
815 Egypt's spring-forward transition is at 24:00 on April's last Thursday,
816 not 00:00 on April's last Friday. 2015's transition will therefore be on
817 Thursday, April 30 at 24:00, not Friday, April 24 at 00:00. Similar fixes
818 apply to 2026, 2037, 2043, etc. (Thanks to Steffen Thorsen.)
820 Changes affecting past time stamps
822 The following changes affect some pre-1991 Chile-related time stamps
823 in America/Santiago, Antarctica/Palmer, and Pacific/Easter.
825 The 1910 transition was January 10, not January 1.
827 The 1918 transition was September 10, not September 1.
829 The UT -04 time observed from 1932 to 1942 is now considered to
830 be standard time, not year-round DST.
832 Santiago observed DST (UT -03) from 1946-07-15 through
833 1946-08-31, then reverted to standard time, then switched to -05
836 Assume transitions before 1968 were at 00:00, since we have no data
839 The spring 1988 transition was 1988-10-09, not 1988-10-02.
840 The fall 1990 transition was 1990-03-11, not 1990-03-18.
842 Assume no UTC offset change for Pacific/Easter on 1890-01-01,
843 and omit all transitions on Pacific/Easter from 1942 through 1946
844 since we have no data suggesting that they existed.
846 One more zone has been turned into a link, as it differed
847 from an existing zone only for older time stamps. As usual,
848 this change affects UTC offsets in pre-1970 time stamps only.
849 The zone's old contents have been moved to the 'backzone' file.
850 The affected zone is America/Montreal.
852 Changes affecting commentary
854 Mention the TZUpdater tool.
856 Mention "The Time Now". (Thanks to Brandon Ramsey.)
859 Release 2015b - 2015-03-19 23:28:11 -0700
861 Changes affecting future time stamps
863 Mongolia will start observing DST again this year, from the last
864 Saturday in March at 02:00 to the last Saturday in September at 00:00.
865 (Thanks to Ganbold Tsagaankhuu.)
867 Palestine will start DST on March 28, not March 27. Also,
868 correct the fall 2014 transition from September 26 to October 24.
869 Adjust future predictions accordingly. (Thanks to Steffen Thorsen.)
871 Changes affecting past time stamps
873 The 1982 zone shift in Pacific/Easter has been corrected, fixing a 2015a
874 regression. (Thanks to Stuart Bishop for reporting the problem.)
876 Some more zones have been turned into links, when they differed
877 from existing zones only for older time stamps. As usual,
878 these changes affect UTC offsets in pre-1970 time stamps only.
879 Their old contents have been moved to the 'backzone' file.
880 The affected zones are: America/Antigua, America/Cayman,
881 Pacific/Midway, and Pacific/Saipan.
883 Changes affecting time zone abbreviations
885 Correct the 1992-2010 DST abbreviation in Volgograd from "MSK" to "MSD".
888 Changes affecting code
890 Fix integer overflow bug in reference 'mktime' implementation.
891 (Problem reported by Jörg Richter.)
893 Allow -Dtime_tz=time_t compilations, and allow -Dtime_tz=... libraries
894 to be used in the same executable as standard-library time_t functions.
895 (Problems reported by Bradley White.)
897 Changes affecting commentary
899 Cite the recent Mexican decree changing Quintana Roo's time zone.
900 (Thanks to Carlos Raúl Perasso.)
902 Likewise for the recent Chilean decree. (Thanks to Eduardo Romero Urra.)
904 Update info about Mars time.
907 Release 2015a - 2015-01-29 22:35:20 -0800
909 Changes affecting future time stamps
911 The Mexican state of Quintana Roo, represented by America/Cancun,
912 will shift from Central Time with DST to Eastern Time without DST
913 on 2015-02-01 at 02:00. (Thanks to Steffen Thorsen and Gwillim Law.)
915 Chile will not change clocks in April or thereafter; its new standard time
916 will be its old daylight saving time. This affects America/Santiago,
917 Pacific/Easter, and Antarctica/Palmer. (Thanks to Juan Correa.)
919 New leap second 2015-06-30 23:59:60 UTC as per IERS Bulletin C 49.
920 (Thanks to Tim Parenti.)
922 Changes affecting past time stamps
924 Iceland observed DST in 1919 and 1921, and its 1939 fallback
925 transition was Oct. 29, not Nov. 29. Remove incorrect data from
926 Shanks about time in Iceland between 1837 and 1908.
928 Some more zones have been turned into links, when they differed
929 from existing zones only for older time stamps. As usual,
930 these changes affect UTC offsets in pre-1970 time stamps only.
931 Their old contents have been moved to the 'backzone' file.
932 The affected zones are: Asia/Aden, Asia/Bahrain, Asia/Kuwait,
935 Changes affecting code
937 tzalloc now scrubs time zone abbreviations compatibly with the way
938 that tzset always has, by replacing invalid bytes with '_' and by
939 shortening too-long abbreviations.
941 tzselect ports to POSIX awk implementations, no longer mishandles
942 POSIX TZ settings when GNU awk is used, and reports POSIX TZ
943 settings to the user. (Thanks to Stefan Kuhn.)
945 Changes affecting build procedure
947 'make check' now checks for links to links in the data.
948 One such link (for Africa/Asmera) has been fixed.
949 (Thanks to Stephen Colebourne for pointing out the problem.)
951 Changes affecting commentary
953 The leapseconds file commentary now mentions the expiration date.
954 (Problem reported by Martin Burnicki.)
956 Update Mexican Library of Congress URL.
959 Release 2014j - 2014-11-10 17:37:11 -0800
961 Changes affecting current and future time stamps
963 Turks & Caicos' switch from US eastern time to UT -04 year-round
964 did not occur on 2014-11-02 at 02:00. It's currently scheduled
965 for 2015-11-01 at 02:00. (Thanks to Chris Walton.)
967 Changes affecting past time stamps
969 Many pre-1989 time stamps have been corrected for Asia/Seoul and
970 Asia/Pyongyang, based on sources for the Korean-language Wikipedia
971 entry for time in Korea. (Thanks to Sanghyuk Jung.) Also, no
972 longer guess that Pyongyang mimicked Seoul time after World War II,
973 as this is politically implausible.
975 Some more zones have been turned into links, when they differed
976 from existing zones only for older time stamps. As usual,
977 these changes affect UTC offsets in pre-1970 time stamps only.
978 Their old contents have been moved to the 'backzone' file.
979 The affected zones are: Africa/Addis_Ababa, Africa/Asmara,
980 Africa/Dar_es_Salaam, Africa/Djibouti, Africa/Kampala,
981 Africa/Mogadishu, Indian/Antananarivo, Indian/Comoro, and
984 Changes affecting commentary
986 The commentary is less enthusiastic about Shanks as a source,
987 and is more careful to distinguish UT from UTC.
990 Release 2014i - 2014-10-21 22:04:57 -0700
992 Changes affecting future time stamps
994 Pacific/Fiji will observe DST from 2014-11-02 02:00 to 2015-01-18 03:00.
995 (Thanks to Ken Rylander for the heads-up.) Guess that future
996 years will use a similar pattern.
998 A new Zone Pacific/Bougainville, for the part of Papua New Guinea
999 that plans to switch from UT +10 to +11 on 2014-12-28 at 02:00.
1000 (Thanks to Kiley Walbom for the heads-up.)
1002 Changes affecting time zone abbreviations
1004 Since Belarus is not changing its clocks even though Moscow is,
1005 the time zone abbreviation in Europe/Minsk is changing from FET
1006 to its more-traditional value MSK on 2014-10-26 at 01:00.
1007 (Thanks to Alexander Bokovoy for the heads-up about Belarus.)
1009 The new abbreviation IDT stands for the pre-1976 use of UT +08 in
1010 Indochina, to distinguish it better from ICT (+07).
1012 Changes affecting past time stamps
1014 Many time stamps have been corrected for Asia/Ho_Chi_Minh before 1976
1015 (thanks to Trần Ngọc Quân for an indirect pointer to Trần Tiến Bình's
1016 authoritative book). Asia/Ho_Chi_Minh has been added to
1017 zone1970.tab, to give tzselect users in Vietnam two choices,
1018 since north and south Vietnam disagreed after our 1970 cutoff.
1020 Asia/Phnom_Penh and Asia/Vientiane have been turned into links, as
1021 they differed from existing zones only for older time stamps. As
1022 usual, these changes affect pre-1970 time stamps only. Their old
1023 contents have been moved to the 'backzone' file.
1025 Changes affecting code
1027 The time-related library functions now set errno on failure, and
1028 some crashes in the new tzalloc-related library functions have
1029 been fixed. (Thanks to Christos Zoulas for reporting most of
1030 these problems and for suggesting fixes.)
1032 If USG_COMPAT is defined and the requested timestamp is standard time,
1033 the tz library's localtime and mktime functions now set the extern
1034 variable timezone to a value appropriate for that timestamp; and
1035 similarly for ALTZONE, daylight saving time, and the altzone variable.
1036 This change is a companion to the tzname change in 2014h, and is
1037 designed to make timezone and altzone more compatible with tzname.
1039 The tz library's functions now set errno to EOVERFLOW if they fail
1040 because the result cannot be represented. ctime and ctime_r now
1041 return NULL and set errno when a timestamp is out of range, rather
1042 than having undefined behavior.
1044 Some bugs associated with the new 2014g functions have been fixed.
1045 This includes a bug that largely incapacitated the new functions
1046 time2posix_z and posix2time_z. (Thanks to Christos Zoulas.)
1047 It also includes some uses of uninitialized variables after tzalloc.
1048 The new code uses the standard type 'ssize_t', which the Makefile
1049 now gives porting advice about.
1051 Changes affecting commentary
1053 Updated URLs for NRC Canada (thanks to Matt Johnson and Brian Inglis).
1056 Release 2014h - 2014-09-25 18:59:03 -0700
1058 Changes affecting past timestamps
1060 America/Jamaica's 1974 spring-forward transition was Jan. 6, not Apr. 28.
1062 Shanks says Asia/Novokuznetsk switched from LMT (not "NMT") on 1924-05-01,
1063 not 1920-01-06. The old entry was based on a misinterpretation of Shanks.
1065 Some more zones have been turned into links, when they differed
1066 from existing zones only for older timestamps. As usual,
1067 these changes affect UTC offsets in pre-1970 timestamps only.
1068 Their old contents have been moved to the 'backzone' file.
1069 The affected zones are: Africa/Blantyre, Africa/Bujumbura,
1070 Africa/Gaborone, Africa/Harare, Africa/Kigali, Africa/Lubumbashi,
1071 Africa/Lusaka, Africa/Maseru, and Africa/Mbabane.
1073 Changes affecting code
1075 zdump -V and -v now output gmtoff= values on all platforms,
1076 not merely on platforms defining TM_GMTOFF.
1078 The tz library's localtime and mktime functions now set tzname to a value
1079 appropriate for the requested timestamp, and zdump now uses this
1080 on platforms not defining TM_ZONE, fixing a 2014g regression.
1081 (Thanks to Tim Parenti for reporting the problem.)
1083 The tz library no longer sets tzname if localtime or mktime fails.
1085 zdump -c no longer mishandles transitions near year boundaries.
1086 (Thanks to Tim Parenti for reporting the problem.)
1088 An access to uninitialized data has been fixed.
1089 (Thanks to Jörg Richter for reporting the problem.)
1091 When THREAD_SAFE is defined, the code ports to the C11 memory model.
1092 A memory leak has been fixed if ALL_STATE and THREAD_SAFE are defined
1093 and two threads race to initialize data used by gmtime-like functions.
1094 (Thanks to Andy Heninger for reporting the problems.)
1096 Changes affecting build procedure
1098 'make check' now checks better for properly-sorted data.
1100 Changes affecting documentation and commentary
1102 zdump's gmtoff=N output is now documented, and its isdst=D output
1103 is now documented to possibly output D values other than 0 or 1.
1105 zdump -c's treatment of years is now documented to use the
1106 Gregorian calendar and Universal Time without leap seconds,
1107 and its behavior at cutoff boundaries is now documented better.
1108 (Thanks to Arthur David Olson and Tim Parenti for reporting the problems.)
1110 Programs are now documented to use the proleptic Gregorian calendar.
1111 (Thanks to Alan Barrett for the suggestion.)
1113 Fractional-second GMT offsets have been documented for civil time
1114 in 19th-century Chennai, Jakarta, and New York.
1117 Release 2014g - 2014-08-28 12:31:23 -0700
1119 Changes affecting future timestamps
1121 Turks & Caicos is switching from US eastern time to UT -04
1122 year-round, modeled as a switch on 2014-11-02 at 02:00.
1123 [As noted in 2014j, this switch was later delayed.]
1125 Changes affecting past timestamps
1127 Time in Russia or the USSR before 1926 or so has been corrected by
1128 a few seconds in the following zones: Asia/Irkutsk,
1129 Asia/Krasnoyarsk, Asia/Omsk, Asia/Samarkand, Asia/Tbilisi,
1130 Asia/Vladivostok, Asia/Yakutsk, Europe/Riga, Europe/Samara. For
1131 Asia/Yekaterinburg the correction is a few minutes. (Thanks to
1132 Vladimir Karpinsky.)
1134 The Portuguese decree of 1911-05-26 took effect on 1912-01-01.
1135 This affects 1911 timestamps in Africa/Bissau, Africa/Luanda,
1136 Atlantic/Azores, and Atlantic/Madeira. Also, Lisbon's pre-1912
1137 GMT offset was -0:36:45 (rounded from -0:36:44.68), not -0:36:32.
1138 (Thanks to Stephen Colebourne for pointing to the decree.)
1140 Asia/Dhaka ended DST on 2009-12-31 at 24:00, not 23:59.
1142 A new file 'backzone' contains data which may appeal to
1143 connoisseurs of old timestamps, although it is out of scope for
1144 the tz database, is often poorly sourced, and contains some data
1145 that is known to be incorrect. The new file is not recommended
1146 for ordinary use and its entries are not installed by default.
1147 (Thanks to Lester Caine for the high-quality Jersey, Guernsey, and
1148 Isle of Man entries.)
1150 Some more zones have been turned into links, when they differed
1151 from existing zones only for older timestamps. As usual,
1152 these changes affect UTC offsets in pre-1970 timestamps only.
1153 Their old contents have been moved to the 'backzone' file.
1154 The affected zones are: Africa/Bangui, Africa/Brazzaville,
1155 Africa/Douala, Africa/Kinshasa, Africa/Libreville, Africa/Luanda,
1156 Africa/Malabo, Africa/Niamey, and Africa/Porto-Novo.
1158 Changes affecting code
1160 Unless NETBSD_INSPIRED is defined to 0, the tz library now
1161 supplies functions for creating and using objects that represent
1162 time zones. The new functions are tzalloc, tzfree, localtime_rz,
1163 mktime_z, and (if STD_INSPIRED is also defined) posix2time_z and
1164 time2posix_z. They are intended for performance: for example,
1165 localtime_rz (unlike localtime_r) is trivially thread-safe without
1166 locking. (Thanks to Christos Zoulas for proposing NetBSD-inspired
1167 functions, and to Alan Barrett and Jonathan Lennox for helping to
1170 zdump now builds with the tz library unless USE_LTZ is defined to 0,
1171 This lets zdump use tz features even if the system library lacks them.
1172 To build zdump with the system library, use 'make CFLAGS=-DUSE_LTZ=0
1173 TZDOBJS=zdump.o CHECK_TIME_T_ALTERNATIVES='.
1175 zdump now uses localtime_rz if available, as it's significantly faster,
1176 and it can help zdump better diagnose invalid time zone names.
1177 Define HAVE_LOCALTIME_RZ to 0 to suppress this. HAVE_LOCALTIME_RZ
1178 defaults to 1 if NETBSD_INSPIRED && USE_LTZ. When localtime_rz is
1179 not available, zdump now uses localtime_r and tzset if available,
1180 as this is a bit cleaner and faster than plain localtime. Compile
1181 with -DHAVE_LOCALTIME_R=0 and/or -DHAVE_TZSET=0 if your system
1182 lacks these two functions.
1184 If THREAD_SAFE is defined to 1, the tz library is now thread-safe.
1185 Although not needed for tz's own applications, which are single-threaded,
1186 this supports POSIX better if the tz library is used in multithreaded apps.
1188 Some crashes have been fixed when zdump or the tz library is given
1189 invalid or outlandish input.
1191 The tz library no longer mishandles leap seconds on platforms with
1192 unsigned time_t in time zones that lack ordinary transitions after 1970.
1194 The tz code now attempts to infer TM_GMTOFF and TM_ZONE if not
1195 already defined, to make it easier to configure on common platforms.
1196 Define NO_TM_GMTOFF and NO_TM_ZONE to suppress this.
1198 Unless the new macro UNINIT_TRAP is defined to 1, the tz code now
1199 assumes that reading uninitialized memory yields garbage values
1200 but does not cause other problems such as traps.
1202 If TM_GMTOFF is defined and UNINIT_TRAP is 0, mktime is now
1203 more likely to guess right for ambiguous timestamps near
1204 transitions where tm_isdst does not change.
1206 If HAVE_STRFTIME_L is defined to 1, the tz library now defines
1207 strftime_l for compatibility with recent versions of POSIX.
1208 Only the C locale is supported, though. HAVE_STRFTIME_L defaults
1209 to 1 on recent POSIX versions, and to 0 otherwise.
1211 tzselect -c now uses a hybrid distance measure that works better
1212 in Africa. (Thanks to Alan Barrett for noting the problem.)
1214 The C source code now ports to NetBSD when GCC_DEBUG_FLAGS is used,
1215 or when time_tz is defined.
1217 When HAVE_UTMPX_H is set the 'date' command now builds on systems
1218 whose <utmpx.h> file does not define WTMPX_FILE, and when setting
1219 the date it updates the wtmpx file if _PATH_WTMPX is defined.
1220 This affects GNU/Linux and similar systems.
1222 For easier maintenance later, some C code has been simplified,
1223 some lint has been removed, and the code has been tweaked so that
1224 plain 'make' is more likely to work.
1226 The C type 'bool' is now used for boolean values, instead of 'int'.
1228 The long-obsolete LOCALE_HOME code has been removed.
1230 The long-obsolete 'gtime' function has been removed.
1232 Changes affecting build procedure
1234 'zdump' no longer links in ialloc.o, as it's not needed.
1236 'make check_time_t_alternatives' no longer assumes GNU diff.
1238 Changes affecting distribution tarballs
1240 The files checktab.awk and zoneinfo2tdf.pl are now distributed in
1241 the tzdata tarball instead of the tzcode tarball, since they help
1242 maintain the data. The NEWS and Theory files are now also
1243 distributed in the tzdata tarball, as they're relevant for data.
1244 (Thanks to Alan Barrett for pointing this out.) Also, the
1245 leapseconds.awk file is no longer distributed in the tzcode
1246 tarball, since it belongs in the tzdata tarball (where 2014f
1247 inadvertently also distributed it).
1249 Changes affecting documentation and commentary
1251 A new file CONTRIBUTING is distributed. (Thanks to Tim Parenti for
1252 suggesting a CONTRIBUTING file, and to Tony Finch and Walter Harms
1255 The man pages have been updated to use function prototypes,
1256 to document thread-safe variants like localtime_r, and to document
1257 the NetBSD-inspired functions tzalloc, tzfree, localtime_rz, and
1260 The fields in Link lines have been renamed to be more descriptive
1261 and more like the parameters of 'ln'. LINK-FROM has become TARGET,
1262 and LINK-TO has become LINK-NAME.
1264 tz-link.htm mentions the IETF's tzdist working group; Windows
1265 Runtime etc. (thanks to Matt Johnson); and HP-UX's tztab.
1267 Some broken URLs have been fixed in the commentary. (Thanks to
1270 Commentary about Philippines DST has been updated, and commentary
1271 on pre-1970 time in India has been added.
1274 Release 2014f - 2014-08-05 17:42:36 -0700
1276 Changes affecting future timestamps
1278 Russia will subtract an hour from most of its time zones on 2014-10-26
1279 at 02:00 local time. (Thanks to Alexander Krivenyshev.)
1280 There are a few exceptions: Magadan Oblast (Asia/Magadan) and Zabaykalsky
1281 Krai are subtracting two hours; conversely, Chukotka Autonomous Okrug
1282 (Asia/Anadyr), Kamchatka Krai (Asia/Kamchatka), Kemerovo Oblast
1283 (Asia/Novokuznetsk), and the Samara Oblast and the Udmurt Republic
1284 (Europe/Samara) are not changing their clocks. The changed zones are
1285 Europe/Kaliningrad, Europe/Moscow, Europe/Simferopol, Europe/Volgograd,
1286 Asia/Yekaterinburg, Asia/Omsk, Asia/Novosibirsk, Asia/Krasnoyarsk,
1287 Asia/Irkutsk, Asia/Yakutsk, Asia/Vladivostok, Asia/Khandyga,
1288 Asia/Sakhalin, and Asia/Ust-Nera; Asia/Magadan will have two hours
1289 subtracted; and Asia/Novokuznetsk's time zone abbreviation is affected,
1290 but not its UTC offset. Two zones are added: Asia/Chita (split
1291 from Asia/Yakutsk, and also with two hours subtracted) and
1292 Asia/Srednekolymsk (split from Asia/Magadan, but with only one hour
1293 subtracted). (Thanks to Tim Parenti for much of the above.)
1295 Changes affecting time zone abbreviations
1297 Australian eastern time zone abbreviations are now AEST/AEDT not EST,
1298 and similarly for the other Australian zones. That is, for eastern
1299 standard and daylight saving time the abbreviations are AEST and AEDT
1300 instead of the former EST for both; similarly, ACST/ACDT, ACWST/ACWDT,
1301 and AWST/AWDT are now used instead of the former CST, CWST, and WST.
1302 This change does not affect UTC offsets, only time zone abbreviations.
1303 (Thanks to Rich Tibbett and many others.)
1305 Asia/Novokuznetsk shifts from NOVT to KRAT (remaining on UT +07)
1306 effective 2014-10-26 at 02:00 local time.
1308 The time zone abbreviation for Xinjiang Time (observed in Ürümqi)
1309 has been changed from URUT to XJT. (Thanks to Luther Ma.)
1311 Prefer MSK/MSD for Moscow time in Russia, even in other cities.
1312 Similarly, prefer EET/EEST for eastern European time in Russia.
1314 Change time zone abbreviations in (western) Samoa to use "ST" and
1315 "DT" suffixes, as this is more likely to match common practice.
1316 Prefix "W" to (western) Samoa time when its standard-time offset
1317 disagrees with that of American Samoa.
1319 America/Metlakatla now uses PST, not MeST, to abbreviate its time zone.
1321 Time zone abbreviations have been updated for Japan's two time
1322 zones used 1896-1937. JWST now stands for Western Standard
1323 Time, and JCST for Central Standard Time (formerly this was CJT).
1324 These abbreviations are now used for time in Korea, Taiwan,
1325 and Sakhalin while controlled by Japan.
1327 Changes affecting past timestamps
1329 China's five zones have been simplified to two, since the post-1970
1330 differences in the other three seem to have been imaginary. The
1331 zones Asia/Harbin, Asia/Chongqing, and Asia/Kashgar have been
1332 removed; backwards-compatibility links still work, albeit with
1333 different behaviors for timestamps before May 1980. Asia/Urumqi's
1334 1980 transition to UT +08 has been removed, so that it is now at
1335 +06 and not +08. (Thanks to Luther Ma and to Alois Treindl;
1336 Treindl sent helpful translations of two papers by Guo Qingsheng.)
1338 Some zones have been turned into links, when they differed from existing
1339 zones only for older UTC offsets where data entries were likely invented.
1340 These changes affect UTC offsets in pre-1970 timestamps only. This is
1341 similar to the change in release 2013e, except this time for western
1342 Africa. The affected zones are: Africa/Bamako, Africa/Banjul,
1343 Africa/Conakry, Africa/Dakar, Africa/Freetown, Africa/Lome,
1344 Africa/Nouakchott, Africa/Ouagadougou, Africa/Sao_Tome, and
1345 Atlantic/St_Helena. This also affects the backwards-compatibility
1346 link Africa/Timbuktu. (Thanks to Alan Barrett, Stephen Colebourne,
1347 Tim Parenti, and David Patte for reporting problems in earlier
1348 versions of this change.)
1350 Asia/Shanghai's pre-standard-time UT offset has been changed from
1351 8:05:57 to 8:05:43, the location of Xujiahui Observatory. Its
1352 transition to standard time has been changed from 1928 to 1901.
1354 Asia/Taipei switched to JWST on 1896-01-01, then to JST on 1937-10-01,
1355 then to CST on 1945-09-21 at 01:00, and did not observe DST in 1945.
1356 In 1946 it observed DST from 05-15 through 09-30; in 1947
1357 from 04-15 through 10-31; and in 1979 from 07-01 through 09-30.
1358 (Thanks to Yu-Cheng Chuang.)
1360 Asia/Riyadh's transition to standard time is now 1947-03-14, not 1950.
1362 Europe/Helsinki's 1942 fall-back transition was 10-04 at 01:00, not
1363 10-03 at 00:00. (Thanks to Konstantin Hyppönen.)
1365 Pacific/Pago_Pago has been changed from UT -11:30 to -11 for the
1366 period from 1911 to 1950.
1368 Pacific/Chatham has been changed to New Zealand standard time plus
1369 45 minutes for the period before 1957, reflecting a 1956 remark in
1370 the New Zealand parliament.
1372 Europe/Budapest has several pre-1946 corrections: in 1918 the transition
1373 out of DST was on 09-16, not 09-29; in 1919 it was on 11-24, not 09-15; in
1374 1945 it was on 11-01, not 11-03; in 1941 the transition to DST was 04-08
1375 not 04-06 at 02:00; and there was no DST in 1920.
1377 Africa/Accra is now assumed to have observed DST from 1920 through 1935.
1379 Time in Russia before 1927 or so has been corrected by a few seconds in
1380 the following zones: Europe/Moscow, Asia/Irkutsk, Asia/Tbilisi,
1381 Asia/Tashkent, Asia/Vladivostok, Asia/Yekaterinburg, Europe/Helsinki, and
1382 Europe/Riga. Also, Moscow's location has been changed to its Kilometer 0
1383 point. (Thanks to Vladimir Karpinsky for the Moscow changes.)
1385 Changes affecting data format
1387 A new file 'zone1970.tab' supersedes 'zone.tab' in the installed data.
1388 The new file's extended format allows multiple country codes per zone.
1389 The older file is still installed but is deprecated; its format is
1390 not changing and it will still be distributed for a while, but new
1391 applications should use the new file.
1393 The new file format simplifies maintenance of obscure locations.
1394 To test this, it adds coverage for the Crozet Islands and the
1395 Scattered Islands. (Thanks to Tobias Conradi and Antoine Leca.)
1397 The file 'iso3166.tab' is planned to switch from ASCII to UTF-8.
1398 It is still ASCII now, but commentary about the switch has been added.
1399 The new file 'zone1970.tab' already uses UTF-8.
1401 Changes affecting code
1403 'localtime', 'mktime', etc. now use much less stack space if ALL_STATE
1404 is defined. (Thanks to Elliott Hughes for reporting the problem.)
1406 'zic' no longer mishandles input when ignoring case in locales that
1407 are not compatible with English, e.g., unibyte Turkish locales when
1408 compiled with HAVE_GETTEXT.
1410 Error diagnostics of 'zic' and 'yearistype' have been reworded so that
1411 they no longer use ASCII '-' as if it were a dash.
1413 'zic' now rejects output file names that contain '.' or '..' components.
1414 (Thanks to Tim Parenti for reporting the problem.)
1416 'zic -v' now warns about output file names that do not follow
1417 POSIX rules, or that contain a digit or '.'. (Thanks to Arthur
1418 David Olson for starting the ball rolling on this.)
1420 Some lint has been removed when using GCC_DEBUG_FLAGS with GCC 4.9.0.
1422 Changes affecting build procedure
1424 'zic' no longer links in localtime.o and asctime.o, as they're not needed.
1425 (Thanks to John Cochran.)
1427 Changes affecting documentation and commentary
1429 The 'Theory' file documents legacy names, the longstanding
1430 exceptions to the POSIX-inspired file name rules.
1432 The 'zic' documentation clarifies the role of time types when
1433 interpreting dates. (Thanks to Arthur David Olson.)
1435 Documentation and commentary now prefer UTF-8 to US-ASCII,
1436 allowing the use of proper accents in foreign words and names.
1437 Code and data have not changed because of this. (Thanks to
1438 Garrett Wollman, Ian Abbott, and Guy Harris for helping to debug
1441 Non-HTML documentation and commentary now use plain-text URLs instead of
1442 HTML insertions, and are more consistent about bracketing URLs when they
1443 are not already surrounded by white space. (Thanks to suggestions by
1446 There is new commentary about Xujiahui Observatory, the five time-zone
1447 project in China from 1918 to 1949, timekeeping in Japanese-occupied
1448 Shanghai, and Tibet Time in the 1950s. The sharp-eyed can spot the
1449 warlord Jin Shuren in the data.
1451 Commentary about the coverage of each Russian zone has been standardized.
1452 (Thanks to Tim Parenti).
1454 There is new commentary about contemporary timekeeping in Ethiopia.
1456 Obsolete comments about a 2007 proposal for DST in Kuwait has been removed.
1458 There is new commentary about time in Poland in 1919.
1460 Proper credit has been given to DST inventor George Vernon Hudson.
1462 Commentary about time in Metlakatla, AK and Resolute, NU has been
1463 improved, with a new source for the former.
1465 In zone.tab, Pacific/Easter no longer mentions Salas y Gómez, as it
1468 Commentary about permanent Antarctic bases has been updated.
1470 Several typos have been corrected. (Thanks to Tim Parenti for
1471 contributing some of these fixes.)
1473 tz-link.htm now mentions the JavaScript libraries Moment Timezone,
1474 TimezoneJS.Date, Walltime-js, and Timezone. (Thanks to a heads-up
1475 from Matt Johnson.) Also, it mentions the Go 'latlong' package.
1476 (Thanks to a heads-up from Dirkjan Ochtman.)
1478 The files usno1988, usno1989, usno1989a, usno1995, usno1997, and usno1998
1479 have been removed. These obsolescent US Naval Observatory entries were no
1480 longer helpful for maintenance. (Thanks to Tim Parenti for the suggestion.)
1483 Release 2014e - 2014-06-12 21:53:52 -0700
1485 Changes affecting near-future timestamps
1487 Egypt's 2014 Ramadan-based transitions are June 26 and July 31 at 24:00.
1488 (Thanks to Imed Chihi.) Guess that from 2015 on Egypt will temporarily
1489 switch to standard time at 24:00 the last Thursday before Ramadan, and
1490 back to DST at 00:00 the first Friday after Ramadan.
1492 Similarly, Morocco's are June 28 at 03:00 and August 2 at 02:00. (Thanks
1493 to Milamber Space Network.) Guess that from 2015 on Morocco will
1494 temporarily switch to standard time at 03:00 the last Saturday before
1495 Ramadan, and back to DST at 02:00 the first Saturday after Ramadan.
1497 Changes affecting past timestamps
1499 The abbreviation "MSM" (Moscow Midsummer Time) is now used instead of
1500 "MSD" for Moscow's double daylight time in summer 1921. Also, a typo
1501 "VLASST" has been repaired to be "VLAST" for Vladivostok summer time
1502 in 1991. (Thanks to Hank W. for reporting the problems.)
1504 Changes affecting commentary
1506 tz-link.htm now cites RFC 7265 for jCal, mentions PTP and the
1507 draft CalDAV extension, updates URLs for TSP, TZInfo, IATA, and
1508 removes stale pointers to World Time Explorer and WORLDTIME.
1511 Release 2014d - 2014-05-27 21:34:40 -0700
1513 Changes affecting code
1515 zic no longer generates files containing timestamps before the Big Bang.
1516 This works around GNOME bug 730332
1517 <https://bugzilla.gnome.org/show_bug.cgi?id=730332>.
1518 (Thanks to Leonardo Chiquitto for reporting the bug, and to
1519 Arthur David Olson and James Cloos for suggesting improvements to the fix.)
1521 Changes affecting documentation
1523 tz-link.htm now mentions GNOME.
1526 Release 2014c - 2014-05-13 07:44:13 -0700
1528 Changes affecting near-future timestamps
1530 Egypt observes DST starting 2014-05-15 at 24:00.
1531 (Thanks to Ahmad El-Dardiry and Gunther Vermier.)
1532 Details have not been announced, except that DST will not be observed
1533 during Ramadan. Guess that DST will stop during the same Ramadan dates as
1534 Morocco, and that Egypt's future spring and fall transitions will be the
1535 same as 2010 when it last observed DST, namely April's last Friday at
1536 00:00 to September's last Thursday at 23:00 standard time. Also, guess
1537 that Ramadan transitions will be at 00:00 standard time.
1539 Changes affecting code
1541 zic now generates transitions for minimum time values, eliminating guesswork
1542 when handling low-valued timestamps. (Thanks to Arthur David Olson.)
1544 Port to Cygwin sans glibc. (Thanks to Arthur David Olson.)
1546 Changes affecting commentary and documentation
1548 Remove now-confusing comment about Jordan. (Thanks to Oleksii Nochovnyi.)
1551 Release 2014b - 2014-03-24 21:28:50 -0700
1553 Changes affecting near-future timestamps
1555 Crimea switches to Moscow time on 2014-03-30 at 02:00 local time.
1556 (Thanks to Alexander Krivenyshev.) Move its zone.tab entry from UA to RU.
1558 New entry for Troll station, Antarctica. (Thanks to Paul-Inge Flakstad and
1559 Bengt-Inge Larsson.) This is currently an approximation; a better version
1560 will require the zic and localtime fixes mentioned below, and the plan is
1561 to wait for a while until at least the zic fixes propagate.
1563 Changes affecting code
1565 'zic' and 'localtime' no longer reject locations needing four transitions
1566 per year for the foreseeable future. (Thanks to Andrew Main (Zefram).)
1567 Also, 'zic' avoids some unlikely failures due to integer overflow.
1569 Changes affecting build procedure
1571 'make check' now detects Rule lines defined but never used.
1572 The NZAQ rules, an instance of this problem, have been removed.
1574 Changes affecting commentary and documentation
1576 Fix Tuesday/Thursday typo in description of time in Israel.
1577 (Thanks to Bert Katz via Pavel Kharitonov and Mike Frysinger.)
1579 Microsoft Windows 8.1 doesn't support tz database names. (Thanks
1580 to Donald MacQueen.) Instead, the Microsoft Windows Store app
1581 library supports them.
1583 Add comments about Johnston Island time in the 1960s.
1584 (Thanks to Lyle McElhaney.)
1586 Morocco's 2014 DST start will be as predicted.
1587 (Thanks to Sebastien Willemijns.)
1590 Release 2014a - 2014-03-07 23:30:29 -0800
1592 Changes affecting near-future timestamps
1594 Turkey begins DST on 2014-03-31, not 03-30. (Thanks to Faruk Pasin for
1595 the heads-up, and to Tim Parenti for simplifying the update.)
1597 Changes affecting past timestamps
1599 Fiji ended DST on 2014-01-19 at 02:00, not the previously-scheduled 03:00.
1600 (Thanks to Steffen Thorsen.)
1602 Ukraine switched from Moscow to Eastern European time on 1990-07-01
1603 (not 1992-01-01), and observed DST during the entire next winter.
1604 (Thanks to Vladimir in Moscow via Alois Treindl.)
1606 In 1988 Israel observed DST from 04-10 to 09-04, not 04-09 to 09-03.
1607 (Thanks to Avigdor Finkelstein.)
1609 Changes affecting code
1611 A uninitialized-storage bug in 'localtime' has been fixed.
1612 (Thanks to Logan Chien.)
1614 Changes affecting the build procedure
1616 The settings for 'make check_web' now default to Ubuntu 13.10.
1618 Changes affecting commentary and documentation
1620 The boundary of the US Pacific time zone is given more accurately.
1621 (Thanks to Alan Mintz.)
1623 Chile's 2014 DST will be as predicted. (Thanks to José Miguel Garrido.)
1625 Paraguay's 2014 DST will be as predicted. (Thanks to Carlos Raúl Perasso.)
1627 Better descriptions of countries with same time zone history as
1628 Trinidad and Tobago since 1970. (Thanks to Alan Barrett for suggestion.)
1630 Several changes affect tz-link.htm, the main web page.
1632 Mention Time.is (thanks to Even Scharning) and WX-now (thanks to
1635 Mention xCal (Internet RFC 6321) and jCal.
1637 Microsoft has some support for tz database names.
1639 CLDR data formats include both XML and JSON.
1641 Mention Maggiolo's map of solar vs standard time.
1642 (Thanks to Arthur David Olson.)
1644 Mention TZ4Net. (Thanks to Matt Johnson.)
1646 Mention the timezone-olson Haskell package.
1648 Mention zeitverschiebung.net. (Thanks to Martin Jäger.)
1650 Remove moribund links to daylight-savings-time.info and to
1651 Simple Timer + Clocks.
1653 Update two links. (Thanks to Oscar van Vlijmen.)
1655 Fix some formatting glitches, e.g., remove random newlines from
1656 abbr elements' title attributes.
1659 Release 2013i - 2013-12-17 07:25:23 -0800
1661 Changes affecting near-future timestamps:
1663 Jordan switches back to standard time at 00:00 on December 20, 2013.
1664 The 2006-2011 transition schedule is planned to resume in 2014.
1665 (Thanks to Steffen Thorsen.)
1667 Changes affecting past timestamps:
1669 In 2004, Cuba began DST on March 28, not April 4.
1670 (Thanks to Steffen Thorsen.)
1672 Changes affecting code
1674 The compile-time flag NOSOLAR has been removed, as nowadays the
1675 benefit of slightly shrinking runtime table size is outweighed by the
1676 cost of disallowing potential future updates that exceed old limits.
1678 Changes affecting documentation and commentary
1680 The files solar87, solar88, and solar89 are no longer distributed.
1681 They were a negative experiment - that is, a demonstration that
1682 tz data can represent solar time only with some difficulty and error.
1683 Their presence in the distribution caused confusion, as Riyadh
1684 civil time was generally not solar time in those years.
1686 tz-link.htm now mentions Noda Time. (Thanks to Matt Johnson.)
1689 Release 2013h - 2013-10-25 15:32:32 -0700
1691 Changes affecting current and future timestamps:
1693 Libya has switched its UT offset back to +02 without DST, instead
1694 of +01 with DST. (Thanks to Even Scharning.)
1696 Western Sahara (Africa/El_Aaiun) uses Morocco's DST rules.
1697 (Thanks to Gwillim Law.)
1699 Changes affecting future timestamps:
1701 Acre and (we guess) western Amazonas will switch from UT -04 to -05
1702 on 2013-11-10. This affects America/Rio_Branco and America/Eirunepe.
1703 (Thanks to Steffen Thorsen.)
1705 Add entries for DST transitions in Morocco in the year 2038.
1706 This avoids some year-2038 glitches introduced in 2013g.
1707 (Thanks to Yoshito Umaoka for reporting the problem.)
1709 Changes affecting API
1711 The 'tzselect' command no longer requires the 'select' command,
1712 and should now work with /bin/sh on more platforms. It also works
1713 around a bug in BusyBox awk before version 1.21.0. (Thanks to
1714 Patrick 'P. J.' McDermott and Alan Barrett.)
1716 Changes affecting code
1718 Fix localtime overflow bugs with 32-bit unsigned time_t.
1720 zdump no longer assumes sscanf returns maximal values on overflow.
1722 Changes affecting the build procedure
1724 The builder can specify which programs to use, if any, instead of
1725 'ar' and 'ranlib', and libtz.a is now built locally before being
1726 installed. (Thanks to Michael Forney.)
1728 A dependency typo in the 'zdump' rule has been fixed.
1729 (Thanks to Andrew Paprocki.)
1731 The Makefile has been simplified by assuming that 'mkdir -p' and 'cp -f'
1732 work as specified by POSIX.2-1992 or later; this is portable nowadays.
1734 'make clean' no longer removes 'leapseconds', since it's
1735 host-independent and is part of the distribution.
1737 The unused makefile macros TZCSRCS, TZDSRCS, DATESRCS have been removed.
1739 Changes affecting documentation and commentary
1741 tz-link.htm now mentions TC TIMEZONE's draft time zone service protocol
1742 (thanks to Mike Douglass) and TimezoneJS.Date (thanks to Jim Fehrle).
1744 Update URLs in tz-link page. Add URLs for Microsoft Windows, since
1745 8.1 introduces tz support. Remove URLs for Tru64 and UnixWare (no
1746 longer maintained) and for old advisories. SOFA now does C.
1748 Release 2013g - 2013-09-30 21:08:26 -0700
1750 Changes affecting current and near-future timestamps
1752 Morocco now observes DST from the last Sunday in March to the last
1753 Sunday in October, not April to September respectively. (Thanks
1754 to Steffen Thorsen.)
1756 Changes affecting 'zic'
1758 'zic' now runs on platforms that lack both hard links and symlinks.
1759 (Thanks to Theo Veenker for reporting the problem, for MinGW.)
1760 Also, fix some bugs on platforms that lack hard links but have symlinks.
1762 'zic -v' again warns that Asia/Tehran has no POSIX environment variable
1763 to predict the far future, fixing a bug introduced in 2013e.
1765 Changes affecting the build procedure
1767 The 'leapseconds' file is again put into the tzdata tarball.
1768 Also, 'leapseconds.awk', so tzdata is self-contained. (Thanks to
1769 Matt Burgess and Ian Abbott.) The timestamps of these and other
1770 dependent files in tarballs are adjusted more consistently.
1772 Changes affecting documentation and commentary
1774 The README file is now part of the data tarball as well as the code.
1775 It now states that files are public domain unless otherwise specified.
1776 (Thanks to Andrew Main (Zefram) for asking for clarifications.)
1777 Its details about the 1989 release moved to a place of honor near
1781 Release 2013f - 2013-09-24 23:37:36 -0700
1783 Changes affecting near-future timestamps
1785 Tocantins will very likely not observe DST starting this spring.
1786 (Thanks to Steffen Thorsen.)
1788 Jordan will likely stay at UT +03 indefinitely, and will not fall
1791 Palestine will fall back at 00:00, not 01:00. (Thanks to Steffen Thorsen.)
1793 Changes affecting API
1795 The types of the global variables 'timezone' and 'altzone' (if present)
1796 have been changed back to 'long'. This is required for 'timezone'
1797 by POSIX, and for 'altzone' by common practice, e.g., Solaris 11.
1798 These variables were originally 'long' in the tz code, but were
1799 mistakenly changed to 'time_t' in 1987; nobody reported the
1800 incompatibility until now. The difference matters on x32, where
1801 'long' is 32 bits and 'time_t' is 64. (Thanks to Elliott Hughes.)
1803 Changes affecting the build procedure
1805 Avoid long strings in leapseconds.awk to work around a mawk bug.
1806 (Thanks to Cyril Baurand.)
1808 Changes affecting documentation and commentary
1810 New file 'NEWS' that contains release notes like this one.
1812 Paraguay's law does not specify DST transition time; 00:00 is customary.
1813 (Thanks to Waldemar Villamayor-Venialbo.)
1815 Minor capitalization fixes.
1817 Changes affecting version-control only
1819 The experimental GitHub repository now contains annotated and
1820 signed tags for recent releases, e.g., '2013e' for Release 2013e.
1821 Releases are tagged starting with 2012e; earlier releases were
1822 done differently, and tags would either not have a simple name or
1823 not exactly match what was released.
1825 'make set-timestamps' is now simpler and a bit more portable.
1828 Release 2013e - 2013-09-19 23:50:04 -0700
1830 Changes affecting near-future timestamps
1832 This year Fiji will start DST on October 27, not October 20.
1833 (Thanks to David Wheeler for the heads-up.) For now, guess that
1834 Fiji will continue to spring forward the Sunday before the fourth
1837 Changes affecting current and future time zone abbreviations
1839 Use WIB/WITA/WIT rather than WIT/CIT/EIT for alphabetic Indonesian
1840 time zone abbreviations since 1932. (Thanks to George Ziegler,
1841 Priyadi Iman Nurcahyo, Zakaria, Jason Grimes, Martin Pitt, and
1842 Benny Lin.) This affects Asia/Dili, Asia/Jakarta, Asia/Jayapura,
1843 Asia/Makassar, and Asia/Pontianak.
1845 Use ART (UT -03, standard time), rather than WARST (also -03, but
1846 daylight saving time) for San Luis, Argentina since 2009.
1848 Changes affecting Godthåb timestamps after 2037 if version mismatch
1850 Allow POSIX-like TZ strings where the transition time's hour can
1851 range from -167 through 167, instead of the POSIX-required 0
1852 through 24. E.g., TZ='FJT-12FJST,M10.3.1/146,M1.3.4/75' for the
1853 new Fiji rules. This is a more-compact way to represent
1854 far-future timestamps for America/Godthab, America/Santiago,
1855 Antarctica/Palmer, Asia/Gaza, Asia/Hebron, Asia/Jerusalem,
1856 Pacific/Easter, and Pacific/Fiji. Other zones are unaffected by
1857 this change. (Derived from a suggestion by Arthur David Olson.)
1859 Allow POSIX-like TZ strings where daylight saving time is in
1860 effect all year. E.g., TZ='WART4WARST,J1/0,J365/25' for Western
1861 Argentina Summer Time all year. This supports a more-compact way
1862 to represent the 2013d data for America/Argentina/San_Luis.
1863 Because of the change for San Luis noted above this change does not
1864 affect the current data. (Thanks to Andrew Main (Zefram) for
1865 suggestions that improved this change.)
1867 Where these two TZ changes take effect, there is a minor extension
1868 to the tz file format in that it allows new values for the
1869 embedded TZ-format string, and the tz file format version number
1870 has therefore been increased from 2 to 3 as a precaution.
1871 Version-2-based client code should continue to work as before for
1872 all timestamps before 2038. Existing version-2-based client code
1873 (tzcode, GNU/Linux, Solaris) has been tested on version-3-format
1874 files, and typically works in practice even for timestamps after
1875 2037; the only known exception is America/Godthab.
1877 Changes affecting timestamps before 1970
1879 Pacific/Johnston is now a link to Pacific/Honolulu. This corrects
1880 some errors before 1947.
1882 Some zones have been turned into links, when they differ from existing
1883 zones only in older data entries that were likely invented or that
1884 differ only in LMT or transitions from LMT. These changes affect
1885 only timestamps before 1943. The affected zones are:
1886 Africa/Juba, America/Anguilla, America/Aruba, America/Dominica,
1887 America/Grenada, America/Guadeloupe, America/Marigot,
1888 America/Montserrat, America/St_Barthelemy, America/St_Kitts,
1889 America/St_Lucia, America/St_Thomas, America/St_Vincent,
1890 America/Tortola, and Europe/Vaduz. (Thanks to Alois Treindl for
1891 confirming that the old Europe/Vaduz zone was wrong and the new
1892 link is better for WWII-era times.)
1894 Change Kingston Mean Time from -5:07:12 to -5:07:11. This affects
1895 America/Cayman, America/Jamaica and America/Grand_Turk timestamps
1898 Change the UT offset of Bern Mean Time from 0:29:44 to 0:29:46.
1899 This affects Europe/Zurich timestamps from 1853 to 1894. (Thanks
1902 Change the date of the circa-1850 Zurich transition from 1849-09-12
1903 to 1853-07-16, overriding Shanks with data from Messerli about
1904 postal and telegraph time in Switzerland.
1906 Changes affecting time zone abbreviations before 1970
1908 For Asia/Jakarta, use BMT (not JMT) for mean time from 1923 to 1932,
1909 as Jakarta was called Batavia back then.
1911 Changes affecting API
1913 The 'zic' command now outputs a dummy transition when far-future
1914 data can't be summarized using a TZ string, and uses a 402-year
1915 window rather than a 400-year window. For the current data, this
1916 affects only the Asia/Tehran file. It does not affect any of the
1917 timestamps that this file represents, so zdump outputs the same
1918 information as before. (Thanks to Andrew Main (Zefram).)
1920 The 'date' command has a new '-r' option, which lets you specify
1921 the integer time to display, a la FreeBSD.
1923 The 'tzselect' command has two new options '-c' and '-n', which lets you
1924 select a zone based on latitude and longitude.
1926 The 'zic' command's '-v' option now warns about constructs that
1927 require the new version-3 binary file format. (Thanks to Arthur
1928 David Olson for the suggestion.)
1930 Support for floating-point time_t has been removed.
1931 It was always dicey, and POSIX no longer requires it.
1932 (Thanks to Eric Blake for suggesting to the POSIX committee to
1933 remove it, and thanks to Alan Barrett, Clive D.W. Feather, Andy
1934 Heninger, Arthur David Olson, and Alois Treindl, for reporting
1935 bugs and elucidating some of the corners of the old floating-point
1938 The signatures of 'offtime', 'timeoff', and 'gtime' have been
1939 changed back to the old practice of using 'long' to represent UT
1940 offsets. This had been inadvertently and mistakenly changed to
1941 'int_fast32_t'. (Thanks to Christos Zoulas.)
1943 The code avoids undefined behavior on integer overflow in some
1944 more places, including gmtime, localtime, mktime and zdump.
1946 Changes affecting the zdump utility
1948 zdump now outputs "UT" when referring to Universal Time, not "UTC".
1949 "UTC" does not make sense for timestamps that predate the introduction
1950 of UTC, whereas "UT", a more-generic term, does. (Thanks to Steve Allen
1951 for clarifying UT vs UTC.)
1953 Data changes affecting behavior of tzselect and similar programs
1955 Country code BQ is now called the more-common name "Caribbean Netherlands"
1956 rather than the more-official "Bonaire, St Eustatius & Saba".
1958 Remove from zone.tab the names America/Montreal, America/Shiprock,
1959 and Antarctica/South_Pole, as they are equivalent to existing
1960 same-country-code zones for post-1970 timestamps. The data entries for
1961 these names are unchanged, so the names continue to work as before.
1963 Changes affecting code internals
1965 zic -c now runs way faster on 64-bit hosts when given large numbers.
1967 zic now uses vfprintf to avoid allocating and freeing some memory.
1969 tzselect now computes the list of continents from the data,
1970 rather than have it hard-coded.
1972 Minor changes pacify GCC 4.7.3 and GCC 4.8.1.
1974 Changes affecting the build procedure
1976 The 'leapseconds' file is now generated automatically from a
1977 new file 'leap-seconds.list', which is a copy of
1978 <ftp://time.nist.gov/pub/leap-seconds.list>.
1979 A new source file 'leapseconds.awk' implements this.
1980 The goal is simplification of the future maintenance of 'leapseconds'.
1982 When building the 'posix' or 'right' subdirectories, if the
1983 subdirectory would be a copy of the default subdirectory, it is
1984 now made a symbolic link if that is supported. This saves about
1985 2 MB of file system space.
1987 The links America/Shiprock and Antarctica/South_Pole have been
1988 moved to the 'backward' file. This affects only nondefault builds
1989 that omit 'backward'.
1991 Changes affecting version-control only
1993 .gitignore now ignores 'date'.
1995 Changes affecting documentation and commentary
1997 Changes to the 'tzfile' man page
1999 It now mentions that the binary file format may be extended in
2000 future versions by appending data.
2002 It now refers to the 'zdump' and 'zic' man pages.
2004 Changes to the 'zic' man page
2006 It lists conditions that elicit a warning with '-v'.
2008 It says that the behavior is unspecified when duplicate names
2009 are given, or if the source of one link is the target of another.
2011 Its examples are updated to match the latest data.
2013 The definition of white space has been clarified slightly.
2014 (Thanks to Michael Deckers.)
2016 Changes to the 'Theory' file
2018 There is a new section about the accuracy of the tz database,
2019 describing the many ways that errors can creep in, and
2020 explaining why so many of the pre-1970 timestamps are wrong or
2021 misleading (thanks to Steve Allen, Lester Caine, and Garrett
2022 Wollman for discussions that contributed to this).
2024 The 'Theory' file describes LMT better (this follows a
2025 suggestion by Guy Harris).
2027 It refers to the 2013 edition of POSIX rather than the 2004 edition.
2029 It's mentioned that excluding 'backward' should not affect the
2030 other data, and it suggests at least one zone.tab name per
2031 inhabited country (thanks to Stephen Colebourne).
2033 Some longstanding restrictions on names are documented, e.g.,
2034 'America/New_York' precludes 'America/New_York/Bronx'.
2036 It gives more reasons for the 1970 cutoff.
2038 It now mentions which time_t variants are supported, such as
2039 signed integer time_t. (Thanks to Paul Goyette for reporting
2040 typos in an experimental version of this change.)
2042 (Thanks to Philip Newton for correcting typos in these changes.)
2044 Documentation and commentary is more careful to distinguish UT in
2045 general from UTC in particular. (Thanks to Steve Allen.)
2047 Add a better source for the Zurich 1894 transition.
2048 (Thanks to Pierre-Yves Berger.)
2050 Update shapefile citations in tz-link.htm. (Thanks to Guy Harris.)
2053 Release 2013d - 2013-07-05 07:38:01 -0700
2055 Changes affecting future timestamps:
2057 Morocco's midsummer transitions this year are July 7 and August 10,
2058 not July 9 and August 8. (Thanks to Andrew Paprocki.)
2060 Israel now falls back on the last Sunday of October.
2061 (Thanks to Ephraim Silverberg.)
2063 Changes affecting past timestamps:
2065 Specify Jerusalem's location more precisely; this changes the pre-1880
2068 Changing affecting metadata only:
2070 Fix typos in the entries for country codes BQ and SX.
2072 Changes affecting code:
2074 Rework the code to fix a bug with handling Australia/Macquarie on
2075 32-bit hosts (thanks to Arthur David Olson).
2077 Port to platforms like NetBSD, where time_t can be wider than long.
2079 Add support for testing time_t types other than the system's.
2080 Run 'make check_time_t_alternatives' to try this out.
2081 Currently, the tests fail for unsigned time_t;
2082 this should get fixed at some point.
2084 Changes affecting documentation and commentary:
2086 Deemphasize the significance of national borders.
2088 Update the zdump man page.
2090 Remove obsolete NOID comment (thanks to Denis Excoffier).
2092 Update several URLs and comments in the web pages.
2094 Spelling fixes (thanks to Kevin Lyda and Jonathan Leffler).
2096 Update URL for CLDR Zone->Tzid table (thanks to Yoshito Umaoka).
2099 Release 2013c - 2013-04-19 16:17:40 -0700
2101 Changes affecting current and future timestamps:
2103 Palestine observed DST starting March 29, 2013. (Thanks to
2104 Steffen Thorsen.) From 2013 on, Gaza and Hebron both observe DST,
2105 with the predicted rules being the last Thursday in March at 24:00
2106 to the first Friday on or after September 21 at 01:00.
2108 Assume that the recent change to Paraguay's DST rules is permanent,
2109 by moving the end of DST to the 4th Sunday in March every year.
2110 (Thanks to Carlos Raúl Perasso.)
2112 Changes affecting past timestamps:
2114 Fix some historical data for Palestine to agree with that of
2115 timeanddate.com, as follows:
2117 The spring 2008 change in Gaza and Hebron was on 00:00 Mar 28, not
2120 The fall 2009 change in Gaza and Hebron on Sep 4 was at 01:00, not
2123 The spring 2010 change in Hebron was 00:00 Mar 26, not 00:01 Mar 27.
2125 The spring 2011 change in Gaza was 00:01 Apr 1, not 12:01 Apr 2.
2127 The spring 2011 change in Hebron on Apr 1 was at 00:01, not 12:01.
2129 The fall 2011 change in Hebron on Sep 30 was at 00:00, not 03:00.
2131 Fix times of habitation for Macquarie to agree with the Tasmania
2132 Parks & Wildlife Service history, which indicates that permanent
2133 habitation was 1899-1919 and 1948 on.
2135 Changing affecting metadata only:
2137 Macquarie Island is politically part of Australia, not Antarctica.
2138 (Thanks to Tobias Conradi.)
2140 Sort Macquarie more-consistently with other parts of Australia.
2141 (Thanks to Tim Parenti.)
2144 Release 2013b - 2013-03-10 22:33:40 -0700
2146 Changes affecting current and future timestamps:
2148 Haiti uses US daylight-saving rules this year, and presumably future years.
2149 This changes timestamps starting today. (Thanks to Steffen Thorsen.)
2151 Paraguay will end DST on March 24 this year.
2152 (Thanks to Steffen Thorsen.) For now, assume it's just this year.
2154 Morocco does not observe DST during Ramadan;
2155 try to predict Ramadan in Morocco as best we can.
2156 (Thanks to Erik Homoet for the heads-up.)
2158 Changes affecting commentary:
2160 Update URLs in tz-link page. Add URLs for webOS, BB10, iOS.
2161 Update URL for Solaris. Mention Internet RFC 6557.
2162 Update Internet RFCs 2445->5545, 2822->5322.
2163 Switch from FTP to HTTP for Internet RFCs.
2166 Release 2013a - 2013-02-27 09:20:35 -0800
2168 Change affecting binary data format:
2170 The zone offset at the end of version-2-format zone files is now
2171 allowed to be 24:00, as per POSIX.1-2008. (Thanks to Arthur David Olson.)
2173 Changes affecting current and future timestamps:
2175 Chile's 2013 rules, and we guess rules for 2014 and later, will be
2176 the same as 2012, namely Apr Sun>=23 03:00 UTC to Sep Sun>=2 04:00 UTC.
2177 (Thanks to Steffen Thorsen and Robert Elz.)
2179 New Zones Asia/Khandyga, Asia/Ust-Nera, Europe/Busingen.
2180 (Thanks to Tobias Conradi and Arthur David Olson.)
2182 Many changes affect historical timestamps before 1940.
2183 These were deduced from: Milne J. Civil time. Geogr J. 1899
2184 Feb;13(2):173-94 <http://www.jstor.org/stable/1774359>.
2186 Changes affecting the code:
2188 Fix zic bug that mishandled Egypt's 2010 changes (this also affected
2189 the data). (Thanks to Arthur David Olson.)
2191 Fix localtime bug when time_t is unsigned and data files were generated
2192 by a signed time_t system. (Thanks to Doug Bailey for reporting and
2193 to Arthur David Olson for fixing.)
2195 Allow the email address for bug reports to be set by the packager.
2196 The default is tz@iana.org, as before. (Thanks to Joseph S. Myers.)
2198 Update HTML checking to be compatible with Ubuntu 12.10.
2200 Check that files are a safe subset of ASCII. At some point we may
2201 relax this requirement to a safe subset of UTF-8. Without the
2202 check, some non-UTF-8 encodings were leaking into the distribution.
2206 Restore a comment about copyright notices that was inadvertently deleted.
2207 (Thanks to Arthur David Olson.)
2209 Improve the commentary about which districts observe what times
2210 in Russia. (Thanks to Oscar van Vlijmen and Arthur David Olson).
2212 Add web page links to tz.js.
2214 Add "Run by the Monkeys" to tz-art. (Thanks to Arthur David Olson.)
2217 Release 2012j - 2012-11-12 18:34:49 -0800
2219 Libya moved to CET this weekend, but with DST planned next year.
2220 (Thanks to Even Scharning, Steffen Thorsen, and Tim Parenti.)
2222 Signatures now have the extension .asc, not .sign, as that's more
2223 standard. (Thanks to Phil Pennock.)
2225 The output of 'zdump --version', and of 'zic --version', now
2226 uses a format that is more typical for --version.
2227 (Thanks to Joseph S. Myers.)
2229 The output of 'tzselect --help', 'zdump --help', and 'zic --help'
2230 now uses tz@iana.org rather than the old elsie address.
2232 zic -v now complains about abbreviations that are less than 3
2233 or more than 6 characters, as per Posix. Formerly, it checked
2234 for abbreviations that were more than 3.
2236 'make public' no longer puts its temporary directory under /tmp,
2237 and uses the just-built zic rather than the system zic.
2239 Various fixes to documentation and commentary.
2242 Release 2012i - 2012-11-03 12:57:09 -0700
2244 Cuba switches from DST tomorrow at 01:00. (Thanks to Steffen Thorsen.)
2246 Linker flags can now be specified via LDFLAGS.
2247 AWK now defaults to 'awk', not 'nawk'.
2248 The shell in tzselect now defaults to /bin/bash, but this can
2249 be overridden by specifying KSHELL.
2250 The main web page now mentions the unofficial GitHub repository.
2251 (Thanks to Mike Frysinger.)
2253 Tarball signatures can now be built by running 'make signatures'.
2254 There are also new makefile rules 'tarballs', 'check_public', and
2255 separate makefile rules for each tarball and signature file.
2256 A few makefile rules are now more portable to strict POSIX.
2258 The main web page now lists the canonical IANA URL.
2261 Release 2012h - 2012-10-26 22:49:10 -0700
2263 Bahia no longer has DST. (Thanks to Kelley Cook.)
2265 Tocantins has DST. (Thanks to Rodrigo Severo.)
2267 Israel has new DST rules next year. (Thanks to Ephraim Silverberg.)
2269 Jordan stays on DST this winter. (Thanks to Steffen Thorsen.)
2273 More C modernization, except that at Arthur David Olson's suggestion
2274 the instances of 'register' were kept.
2277 Release 2012g - 2012-10-17 20:59:45 -0700
2279 Samoa fall 2012 and later. (Thanks to Nicholas Pereira and Robert Elz.)
2281 Palestine fall 2012. (Thanks to Steffen Thorsen.)
2285 To attack the version-number problem, this release ships the file
2286 'Makefile' (which contains the release number) in both the tzcode and
2287 the tzdata tarballs. The two Makefiles are identical, and should be
2288 identical in any matching pair of tarballs, so it shouldn't matter
2289 which order you extract the tarballs. Perhaps we can come up with a
2290 better version-number scheme at some point; this scheme does have the
2291 virtue of not adding more files.
2294 Release 2012f - 2012-09-12 23:17:03 -0700
2296 * australasia (Pacific/Fiji): Fiji DST is October 21 through January
2297 20 this year. (Thanks to Steffen Thorsen.)
2300 Release 2012e - 2012-08-02 20:44:55 -0700
2302 * australasia (Pacific/Fakaofo): Tokelau is UT +13, not +14.
2303 (Thanks to Steffen Thorsen.)
2305 * Use a single version number for both code and data.
2307 * .gitignore: New file.
2309 * Remove trailing white space.
2312 Release code2012c-data2012d - 2012-07-19 16:35:33 -0700
2314 Changes for Morocco's timestamps, which take effect in a couple of
2315 hours, along with infrastructure changes to accommodate how the tz
2316 code and data are released on IANA.
2319 Release data2012c - 2012-03-27 12:17:25 -0400
2322 Summer time changes for Morocco (to start late April 2012)
2325 Changes for 2012 for Gaza & the West Bank (Hebron) and Syria
2328 Haiti following US/Canada rules for 2012 (and we're assuming,
2329 for now anyway, for the future).
2332 Release 2012b - 2012-03-02 12:29:15 +0700
2334 There is just one change to tzcode2012b (compared with 2012a):
2335 the Makefile that was accidentally included with 2012a has been
2336 replaced with the version that should have been there, which is
2337 identical with the previous version (from tzcode2011i).
2339 There are just two changes in tzdata2012b compared with 2012a.
2341 Most significantly, summer time in Cuba has been delayed 3 weeks
2342 (now starts April 1 rather than March 11). Since Mar 11 (the old start
2343 date, as listed in 2012a) is just a little over a week away, this
2346 Less importantly, an excess tab in one of the changes in zone.tab
2347 in 2012a has been removed.
2350 Release 2012a - 2012-03-01 18:28:10 +0700
2352 The changes in tzcode2012a (compared to the previous version, 2011i)
2353 are entirely to the README and tz-art.htm and tz-link.htm files, if
2354 none of those concern you, you can ignore the code update. The changes
2355 reflect the changed addresses for the mailing list and the code and
2356 data distribution points & methods (and a link to DateTime::TimeZone::Tzfile
2357 has been added to tz-link.htm).
2359 In tzdata2012a (compared to the previous release, which was 2011n)
2360 the major changes are:
2361 Chile 2011/2012 and 2012/2013 summer time date adjustments.
2362 Falkland Islands onto permanent summer time (we're assuming for the
2363 foreseeable future, though 2012 is all we're fairly certain of.)
2364 Armenia has abolished Summer Time.
2365 Tokelau jumped the International Date Line back last December
2366 (just the same as their near neighbour, Samoa).
2367 America/Creston is a new zone for a small area of British Columbia
2368 There will be a leapsecond 2012-06-30 23:59:60 UTC.
2370 Other minor changes are:
2371 Corrections to 1918 Canadian summer time end dates.
2372 Updated URL for UK time zone history (in comments)
2373 A few typos in Le Corre's list of free French place names (comments)
2376 Release data2011n - 2011-10-30 14:57:54 +0700
2378 There are three changes of note - most urgently, Cuba (America/Havana)
2379 has extended summer time by two weeks, now to end on Nov 13, rather than
2380 the (already past) Oct 30. Second, the Pridnestrovian Moldavian Republic
2381 (Europe/Tiraspol) decided not to split from the rest of Moldova after
2382 all, and consequently that zone has been removed (again) and reinstated
2383 in the "backward" file as a link to Europe/Chisinau. And third, the
2384 end date for Fiji's summer time this summer was moved forward from the
2385 earlier planned Feb 26, to Jan 22.
2387 Apart from that, Moldova (MD) returns to a single entry in zone.tab
2388 (and the incorrect syntax that was in the 2011m version of that file
2389 is so fixed - it would have been fixed in a different way had this
2390 change not happened - that's the "missing" sccs version id).
2393 Release data2011m - 2011-10-24 21:42:16 +0700
2395 In particular, the typos in comments in the data (2011-11-17 should have
2396 been 2011-10-17 as Alan Barrett noted, and spelling of Tiraspol that
2397 Tim Parenti noted) have been fixed, and the change for Ukraine has been
2398 made in all 4 Ukrainian zones, rather than just Kiev (again, thanks to
2399 Tim Parenti, and also Denys Gavrysh)
2401 In addition, I added Europe/Tiraspol to zone.tab.
2403 This time, all the files have new version numbers... (including the files
2404 otherwise unchanged in 2011m that were changed in 2011l but didn't get new
2405 version numbers there...)
2408 Release data2011l - 2011-10-10 11:15:43 +0700
2410 There are just 2 changes that cause different generated tzdata files from
2411 zic, to Asia/Hebron and Pacific/Fiji - the possible change for Bahia, Brazil
2412 is included, but commented out. Compared with the diff I sent out last week,
2413 this version also includes attributions for the sources for the changes
2414 (in much the same format as ado used, but the html tags have not been
2415 checked, verified, or used in any way at all, so if there are errors there,
2416 please let me know.)
2419 Release data2011k - 2011-09-20 17:54:03 -0400
2424 Release data2011j - 2011-09-12 09:22:49 -0400
2426 (contemporary changes for Samoa; past changes for Kenya, Uganda, and
2427 Tanzania); there are also two spelling corrections to comments in
2428 the australasia file (with thanks to Christos Zoulas).
2431 Release 2011i - 2011-08-29 05:56:32 -0400
2436 Release data2011h - 2011-06-15 18:41:48 -0400
2438 Russia and Curaçao changes
2441 Release 2011g - 2011-04-25 09:07:22 -0400
2443 update the rules for Egypt to reflect its abandonment of DST this year
2446 Release 2011f - 2011-04-06 17:14:53 -0400
2451 Release 2011e - 2011-03-31 16:04:38 -0400
2453 Morocco, Chile, and tz-link changes
2456 Release 2011d - 2011-03-14 09:18:01 -0400
2458 changes that impact present-day timestamps in Cuba, Samoa, and Turkey
2461 Release 2011c - 2011-03-07 09:30:09 -0500
2463 These do affect current timestamps in Chile and Annette Island, Canada.
2466 Release 2011b - 2011-02-07 08:44:50 -0500
2471 Release 2011a - 2011-01-24 10:30:16 -0500
2476 Release data2010o - 2010-11-01 09:18:23 -0400
2478 change to the end of DST in Fiji in 2011
2481 Release 2010n - 2010-10-25 08:19:17 -0400
2486 Release 2010m - 2010-09-27 09:24:48 -0400
2488 Hong Kong, Vostok, and zic.c changes
2491 Release 2010l - 2010-08-16 06:57:25 -0400
2496 Release 2010k - 2010-07-26 10:42:27 -0400
2501 Release 2010j - 2010-05-10 09:07:48 -0400
2503 changes for Bahía de Banderas and for version naming
2506 Release data2010i - 2010-04-16 18:50:45 -0400
2508 the end of DST in Morocco on 2010-08-08
2511 Release data2010h - 2010-04-05 09:58:56 -0400
2516 Release data2010g - 2010-03-24 11:14:53 -0400
2521 Release 2010f - 2010-03-22 09:45:46 -0400
2526 Release data2010e - 2010-03-08 14:24:27 -0500
2528 corrects the Dhaka bug found by Danvin Ruangchan
2531 Release data2010d - 2010-03-06 07:26:01 -0500
2536 Release 2010c - 2010-03-01 09:20:58 -0500
2538 changes including KRE's suggestion for earlier initialization of
2539 "goahead" and "goback" structure elements
2542 Release code2010a - 2010-02-16 10:40:04 -0500
2547 Release data2010b - 2010-01-20 12:37:01 -0500
2552 Release data2010a - 2010-01-18 08:30:04 -0500
2557 Release data2009u - 2009-12-26 08:32:28 -0500
2559 changes to DST in Bangladesh
2562 Release 2009t - 2009-12-21 13:24:27 -0500
2567 Release data2009s - 2009-11-14 10:26:32 -0500
2569 (cosmetic) Antarctica change and the DST-in-Fiji-in-2009-and-2010 change
2572 Release 2009r - 2009-11-09 10:10:31 -0500
2574 "antarctica" and "tz-link.htm" changes
2577 Release 2009q - 2009-11-02 09:12:40 -0500
2579 with two corrections as reported by Eric Muller and Philip Newton
2582 Release data2009p - 2009-10-23 15:05:27 -0400
2584 Argentina (including San Luis) changes (with the correction from
2588 Release data2009o - 2009-10-14 16:49:38 -0400
2590 Samoa (commentary only), Pakistan, and Bangladesh changes
2593 Release data2009n - 2009-09-22 15:13:38 -0400
2595 added commentary for Argentina and a change to the end of DST in
2599 Release data2009m - 2009-09-03 10:23:43 -0400
2601 Samoa and Palestine changes
2604 Release data2009l - 2009-08-14 09:13:07 -0400
2606 Samoa (comments only) and Egypt
2609 Release 2009k - 2009-07-20 09:46:08 -0400
2614 Release data2009j - 2009-06-15 06:43:59 -0400
2616 Bangladesh change (with a short turnaround since the DST change is
2620 Release 2009i - 2009-06-08 09:21:22 -0400
2622 updating for DST in Bangladesh this year
2625 Release 2009h - 2009-05-26 09:19:14 -0400
2630 Release data2009g - 2009-04-20 16:34:07 -0400
2635 Release data2009f - 2009-04-10 11:00:52 -0400
2637 correct DST in Pakistan
2640 Release 2009e - 2009-04-06 09:08:11 -0400
2645 Release 2009d - 2009-03-23 09:38:12 -0400
2647 Morocco, Tunisia, Argentina, and American Astronomical Society changes
2650 Release data2009c - 2009-03-16 09:47:51 -0400
2652 change to the start of Cuban DST
2655 Release 2009b - 2009-02-09 11:15:22 -0500
2660 Release 2009a - 2009-01-21 10:09:39 -0500
2665 Release data2008i - 2008-10-21 12:10:25 -0400
2667 southamerica and zone.tab files, with Argentina DST rule changes and
2668 United States zone reordering and recommenting
2671 Release 2008h - 2008-10-13 07:33:56 -0400
2676 Release 2008g - 2008-10-06 09:03:18 -0400
2678 Fix a broken HTML anchor and update Brazil's DST transitions;
2679 there's also a slight reordering of information in tz-art.htm.
2682 Release data2008f - 2008-09-09 22:33:26 -0400
2687 Release 2008e - 2008-07-28 14:11:17 -0400
2689 changes by Arthur David Olson and Jesper Nørgaard Welen
2692 Release data2008d - 2008-07-07 09:51:38 -0400
2694 changes by Arthur David Olson, Paul Eggert, and Rodrigo Severo
2697 Release data2008c - 2008-05-19 17:48:03 -0400
2699 Pakistan, Morocco, and Mongolia
2702 Release data2008b - 2008-03-24 08:30:59 -0400
2704 including renaming Asia/Calcutta to Asia/Kolkata, with a backward
2708 Release 2008a - 2008-03-08 05:42:16 -0500
2713 Release 2007k - 2007-12-31 10:25:22 -0500
2715 most importantly, changes to the "southamerica" file based on
2716 Argentina's readoption of daylight saving time
2719 Release 2007j - 2007-12-03 09:51:01 -0500
2721 1. eliminate the "P" (parameter) macro;
2723 2. the "noncontroversial" changes circulated on the time zone
2724 mailing list (less the changes to "logwtmp.c");
2726 3. eliminate "too many transition" errors when "min" is used in time
2729 4. changes by Paul Eggert (including updated information for Venezuela).
2732 Release data2007i - 2007-10-30 10:28:11 -0400
2734 changes for Cuba and Syria
2737 Release 2007h - 2007-10-01 10:05:51 -0400
2739 changes by Paul Eggert, as well as an updated link to the ICU
2740 project in tz-link.htm
2743 Release 2007g - 2007-08-20 10:47:59 -0400
2745 changes by Paul Eggert
2747 The "leapseconds" file has been updated to incorporate the most
2748 recent International Earth Rotation and Reference Systems Service
2751 There's an addition to tz-art.htm regarding the television show "Medium".
2754 Release 2007f - 2007-05-07 10:46:46 -0400
2756 changes by Paul Eggert (including Haiti, Turks and Caicos, and New
2759 changes to zic.c to allow hour values greater than 24 (along with
2760 Paul's improved time value overflow checking)
2763 Release 2007e - 2007-04-02 10:11:52 -0400
2765 Syria and Honduras changes by Paul Eggert
2767 zic.c variable renaming changes by Arthur David Olson
2770 Release 2007d - 2007-03-20 08:48:30 -0400
2772 changes by Paul Eggert
2774 the elimination of white space at the ends of lines
2777 Release 2007c - 2007-02-26 09:09:37 -0500
2779 changes by Paul Eggert
2782 Release 2007b - 2007-02-12 09:34:20 -0500
2784 Paul Eggert's proposed change to the quotation handling logic in zic.c.
2786 changes to the commentary in "leapseconds" reflecting the IERS
2787 announcement that there is to be no positive leap second at the end
2791 Release 2007a - 2007-01-08 12:28:29 -0500
2793 changes by Paul Eggert
2795 Derick Rethan's Asmara change
2797 Oscar van Vlijmen's Easter Island local mean time change
2799 symbolic link changes
2802 Release 2006p - 2006-11-27 08:54:27 -0500
2804 changes by Paul Eggert
2807 Release 2006o - 2006-11-06 09:18:07 -0500
2809 changes by Paul Eggert
2812 Release 2006n - 2006-10-10 11:32:06 -0400
2814 changes by Paul Eggert
2817 Release 2006m - 2006-10-02 15:32:35 -0400
2819 changes for Uruguay, Palestine, and Egypt by Paul Eggert
2821 (minimalist) changes to zic.8 to clarify "until" information
2824 Release data2006l - 2006-09-18 12:58:11 -0400
2826 Paul's best-effort work on this coming weekend's Egypt time change
2829 Release 2006k - 2006-08-28 12:19:09 -0400
2831 changes by Paul Eggert
2834 Release 2006j - 2006-08-21 09:56:32 -0400
2836 changes by Paul Eggert
2839 Release code2006i - 2006-08-07 12:30:55 -0400
2843 Ken Pizzini's conversion script
2846 Release code2006h - 2006-07-24 09:19:37 -0400
2848 adds public domain notices to four files
2850 includes a fix for transition times being off by a second
2852 adds a new recording to the "arts" file (information courtesy Colin Bowern)
2855 Release 2006g - 2006-05-08 17:18:09 -0400
2857 northamerica changes by Paul Eggert
2860 Release 2006f - 2006-05-01 11:46:00 -0400
2862 a missing version number problem is fixed (with thanks to Bradley
2863 White for catching the problem)
2866 Release 2006d - 2006-04-17 14:33:43 -0400
2868 changes by Paul Eggert
2870 added new items to tz-arts.htm that were found by Paul
2873 Release 2006c - 2006-04-03 10:09:32 -0400
2875 two sets of data changes by Paul Eggert
2877 a fencepost error fix in zic.c
2879 changes to zic.c and the "europe" file to minimize differences
2880 between output produced by the old 32-bit zic and the new 64-bit
2884 Release 2006b - 2006-02-20 10:08:18 -0500
2885 [tz32code2006b + tz64code2006b + tzdata2006b]
2889 All SCCS IDs were bumped to "8.1" for this release.
2892 Release 2006a - 2006-01-30 08:59:31 -0500
2894 changes by Paul Eggert (in particular, Indiana time zone moves)
2896 an addition to the zic manual page to describe how special-case
2897 transitions are handled
2900 Release 2005r - 2005-12-27 09:27:13 -0500
2902 Canadian changes by Paul Eggert
2904 They also add "<pre>" directives to time zone data files and reflect
2905 changes to warning message logic in "zdump.c" (but with calls to
2906 "gettext" kept unbundled at the suggestion of Ken Pizzini).
2909 Release 2005q - 2005-12-13 09:17:09 -0500
2911 Nothing earth-shaking here:
2912 1. Electronic mail addresses have been removed.
2913 2. Casts of the return value of exit have been removed.
2914 3. Casts of the argument of is.* macros have been added.
2915 4. Indentation in one section of zic.c has been fixed.
2916 5. References to dead URLs in the data files have been dealt with.
2919 Release 2005p - 2005-12-05 10:30:53 -0500
2921 "systemv", "tz-link.htm", and "zdump.c" changes
2922 (less the casts of arguments to the is* macros)
2925 Release 2005o - 2005-11-28 10:55:26 -0500
2927 Georgia, Cuba, Nicaragua, and Jordan changes by Paul Eggert
2929 zdump.c lint fixes by Arthur David Olson
2932 Release 2005n - 2005-10-03 09:44:09 -0400
2934 changes by Paul Eggert (both the Uruguay changes and the Kyrgyzstan
2938 Release 2005m - 2005-08-29 12:15:40 -0400
2940 changes by Paul Eggert (with a small tweak to the tz-art change)
2942 a declaration of an unused variable has been removed from zdump.c
2945 Release 2005l - 2005-08-22 12:06:39 -0400
2947 changes by Paul Eggert
2949 overflow/underflow checks by Arthur David Olson, minus changes to
2950 the "Theory" file about the pending addition of 64-bit data (I grow
2951 less confident of the changes being accepted with each passing day,
2952 and the changes no longer increase the data files nine-fold--there's
2953 less than a doubling in size by my local Sun's reckoning)
2956 Release 2005k - 2005-07-14 14:14:24 -0400
2958 The "leapseconds" file has been edited to reflect the recently
2959 announced leap second at the end of 2005.
2961 I've also deleted electronic mail addresses from the files as an
2965 Release 2005j - 2005-06-13 14:34:13 -0400
2967 These reflect changes to limit the length of time zone abbreviations
2968 and the characters used in those abbreviations.
2970 There are also changes to handle POSIX-style "quoted" time zone
2971 environment variables.
2973 The changes were circulated on the time zone mailing list; the only
2974 change since then was the removal of a couple of minimum-length of
2975 abbreviation checks.
2978 Release data2005i - 2005-04-21 15:04:16 -0400
2980 changes (most importantly to Nicaragua and Haiti) by Paul Eggert
2983 Release 2005h - 2005-04-04 11:24:47 -0400
2985 changes by Paul Eggert
2987 minor changes to Makefile and zdump.c to produce more useful output
2988 when doing a "make typecheck"
2991 Release 2005g - 2005-03-14 10:11:21 -0500
2993 changes by Paul Eggert (a change to current DST rules in Uruguay and
2994 an update to a link to time zone software)
2997 Release 2005f - 2005-03-01 08:45:32 -0500
2999 data and documentation changes by Paul Eggert
3002 Release 2005e - 2005-02-10 15:59:44 -0500
3007 Release code2005d - 2005-01-31 09:21:47 -0500
3009 make zic complain about links to links if the -v flag is used
3011 have "make public" do more code checking
3013 add an include to "localtime.c" for the benefit of gcc systems
3016 Release 2005c - 2005-01-17 18:36:29 -0500
3018 get better results when mktime runs on a system where time_t is double
3020 changes to the data files (most importantly to Paraguay)
3023 Release 2005b - 2005-01-10 09:19:54 -0500
3025 Get localtime and gmtime working on systems with exotic time_t types.
3027 Update the leap second commentary in the "leapseconds" file.
3030 Release 2005a - 2005-01-01 13:13:44 -0500
3035 Release code2004i - 2004-12-14 13:42:58 -0500
3037 Deal with systems where time_t is unsigned.
3040 Release code2004h - 2004-12-07 11:40:18 -0500
3042 64-bit-time_t changes
3045 Release 2004g - 2004-11-02 09:06:01 -0500
3047 update to Cuba (taking effect this weekend)
3049 other changes by Paul Eggert
3051 correction of the spelling of Oslo
3053 changed versions of difftime.c and private.h
3056 Release code2004f - 2004-10-21 10:25:22 -0400
3058 Cope with wide-ranging tm_year values.
3061 Release 2004e - 2004-10-11 14:47:21 -0400
3063 Brazil/Argentina/Israel changes by Paul Eggert
3065 changes to tz-link.htm by Paul
3067 one small fix to Makefile
3070 Release 2004d - 2004-09-22 08:27:29 -0400
3072 Avoid overflow problems when TM_YEAR_BASE is added to an integer.
3075 Release 2004c - 2004-08-11 12:06:26 -0400
3077 asctime-related changes
3079 (variants of) some of the documentation changes suggested by Paul Eggert
3082 Release 2004b - 2004-07-19 14:33:35 -0400
3084 data changes by Paul Eggert - most importantly, updates for Argentina
3087 Release 2004a - 2004-05-27 12:00:47 -0400
3089 changes by Paul Eggert
3091 Handle DST transitions that occur at the end of a month in some
3092 years but at the start of the following month in other years.
3094 Add a copy of the correspondence that's the basis for claims about
3095 DST in the Navajo Nation.
3098 Release 2003e - 2003-12-15 09:36:47 -0500
3100 changes by Arthur David Olson (primarily code changes)
3102 changes by Paul Eggert (primarily data changes)
3104 minor changes to "Makefile" and "northamerica" (in the latter case,
3105 optimization of the "Toronto" rules)
3108 Release 2003d - 2003-10-06 09:34:44 -0400
3110 changes by Paul Eggert
3113 Release 2003c - 2003-09-16 10:47:05 -0400
3115 Fix bad returns in zic.c's inleap function.
3116 Thanks to Bradley White for catching the problem!
3119 Release 2003b - 2003-09-16 07:13:44 -0400
3121 Add a "--version" option (and documentation) to the zic and zdump commands.
3123 changes to overflow/underflow checking in zic
3125 a localtime typo fix.
3127 Update the leapseconds and tz-art.htm files.
3130 Release 2003a - 2003-03-24 09:30:54 -0500
3132 changes by Paul Eggert
3134 a few additions and modifications to the tz-art.htm file
3137 Release 2002d - 2002-10-15 13:12:42 -0400
3139 changes by Paul Eggert, less the "Britain (UK)" change in iso3166.tab
3141 There's also a new time zone quote in "tz-art.htm".
3144 Release 2002c - 2002-04-04 11:55:20 -0500
3146 changes by Paul Eggert
3148 Change zic.c to avoid creating symlinks to files that don't exist.
3151 Release 2002b - 2002-01-28 12:56:03 -0500
3153 [These change notes are for Release 2002a, which was corrupted.
3154 2002b was a corrected version of 2002a.]
3156 changes by Paul Eggert
3158 Update the "leapseconds" file to note that there'll be no leap
3159 second at the end of June, 2002.
3161 Change "zic.c" to deal with a problem in handling the "Asia/Bishkek" zone.
3163 Change to "difftime.c" to avoid sizeof problems.
3166 Release 2001d - 2001-10-09 13:31:32 -0400
3168 changes by Paul Eggert
3171 Release 2001c - 2001-06-05 13:59:55 -0400
3173 changes by Paul Eggert and Andrew Brown
3176 Release 2001b - 2001-04-05 16:44:38 -0400
3178 changes by Paul Eggert (modulo jnorgard's typo fix)
3180 tz-art.htm has been HTMLified.
3183 Release 2001a - 2001-03-13 12:57:44 -0500
3185 changes by Paul Eggert
3187 An addition to the "leapseconds" file: comments with the text of the
3188 latest IERS leap second notice.
3190 Trailing white space has been removed from data file lines, and
3191 repeated spaces in "Rule Jordan" lines in the "asia" file have been
3195 Release 2000h - 2000-12-14 15:33:38 -0500
3197 changes by Paul Eggert
3199 one typo fix in the "art" file
3201 With providence, this is the last update of the millennium.
3204 Release 2000g - 2000-10-10 11:35:22 -0400
3206 changes by Paul Eggert
3208 correction of John Mackin's name submitted by Robert Elz
3210 Garry Shandling's Daylight Saving Time joke (!?!) from the recent
3211 Emmy Awards broadcast.
3214 Release 2000f - 2000-08-10 09:31:58 -0400
3216 changes by Paul Eggert
3218 Added information in "tz-art.htm" on a Seinfeld reference to DST.
3220 Error checking and messages in the "yearistype" script have been
3224 Release 2000e - 2000-07-31 09:27:54 -0400
3226 data changes by Paul Eggert
3228 a change to the default value of the defined constant HAVE_STRERROR
3230 the addition of a Dave Barry quote on DST to the tz-arts file
3233 Release 2000d - 2000-04-20 15:43:04 -0400
3235 changes to the documentation and code of strftime for C99 conformance
3237 a bug fix for date.c
3239 These are based on (though modified from) changes by Paul Eggert.
3242 Release 2000c - 2000-03-04 10:31:43 -0500
3244 changes by Paul Eggert
3247 Release 2000b - 2000-02-21 12:16:29 -0500
3249 changes by Paul Eggert and Joseph Myers
3251 modest tweaks to the tz-art.htm and tz-link.htm files
3254 Release 2000a - 2000-01-18 09:21:26 -0500
3256 changes by Paul Eggert
3258 The two hypertext documents have also been renamed.
3261 Release code1999i-data1999j - 1999-11-15 18:43:22 -0500
3263 Paul Eggert's changes
3265 additions to the "zic" manual page and the "Arts.htm" file
3268 Release code1999h-data1999i - 1999-11-08 14:55:21 -0500
3273 Release data1999h - 1999-10-07 03:50:29 -0400
3275 changes by Paul Eggert to "europe" (most importantly, fixing
3276 Lithuania and Estonia)
3279 Release 1999g - 1999-09-28 11:06:18 -0400
3281 data changes by Paul Eggert (most importantly, the change for
3282 Lebanon that buys correctness for this coming Sunday)
3284 The "code" file contains changes to "Makefile" and "checktab.awk" to
3285 allow better checking of time zone files before they are published.
3288 Release 1999f - 1999-09-23 09:48:14 -0400
3290 changes by Arthur David Olson and Paul Eggert
3293 Release 1999e - 1999-08-17 15:20:54 -0400
3295 changes circulated by Paul Eggert, although the change to handling
3296 of DST-specifying time zone names has been commented out for now
3297 (search for "XXX" in "localtime.c" for details). These files also
3298 do not make any changes to the start of DST in Brazil.
3300 In addition to Paul's changes, there are updates to "Arts.htm" and
3304 Release 1999d - 1999-03-30 11:31:07 -0500
3306 changes by Paul Eggert
3308 The Makefile's "make public" rule has also been changed to do a test
3309 compile of each individual time zone data file (which should help
3310 avoid problems such as the one we had with Nicosia).
3313 Release 1999c - 1999-03-25 09:47:47 -0500
3315 changes by Paul Eggert, most importantly the change for Chile.
3318 Release 1999b - 1999-02-01 17:51:44 -0500
3320 changes by Paul Eggert
3322 code changes (suggested by Mani Varadarajan, mani at be.com) for
3323 correct handling of symbolic links when building using a relative directory
3325 code changes to generate correct messages for failed links
3327 updates to the URLs in Arts.htm
3330 Release 1999a - 1999-01-19 16:20:29 -0500
3332 error message internationalizations and corrections in zic.c and
3333 zdump.c (as suggested by Vladimir Michl, vladimir.michl at upol.cz,
3337 Release code1998h-data1998i - 1998-10-01 09:56:10 -0400
3339 changes for Brazil, Chile, and Germany
3341 support for use of "24:00" in the input files for the time zone compiler
3344 Release code1998g-data1998h - 1998-09-24 10:50:28 -0400
3346 changes by Paul Eggert
3348 correction to a define in the "private.h" file
3351 Release data1998g - 1998-08-11 03:28:35 -0000
3352 [tzdata1998g.tar.gz is missing!]
3354 Lithuanian change provided by mgedmin at pub.osf.it
3356 Move creation of the GMT link with Etc/GMT to "etcetera" (from
3357 "backward") to ensure that the GMT file is created even where folks
3358 don't want the "backward" links (as suggested by Paul Eggert).
3361 Release data1998f - 1998-07-20 13:50:00 -0000
3362 [tzdata1998f.tar.gz is missing!]
3364 Update the "leapseconds" file to include the newly-announced
3365 insertion at the end of 1998.
3368 Release code1998f - 1998-06-01 10:18:31 -0400
3370 addition to localtime.c by Guy Harris
3373 Release 1998e - 1998-05-28 09:56:26 -0400
3375 The Makefile is changed to produce zoneinfo-posix rather than
3376 zoneinfo/posix, and to produce zoneinfo-leaps rather than
3379 data changes by Paul Eggert
3381 changes from Guy Harris to provide asctime_r and ctime_r
3383 A usno1998 file (substantially identical to usno1997) has been added.
3386 Release 1998d - 1998-05-14 11:58:34 -0400
3388 changes to comments (in particular, elimination of references to CIA maps).
3389 "Arts.htm", "WWW.htm", "asia", and "australasia" are the only places
3390 where changes occur.
3393 Release 1998c - 1998-02-28 12:32:26 -0500
3395 changes by Paul Eggert (save the "French correction," on which I'll
3396 wait for the dust to settle)
3400 changes and additions to Arts.htm
3403 Release 1998b - 1998-01-17 14:31:51 -0500
3405 URL cleanups and additions
3408 Release 1998a - 1998-01-13 12:37:35 -0500
3410 changes by Paul Eggert
3413 Release code1997i-data1997k - 1997-12-29 09:53:41 -0500
3415 changes by Paul Eggert, with minor modifications from Arthur David
3416 Olson to make the files more browser friendly
3419 Release code1997h-data1997j - 1997-12-18 17:47:35 -0500
3421 minor changes to put "TZif" at the start of each time zone information file
3423 a rule has also been added to the Makefile so you can
3425 to just recompile the zone information files (rather than doing a
3426 full "make install" with its other effects).
3429 Release data1997i - 1997-10-07 08:45:38 -0400
3431 changes to Africa by Paul Eggert
3434 Release code1997g-data1997h - 1997-09-04 16:56:54 -0400
3436 corrections for Uruguay (and other locations)
3438 Arthur David Olson's simple-minded fix allowing mktime to both
3439 correctly handle leap seconds and correctly handle tm_sec values
3440 upon which arithmetic has been performed.
3443 Release code1997f-data1997g - 1997-07-19 13:15:02 -0400
3445 Paul Eggert's updates
3447 a small change to a function prototype;
3449 "Music" has been renamed "Arts.htm", HTMLified, and augmented to
3450 include information on Around the World in Eighty Days.
3453 Release code1997e-data1997f - 1997-05-03 18:52:34 -0400
3455 fixes to zic's error handling
3457 changes inspired by the item circulated on Slovenia
3459 The description of Web resources has been HTMLified for browsing
3462 A new piece of tz-related music has been added to the "Music" file.
3465 Release code1997d-data1997e - 1997-03-29 12:48:52 -0500
3467 Paul Eggert's latest suggestions
3470 Release code1997c-data1997d - 1997-03-07 20:37:54 -0500
3472 changes to "zic.c" to correct performance of the "-s" option
3474 a new file "usno1997"
3477 Release data1997c - 1997-03-04 09:58:18 -0500
3482 Release 1997b - 1997-02-27 18:34:19 -0500
3484 The data file incorporates the 1997 leap second.
3486 The code file incorporates Arthur David Olson's take on the
3487 zic/multiprocessor/directory-creation situation.
3490 Release 1997a - 1997-01-21 09:11:10 -0500
3492 Paul Eggert's Antarctica (and other changes)
3494 Arthur David Olson finessed the "getopt" issue by checking against
3495 both -1 and EOF (regardless of POSIX, SunOS 4.1.1's manual says -1
3496 is returned while SunOS 5.5's manual says EOF is returned).
3499 Release code1996o-data1996n - 1996-12-27 21:42:05 -0500
3501 Paul Eggert's latest changes
3504 Release code1996n - 1996-12-16 09:42:02 -0500
3506 link snapping fix from Bruce Evans (via Garrett Wollman)
3509 Release data1996m - 1996-11-24 02:37:34 -0000
3510 [tzdata1996m.tar.gz is missing!]
3512 Paul Eggert's batch of changes
3515 Release code1996m-data1996l - 1996-11-05 14:00:12 -0500
3517 No functional changes here; the files have simply been changed to
3518 make more use of ISO style dates in comments. The names of the above
3519 files now include the year in full.
3522 Release code96l - 1996-09-08 17:12:20 -0400
3524 tzcode96k was missing a couple of pieces.
3527 Release 96k - 1996-09-08 16:06:22 -0400
3529 the latest round of changes from Paul Eggert
3531 the recent Year 2000 material
3534 Release code96j - 1996-07-30 13:18:53 -0400
3536 Set sp->typecnt as suggested by Timothy Patrick Murphy.
3539 Release code96i - 1996-07-27 20:11:35 -0400
3541 Paul's suggested patch for strftime %V week numbers
3544 Release data96i - 1996-07-01 18:13:04 -0400
3546 "northamerica" and "europe" changes by Paul Eggert
3549 Release code96h - 1996-06-05 08:02:21 -0400
3551 fix for handling transitions specified in Universal Time
3553 Some "public domain" notices have also been added.
3556 Release code96g - 1996-05-16 14:00:26 -0400
3558 fix for the simultaneous-DST-and-zone-change challenge
3561 Release data96h - 1996-05-09 17:40:51 -0400
3563 changes by Paul Eggert
3566 Release code96f-data96g - 1996-05-03 03:09:59 -0000
3567 [tzcode96f.tar.gz + tzdata96g.tar.gz are both missing!]
3569 The changes get us some of the way to fixing the problems noted in Paul
3570 Eggert's letter yesterday (in addition to a few others). The approach
3571 has been to make zic a bit smarter about figuring out what time zone
3572 abbreviations apply just after the time specified in the "UNTIL" part
3573 of a zone line. Putting the smarts in zic means avoiding having
3574 transition times show up in both "Zone" lines and "Rule" lines, which
3575 in turn avoids multiple transition time entries in time zone files.
3576 (This also makes the zic input files such as "europe" a bit shorter and
3577 should ease maintenance.)
3580 Release data96f - 1996-04-19 19:20:03 -0000
3581 [tzdata96f.tar.gz is missing!]
3583 The only changes are to the "northamerica" file; the time zone
3584 abbreviation for Denver is corrected to MST (and MDT), and the
3585 comments for Mexico have been updated.
3588 Release data96e - 1996-03-19 17:37:26 -0500
3590 Proposals by Paul Eggert, in particular the Portugal change that
3591 comes into play at the end of this month.
3594 Release data96d - 1996-03-18 20:49:39 -0500
3599 Release code96e - 1996-02-29 15:43:27 -0000
3600 [tzcode96e.tar.gz is missing!]
3602 internationalization changes and the fix to the documentation for strftime
3605 Release code96d-data96c - 1996-02-12 11:05:27 -0500
3607 The "code" file simply updates Bob Kridle's electronic address.
3609 The "data" file updates rules for Mexico.
3612 Release data96b - 1996-01-27 15:44:42 -0500
3617 Release code96c - 1996-01-16 16:58:15 -0500
3619 leap-year streamlining and binary-search changes
3624 Release code96b - 1996-01-10 20:42:39 -0500
3626 fixes and enhancements from Paul Eggert, including code that
3627 emulates the behavior of recent versions of the SunOS "date"
3631 Release 96a - 1996-01-06 09:08:24 -0500
3635 fixes to strftime.c for correct ISO 8601 week number generation,
3636 plus support for two new formats ('G' and 'g') to give ISO 8601 year
3637 numbers (which are not necessarily the same as calendar year numbers)
3640 Release code95i-data95m - 1995-12-21 12:46:47 -0500
3642 The latest revisions from Paul Eggert are included, the usno1995
3643 file has been updated, and a new file ("WWW") covering useful URLs
3647 Release code95h-data95l - 1995-12-19 18:10:12 -0500
3649 A simplification of a macro definition, a change to data for Sudan,
3650 and (for last minute shoppers) notes in the "Music" file on the CD
3654 Release code95g-data95k - 1995-10-30 10:32:47 -0500
3656 (slightly reformatted) 8-bit-clean proposed patch
3658 minor patch: US/Eastern -> America/New_York
3660 snapshot of the USNO's latest data ("usno1995")
3662 some other minor cleanups
3665 Release code95f-data95j - 1995-10-28 21:01:34 -0000
3666 [tzcode95f.tar.gz + tzdata95j.tar.gz are both missing!]
3670 support for 64-bit time_t's
3672 optimization in localtime.c
3675 Release code95e - 1995-10-13 13:23:57 -0400
3677 the mktime change to scan from future to past when trying to find time zone
3681 Release data95i - 1995-09-26 10:43:26 -0400
3683 For Canada/Central, guess that the Sun customer's "one week too
3684 early" was just a approximation, and the true error is one month
3685 too early. This is consistent with the rest of Canada.
3688 Release data95h - 1995-09-21 11:26:48 -0400
3690 latest changes from Paul Eggert
3693 Release code95d - 1995-09-14 11:14:45 -0400
3695 the addition of a "Music" file, which documents four recorded
3696 versions of the tune "Save That Time".
3699 Release data95g - 1995-09-01 17:21:36 -0400
3701 "yearistype" correction
3704 Release data95f - 1995-08-28 20:46:56 -0400
3706 Paul Eggert's change to the australasia file
3709 Release data95e - 1995-07-08 18:02:34 -0400
3711 The only change is a leap second at the end of this year.
3712 Thanks to Bradley White for forwarding news on the leap second.
3715 Release data95d - 1995-07-03 13:26:22 -0400
3717 Paul Eggert's changes
3720 Release data95c - 1995-07-02 19:19:28 -0400
3722 changes to "asia", "backward", "europe", and "southamerica"
3723 (read: northamericacentrics need not apply)
3726 Release code95c - 1995-03-13 14:00:46 -0500
3728 one-line fix for sign extension problems in detzcode
3731 Release 95b - 1995-03-04 11:22:38 -0500
3733 Minor changes in both:
3735 The "code" file contains a workaround for the lack of "unistd.h" in
3736 Microsoft C++ version 7.
3738 The "data" file contains a fixed "Link" for America/Shiprock.
3741 Release 94h - 1994-12-10 12:51:14 -0500
3745 * incorporate the changes to "zdump" and "date" to make changes to
3746 the "TZ" environment variable permanent;
3748 * incorporate the table changes by Paul Eggert;
3750 * include (and document) support for universal time specifications in
3751 data files - but do not (yet) include use of this feature in the
3754 Think of this as "TZ Classic" - the software has been set up not to break if
3755 universal time shows up in its input, and data entries have been
3756 left as is so as not to break existing implementations.
3759 Release data94f - 1994-08-20 12:56:09 -0400
3761 (with thanks!) the latest data updates from Paul Eggert
3764 Release data94e - 1994-06-04 13:13:53 -0400
3769 Release code94g - 1994-05-05 12:14:07 -0400
3771 fix missing "optind.c" and a reference to it in the Makefile
3774 Release code94f - 1994-05-05 13:00:33 -0000
3775 [tzcode94f.tar.gz is missing!]
3777 changes to avoid overflow in difftime, as well as changes to cope
3778 with the 52/53 challenge in strftime
3781 Release code94e - 1994-03-30 23:32:59 -0500
3783 change for the benefit of PCTS
3786 Release 94d - 1994-02-24 15:42:25 -0500
3788 Avoid clashes with POSIX semantics for zones such as GMT+4.
3790 Some other very minor housekeeping is also present.
3793 Release code94c - 1994-02-10 08:52:40 -0500
3795 Fix bug where mkdirs was broken unless you compile with
3796 -fwritable-strings (which is generally losing to do).
3799 Release 94b - 1994-02-07 10:04:33 -0500
3801 work by Paul Eggert who notes:
3803 I found another book of time zone histories by E W Whitman; it's not
3804 as extensive as Shanks but has a few goodies of its own. I used it
3805 to update the tables. I also fixed some more as a result of
3806 correspondence with Adam David and Peter Ilieve, and move some stray
3807 links from 'europe' to 'backward'. I corrected some scanning errors
3810 As far as the code goes, I fixed zic to allow years in the range
3811 INT_MIN to INT_MAX; this fixed a few boundary conditions around 1900.
3812 And I cleaned up the zic documentation a little bit.
3815 Release data94a - 1994-02-03 08:58:54 -0500
3817 It simply incorporates the recently announced leap second into the
3821 Release 93g - 1993-11-22 17:28:27 -0500
3823 Paul Eggert has provided a good deal of historic information (based
3824 on Shanks), and there are some code changes to deal with the buglets
3825 that crawled out in dealing with the new information.
3828 Release 93f - 1993-10-15 12:27:46 -0400
3830 Paul Eggert's changes
3833 Release 93e - 1993-09-05 21:21:44 -0400
3835 This has updated data for Israel, England, and Kwajalein. There's
3836 also an update to "zdump" to cope with Kwajalein's 24-hour jump.
3837 Thanks to Paul Eggert and Peter Ilieve for the changes.
3840 Release 93d - 1993-06-17 23:34:17 -0400
3842 new fix and new data on Israel
3845 Release 93c - 1993-06-06 19:31:55 -0400
3850 Release 93b - 1993-02-02 14:53:58 -0500
3852 updated "leapseconds" file
3855 Release 93 - 1993-01-08 07:01:06 -0500
3857 At kre's suggestion, the package has been split in two - a code piece
3858 (which also includes documentation) that's only of use to folks who
3859 want to recompile things and a data piece useful to anyone who can
3862 The new version has a few changes to the data files, a few
3863 portability changes, and an off-by-one fix (with thanks to
3864 Tom Karzes at deshaw.com for providing a description and a
3868 Release 92c - 1992-11-21 17:35:36 -0000
3869 [tz92c.tar.Z is missing!]
3871 The fallout from the latest round of DST transitions.
3873 There are changes for Portugal, Saskatchewan, and "Pacific-New";
3874 there's also a change to "zic.c" that makes it portable to more systems.
3877 Release 92 - 1992-04-25 18:17:03 -0000
3878 [tz92.tar.Z is missing!]
3880 By popular demand (well, at any rate, following a request by kre at munnari)
3883 The 1989 update of the time zone package featured:
3885 * POSIXization (including interpretation of POSIX-style TZ environment
3886 variables, provided by Guy Harris),
3887 * ANSIfication (including versions of "mktime" and "difftime"),
3888 * SVIDulation (an "altzone" variable)
3889 * MACHination (the "gtime" function)
3890 * corrections to some time zone data (including corrections to the rules
3891 for Great Britain and New Zealand)
3892 * reference data from the United States Naval Observatory for folks who
3893 want to do additional time zones
3894 * and the 1989 data for Saudi Arabia.
3896 (Since this code will be treated as "part of the implementation" in some
3897 places and as "part of the application" in others, there's no good way to
3898 name functions, such as timegm, that are not part of the proposed ANSI C
3899 standard; such functions have kept their old, underscore-free names in this
3902 And the "dysize" function has disappeared; it was present to allow
3903 compilation of the "date" command on old BSD systems, and a version of "date"
3904 is now provided in the package. The "date" command is not created when you
3905 "make all" since it may lack options provided by the version distributed with
3906 your operating system, or may not interact with the system in the same way
3907 the native version does.
3909 Since POSIX frowns on correct leap second handling, the default behavior of
3910 the "zic" command (in the absence of a "-L" option) has been changed to omit
3911 leap second information from its output files.
3917 This file contains copies of the part of each release announcement
3918 that talks about the changes in that release. The text has been
3919 adapted and reformatted for the purposes of this file.
3921 Traditionally a release R consists of a pair of tarball files,
3922 tzcodeR.tar.gz and tzdataR.tar.gz. However, some releases (e.g.,
3923 code2010a, data2012c) consist of just one or the other tarball, and a
3924 few (e.g., code2012c-data2012d) have tarballs with mixed version
3925 numbers. Recent releases also come in an experimental format
3926 consisting of a single tarball tzdb-R.tar.lz with extra data.
3928 Release timestamps are taken from the release's commit (for newer,
3929 Git-based releases), from the newest file in the tarball (for older
3930 releases, where this info is available) or from the email announcing
3931 the release (if all else fails; these are marked with a time zone of
3932 -0000 and an "is missing!" comment).
3934 Earlier versions of the code and data were not announced on the tz
3935 list and are not summarized here.
3937 This file is in the public domain.