1 News for the tz database
3 Release 2016b - 2016-03-12 17:30:14 -0800
5 Changes affecting future time stamps
7 New zones Europe/Astrakhan and Europe/Ulyanovsk for Astrakhan and
8 Ulyanovsk Oblasts, Russia, both of which will switch from +03 to +04 on
9 2016-03-27 at 02:00 local time. They need distinct zones since their
10 post-1970 histories disagree. New zone Asia/Barnaul for Altai Krai and
11 Altai Republic, Russia, which will switch from +06 to +07 on the same date
12 and local time. The Astrakhan change is already official; the others have
13 passed the first reading in the State Duma and are extremely likely.
14 Also, Asia/Sakhalin moves from +10 to +11 on 2016-03-27 at 02:00.
15 (Thanks to Alexander Krivenyshev for the heads-up, and to Matt Johnson
16 and Stepan Golosunov for followup.)
18 As a trial of a new system that needs less information to be made up,
19 the new zones use numeric time zone abbreviations like "+04"
20 instead of invented abbreviations like "ASTT".
22 Haiti will not observe DST in 2016. (Thanks to Jean Antoine via
25 Palestine's spring-forward transition on 2016-03-26 is at 01:00, not 00:00.
26 (Thanks to Hannah Kreitem.) Guess future transitions will be March's last
27 Saturday at 01:00, not March's last Friday at 24:00.
29 Changes affecting past time stamps
31 Europe/Chisinau observed DST during 1990, and switched from +04 to
32 +03 at 1990-05-06 02:00, instead of switching from +03 to +02.
33 (Thanks to Stepan Golosunov.)
35 1991 abbreviations in Europe/Samara should be SAMT/SAMST, not
36 KUYT/KUYST. (Thanks to Stepan Golosunov.)
40 tzselect's diagnostics and checking, and checktab.awk's checking,
41 have been improved. (Thanks to J William Piggott.)
43 tzcode now builds under MinGW. (Thanks to Ian Abbott and Esben Haabendal.)
45 tzselect now tests Julian-date TZ settings more accurately.
46 (Thanks to J William Piggott.)
50 Comments in zone tables have been improved. (Thanks to J William Piggott.)
52 tzselect again limits its menu comments so that menus fit on a
53 24x80 alphanumeric display.
55 A new web page tz-how-to.html. (Thanks to Bill Seymour.)
57 In the Theory file, the description of possible time zone abbreviations in
58 tzdata has been cleaned up, as the old description was unclear and
59 inconsistent. (Thanks to Alain Mouette for reporting the problem.)
62 Release 2016a - 2016-01-26 23:28:02 -0800
64 Changes affecting future time stamps
66 America/Cayman will not observe daylight saving this year after all.
67 Revert our guess that it would. (Thanks to Matt Johnson.)
69 Asia/Chita switches from +0800 to +0900 on 2016-03-27 at 02:00.
70 (Thanks to Alexander Krivenyshev.)
72 Asia/Tehran now has DST predictions for the year 2038 and later,
73 to be March 21 00:00 to September 21 00:00. This is likely better
74 than predicting no DST, albeit off by a day every now and then.
76 Changes affecting past and future time stamps
78 America/Metlakatla switched from PST all year to AKST/AKDT on
79 2015-11-01 at 02:00. (Thanks to Steffen Thorsen.)
81 America/Santa_Isabel has been removed, and replaced with a
82 backward compatibility link to America/Tijuana. Its contents were
83 apparently based on a misreading of Mexican legislation.
85 Changes affecting past time stamps
87 Asia/Karachi's two transition times in 2002 were off by a minute.
88 (Thanks to Matt Johnson.)
90 Changes affecting build procedure
92 An installer can now combine leap seconds with use of the backzone file,
93 e.g., with 'make PACKRATDATA=backzone REDO=posix_right zones'.
94 The old 'make posix_packrat' rule is now marked as obsolescent.
95 (Thanks to Ian Abbott for an initial implementation.)
97 Changes affecting documentation and commentary
99 A new file LICENSE makes it easier to see that the code and data
100 are mostly public-domain. (Thanks to James Knight.) The three
101 non-public-domain files now use the current (3-clause) BSD license
102 instead of older versions of that license.
104 tz-link.htm mentions the BDE library (thanks to Andrew Paprocki),
105 CCTZ (thanks to Tim Parenti), TimeJones.com, and has a new section
106 on editing tz source files (with a mention of Sublime zoneinfo,
107 thanks to Gilmore Davidson).
109 The Theory and asia files now mention the 2015 book "The Global
110 Transformation of Time, 1870-1950", and cite a couple of reviews.
112 The America/Chicago entry now documents the informal use of US
113 central time in Fort Pierre, South Dakota. (Thanks to Rick
114 McDermid, Matt Johnson, and Steve Jones.)
117 Release 2015g - 2015-10-01 00:39:51 -0700
119 Changes affecting future time stamps
121 Turkey's 2015 fall-back transition is scheduled for Nov. 8, not Oct. 25.
124 Norfolk moves from +1130 to +1100 on 2015-10-04 at 02:00 local time.
125 (Thanks to Alexander Krivenyshev.)
127 Fiji's 2016 fall-back transition is scheduled for January 17, not 24.
128 (Thanks to Ken Rylander.)
130 Fort Nelson, British Columbia will not fall back on 2015-11-01. It has
131 effectively been on MST (-0700) since it advanced its clocks on 2015-03-08.
132 New zone America/Fort_Nelson. (Thanks to Matt Johnson.)
134 Changes affecting past time stamps
136 Norfolk observed DST from 1974-10-27 02:00 to 1975-03-02 02:00.
138 Changes affecting code
140 localtime no longer mishandles America/Anchorage after 2037.
141 (Thanks to Bradley White for reporting the bug.)
143 On hosts with signed 32-bit time_t, localtime no longer mishandles
144 Pacific/Fiji after 2038-01-16 14:00 UTC.
146 The localtime module allows the variables 'timezone', 'daylight',
147 and 'altzone' to be in common storage shared with other modules,
148 and declares them in case the system <time.h> does not.
149 (Problems reported by Kees Dekker.)
151 On platforms with tm_zone, strftime.c now assumes it is not NULL.
152 This simplifies the code and is consistent with zdump.c.
153 (Problem reported by Christos Zoulas.)
155 Changes affecting documentation
157 The tzfile man page now documents that transition times denote the
158 starts (not the ends) of the corresponding time periods.
159 (Ambiguity reported by Bill Seymour.)
162 Release 2015f - 2015-08-10 18:06:56 -0700
164 Changes affecting future time stamps
166 North Korea switches to +0830 on 2015-08-15. (Thanks to Steffen Thorsen.)
167 The abbreviation remains "KST". (Thanks to Robert Elz.)
169 Uruguay no longer observes DST. (Thanks to Steffen Thorsen
172 Changes affecting past and future time stamps
174 Moldova starts and ends DST at 00:00 UTC, not at 01:00 UTC.
175 (Thanks to Roman Tudos.)
177 Changes affecting data format and code
179 zic's '-y YEARISTYPE' option is no longer documented. The TYPE
180 field of a Rule line should now be '-'; the old values 'even',
181 'odd', 'uspres', 'nonpres', 'nonuspres' were already undocumented.
182 Although the implementation has not changed, these features do not
183 work in the default installation, they are not used in the data,
184 and they are now considered obsolescent.
186 zic now checks that two rules don't take effect at the same time.
187 (Thanks to Jon Skeet and Arthur David Olson.) Constraints on
188 simultaneity are now documented.
190 The two characters '%z' in a zone format now stand for the UTC
191 offset, e.g., '-07' for seven hours behind UTC and '+0530' for
192 five hours and thirty minutes ahead. This better supports time
193 zone abbreviations conforming to POSIX.1-2001 and later.
195 Changes affecting installed data files
197 Comments for America/Halifax and America/Glace_Bay have been improved.
198 (Thanks to Brian Inglis.)
200 Data entries have been simplified for Atlantic/Canary, Europe/Simferopol,
201 Europe/Sofia, and Europe/Tallinn. This yields slightly smaller
202 installed data files for Europe/Simferopol and Europe/Tallinn.
203 It does not affect timestamps. (Thanks to Howard Hinnant.)
205 Changes affecting code
207 zdump and zic no longer warn about valid time zone abbreviations
210 Some Visual Studio 2013 warnings have been suppressed.
211 (Thanks to Kees Dekker.)
213 'date' no longer sets the time of day and its -a, -d, -n and -t
214 options have been removed. Long obsolescent, the implementation
215 of these features had porting problems. Builders no longer need
216 to configure HAVE_ADJTIME, HAVE_SETTIMEOFDAY, or HAVE_UTMPX_H.
217 (Thanks to Kees Dekker for pointing out the problem.)
219 Changes affecting documentation
221 The Theory file mentions naming issues earlier, as these seem to be
222 poorly publicized (thanks to Gilmore Davidson for reporting the problem).
224 tz-link.htm mentions Time Zone Database Parser (thanks to Howard Hinnant).
226 Mention that Herbert Samuel introduced the term "Summer Time".
229 Release 2015e - 2015-06-13 10:56:02 -0700
231 Changes affecting future time stamps
233 Morocco will suspend DST from 2015-06-14 03:00 through 2015-07-19 02:00,
234 not 06-13 and 07-18 as we had guessed. (Thanks to Milamber.)
236 Assume Cayman Islands will observe DST starting next year, using US rules.
237 Although it isn't guaranteed, it is the most likely.
239 Changes affecting data format
241 The file 'iso3166.tab' now uses UTF-8, so that its entries can better
242 spell the names of Åland Islands, Côte d'Ivoire, and Réunion.
244 Changes affecting code
246 When displaying data, tzselect converts it to the current locale's
247 encoding if the iconv command works. (Problem reported by random832.)
249 tzselect no longer mishandles Dominica, fixing a bug introduced
250 in Release 2014f. (Problem reported by Owen Leibman.)
252 zic -l no longer fails when compiled with -DTZDEFAULT=\"/etc/localtime\".
253 This fixes a bug introduced in Release 2014f.
254 (Problem reported by Leonardo Chiquitto.)
257 Release 2015d - 2015-04-24 08:09:46 -0700
259 Changes affecting future time stamps
261 Egypt will not observe DST in 2015 and will consider canceling it
262 permanently. For now, assume no DST indefinitely.
263 (Thanks to Ahmed Nazmy and Tim Parenti.)
265 Changes affecting past time stamps
267 America/Whitehorse switched from UTC-9 to UTC-8 on 1967-05-28, not
268 1966-07-01. Also, Yukon's time zone history is documented better.
269 (Thanks to Brian Inglis and Dennis Ferguson.)
271 Change affecting past and future time zone abbreviations
273 The abbreviations for Hawaii-Aleutian standard and daylight times
274 have been changed from HAST/HADT to HST/HDT, as per US Government
275 Printing Office style. This affects only America/Adak since 1983,
276 as America/Honolulu was already using the new style.
278 Changes affecting code
280 zic has some minor performance improvements.
283 Release 2015c - 2015-04-11 08:55:55 -0700
285 Changes affecting future time stamps
287 Egypt's spring-forward transition is at 24:00 on April's last Thursday,
288 not 00:00 on April's last Friday. 2015's transition will therefore be on
289 Thursday, April 30 at 24:00, not Friday, April 24 at 00:00. Similar fixes
290 apply to 2026, 2037, 2043, etc. (Thanks to Steffen Thorsen.)
292 Changes affecting past time stamps
294 The following changes affect some pre-1991 Chile-related time stamps
295 in America/Santiago, Antarctica/Palmer, and Pacific/Easter.
297 The 1910 transition was January 10, not January 1.
299 The 1918 transition was September 10, not September 1.
301 The UTC-4 time observed from 1932 to 1942 is now considered to be
302 standard time, not year-round DST.
304 Santiago observed DST (UTC-3) from 1946-07-15 through 1946-08-31,
305 then reverted to standard time, then switched its time zone to
308 Assume transitions before 1968 were at 00:00, since we have no data
311 The spring 1988 transition was 1988-10-09, not 1988-10-02.
312 The fall 1990 transition was 1990-03-11, not 1990-03-18.
314 Assume no UTC offset change for Pacific/Easter on 1890-01-01,
315 and omit all transitions on Pacific/Easter from 1942 through 1946
316 since we have no data suggesting that they existed.
318 One more zone has been turned into a link, as it differed
319 from an existing zone only for older time stamps. As usual,
320 this change affects UTC offsets in pre-1970 time stamps only.
321 The zone's old contents have been moved to the 'backzone' file.
322 The affected zone is America/Montreal.
324 Changes affecting commentary
326 Mention the TZUpdater tool.
328 Mention "The Time Now". (Thanks to Brandon Ramsey.)
331 Release 2015b - 2015-03-19 23:28:11 -0700
333 Changes affecting future time stamps
335 Mongolia will start observing DST again this year, from the last
336 Saturday in March at 02:00 to the last Saturday in September at 00:00.
337 (Thanks to Ganbold Tsagaankhuu.)
339 Palestine will start DST on March 28, not March 27. Also,
340 correct the fall 2014 transition from September 26 to October 24.
341 Adjust future predictions accordingly. (Thanks to Steffen Thorsen.)
343 Changes affecting past time stamps
345 The 1982 zone shift in Pacific/Easter has been corrected, fixing a 2015a
346 regression. (Thanks to Stuart Bishop for reporting the problem.)
348 Some more zones have been turned into links, when they differed
349 from existing zones only for older time stamps. As usual,
350 these changes affect UTC offsets in pre-1970 time stamps only.
351 Their old contents have been moved to the 'backzone' file.
352 The affected zones are: America/Antigua, America/Cayman,
353 Pacific/Midway, and Pacific/Saipan.
355 Changes affecting time zone abbreviations
357 Correct the 1992-2010 DST abbreviation in Volgograd from "MSK" to "MSD".
360 Changes affecting code
362 Fix integer overflow bug in reference 'mktime' implementation.
363 (Problem reported by Jörg Richter.)
365 Allow -Dtime_tz=time_t compilations, and allow -Dtime_tz=... libraries
366 to be used in the same executable as standard-library time_t functions.
367 (Problems reported by Bradley White.)
369 Changes affecting commentary
371 Cite the recent Mexican decree changing Quintana Roo's time zone.
372 (Thanks to Carlos Raúl Perasso.)
374 Likewise for the recent Chilean decree. (Thanks to Eduardo Romero Urra.)
376 Update info about Mars time.
379 Release 2015a - 2015-01-29 22:35:20 -0800
381 Changes affecting future time stamps
383 The Mexican state of Quintana Roo, represented by America/Cancun,
384 will shift from Central Time with DST to Eastern Time without DST
385 on 2015-02-01 at 02:00. (Thanks to Steffen Thorsen and Gwillim Law.)
387 Chile will not change clocks in April or thereafter; its new standard time
388 will be its old daylight saving time. This affects America/Santiago,
389 Pacific/Easter, and Antarctica/Palmer. (Thanks to Juan Correa.)
391 New leap second 2015-06-30 23:59:60 UTC as per IERS Bulletin C 49.
392 (Thanks to Tim Parenti.)
394 Changes affecting past time stamps
396 Iceland observed DST in 1919 and 1921, and its 1939 fallback
397 transition was Oct. 29, not Nov. 29. Remove incorrect data from
398 Shanks about time in Iceland between 1837 and 1908.
400 Some more zones have been turned into links, when they differed
401 from existing zones only for older time stamps. As usual,
402 these changes affect UTC offsets in pre-1970 time stamps only.
403 Their old contents have been moved to the 'backzone' file.
404 The affected zones are: Asia/Aden, Asia/Bahrain, Asia/Kuwait,
407 Changes affecting code
409 tzalloc now scrubs time zone abbreviations compatibly with the way
410 that tzset always has, by replacing invalid bytes with '_' and by
411 shortening too-long abbreviations.
413 tzselect ports to POSIX awk implementations, no longer mishandles
414 POSIX TZ settings when GNU awk is used, and reports POSIX TZ
415 settings to the user. (Thanks to Stefan Kuhn.)
417 Changes affecting build procedure
419 'make check' now checks for links to links in the data.
420 One such link (for Africa/Asmera) has been fixed.
421 (Thanks to Stephen Colebourne for pointing out the problem.)
423 Changes affecting commentary
425 The leapseconds file commentary now mentions the expiration date.
426 (Problem reported by Martin Burnicki.)
428 Update Mexican Library of Congress URL.
431 Release 2014j - 2014-11-10 17:37:11 -0800
433 Changes affecting current and future time stamps
435 Turks & Caicos' switch from US eastern time to UTC-4 year-round
436 did not occur on 2014-11-02 at 02:00. It's currently scheduled
437 for 2015-11-01 at 02:00. (Thanks to Chris Walton.)
439 Changes affecting past time stamps
441 Many pre-1989 time stamps have been corrected for Asia/Seoul and
442 Asia/Pyongyang, based on sources for the Korean-language Wikipedia
443 entry for time in Korea. (Thanks to Sanghyuk Jung.) Also, no
444 longer guess that Pyongyang mimicked Seoul time after World War II,
445 as this is politically implausible.
447 Some more zones have been turned into links, when they differed
448 from existing zones only for older time stamps. As usual,
449 these changes affect UTC offsets in pre-1970 time stamps only.
450 Their old contents have been moved to the 'backzone' file.
451 The affected zones are: Africa/Addis_Ababa, Africa/Asmara,
452 Africa/Dar_es_Salaam, Africa/Djibouti, Africa/Kampala,
453 Africa/Mogadishu, Indian/Antananarivo, Indian/Comoro, and
456 Changes affecting commentary
458 The commentary is less enthusiastic about Shanks as a source,
459 and is more careful to distinguish UT from UTC.
462 Release 2014i - 2014-10-21 22:04:57 -0700
464 Changes affecting future time stamps
466 Pacific/Fiji will observe DST from 2014-11-02 02:00 to 2015-01-18 03:00.
467 (Thanks to Ken Rylander for the heads-up.) Guess that future
468 years will use a similar pattern.
470 A new Zone Pacific/Bougainville, for the part of Papua New Guinea
471 that plans to switch from UTC+10 to UTC+11 on 2014-12-28 at 02:00.
472 (Thanks to Kiley Walbom for the heads-up.)
474 Changes affecting time zone abbreviations
476 Since Belarus is not changing its clocks even though Moscow is,
477 the time zone abbreviation in Europe/Minsk is changing from FET
478 to its more-traditional value MSK on 2014-10-26 at 01:00.
479 (Thanks to Alexander Bokovoy for the heads-up about Belarus.)
481 The new abbreviation IDT stands for the pre-1976 use of UT+8 in
482 Indochina, to distinguish it better from ICT (UT+7).
484 Changes affecting past time stamps
486 Many time stamps have been corrected for Asia/Ho_Chi_Minh before 1976
487 (thanks to Trần Ngọc Quân for an indirect pointer to Trần Tiến Bình's
488 authoritative book). Asia/Ho_Chi_Minh has been added to
489 zone1970.tab, to give tzselect users in Vietnam two choices,
490 since north and south Vietnam disagreed after our 1970 cutoff.
492 Asia/Phnom_Penh and Asia/Vientiane have been turned into links, as
493 they differed from existing zones only for older time stamps. As
494 usual, these changes affect pre-1970 time stamps only. Their old
495 contents have been moved to the 'backzone' file.
497 Changes affecting code
499 The time-related library functions now set errno on failure, and
500 some crashes in the new tzalloc-related library functions have
501 been fixed. (Thanks to Christos Zoulas for reporting most of
502 these problems and for suggesting fixes.)
504 If USG_COMPAT is defined and the requested time stamp is standard time,
505 the tz library's localtime and mktime functions now set the extern
506 variable timezone to a value appropriate for that time stamp; and
507 similarly for ALTZONE, daylight saving time, and the altzone variable.
508 This change is a companion to the tzname change in 2014h, and is
509 designed to make timezone and altzone more compatible with tzname.
511 The tz library's functions now set errno to EOVERFLOW if they fail
512 because the result cannot be represented. ctime and ctime_r now
513 return NULL and set errno when a time stamp is out of range, rather
514 than having undefined behavior.
516 Some bugs associated with the new 2014g functions have been fixed.
517 This includes a bug that largely incapacitated the new functions
518 time2posix_z and posix2time_z. (Thanks to Christos Zoulas.)
519 It also includes some uses of uninitialized variables after tzalloc.
520 The new code uses the standard type 'ssize_t', which the Makefile
521 now gives porting advice about.
523 Changes affecting commentary
525 Updated URLs for NRC Canada (thanks to Matt Johnson and Brian Inglis).
528 Release 2014h - 2014-09-25 18:59:03 -0700
530 Changes affecting past time stamps
532 America/Jamaica's 1974 spring-forward transition was Jan. 6, not Apr. 28.
534 Shanks says Asia/Novokuznetsk switched from LMT (not "NMT") on 1924-05-01,
535 not 1920-01-06. The old entry was based on a misinterpretation of Shanks.
537 Some more zones have been turned into links, when they differed
538 from existing zones only for older time stamps. As usual,
539 these changes affect UTC offsets in pre-1970 time stamps only.
540 Their old contents have been moved to the 'backzone' file.
541 The affected zones are: Africa/Blantyre, Africa/Bujumbura,
542 Africa/Gaborone, Africa/Harare, Africa/Kigali, Africa/Lubumbashi,
543 Africa/Lusaka, Africa/Maseru, and Africa/Mbabane.
545 Changes affecting code
547 zdump -V and -v now output gmtoff= values on all platforms,
548 not merely on platforms defining TM_GMTOFF.
550 The tz library's localtime and mktime functions now set tzname to a value
551 appropriate for the requested time stamp, and zdump now uses this
552 on platforms not defining TM_ZONE, fixing a 2014g regression.
553 (Thanks to Tim Parenti for reporting the problem.)
555 The tz library no longer sets tzname if localtime or mktime fails.
557 zdump -c no longer mishandles transitions near year boundaries.
558 (Thanks to Tim Parenti for reporting the problem.)
560 An access to uninitalized data has been fixed.
561 (Thanks to Jörg Richter for reporting the problem.)
563 When THREAD_SAFE is defined, the code ports to the C11 memory model.
564 A memory leak has been fixed if ALL_STATE and THREAD_SAFE are defined
565 and two threads race to initialize data used by gmtime-like functions.
566 (Thanks to Andy Heninger for reporting the problems.)
568 Changes affecting build procedure
570 'make check' now checks better for properly-sorted data.
572 Changes affecting documentation and commentary
574 zdump's gmtoff=N output is now documented, and its isdst=D output
575 is now documented to possibly output D values other than 0 or 1.
577 zdump -c's treatment of years is now documented to use the
578 Gregorian calendar and Universal Time without leap seconds,
579 and its behavior at cutoff boundaries is now documented better.
580 (Thanks to Arthur David Olson and Tim Parenti for reporting the problems.)
582 Programs are now documented to use the proleptic Gregorian calendar.
583 (Thanks to Alan Barrett for the suggestion.)
585 Fractional-second GMT offsets have been documented for civil time
586 in 19th-century Chennai, Jakarta, and New York.
589 Release 2014g - 2014-08-28 12:31:23 -0700
591 Changes affecting future time stamps
593 Turks & Caicos is switching from US eastern time to UTC-4 year-round,
594 modeled as a switch from EST/EDT to AST on 2014-11-02 at 02:00.
595 [As noted in 2014j, this switch was later delayed.]
597 Changes affecting past time stamps
599 Time in Russia or the USSR before 1926 or so has been corrected by
600 a few seconds in the following zones: Asia/Irkutsk,
601 Asia/Krasnoyarsk, Asia/Omsk, Asia/Samarkand, Asia/Tbilisi,
602 Asia/Vladivostok, Asia/Yakutsk, Europe/Riga, Europe/Samara. For
603 Asia/Yekaterinburg the correction is a few minutes. (Thanks to
606 The Portuguese decree of 1911-05-26 took effect on 1912-01-01.
607 This affects 1911 time stamps in Africa/Bissau, Africa/Luanda,
608 Atlantic/Azores, and Atlantic/Madeira. Also, Lisbon's pre-1912
609 GMT offset was -0:36:45 (rounded from -0:36:44.68), not -0:36:32.
610 (Thanks to Stephen Colebourne for pointing to the decree.)
612 Asia/Dhaka ended DST on 2009-12-31 at 24:00, not 23:59.
614 A new file 'backzone' contains data which may appeal to
615 connoisseurs of old time stamps, although it is out of scope for
616 the tz database, is often poorly sourced, and contains some data
617 that is known to be incorrect. The new file is not recommended
618 for ordinary use and its entries are not installed by default.
619 (Thanks to Lester Caine for the high-quality Jersey, Guernsey, and
620 Isle of Man entries.)
622 Some more zones have been turned into links, when they differed
623 from existing zones only for older time stamps. As usual,
624 these changes affect UTC offsets in pre-1970 time stamps only.
625 Their old contents have been moved to the 'backzone' file.
626 The affected zones are: Africa/Bangui, Africa/Brazzaville,
627 Africa/Douala, Africa/Kinshasa, Africa/Libreville, Africa/Luanda,
628 Africa/Malabo, Africa/Niamey, and Africa/Porto-Novo.
630 Changes affecting code
632 Unless NETBSD_INSPIRED is defined to 0, the tz library now
633 supplies functions for creating and using objects that represent
634 time zones. The new functions are tzalloc, tzfree, localtime_rz,
635 mktime_z, and (if STD_INSPIRED is also defined) posix2time_z and
636 time2posix_z. They are intended for performance: for example,
637 localtime_rz (unlike localtime_r) is trivially thread-safe without
638 locking. (Thanks to Christos Zoulas for proposing NetBSD-inspired
639 functions, and to Alan Barrett and Jonathan Lennox for helping to
642 zdump now builds with the tz library unless USE_LTZ is defined to 0,
643 This lets zdump use tz features even if the system library lacks them.
644 To build zdump with the system library, use 'make CFLAGS=-DUSE_LTZ=0
645 TZDOBJS=zdump.o CHECK_TIME_T_ALTERNATIVES='.
647 zdump now uses localtime_rz if available, as it's significantly faster,
648 and it can help zdump better diagnose invalid time zone names.
649 Define HAVE_LOCALTIME_RZ to 0 to suppress this. HAVE_LOCALTIME_RZ
650 defaults to 1 if NETBSD_INSPIRED && USE_LTZ. When localtime_rz is
651 not available, zdump now uses localtime_r and tzset if available,
652 as this is a bit cleaner and faster than plain localtime. Compile
653 with -DHAVE_LOCALTIME_R=0 and/or -DHAVE_TZSET=0 if your system
654 lacks these two functions.
656 If THREAD_SAFE is defined to 1, the tz library is now thread-safe.
657 Although not needed for tz's own applications, which are single-threaded,
658 this supports POSIX better if the tz library is used in multithreaded apps.
660 Some crashes have been fixed when zdump or the tz library is given
661 invalid or outlandish input.
663 The tz library no longer mishandles leap seconds on platforms with
664 unsigned time_t in time zones that lack ordinary transitions after 1970.
666 The tz code now attempts to infer TM_GMTOFF and TM_ZONE if not
667 already defined, to make it easier to configure on common platforms.
668 Define NO_TM_GMTOFF and NO_TM_ZONE to suppress this.
670 Unless the new macro UNINIT_TRAP is defined to 1, the tz code now
671 assumes that reading uninitialized memory yields garbage values
672 but does not cause other problems such as traps.
674 If TM_GMTOFF is defined and UNINIT_TRAP is 0, mktime is now
675 more likely to guess right for ambiguous time stamps near
676 transitions where tm_isdst does not change.
678 If HAVE_STRFTIME_L is defined to 1, the tz library now defines
679 strftime_l for compatibility with recent versions of POSIX.
680 Only the C locale is supported, though. HAVE_STRFTIME_L defaults
681 to 1 on recent POSIX versions, and to 0 otherwise.
683 tzselect -c now uses a hybrid distance measure that works better
684 in Africa. (Thanks to Alan Barrett for noting the problem.)
686 The C source code now ports to NetBSD when GCC_DEBUG_FLAGS is used,
687 or when time_tz is defined.
689 When HAVE_UTMPX_H is set the 'date' command now builds on systems
690 whose <utmpx.h> file does not define WTMPX_FILE, and when setting
691 the date it updates the wtmpx file if _PATH_WTMPX is defined.
692 This affects GNU/Linux and similar systems.
694 For easier maintenance later, some C code has been simplified,
695 some lint has been removed, and the code has been tweaked so that
696 plain 'make' is more likely to work.
698 The C type 'bool' is now used for boolean values, instead of 'int'.
700 The long-obsolete LOCALE_HOME code has been removed.
702 The long-obsolete 'gtime' function has been removed.
704 Changes affecting build procedure
706 'zdump' no longer links in ialloc.o, as it's not needed.
708 'make check_time_t_alternatives' no longer assumes GNU diff.
710 Changes affecting distribution tarballs
712 The files checktab.awk and zoneinfo2tdf.pl are now distributed in
713 the tzdata tarball instead of the tzcode tarball, since they help
714 maintain the data. The NEWS and Theory files are now also
715 distributed in the tzdata tarball, as they're relevant for data.
716 (Thanks to Alan Barrett for pointing this out.) Also, the
717 leapseconds.awk file is no longer distributed in the tzcode
718 tarball, since it belongs in the tzdata tarball (where 2014f
719 inadvertently also distributed it).
721 Changes affecting documentation and commentary
723 A new file CONTRIBUTING is distributed. (Thanks to Tim Parenti for
724 suggesting a CONTRIBUTING file, and to Tony Finch and Walter Harms
727 The man pages have been updated to use function prototypes,
728 to document thread-safe variants like localtime_r, and to document
729 the NetBSD-inspired functions tzalloc, tzfree, localtime_rz, and
732 The fields in Link lines have been renamed to be more descriptive
733 and more like the parameters of 'ln'. LINK-FROM has become TARGET,
734 and LINK-TO has become LINK-NAME.
736 tz-link.htm mentions the IETF's tzdist working group; Windows
737 Runtime etc. (thanks to Matt Johnson); and HP-UX's tztab.
739 Some broken URLs have been fixed in the commentary. (Thanks to
742 Commentary about Philippines DST has been updated, and commentary
743 on pre-1970 time in India has been added.
746 Release 2014f - 2014-08-05 17:42:36 -0700
748 Changes affecting future time stamps
750 Russia will subtract an hour from most of its time zones on 2014-10-26
751 at 02:00 local time. (Thanks to Alexander Krivenyshev.)
752 There are a few exceptions: Magadan Oblast (Asia/Magadan) and Zabaykalsky
753 Krai are subtracting two hours; conversely, Chukotka Autonomous Okrug
754 (Asia/Anadyr), Kamchatka Krai (Asia/Kamchatka), Kemerovo Oblast
755 (Asia/Novokuznetsk), and the Samara Oblast and the Udmurt Republic
756 (Europe/Samara) are not changing their clocks. The changed zones are
757 Europe/Kaliningrad, Europe/Moscow, Europe/Simferopol, Europe/Volgograd,
758 Asia/Yekaterinburg, Asia/Omsk, Asia/Novosibirsk, Asia/Krasnoyarsk,
759 Asia/Irkutsk, Asia/Yakutsk, Asia/Vladivostok, Asia/Khandyga,
760 Asia/Sakhalin, and Asia/Ust-Nera; Asia/Magadan will have two hours
761 subtracted; and Asia/Novokuznetsk's time zone abbreviation is affected,
762 but not its UTC offset. Two zones are added: Asia/Chita (split
763 from Asia/Yakutsk, and also with two hours subtracted) and
764 Asia/Srednekolymsk (split from Asia/Magadan, but with only one hour
765 subtracted). (Thanks to Tim Parenti for much of the above.)
767 Changes affecting time zone abbreviations
769 Australian eastern time zone abbreviations are now AEST/AEDT not EST,
770 and similarly for the other Australian zones. That is, for eastern
771 standard and daylight saving time the abbreviations are AEST and AEDT
772 instead of the former EST for both; similarly, ACST/ACDT, ACWST/ACWDT,
773 and AWST/AWDT are now used instead of the former CST, CWST, and WST.
774 This change does not affect UTC offsets, only time zone abbreviations.
775 (Thanks to Rich Tibbett and many others.)
777 Asia/Novokuznetsk shifts from NOVT to KRAT (remaining on UTC+7)
778 effective 2014-10-26 at 02:00 local time.
780 The time zone abbreviation for Xinjiang Time (observed in Ürümqi)
781 has been changed from URUT to XJT. (Thanks to Luther Ma.)
783 Prefer MSK/MSD for Moscow time in Russia, even in other cities.
784 Similarly, prefer EET/EEST for eastern European time in Russia.
786 Change time zone abbreviations in (western) Samoa to use "ST" and
787 "DT" suffixes, as this is more likely to match common practice.
788 Prefix "W" to (western) Samoa time when its standard-time offset
789 disagrees with that of American Samoa.
791 America/Metlakatla now uses PST, not MeST, to abbreviate its time zone.
793 Time zone abbreviations have been updated for Japan's two time
794 zones used 1896-1937. JWST now stands for Western Standard
795 Time, and JCST for Central Standard Time (formerly this was CJT).
796 These abbreviations are now used for time in Korea, Taiwan,
797 and Sakhalin while controlled by Japan.
799 Changes affecting past time stamps
801 China's five zones have been simplified to two, since the post-1970
802 differences in the other three seem to have been imaginary. The
803 zones Asia/Harbin, Asia/Chongqing, and Asia/Kashgar have been
804 removed; backwards-compatibility links still work, albeit with
805 different behaviors for time stamps before May 1980. Asia/Urumqi's
806 1980 transition to UTC+8 has been removed, so that it is now at
807 UTC+6 and not UTC+8. (Thanks to Luther Ma and to Alois Treindl;
808 Treindl sent helpful translations of two papers by Guo Qingsheng.)
810 Some zones have been turned into links, when they differed from existing
811 zones only for older UTC offsets where data entries were likely invented.
812 These changes affect UTC offsets in pre-1970 time stamps only. This is
813 similar to the change in release 2013e, except this time for western
814 Africa. The affected zones are: Africa/Bamako, Africa/Banjul,
815 Africa/Conakry, Africa/Dakar, Africa/Freetown, Africa/Lome,
816 Africa/Nouakchott, Africa/Ouagadougou, Africa/Sao_Tome, and
817 Atlantic/St_Helena. This also affects the backwards-compatibility
818 link Africa/Timbuktu. (Thanks to Alan Barrett, Stephen Colebourne,
819 Tim Parenti, and David Patte for reporting problems in earlier
820 versions of this change.)
822 Asia/Shanghai's pre-standard-time UT offset has been changed from
823 8:05:57 to 8:05:43, the location of Xujiahui Observatory. Its
824 transition to standard time has been changed from 1928 to 1901.
826 Asia/Taipei switched to JWST on 1896-01-01, then to JST on 1937-10-01,
827 then to CST on 1945-09-21 at 01:00, and did not observe DST in 1945.
828 In 1946 it observed DST from 05-15 through 09-30; in 1947
829 from 04-15 through 10-31; and in 1979 from 07-01 through 09-30.
830 (Thanks to Yu-Cheng Chuang.)
832 Asia/Riyadh's transition to standard time is now 1947-03-14, not 1950.
834 Europe/Helsinki's 1942 fall-back transition was 10-04 at 01:00, not
835 10-03 at 00:00. (Thanks to Konstantin Hyppönen.)
837 Pacific/Pago_Pago has been changed from UTC-11:30 to UTC-11 for the period
840 Pacific/Chatham has been changed to New Zealand standard time plus
841 45 minutes for the period before 1957, reflecting a 1956 remark in
842 the New Zealand parliament.
844 Europe/Budapest has several pre-1946 corrections: in 1918 the transition
845 out of DST was on 09-16, not 09-29; in 1919 it was on 11-24, not 09-15; in
846 1945 it was on 11-01, not 11-03; in 1941 the transition to DST was 04-08
847 not 04-06 at 02:00; and there was no DST in 1920.
849 Africa/Accra is now assumed to have observed DST from 1920 through 1935.
851 Time in Russia before 1927 or so has been corrected by a few seconds in
852 the following zones: Europe/Moscow, Asia/Irkutsk, Asia/Tbilisi,
853 Asia/Tashkent, Asia/Vladivostok, Asia/Yekaterinburg, Europe/Helsinki, and
854 Europe/Riga. Also, Moscow's location has been changed to its Kilometer 0
855 point. (Thanks to Vladimir Karpinsky for the Moscow changes.)
857 Changes affecting data format
859 A new file 'zone1970.tab' supersedes 'zone.tab' in the installed data.
860 The new file's extended format allows multiple country codes per zone.
861 The older file is still installed but is deprecated; its format is
862 not changing and it will still be distributed for a while, but new
863 applications should use the new file.
865 The new file format simplifies maintenance of obscure locations.
866 To test this, it adds coverage for the Crozet Islands and the
867 Scattered Islands. (Thanks to Tobias Conradi and Antoine Leca.)
869 The file 'iso3166.tab' is planned to switch from ASCII to UTF-8.
870 It is still ASCII now, but commentary about the switch has been added.
871 The new file 'zone1970.tab' already uses UTF-8.
873 Changes affecting code
875 'localtime', 'mktime', etc. now use much less stack space if ALL_STATE
876 is defined. (Thanks to Elliott Hughes for reporting the problem.)
878 'zic' no longer mishandles input when ignoring case in locales that
879 are not compatible with English, e.g., unibyte Turkish locales when
880 compiled with HAVE_GETTEXT.
882 Error diagnostics of 'zic' and 'yearistype' have been reworded so that
883 they no longer use ASCII '-' as if it were a dash.
885 'zic' now rejects output file names that contain '.' or '..' components.
886 (Thanks to Tim Parenti for reporting the problem.)
888 'zic -v' now warns about output file names that do not follow
889 POSIX rules, or that contain a digit or '.'. (Thanks to Arthur
890 David Olson for starting the ball rolling on this.)
892 Some lint has been removed when using GCC_DEBUG_FLAGS with GCC 4.9.0.
894 Changes affecting build procedure
896 'zic' no longer links in localtime.o and asctime.o, as they're not needed.
897 (Thanks to John Cochran.)
899 Changes affecting documentation and commentary
901 The 'Theory' file documents legacy names, the longstanding
902 exceptions to the POSIX-inspired file name rules.
904 The 'zic' documentation clarifies the role of time types when
905 interpreting dates. (Thanks to Arthur David Olson.)
907 Documentation and commentary now prefer UTF-8 to US-ASCII,
908 allowing the use of proper accents in foreign words and names.
909 Code and data have not changed because of this. (Thanks to
910 Garrett Wollman, Ian Abbott, and Guy Harris for helping to debug
913 Non-HTML documentation and commentary now use plain-text URLs instead of
914 HTML insertions, and are more consistent about bracketing URLs when they
915 are not already surrounded by white space. (Thanks to suggestions by
918 There is new commentary about Xujiahui Observatory, the five time-zone
919 project in China from 1918 to 1949, timekeeping in Japanese-occupied
920 Shanghai, and Tibet Time in the 1950s. The sharp-eyed can spot the
921 warlord Jin Shuren in the data.
923 Commentary about the coverage of each Russian zone has been standardized.
924 (Thanks to Tim Parenti).
926 There is new commentary about contemporary timekeeping in Ethiopia.
928 Obsolete comments about a 2007 proposal for DST in Kuwait has been removed.
930 There is new commentary about time in Poland in 1919.
932 Proper credit has been given to DST inventor George Vernon Hudson.
934 Commentary about time in Metlakatla, AK and Resolute, NU has been
935 improved, with a new source for the former.
937 In zone.tab, Pacific/Easter no longer mentions Salas y Gómez, as it
940 Commentary about permanent Antarctic bases has been updated.
942 Several typos have been corrected. (Thanks to Tim Parenti for
943 contributing some of these fixes.)
945 tz-link.htm now mentions the JavaScript libraries Moment Timezone,
946 TimezoneJS.Date, Walltime-js, and Timezone. (Thanks to a heads-up
947 from Matt Johnson.) Also, it mentions the Go 'latlong' package.
948 (Thanks to a heads-up from Dirkjan Ochtman.)
950 The files usno1988, usno1989, usno1989a, usno1995, usno1997, and usno1998
951 have been removed. These obsolescent US Naval Observatory entries were no
952 longer helpful for maintenance. (Thanks to Tim Parenti for the suggestion.)
955 Release 2014e - 2014-06-12 21:53:52 -0700
957 Changes affecting near-future time stamps
959 Egypt's 2014 Ramadan-based transitions are June 26 and July 31 at 24:00.
960 (Thanks to Imed Chihi.) Guess that from 2015 on Egypt will temporarily
961 switch to standard time at 24:00 the last Thursday before Ramadan, and
962 back to DST at 00:00 the first Friday after Ramadan.
964 Similarly, Morocco's are June 28 at 03:00 and August 2 at 02:00. (Thanks
965 to Milamber Space Network.) Guess that from 2015 on Morocco will
966 temporarily switch to standard time at 03:00 the last Saturday before
967 Ramadan, and back to DST at 02:00 the first Saturday after Ramadan.
969 Changes affecting past time stamps
971 The abbreviation "MSM" (Moscow Midsummer Time) is now used instead of
972 "MSD" for Moscow's double daylight time in summer 1921. Also, a typo
973 "VLASST" has been repaired to be "VLAST" for Vladivostok summer time
974 in 1991. (Thanks to Hank W. for reporting the problems.)
976 Changes affecting commentary
978 tz-link.htm now cites RFC 7265 for jCal, mentions PTP and the
979 draft CalDAV extension, updates URLs for TSP, TZInfo, IATA, and
980 removes stale pointers to World Time Explorer and WORLDTIME.
983 Release 2014d - 2014-05-27 21:34:40 -0700
985 Changes affecting code
987 zic no longer generates files containing time stamps before the Big Bang.
988 This works around GNOME bug 730332
989 <https://bugzilla.gnome.org/show_bug.cgi?id=730332>.
990 (Thanks to Leonardo Chiquitto for reporting the bug, and to
991 Arthur David Olson and James Cloos for suggesting improvements to the fix.)
993 Changes affecting documentation
995 tz-link.htm now mentions GNOME.
998 Release 2014c - 2014-05-13 07:44:13 -0700
1000 Changes affecting near-future time stamps
1002 Egypt observes DST starting 2014-05-15 at 24:00.
1003 (Thanks to Ahmad El-Dardiry and Gunther Vermier.)
1004 Details have not been announced, except that DST will not be observed
1005 during Ramadan. Guess that DST will stop during the same Ramadan dates as
1006 Morocco, and that Egypt's future spring and fall transitions will be the
1007 same as 2010 when it last observed DST, namely April's last Friday at
1008 00:00 to September's last Thursday at 23:00 standard time. Also, guess
1009 that Ramadan transitions will be at 00:00 standard time.
1011 Changes affecting code
1013 zic now generates transitions for minimum time values, eliminating guesswork
1014 when handling low-valued time stamps. (Thanks to Arthur David Olson.)
1016 Port to Cygwin sans glibc. (Thanks to Arthur David Olson.)
1018 Changes affecting commentary and documentation
1020 Remove now-confusing comment about Jordan. (Thanks to Oleksii Nochovnyi.)
1023 Release 2014b - 2014-03-24 21:28:50 -0700
1025 Changes affecting near-future time stamps
1027 Crimea switches to Moscow time on 2014-03-30 at 02:00 local time.
1028 (Thanks to Alexander Krivenyshev.) Move its zone.tab entry from UA to RU.
1030 New entry for Troll station, Antarctica. (Thanks to Paul-Inge Flakstad and
1031 Bengt-Inge Larsson.) This is currently an approximation; a better version
1032 will require the zic and localtime fixes mentioned below, and the plan is
1033 to wait for a while until at least the zic fixes propagate.
1035 Changes affecting code
1037 'zic' and 'localtime' no longer reject locations needing four transitions
1038 per year for the foreseeable future. (Thanks to Andrew Main (Zefram).)
1039 Also, 'zic' avoids some unlikely failures due to integer overflow.
1041 Changes affecting build procedure
1043 'make check' now detects Rule lines defined but never used.
1044 The NZAQ rules, an instance of this problem, have been removed.
1046 Changes affecting commentary and documentation
1048 Fix Tuesday/Thursday typo in description of time in Israel.
1049 (Thanks to Bert Katz via Pavel Kharitonov and Mike Frysinger.)
1051 Microsoft Windows 8.1 doesn't support tz database names. (Thanks
1052 to Donald MacQueen.) Instead, the Microsoft Windows Store app
1053 library supports them.
1055 Add comments about Johnston Island time in the 1960s.
1056 (Thanks to Lyle McElhaney.)
1058 Morocco's 2014 DST start will be as predicted.
1059 (Thanks to Sebastien Willemijns.)
1062 Release 2014a - 2014-03-07 23:30:29 -0800
1064 Changes affecting near-future time stamps
1066 Turkey begins DST on 2014-03-31, not 03-30. (Thanks to Faruk Pasin for
1067 the heads-up, and to Tim Parenti for simplifying the update.)
1069 Changes affecting past time stamps
1071 Fiji ended DST on 2014-01-19 at 02:00, not the previously-scheduled 03:00.
1072 (Thanks to Steffen Thorsen.)
1074 Ukraine switched from Moscow to Eastern European time on 1990-07-01
1075 (not 1992-01-01), and observed DST during the entire next winter.
1076 (Thanks to Vladimir in Moscow via Alois Treindl.)
1078 In 1988 Israel observed DST from 04-10 to 09-04, not 04-09 to 09-03.
1079 (Thanks to Avigdor Finkelstein.)
1081 Changes affecting code
1083 A uninitialized-storage bug in 'localtime' has been fixed.
1084 (Thanks to Logan Chien.)
1086 Changes affecting the build procedure
1088 The settings for 'make check_web' now default to Ubuntu 13.10.
1090 Changes affecting commentary and documentation
1092 The boundary of the US Pacific time zone is given more accurately.
1093 (Thanks to Alan Mintz.)
1095 Chile's 2014 DST will be as predicted. (Thanks to José Miguel Garrido.)
1097 Paraguay's 2014 DST will be as predicted. (Thanks to Carlos Raúl Perasso.)
1099 Better descriptions of countries with same time zone history as
1100 Trinidad and Tobago since 1970. (Thanks to Alan Barrett for suggestion.)
1102 Several changes affect tz-link.htm, the main web page.
1104 Mention Time.is (thanks to Even Scharning) and WX-now (thanks to
1107 Mention xCal (Internet RFC 6321) and jCal.
1109 Microsoft has some support for tz database names.
1111 CLDR data formats include both XML and JSON.
1113 Mention Maggiolo's map of solar vs standard time.
1114 (Thanks to Arthur David Olson.)
1116 Mention TZ4Net. (Thanks to Matt Johnson.)
1118 Mention the timezone-olson Haskell package.
1120 Mention zeitverschiebung.net. (Thanks to Martin Jäger.)
1122 Remove moribund links to daylight-savings-time.info and to
1123 Simple Timer + Clocks.
1125 Update two links. (Thanks to Oscar van Vlijmen.)
1127 Fix some formatting glitches, e.g., remove random newlines from
1128 abbr elements' title attributes.
1131 Release 2013i - 2013-12-17 07:25:23 -0800
1133 Changes affecting near-future time stamps:
1135 Jordan switches back to standard time at 00:00 on December 20, 2013.
1136 The 2006-2011 transition schedule is planned to resume in 2014.
1137 (Thanks to Steffen Thorsen.)
1139 Changes affecting past time stamps:
1141 In 2004, Cuba began DST on March 28, not April 4.
1142 (Thanks to Steffen Thorsen.)
1144 Changes affecting code
1146 The compile-time flag NOSOLAR has been removed, as nowadays the
1147 benefit of slightly shrinking runtime table size is outweighed by the
1148 cost of disallowing potential future updates that exceed old limits.
1150 Changes affecting documentation and commentary
1152 The files solar87, solar88, and solar89 are no longer distributed.
1153 They were a negative experiment - that is, a demonstration that
1154 tz data can represent solar time only with some difficulty and error.
1155 Their presence in the distribution caused confusion, as Riyadh
1156 civil time was generally not solar time in those years.
1158 tz-link.htm now mentions Noda Time. (Thanks to Matt Johnson.)
1161 Release 2013h - 2013-10-25 15:32:32 -0700
1163 Changes affecting current and future time stamps:
1165 Libya has switched its time zone back to UTC+2 without DST,
1166 instead of UTC+1 with DST. (Thanks to Even Scharning.)
1168 Western Sahara (Africa/El_Aaiun) uses Morocco's DST rules.
1169 (Thanks to Gwillim Law.)
1171 Changes affecting future time stamps:
1173 Acre and (we guess) western Amazonas will switch from UTC-4 to UTC-5
1174 on 2013-11-10. This affects America/Rio_Branco and America/Eirunepe.
1175 (Thanks to Steffen Thorsen.)
1177 Add entries for DST transitions in Morocco in the year 2038.
1178 This avoids some year-2038 glitches introduced in 2013g.
1179 (Thanks to Yoshito Umaoka for reporting the problem.)
1181 Changes affecting API
1183 The 'tzselect' command no longer requires the 'select' command,
1184 and should now work with /bin/sh on more platforms. It also works
1185 around a bug in BusyBox awk before version 1.21.0. (Thanks to
1186 Patrick 'P. J.' McDermott and Alan Barrett.)
1188 Changes affecting code
1190 Fix localtime overflow bugs with 32-bit unsigned time_t.
1192 zdump no longer assumes sscanf returns maximal values on overflow.
1194 Changes affecting the build procedure
1196 The builder can specify which programs to use, if any, instead of
1197 'ar' and 'ranlib', and libtz.a is now built locally before being
1198 installed. (Thanks to Michael Forney.)
1200 A dependency typo in the 'zdump' rule has been fixed.
1201 (Thanks to Andrew Paprocki.)
1203 The Makefile has been simplified by assuming that 'mkdir -p' and 'cp -f'
1204 work as specified by POSIX.2-1992 or later; this is portable nowadays.
1206 'make clean' no longer removes 'leapseconds', since it's
1207 host-independent and is part of the distribution.
1209 The unused makefile macros TZCSRCS, TZDSRCS, DATESRCS have been removed.
1211 Changes affecting documentation and commentary
1213 tz-link.htm now mentions TC TIMEZONE's draft time zone service protocol
1214 (thanks to Mike Douglass) and TimezoneJS.Date (thanks to Jim Fehrle).
1216 Update URLs in tz-link page. Add URLs for Microsoft Windows, since
1217 8.1 introduces tz support. Remove URLs for Tru64 and UnixWare (no
1218 longer maintained) and for old advisories. SOFA now does C.
1220 Release 2013g - 2013-09-30 21:08:26 -0700
1222 Changes affecting current and near-future time stamps
1224 Morocco now observes DST from the last Sunday in March to the last
1225 Sunday in October, not April to September respectively. (Thanks
1226 to Steffen Thorsen.)
1228 Changes affecting 'zic'
1230 'zic' now runs on platforms that lack both hard links and symlinks.
1231 (Thanks to Theo Veenker for reporting the problem, for MinGW.)
1232 Also, fix some bugs on platforms that lack hard links but have symlinks.
1234 'zic -v' again warns that Asia/Tehran has no POSIX environment variable
1235 to predict the far future, fixing a bug introduced in 2013e.
1237 Changes affecting the build procedure
1239 The 'leapseconds' file is again put into the tzdata tarball.
1240 Also, 'leapseconds.awk', so tzdata is self-contained. (Thanks to
1241 Matt Burgess and Ian Abbott.) The timestamps of these and other
1242 dependent files in tarballs are adjusted more consistently.
1244 Changes affecting documentation and commentary
1246 The README file is now part of the data tarball as well as the code.
1247 It now states that files are public domain unless otherwise specified.
1248 (Thanks to Andrew Main (Zefram) for asking for clarifications.)
1249 Its details about the 1989 release moved to a place of honor near
1253 Release 2013f - 2013-09-24 23:37:36 -0700
1255 Changes affecting near-future time stamps
1257 Tocantins will very likely not observe DST starting this spring.
1258 (Thanks to Steffen Thorsen.)
1260 Jordan will likely stay at UTC+3 indefinitely, and will not fall
1263 Palestine will fall back at 00:00, not 01:00. (Thanks to Steffen Thorsen.)
1265 Changes affecting API
1267 The types of the global variables 'timezone' and 'altzone' (if present)
1268 have been changed back to 'long'. This is required for 'timezone'
1269 by POSIX, and for 'altzone' by common practice, e.g., Solaris 11.
1270 These variables were originally 'long' in the tz code, but were
1271 mistakenly changed to 'time_t' in 1987; nobody reported the
1272 incompatibility until now. The difference matters on x32, where
1273 'long' is 32 bits and 'time_t' is 64. (Thanks to Elliott Hughes.)
1275 Changes affecting the build procedure
1277 Avoid long strings in leapseconds.awk to work around a mawk bug.
1278 (Thanks to Cyril Baurand.)
1280 Changes affecting documentation and commentary
1282 New file 'NEWS' that contains release notes like this one.
1284 Paraguay's law does not specify DST transition time; 00:00 is customary.
1285 (Thanks to Waldemar Villamayor-Venialbo.)
1287 Minor capitalization fixes.
1289 Changes affecting version-control only
1291 The experimental GitHub repository now contains annotated and
1292 signed tags for recent releases, e.g., '2013e' for Release 2013e.
1293 Releases are tagged starting with 2012e; earlier releases were
1294 done differently, and tags would either not have a simple name or
1295 not exactly match what was released.
1297 'make set-timestamps' is now simpler and a bit more portable.
1300 Release 2013e - 2013-09-19 23:50:04 -0700
1302 Changes affecting near-future time stamps
1304 This year Fiji will start DST on October 27, not October 20.
1305 (Thanks to David Wheeler for the heads-up.) For now, guess that
1306 Fiji will continue to spring forward the Sunday before the fourth
1309 Changes affecting current and future time zone abbreviations
1311 Use WIB/WITA/WIT rather than WIT/CIT/EIT for alphabetic Indonesian
1312 time zone abbreviations since 1932. (Thanks to George Ziegler,
1313 Priyadi Iman Nurcahyo, Zakaria, Jason Grimes, Martin Pitt, and
1314 Benny Lin.) This affects Asia/Dili, Asia/Jakarta, Asia/Jayapura,
1315 Asia/Makassar, and Asia/Pontianak.
1317 Use ART (UTC-3, standard time), rather than WARST (also UTC-3, but
1318 daylight saving time) for San Luis, Argentina since 2009.
1320 Changes affecting Godthåb time stamps after 2037 if version mismatch
1322 Allow POSIX-like TZ strings where the transition time's hour can
1323 range from -167 through 167, instead of the POSIX-required 0
1324 through 24. E.g., TZ='FJT-12FJST,M10.3.1/146,M1.3.4/75' for the
1325 new Fiji rules. This is a more-compact way to represent
1326 far-future time stamps for America/Godthab, America/Santiago,
1327 Antarctica/Palmer, Asia/Gaza, Asia/Hebron, Asia/Jerusalem,
1328 Pacific/Easter, and Pacific/Fiji. Other zones are unaffected by
1329 this change. (Derived from a suggestion by Arthur David Olson.)
1331 Allow POSIX-like TZ strings where daylight saving time is in
1332 effect all year. E.g., TZ='WART4WARST,J1/0,J365/25' for Western
1333 Argentina Summer Time all year. This supports a more-compact way
1334 to represent the 2013d data for America/Argentina/San_Luis.
1335 Because of the change for San Luis noted above this change does not
1336 affect the current data. (Thanks to Andrew Main (Zefram) for
1337 suggestions that improved this change.)
1339 Where these two TZ changes take effect, there is a minor extension
1340 to the tz file format in that it allows new values for the
1341 embedded TZ-format string, and the tz file format version number
1342 has therefore been increased from 2 to 3 as a precaution.
1343 Version-2-based client code should continue to work as before for
1344 all time stamps before 2038. Existing version-2-based client code
1345 (tzcode, GNU/Linux, Solaris) has been tested on version-3-format
1346 files, and typically works in practice even for time stamps after
1347 2037; the only known exception is America/Godthab.
1349 Changes affecting time stamps before 1970
1351 Pacific/Johnston is now a link to Pacific/Honolulu. This corrects
1352 some errors before 1947.
1354 Some zones have been turned into links, when they differ from existing
1355 zones only in older data entries that were likely invented or that
1356 differ only in LMT or transitions from LMT. These changes affect
1357 only time stamps before 1943. The affected zones are:
1358 Africa/Juba, America/Anguilla, America/Aruba, America/Dominica,
1359 America/Grenada, America/Guadeloupe, America/Marigot,
1360 America/Montserrat, America/St_Barthelemy, America/St_Kitts,
1361 America/St_Lucia, America/St_Thomas, America/St_Vincent,
1362 America/Tortola, and Europe/Vaduz. (Thanks to Alois Treindl for
1363 confirming that the old Europe/Vaduz zone was wrong and the new
1364 link is better for WWII-era times.)
1366 Change Kingston Mean Time from -5:07:12 to -5:07:11. This affects
1367 America/Cayman, America/Jamaica and America/Grand_Turk time stamps
1370 Change the UT offset of Bern Mean Time from 0:29:44 to 0:29:46.
1371 This affects Europe/Zurich time stamps from 1853 to 1894. (Thanks
1374 Change the date of the circa-1850 Zurich transition from 1849-09-12
1375 to 1853-07-16, overriding Shanks with data from Messerli about
1376 postal and telegraph time in Switzerland.
1378 Changes affecting time zone abbreviations before 1970
1380 For Asia/Jakarta, use BMT (not JMT) for mean time from 1923 to 1932,
1381 as Jakarta was called Batavia back then.
1383 Changes affecting API
1385 The 'zic' command now outputs a dummy transition when far-future
1386 data can't be summarized using a TZ string, and uses a 402-year
1387 window rather than a 400-year window. For the current data, this
1388 affects only the Asia/Tehran file. It does not affect any of the
1389 time stamps that this file represents, so zdump outputs the same
1390 information as before. (Thanks to Andrew Main (Zefram).)
1392 The 'date' command has a new '-r' option, which lets you specify
1393 the integer time to display, a la FreeBSD.
1395 The 'tzselect' command has two new options '-c' and '-n', which lets you
1396 select a zone based on latitude and longitude.
1398 The 'zic' command's '-v' option now warns about constructs that
1399 require the new version-3 binary file format. (Thanks to Arthur
1400 David Olson for the suggestion.)
1402 Support for floating-point time_t has been removed.
1403 It was always dicey, and POSIX no longer requires it.
1404 (Thanks to Eric Blake for suggesting to the POSIX committee to
1405 remove it, and thanks to Alan Barrett, Clive D.W. Feather, Andy
1406 Heninger, Arthur David Olson, and Alois Treindl, for reporting
1407 bugs and elucidating some of the corners of the old floating-point
1410 The signatures of 'offtime', 'timeoff', and 'gtime' have been
1411 changed back to the old practice of using 'long' to represent UT
1412 offsets. This had been inadvertently and mistakenly changed to
1413 'int_fast32_t'. (Thanks to Christos Zoulas.)
1415 The code avoids undefined behavior on integer overflow in some
1416 more places, including gmtime, localtime, mktime and zdump.
1418 Changes affecting the zdump utility
1420 zdump now outputs "UT" when referring to Universal Time, not "UTC".
1421 "UTC" does not make sense for time stamps that predate the introduction
1422 of UTC, whereas "UT", a more-generic term, does. (Thanks to Steve Allen
1423 for clarifying UT vs UTC.)
1425 Data changes affecting behavior of tzselect and similar programs
1427 Country code BQ is now called the more-common name "Caribbean Netherlands"
1428 rather than the more-official "Bonaire, St Eustatius & Saba".
1430 Remove from zone.tab the names America/Montreal, America/Shiprock,
1431 and Antarctica/South_Pole, as they are equivalent to existing
1432 same-country-code zones for post-1970 time stamps. The data entries for
1433 these names are unchanged, so the names continue to work as before.
1435 Changes affecting code internals
1437 zic -c now runs way faster on 64-bit hosts when given large numbers.
1439 zic now uses vfprintf to avoid allocating and freeing some memory.
1441 tzselect now computes the list of continents from the data,
1442 rather than have it hard-coded.
1444 Minor changes pacify GCC 4.7.3 and GCC 4.8.1.
1446 Changes affecting the build procedure
1448 The 'leapseconds' file is now generated automatically from a
1449 new file 'leap-seconds.list', which is a copy of
1450 <ftp://time.nist.gov/pub/leap-seconds.list>.
1451 A new source file 'leapseconds.awk' implements this.
1452 The goal is simplification of the future maintenance of 'leapseconds'.
1454 When building the 'posix' or 'right' subdirectories, if the
1455 subdirectory would be a copy of the default subdirectory, it is
1456 now made a symbolic link if that is supported. This saves about
1457 2 MB of file system space.
1459 The links America/Shiprock and Antarctica/South_Pole have been
1460 moved to the 'backward' file. This affects only nondefault builds
1461 that omit 'backward'.
1463 Changes affecting version-control only
1465 .gitignore now ignores 'date'.
1467 Changes affecting documentation and commentary
1469 Changes to the 'tzfile' man page
1471 It now mentions that the binary file format may be extended in
1472 future versions by appending data.
1474 It now refers to the 'zdump' and 'zic' man pages.
1476 Changes to the 'zic' man page
1478 It lists conditions that elicit a warning with '-v'.
1480 It says that the behavior is unspecified when duplicate names
1481 are given, or if the source of one link is the target of another.
1483 Its examples are updated to match the latest data.
1485 The definition of white space has been clarified slightly.
1486 (Thanks to Michael Deckers.)
1488 Changes to the 'Theory' file
1490 There is a new section about the accuracy of the tz database,
1491 describing the many ways that errors can creep in, and
1492 explaining why so many of the pre-1970 time stamps are wrong or
1493 misleading (thanks to Steve Allen, Lester Caine, and Garrett
1494 Wollman for discussions that contributed to this).
1496 The 'Theory' file describes LMT better (this follows a
1497 suggestion by Guy Harris).
1499 It refers to the 2013 edition of POSIX rather than the 2004 edition.
1501 It's mentioned that excluding 'backward' should not affect the
1502 other data, and it suggests at least one zone.tab name per
1503 inhabited country (thanks to Stephen Colebourne).
1505 Some longstanding restrictions on names are documented, e.g.,
1506 'America/New_York' precludes 'America/New_York/Bronx'.
1508 It gives more reasons for the 1970 cutoff.
1510 It now mentions which time_t variants are supported, such as
1511 signed integer time_t. (Thanks to Paul Goyette for reporting
1512 typos in an experimental version of this change.)
1514 (Thanks to Philip Newton for correcting typos in these changes.)
1516 Documentation and commentary is more careful to distinguish UT in
1517 general from UTC in particular. (Thanks to Steve Allen.)
1519 Add a better source for the Zurich 1894 transition.
1520 (Thanks to Pierre-Yves Berger.)
1522 Update shapefile citations in tz-link.htm. (Thanks to Guy Harris.)
1525 Release 2013d - 2013-07-05 07:38:01 -0700
1527 Changes affecting future time stamps:
1529 Morocco's midsummer transitions this year are July 7 and August 10,
1530 not July 9 and August 8. (Thanks to Andrew Paprocki.)
1532 Israel now falls back on the last Sunday of October.
1533 (Thanks to Ephraim Silverberg.)
1535 Changes affecting past time stamps:
1537 Specify Jerusalem's location more precisely; this changes the pre-1880
1540 Changing affecting metadata only:
1542 Fix typos in the entries for country codes BQ and SX.
1544 Changes affecting code:
1546 Rework the code to fix a bug with handling Australia/Macquarie on
1547 32-bit hosts (thanks to Arthur David Olson).
1549 Port to platforms like NetBSD, where time_t can be wider than long.
1551 Add support for testing time_t types other than the system's.
1552 Run 'make check_time_t_alternatives' to try this out.
1553 Currently, the tests fail for unsigned time_t;
1554 this should get fixed at some point.
1556 Changes affecting documentation and commentary:
1558 Deemphasize the significance of national borders.
1560 Update the zdump man page.
1562 Remove obsolete NOID comment (thanks to Denis Excoffier).
1564 Update several URLs and comments in the web pages.
1566 Spelling fixes (thanks to Kevin Lyda and Jonathan Leffler).
1568 Update URL for CLDR Zone->Tzid table (thanks to Yoshito Umaoka).
1571 Release 2013c - 2013-04-19 16:17:40 -0700
1573 Changes affecting current and future time stamps:
1575 Palestine observed DST starting March 29, 2013. (Thanks to
1576 Steffen Thorsen.) From 2013 on, Gaza and Hebron both observe DST,
1577 with the predicted rules being the last Thursday in March at 24:00
1578 to the first Friday on or after September 21 at 01:00.
1580 Assume that the recent change to Paraguay's DST rules is permanent,
1581 by moving the end of DST to the 4th Sunday in March every year.
1582 (Thanks to Carlos Raúl Perasso.)
1584 Changes affecting past time stamps:
1586 Fix some historical data for Palestine to agree with that of
1587 timeanddate.com, as follows:
1589 The spring 2008 change in Gaza and Hebron was on 00:00 Mar 28, not
1592 The fall 2009 change in Gaza and Hebron on Sep 4 was at 01:00, not
1595 The spring 2010 change in Hebron was 00:00 Mar 26, not 00:01 Mar 27.
1597 The spring 2011 change in Gaza was 00:01 Apr 1, not 12:01 Apr 2.
1599 The spring 2011 change in Hebron on Apr 1 was at 00:01, not 12:01.
1601 The fall 2011 change in Hebron on Sep 30 was at 00:00, not 03:00.
1603 Fix times of habitation for Macquarie to agree with the Tasmania
1604 Parks & Wildlife Service history, which indicates that permanent
1605 habitation was 1899-1919 and 1948 on.
1607 Changing affecting metadata only:
1609 Macquarie Island is politically part of Australia, not Antarctica.
1610 (Thanks to Tobias Conradi.)
1612 Sort Macquarie more-consistently with other parts of Australia.
1613 (Thanks to Tim Parenti.)
1616 Release 2013b - 2013-03-10 22:33:40 -0700
1618 Changes affecting current and future time stamps:
1620 Haiti uses US daylight-saving rules this year, and presumably future years.
1621 This changes time stamps starting today. (Thanks to Steffen Thorsen.)
1623 Paraguay will end DST on March 24 this year.
1624 (Thanks to Steffen Thorsen.) For now, assume it's just this year.
1626 Morocco does not observe DST during Ramadan;
1627 try to predict Ramadan in Morocco as best we can.
1628 (Thanks to Erik Homoet for the heads-up.)
1630 Changes affecting commentary:
1632 Update URLs in tz-link page. Add URLs for webOS, BB10, iOS.
1633 Update URL for Solaris. Mention Internet RFC 6557.
1634 Update Internet RFCs 2445->5545, 2822->5322.
1635 Switch from FTP to HTTP for Internet RFCs.
1638 Release 2013a - 2013-02-27 09:20:35 -0800
1640 Change affecting binary data format:
1642 The zone offset at the end of version-2-format zone files is now
1643 allowed to be 24:00, as per POSIX.1-2008. (Thanks to Arthur David Olson.)
1645 Changes affecting current and future time stamps:
1647 Chile's 2013 rules, and we guess rules for 2014 and later, will be
1648 the same as 2012, namely Apr Sun>=23 03:00 UTC to Sep Sun>=2 04:00 UTC.
1649 (Thanks to Steffen Thorsen and Robert Elz.)
1651 New Zones Asia/Khandyga, Asia/Ust-Nera, Europe/Busingen.
1652 (Thanks to Tobias Conradi and Arthur David Olson.)
1654 Many changes affect historical time stamps before 1940.
1655 These were deduced from: Milne J. Civil time. Geogr J. 1899
1656 Feb;13(2):173-94 <http://www.jstor.org/stable/1774359>.
1658 Changes affecting the code:
1660 Fix zic bug that mishandled Egypt's 2010 changes (this also affected
1661 the data). (Thanks to Arthur David Olson.)
1663 Fix localtime bug when time_t is unsigned and data files were generated
1664 by a signed time_t system. (Thanks to Doug Bailey for reporting and
1665 to Arthur David Olson for fixing.)
1667 Allow the email address for bug reports to be set by the packager.
1668 The default is tz@iana.org, as before. (Thanks to Joseph S. Myers.)
1670 Update HTML checking to be compatible with Ubuntu 12.10.
1672 Check that files are a safe subset of ASCII. At some point we may
1673 relax this requirement to a safe subset of UTF-8. Without the
1674 check, some non-UTF-8 encodings were leaking into the distribution.
1678 Restore a comment about copyright notices that was inadvertently deleted.
1679 (Thanks to Arthur David Olson.)
1681 Improve the commentary about which districts observe what times
1682 in Russia. (Thanks to Oscar van Vlijmen and Arthur David Olson).
1684 Add web page links to tz.js.
1686 Add "Run by the Monkeys" to tz-art. (Thanks to Arthur David Olson.)
1689 Release 2012j - 2012-11-12 18:34:49 -0800
1691 Libya moved to CET this weekend, but with DST planned next year.
1692 (Thanks to Even Scharning, Steffen Thorsen, and Tim Parenti.)
1694 Signatures now have the extension .asc, not .sign, as that's more
1695 standard. (Thanks to Phil Pennock.)
1697 The output of 'zdump --version', and of 'zic --version', now
1698 uses a format that is more typical for --version.
1699 (Thanks to Joseph S. Myers.)
1701 The output of 'tzselect --help', 'zdump --help', and 'zic --help'
1702 now uses tz@iana.org rather than the old elsie address.
1704 zic -v now complains about abbreviations that are less than 3
1705 or more than 6 characters, as per Posix. Formerly, it checked
1706 for abbreviations that were more than 3.
1708 'make public' no longer puts its temporary directory under /tmp,
1709 and uses the just-built zic rather than the system zic.
1711 Various fixes to documentation and commentary.
1714 Release 2012i - 2012-11-03 12:57:09 -0700
1716 Cuba switches from DST tomorrow at 01:00. (Thanks to Steffen Thorsen.)
1718 Linker flags can now be specified via LDFLAGS.
1719 AWK now defaults to 'awk', not 'nawk'.
1720 The shell in tzselect now defaults to /bin/bash, but this can
1721 be overridden by specifying KSHELL.
1722 The main web page now mentions the unofficial GitHub repository.
1723 (Thanks to Mike Frysinger.)
1725 Tarball signatures can now be built by running 'make signatures'.
1726 There are also new makefile rules 'tarballs', 'check_public', and
1727 separate makefile rules for each tarball and signature file.
1728 A few makefile rules are now more portable to strict POSIX.
1730 The main web page now lists the canonical IANA URL.
1733 Release 2012h - 2012-10-26 22:49:10 -0700
1735 Bahia no longer has DST. (Thanks to Kelley Cook.)
1737 Tocantins has DST. (Thanks to Rodrigo Severo.)
1739 Israel has new DST rules next year. (Thanks to Ephraim Silverberg.)
1741 Jordan stays on DST this winter. (Thanks to Steffen Thorsen.)
1745 More C modernization, except that at Arthur David Olson's suggestion
1746 the instances of 'register' were kept.
1749 Release 2012g - 2012-10-17 20:59:45 -0700
1751 Samoa fall 2012 and later. (Thanks to Nicholas Pereira and Robert Elz.)
1753 Palestine fall 2012. (Thanks to Steffen Thorsen.)
1757 To attack the version-number problem, this release ships the file
1758 'Makefile' (which contains the release number) in both the tzcode and
1759 the tzdata tarballs. The two Makefiles are identical, and should be
1760 identical in any matching pair of tarballs, so it shouldn't matter
1761 which order you extract the tarballs. Perhaps we can come up with a
1762 better version-number scheme at some point; this scheme does have the
1763 virtue of not adding more files.
1766 Release 2012f - 2012-09-12 23:17:03 -0700
1768 * australasia (Pacific/Fiji): Fiji DST is October 21 through January
1769 20 this year. (Thanks to Steffen Thorsen.)
1772 Release 2012e - 2012-08-02 20:44:55 -0700
1774 * australasia (Pacific/Fakaofo): Tokelau is UTC+13, not UTC+14.
1775 (Thanks to Steffen Thorsen.)
1777 * Use a single version number for both code and data.
1779 * .gitignore: New file.
1781 * Remove trailing white space.
1784 Release code2012c-data2012d - 2012-07-19 16:35:33 -0700
1786 Changes for Morocco's time stamps, which take effect in a couple of
1787 hours, along with infrastructure changes to accommodate how the tz
1788 code and data are released on IANA.
1791 Release data2012c - 2012-03-27 12:17:25 -0400
1794 Summer time changes for Morocco (to start late April 2012)
1797 Changes for 2012 for Gaza & the West Bank (Hebron) and Syria
1800 Haiti following US/Canada rules for 2012 (and we're assuming,
1801 for now anyway, for the future).
1804 Release 2012b - 2012-03-02 12:29:15 +0700
1806 There is just one change to tzcode2012b (compared with 2012a):
1807 the Makefile that was accidentally included with 2012a has been
1808 replaced with the version that should have been there, which is
1809 identical with the previous version (from tzcode2011i).
1811 There are just two changes in tzdata2012b compared with 2012a.
1813 Most significantly, summer time in Cuba has been delayed 3 weeks
1814 (now starts April 1 rather than March 11). Since Mar 11 (the old start
1815 date, as listed in 2012a) is just a little over a week away, this
1818 Less importantly, an excess tab in one of the changes in zone.tab
1819 in 2012a has been removed.
1822 Release 2012a - 2012-03-01 18:28:10 +0700
1824 The changes in tzcode2012a (compared to the previous version, 2011i)
1825 are entirely to the README and tz-art.htm and tz-link.htm files, if
1826 none of those concern you, you can ignore the code update. The changes
1827 reflect the changed addresses for the mailing list and the code and
1828 data distribution points & methods (and a link to DateTime::TimeZone::Tzfile
1829 has been added to tz-link.htm).
1831 In tzdata2012a (compared to the previous release, which was 2011n)
1832 the major changes are:
1833 Chile 2011/2012 and 2012/2013 summer time date adjustments.
1834 Falkland Islands onto permanent summer time (we're assuming for the
1835 foreseeable future, though 2012 is all we're fairly certain of.)
1836 Armenia has abolished Summer Time.
1837 Tokelau jumped the International Date Line back last December
1838 (just the same as their near neighbour, Samoa).
1839 America/Creston is a new zone for a small area of British Columbia
1840 There will be a leapsecond 2012-06-30 23:59:60 UTC.
1842 Other minor changes are:
1843 Corrections to 1918 Canadian summer time end dates.
1844 Updated URL for UK time zone history (in comments)
1845 A few typos in Le Corre's list of free French place names (comments)
1848 Release data2011n - 2011-10-30 14:57:54 +0700
1850 There are three changes of note - most urgently, Cuba (America/Havana)
1851 has extended summer time by two weeks, now to end on Nov 13, rather than
1852 the (already past) Oct 30. Second, the Pridnestrovian Moldavian Republic
1853 (Europe/Tiraspol) decided not to split from the rest of Moldova after
1854 all, and consequently that zone has been removed (again) and reinstated
1855 in the "backward" file as a link to Europe/Chisinau. And third, the
1856 end date for Fiji's summer time this summer was moved forward from the
1857 earlier planned Feb 26, to Jan 22.
1859 Apart from that, Moldova (MD) returns to a single entry in zone.tab
1860 (and the incorrect syntax that was in the 2011m version of that file
1861 is so fixed - it would have been fixed in a different way had this
1862 change not happened - that's the "missing" sccs version id).
1865 Release data2011m - 2011-10-24 21:42:16 +0700
1867 In particular, the typos in comments in the data (2011-11-17 should have
1868 been 2011-10-17 as Alan Barrett noted, and spelling of Tiraspol that
1869 Tim Parenti noted) have been fixed, and the change for Ukraine has been
1870 made in all 4 Ukrainian zones, rather than just Kiev (again, thanks to
1871 Tim Parenti, and also Denys Gavrysh)
1873 In addition, I added Europe/Tiraspol to zone.tab.
1875 This time, all the files have new version numbers... (including the files
1876 otherwise unchanged in 2011m that were changed in 2011l but didn't get new
1877 version numbers there...)
1880 Release data2011l - 2011-10-10 11:15:43 +0700
1882 There are just 2 changes that cause different generated tzdata files from
1883 zic, to Asia/Hebron and Pacific/Fiji - the possible change for Bahia, Brazil
1884 is included, but commented out. Compared with the diff I sent out last week,
1885 this version also includes attributions for the sources for the changes
1886 (in much the same format as ado used, but the html tags have not been
1887 checked, verified, or used in any way at all, so if there are errors there,
1888 please let me know.)
1891 Release data2011k - 2011-09-20 17:54:03 -0400
1896 Release data2011j - 2011-09-12 09:22:49 -0400
1898 (contemporary changes for Samoa; past changes for Kenya, Uganda, and
1899 Tanzania); there are also two spelling corrections to comments in
1900 the australasia file (with thanks to Christos Zoulas).
1903 Release 2011i - 2011-08-29 05:56:32 -0400
1908 Release data2011h - 2011-06-15 18:41:48 -0400
1910 Russia and Curaçao changes
1913 Release 2011g - 2011-04-25 09:07:22 -0400
1915 update the rules for Egypt to reflect its abandonment of DST this year
1918 Release 2011f - 2011-04-06 17:14:53 -0400
1923 Release 2011e - 2011-03-31 16:04:38 -0400
1925 Morocco, Chile, and tz-link changes
1928 Release 2011d - 2011-03-14 09:18:01 -0400
1930 changes that impact present-day time stamps in Cuba, Samoa, and Turkey
1933 Release 2011c - 2011-03-07 09:30:09 -0500
1935 These do affect current time stamps in Chile and Annette Island, Canada.
1938 Release 2011b - 2011-02-07 08:44:50 -0500
1943 Release 2011a - 2011-01-24 10:30:16 -0500
1948 Release data2010o - 2010-11-01 09:18:23 -0400
1950 change to the end of DST in Fiji in 2011
1953 Release 2010n - 2010-10-25 08:19:17 -0400
1958 Release 2010m - 2010-09-27 09:24:48 -0400
1960 Hong Kong, Vostok, and zic.c changes
1963 Release 2010l - 2010-08-16 06:57:25 -0400
1968 Release 2010k - 2010-07-26 10:42:27 -0400
1973 Release 2010j - 2010-05-10 09:07:48 -0400
1975 changes for Bahía de Banderas and for version naming
1978 Release data2010i - 2010-04-16 18:50:45 -0400
1980 the end of DST in Morocco on 2010-08-08
1983 Release data2010h - 2010-04-05 09:58:56 -0400
1988 Release data2010g - 2010-03-24 11:14:53 -0400
1993 Release 2010f - 2010-03-22 09:45:46 -0400
1998 Release data2010e - 2010-03-08 14:24:27 -0500
2000 corrects the Dhaka bug found by Danvin Ruangchan
2003 Release data2010d - 2010-03-06 07:26:01 -0500
2008 Release 2010c - 2010-03-01 09:20:58 -0500
2010 changes including KRE's suggestion for earlier initialization of
2011 "goahead" and "goback" structure elements
2014 Release code2010a - 2010-02-16 10:40:04 -0500
2019 Release data2010b - 2010-01-20 12:37:01 -0500
2024 Release data2010a - 2010-01-18 08:30:04 -0500
2029 Release data2009u - 2009-12-26 08:32:28 -0500
2031 changes to DST in Bangladesh
2034 Release 2009t - 2009-12-21 13:24:27 -0500
2039 Release data2009s - 2009-11-14 10:26:32 -0500
2041 (cosmetic) Antarctica change and the DST-in-Fiji-in-2009-and-2010 change
2044 Release 2009r - 2009-11-09 10:10:31 -0500
2046 "antarctica" and "tz-link.htm" changes
2049 Release 2009q - 2009-11-02 09:12:40 -0500
2051 with two corrections as reported by Eric Muller and Philip Newton
2054 Release data2009p - 2009-10-23 15:05:27 -0400
2056 Argentina (including San Luis) changes (with the correction from
2060 Release data2009o - 2009-10-14 16:49:38 -0400
2062 Samoa (commentary only), Pakistan, and Bangladesh changes
2065 Release data2009n - 2009-09-22 15:13:38 -0400
2067 added commentary for Argentina and a change to the end of DST in
2071 Release data2009m - 2009-09-03 10:23:43 -0400
2073 Samoa and Palestine changes
2076 Release data2009l - 2009-08-14 09:13:07 -0400
2078 Samoa (comments only) and Egypt
2081 Release 2009k - 2009-07-20 09:46:08 -0400
2086 Release data2009j - 2009-06-15 06:43:59 -0400
2088 Bangladesh change (with a short turnaround since the DST change is
2092 Release 2009i - 2009-06-08 09:21:22 -0400
2094 updating for DST in Bangladesh this year
2097 Release 2009h - 2009-05-26 09:19:14 -0400
2102 Release data2009g - 2009-04-20 16:34:07 -0400
2107 Release data2009f - 2009-04-10 11:00:52 -0400
2109 correct DST in Pakistan
2112 Release 2009e - 2009-04-06 09:08:11 -0400
2117 Release 2009d - 2009-03-23 09:38:12 -0400
2119 Morocco, Tunisia, Argentina, and American Astronomical Society changes
2122 Release data2009c - 2009-03-16 09:47:51 -0400
2124 change to the start of Cuban DST
2127 Release 2009b - 2009-02-09 11:15:22 -0500
2132 Release 2009a - 2009-01-21 10:09:39 -0500
2137 Release data2008i - 2008-10-21 12:10:25 -0400
2139 southamerica and zone.tab files, with Argentina DST rule changes and
2140 United States zone reordering and recommenting
2143 Release 2008h - 2008-10-13 07:33:56 -0400
2148 Release 2008g - 2008-10-06 09:03:18 -0400
2150 Fix a broken HTML anchor and update Brazil's DST transitions;
2151 there's also a slight reordering of information in tz-art.htm.
2154 Release data2008f - 2008-09-09 22:33:26 -0400
2159 Release 2008e - 2008-07-28 14:11:17 -0400
2161 changes by Arthur David Olson and Jesper Nørgaard Welen
2164 Release data2008d - 2008-07-07 09:51:38 -0400
2166 changes by Arthur David Olson, Paul Eggert, and Rodrigo Severo
2169 Release data2008c - 2008-05-19 17:48:03 -0400
2171 Pakistan, Morocco, and Mongolia
2174 Release data2008b - 2008-03-24 08:30:59 -0400
2176 including renaming Asia/Calcutta to Asia/Kolkata, with a backward
2180 Release 2008a - 2008-03-08 05:42:16 -0500
2185 Release 2007k - 2007-12-31 10:25:22 -0500
2187 most importantly, changes to the "southamerica" file based on
2188 Argentina's readoption of daylight saving time
2191 Release 2007j - 2007-12-03 09:51:01 -0500
2193 1. eliminate the "P" (parameter) macro;
2195 2. the "noncontroversial" changes circulated on the time zone
2196 mailing list (less the changes to "logwtmp.c");
2198 3. eliminate "too many transition" errors when "min" is used in time
2201 4. changes by Paul Eggert (including updated information for Venezuela).
2204 Release data2007i - 2007-10-30 10:28:11 -0400
2206 changes for Cuba and Syria
2209 Release 2007h - 2007-10-01 10:05:51 -0400
2211 changes by Paul Eggert, as well as an updated link to the ICU
2212 project in tz-link.htm
2215 Release 2007g - 2007-08-20 10:47:59 -0400
2217 changes by Paul Eggert
2219 The "leapseconds" file has been updated to incorporate the most
2220 recent International Earth Rotation and Reference Systems Service
2223 There's an addition to tz-art.htm regarding the television show "Medium".
2226 Release 2007f - 2007-05-07 10:46:46 -0400
2228 changes by Paul Eggert (including Haiti, Turks and Caicos, and New
2231 changes to zic.c to allow hour values greater than 24 (along with
2232 Paul's improved time value overflow checking)
2235 Release 2007e - 2007-04-02 10:11:52 -0400
2237 Syria and Honduras changes by Paul Eggert
2239 zic.c variable renaming changes by Arthur David Olson
2242 Release 2007d - 2007-03-20 08:48:30 -0400
2244 changes by Paul Eggert
2246 the elimination of white space at the ends of lines
2249 Release 2007c - 2007-02-26 09:09:37 -0500
2251 changes by Paul Eggert
2254 Release 2007b - 2007-02-12 09:34:20 -0500
2256 Paul Eggert's proposed change to the quotation handling logic in zic.c.
2258 changes to the commentary in "leapseconds" reflecting the IERS
2259 announcement that there is to be no positive leap second at the end
2263 Release 2007a - 2007-01-08 12:28:29 -0500
2265 changes by Paul Eggert
2267 Derick Rethan's Asmara change
2269 Oscar van Vlijmen's Easter Island local mean time change
2271 symbolic link changes
2274 Release 2006p - 2006-11-27 08:54:27 -0500
2276 changes by Paul Eggert
2279 Release 2006o - 2006-11-06 09:18:07 -0500
2281 changes by Paul Eggert
2284 Release 2006n - 2006-10-10 11:32:06 -0400
2286 changes by Paul Eggert
2289 Release 2006m - 2006-10-02 15:32:35 -0400
2291 changes for Uruguay, Palestine, and Egypt by Paul Eggert
2293 (minimalist) changes to zic.8 to clarify "until" information
2296 Release data2006l - 2006-09-18 12:58:11 -0400
2298 Paul's best-effort work on this coming weekend's Egypt time change
2301 Release 2006k - 2006-08-28 12:19:09 -0400
2303 changes by Paul Eggert
2306 Release 2006j - 2006-08-21 09:56:32 -0400
2308 changes by Paul Eggert
2311 Release code2006i - 2006-08-07 12:30:55 -0400
2315 Ken Pizzini's conversion script
2318 Release code2006h - 2006-07-24 09:19:37 -0400
2320 adds public domain notices to four files
2322 includes a fix for transition times being off by a second
2324 adds a new recording to the "arts" file (information courtesy Colin Bowern)
2327 Release 2006g - 2006-05-08 17:18:09 -0400
2329 northamerica changes by Paul Eggert
2332 Release 2006f - 2006-05-01 11:46:00 -0400
2334 a missing version number problem is fixed (with thanks to Bradley
2335 White for catching the problem)
2338 Release 2006d - 2006-04-17 14:33:43 -0400
2340 changes by Paul Eggert
2342 added new items to tz-arts.htm that were found by Paul
2345 Release 2006c - 2006-04-03 10:09:32 -0400
2347 two sets of data changes by Paul Eggert
2349 a fencepost error fix in zic.c
2351 changes to zic.c and the "europe" file to minimize differences
2352 between output produced by the old 32-bit zic and the new 64-bit
2356 Release 2006b - 2006-02-20 10:08:18 -0500
2357 [tz32code2006b + tz64code2006b + tzdata2006b]
2361 All SCCS IDs were bumped to "8.1" for this release.
2364 Release 2006a - 2006-01-30 08:59:31 -0500
2366 changes by Paul Eggert (in particular, Indiana time zone moves)
2368 an addition to the zic manual page to describe how special-case
2369 transitions are handled
2372 Release 2005r - 2005-12-27 09:27:13 -0500
2374 Canadian changes by Paul Eggert
2376 They also add "<pre>" directives to time zone data files and reflect
2377 changes to warning message logic in "zdump.c" (but with calls to
2378 "gettext" kept unbundled at the suggestion of Ken Pizzini).
2381 Release 2005q - 2005-12-13 09:17:09 -0500
2383 Nothing earth-shaking here:
2384 1. Electronic mail addresses have been removed.
2385 2. Casts of the return value of exit have been removed.
2386 3. Casts of the argument of is.* macros have been added.
2387 4. Indentation in one section of zic.c has been fixed.
2388 5. References to dead URLs in the data files have been dealt with.
2391 Release 2005p - 2005-12-05 10:30:53 -0500
2393 "systemv", "tz-link.htm", and "zdump.c" changes
2394 (less the casts of arguments to the is* macros)
2397 Release 2005o - 2005-11-28 10:55:26 -0500
2399 Georgia, Cuba, Nicaragua, and Jordan changes by Paul Eggert
2401 zdump.c lint fixes by Arthur David Olson
2404 Release 2005n - 2005-10-03 09:44:09 -0400
2406 changes by Paul Eggert (both the Uruguay changes and the Kyrgyzstan
2410 Release 2005m - 2005-08-29 12:15:40 -0400
2412 changes by Paul Eggert (with a small tweak to the tz-art change)
2414 a declaration of an unused variable has been removed from zdump.c
2417 Release 2005l - 2005-08-22 12:06:39 -0400
2419 changes by Paul Eggert
2421 overflow/underflow checks by Arthur David Olson, minus changes to
2422 the "Theory" file about the pending addition of 64-bit data (I grow
2423 less confident of the changes being accepted with each passing day,
2424 and the changes no longer increase the data files nine-fold--there's
2425 less than a doubling in size by my local Sun's reckoning)
2428 Release 2005k - 2005-07-14 14:14:24 -0400
2430 The "leapseconds" file has been edited to reflect the recently
2431 announced leap second at the end of 2005.
2433 I've also deleted electronic mail addresses from the files as an
2437 Release 2005j - 2005-06-13 14:34:13 -0400
2439 These reflect changes to limit the length of time zone abbreviations
2440 and the characters used in those abbreviations.
2442 There are also changes to handle POSIX-style "quoted" time zone
2443 environment variables.
2445 The changes were circulated on the time zone mailing list; the only
2446 change since then was the removal of a couple of minimum-length of
2447 abbreviation checks.
2450 Release data2005i - 2005-04-21 15:04:16 -0400
2452 changes (most importantly to Nicaragua and Haiti) by Paul Eggert
2455 Release 2005h - 2005-04-04 11:24:47 -0400
2457 changes by Paul Eggert
2459 minor changes to Makefile and zdump.c to produce more useful output
2460 when doing a "make typecheck"
2463 Release 2005g - 2005-03-14 10:11:21 -0500
2465 changes by Paul Eggert (a change to current DST rules in Uruguay and
2466 an update to a link to time zone software)
2469 Release 2005f - 2005-03-01 08:45:32 -0500
2471 data and documentation changes by Paul Eggert
2474 Release 2005e - 2005-02-10 15:59:44 -0500
2479 Release code2005d - 2005-01-31 09:21:47 -0500
2481 make zic complain about links to links if the -v flag is used
2483 have "make public" do more code checking
2485 add an include to "localtime.c" for the benefit of gcc systems
2488 Release 2005c - 2005-01-17 18:36:29 -0500
2490 get better results when mktime runs on a system where time_t is double
2492 changes to the data files (most importantly to Paraguay)
2495 Release 2005b - 2005-01-10 09:19:54 -0500
2497 Get localtime and gmtime working on systems with exotic time_t types.
2499 Update the leap second commentary in the "leapseconds" file.
2502 Release 2005a - 2005-01-01 13:13:44 -0500
2507 Release code2004i - 2004-12-14 13:42:58 -0500
2509 Deal with systems where time_t is unsigned.
2512 Release code2004h - 2004-12-07 11:40:18 -0500
2514 64-bit-time_t changes
2517 Release 2004g - 2004-11-02 09:06:01 -0500
2519 update to Cuba (taking effect this weekend)
2521 other changes by Paul Eggert
2523 correction of the spelling of Oslo
2525 changed versions of difftime.c and private.h
2528 Release code2004f - 2004-10-21 10:25:22 -0400
2530 Cope with wide-ranging tm_year values.
2533 Release 2004e - 2004-10-11 14:47:21 -0400
2535 Brazil/Argentina/Israel changes by Paul Eggert
2537 changes to tz-link.htm by Paul
2539 one small fix to Makefile
2542 Release 2004d - 2004-09-22 08:27:29 -0400
2544 Avoid overflow problems when TM_YEAR_BASE is added to an integer.
2547 Release 2004c - 2004-08-11 12:06:26 -0400
2549 asctime-related changes
2551 (variants of) some of the documentation changes suggested by Paul Eggert
2554 Release 2004b - 2004-07-19 14:33:35 -0400
2556 data changes by Paul Eggert - most importantly, updates for Argentina
2559 Release 2004a - 2004-05-27 12:00:47 -0400
2561 changes by Paul Eggert
2563 Handle DST transitions that occur at the end of a month in some
2564 years but at the start of the following month in other years.
2566 Add a copy of the correspondence that's the basis for claims about
2567 DST in the Navajo Nation.
2570 Release 2003e - 2003-12-15 09:36:47 -0500
2572 changes by Arthur David Olson (primarily code changes)
2574 changes by Paul Eggert (primarily data changes)
2576 minor changes to "Makefile" and "northamerica" (in the latter case,
2577 optimization of the "Toronto" rules)
2580 Release 2003d - 2003-10-06 09:34:44 -0400
2582 changes by Paul Eggert
2585 Release 2003c - 2003-09-16 10:47:05 -0400
2587 Fix bad returns in zic.c's inleap function.
2588 Thanks to Bradley White for catching the problem!
2591 Release 2003b - 2003-09-16 07:13:44 -0400
2593 Add a "--version" option (and documentation) to the zic and zdump commands.
2595 changes to overflow/underflow checking in zic
2597 a localtime typo fix.
2599 Update the leapseconds and tz-art.htm files.
2602 Release 2003a - 2003-03-24 09:30:54 -0500
2604 changes by Paul Eggert
2606 a few additions and modifications to the tz-art.htm file
2609 Release 2002d - 2002-10-15 13:12:42 -0400
2611 changes by Paul Eggert, less the "Britain (UK)" change in iso3166.tab
2613 There's also a new time zone quote in "tz-art.htm".
2616 Release 2002c - 2002-04-04 11:55:20 -0500
2618 changes by Paul Eggert
2620 Change zic.c to avoid creating symlinks to files that don't exist.
2623 Release 2002b - 2002-01-28 12:56:03 -0500
2625 [These change notes are for Release 2002a, which was corrupted.
2626 2002b was a corrected version of 2002a.]
2628 changes by Paul Eggert
2630 Update the "leapseconds" file to note that there'll be no leap
2631 second at the end of June, 2002.
2633 Change "zic.c" to deal with a problem in handling the "Asia/Bishkek" zone.
2635 Change to "difftime.c" to avoid sizeof problems.
2638 Release 2001d - 2001-10-09 13:31:32 -0400
2640 changes by Paul Eggert
2643 Release 2001c - 2001-06-05 13:59:55 -0400
2645 changes by Paul Eggert and Andrew Brown
2648 Release 2001b - 2001-04-05 16:44:38 -0400
2650 changes by Paul Eggert (modulo jnorgard's typo fix)
2652 tz-art.htm has been HTMLified.
2655 Release 2001a - 2001-03-13 12:57:44 -0500
2657 changes by Paul Eggert
2659 An addition to the "leapseconds" file: comments with the text of the
2660 latest IERS leap second notice.
2662 Trailing white space has been removed from data file lines, and
2663 repeated spaces in "Rule Jordan" lines in the "asia" file have been
2667 Release 2000h - 2000-12-14 15:33:38 -0500
2669 changes by Paul Eggert
2671 one typo fix in the "art" file
2673 With providence, this is the last update of the millennium.
2676 Release 2000g - 2000-10-10 11:35:22 -0400
2678 changes by Paul Eggert
2680 correction of John Mackin's name submitted by Robert Elz
2682 Garry Shandling's Daylight Saving Time joke (!?!) from the recent
2683 Emmy Awards broadcast.
2686 Release 2000f - 2000-08-10 09:31:58 -0400
2688 changes by Paul Eggert
2690 Added information in "tz-art.htm" on a Seinfeld reference to DST.
2692 Error checking and messages in the "yearistype" script have been
2696 Release 2000e - 2000-07-31 09:27:54 -0400
2698 data changes by Paul Eggert
2700 a change to the default value of the defined constant HAVE_STRERROR
2702 the addition of a Dave Barry quote on DST to the tz-arts file
2705 Release 2000d - 2000-04-20 15:43:04 -0400
2707 changes to the documentation and code of strftime for C99 conformance
2709 a bug fix for date.c
2711 These are based on (though modified from) changes by Paul Eggert.
2714 Release 2000c - 2000-03-04 10:31:43 -0500
2716 changes by Paul Eggert
2719 Release 2000b - 2000-02-21 12:16:29 -0500
2721 changes by Paul Eggert and Joseph Myers
2723 modest tweaks to the tz-art.htm and tz-link.htm files
2726 Release 2000a - 2000-01-18 09:21:26 -0500
2728 changes by Paul Eggert
2730 The two hypertext documents have also been renamed.
2733 Release code1999i-data1999j - 1999-11-15 18:43:22 -0500
2735 Paul Eggert's changes
2737 additions to the "zic" manual page and the "Arts.htm" file
2740 Release code1999h-data1999i - 1999-11-08 14:55:21 -0500
2745 Release data1999h - 1999-10-07 03:50:29 -0400
2747 changes by Paul Eggert to "europe" (most importantly, fixing
2748 Lithuania and Estonia)
2751 Release 1999g - 1999-09-28 11:06:18 -0400
2753 data changes by Paul Eggert (most importantly, the change for
2754 Lebanon that buys correctness for this coming Sunday)
2756 The "code" file contains changes to "Makefile" and "checktab.awk" to
2757 allow better checking of time zone files before they are published.
2760 Release 1999f - 1999-09-23 09:48:14 -0400
2762 changes by Arthur David Olson and Paul Eggert
2765 Release 1999e - 1999-08-17 15:20:54 -0400
2767 changes circulated by Paul Eggert, although the change to handling
2768 of DST-specifying time zone names has been commented out for now
2769 (search for "XXX" in "localtime.c" for details). These files also
2770 do not make any changes to the start of DST in Brazil.
2772 In addition to Paul's changes, there are updates to "Arts.htm" and
2776 Release 1999d - 1999-03-30 11:31:07 -0500
2778 changes by Paul Eggert
2780 The Makefile's "make public" rule has also been changed to do a test
2781 compile of each individual time zone data file (which should help
2782 avoid problems such as the one we had with Nicosia).
2785 Release 1999c - 1999-03-25 09:47:47 -0500
2787 changes by Paul Eggert, most importantly the change for Chile.
2790 Release 1999b - 1999-02-01 17:51:44 -0500
2792 changes by Paul Eggert
2794 code changes (suggested by Mani Varadarajan, mani at be.com) for
2795 correct handling of symbolic links when building using a relative directory
2797 code changes to generate correct messages for failed links
2799 updates to the URLs in Arts.htm
2802 Release 1999a - 1999-01-19 16:20:29 -0500
2804 error message internationalizations and corrections in zic.c and
2805 zdump.c (as suggested by Vladimir Michl, vladimir.michl at upol.cz,
2809 Release code1998h-data1998i - 1998-10-01 09:56:10 -0400
2811 changes for Brazil, Chile, and Germany
2813 support for use of "24:00" in the input files for the time zone compiler
2816 Release code1998g-data1998h - 1998-09-24 10:50:28 -0400
2818 changes by Paul Eggert
2820 correction to a define in the "private.h" file
2823 Release data1998g - 1998-08-11 03:28:35 -0000
2824 [tzdata1998g.tar.gz is missing!]
2826 Lithuanian change provided by mgedmin at pub.osf.it
2828 Move creation of the GMT link with Etc/GMT to "etcetera" (from
2829 "backward") to ensure that the GMT file is created even where folks
2830 don't want the "backward" links (as suggested by Paul Eggert).
2833 Release data1998f - 1998-07-20 13:50:00 -0000
2834 [tzdata1998f.tar.gz is missing!]
2836 Update the "leapseconds" file to include the newly-announced
2837 insertion at the end of 1998.
2840 Release code1998f - 1998-06-01 10:18:31 -0400
2842 addition to localtime.c by Guy Harris
2845 Release 1998e - 1998-05-28 09:56:26 -0400
2847 The Makefile is changed to produce zoneinfo-posix rather than
2848 zoneinfo/posix, and to produce zoneinfo-leaps rather than
2851 data changes by Paul Eggert
2853 changes from Guy Harris to provide asctime_r and ctime_r
2855 A usno1998 file (substantially identical to usno1997) has been added.
2858 Release 1998d - 1998-05-14 11:58:34 -0400
2860 changes to comments (in particular, elimination of references to CIA maps).
2861 "Arts.htm", "WWW.htm", "asia", and "australasia" are the only places
2862 where changes occur.
2865 Release 1998c - 1998-02-28 12:32:26 -0500
2867 changes by Paul Eggert (save the "French correction," on which I'll
2868 wait for the dust to settle)
2872 changes and additions to Arts.htm
2875 Release 1998b - 1998-01-17 14:31:51 -0500
2877 URL cleanups and additions
2880 Release 1998a - 1998-01-13 12:37:35 -0500
2882 changes by Paul Eggert
2885 Release code1997i-data1997k - 1997-12-29 09:53:41 -0500
2887 changes by Paul Eggert, with minor modifications from Arthur David
2888 Olson to make the files more browser friendly
2891 Release code1997h-data1997j - 1997-12-18 17:47:35 -0500
2893 minor changes to put "TZif" at the start of each time zone information file
2895 a rule has also been added to the Makefile so you can
2897 to just recompile the zone information files (rather than doing a
2898 full "make install" with its other effects).
2901 Release data1997i - 1997-10-07 08:45:38 -0400
2903 changes to Africa by Paul Eggert
2906 Release code1997g-data1997h - 1997-09-04 16:56:54 -0400
2908 corrections for Uruguay (and other locations)
2910 Arthur David Olson's simple-minded fix allowing mktime to both
2911 correctly handle leap seconds and correctly handle tm_sec values
2912 upon which arithmetic has been performed.
2915 Release code1997f-data1997g - 1997-07-19 13:15:02 -0400
2917 Paul Eggert's updates
2919 a small change to a function prototype;
2921 "Music" has been renamed "Arts.htm", HTMLified, and augmented to
2922 include information on Around the World in Eighty Days.
2925 Release code1997e-data1997f - 1997-05-03 18:52:34 -0400
2927 fixes to zic's error handling
2929 changes inspired by the item circulated on Slovenia
2931 The description of Web resources has been HTMLified for browsing
2934 A new piece of tz-related music has been added to the "Music" file.
2937 Release code1997d-data1997e - 1997-03-29 12:48:52 -0500
2939 Paul Eggert's latest suggestions
2942 Release code1997c-data1997d - 1997-03-07 20:37:54 -0500
2944 changes to "zic.c" to correct performance of the "-s" option
2946 a new file "usno1997"
2949 Release data1997c - 1997-03-04 09:58:18 -0500
2954 Release 1997b - 1997-02-27 18:34:19 -0500
2956 The data file incorporates the 1997 leap second.
2958 The code file incorporates Arthur David Olson's take on the
2959 zic/multiprocessor/directory-creation situation.
2962 Release 1997a - 1997-01-21 09:11:10 -0500
2964 Paul Eggert's Antarctica (and other changes)
2966 Arthur David Olson finessed the "getopt" issue by checking against
2967 both -1 and EOF (regardless of POSIX, SunOS 4.1.1's manual says -1
2968 is returned while SunOS 5.5's manual says EOF is returned).
2971 Release code1996o-data1996n - 1996-12-27 21:42:05 -0500
2973 Paul Eggert's latest changes
2976 Release code1996n - 1996-12-16 09:42:02 -0500
2978 link snapping fix from Bruce Evans (via Garrett Wollman)
2981 Release data1996m - 1996-11-24 02:37:34 -0000
2982 [tzdata1996m.tar.gz is missing!]
2984 Paul Eggert's batch of changes
2987 Release code1996m-data1996l - 1996-11-05 14:00:12 -0500
2989 No functional changes here; the files have simply been changed to
2990 make more use of ISO style dates in comments. The names of the above
2991 files now include the year in full.
2994 Release code96l - 1996-09-08 17:12:20 -0400
2996 tzcode96k was missing a couple of pieces.
2999 Release 96k - 1996-09-08 16:06:22 -0400
3001 the latest round of changes from Paul Eggert
3003 the recent Year 2000 material
3006 Release code96j - 1996-07-30 13:18:53 -0400
3008 Set sp->typecnt as suggested by Timothy Patrick Murphy.
3011 Release code96i - 1996-07-27 20:11:35 -0400
3013 Paul's suggested patch for strftime %V week numbers
3016 Release data96i - 1996-07-01 18:13:04 -0400
3018 "northamerica" and "europe" changes by Paul Eggert
3021 Release code96h - 1996-06-05 08:02:21 -0400
3023 fix for handling transitions specified in Universal Time
3025 Some "public domain" notices have also been added.
3028 Release code96g - 1996-05-16 14:00:26 -0400
3030 fix for the simultaneous-DST-and-zone-change challenge
3033 Release data96h - 1996-05-09 17:40:51 -0400
3035 changes by Paul Eggert
3038 Release code96f-data96g - 1996-05-03 03:09:59 -0000
3039 [tzcode96f.tar.gz + tzdata96g.tar.gz are both missing!]
3041 The changes get us some of the way to fixing the problems noted in Paul
3042 Eggert's letter yesterday (in addition to a few others). The approach
3043 has been to make zic a bit smarter about figuring out what time zone
3044 abbreviations apply just after the time specified in the "UNTIL" part
3045 of a zone line. Putting the smarts in zic means avoiding having
3046 transition times show up in both "Zone" lines and "Rule" lines, which
3047 in turn avoids multiple transition time entries in time zone files.
3048 (This also makes the zic input files such as "europe" a bit shorter and
3049 should ease maintenance.)
3052 Release data96f - 1996-04-19 19:20:03 -0000
3053 [tzdata96f.tar.gz is missing!]
3055 The only changes are to the "northamerica" file; the time zone
3056 abbreviation for Denver is corrected to MST (and MDT), and the
3057 comments for Mexico have been updated.
3060 Release data96e - 1996-03-19 17:37:26 -0500
3062 Proposals by Paul Eggert, in particular the Portugal change that
3063 comes into play at the end of this month.
3066 Release data96d - 1996-03-18 20:49:39 -0500
3071 Release code96e - 1996-02-29 15:43:27 -0000
3072 [tzcode96e.tar.gz is missing!]
3074 internationalization changes and the fix to the documentation for strftime
3077 Release code96d-data96c - 1996-02-12 11:05:27 -0500
3079 The "code" file simply updates Bob Kridle's electronic address.
3081 The "data" file updates rules for Mexico.
3084 Release data96b - 1996-01-27 15:44:42 -0500
3089 Release code96c - 1996-01-16 16:58:15 -0500
3091 leap-year streamlining and binary-search changes
3096 Release code96b - 1996-01-10 20:42:39 -0500
3098 fixes and enhancements from Paul Eggert, including code that
3099 emulates the behavior of recent versions of the SunOS "date"
3103 Release 96a - 1996-01-06 09:08:24 -0500
3107 fixes to strftime.c for correct ISO 8601 week number generation,
3108 plus support for two new formats ('G' and 'g') to give ISO 8601 year
3109 numbers (which are not necessarily the same as calendar year numbers)
3112 Release code95i-data95m - 1995-12-21 12:46:47 -0500
3114 The latest revisions from Paul Eggert are included, the usno1995
3115 file has been updated, and a new file ("WWW") covering useful URLs
3119 Release code95h-data95l - 1995-12-19 18:10:12 -0500
3121 A simplification of a macro definition, a change to data for Sudan,
3122 and (for last minute shoppers) notes in the "Music" file on the CD
3126 Release code95g-data95k - 1995-10-30 10:32:47 -0500
3128 (slightly reformatted) 8-bit-clean proposed patch
3130 minor patch: US/Eastern -> America/New_York
3132 snapshot of the USNO's latest data ("usno1995")
3134 some other minor cleanups
3137 Release code95f-data95j - 1995-10-28 21:01:34 -0000
3138 [tzcode95f.tar.gz + tzdata95j.tar.gz are both missing!]
3142 support for 64-bit time_t's
3144 optimization in localtime.c
3147 Release code95e - 1995-10-13 13:23:57 -0400
3149 the mktime change to scan from future to past when trying to find time zone
3153 Release data95i - 1995-09-26 10:43:26 -0400
3155 For Canada/Central, guess that the Sun customer's "one week too
3156 early" was just a approximation, and the true error is one month
3157 too early. This is consistent with the rest of Canada.
3160 Release data95h - 1995-09-21 11:26:48 -0400
3162 latest changes from Paul Eggert
3165 Release code95d - 1995-09-14 11:14:45 -0400
3167 the addition of a "Music" file, which documents four recorded
3168 versions of the tune "Save That Time".
3171 Release data95g - 1995-09-01 17:21:36 -0400
3173 "yearistype" correction
3176 Release data95f - 1995-08-28 20:46:56 -0400
3178 Paul Eggert's change to the australasia file
3181 Release data95e - 1995-07-08 18:02:34 -0400
3183 The only change is a leap second at the end of this year.
3184 Thanks to Bradley White for forwarding news on the leap second.
3187 Release data95d - 1995-07-03 13:26:22 -0400
3189 Paul Eggert's changes
3192 Release data95c - 1995-07-02 19:19:28 -0400
3194 changes to "asia", "backward", "europe", and "southamerica"
3195 (read: northamericacentrics need not apply)
3198 Release code95c - 1995-03-13 14:00:46 -0500
3200 one-line fix for sign extension problems in detzcode
3203 Release 95b - 1995-03-04 11:22:38 -0500
3205 Minor changes in both:
3207 The "code" file contains a workaround for the lack of "unistd.h" in
3208 Microsoft C++ version 7.
3210 The "data" file contains a fixed "Link" for America/Shiprock.
3213 Release 94h - 1994-12-10 12:51:14 -0500
3217 * incorporate the changes to "zdump" and "date" to make changes to
3218 the "TZ" environment variable permanent;
3220 * incorporate the table changes by Paul Eggert;
3222 * include (and document) support for universal time specifications in
3223 data files - but do not (yet) include use of this feature in the
3226 Think of this as "TZ Classic" - the software has been set up not to break if
3227 universal time shows up in its input, and data entries have been
3228 left as is so as not to break existing implementations.
3231 Release data94f - 1994-08-20 12:56:09 -0400
3233 (with thanks!) the latest data updates from Paul Eggert
3236 Release data94e - 1994-06-04 13:13:53 -0400
3241 Release code94g - 1994-05-05 12:14:07 -0400
3243 fix missing "optind.c" and a reference to it in the Makefile
3246 Release code94f - 1994-05-05 13:00:33 -0000
3247 [tzcode94f.tar.gz is missing!]
3249 changes to avoid overflow in difftime, as well as changes to cope
3250 with the 52/53 challenge in strftime
3253 Release code94e - 1994-03-30 23:32:59 -0500
3255 change for the benefit of PCTS
3258 Release 94d - 1994-02-24 15:42:25 -0500
3260 Avoid clashes with POSIX semantics for zones such as GMT+4.
3262 Some other very minor housekeeping is also present.
3265 Release code94c - 1994-02-10 08:52:40 -0500
3267 Fix bug where mkdirs was broken unless you compile with
3268 -fwritable-strings (which is generally losing to do).
3271 Release 94b - 1994-02-07 10:04:33 -0500
3273 work by Paul Eggert who notes:
3275 I found another book of time zone histories by E W Whitman; it's not
3276 as extensive as Shanks but has a few goodies of its own. I used it
3277 to update the tables. I also fixed some more as a result of
3278 correspondence with Adam David and Peter Ilieve, and move some stray
3279 links from 'europe' to 'backward'. I corrected some scanning errors
3282 As far as the code goes, I fixed zic to allow years in the range
3283 INT_MIN to INT_MAX; this fixed a few boundary conditions around 1900.
3284 And I cleaned up the zic documentation a little bit.
3287 Release data94a - 1994-02-03 08:58:54 -0500
3289 It simply incorporates the recently announced leap second into the
3293 Release 93g - 1993-11-22 17:28:27 -0500
3295 Paul Eggert has provided a good deal of historic information (based
3296 on Shanks), and there are some code changes to deal with the buglets
3297 that crawled out in dealing with the new information.
3300 Release 93f - 1993-10-15 12:27:46 -0400
3302 Paul Eggert's changes
3305 Release 93e - 1993-09-05 21:21:44 -0400
3307 This has updated data for Israel, England, and Kwajalein. There's
3308 also an update to "zdump" to cope with Kwajalein's 24-hour jump.
3309 Thanks to Paul Eggert and Peter Ilieve for the changes.
3312 Release 93d - 1993-06-17 23:34:17 -0400
3314 new fix and new data on Israel
3317 Release 93c - 1993-06-06 19:31:55 -0400
3322 Release 93b - 1993-02-02 14:53:58 -0500
3324 updated "leapseconds" file
3327 Release 93 - 1993-01-08 07:01:06 -0500
3329 At kre's suggestion, the package has been split in two - a code piece
3330 (which also includes documentation) that's only of use to folks who
3331 want to recompile things and a data piece useful to anyone who can
3334 The new version has a few changes to the data files, a few
3335 portability changes, and an off-by-one fix (with thanks to
3336 Tom Karzes at deshaw.com for providing a description and a
3340 Release 92c - 1992-11-21 17:35:36 -0000
3341 [tz92c.tar.Z is missing!]
3343 The fallout from the latest round of DST transitions.
3345 There are changes for Portugal, Saskatchewan, and "Pacific-New";
3346 there's also a change to "zic.c" that makes it portable to more systems.
3349 Release 92 - 1992-04-25 18:17:03 -0000
3350 [tz92.tar.Z is missing!]
3352 By popular demand (well, at any rate, following a request by kre at munnari)
3355 The 1989 update of the time zone package featured:
3357 * POSIXization (including interpretation of POSIX-style TZ environment
3358 variables, provided by Guy Harris),
3359 * ANSIfication (including versions of "mktime" and "difftime"),
3360 * SVIDulation (an "altzone" variable)
3361 * MACHination (the "gtime" function)
3362 * corrections to some time zone data (including corrections to the rules
3363 for Great Britain and New Zealand)
3364 * reference data from the United States Naval Observatory for folks who
3365 want to do additional time zones
3366 * and the 1989 data for Saudi Arabia.
3368 (Since this code will be treated as "part of the implementation" in some
3369 places and as "part of the application" in others, there's no good way to
3370 name functions, such as timegm, that are not part of the proposed ANSI C
3371 standard; such functions have kept their old, underscore-free names in this
3374 And the "dysize" function has disappeared; it was present to allow
3375 compilation of the "date" command on old BSD systems, and a version of "date"
3376 is now provided in the package. The "date" command is not created when you
3377 "make all" since it may lack options provided by the version distributed with
3378 your operating system, or may not interact with the system in the same way
3379 the native version does.
3381 Since POSIX frowns on correct leap second handling, the default behavior of
3382 the "zic" command (in the absence of a "-L" option) has been changed to omit
3383 leap second information from its output files.
3389 This file contains copies of the part of each release announcement
3390 that talks about the changes in that release. The text has been
3391 adapted and reformatted for the purposes of this file.
3393 Typically a release R consists of a pair of tarball files,
3394 tzcodeR.tar.gz and tzdataR.tar.gz. However, some releases (e.g.,
3395 code2010a, data2012c) consist of just one or the other tarball, and a
3396 few (e.g., code2012c-data2012d) have tarballs with mixed version
3399 Release time stamps are taken from the release's commit (for newer,
3400 git releases), from the newest file in the tarball (for older
3401 releases, where this info is available) or from the email announcing
3402 the release (if all else fails; these are marked with a time zone of
3403 -0000 and an "is missing!" comment).
3405 Earlier versions of the code and data were not announced on the tz
3406 list and are not summarized here.
3408 This file is in the public domain.