1 News for the tz database
3 Release 2015d - 2015-04-24 08:09:46 -0700
5 Changes affecting future time stamps
7 Egypt will not observe DST in 2015 and will consider canceling it
8 permanently. For now, assume no DST indefinitely.
9 (Thanks to Ahmed Nazmy and Tim Parenti.)
11 Changes affecting past time stamps
13 America/Whitehorse switched from UTC-9 to UTC-8 on 1967-05-28, not
14 1966-07-01. Also, Yukon's time zone history is documented better.
15 (Thanks to Brian Inglis and Dennis Ferguson.)
17 Change affecting past and future time zone abbreviations
19 The abbreviations for Hawaii-Aleutian standard and daylight times
20 have been changed from HAST/HADT to HST/HDT, as per US Government
21 Printing Office style. This affects only America/Adak since 1983,
22 as America/Honolulu was already using the new style.
24 Changes affecting code
26 zic has some minor performance improvements.
29 Release 2015c - 2015-04-11 08:55:55 -0700
31 Changes affecting future time stamps
33 Egypt's spring-forward transition is at 24:00 on April's last Thursday,
34 not 00:00 on April's last Friday. 2015's transition will therefore be on
35 Thursday, April 30 at 24:00, not Friday, April 24 at 00:00. Similar fixes
36 apply to 2026, 2037, 2043, etc. (Thanks to Steffen Thorsen.)
38 Changes affecting past time stamps
40 The following changes affect some pre-1991 Chile-related time stamps
41 in America/Santiago, Antarctica/Palmer, and Pacific/Easter.
43 The 1910 transition was January 10, not January 1.
45 The 1918 transition was September 10, not September 1.
47 The UTC-4 time observed from 1932 to 1942 is now considered to be
48 standard time, not year-round DST.
50 Santiago observed DST (UTC-3) from 1946-07-15 through 1946-08-31,
51 then reverted to standard time, then switched its time zone to
54 Assume transitions before 1968 were at 00:00, since we have no data
57 The spring 1988 transition was 1988-10-09, not 1988-10-02.
58 The fall 1990 transition was 1990-03-11, not 1990-03-18.
60 Assume no UTC offset change for Pacific/Easter on 1890-01-01,
61 and omit all transitions on Pacific/Easter from 1942 through 1946
62 since we have no data suggesting that they existed.
64 One more zone has been turned into a link, as it differed
65 from an existing zone only for older time stamps. As usual,
66 this change affects UTC offsets in pre-1970 time stamps only.
67 The zone's old contents have been moved to the 'backzone' file.
68 The affected zone is America/Montreal.
70 Changes affecting commentary
72 Mention the TZUpdater tool.
74 Mention "The Time Now". (Thanks to Brandon Ramsey.)
77 Release 2015b - 2015-03-19 23:28:11 -0700
79 Changes affecting future time stamps
81 Mongolia will start observing DST again this year, from the last
82 Saturday in March at 02:00 to the last Saturday in September at 00:00.
83 (Thanks to Ganbold Tsagaankhuu.)
85 Palestine will start DST on March 28, not March 27. Also,
86 correct the fall 2014 transition from September 26 to October 24.
87 Adjust future predictions accordingly. (Thanks to Steffen Thorsen.)
89 Changes affecting past time stamps
91 The 1982 zone shift in Pacific/Easter has been corrected, fixing a 2015a
92 regression. (Thanks to Stuart Bishop for reporting the problem.)
94 Some more zones have been turned into links, when they differed
95 from existing zones only for older time stamps. As usual,
96 these changes affect UTC offsets in pre-1970 time stamps only.
97 Their old contents have been moved to the 'backzone' file.
98 The affected zones are: America/Antigua, America/Cayman,
99 Pacific/Midway, and Pacific/Saipan.
101 Changes affecting time zone abbreviations
103 Correct the 1992-2010 DST abbreviation in Volgograd from "MSK" to "MSD".
106 Changes affecting code
108 Fix integer overflow bug in reference 'mktime' implementation.
109 (Problem reported by Jörg Richter.)
111 Allow -Dtime_tz=time_t compilations, and allow -Dtime_tz=... libraries
112 to be used in the same executable as standard-library time_t functions.
113 (Problems reported by Bradley White.)
115 Changes affecting commentary
117 Cite the recent Mexican decree changing Quintana Roo's time zone.
118 (Thanks to Carlos Raúl Perasso.)
120 Likewise for the recent Chilean decree. (Thanks to Eduardo Romero Urra.)
122 Update info about Mars time.
125 Release 2015a - 2015-01-29 22:35:20 -0800
127 Changes affecting future time stamps
129 The Mexican state of Quintana Roo, represented by America/Cancun,
130 will shift from Central Time with DST to Eastern Time without DST
131 on 2015-02-01 at 02:00. (Thanks to Steffen Thorsen and Gwillim Law.)
133 Chile will not change clocks in April or thereafter; its new standard time
134 will be its old daylight saving time. This affects America/Santiago,
135 Pacific/Easter, and Antarctica/Palmer. (Thanks to Juan Correa.)
137 New leap second 2015-06-30 23:59:60 UTC as per IERS Bulletin C 49.
138 (Thanks to Tim Parenti.)
140 Changes affecting past time stamps
142 Iceland observed DST in 1919 and 1921, and its 1939 fallback
143 transition was Oct. 29, not Nov. 29. Remove incorrect data from
144 Shanks about time in Iceland between 1837 and 1908.
146 Some more zones have been turned into links, when they differed
147 from existing zones only for older time stamps. As usual,
148 these changes affect UTC offsets in pre-1970 time stamps only.
149 Their old contents have been moved to the 'backzone' file.
150 The affected zones are: Asia/Aden, Asia/Bahrain, Asia/Kuwait,
153 Changes affecting code
155 tzalloc now scrubs time zone abbreviations compatibly with the way
156 that tzset always has, by replacing invalid bytes with '_' and by
157 shortening too-long abbreviations.
159 tzselect ports to POSIX awk implementations, no longer mishandles
160 POSIX TZ settings when GNU awk is used, and reports POSIX TZ
161 settings to the user. (Thanks to Stefan Kuhn.)
163 Changes affecting build procedure
165 'make check' now checks for links to links in the data.
166 One such link (for Africa/Asmera) has been fixed.
167 (Thanks to Stephen Colebourne for pointing out the problem.)
169 Changes affecting commentary
171 The leapseconds file commentary now mentions the expiration date.
172 (Problem reported by Martin Burnicki.)
174 Update Mexican Library of Congress URL.
177 Release 2014j - 2014-11-10 17:37:11 -0800
179 Changes affecting current and future time stamps
181 Turks & Caicos' switch from US eastern time to UTC-4 year-round
182 did not occur on 2014-11-02 at 02:00. It's currently scheduled
183 for 2015-11-01 at 02:00. (Thanks to Chris Walton.)
185 Changes affecting past time stamps
187 Many pre-1989 time stamps have been corrected for Asia/Seoul and
188 Asia/Pyongyang, based on sources for the Korean-language Wikipedia
189 entry for time in Korea. (Thanks to Sanghyuk Jung.) Also, no
190 longer guess that Pyongyang mimicked Seoul time after World War II,
191 as this is politically implausible.
193 Some more zones have been turned into links, when they differed
194 from existing zones only for older time stamps. As usual,
195 these changes affect UTC offsets in pre-1970 time stamps only.
196 Their old contents have been moved to the 'backzone' file.
197 The affected zones are: Africa/Addis_Ababa, Africa/Asmara,
198 Africa/Dar_es_Salaam, Africa/Djibouti, Africa/Kampala,
199 Africa/Mogadishu, Indian/Antananarivo, Indian/Comoro, and
202 Changes affecting commentary
204 The commentary is less enthusiastic about Shanks as a source,
205 and is more careful to distinguish UT from UTC.
208 Release 2014i - 2014-10-21 22:04:57 -0700
210 Changes affecting future time stamps
212 Pacific/Fiji will observe DST from 2014-11-02 02:00 to 2015-01-18 03:00.
213 (Thanks to Ken Rylander for the heads-up.) Guess that future
214 years will use a similar pattern.
216 A new Zone Pacific/Bougainville, for the part of Papua New Guinea
217 that plans to switch from UTC+10 to UTC+11 on 2014-12-28 at 02:00.
218 (Thanks to Kiley Walbom for the heads-up.)
220 Changes affecting time zone abbreviations
222 Since Belarus is not changing its clocks even though Moscow is,
223 the time zone abbreviation in Europe/Minsk is changing from FET
224 to its more-traditional value MSK on 2014-10-26 at 01:00.
225 (Thanks to Alexander Bokovoy for the heads-up about Belarus.)
227 The new abbreviation IDT stands for the pre-1976 use of UT+8 in
228 Indochina, to distinguish it better from ICT (UT+7).
230 Changes affecting past time stamps
232 Many time stamps have been corrected for Asia/Ho_Chi_Minh before 1976
233 (thanks to Trần Ngọc Quân for an indirect pointer to Trần Tiến Bình's
234 authoritative book). Asia/Ho_Chi_Minh has been added to
235 zone1970.tab, to give tzselect users in Vietnam two choices,
236 since north and south Vietnam disagreed after our 1970 cutoff.
238 Asia/Phnom_Penh and Asia/Vientiane have been turned into links, as
239 they differed from existing zones only for older time stamps. As
240 usual, these changes affect pre-1970 time stamps only. Their old
241 contents have been moved to the 'backzone' file.
243 Changes affecting code
245 The time-related library functions now set errno on failure, and
246 some crashes in the new tzalloc-related library functions have
247 been fixed. (Thanks to Christos Zoulas for reporting most of
248 these problems and for suggesting fixes.)
250 If USG_COMPAT is defined and the requested time stamp is standard time,
251 the tz library's localtime and mktime functions now set the extern
252 variable timezone to a value appropriate for that time stamp; and
253 similarly for ALTZONE, daylight saving time, and the altzone variable.
254 This change is a companion to the tzname change in 2014h, and is
255 designed to make timezone and altzone more compatible with tzname.
257 The tz library's functions now set errno to EOVERFLOW if they fail
258 because the result cannot be represented. ctime and ctime_r now
259 return NULL and set errno when a time stamp is out of range, rather
260 than having undefined behavior.
262 Some bugs associated with the new 2014g functions have been fixed.
263 This includes a bug that largely incapacitated the new functions
264 time2posix_z and posix2time_z. (Thanks to Christos Zoulas.)
265 It also includes some uses of uninitialized variables after tzalloc.
266 The new code uses the standard type 'ssize_t', which the Makefile
267 now gives porting advice about.
269 Changes affecting commentary
271 Updated URLs for NRC Canada (thanks to Matt Johnson and Brian Inglis).
274 Release 2014h - 2014-09-25 18:59:03 -0700
276 Changes affecting past time stamps
278 America/Jamaica's 1974 spring-forward transition was Jan. 6, not Apr. 28.
280 Shanks says Asia/Novokuznetsk switched from LMT (not "NMT") on 1924-05-01,
281 not 1920-01-06. The old entry was based on a misinterpretation of Shanks.
283 Some more zones have been turned into links, when they differed
284 from existing zones only for older time stamps. As usual,
285 these changes affect UTC offsets in pre-1970 time stamps only.
286 Their old contents have been moved to the 'backzone' file.
287 The affected zones are: Africa/Blantyre, Africa/Bujumbura,
288 Africa/Gaborone, Africa/Harare, Africa/Kigali, Africa/Lubumbashi,
289 Africa/Lusaka, Africa/Maseru, and Africa/Mbabane.
291 Changes affecting code
293 zdump -V and -v now output gmtoff= values on all platforms,
294 not merely on platforms defining TM_GMTOFF.
296 The tz library's localtime and mktime functions now set tzname to a value
297 appropriate for the requested time stamp, and zdump now uses this
298 on platforms not defining TM_ZONE, fixing a 2014g regression.
299 (Thanks to Tim Parenti for reporting the problem.)
301 The tz library no longer sets tzname if localtime or mktime fails.
303 zdump -c no longer mishandles transitions near year boundaries.
304 (Thanks to Tim Parenti for reporting the problem.)
306 An access to uninitalized data has been fixed.
307 (Thanks to Jörg Richter for reporting the problem.)
309 When THREAD_SAFE is defined, the code ports to the C11 memory model.
310 A memory leak has been fixed if ALL_STATE and THREAD_SAFE are defined
311 and two threads race to initialize data used by gmtime-like functions.
312 (Thanks to Andy Heninger for reporting the problems.)
314 Changes affecting build procedure
316 'make check' now checks better for properly-sorted data.
318 Changes affecting documentation and commentary
320 zdump's gmtoff=N output is now documented, and its isdst=D output
321 is now documented to possibly output D values other than 0 or 1.
323 zdump -c's treatment of years is now documented to use the
324 Gregorian calendar and Universal Time without leap seconds,
325 and its behavior at cutoff boundaries is now documented better.
326 (Thanks to Arthur David Olson and Tim Parenti for reporting the problems.)
328 Programs are now documented to use the proleptic Gregorian calendar.
329 (Thanks to Alan Barrett for the suggestion.)
331 Fractional-second GMT offsets have been documented for civil time
332 in 19th-century Chennai, Jakarta, and New York.
335 Release 2014g - 2014-08-28 12:31:23 -0700
337 Changes affecting future time stamps
339 Turks & Caicos is switching from US eastern time to UTC-4 year-round,
340 modeled as a switch from EST/EDT to AST on 2014-11-02 at 02:00.
341 [As noted in 2014j, this switch was later delayed.]
343 Changes affecting past time stamps
345 Time in Russia or the USSR before 1926 or so has been corrected by
346 a few seconds in the following zones: Asia/Irkutsk,
347 Asia/Krasnoyarsk, Asia/Omsk, Asia/Samarkand, Asia/Tbilisi,
348 Asia/Vladivostok, Asia/Yakutsk, Europe/Riga, Europe/Samara. For
349 Asia/Yekaterinburg the correction is a few minutes. (Thanks to
352 The Portuguese decree of 1911-05-26 took effect on 1912-01-01.
353 This affects 1911 time stamps in Africa/Bissau, Africa/Luanda,
354 Atlantic/Azores, and Atlantic/Madeira. Also, Lisbon's pre-1912
355 GMT offset was -0:36:45 (rounded from -0:36:44.68), not -0:36:32.
356 (Thanks to Stephen Colebourne for pointing to the decree.)
358 Asia/Dhaka ended DST on 2009-12-31 at 24:00, not 23:59.
360 A new file 'backzone' contains data which may appeal to
361 connoisseurs of old time stamps, although it is out of scope for
362 the tz database, is often poorly sourced, and contains some data
363 that is known to be incorrect. The new file is not recommended
364 for ordinary use and its entries are not installed by default.
365 (Thanks to Lester Caine for the high-quality Jersey, Guernsey, and
366 Isle of Man entries.)
368 Some more zones have been turned into links, when they differed
369 from existing zones only for older time stamps. As usual,
370 these changes affect UTC offsets in pre-1970 time stamps only.
371 Their old contents have been moved to the 'backzone' file.
372 The affected zones are: Africa/Bangui, Africa/Brazzaville,
373 Africa/Douala, Africa/Kinshasa, Africa/Libreville, Africa/Luanda,
374 Africa/Malabo, Africa/Niamey, and Africa/Porto-Novo.
376 Changes affecting code
378 Unless NETBSD_INSPIRED is defined to 0, the tz library now
379 supplies functions for creating and using objects that represent
380 time zones. The new functions are tzalloc, tzfree, localtime_rz,
381 mktime_z, and (if STD_INSPIRED is also defined) posix2time_z and
382 time2posix_z. They are intended for performance: for example,
383 localtime_rz (unlike localtime_r) is trivially thread-safe without
384 locking. (Thanks to Christos Zoulas for proposing NetBSD-inspired
385 functions, and to Alan Barrett and Jonathan Lennox for helping to
388 zdump now builds with the tz library unless USE_LTZ is defined to 0,
389 This lets zdump use tz features even if the system library lacks them.
390 To build zdump with the system library, use 'make CFLAGS=-DUSE_LTZ=0
391 TZDOBJS=zdump.o CHECK_TIME_T_ALTERNATIVES='.
393 zdump now uses localtime_rz if available, as it's significantly faster,
394 and it can help zdump better diagnose invalid time zone names.
395 Define HAVE_LOCALTIME_RZ to 0 to suppress this. HAVE_LOCALTIME_RZ
396 defaults to 1 if NETBSD_INSPIRED && USE_LTZ. When localtime_rz is
397 not available, zdump now uses localtime_r and tzset if available,
398 as this is a bit cleaner and faster than plain localtime. Compile
399 with -DHAVE_LOCALTIME_R=0 and/or -DHAVE_TZSET=0 if your system
400 lacks these two functions.
402 If THREAD_SAFE is defined to 1, the tz library is now thread-safe.
403 Although not needed for tz's own applications, which are single-threaded,
404 this supports POSIX better if the tz library is used in multithreaded apps.
406 Some crashes have been fixed when zdump or the tz library is given
407 invalid or outlandish input.
409 The tz library no longer mishandles leap seconds on platforms with
410 unsigned time_t in time zones that lack ordinary transitions after 1970.
412 The tz code now attempts to infer TM_GMTOFF and TM_ZONE if not
413 already defined, to make it easier to configure on common platforms.
414 Define NO_TM_GMTOFF and NO_TM_ZONE to suppress this.
416 Unless the new macro UNINIT_TRAP is defined to 1, the tz code now
417 assumes that reading uninitialized memory yields garbage values
418 but does not cause other problems such as traps.
420 If TM_GMTOFF is defined and UNINIT_TRAP is 0, mktime is now
421 more likely to guess right for ambiguous time stamps near
422 transitions where tm_isdst does not change.
424 If HAVE_STRFTIME_L is defined to 1, the tz library now defines
425 strftime_l for compatibility with recent versions of POSIX.
426 Only the C locale is supported, though. HAVE_STRFTIME_L defaults
427 to 1 on recent POSIX versions, and to 0 otherwise.
429 tzselect -c now uses a hybrid distance measure that works better
430 in Africa. (Thanks to Alan Barrett for noting the problem.)
432 The C source code now ports to NetBSD when GCC_DEBUG_FLAGS is used,
433 or when time_tz is defined.
435 When HAVE_UTMPX_H is set the 'date' command now builds on systems
436 whose <utmpx.h> file does not define WTMPX_FILE, and when setting
437 the date it updates the wtmpx file if _PATH_WTMPX is defined.
438 This affects GNU/Linux and similar systems.
440 For easier maintenance later, some C code has been simplified,
441 some lint has been removed, and the code has been tweaked so that
442 plain 'make' is more likely to work.
444 The C type 'bool' is now used for boolean values, instead of 'int'.
446 The long-obsolete LOCALE_HOME code has been removed.
448 The long-obsolete 'gtime' function has been removed.
450 Changes affecting build procedure
452 'zdump' no longer links in ialloc.o, as it's not needed.
454 'make check_time_t_alternatives' no longer assumes GNU diff.
456 Changes affecting distribution tarballs
458 The files checktab.awk and zoneinfo2tdf.pl are now distributed in
459 the tzdata tarball instead of the tzcode tarball, since they help
460 maintain the data. The NEWS and Theory files are now also
461 distributed in the tzdata tarball, as they're relevant for data.
462 (Thanks to Alan Barrett for pointing this out.) Also, the
463 leapseconds.awk file is no longer distributed in the tzcode
464 tarball, since it belongs in the tzdata tarball (where 2014f
465 inadvertently also distributed it).
467 Changes affecting documentation and commentary
469 A new file CONTRIBUTING is distributed. (Thanks to Tim Parenti for
470 suggesting a CONTRIBUTING file, and to Tony Finch and Walter Harms
473 The man pages have been updated to use function prototypes,
474 to document thread-safe variants like localtime_r, and to document
475 the NetBSD-inspired functions tzalloc, tzfree, localtime_rz, and
478 The fields in Link lines have been renamed to be more descriptive
479 and more like the parameters of 'ln'. LINK-FROM has become TARGET,
480 and LINK-TO has become LINK-NAME.
482 tz-link.htm mentions the IETF's tzdist working group; Windows
483 Runtime etc. (thanks to Matt Johnson); and HP-UX's tztab.
485 Some broken URLs have been fixed in the commentary. (Thanks to
488 Commentary about Philippines DST has been updated, and commentary
489 on pre-1970 time in India has been added.
492 Release 2014f - 2014-08-05 17:42:36 -0700
494 Changes affecting future time stamps
496 Russia will subtract an hour from most of its time zones on 2014-10-26
497 at 02:00 local time. (Thanks to Alexander Krivenyshev.)
498 There are a few exceptions: Magadan Oblast (Asia/Magadan) and Zabaykalsky
499 Krai are subtracting two hours; conversely, Chukotka Autonomous Okrug
500 (Asia/Anadyr), Kamchatka Krai (Asia/Kamchatka), Kemerovo Oblast
501 (Asia/Novokuznetsk), and the Samara Oblast and the Udmurt Republic
502 (Europe/Samara) are not changing their clocks. The changed zones are
503 Europe/Kaliningrad, Europe/Moscow, Europe/Simferopol, Europe/Volgograd,
504 Asia/Yekaterinburg, Asia/Omsk, Asia/Novosibirsk, Asia/Krasnoyarsk,
505 Asia/Irkutsk, Asia/Yakutsk, Asia/Vladivostok, Asia/Khandyga,
506 Asia/Sakhalin, and Asia/Ust-Nera; Asia/Magadan will have two hours
507 subtracted; and Asia/Novokuznetsk's time zone abbreviation is affected,
508 but not its UTC offset. Two zones are added: Asia/Chita (split
509 from Asia/Yakutsk, and also with two hours subtracted) and
510 Asia/Srednekolymsk (split from Asia/Magadan, but with only one hour
511 subtracted). (Thanks to Tim Parenti for much of the above.)
513 Changes affecting time zone abbreviations
515 Australian eastern time zone abbreviations are now AEST/AEDT not EST,
516 and similarly for the other Australian zones. That is, for eastern
517 standard and daylight saving time the abbreviations are AEST and AEDT
518 instead of the former EST for both; similarly, ACST/ACDT, ACWST/ACWDT,
519 and AWST/AWDT are now used instead of the former CST, CWST, and WST.
520 This change does not affect UTC offsets, only time zone abbreviations.
521 (Thanks to Rich Tibbett and many others.)
523 Asia/Novokuznetsk shifts from NOVT to KRAT (remaining on UTC+7)
524 effective 2014-10-26 at 02:00 local time.
526 The time zone abbreviation for Xinjiang Time (observed in Ürümqi)
527 has been changed from URUT to XJT. (Thanks to Luther Ma.)
529 Prefer MSK/MSD for Moscow time in Russia, even in other cities.
530 Similarly, prefer EET/EEST for eastern European time in Russia.
532 Change time zone abbreviations in (western) Samoa to use "ST" and
533 "DT" suffixes, as this is more likely to match common practice.
534 Prefix "W" to (western) Samoa time when its standard-time offset
535 disagrees with that of American Samoa.
537 America/Metlakatla now uses PST, not MeST, to abbreviate its time zone.
539 Time zone abbreviations have been updated for Japan's two time
540 zones used 1896-1937. JWST now stands for Western Standard
541 Time, and JCST for Central Standard Time (formerly this was CJT).
542 These abbreviations are now used for time in Korea, Taiwan,
543 and Sakhalin while controlled by Japan.
545 Changes affecting past time stamps
547 China's five zones have been simplified to two, since the post-1970
548 differences in the other three seem to have been imaginary. The
549 zones Asia/Harbin, Asia/Chongqing, and Asia/Kashgar have been
550 removed; backwards-compatibility links still work, albeit with
551 different behaviors for time stamps before May 1980. Asia/Urumqi's
552 1980 transition to UTC+8 has been removed, so that it is now at
553 UTC+6 and not UTC+8. (Thanks to Luther Ma and to Alois Treindl;
554 Treindl sent helpful translations of two papers by Guo Qingsheng.)
556 Some zones have been turned into links, when they differed from existing
557 zones only for older UTC offsets where data entries were likely invented.
558 These changes affect UTC offsets in pre-1970 time stamps only. This is
559 similar to the change in release 2013e, except this time for western
560 Africa. The affected zones are: Africa/Bamako, Africa/Banjul,
561 Africa/Conakry, Africa/Dakar, Africa/Freetown, Africa/Lome,
562 Africa/Nouakchott, Africa/Ouagadougou, Africa/Sao_Tome, and
563 Atlantic/St_Helena. This also affects the backwards-compatibility
564 link Africa/Timbuktu. (Thanks to Alan Barrett, Stephen Colebourne,
565 Tim Parenti, and David Patte for reporting problems in earlier
566 versions of this change.)
568 Asia/Shanghai's pre-standard-time UT offset has been changed from
569 8:05:57 to 8:05:43, the location of Xujiahui Observatory. Its
570 transition to standard time has been changed from 1928 to 1901.
572 Asia/Taipei switched to JWST on 1896-01-01, then to JST on 1937-10-01,
573 then to CST on 1945-09-21 at 01:00, and did not observe DST in 1945.
574 In 1946 it observed DST from 05-15 through 09-30; in 1947
575 from 04-15 through 10-31; and in 1979 from 07-01 through 09-30.
576 (Thanks to Yu-Cheng Chuang.)
578 Asia/Riyadh's transition to standard time is now 1947-03-14, not 1950.
580 Europe/Helsinki's 1942 fall-back transition was 10-04 at 01:00, not
581 10-03 at 00:00. (Thanks to Konstantin Hyppönen.)
583 Pacific/Pago_Pago has been changed from UTC-11:30 to UTC-11 for the period
586 Pacific/Chatham has been changed to New Zealand standard time plus
587 45 minutes for the period before 1957, reflecting a 1956 remark in
588 the New Zealand parliament.
590 Europe/Budapest has several pre-1946 corrections: in 1918 the transition
591 out of DST was on 09-16, not 09-29; in 1919 it was on 11-24, not 09-15; in
592 1945 it was on 11-01, not 11-03; in 1941 the transition to DST was 04-08
593 not 04-06 at 02:00; and there was no DST in 1920.
595 Africa/Accra is now assumed to have observed DST from 1920 through 1935.
597 Time in Russia before 1927 or so has been corrected by a few seconds in
598 the following zones: Europe/Moscow, Asia/Irkutsk, Asia/Tbilisi,
599 Asia/Tashkent, Asia/Vladivostok, Asia/Yekaterinburg, Europe/Helsinki, and
600 Europe/Riga. Also, Moscow's location has been changed to its Kilometer 0
601 point. (Thanks to Vladimir Karpinsky for the Moscow changes.)
603 Changes affecting data format
605 A new file 'zone1970.tab' supersedes 'zone.tab' in the installed data.
606 The new file's extended format allows multiple country codes per zone.
607 The older file is still installed but is deprecated; its format is
608 not changing and it will still be distributed for a while, but new
609 applications should use the new file.
611 The new file format simplifies maintenance of obscure locations.
612 To test this, it adds coverage for the Crozet Islands and the
613 Scattered Islands. (Thanks to Tobias Conradi and Antoine Leca.)
615 The file 'iso3166.tab' is planned to switch from ASCII to UTF-8.
616 It is still ASCII now, but commentary about the switch has been added.
617 The new file 'zone1970.tab' already uses UTF-8.
619 Changes affecting code
621 'localtime', 'mktime', etc. now use much less stack space if ALL_STATE
622 is defined. (Thanks to Elliott Hughes for reporting the problem.)
624 'zic' no longer mishandles input when ignoring case in locales that
625 are not compatible with English, e.g., unibyte Turkish locales when
626 compiled with HAVE_GETTEXT.
628 Error diagnostics of 'zic' and 'yearistype' have been reworded so that
629 they no longer use ASCII '-' as if it were a dash.
631 'zic' now rejects output file names that contain '.' or '..' components.
632 (Thanks to Tim Parenti for reporting the problem.)
634 'zic -v' now warns about output file names that do not follow
635 POSIX rules, or that contain a digit or '.'. (Thanks to Arthur
636 David Olson for starting the ball rolling on this.)
638 Some lint has been removed when using GCC_DEBUG_FLAGS with GCC 4.9.0.
640 Changes affecting build procedure
642 'zic' no longer links in localtime.o and asctime.o, as they're not needed.
643 (Thanks to John Cochran.)
645 Changes affecting documentation and commentary
647 The 'Theory' file documents legacy names, the longstanding
648 exceptions to the POSIX-inspired file name rules.
650 The 'zic' documentation clarifies the role of time types when
651 interpreting dates. (Thanks to Arthur David Olson.)
653 Documentation and commentary now prefer UTF-8 to US-ASCII,
654 allowing the use of proper accents in foreign words and names.
655 Code and data have not changed because of this. (Thanks to
656 Garrett Wollman, Ian Abbott, and Guy Harris for helping to debug
659 Non-HTML documentation and commentary now use plain-text URLs instead of
660 HTML insertions, and are more consistent about bracketing URLs when they
661 are not already surrounded by white space. (Thanks to suggestions by
664 There is new commentary about Xujiahui Observatory, the five time-zone
665 project in China from 1918 to 1949, timekeeping in Japanese-occupied
666 Shanghai, and Tibet Time in the 1950s. The sharp-eyed can spot the
667 warlord Jin Shuren in the data.
669 Commentary about the coverage of each Russian zone has been standardized.
670 (Thanks to Tim Parenti).
672 There is new commentary about contemporary timekeeping in Ethiopia.
674 Obsolete comments about a 2007 proposal for DST in Kuwait has been removed.
676 There is new commentary about time in Poland in 1919.
678 Proper credit has been given to DST inventor George Vernon Hudson.
680 Commentary about time in Metlakatla, AK and Resolute, NU has been
681 improved, with a new source for the former.
683 In zone.tab, Pacific/Easter no longer mentions Salas y Gómez, as it
686 Commentary about permanent Antarctic bases has been updated.
688 Several typos have been corrected. (Thanks to Tim Parenti for
689 contributing some of these fixes.)
691 tz-link.htm now mentions the JavaScript libraries Moment Timezone,
692 TimezoneJS.Date, Walltime-js, and Timezone. (Thanks to a heads-up
693 from Matt Johnson.) Also, it mentions the Go 'latlong' package.
694 (Thanks to a heads-up from Dirkjan Ochtman.)
696 The files usno1988, usno1989, usno1989a, usno1995, usno1997, and usno1998
697 have been removed. These obsolescent US Naval Observatory entries were no
698 longer helpful for maintenance. (Thanks to Tim Parenti for the suggestion.)
701 Release 2014e - 2014-06-12 21:53:52 -0700
703 Changes affecting near-future time stamps
705 Egypt's 2014 Ramadan-based transitions are June 26 and July 31 at 24:00.
706 (Thanks to Imed Chihi.) Guess that from 2015 on Egypt will temporarily
707 switch to standard time at 24:00 the last Thursday before Ramadan, and
708 back to DST at 00:00 the first Friday after Ramadan.
710 Similarly, Morocco's are June 28 at 03:00 and August 2 at 02:00. (Thanks
711 to Milamber Space Network.) Guess that from 2015 on Morocco will
712 temporarily switch to standard time at 03:00 the last Saturday before
713 Ramadan, and back to DST at 02:00 the first Saturday after Ramadan.
715 Changes affecting past time stamps
717 The abbreviation "MSM" (Moscow Midsummer Time) is now used instead of
718 "MSD" for Moscow's double daylight time in summer 1921. Also, a typo
719 "VLASST" has been repaired to be "VLAST" for Vladivostok summer time
720 in 1991. (Thanks to Hank W. for reporting the problems.)
722 Changes affecting commentary
724 tz-link.htm now cites RFC 7265 for jCal, mentions PTP and the
725 draft CalDAV extension, updates URLs for TSP, TZInfo, IATA, and
726 removes stale pointers to World Time Explorer and WORLDTIME.
729 Release 2014d - 2014-05-27 21:34:40 -0700
731 Changes affecting code
733 zic no longer generates files containing time stamps before the Big Bang.
734 This works around GNOME bug 730332
735 <https://bugzilla.gnome.org/show_bug.cgi?id=730332>.
736 (Thanks to Leonardo Chiquitto for reporting the bug, and to
737 Arthur David Olson and James Cloos for suggesting improvements to the fix.)
739 Changes affecting documentation
741 tz-link.htm now mentions GNOME.
744 Release 2014c - 2014-05-13 07:44:13 -0700
746 Changes affecting near-future time stamps
748 Egypt observes DST starting 2014-05-15 at 24:00.
749 (Thanks to Ahmad El-Dardiry and Gunther Vermier.)
750 Details have not been announced, except that DST will not be observed
751 during Ramadan. Guess that DST will stop during the same Ramadan dates as
752 Morocco, and that Egypt's future spring and fall transitions will be the
753 same as 2010 when it last observed DST, namely April's last Friday at
754 00:00 to September's last Thursday at 23:00 standard time. Also, guess
755 that Ramadan transitions will be at 00:00 standard time.
757 Changes affecting code
759 zic now generates transitions for minimum time values, eliminating guesswork
760 when handling low-valued time stamps. (Thanks to Arthur David Olson.)
762 Port to Cygwin sans glibc. (Thanks to Arthur David Olson.)
764 Changes affecting commentary and documentation
766 Remove now-confusing comment about Jordan. (Thanks to Oleksii Nochovnyi.)
769 Release 2014b - 2014-03-24 21:28:50 -0700
771 Changes affecting near-future time stamps
773 Crimea switches to Moscow time on 2014-03-30 at 02:00 local time.
774 (Thanks to Alexander Krivenyshev.) Move its zone.tab entry from UA to RU.
776 New entry for Troll station, Antarctica. (Thanks to Paul-Inge Flakstad and
777 Bengt-Inge Larsson.) This is currently an approximation; a better version
778 will require the zic and localtime fixes mentioned below, and the plan is
779 to wait for a while until at least the zic fixes propagate.
781 Changes affecting code
783 'zic' and 'localtime' no longer reject locations needing four transitions
784 per year for the foreseeable future. (Thanks to Andrew Main (Zefram).)
785 Also, 'zic' avoids some unlikely failures due to integer overflow.
787 Changes affecting build procedure
789 'make check' now detects Rule lines defined but never used.
790 The NZAQ rules, an instance of this problem, have been removed.
792 Changes affecting commentary and documentation
794 Fix Tuesday/Thursday typo in description of time in Israel.
795 (Thanks to Bert Katz via Pavel Kharitonov and Mike Frysinger.)
797 Microsoft Windows 8.1 doesn't support tz database names. (Thanks
798 to Donald MacQueen.) Instead, the Microsoft Windows Store app
799 library supports them.
801 Add comments about Johnston Island time in the 1960s.
802 (Thanks to Lyle McElhaney.)
804 Morocco's 2014 DST start will be as predicted.
805 (Thanks to Sebastien Willemijns.)
808 Release 2014a - 2014-03-07 23:30:29 -0800
810 Changes affecting near-future time stamps
812 Turkey begins DST on 2014-03-31, not 03-30. (Thanks to Faruk Pasin for
813 the heads-up, and to Tim Parenti for simplifying the update.)
815 Changes affecting past time stamps
817 Fiji ended DST on 2014-01-19 at 02:00, not the previously-scheduled 03:00.
818 (Thanks to Steffen Thorsen.)
820 Ukraine switched from Moscow to Eastern European time on 1990-07-01
821 (not 1992-01-01), and observed DST during the entire next winter.
822 (Thanks to Vladimir in Moscow via Alois Treindl.)
824 In 1988 Israel observed DST from 04-10 to 09-04, not 04-09 to 09-03.
825 (Thanks to Avigdor Finkelstein.)
827 Changes affecting code
829 A uninitialized-storage bug in 'localtime' has been fixed.
830 (Thanks to Logan Chien.)
832 Changes affecting the build procedure
834 The settings for 'make check_web' now default to Ubuntu 13.10.
836 Changes affecting commentary and documentation
838 The boundary of the US Pacific time zone is given more accurately.
839 (Thanks to Alan Mintz.)
841 Chile's 2014 DST will be as predicted. (Thanks to José Miguel Garrido.)
843 Paraguay's 2014 DST will be as predicted. (Thanks to Carlos Raúl Perasso.)
845 Better descriptions of countries with same time zone history as
846 Trinidad and Tobago since 1970. (Thanks to Alan Barrett for suggestion.)
848 Several changes affect tz-link.htm, the main web page.
850 Mention Time.is (thanks to Even Scharning) and WX-now (thanks to
853 Mention xCal (Internet RFC 6321) and jCal.
855 Microsoft has some support for tz database names.
857 CLDR data formats include both XML and JSON.
859 Mention Maggiolo's map of solar vs standard time.
860 (Thanks to Arthur David Olson.)
862 Mention TZ4Net. (Thanks to Matt Johnson.)
864 Mention the timezone-olson Haskell package.
866 Mention zeitverschiebung.net. (Thanks to Martin Jäger.)
868 Remove moribund links to daylight-savings-time.info and to
869 Simple Timer + Clocks.
871 Update two links. (Thanks to Oscar van Vlijmen.)
873 Fix some formatting glitches, e.g., remove random newlines from
874 abbr elements' title attributes.
877 Release 2013i - 2013-12-17 07:25:23 -0800
879 Changes affecting near-future time stamps:
881 Jordan switches back to standard time at 00:00 on December 20, 2013.
882 The 2006-2011 transition schedule is planned to resume in 2014.
883 (Thanks to Steffen Thorsen.)
885 Changes affecting past time stamps:
887 In 2004, Cuba began DST on March 28, not April 4.
888 (Thanks to Steffen Thorsen.)
890 Changes affecting code
892 The compile-time flag NOSOLAR has been removed, as nowadays the
893 benefit of slightly shrinking runtime table size is outweighed by the
894 cost of disallowing potential future updates that exceed old limits.
896 Changes affecting documentation and commentary
898 The files solar87, solar88, and solar89 are no longer distributed.
899 They were a negative experiment - that is, a demonstration that
900 tz data can represent solar time only with some difficulty and error.
901 Their presence in the distribution caused confusion, as Riyadh
902 civil time was generally not solar time in those years.
904 tz-link.htm now mentions Noda Time. (Thanks to Matt Johnson.)
907 Release 2013h - 2013-10-25 15:32:32 -0700
909 Changes affecting current and future time stamps:
911 Libya has switched its time zone back to UTC+2 without DST,
912 instead of UTC+1 with DST. (Thanks to Even Scharning.)
914 Western Sahara (Africa/El_Aaiun) uses Morocco's DST rules.
915 (Thanks to Gwillim Law.)
917 Changes affecting future time stamps:
919 Acre and (we guess) western Amazonas will switch from UTC-4 to UTC-5
920 on 2013-11-10. This affects America/Rio_Branco and America/Eirunepe.
921 (Thanks to Steffen Thorsen.)
923 Add entries for DST transitions in Morocco in the year 2038.
924 This avoids some year-2038 glitches introduced in 2013g.
925 (Thanks to Yoshito Umaoka for reporting the problem.)
927 Changes affecting API
929 The 'tzselect' command no longer requires the 'select' command,
930 and should now work with /bin/sh on more platforms. It also works
931 around a bug in BusyBox awk before version 1.21.0. (Thanks to
932 Patrick 'P. J.' McDermott and Alan Barrett.)
934 Changes affecting code
936 Fix localtime overflow bugs with 32-bit unsigned time_t.
938 zdump no longer assumes sscanf returns maximal values on overflow.
940 Changes affecting the build procedure
942 The builder can specify which programs to use, if any, instead of
943 'ar' and 'ranlib', and libtz.a is now built locally before being
944 installed. (Thanks to Michael Forney.)
946 A dependency typo in the 'zdump' rule has been fixed.
947 (Thanks to Andrew Paprocki.)
949 The Makefile has been simplified by assuming that 'mkdir -p' and 'cp -f'
950 work as specified by POSIX.2-1992 or later; this is portable nowadays.
952 'make clean' no longer removes 'leapseconds', since it's
953 host-independent and is part of the distribution.
955 The unused makefile macros TZCSRCS, TZDSRCS, DATESRCS have been removed.
957 Changes affecting documentation and commentary
959 tz-link.htm now mentions TC TIMEZONE's draft time zone service protocol
960 (thanks to Mike Douglass) and TimezoneJS.Date (thanks to Jim Fehrle).
962 Update URLs in tz-link page. Add URLs for Microsoft Windows, since
963 8.1 introduces tz support. Remove URLs for Tru64 and UnixWare (no
964 longer maintained) and for old advisories. SOFA now does C.
966 Release 2013g - 2013-09-30 21:08:26 -0700
968 Changes affecting current and near-future time stamps
970 Morocco now observes DST from the last Sunday in March to the last
971 Sunday in October, not April to September respectively. (Thanks
974 Changes affecting 'zic'
976 'zic' now runs on platforms that lack both hard links and symlinks.
977 (Thanks to Theo Veenker for reporting the problem, for MinGW.)
978 Also, fix some bugs on platforms that lack hard links but have symlinks.
980 'zic -v' again warns that Asia/Tehran has no POSIX environment variable
981 to predict the far future, fixing a bug introduced in 2013e.
983 Changes affecting the build procedure
985 The 'leapseconds' file is again put into the tzdata tarball.
986 Also, 'leapseconds.awk', so tzdata is self-contained. (Thanks to
987 Matt Burgess and Ian Abbott.) The timestamps of these and other
988 dependent files in tarballs are adjusted more consistently.
990 Changes affecting documentation and commentary
992 The README file is now part of the data tarball as well as the code.
993 It now states that files are public domain unless otherwise specified.
994 (Thanks to Andrew Main (Zefram) for asking for clarifications.)
995 Its details about the 1989 release moved to a place of honor near
999 Release 2013f - 2013-09-24 23:37:36 -0700
1001 Changes affecting near-future time stamps
1003 Tocantins will very likely not observe DST starting this spring.
1004 (Thanks to Steffen Thorsen.)
1006 Jordan will likely stay at UTC+3 indefinitely, and will not fall
1009 Palestine will fall back at 00:00, not 01:00. (Thanks to Steffen Thorsen.)
1011 Changes affecting API
1013 The types of the global variables 'timezone' and 'altzone' (if present)
1014 have been changed back to 'long'. This is required for 'timezone'
1015 by POSIX, and for 'altzone' by common practice, e.g., Solaris 11.
1016 These variables were originally 'long' in the tz code, but were
1017 mistakenly changed to 'time_t' in 1987; nobody reported the
1018 incompatibility until now. The difference matters on x32, where
1019 'long' is 32 bits and 'time_t' is 64. (Thanks to Elliott Hughes.)
1021 Changes affecting the build procedure
1023 Avoid long strings in leapseconds.awk to work around a mawk bug.
1024 (Thanks to Cyril Baurand.)
1026 Changes affecting documentation and commentary
1028 New file 'NEWS' that contains release notes like this one.
1030 Paraguay's law does not specify DST transition time; 00:00 is customary.
1031 (Thanks to Waldemar Villamayor-Venialbo.)
1033 Minor capitalization fixes.
1035 Changes affecting version-control only
1037 The experimental GitHub repository now contains annotated and
1038 signed tags for recent releases, e.g., '2013e' for Release 2013e.
1039 Releases are tagged starting with 2012e; earlier releases were
1040 done differently, and tags would either not have a simple name or
1041 not exactly match what was released.
1043 'make set-timestamps' is now simpler and a bit more portable.
1046 Release 2013e - 2013-09-19 23:50:04 -0700
1048 Changes affecting near-future time stamps
1050 This year Fiji will start DST on October 27, not October 20.
1051 (Thanks to David Wheeler for the heads-up.) For now, guess that
1052 Fiji will continue to spring forward the Sunday before the fourth
1055 Changes affecting current and future time zone abbreviations
1057 Use WIB/WITA/WIT rather than WIT/CIT/EIT for alphabetic Indonesian
1058 time zone abbreviations since 1932. (Thanks to George Ziegler,
1059 Priyadi Iman Nurcahyo, Zakaria, Jason Grimes, Martin Pitt, and
1060 Benny Lin.) This affects Asia/Dili, Asia/Jakarta, Asia/Jayapura,
1061 Asia/Makassar, and Asia/Pontianak.
1063 Use ART (UTC-3, standard time), rather than WARST (also UTC-3, but
1064 daylight saving time) for San Luis, Argentina since 2009.
1066 Changes affecting Godthåb time stamps after 2037 if version mismatch
1068 Allow POSIX-like TZ strings where the transition time's hour can
1069 range from -167 through 167, instead of the POSIX-required 0
1070 through 24. E.g., TZ='FJT-12FJST,M10.3.1/146,M1.3.4/75' for the
1071 new Fiji rules. This is a more-compact way to represent
1072 far-future time stamps for America/Godthab, America/Santiago,
1073 Antarctica/Palmer, Asia/Gaza, Asia/Hebron, Asia/Jerusalem,
1074 Pacific/Easter, and Pacific/Fiji. Other zones are unaffected by
1075 this change. (Derived from a suggestion by Arthur David Olson.)
1077 Allow POSIX-like TZ strings where daylight saving time is in
1078 effect all year. E.g., TZ='WART4WARST,J1/0,J365/25' for Western
1079 Argentina Summer Time all year. This supports a more-compact way
1080 to represent the 2013d data for America/Argentina/San_Luis.
1081 Because of the change for San Luis noted above this change does not
1082 affect the current data. (Thanks to Andrew Main (Zefram) for
1083 suggestions that improved this change.)
1085 Where these two TZ changes take effect, there is a minor extension
1086 to the tz file format in that it allows new values for the
1087 embedded TZ-format string, and the tz file format version number
1088 has therefore been increased from 2 to 3 as a precaution.
1089 Version-2-based client code should continue to work as before for
1090 all time stamps before 2038. Existing version-2-based client code
1091 (tzcode, GNU/Linux, Solaris) has been tested on version-3-format
1092 files, and typically works in practice even for time stamps after
1093 2037; the only known exception is America/Godthab.
1095 Changes affecting time stamps before 1970
1097 Pacific/Johnston is now a link to Pacific/Honolulu. This corrects
1098 some errors before 1947.
1100 Some zones have been turned into links, when they differ from existing
1101 zones only in older data entries that were likely invented or that
1102 differ only in LMT or transitions from LMT. These changes affect
1103 only time stamps before 1943. The affected zones are:
1104 Africa/Juba, America/Anguilla, America/Aruba, America/Dominica,
1105 America/Grenada, America/Guadeloupe, America/Marigot,
1106 America/Montserrat, America/St_Barthelemy, America/St_Kitts,
1107 America/St_Lucia, America/St_Thomas, America/St_Vincent,
1108 America/Tortola, and Europe/Vaduz. (Thanks to Alois Treindl for
1109 confirming that the old Europe/Vaduz zone was wrong and the new
1110 link is better for WWII-era times.)
1112 Change Kingston Mean Time from -5:07:12 to -5:07:11. This affects
1113 America/Cayman, America/Jamaica and America/Grand_Turk time stamps
1116 Change the UT offset of Bern Mean Time from 0:29:44 to 0:29:46.
1117 This affects Europe/Zurich time stamps from 1853 to 1894. (Thanks
1120 Change the date of the circa-1850 Zurich transition from 1849-09-12
1121 to 1853-07-16, overriding Shanks with data from Messerli about
1122 postal and telegraph time in Switzerland.
1124 Changes affecting time zone abbreviations before 1970
1126 For Asia/Jakarta, use BMT (not JMT) for mean time from 1923 to 1932,
1127 as Jakarta was called Batavia back then.
1129 Changes affecting API
1131 The 'zic' command now outputs a dummy transition when far-future
1132 data can't be summarized using a TZ string, and uses a 402-year
1133 window rather than a 400-year window. For the current data, this
1134 affects only the Asia/Tehran file. It does not affect any of the
1135 time stamps that this file represents, so zdump outputs the same
1136 information as before. (Thanks to Andrew Main (Zefram).)
1138 The 'date' command has a new '-r' option, which lets you specify
1139 the integer time to display, a la FreeBSD.
1141 The 'tzselect' command has two new options '-c' and '-n', which lets you
1142 select a zone based on latitude and longitude.
1144 The 'zic' command's '-v' option now warns about constructs that
1145 require the new version-3 binary file format. (Thanks to Arthur
1146 David Olson for the suggestion.)
1148 Support for floating-point time_t has been removed.
1149 It was always dicey, and POSIX no longer requires it.
1150 (Thanks to Eric Blake for suggesting to the POSIX committee to
1151 remove it, and thanks to Alan Barrett, Clive D.W. Feather, Andy
1152 Heninger, Arthur David Olson, and Alois Treindl, for reporting
1153 bugs and elucidating some of the corners of the old floating-point
1156 The signatures of 'offtime', 'timeoff', and 'gtime' have been
1157 changed back to the old practice of using 'long' to represent UT
1158 offsets. This had been inadvertently and mistakenly changed to
1159 'int_fast32_t'. (Thanks to Christos Zoulas.)
1161 The code avoids undefined behavior on integer overflow in some
1162 more places, including gmtime, localtime, mktime and zdump.
1164 Changes affecting the zdump utility
1166 zdump now outputs "UT" when referring to Universal Time, not "UTC".
1167 "UTC" does not make sense for time stamps that predate the introduction
1168 of UTC, whereas "UT", a more-generic term, does. (Thanks to Steve Allen
1169 for clarifying UT vs UTC.)
1171 Data changes affecting behavior of tzselect and similar programs
1173 Country code BQ is now called the more-common name "Caribbean Netherlands"
1174 rather than the more-official "Bonaire, St Eustatius & Saba".
1176 Remove from zone.tab the names America/Montreal, America/Shiprock,
1177 and Antarctica/South_Pole, as they are equivalent to existing
1178 same-country-code zones for post-1970 time stamps. The data entries for
1179 these names are unchanged, so the names continue to work as before.
1181 Changes affecting code internals
1183 zic -c now runs way faster on 64-bit hosts when given large numbers.
1185 zic now uses vfprintf to avoid allocating and freeing some memory.
1187 tzselect now computes the list of continents from the data,
1188 rather than have it hard-coded.
1190 Minor changes pacify GCC 4.7.3 and GCC 4.8.1.
1192 Changes affecting the build procedure
1194 The 'leapseconds' file is now generated automatically from a
1195 new file 'leap-seconds.list', which is a copy of
1196 <ftp://time.nist.gov/pub/leap-seconds.list>.
1197 A new source file 'leapseconds.awk' implements this.
1198 The goal is simplification of the future maintenance of 'leapseconds'.
1200 When building the 'posix' or 'right' subdirectories, if the
1201 subdirectory would be a copy of the default subdirectory, it is
1202 now made a symbolic link if that is supported. This saves about
1203 2 MB of file system space.
1205 The links America/Shiprock and Antarctica/South_Pole have been
1206 moved to the 'backward' file. This affects only nondefault builds
1207 that omit 'backward'.
1209 Changes affecting version-control only
1211 .gitignore now ignores 'date'.
1213 Changes affecting documentation and commentary
1215 Changes to the 'tzfile' man page
1217 It now mentions that the binary file format may be extended in
1218 future versions by appending data.
1220 It now refers to the 'zdump' and 'zic' man pages.
1222 Changes to the 'zic' man page
1224 It lists conditions that elicit a warning with '-v'.
1226 It says that the behavior is unspecified when duplicate names
1227 are given, or if the source of one link is the target of another.
1229 Its examples are updated to match the latest data.
1231 The definition of white space has been clarified slightly.
1232 (Thanks to Michael Deckers.)
1234 Changes to the 'Theory' file
1236 There is a new section about the accuracy of the tz database,
1237 describing the many ways that errors can creep in, and
1238 explaining why so many of the pre-1970 time stamps are wrong or
1239 misleading (thanks to Steve Allen, Lester Caine, and Garrett
1240 Wollman for discussions that contributed to this).
1242 The 'Theory' file describes LMT better (this follows a
1243 suggestion by Guy Harris).
1245 It refers to the 2013 edition of POSIX rather than the 2004 edition.
1247 It's mentioned that excluding 'backward' should not affect the
1248 other data, and it suggests at least one zone.tab name per
1249 inhabited country (thanks to Stephen Colebourne).
1251 Some longstanding restrictions on names are documented, e.g.,
1252 'America/New_York' precludes 'America/New_York/Bronx'.
1254 It gives more reasons for the 1970 cutoff.
1256 It now mentions which time_t variants are supported, such as
1257 signed integer time_t. (Thanks to Paul Goyette for reporting
1258 typos in an experimental version of this change.)
1260 (Thanks to Philip Newton for correcting typos in these changes.)
1262 Documentation and commentary is more careful to distinguish UT in
1263 general from UTC in particular. (Thanks to Steve Allen.)
1265 Add a better source for the Zurich 1894 transition.
1266 (Thanks to Pierre-Yves Berger.)
1268 Update shapefile citations in tz-link.htm. (Thanks to Guy Harris.)
1271 Release 2013d - 2013-07-05 07:38:01 -0700
1273 Changes affecting future time stamps:
1275 Morocco's midsummer transitions this year are July 7 and August 10,
1276 not July 9 and August 8. (Thanks to Andrew Paprocki.)
1278 Israel now falls back on the last Sunday of October.
1279 (Thanks to Ephraim Silverberg.)
1281 Changes affecting past time stamps:
1283 Specify Jerusalem's location more precisely; this changes the pre-1880
1286 Changing affecting metadata only:
1288 Fix typos in the entries for country codes BQ and SX.
1290 Changes affecting code:
1292 Rework the code to fix a bug with handling Australia/Macquarie on
1293 32-bit hosts (thanks to Arthur David Olson).
1295 Port to platforms like NetBSD, where time_t can be wider than long.
1297 Add support for testing time_t types other than the system's.
1298 Run 'make check_time_t_alternatives' to try this out.
1299 Currently, the tests fail for unsigned time_t;
1300 this should get fixed at some point.
1302 Changes affecting documentation and commentary:
1304 Deemphasize the significance of national borders.
1306 Update the zdump man page.
1308 Remove obsolete NOID comment (thanks to Denis Excoffier).
1310 Update several URLs and comments in the web pages.
1312 Spelling fixes (thanks to Kevin Lyda and Jonathan Leffler).
1314 Update URL for CLDR Zone->Tzid table (thanks to Yoshito Umaoka).
1317 Release 2013c - 2013-04-19 16:17:40 -0700
1319 Changes affecting current and future time stamps:
1321 Palestine observed DST starting March 29, 2013. (Thanks to
1322 Steffen Thorsen.) From 2013 on, Gaza and Hebron both observe DST,
1323 with the predicted rules being the last Thursday in March at 24:00
1324 to the first Friday on or after September 21 at 01:00.
1326 Assume that the recent change to Paraguay's DST rules is permanent,
1327 by moving the end of DST to the 4th Sunday in March every year.
1328 (Thanks to Carlos Raúl Perasso.)
1330 Changes affecting past time stamps:
1332 Fix some historical data for Palestine to agree with that of
1333 timeanddate.com, as follows:
1335 The spring 2008 change in Gaza and Hebron was on 00:00 Mar 28, not
1338 The fall 2009 change in Gaza and Hebron on Sep 4 was at 01:00, not
1341 The spring 2010 change in Hebron was 00:00 Mar 26, not 00:01 Mar 27.
1343 The spring 2011 change in Gaza was 00:01 Apr 1, not 12:01 Apr 2.
1345 The spring 2011 change in Hebron on Apr 1 was at 00:01, not 12:01.
1347 The fall 2011 change in Hebron on Sep 30 was at 00:00, not 03:00.
1349 Fix times of habitation for Macquarie to agree with the Tasmania
1350 Parks & Wildlife Service history, which indicates that permanent
1351 habitation was 1899-1919 and 1948 on.
1353 Changing affecting metadata only:
1355 Macquarie Island is politically part of Australia, not Antarctica.
1356 (Thanks to Tobias Conradi.)
1358 Sort Macquarie more-consistently with other parts of Australia.
1359 (Thanks to Tim Parenti.)
1362 Release 2013b - 2013-03-10 22:33:40 -0700
1364 Changes affecting current and future time stamps:
1366 Haiti uses US daylight-saving rules this year, and presumably future years.
1367 This changes time stamps starting today. (Thanks to Steffen Thorsen.)
1369 Paraguay will end DST on March 24 this year.
1370 (Thanks to Steffen Thorsen.) For now, assume it's just this year.
1372 Morocco does not observe DST during Ramadan;
1373 try to predict Ramadan in Morocco as best we can.
1374 (Thanks to Erik Homoet for the heads-up.)
1376 Changes affecting commentary:
1378 Update URLs in tz-link page. Add URLs for webOS, BB10, iOS.
1379 Update URL for Solaris. Mention Internet RFC 6557.
1380 Update Internet RFCs 2445->5545, 2822->5322.
1381 Switch from FTP to HTTP for Internet RFCs.
1384 Release 2013a - 2013-02-27 09:20:35 -0800
1386 Change affecting binary data format:
1388 The zone offset at the end of version-2-format zone files is now
1389 allowed to be 24:00, as per POSIX.1-2008. (Thanks to Arthur David Olson.)
1391 Changes affecting current and future time stamps:
1393 Chile's 2013 rules, and we guess rules for 2014 and later, will be
1394 the same as 2012, namely Apr Sun>=23 03:00 UTC to Sep Sun>=2 04:00 UTC.
1395 (Thanks to Steffen Thorsen and Robert Elz.)
1397 New Zones Asia/Khandyga, Asia/Ust-Nera, Europe/Busingen.
1398 (Thanks to Tobias Conradi and Arthur David Olson.)
1400 Many changes affect historical time stamps before 1940.
1401 These were deduced from: Milne J. Civil time. Geogr J. 1899
1402 Feb;13(2):173-94 <http://www.jstor.org/stable/1774359>.
1404 Changes affecting the code:
1406 Fix zic bug that mishandled Egypt's 2010 changes (this also affected
1407 the data). (Thanks to Arthur David Olson.)
1409 Fix localtime bug when time_t is unsigned and data files were generated
1410 by a signed time_t system. (Thanks to Doug Bailey for reporting and
1411 to Arthur David Olson for fixing.)
1413 Allow the email address for bug reports to be set by the packager.
1414 The default is tz@iana.org, as before. (Thanks to Joseph S. Myers.)
1416 Update HTML checking to be compatible with Ubuntu 12.10.
1418 Check that files are a safe subset of ASCII. At some point we may
1419 relax this requirement to a safe subset of UTF-8. Without the
1420 check, some non-UTF-8 encodings were leaking into the distribution.
1424 Restore a comment about copyright notices that was inadvertently deleted.
1425 (Thanks to Arthur David Olson.)
1427 Improve the commentary about which districts observe what times
1428 in Russia. (Thanks to Oscar van Vlijmen and Arthur David Olson).
1430 Add web page links to tz.js.
1432 Add "Run by the Monkeys" to tz-art. (Thanks to Arthur David Olson.)
1435 Release 2012j - 2012-11-12 18:34:49 -0800
1437 Libya moved to CET this weekend, but with DST planned next year.
1438 (Thanks to Even Scharning, Steffen Thorsen, and Tim Parenti.)
1440 Signatures now have the extension .asc, not .sign, as that's more
1441 standard. (Thanks to Phil Pennock.)
1443 The output of 'zdump --version', and of 'zic --version', now
1444 uses a format that is more typical for --version.
1445 (Thanks to Joseph S. Myers.)
1447 The output of 'tzselect --help', 'zdump --help', and 'zic --help'
1448 now uses tz@iana.org rather than the old elsie address.
1450 zic -v now complains about abbreviations that are less than 3
1451 or more than 6 characters, as per Posix. Formerly, it checked
1452 for abbreviations that were more than 3.
1454 'make public' no longer puts its temporary directory under /tmp,
1455 and uses the just-built zic rather than the system zic.
1457 Various fixes to documentation and commentary.
1460 Release 2012i - 2012-11-03 12:57:09 -0700
1462 Cuba switches from DST tomorrow at 01:00. (Thanks to Steffen Thorsen.)
1464 Linker flags can now be specified via LDFLAGS.
1465 AWK now defaults to 'awk', not 'nawk'.
1466 The shell in tzselect now defaults to /bin/bash, but this can
1467 be overridden by specifying KSHELL.
1468 The main web page now mentions the unofficial GitHub repository.
1469 (Thanks to Mike Frysinger.)
1471 Tarball signatures can now be built by running 'make signatures'.
1472 There are also new makefile rules 'tarballs', 'check_public', and
1473 separate makefile rules for each tarball and signature file.
1474 A few makefile rules are now more portable to strict POSIX.
1476 The main web page now lists the canonical IANA URL.
1479 Release 2012h - 2012-10-26 22:49:10 -0700
1481 Bahia no longer has DST. (Thanks to Kelley Cook.)
1483 Tocantins has DST. (Thanks to Rodrigo Severo.)
1485 Israel has new DST rules next year. (Thanks to Ephraim Silverberg.)
1487 Jordan stays on DST this winter. (Thanks to Steffen Thorsen.)
1491 More C modernization, except that at Arthur David Olson's suggestion
1492 the instances of 'register' were kept.
1495 Release 2012g - 2012-10-17 20:59:45 -0700
1497 Samoa fall 2012 and later. (Thanks to Nicholas Pereira and Robert Elz.)
1499 Palestine fall 2012. (Thanks to Steffen Thorsen.)
1503 To attack the version-number problem, this release ships the file
1504 'Makefile' (which contains the release number) in both the tzcode and
1505 the tzdata tarballs. The two Makefiles are identical, and should be
1506 identical in any matching pair of tarballs, so it shouldn't matter
1507 which order you extract the tarballs. Perhaps we can come up with a
1508 better version-number scheme at some point; this scheme does have the
1509 virtue of not adding more files.
1512 Release 2012f - 2012-09-12 23:17:03 -0700
1514 * australasia (Pacific/Fiji): Fiji DST is October 21 through January
1515 20 this year. (Thanks to Steffen Thorsen.)
1518 Release 2012e - 2012-08-02 20:44:55 -0700
1520 * australasia (Pacific/Fakaofo): Tokelau is UTC+13, not UTC+14.
1521 (Thanks to Steffen Thorsen.)
1523 * Use a single version number for both code and data.
1525 * .gitignore: New file.
1527 * Remove trailing white space.
1530 Release code2012c-data2012d - 2012-07-19 16:35:33 -0700
1532 Changes for Morocco's time stamps, which take effect in a couple of
1533 hours, along with infrastructure changes to accommodate how the tz
1534 code and data are released on IANA.
1537 Release data2012c - 2012-03-27 12:17:25 -0400
1540 Summer time changes for Morocco (to start late April 2012)
1543 Changes for 2012 for Gaza & the West Bank (Hebron) and Syria
1546 Haiti following US/Canada rules for 2012 (and we're assuming,
1547 for now anyway, for the future).
1550 Release 2012b - 2012-03-02 12:29:15 +0700
1552 There is just one change to tzcode2012b (compared with 2012a):
1553 the Makefile that was accidentally included with 2012a has been
1554 replaced with the version that should have been there, which is
1555 identical with the previous version (from tzcode2011i).
1557 There are just two changes in tzdata2012b compared with 2012a.
1559 Most significantly, summer time in Cuba has been delayed 3 weeks
1560 (now starts April 1 rather than March 11). Since Mar 11 (the old start
1561 date, as listed in 2012a) is just a little over a week away, this
1564 Less importantly, an excess tab in one of the changes in zone.tab
1565 in 2012a has been removed.
1568 Release 2012a - 2012-03-01 18:28:10 +0700
1570 The changes in tzcode2012a (compared to the previous version, 2011i)
1571 are entirely to the README and tz-art.htm and tz-link.htm files, if
1572 none of those concern you, you can ignore the code update. The changes
1573 reflect the changed addresses for the mailing list and the code and
1574 data distribution points & methods (and a link to DateTime::TimeZone::Tzfile
1575 has been added to tz-link.htm).
1577 In tzdata2012a (compared to the previous release, which was 2011n)
1578 the major changes are:
1579 Chile 2011/2012 and 2012/2013 summer time date adjustments.
1580 Falkland Islands onto permanent summer time (we're assuming for the
1581 foreseeable future, though 2012 is all we're fairly certain of.)
1582 Armenia has abolished Summer Time.
1583 Tokelau jumped the International Date Line back last December
1584 (just the same as their near neighbour, Samoa).
1585 America/Creston is a new zone for a small area of British Columbia
1586 There will be a leapsecond 2012-06-30 23:59:60 UTC.
1588 Other minor changes are:
1589 Corrections to 1918 Canadian summer time end dates.
1590 Updated URL for UK time zone history (in comments)
1591 A few typos in Le Corre's list of free French place names (comments)
1594 Release data2011n - 2011-10-30 14:57:54 +0700
1596 There are three changes of note - most urgently, Cuba (America/Havana)
1597 has extended summer time by two weeks, now to end on Nov 13, rather than
1598 the (already past) Oct 30. Second, the Pridnestrovian Moldavian Republic
1599 (Europe/Tiraspol) decided not to split from the rest of Moldova after
1600 all, and consequently that zone has been removed (again) and reinstated
1601 in the "backward" file as a link to Europe/Chisinau. And third, the
1602 end date for Fiji's summer time this summer was moved forward from the
1603 earlier planned Feb 26, to Jan 22.
1605 Apart from that, Moldova (MD) returns to a single entry in zone.tab
1606 (and the incorrect syntax that was in the 2011m version of that file
1607 is so fixed - it would have been fixed in a different way had this
1608 change not happened - that's the "missing" sccs version id).
1611 Release data2011m - 2011-10-24 21:42:16 +0700
1613 In particular, the typos in comments in the data (2011-11-17 should have
1614 been 2011-10-17 as Alan Barrett noted, and spelling of Tiraspol that
1615 Tim Parenti noted) have been fixed, and the change for Ukraine has been
1616 made in all 4 Ukrainian zones, rather than just Kiev (again, thanks to
1617 Tim Parenti, and also Denys Gavrysh)
1619 In addition, I added Europe/Tiraspol to zone.tab.
1621 This time, all the files have new version numbers... (including the files
1622 otherwise unchanged in 2011m that were changed in 2011l but didn't get new
1623 version numbers there...)
1626 Release data2011l - 2011-10-10 11:15:43 +0700
1628 There are just 2 changes that cause different generated tzdata files from
1629 zic, to Asia/Hebron and Pacific/Fiji - the possible change for Bahia, Brazil
1630 is included, but commented out. Compared with the diff I sent out last week,
1631 this version also includes attributions for the sources for the changes
1632 (in much the same format as ado used, but the html tags have not been
1633 checked, verified, or used in any way at all, so if there are errors there,
1634 please let me know.)
1637 Release data2011k - 2011-09-20 17:54:03 -0400
1642 Release data2011j - 2011-09-12 09:22:49 -0400
1644 (contemporary changes for Samoa; past changes for Kenya, Uganda, and
1645 Tanzania); there are also two spelling corrections to comments in
1646 the australasia file (with thanks to Christos Zoulas).
1649 Release 2011i - 2011-08-29 05:56:32 -0400
1654 Release data2011h - 2011-06-15 18:41:48 -0400
1656 Russia and Curaçao changes
1659 Release 2011g - 2011-04-25 09:07:22 -0400
1661 update the rules for Egypt to reflect its abandonment of DST this year
1664 Release 2011f - 2011-04-06 17:14:53 -0400
1669 Release 2011e - 2011-03-31 16:04:38 -0400
1671 Morocco, Chile, and tz-link changes
1674 Release 2011d - 2011-03-14 09:18:01 -0400
1676 changes that impact present-day time stamps in Cuba, Samoa, and Turkey
1679 Release 2011c - 2011-03-07 09:30:09 -0500
1681 These do affect current time stamps in Chile and Annette Island, Canada.
1684 Release 2011b - 2011-02-07 08:44:50 -0500
1689 Release 2011a - 2011-01-24 10:30:16 -0500
1694 Release data2010o - 2010-11-01 09:18:23 -0400
1696 change to the end of DST in Fiji in 2011
1699 Release 2010n - 2010-10-25 08:19:17 -0400
1704 Release 2010m - 2010-09-27 09:24:48 -0400
1706 Hong Kong, Vostok, and zic.c changes
1709 Release 2010l - 2010-08-16 06:57:25 -0400
1714 Release 2010k - 2010-07-26 10:42:27 -0400
1719 Release 2010j - 2010-05-10 09:07:48 -0400
1721 changes for Bahía de Banderas and for version naming
1724 Release data2010i - 2010-04-16 18:50:45 -0400
1726 the end of DST in Morocco on 2010-08-08
1729 Release data2010h - 2010-04-05 09:58:56 -0400
1734 Release data2010g - 2010-03-24 11:14:53 -0400
1739 Release 2010f - 2010-03-22 09:45:46 -0400
1744 Release data2010e - 2010-03-08 14:24:27 -0500
1746 corrects the Dhaka bug found by Danvin Ruangchan
1749 Release data2010d - 2010-03-06 07:26:01 -0500
1754 Release 2010c - 2010-03-01 09:20:58 -0500
1756 changes including KRE's suggestion for earlier initialization of
1757 "goahead" and "goback" structure elements
1760 Release code2010a - 2010-02-16 10:40:04 -0500
1765 Release data2010b - 2010-01-20 12:37:01 -0500
1770 Release data2010a - 2010-01-18 08:30:04 -0500
1775 Release data2009u - 2009-12-26 08:32:28 -0500
1777 changes to DST in Bangladesh
1780 Release 2009t - 2009-12-21 13:24:27 -0500
1785 Release data2009s - 2009-11-14 10:26:32 -0500
1787 (cosmetic) Antarctica change and the DST-in-Fiji-in-2009-and-2010 change
1790 Release 2009r - 2009-11-09 10:10:31 -0500
1792 "antarctica" and "tz-link.htm" changes
1795 Release 2009q - 2009-11-02 09:12:40 -0500
1797 with two corrections as reported by Eric Muller and Philip Newton
1800 Release data2009p - 2009-10-23 15:05:27 -0400
1802 Argentina (including San Luis) changes (with the correction from
1806 Release data2009o - 2009-10-14 16:49:38 -0400
1808 Samoa (commentary only), Pakistan, and Bangladesh changes
1811 Release data2009n - 2009-09-22 15:13:38 -0400
1813 added commentary for Argentina and a change to the end of DST in
1817 Release data2009m - 2009-09-03 10:23:43 -0400
1819 Samoa and Palestine changes
1822 Release data2009l - 2009-08-14 09:13:07 -0400
1824 Samoa (comments only) and Egypt
1827 Release 2009k - 2009-07-20 09:46:08 -0400
1832 Release data2009j - 2009-06-15 06:43:59 -0400
1834 Bangladesh change (with a short turnaround since the DST change is
1838 Release 2009i - 2009-06-08 09:21:22 -0400
1840 updating for DST in Bangladesh this year
1843 Release 2009h - 2009-05-26 09:19:14 -0400
1848 Release data2009g - 2009-04-20 16:34:07 -0400
1853 Release data2009f - 2009-04-10 11:00:52 -0400
1855 correct DST in Pakistan
1858 Release 2009e - 2009-04-06 09:08:11 -0400
1863 Release 2009d - 2009-03-23 09:38:12 -0400
1865 Morocco, Tunisia, Argentina, and American Astronomical Society changes
1868 Release data2009c - 2009-03-16 09:47:51 -0400
1870 change to the start of Cuban DST
1873 Release 2009b - 2009-02-09 11:15:22 -0500
1878 Release 2009a - 2009-01-21 10:09:39 -0500
1883 Release data2008i - 2008-10-21 12:10:25 -0400
1885 southamerica and zone.tab files, with Argentina DST rule changes and
1886 United States zone reordering and recommenting
1889 Release 2008h - 2008-10-13 07:33:56 -0400
1894 Release 2008g - 2008-10-06 09:03:18 -0400
1896 Fix a broken HTML anchor and update Brazil's DST transitions;
1897 there's also a slight reordering of information in tz-art.htm.
1900 Release data2008f - 2008-09-09 22:33:26 -0400
1905 Release 2008e - 2008-07-28 14:11:17 -0400
1907 changes by Arthur David Olson and Jesper Nørgaard Welen
1910 Release data2008d - 2008-07-07 09:51:38 -0400
1912 changes by Arthur David Olson, Paul Eggert, and Rodrigo Severo
1915 Release data2008c - 2008-05-19 17:48:03 -0400
1917 Pakistan, Morocco, and Mongolia
1920 Release data2008b - 2008-03-24 08:30:59 -0400
1922 including renaming Asia/Calcutta to Asia/Kolkata, with a backward
1926 Release 2008a - 2008-03-08 05:42:16 -0500
1931 Release 2007k - 2007-12-31 10:25:22 -0500
1933 most importantly, changes to the "southamerica" file based on
1934 Argentina's readoption of daylight saving time
1937 Release 2007j - 2007-12-03 09:51:01 -0500
1939 1. eliminate the "P" (parameter) macro;
1941 2. the "noncontroversial" changes circulated on the time zone
1942 mailing list (less the changes to "logwtmp.c");
1944 3. eliminate "too many transition" errors when "min" is used in time
1947 4. changes by Paul Eggert (including updated information for Venezuela).
1950 Release data2007i - 2007-10-30 10:28:11 -0400
1952 changes for Cuba and Syria
1955 Release 2007h - 2007-10-01 10:05:51 -0400
1957 changes by Paul Eggert, as well as an updated link to the ICU
1958 project in tz-link.htm
1961 Release 2007g - 2007-08-20 10:47:59 -0400
1963 changes by Paul Eggert
1965 The "leapseconds" file has been updated to incorporate the most
1966 recent International Earth Rotation and Reference Systems Service
1969 There's an addition to tz-art.htm regarding the television show "Medium".
1972 Release 2007f - 2007-05-07 10:46:46 -0400
1974 changes by Paul Eggert (including Haiti, Turks and Caicos, and New
1977 changes to zic.c to allow hour values greater than 24 (along with
1978 Paul's improved time value overflow checking)
1981 Release 2007e - 2007-04-02 10:11:52 -0400
1983 Syria and Honduras changes by Paul Eggert
1985 zic.c variable renaming changes by Arthur David Olson
1988 Release 2007d - 2007-03-20 08:48:30 -0400
1990 changes by Paul Eggert
1992 the elimination of white space at the ends of lines
1995 Release 2007c - 2007-02-26 09:09:37 -0500
1997 changes by Paul Eggert
2000 Release 2007b - 2007-02-12 09:34:20 -0500
2002 Paul Eggert's proposed change to the quotation handling logic in zic.c.
2004 changes to the commentary in "leapseconds" reflecting the IERS
2005 announcement that there is to be no positive leap second at the end
2009 Release 2007a - 2007-01-08 12:28:29 -0500
2011 changes by Paul Eggert
2013 Derick Rethan's Asmara change
2015 Oscar van Vlijmen's Easter Island local mean time change
2017 symbolic link changes
2020 Release 2006p - 2006-11-27 08:54:27 -0500
2022 changes by Paul Eggert
2025 Release 2006o - 2006-11-06 09:18:07 -0500
2027 changes by Paul Eggert
2030 Release 2006n - 2006-10-10 11:32:06 -0400
2032 changes by Paul Eggert
2035 Release 2006m - 2006-10-02 15:32:35 -0400
2037 changes for Uruguay, Palestine, and Egypt by Paul Eggert
2039 (minimalist) changes to zic.8 to clarify "until" information
2042 Release data2006l - 2006-09-18 12:58:11 -0400
2044 Paul's best-effort work on this coming weekend's Egypt time change
2047 Release 2006k - 2006-08-28 12:19:09 -0400
2049 changes by Paul Eggert
2052 Release 2006j - 2006-08-21 09:56:32 -0400
2054 changes by Paul Eggert
2057 Release code2006i - 2006-08-07 12:30:55 -0400
2061 Ken Pizzini's conversion script
2064 Release code2006h - 2006-07-24 09:19:37 -0400
2066 adds public domain notices to four files
2068 includes a fix for transition times being off by a second
2070 adds a new recording to the "arts" file (information courtesy Colin Bowern)
2073 Release 2006g - 2006-05-08 17:18:09 -0400
2075 northamerica changes by Paul Eggert
2078 Release 2006f - 2006-05-01 11:46:00 -0400
2080 a missing version number problem is fixed (with thanks to Bradley
2081 White for catching the problem)
2084 Release 2006d - 2006-04-17 14:33:43 -0400
2086 changes by Paul Eggert
2088 added new items to tz-arts.htm that were found by Paul
2091 Release 2006c - 2006-04-03 10:09:32 -0400
2093 two sets of data changes by Paul Eggert
2095 a fencepost error fix in zic.c
2097 changes to zic.c and the "europe" file to minimize differences
2098 between output produced by the old 32-bit zic and the new 64-bit
2102 Release 2006b - 2006-02-20 10:08:18 -0500
2103 [tz32code2006b + tz64code2006b + tzdata2006b]
2107 All SCCS IDs were bumped to "8.1" for this release.
2110 Release 2006a - 2006-01-30 08:59:31 -0500
2112 changes by Paul Eggert (in particular, Indiana time zone moves)
2114 an addition to the zic manual page to describe how special-case
2115 transitions are handled
2118 Release 2005r - 2005-12-27 09:27:13 -0500
2120 Canadian changes by Paul Eggert
2122 They also add "<pre>" directives to time zone data files and reflect
2123 changes to warning message logic in "zdump.c" (but with calls to
2124 "gettext" kept unbundled at the suggestion of Ken Pizzini).
2127 Release 2005q - 2005-12-13 09:17:09 -0500
2129 Nothing earth-shaking here:
2130 1. Electronic mail addresses have been removed.
2131 2. Casts of the return value of exit have been removed.
2132 3. Casts of the argument of is.* macros have been added.
2133 4. Indentation in one section of zic.c has been fixed.
2134 5. References to dead URLs in the data files have been dealt with.
2137 Release 2005p - 2005-12-05 10:30:53 -0500
2139 "systemv", "tz-link.htm", and "zdump.c" changes
2140 (less the casts of arguments to the is* macros)
2143 Release 2005o - 2005-11-28 10:55:26 -0500
2145 Georgia, Cuba, Nicaragua, and Jordan changes by Paul Eggert
2147 zdump.c lint fixes by Arthur David Olson
2150 Release 2005n - 2005-10-03 09:44:09 -0400
2152 changes by Paul Eggert (both the Uruguay changes and the Kyrgyzstan
2156 Release 2005m - 2005-08-29 12:15:40 -0400
2158 changes by Paul Eggert (with a small tweak to the tz-art change)
2160 a declaration of an unused variable has been removed from zdump.c
2163 Release 2005l - 2005-08-22 12:06:39 -0400
2165 changes by Paul Eggert
2167 overflow/underflow checks by Arthur David Olson, minus changes to
2168 the "Theory" file about the pending addition of 64-bit data (I grow
2169 less confident of the changes being accepted with each passing day,
2170 and the changes no longer increase the data files nine-fold--there's
2171 less than a doubling in size by my local Sun's reckoning)
2174 Release 2005k - 2005-07-14 14:14:24 -0400
2176 The "leapseconds" file has been edited to reflect the recently
2177 announced leap second at the end of 2005.
2179 I've also deleted electronic mail addresses from the files as an
2183 Release 2005j - 2005-06-13 14:34:13 -0400
2185 These reflect changes to limit the length of time zone abbreviations
2186 and the characters used in those abbreviations.
2188 There are also changes to handle POSIX-style "quoted" time zone
2189 environment variables.
2191 The changes were circulated on the time zone mailing list; the only
2192 change since then was the removal of a couple of minimum-length of
2193 abbreviation checks.
2196 Release data2005i - 2005-04-21 15:04:16 -0400
2198 changes (most importantly to Nicaragua and Haiti) by Paul Eggert
2201 Release 2005h - 2005-04-04 11:24:47 -0400
2203 changes by Paul Eggert
2205 minor changes to Makefile and zdump.c to produce more useful output
2206 when doing a "make typecheck"
2209 Release 2005g - 2005-03-14 10:11:21 -0500
2211 changes by Paul Eggert (a change to current DST rules in Uruguay and
2212 an update to a link to time zone software)
2215 Release 2005f - 2005-03-01 08:45:32 -0500
2217 data and documentation changes by Paul Eggert
2220 Release 2005e - 2005-02-10 15:59:44 -0500
2225 Release code2005d - 2005-01-31 09:21:47 -0500
2227 make zic complain about links to links if the -v flag is used
2229 have "make public" do more code checking
2231 add an include to "localtime.c" for the benefit of gcc systems
2234 Release 2005c - 2005-01-17 18:36:29 -0500
2236 get better results when mktime runs on a system where time_t is double
2238 changes to the data files (most importantly to Paraguay)
2241 Release 2005b - 2005-01-10 09:19:54 -0500
2243 Get localtime and gmtime working on systems with exotic time_t types.
2245 Update the leap second commentary in the "leapseconds" file.
2248 Release 2005a - 2005-01-01 13:13:44 -0500
2253 Release code2004i - 2004-12-14 13:42:58 -0500
2255 Deal with systems where time_t is unsigned.
2258 Release code2004h - 2004-12-07 11:40:18 -0500
2260 64-bit-time_t changes
2263 Release 2004g - 2004-11-02 09:06:01 -0500
2265 update to Cuba (taking effect this weekend)
2267 other changes by Paul Eggert
2269 correction of the spelling of Oslo
2271 changed versions of difftime.c and private.h
2274 Release code2004f - 2004-10-21 10:25:22 -0400
2276 Cope with wide-ranging tm_year values.
2279 Release 2004e - 2004-10-11 14:47:21 -0400
2281 Brazil/Argentina/Israel changes by Paul Eggert
2283 changes to tz-link.htm by Paul
2285 one small fix to Makefile
2288 Release 2004d - 2004-09-22 08:27:29 -0400
2290 Avoid overflow problems when TM_YEAR_BASE is added to an integer.
2293 Release 2004c - 2004-08-11 12:06:26 -0400
2295 asctime-related changes
2297 (variants of) some of the documentation changes suggested by Paul Eggert
2300 Release 2004b - 2004-07-19 14:33:35 -0400
2302 data changes by Paul Eggert - most importantly, updates for Argentina
2305 Release 2004a - 2004-05-27 12:00:47 -0400
2307 changes by Paul Eggert
2309 Handle DST transitions that occur at the end of a month in some
2310 years but at the start of the following month in other years.
2312 Add a copy of the correspondence that's the basis for claims about
2313 DST in the Navajo Nation.
2316 Release 2003e - 2003-12-15 09:36:47 -0500
2318 changes by Arthur David Olson (primarily code changes)
2320 changes by Paul Eggert (primarily data changes)
2322 minor changes to "Makefile" and "northamerica" (in the latter case,
2323 optimization of the "Toronto" rules)
2326 Release 2003d - 2003-10-06 09:34:44 -0400
2328 changes by Paul Eggert
2331 Release 2003c - 2003-09-16 10:47:05 -0400
2333 Fix bad returns in zic.c's inleap function.
2334 Thanks to Bradley White for catching the problem!
2337 Release 2003b - 2003-09-16 07:13:44 -0400
2339 Add a "--version" option (and documentation) to the zic and zdump commands.
2341 changes to overflow/underflow checking in zic
2343 a localtime typo fix.
2345 Update the leapseconds and tz-art.htm files.
2348 Release 2003a - 2003-03-24 09:30:54 -0500
2350 changes by Paul Eggert
2352 a few additions and modifications to the tz-art.htm file
2355 Release 2002d - 2002-10-15 13:12:42 -0400
2357 changes by Paul Eggert, less the "Britain (UK)" change in iso3166.tab
2359 There's also a new time zone quote in "tz-art.htm".
2362 Release 2002c - 2002-04-04 11:55:20 -0500
2364 changes by Paul Eggert
2366 Change zic.c to avoid creating symlinks to files that don't exist.
2369 Release 2002b - 2002-01-28 12:56:03 -0500
2371 [These change notes are for Release 2002a, which was corrupted.
2372 2002b was a corrected version of 2002a.]
2374 changes by Paul Eggert
2376 Update the "leapseconds" file to note that there'll be no leap
2377 second at the end of June, 2002.
2379 Change "zic.c" to deal with a problem in handling the "Asia/Bishkek" zone.
2381 Change to "difftime.c" to avoid sizeof problems.
2384 Release 2001d - 2001-10-09 13:31:32 -0400
2386 changes by Paul Eggert
2389 Release 2001c - 2001-06-05 13:59:55 -0400
2391 changes by Paul Eggert and Andrew Brown
2394 Release 2001b - 2001-04-05 16:44:38 -0400
2396 changes by Paul Eggert (modulo jnorgard's typo fix)
2398 tz-art.htm has been HTMLified.
2401 Release 2001a - 2001-03-13 12:57:44 -0500
2403 changes by Paul Eggert
2405 An addition to the "leapseconds" file: comments with the text of the
2406 latest IERS leap second notice.
2408 Trailing white space has been removed from data file lines, and
2409 repeated spaces in "Rule Jordan" lines in the "asia" file have been
2413 Release 2000h - 2000-12-14 15:33:38 -0500
2415 changes by Paul Eggert
2417 one typo fix in the "art" file
2419 With providence, this is the last update of the millennium.
2422 Release 2000g - 2000-10-10 11:35:22 -0400
2424 changes by Paul Eggert
2426 correction of John Mackin's name submitted by Robert Elz
2428 Garry Shandling's Daylight Saving Time joke (!?!) from the recent
2429 Emmy Awards broadcast.
2432 Release 2000f - 2000-08-10 09:31:58 -0400
2434 changes by Paul Eggert
2436 Added information in "tz-art.htm" on a Seinfeld reference to DST.
2438 Error checking and messages in the "yearistype" script have been
2442 Release 2000e - 2000-07-31 09:27:54 -0400
2444 data changes by Paul Eggert
2446 a change to the default value of the defined constant HAVE_STRERROR
2448 the addition of a Dave Barry quote on DST to the tz-arts file
2451 Release 2000d - 2000-04-20 15:43:04 -0400
2453 changes to the documentation and code of strftime for C99 conformance
2455 a bug fix for date.c
2457 These are based on (though modified from) changes by Paul Eggert.
2460 Release 2000c - 2000-03-04 10:31:43 -0500
2462 changes by Paul Eggert
2465 Release 2000b - 2000-02-21 12:16:29 -0500
2467 changes by Paul Eggert and Joseph Myers
2469 modest tweaks to the tz-art.htm and tz-link.htm files
2472 Release 2000a - 2000-01-18 09:21:26 -0500
2474 changes by Paul Eggert
2476 The two hypertext documents have also been renamed.
2479 Release code1999i-data1999j - 1999-11-15 18:43:22 -0500
2481 Paul Eggert's changes
2483 additions to the "zic" manual page and the "Arts.htm" file
2486 Release code1999h-data1999i - 1999-11-08 14:55:21 -0500
2491 Release data1999h - 1999-10-07 03:50:29 -0400
2493 changes by Paul Eggert to "europe" (most importantly, fixing
2494 Lithuania and Estonia)
2497 Release 1999g - 1999-09-28 11:06:18 -0400
2499 data changes by Paul Eggert (most importantly, the change for
2500 Lebanon that buys correctness for this coming Sunday)
2502 The "code" file contains changes to "Makefile" and "checktab.awk" to
2503 allow better checking of time zone files before they are published.
2506 Release 1999f - 1999-09-23 09:48:14 -0400
2508 changes by Arthur David Olson and Paul Eggert
2511 Release 1999e - 1999-08-17 15:20:54 -0400
2513 changes circulated by Paul Eggert, although the change to handling
2514 of DST-specifying time zone names has been commented out for now
2515 (search for "XXX" in "localtime.c" for details). These files also
2516 do not make any changes to the start of DST in Brazil.
2518 In addition to Paul's changes, there are updates to "Arts.htm" and
2522 Release 1999d - 1999-03-30 11:31:07 -0500
2524 changes by Paul Eggert
2526 The Makefile's "make public" rule has also been changed to do a test
2527 compile of each individual time zone data file (which should help
2528 avoid problems such as the one we had with Nicosia).
2531 Release 1999c - 1999-03-25 09:47:47 -0500
2533 changes by Paul Eggert, most importantly the change for Chile.
2536 Release 1999b - 1999-02-01 17:51:44 -0500
2538 changes by Paul Eggert
2540 code changes (suggested by Mani Varadarajan, mani at be.com) for
2541 correct handling of symbolic links when building using a relative directory
2543 code changes to generate correct messages for failed links
2545 updates to the URLs in Arts.htm
2548 Release 1999a - 1999-01-19 16:20:29 -0500
2550 error message internationalizations and corrections in zic.c and
2551 zdump.c (as suggested by Vladimir Michl, vladimir.michl at upol.cz,
2555 Release code1998h-data1998i - 1998-10-01 09:56:10 -0400
2557 changes for Brazil, Chile, and Germany
2559 support for use of "24:00" in the input files for the time zone compiler
2562 Release code1998g-data1998h - 1998-09-24 10:50:28 -0400
2564 changes by Paul Eggert
2566 correction to a define in the "private.h" file
2569 Release data1998g - 1998-08-11 03:28:35 -0000
2570 [tzdata1998g.tar.gz is missing!]
2572 Lithuanian change provided by mgedmin at pub.osf.it
2574 Move creation of the GMT link with Etc/GMT to "etcetera" (from
2575 "backward") to ensure that the GMT file is created even where folks
2576 don't want the "backward" links (as suggested by Paul Eggert).
2579 Release data1998f - 1998-07-20 13:50:00 -0000
2580 [tzdata1998f.tar.gz is missing!]
2582 Update the "leapseconds" file to include the newly-announced
2583 insertion at the end of 1998.
2586 Release code1998f - 1998-06-01 10:18:31 -0400
2588 addition to localtime.c by Guy Harris
2591 Release 1998e - 1998-05-28 09:56:26 -0400
2593 The Makefile is changed to produce zoneinfo-posix rather than
2594 zoneinfo/posix, and to produce zoneinfo-leaps rather than
2597 data changes by Paul Eggert
2599 changes from Guy Harris to provide asctime_r and ctime_r
2601 A usno1998 file (substantially identical to usno1997) has been added.
2604 Release 1998d - 1998-05-14 11:58:34 -0400
2606 changes to comments (in particular, elimination of references to CIA maps).
2607 "Arts.htm", "WWW.htm", "asia", and "australasia" are the only places
2608 where changes occur.
2611 Release 1998c - 1998-02-28 12:32:26 -0500
2613 changes by Paul Eggert (save the "French correction," on which I'll
2614 wait for the dust to settle)
2618 changes and additions to Arts.htm
2621 Release 1998b - 1998-01-17 14:31:51 -0500
2623 URL cleanups and additions
2626 Release 1998a - 1998-01-13 12:37:35 -0500
2628 changes by Paul Eggert
2631 Release code1997i-data1997k - 1997-12-29 09:53:41 -0500
2633 changes by Paul Eggert, with minor modifications from Arthur David
2634 Olson to make the files more browser friendly
2637 Release code1997h-data1997j - 1997-12-18 17:47:35 -0500
2639 minor changes to put "TZif" at the start of each time zone information file
2641 a rule has also been added to the Makefile so you can
2643 to just recompile the zone information files (rather than doing a
2644 full "make install" with its other effects).
2647 Release data1997i - 1997-10-07 08:45:38 -0400
2649 changes to Africa by Paul Eggert
2652 Release code1997g-data1997h - 1997-09-04 16:56:54 -0400
2654 corrections for Uruguay (and other locations)
2656 Arthur David Olson's simple-minded fix allowing mktime to both
2657 correctly handle leap seconds and correctly handle tm_sec values
2658 upon which arithmetic has been performed.
2661 Release code1997f-data1997g - 1997-07-19 13:15:02 -0400
2663 Paul Eggert's updates
2665 a small change to a function prototype;
2667 "Music" has been renamed "Arts.htm", HTMLified, and augmented to
2668 include information on Around the World in Eighty Days.
2671 Release code1997e-data1997f - 1997-05-03 18:52:34 -0400
2673 fixes to zic's error handling
2675 changes inspired by the item circulated on Slovenia
2677 The description of Web resources has been HTMLified for browsing
2680 A new piece of tz-related music has been added to the "Music" file.
2683 Release code1997d-data1997e - 1997-03-29 12:48:52 -0500
2685 Paul Eggert's latest suggestions
2688 Release code1997c-data1997d - 1997-03-07 20:37:54 -0500
2690 changes to "zic.c" to correct performance of the "-s" option
2692 a new file "usno1997"
2695 Release data1997c - 1997-03-04 09:58:18 -0500
2700 Release 1997b - 1997-02-27 18:34:19 -0500
2702 The data file incorporates the 1997 leap second.
2704 The code file incorporates Arthur David Olson's take on the
2705 zic/multiprocessor/directory-creation situation.
2708 Release 1997a - 1997-01-21 09:11:10 -0500
2710 Paul Eggert's Antarctica (and other changes)
2712 Arthur David Olson finessed the "getopt" issue by checking against
2713 both -1 and EOF (regardless of POSIX, SunOS 4.1.1's manual says -1
2714 is returned while SunOS 5.5's manual says EOF is returned).
2717 Release code1996o-data1996n - 1996-12-27 21:42:05 -0500
2719 Paul Eggert's latest changes
2722 Release code1996n - 1996-12-16 09:42:02 -0500
2724 link snapping fix from Bruce Evans (via Garrett Wollman)
2727 Release data1996m - 1996-11-24 02:37:34 -0000
2728 [tzdata1996m.tar.gz is missing!]
2730 Paul Eggert's batch of changes
2733 Release code1996m-data1996l - 1996-11-05 14:00:12 -0500
2735 No functional changes here; the files have simply been changed to
2736 make more use of ISO style dates in comments. The names of the above
2737 files now include the year in full.
2740 Release code96l - 1996-09-08 17:12:20 -0400
2742 tzcode96k was missing a couple of pieces.
2745 Release 96k - 1996-09-08 16:06:22 -0400
2747 the latest round of changes from Paul Eggert
2749 the recent Year 2000 material
2752 Release code96j - 1996-07-30 13:18:53 -0400
2754 Set sp->typecnt as suggested by Timothy Patrick Murphy.
2757 Release code96i - 1996-07-27 20:11:35 -0400
2759 Paul's suggested patch for strftime %V week numbers
2762 Release data96i - 1996-07-01 18:13:04 -0400
2764 "northamerica" and "europe" changes by Paul Eggert
2767 Release code96h - 1996-06-05 08:02:21 -0400
2769 fix for handling transitions specified in Universal Time
2771 Some "public domain" notices have also been added.
2774 Release code96g - 1996-05-16 14:00:26 -0400
2776 fix for the simultaneous-DST-and-zone-change challenge
2779 Release data96h - 1996-05-09 17:40:51 -0400
2781 changes by Paul Eggert
2784 Release code96f-data96g - 1996-05-03 03:09:59 -0000
2785 [tzcode96f.tar.gz + tzdata96g.tar.gz are both missing!]
2787 The changes get us some of the way to fixing the problems noted in Paul
2788 Eggert's letter yesterday (in addition to a few others). The approach
2789 has been to make zic a bit smarter about figuring out what time zone
2790 abbreviations apply just after the time specified in the "UNTIL" part
2791 of a zone line. Putting the smarts in zic means avoiding having
2792 transition times show up in both "Zone" lines and "Rule" lines, which
2793 in turn avoids multiple transition time entries in time zone files.
2794 (This also makes the zic input files such as "europe" a bit shorter and
2795 should ease maintenance.)
2798 Release data96f - 1996-04-19 19:20:03 -0000
2799 [tzdata96f.tar.gz is missing!]
2801 The only changes are to the "northamerica" file; the time zone
2802 abbreviation for Denver is corrected to MST (and MDT), and the
2803 comments for Mexico have been updated.
2806 Release data96e - 1996-03-19 17:37:26 -0500
2808 Proposals by Paul Eggert, in particular the Portugal change that
2809 comes into play at the end of this month.
2812 Release data96d - 1996-03-18 20:49:39 -0500
2817 Release code96e - 1996-02-29 15:43:27 -0000
2818 [tzcode96e.tar.gz is missing!]
2820 internationalization changes and the fix to the documentation for strftime
2823 Release code96d-data96c - 1996-02-12 11:05:27 -0500
2825 The "code" file simply updates Bob Kridle's electronic address.
2827 The "data" file updates rules for Mexico.
2830 Release data96b - 1996-01-27 15:44:42 -0500
2835 Release code96c - 1996-01-16 16:58:15 -0500
2837 leap-year streamlining and binary-search changes
2842 Release code96b - 1996-01-10 20:42:39 -0500
2844 fixes and enhancements from Paul Eggert, including code that
2845 emulates the behavior of recent versions of the SunOS "date"
2849 Release 96a - 1996-01-06 09:08:24 -0500
2853 fixes to strftime.c for correct ISO 8601 week number generation,
2854 plus support for two new formats ('G' and 'g') to give ISO 8601 year
2855 numbers (which are not necessarily the same as calendar year numbers)
2858 Release code95i-data95m - 1995-12-21 12:46:47 -0500
2860 The latest revisions from Paul Eggert are included, the usno1995
2861 file has been updated, and a new file ("WWW") covering useful URLs
2865 Release code95h-data95l - 1995-12-19 18:10:12 -0500
2867 A simplification of a macro definition, a change to data for Sudan,
2868 and (for last minute shoppers) notes in the "Music" file on the CD
2872 Release code95g-data95k - 1995-10-30 10:32:47 -0500
2874 (slightly reformatted) 8-bit-clean proposed patch
2876 minor patch: US/Eastern -> America/New_York
2878 snapshot of the USNO's latest data ("usno1995")
2880 some other minor cleanups
2883 Release code95f-data95j - 1995-10-28 21:01:34 -0000
2884 [tzcode95f.tar.gz + tzdata95j.tar.gz are both missing!]
2888 support for 64-bit time_t's
2890 optimization in localtime.c
2893 Release code95e - 1995-10-13 13:23:57 -0400
2895 the mktime change to scan from future to past when trying to find time zone
2899 Release data95i - 1995-09-26 10:43:26 -0400
2901 For Canada/Central, guess that the Sun customer's "one week too
2902 early" was just a approximation, and the true error is one month
2903 too early. This is consistent with the rest of Canada.
2906 Release data95h - 1995-09-21 11:26:48 -0400
2908 latest changes from Paul Eggert
2911 Release code95d - 1995-09-14 11:14:45 -0400
2913 the addition of a "Music" file, which documents four recorded
2914 versions of the tune "Save That Time".
2917 Release data95g - 1995-09-01 17:21:36 -0400
2919 "yearistype" correction
2922 Release data95f - 1995-08-28 20:46:56 -0400
2924 Paul Eggert's change to the australasia file
2927 Release data95e - 1995-07-08 18:02:34 -0400
2929 The only change is a leap second at the end of this year.
2930 Thanks to Bradley White for forwarding news on the leap second.
2933 Release data95d - 1995-07-03 13:26:22 -0400
2935 Paul Eggert's changes
2938 Release data95c - 1995-07-02 19:19:28 -0400
2940 changes to "asia", "backward", "europe", and "southamerica"
2941 (read: northamericacentrics need not apply)
2944 Release code95c - 1995-03-13 14:00:46 -0500
2946 one-line fix for sign extension problems in detzcode
2949 Release 95b - 1995-03-04 11:22:38 -0500
2951 Minor changes in both:
2953 The "code" file contains a workaround for the lack of "unistd.h" in
2954 Microsoft C++ version 7.
2956 The "data" file contains a fixed "Link" for America/Shiprock.
2959 Release 94h - 1994-12-10 12:51:14 -0500
2963 * incorporate the changes to "zdump" and "date" to make changes to
2964 the "TZ" environment variable permanent;
2966 * incorporate the table changes by Paul Eggert;
2968 * include (and document) support for universal time specifications in
2969 data files - but do not (yet) include use of this feature in the
2972 Think of this as "TZ Classic" - the software has been set up not to break if
2973 universal time shows up in its input, and data entries have been
2974 left as is so as not to break existing implementations.
2977 Release data94f - 1994-08-20 12:56:09 -0400
2979 (with thanks!) the latest data updates from Paul Eggert
2982 Release data94e - 1994-06-04 13:13:53 -0400
2987 Release code94g - 1994-05-05 12:14:07 -0400
2989 fix missing "optind.c" and a reference to it in the Makefile
2992 Release code94f - 1994-05-05 13:00:33 -0000
2993 [tzcode94f.tar.gz is missing!]
2995 changes to avoid overflow in difftime, as well as changes to cope
2996 with the 52/53 challenge in strftime
2999 Release code94e - 1994-03-30 23:32:59 -0500
3001 change for the benefit of PCTS
3004 Release 94d - 1994-02-24 15:42:25 -0500
3006 Avoid clashes with POSIX semantics for zones such as GMT+4.
3008 Some other very minor housekeeping is also present.
3011 Release code94c - 1994-02-10 08:52:40 -0500
3013 Fix bug where mkdirs was broken unless you compile with
3014 -fwritable-strings (which is generally losing to do).
3017 Release 94b - 1994-02-07 10:04:33 -0500
3019 work by Paul Eggert who notes:
3021 I found another book of time zone histories by E W Whitman; it's not
3022 as extensive as Shanks but has a few goodies of its own. I used it
3023 to update the tables. I also fixed some more as a result of
3024 correspondence with Adam David and Peter Ilieve, and move some stray
3025 links from 'europe' to 'backward'. I corrected some scanning errors
3028 As far as the code goes, I fixed zic to allow years in the range
3029 INT_MIN to INT_MAX; this fixed a few boundary conditions around 1900.
3030 And I cleaned up the zic documentation a little bit.
3033 Release data94a - 1994-02-03 08:58:54 -0500
3035 It simply incorporates the recently announced leap second into the
3039 Release 93g - 1993-11-22 17:28:27 -0500
3041 Paul Eggert has provided a good deal of historic information (based
3042 on Shanks), and there are some code changes to deal with the buglets
3043 that crawled out in dealing with the new information.
3046 Release 93f - 1993-10-15 12:27:46 -0400
3048 Paul Eggert's changes
3051 Release 93e - 1993-09-05 21:21:44 -0400
3053 This has updated data for Israel, England, and Kwajalein. There's
3054 also an update to "zdump" to cope with Kwajalein's 24-hour jump.
3055 Thanks to Paul Eggert and Peter Ilieve for the changes.
3058 Release 93d - 1993-06-17 23:34:17 -0400
3060 new fix and new data on Israel
3063 Release 93c - 1993-06-06 19:31:55 -0400
3068 Release 93b - 1993-02-02 14:53:58 -0500
3070 updated "leapseconds" file
3073 Release 93 - 1993-01-08 07:01:06 -0500
3075 At kre's suggestion, the package has been split in two - a code piece
3076 (which also includes documentation) that's only of use to folks who
3077 want to recompile things and a data piece useful to anyone who can
3080 The new version has a few changes to the data files, a few
3081 portability changes, and an off-by-one fix (with thanks to
3082 Tom Karzes at deshaw.com for providing a description and a
3086 Release 92c - 1992-11-21 17:35:36 -0000
3087 [tz92c.tar.Z is missing!]
3089 The fallout from the latest round of DST transitions.
3091 There are changes for Portugal, Saskatchewan, and "Pacific-New";
3092 there's also a change to "zic.c" that makes it portable to more systems.
3095 Release 92 - 1992-04-25 18:17:03 -0000
3096 [tz92.tar.Z is missing!]
3098 By popular demand (well, at any rate, following a request by kre at munnari)
3101 The 1989 update of the time zone package featured:
3103 * POSIXization (including interpretation of POSIX-style TZ environment
3104 variables, provided by Guy Harris),
3105 * ANSIfication (including versions of "mktime" and "difftime"),
3106 * SVIDulation (an "altzone" variable)
3107 * MACHination (the "gtime" function)
3108 * corrections to some time zone data (including corrections to the rules
3109 for Great Britain and New Zealand)
3110 * reference data from the United States Naval Observatory for folks who
3111 want to do additional time zones
3112 * and the 1989 data for Saudi Arabia.
3114 (Since this code will be treated as "part of the implementation" in some
3115 places and as "part of the application" in others, there's no good way to
3116 name functions, such as timegm, that are not part of the proposed ANSI C
3117 standard; such functions have kept their old, underscore-free names in this
3120 And the "dysize" function has disappeared; it was present to allow
3121 compilation of the "date" command on old BSD systems, and a version of "date"
3122 is now provided in the package. The "date" command is not created when you
3123 "make all" since it may lack options provided by the version distributed with
3124 your operating system, or may not interact with the system in the same way
3125 the native version does.
3127 Since POSIX frowns on correct leap second handling, the default behavior of
3128 the "zic" command (in the absence of a "-L" option) has been changed to omit
3129 leap second information from its output files.
3135 This file contains copies of the part of each release announcement
3136 that talks about the changes in that release. The text has been
3137 adapted and reformatted for the purposes of this file.
3139 Typically a release R consists of a pair of tarball files,
3140 tzcodeR.tar.gz and tzdataR.tar.gz. However, some releases (e.g.,
3141 code2010a, data2012c) consist of just one or the other tarball, and a
3142 few (e.g., code2012c-data2012d) have tarballs with mixed version
3145 Release time stamps are taken from the release's commit (for newer,
3146 git releases), from the newest file in the tarball (for older
3147 releases, where this info is available) or from the email announcing
3148 the release (if all else fails; these are marked with a time zone of
3149 -0000 and an "is missing!" comment).
3151 Earlier versions of the code and data were not announced on the tz
3152 list and are not summarized here.
3154 This file is in the public domain.