1 News for the tz database
3 Release 2015a - 2015-01-29 22:35:20 -0800
5 Changes affecting future time stamps
7 The Mexican state of Quintana Roo, represented by America/Cancun,
8 will shift from Central Time with DST to Eastern Time without DST
9 on 2015-02-01 at 02:00. (Thanks to Steffen Thorsen and Gwillim Law.)
11 Chile will not change clocks in April or thereafter; its new standard time
12 will be its old daylight saving time. This affects America/Santiago,
13 Pacific/Easter, and Antarctica/Palmer. (Thanks to Juan Correa.)
15 New leap second 2015-06-30 23:59:60 UTC as per IERS Bulletin C 49.
16 (Thanks to Tim Parenti.)
18 Changes affecting past time stamps
20 Iceland observed DST in 1919 and 1921, and its 1939 fallback
21 transition was Oct. 29, not Nov. 29. Remove incorrect data from
22 Shanks about time in Iceland between 1837 and 1908.
24 Some more zones have been turned into links, when they differed
25 from existing zones only for older time stamps. As usual,
26 these changes affect UTC offsets in pre-1970 time stamps only.
27 Their old contents have been moved to the 'backzone' file.
28 The affected zones are: Asia/Aden, Asia/Bahrain, Asia/Kuwait,
31 Changes affecting code
33 tzalloc now scrubs time zone abbreviations compatibly with the way
34 that tzset always has, by replacing invalid bytes with '_' and by
35 shortening too-long abbreviations.
37 tzselect ports to POSIX awk implementations, no longer mishandles
38 POSIX TZ settings when GNU awk is used, and reports POSIX TZ
39 settings to the user. (Thanks to Stefan Kuhn.)
41 Changes affecting build procedure
43 'make check' now checks for links to links in the data.
44 One such link (for Africa/Asmera) has been fixed.
45 (Thanks to Stephen Colebourne for pointing out the problem.)
47 Changes affecting commentary
49 The leapseconds file commentary now mentions the expiration date.
50 (Problem reported by Martin Burnicki.)
52 Update Mexican Library of Congress URL.
55 Release 2014j - 2014-11-10 17:37:11 -0800
57 Changes affecting current and future time stamps
59 Turks & Caicos' switch from US eastern time to UTC-4 year-round
60 did not occur on 2014-11-02 at 02:00. It's currently scheduled
61 for 2015-11-01 at 02:00. (Thanks to Chris Walton.)
63 Changes affecting past time stamps
65 Many pre-1989 time stamps have been corrected for Asia/Seoul and
66 Asia/Pyongyang, based on sources for the Korean-language Wikipedia
67 entry for time in Korea. (Thanks to Sanghyuk Jung.) Also, no
68 longer guess that Pyongyang mimicked Seoul time after World War II,
69 as this is politically implausible.
71 Some more zones have been turned into links, when they differed
72 from existing zones only for older time stamps. As usual,
73 these changes affect UTC offsets in pre-1970 time stamps only.
74 Their old contents have been moved to the 'backzone' file.
75 The affected zones are: Africa/Addis_Ababa, Africa/Asmara,
76 Africa/Dar_es_Salaam, Africa/Djibouti, Africa/Kampala,
77 Africa/Mogadishu, Indian/Antananarivo, Indian/Comoro, and
80 Changes affecting commentary
82 The commentary is less enthusiastic about Shanks as a source,
83 and is more careful to distinguish UT from UTC.
86 Release 2014i - 2014-10-21 22:04:57 -0700
88 Changes affecting future time stamps
90 Pacific/Fiji will observe DST from 2014-11-02 02:00 to 2015-01-18 03:00.
91 (Thanks to Ken Rylander for the heads-up.) Guess that future
92 years will use a similar pattern.
94 A new Zone Pacific/Bougainville, for the part of Papua New Guinea
95 that plans to switch from UTC+10 to UTC+11 on 2014-12-28 at 02:00.
96 (Thanks to Kiley Walbom for the heads-up.)
98 Changes affecting time zone abbreviations
100 Since Belarus is not changing its clocks even though Moscow is,
101 the time zone abbreviation in Europe/Minsk is changing from FET
102 to its more-traditional value MSK on 2014-10-26 at 01:00.
103 (Thanks to Alexander Bokovoy for the heads-up about Belarus.)
105 The new abbreviation IDT stands for the pre-1976 use of UT+8 in
106 Indochina, to distinguish it better from ICT (UT+7).
108 Changes affecting past time stamps
110 Many time stamps have been corrected for Asia/Ho_Chi_Minh before 1976
111 (thanks to Trần Ngọc Quân for an indirect pointer to Trần Tiến Bình's
112 authoritative book). Asia/Ho_Chi_Minh has been added to
113 zone1970.tab, to give tzselect users in Vietnam two choices,
114 since north and south Vietnam disagreed after our 1970 cutoff.
116 Asia/Phnom_Penh and Asia/Vientiane have been turned into links, as
117 they differed from existing zones only for older time stamps. As
118 usual, these changes affect pre-1970 time stamps only. Their old
119 contents have been moved to the 'backzone' file.
121 Changes affecting code
123 The time-related library functions now set errno on failure, and
124 some crashes in the new tzalloc-related library functions have
125 been fixed. (Thanks to Christos Zoulas for reporting most of
126 these problems and for suggesting fixes.)
128 If USG_COMPAT is defined and the requested time stamp is standard time,
129 the tz library's localtime and mktime functions now set the extern
130 variable timezone to a value appropriate for that time stamp; and
131 similarly for ALTZONE, daylight saving time, and the altzone variable.
132 This change is a companion to the tzname change in 2014h, and is
133 designed to make timezone and altzone more compatible with tzname.
135 The tz library's functions now set errno to EOVERFLOW if they fail
136 because the result cannot be represented. ctime and ctime_r now
137 return NULL and set errno when a time stamp is out of range, rather
138 than having undefined behavior.
140 Some bugs associated with the new 2014g functions have been fixed.
141 This includes a bug that largely incapacitated the new functions
142 time2posix_z and posix2time_z. (Thanks to Christos Zoulas.)
143 It also includes some uses of uninitialized variables after tzalloc.
144 The new code uses the standard type 'ssize_t', which the Makefile
145 now gives porting advice about.
147 Changes affecting commentary
149 Updated URLs for NRC Canada (thanks to Matt Johnson and Brian Inglis).
152 Release 2014h - 2014-09-25 18:59:03 -0700
154 Changes affecting past time stamps
156 America/Jamaica's 1974 spring-forward transition was Jan. 6, not Apr. 28.
158 Shanks says Asia/Novokuznetsk switched from LMT (not "NMT") on 1924-05-01,
159 not 1920-01-06. The old entry was based on a misinterpretation of Shanks.
161 Some more zones have been turned into links, when they differed
162 from existing zones only for older time stamps. As usual,
163 these changes affect UTC offsets in pre-1970 time stamps only.
164 Their old contents have been moved to the 'backzone' file.
165 The affected zones are: Africa/Blantyre, Africa/Bujumbura,
166 Africa/Gaborone, Africa/Harare, Africa/Kigali, Africa/Lubumbashi,
167 Africa/Lusaka, Africa/Maseru, and Africa/Mbabane.
169 Changes affecting code
171 zdump -V and -v now output gmtoff= values on all platforms,
172 not merely on platforms defining TM_GMTOFF.
174 The tz library's localtime and mktime functions now set tzname to a value
175 appropriate for the requested time stamp, and zdump now uses this
176 on platforms not defining TM_ZONE, fixing a 2014g regression.
177 (Thanks to Tim Parenti for reporting the problem.)
179 The tz library no longer sets tzname if localtime or mktime fails.
181 zdump -c no longer mishandles transitions near year boundaries.
182 (Thanks to Tim Parenti for reporting the problem.)
184 An access to uninitalized data has been fixed.
185 (Thanks to Jörg Richter for reporting the problem.)
187 When THREAD_SAFE is defined, the code ports to the C11 memory model.
188 A memory leak has been fixed if ALL_STATE and THREAD_SAFE are defined
189 and two threads race to initialize data used by gmtime-like functions.
190 (Thanks to Andy Heninger for reporting the problems.)
192 Changes affecting build procedure
194 'make check' now checks better for properly-sorted data.
196 Changes affecting documentation and commentary
198 zdump's gmtoff=N output is now documented, and its isdst=D output
199 is now documented to possibly output D values other than 0 or 1.
201 zdump -c's treatment of years is now documented to use the
202 Gregorian calendar and Universal Time without leap seconds,
203 and its behavior at cutoff boundaries is now documented better.
204 (Thanks to Arthur David Olson and Tim Parenti for reporting the problems.)
206 Programs are now documented to use the proleptic Gregorian calendar.
207 (Thanks to Alan Barrett for the suggestion.)
209 Fractional-second GMT offsets have been documented for civil time
210 in 19th-century Chennai, Jakarta, and New York.
213 Release 2014g - 2014-08-28 12:31:23 -0700
215 Changes affecting future time stamps
217 Turks & Caicos is switching from US eastern time to UTC-4 year-round,
218 modeled as a switch from EST/EDT to AST on 2014-11-02 at 02:00.
219 [As noted in 2014j, this switch was later delayed.]
221 Changes affecting past time stamps
223 Time in Russia or the USSR before 1926 or so has been corrected by
224 a few seconds in the following zones: Asia/Irkutsk,
225 Asia/Krasnoyarsk, Asia/Omsk, Asia/Samarkand, Asia/Tbilisi,
226 Asia/Vladivostok, Asia/Yakutsk, Europe/Riga, Europe/Samara. For
227 Asia/Yekaterinburg the correction is a few minutes. (Thanks to
230 The Portuguese decree of 1911-05-26 took effect on 1912-01-01.
231 This affects 1911 time stamps in Africa/Bissau, Africa/Luanda,
232 Atlantic/Azores, and Atlantic/Madeira. Also, Lisbon's pre-1912
233 GMT offset was -0:36:45 (rounded from -0:36:44.68), not -0:36:32.
234 (Thanks to Stephen Colebourne for pointing to the decree.)
236 Asia/Dhaka ended DST on 2009-12-31 at 24:00, not 23:59.
238 A new file 'backzone' contains data which may appeal to
239 connoisseurs of old time stamps, although it is out of scope for
240 the tz database, is often poorly sourced, and contains some data
241 that is known to be incorrect. The new file is not recommended
242 for ordinary use and its entries are not installed by default.
243 (Thanks to Lester Caine for the high-quality Jersey, Guernsey, and
244 Isle of Man entries.)
246 Some more zones have been turned into links, when they differed
247 from existing zones only for older time stamps. As usual,
248 these changes affect UTC offsets in pre-1970 time stamps only.
249 Their old contents have been moved to the 'backzone' file.
250 The affected zones are: Africa/Bangui, Africa/Brazzaville,
251 Africa/Douala, Africa/Kinshasa, Africa/Libreville, Africa/Luanda,
252 Africa/Malabo, Africa/Niamey, and Africa/Porto-Novo.
254 Changes affecting code
256 Unless NETBSD_INSPIRED is defined to 0, the tz library now
257 supplies functions for creating and using objects that represent
258 time zones. The new functions are tzalloc, tzfree, localtime_rz,
259 mktime_z, and (if STD_INSPIRED is also defined) posix2time_z and
260 time2posix_z. They are intended for performance: for example,
261 localtime_rz (unlike localtime_r) is trivially thread-safe without
262 locking. (Thanks to Christos Zoulas for proposing NetBSD-inspired
263 functions, and to Alan Barrett and Jonathan Lennox for helping to
266 zdump now builds with the tz library unless USE_LTZ is defined to 0,
267 This lets zdump use tz features even if the system library lacks them.
268 To build zdump with the system library, use 'make CFLAGS=-DUSE_LTZ=0
269 TZDOBJS=zdump.o CHECK_TIME_T_ALTERNATIVES='.
271 zdump now uses localtime_rz if available, as it's significantly faster,
272 and it can help zdump better diagnose invalid time zone names.
273 Define HAVE_LOCALTIME_RZ to 0 to suppress this. HAVE_LOCALTIME_RZ
274 defaults to 1 if NETBSD_INSPIRED && USE_LTZ. When localtime_rz is
275 not available, zdump now uses localtime_r and tzset if available,
276 as this is a bit cleaner and faster than plain localtime. Compile
277 with -DHAVE_LOCALTIME_R=0 and/or -DHAVE_TZSET=0 if your system
278 lacks these two functions.
280 If THREAD_SAFE is defined to 1, the tz library is now thread-safe.
281 Although not needed for tz's own applications, which are single-threaded,
282 this supports POSIX better if the tz library is used in multithreaded apps.
284 Some crashes have been fixed when zdump or the tz library is given
285 invalid or outlandish input.
287 The tz library no longer mishandles leap seconds on platforms with
288 unsigned time_t in time zones that lack ordinary transitions after 1970.
290 The tz code now attempts to infer TM_GMTOFF and TM_ZONE if not
291 already defined, to make it easier to configure on common platforms.
292 Define NO_TM_GMTOFF and NO_TM_ZONE to suppress this.
294 Unless the new macro UNINIT_TRAP is defined to 1, the tz code now
295 assumes that reading uninitialized memory yields garbage values
296 but does not cause other problems such as traps.
298 If TM_GMTOFF is defined and UNINIT_TRAP is 0, mktime is now
299 more likely to guess right for ambiguous time stamps near
300 transitions where tm_isdst does not change.
302 If HAVE_STRFTIME_L is defined to 1, the tz library now defines
303 strftime_l for compatibility with recent versions of POSIX.
304 Only the C locale is supported, though. HAVE_STRFTIME_L defaults
305 to 1 on recent POSIX versions, and to 0 otherwise.
307 tzselect -c now uses a hybrid distance measure that works better
308 in Africa. (Thanks to Alan Barrett for noting the problem.)
310 The C source code now ports to NetBSD when GCC_DEBUG_FLAGS is used,
311 or when time_tz is defined.
313 When HAVE_UTMPX_H is set the 'date' command now builds on systems
314 whose <utmpx.h> file does not define WTMPX_FILE, and when setting
315 the date it updates the wtmpx file if _PATH_WTMPX is defined.
316 This affects GNU/Linux and similar systems.
318 For easier maintenance later, some C code has been simplified,
319 some lint has been removed, and the code has been tweaked so that
320 plain 'make' is more likely to work.
322 The C type 'bool' is now used for boolean values, instead of 'int'.
324 The long-obsolete LOCALE_HOME code has been removed.
326 The long-obsolete 'gtime' function has been removed.
328 Changes affecting build procedure
330 'zdump' no longer links in ialloc.o, as it's not needed.
332 'make check_time_t_alternatives' no longer assumes GNU diff.
334 Changes affecting distribution tarballs
336 The files checktab.awk and zoneinfo2tdf.pl are now distributed in
337 the tzdata tarball instead of the tzcode tarball, since they help
338 maintain the data. The NEWS and Theory files are now also
339 distributed in the tzdata tarball, as they're relevant for data.
340 (Thanks to Alan Barrett for pointing this out.) Also, the
341 leapseconds.awk file is no longer distributed in the tzcode
342 tarball, since it belongs in the tzdata tarball (where 2014f
343 inadvertently also distributed it).
345 Changes affecting documentation and commentary
347 A new file CONTRIBUTING is distributed. (Thanks to Tim Parenti for
348 suggesting a CONTRIBUTING file, and to Tony Finch and Walter Harms
351 The man pages have been updated to use function prototypes,
352 to document thread-safe variants like localtime_r, and to document
353 the NetBSD-inspired functions tzalloc, tzfree, localtime_rz, and
356 The fields in Link lines have been renamed to be more descriptive
357 and more like the parameters of 'ln'. LINK-FROM has become TARGET,
358 and LINK-TO has become LINK-NAME.
360 tz-link.htm mentions the IETF's tzdist working group; Windows
361 Runtime etc. (thanks to Matt Johnson); and HP-UX's tztab.
363 Some broken URLs have been fixed in the commentary. (Thanks to
366 Commentary about Philippines DST has been updated, and commentary
367 on pre-1970 time in India has been added.
370 Release 2014f - 2014-08-05 17:42:36 -0700
372 Changes affecting future time stamps
374 Russia will subtract an hour from most of its time zones on 2014-10-26
375 at 02:00 local time. (Thanks to Alexander Krivenyshev.)
376 There are a few exceptions: Magadan Oblast (Asia/Magadan) and Zabaykalsky
377 Krai are subtracting two hours; conversely, Chukotka Autonomous Okrug
378 (Asia/Anadyr), Kamchatka Krai (Asia/Kamchatka), Kemerovo Oblast
379 (Asia/Novokuznetsk), and the Samara Oblast and the Udmurt Republic
380 (Europe/Samara) are not changing their clocks. The changed zones are
381 Europe/Kaliningrad, Europe/Moscow, Europe/Simferopol, Europe/Volgograd,
382 Asia/Yekaterinburg, Asia/Omsk, Asia/Novosibirsk, Asia/Krasnoyarsk,
383 Asia/Irkutsk, Asia/Yakutsk, Asia/Vladivostok, Asia/Khandyga,
384 Asia/Sakhalin, and Asia/Ust-Nera; Asia/Magadan will have two hours
385 subtracted; and Asia/Novokuznetsk's time zone abbreviation is affected,
386 but not its UTC offset. Two zones are added: Asia/Chita (split
387 from Asia/Yakutsk, and also with two hours subtracted) and
388 Asia/Srednekolymsk (split from Asia/Magadan, but with only one hour
389 subtracted). (Thanks to Tim Parenti for much of the above.)
391 Changes affecting time zone abbreviations
393 Australian eastern time zone abbreviations are now AEST/AEDT not EST,
394 and similarly for the other Australian zones. That is, for eastern
395 standard and daylight saving time the abbreviations are AEST and AEDT
396 instead of the former EST for both; similarly, ACST/ACDT, ACWST/ACWDT,
397 and AWST/AWDT are now used instead of the former CST, CWST, and WST.
398 This change does not affect UTC offsets, only time zone abbreviations.
399 (Thanks to Rich Tibbett and many others.)
401 Asia/Novokuznetsk shifts from NOVT to KRAT (remaining on UTC+7)
402 effective 2014-10-26 at 02:00 local time.
404 The time zone abbreviation for Xinjiang Time (observed in Ürümqi)
405 has been changed from URUT to XJT. (Thanks to Luther Ma.)
407 Prefer MSK/MSD for Moscow time in Russia, even in other cities.
408 Similarly, prefer EET/EEST for eastern European time in Russia.
410 Change time zone abbreviations in (western) Samoa to use "ST" and
411 "DT" suffixes, as this is more likely to match common practice.
412 Prefix "W" to (western) Samoa time when its standard-time offset
413 disagrees with that of American Samoa.
415 America/Metlakatla now uses PST, not MeST, to abbreviate its time zone.
417 Time zone abbreviations have been updated for Japan's two time
418 zones used 1896-1937. JWST now stands for Western Standard
419 Time, and JCST for Central Standard Time (formerly this was CJT).
420 These abbreviations are now used for time in Korea, Taiwan,
421 and Sakhalin while controlled by Japan.
423 Changes affecting past time stamps
425 China's five zones have been simplified to two, since the post-1970
426 differences in the other three seem to have been imaginary. The
427 zones Asia/Harbin, Asia/Chongqing, and Asia/Kashgar have been
428 removed; backwards-compatibility links still work, albeit with
429 different behaviors for time stamps before May 1980. Asia/Urumqi's
430 1980 transition to UTC+8 has been removed, so that it is now at
431 UTC+6 and not UTC+8. (Thanks to Luther Ma and to Alois Treindl;
432 Treindl sent helpful translations of two papers by Guo Qingsheng.)
434 Some zones have been turned into links, when they differed from existing
435 zones only for older UTC offsets where data entries were likely invented.
436 These changes affect UTC offsets in pre-1970 time stamps only. This is
437 similar to the change in release 2013e, except this time for western
438 Africa. The affected zones are: Africa/Bamako, Africa/Banjul,
439 Africa/Conakry, Africa/Dakar, Africa/Freetown, Africa/Lome,
440 Africa/Nouakchott, Africa/Ouagadougou, Africa/Sao_Tome, and
441 Atlantic/St_Helena. This also affects the backwards-compatibility
442 link Africa/Timbuktu. (Thanks to Alan Barrett, Stephen Colebourne,
443 Tim Parenti, and David Patte for reporting problems in earlier
444 versions of this change.)
446 Asia/Shanghai's pre-standard-time UT offset has been changed from
447 8:05:57 to 8:05:43, the location of Xujiahui Observatory. Its
448 transition to standard time has been changed from 1928 to 1901.
450 Asia/Taipei switched to JWST on 1896-01-01, then to JST on 1937-10-01,
451 then to CST on 1945-09-21 at 01:00, and did not observe DST in 1945.
452 In 1946 it observed DST from 05-15 through 09-30; in 1947
453 from 04-15 through 10-31; and in 1979 from 07-01 through 09-30.
454 (Thanks to Yu-Cheng Chuang.)
456 Asia/Riyadh's transition to standard time is now 1947-03-14, not 1950.
458 Europe/Helsinki's 1942 fall-back transition was 10-04 at 01:00, not
459 10-03 at 00:00. (Thanks to Konstantin Hyppönen.)
461 Pacific/Pago_Pago has been changed from UTC-11:30 to UTC-11 for the period
464 Pacific/Chatham has been changed to New Zealand standard time plus
465 45 minutes for the period before 1957, reflecting a 1956 remark in
466 the New Zealand parliament.
468 Europe/Budapest has several pre-1946 corrections: in 1918 the transition
469 out of DST was on 09-16, not 09-29; in 1919 it was on 11-24, not 09-15; in
470 1945 it was on 11-01, not 11-03; in 1941 the transition to DST was 04-08
471 not 04-06 at 02:00; and there was no DST in 1920.
473 Africa/Accra is now assumed to have observed DST from 1920 through 1935.
475 Time in Russia before 1927 or so has been corrected by a few seconds in
476 the following zones: Europe/Moscow, Asia/Irkutsk, Asia/Tbilisi,
477 Asia/Tashkent, Asia/Vladivostok, Asia/Yekaterinburg, Europe/Helsinki, and
478 Europe/Riga. Also, Moscow's location has been changed to its Kilometer 0
479 point. (Thanks to Vladimir Karpinsky for the Moscow changes.)
481 Changes affecting data format
483 A new file 'zone1970.tab' supersedes 'zone.tab' in the installed data.
484 The new file's extended format allows multiple country codes per zone.
485 The older file is still installed but is deprecated; its format is
486 not changing and it will still be distributed for a while, but new
487 applications should use the new file.
489 The new file format simplifies maintenance of obscure locations.
490 To test this, it adds coverage for the Crozet Islands and the
491 Scattered Islands. (Thanks to Tobias Conradi and Antoine Leca.)
493 The file 'iso3166.tab' is planned to switch from ASCII to UTF-8.
494 It is still ASCII now, but commentary about the switch has been added.
495 The new file 'zone1970.tab' already uses UTF-8.
497 Changes affecting code
499 'localtime', 'mktime', etc. now use much less stack space if ALL_STATE
500 is defined. (Thanks to Elliott Hughes for reporting the problem.)
502 'zic' no longer mishandles input when ignoring case in locales that
503 are not compatible with English, e.g., unibyte Turkish locales when
504 compiled with HAVE_GETTEXT.
506 Error diagnostics of 'zic' and 'yearistype' have been reworded so that
507 they no longer use ASCII '-' as if it were a dash.
509 'zic' now rejects output file names that contain '.' or '..' components.
510 (Thanks to Tim Parenti for reporting the problem.)
512 'zic -v' now warns about output file names that do not follow
513 POSIX rules, or that contain a digit or '.'. (Thanks to Arthur
514 David Olson for starting the ball rolling on this.)
516 Some lint has been removed when using GCC_DEBUG_FLAGS with GCC 4.9.0.
518 Changes affecting build procedure
520 'zic' no longer links in localtime.o and asctime.o, as they're not needed.
521 (Thanks to John Cochran.)
523 Changes affecting documentation and commentary
525 The 'Theory' file documents legacy names, the longstanding
526 exceptions to the POSIX-inspired file name rules.
528 The 'zic' documentation clarifies the role of time types when
529 interpreting dates. (Thanks to Arthur David Olson.)
531 Documentation and commentary now prefer UTF-8 to US-ASCII,
532 allowing the use of proper accents in foreign words and names.
533 Code and data have not changed because of this. (Thanks to
534 Garrett Wollman, Ian Abbott, and Guy Harris for helping to debug
537 Non-HTML documentation and commentary now use plain-text URLs instead of
538 HTML insertions, and are more consistent about bracketing URLs when they
539 are not already surrounded by white space. (Thanks to suggestions by
542 There is new commentary about Xujiahui Observatory, the five time-zone
543 project in China from 1918 to 1949, timekeeping in Japanese-occupied
544 Shanghai, and Tibet Time in the 1950s. The sharp-eyed can spot the
545 warlord Jin Shuren in the data.
547 Commentary about the coverage of each Russian zone has been standardized.
548 (Thanks to Tim Parenti).
550 There is new commentary about contemporary timekeeping in Ethiopia.
552 Obsolete comments about a 2007 proposal for DST in Kuwait has been removed.
554 There is new commentary about time in Poland in 1919.
556 Proper credit has been given to DST inventor George Vernon Hudson.
558 Commentary about time in Metlakatla, AK and Resolute, NU has been
559 improved, with a new source for the former.
561 In zone.tab, Pacific/Easter no longer mentions Salas y Gómez, as it
564 Commentary about permanent Antarctic bases has been updated.
566 Several typos have been corrected. (Thanks to Tim Parenti for
567 contributing some of these fixes.)
569 tz-link.htm now mentions the JavaScript libraries Moment Timezone,
570 TimezoneJS.Date, Walltime-js, and Timezone. (Thanks to a heads-up
571 from Matt Johnson.) Also, it mentions the Go 'latlong' package.
572 (Thanks to a heads-up from Dirkjan Ochtman.)
574 The files usno1988, usno1989, usno1989a, usno1995, usno1997, and usno1998
575 have been removed. These obsolescent US Naval Observatory entries were no
576 longer helpful for maintenance. (Thanks to Tim Parenti for the suggestion.)
579 Release 2014e - 2014-06-12 21:53:52 -0700
581 Changes affecting near-future time stamps
583 Egypt's 2014 Ramadan-based transitions are June 26 and July 31 at 24:00.
584 (Thanks to Imed Chihi.) Guess that from 2015 on Egypt will temporarily
585 switch to standard time at 24:00 the last Thursday before Ramadan, and
586 back to DST at 00:00 the first Friday after Ramadan.
588 Similarly, Morocco's are June 28 at 03:00 and August 2 at 02:00. (Thanks
589 to Milamber Space Network.) Guess that from 2015 on Morocco will
590 temporarily switch to standard time at 03:00 the last Saturday before
591 Ramadan, and back to DST at 02:00 the first Saturday after Ramadan.
593 Changes affecting past time stamps
595 The abbreviation "MSM" (Moscow Midsummer Time) is now used instead of
596 "MSD" for Moscow's double daylight time in summer 1921. Also, a typo
597 "VLASST" has been repaired to be "VLAST" for Vladivostok summer time
598 in 1991. (Thanks to Hank W. for reporting the problems.)
600 Changes affecting commentary
602 tz-link.htm now cites RFC 7265 for jCal, mentions PTP and the
603 draft CalDAV extension, updates URLs for TSP, TZInfo, IATA, and
604 removes stale pointers to World Time Explorer and WORLDTIME.
607 Release 2014d - 2014-05-27 21:34:40 -0700
609 Changes affecting code
611 zic no longer generates files containing time stamps before the Big Bang.
612 This works around GNOME bug 730332
613 <https://bugzilla.gnome.org/show_bug.cgi?id=730332>.
614 (Thanks to Leonardo Chiquitto for reporting the bug, and to
615 Arthur David Olson and James Cloos for suggesting improvements to the fix.)
617 Changes affecting documentation
619 tz-link.htm now mentions GNOME.
622 Release 2014c - 2014-05-13 07:44:13 -0700
624 Changes affecting near-future time stamps
626 Egypt observes DST starting 2014-05-15 at 24:00.
627 (Thanks to Ahmad El-Dardiry and Gunther Vermier.)
628 Details have not been announced, except that DST will not be observed
629 during Ramadan. Guess that DST will stop during the same Ramadan dates as
630 Morocco, and that Egypt's future spring and fall transitions will be the
631 same as 2010 when it last observed DST, namely April's last Friday at
632 00:00 to September's last Thursday at 23:00 standard time. Also, guess
633 that Ramadan transitions will be at 00:00 standard time.
635 Changes affecting code
637 zic now generates transitions for minimum time values, eliminating guesswork
638 when handling low-valued time stamps. (Thanks to Arthur David Olson.)
640 Port to Cygwin sans glibc. (Thanks to Arthur David Olson.)
642 Changes affecting commentary and documentation
644 Remove now-confusing comment about Jordan. (Thanks to Oleksii Nochovnyi.)
647 Release 2014b - 2014-03-24 21:28:50 -0700
649 Changes affecting near-future time stamps
651 Crimea switches to Moscow time on 2014-03-30 at 02:00 local time.
652 (Thanks to Alexander Krivenyshev.) Move its zone.tab entry from UA to RU.
654 New entry for Troll station, Antarctica. (Thanks to Paul-Inge Flakstad and
655 Bengt-Inge Larsson.) This is currently an approximation; a better version
656 will require the zic and localtime fixes mentioned below, and the plan is
657 to wait for a while until at least the zic fixes propagate.
659 Changes affecting code
661 'zic' and 'localtime' no longer reject locations needing four transitions
662 per year for the foreseeable future. (Thanks to Andrew Main (Zefram).)
663 Also, 'zic' avoids some unlikely failures due to integer overflow.
665 Changes affecting build procedure
667 'make check' now detects Rule lines defined but never used.
668 The NZAQ rules, an instance of this problem, have been removed.
670 Changes affecting commentary and documentation
672 Fix Tuesday/Thursday typo in description of time in Israel.
673 (Thanks to Bert Katz via Pavel Kharitonov and Mike Frysinger.)
675 Microsoft Windows 8.1 doesn't support tz database names. (Thanks
676 to Donald MacQueen.) Instead, the Microsoft Windows Store app
677 library supports them.
679 Add comments about Johnston Island time in the 1960s.
680 (Thanks to Lyle McElhaney.)
682 Morocco's 2014 DST start will be as predicted.
683 (Thanks to Sebastien Willemijns.)
686 Release 2014a - 2014-03-07 23:30:29 -0800
688 Changes affecting near-future time stamps
690 Turkey begins DST on 2014-03-31, not 03-30. (Thanks to Faruk Pasin for
691 the heads-up, and to Tim Parenti for simplifying the update.)
693 Changes affecting past time stamps
695 Fiji ended DST on 2014-01-19 at 02:00, not the previously-scheduled 03:00.
696 (Thanks to Steffen Thorsen.)
698 Ukraine switched from Moscow to Eastern European time on 1990-07-01
699 (not 1992-01-01), and observed DST during the entire next winter.
700 (Thanks to Vladimir in Moscow via Alois Treindl.)
702 In 1988 Israel observed DST from 04-10 to 09-04, not 04-09 to 09-03.
703 (Thanks to Avigdor Finkelstein.)
705 Changes affecting code
707 A uninitialized-storage bug in 'localtime' has been fixed.
708 (Thanks to Logan Chien.)
710 Changes affecting the build procedure
712 The settings for 'make check_web' now default to Ubuntu 13.10.
714 Changes affecting commentary and documentation
716 The boundary of the US Pacific time zone is given more accurately.
717 (Thanks to Alan Mintz.)
719 Chile's 2014 DST will be as predicted. (Thanks to José Miguel Garrido.)
721 Paraguay's 2014 DST will be as predicted. (Thanks to Carlos Raúl Perasso.)
723 Better descriptions of countries with same time zone history as
724 Trinidad and Tobago since 1970. (Thanks to Alan Barrett for suggestion.)
726 Several changes affect tz-link.htm, the main web page.
728 Mention Time.is (thanks to Even Scharning) and WX-now (thanks to
731 Mention xCal (Internet RFC 6321) and jCal.
733 Microsoft has some support for tz database names.
735 CLDR data formats include both XML and JSON.
737 Mention Maggiolo's map of solar vs standard time.
738 (Thanks to Arthur David Olson.)
740 Mention TZ4Net. (Thanks to Matt Johnson.)
742 Mention the timezone-olson Haskell package.
744 Mention zeitverschiebung.net. (Thanks to Martin Jäger.)
746 Remove moribund links to daylight-savings-time.info and to
747 Simple Timer + Clocks.
749 Update two links. (Thanks to Oscar van Vlijmen.)
751 Fix some formatting glitches, e.g., remove random newlines from
752 abbr elements' title attributes.
755 Release 2013i - 2013-12-17 07:25:23 -0800
757 Changes affecting near-future time stamps:
759 Jordan switches back to standard time at 00:00 on December 20, 2013.
760 The 2006-2011 transition schedule is planned to resume in 2014.
761 (Thanks to Steffen Thorsen.)
763 Changes affecting past time stamps:
765 In 2004, Cuba began DST on March 28, not April 4.
766 (Thanks to Steffen Thorsen.)
768 Changes affecting code
770 The compile-time flag NOSOLAR has been removed, as nowadays the
771 benefit of slightly shrinking runtime table size is outweighed by the
772 cost of disallowing potential future updates that exceed old limits.
774 Changes affecting documentation and commentary
776 The files solar87, solar88, and solar89 are no longer distributed.
777 They were a negative experiment - that is, a demonstration that
778 tz data can represent solar time only with some difficulty and error.
779 Their presence in the distribution caused confusion, as Riyadh
780 civil time was generally not solar time in those years.
782 tz-link.htm now mentions Noda Time. (Thanks to Matt Johnson.)
785 Release 2013h - 2013-10-25 15:32:32 -0700
787 Changes affecting current and future time stamps:
789 Libya has switched its time zone back to UTC+2 without DST,
790 instead of UTC+1 with DST. (Thanks to Even Scharning.)
792 Western Sahara (Africa/El_Aaiun) uses Morocco's DST rules.
793 (Thanks to Gwillim Law.)
795 Changes affecting future time stamps:
797 Acre and (we guess) western Amazonas will switch from UTC-4 to UTC-5
798 on 2013-11-10. This affects America/Rio_Branco and America/Eirunepe.
799 (Thanks to Steffen Thorsen.)
801 Add entries for DST transitions in Morocco in the year 2038.
802 This avoids some year-2038 glitches introduced in 2013g.
803 (Thanks to Yoshito Umaoka for reporting the problem.)
805 Changes affecting API
807 The 'tzselect' command no longer requires the 'select' command,
808 and should now work with /bin/sh on more platforms. It also works
809 around a bug in BusyBox awk before version 1.21.0. (Thanks to
810 Patrick 'P. J.' McDermott and Alan Barrett.)
812 Changes affecting code
814 Fix localtime overflow bugs with 32-bit unsigned time_t.
816 zdump no longer assumes sscanf returns maximal values on overflow.
818 Changes affecting the build procedure
820 The builder can specify which programs to use, if any, instead of
821 'ar' and 'ranlib', and libtz.a is now built locally before being
822 installed. (Thanks to Michael Forney.)
824 A dependency typo in the 'zdump' rule has been fixed.
825 (Thanks to Andrew Paprocki.)
827 The Makefile has been simplified by assuming that 'mkdir -p' and 'cp -f'
828 work as specified by POSIX.2-1992 or later; this is portable nowadays.
830 'make clean' no longer removes 'leapseconds', since it's
831 host-independent and is part of the distribution.
833 The unused makefile macros TZCSRCS, TZDSRCS, DATESRCS have been removed.
835 Changes affecting documentation and commentary
837 tz-link.htm now mentions TC TIMEZONE's draft time zone service protocol
838 (thanks to Mike Douglass) and TimezoneJS.Date (thanks to Jim Fehrle).
840 Update URLs in tz-link page. Add URLs for Microsoft Windows, since
841 8.1 introduces tz support. Remove URLs for Tru64 and UnixWare (no
842 longer maintained) and for old advisories. SOFA now does C.
844 Release 2013g - 2013-09-30 21:08:26 -0700
846 Changes affecting current and near-future time stamps
848 Morocco now observes DST from the last Sunday in March to the last
849 Sunday in October, not April to September respectively. (Thanks
852 Changes affecting 'zic'
854 'zic' now runs on platforms that lack both hard links and symlinks.
855 (Thanks to Theo Veenker for reporting the problem, for MinGW.)
856 Also, fix some bugs on platforms that lack hard links but have symlinks.
858 'zic -v' again warns that Asia/Tehran has no POSIX environment variable
859 to predict the far future, fixing a bug introduced in 2013e.
861 Changes affecting the build procedure
863 The 'leapseconds' file is again put into the tzdata tarball.
864 Also, 'leapseconds.awk', so tzdata is self-contained. (Thanks to
865 Matt Burgess and Ian Abbott.) The timestamps of these and other
866 dependent files in tarballs are adjusted more consistently.
868 Changes affecting documentation and commentary
870 The README file is now part of the data tarball as well as the code.
871 It now states that files are public domain unless otherwise specified.
872 (Thanks to Andrew Main (Zefram) for asking for clarifications.)
873 Its details about the 1989 release moved to a place of honor near
877 Release 2013f - 2013-09-24 23:37:36 -0700
879 Changes affecting near-future time stamps
881 Tocantins will very likely not observe DST starting this spring.
882 (Thanks to Steffen Thorsen.)
884 Jordan will likely stay at UTC+3 indefinitely, and will not fall
887 Palestine will fall back at 00:00, not 01:00. (Thanks to Steffen Thorsen.)
889 Changes affecting API
891 The types of the global variables 'timezone' and 'altzone' (if present)
892 have been changed back to 'long'. This is required for 'timezone'
893 by POSIX, and for 'altzone' by common practice, e.g., Solaris 11.
894 These variables were originally 'long' in the tz code, but were
895 mistakenly changed to 'time_t' in 1987; nobody reported the
896 incompatibility until now. The difference matters on x32, where
897 'long' is 32 bits and 'time_t' is 64. (Thanks to Elliott Hughes.)
899 Changes affecting the build procedure
901 Avoid long strings in leapseconds.awk to work around a mawk bug.
902 (Thanks to Cyril Baurand.)
904 Changes affecting documentation and commentary
906 New file 'NEWS' that contains release notes like this one.
908 Paraguay's law does not specify DST transition time; 00:00 is customary.
909 (Thanks to Waldemar Villamayor-Venialbo.)
911 Minor capitalization fixes.
913 Changes affecting version-control only
915 The experimental GitHub repository now contains annotated and
916 signed tags for recent releases, e.g., '2013e' for Release 2013e.
917 Releases are tagged starting with 2012e; earlier releases were
918 done differently, and tags would either not have a simple name or
919 not exactly match what was released.
921 'make set-timestamps' is now simpler and a bit more portable.
924 Release 2013e - 2013-09-19 23:50:04 -0700
926 Changes affecting near-future time stamps
928 This year Fiji will start DST on October 27, not October 20.
929 (Thanks to David Wheeler for the heads-up.) For now, guess that
930 Fiji will continue to spring forward the Sunday before the fourth
933 Changes affecting current and future time zone abbreviations
935 Use WIB/WITA/WIT rather than WIT/CIT/EIT for alphabetic Indonesian
936 time zone abbreviations since 1932. (Thanks to George Ziegler,
937 Priyadi Iman Nurcahyo, Zakaria, Jason Grimes, Martin Pitt, and
938 Benny Lin.) This affects Asia/Dili, Asia/Jakarta, Asia/Jayapura,
939 Asia/Makassar, and Asia/Pontianak.
941 Use ART (UTC-3, standard time), rather than WARST (also UTC-3, but
942 daylight saving time) for San Luis, Argentina since 2009.
944 Changes affecting Godthåb time stamps after 2037 if version mismatch
946 Allow POSIX-like TZ strings where the transition time's hour can
947 range from -167 through 167, instead of the POSIX-required 0
948 through 24. E.g., TZ='FJT-12FJST,M10.3.1/146,M1.3.4/75' for the
949 new Fiji rules. This is a more-compact way to represent
950 far-future time stamps for America/Godthab, America/Santiago,
951 Antarctica/Palmer, Asia/Gaza, Asia/Hebron, Asia/Jerusalem,
952 Pacific/Easter, and Pacific/Fiji. Other zones are unaffected by
953 this change. (Derived from a suggestion by Arthur David Olson.)
955 Allow POSIX-like TZ strings where daylight saving time is in
956 effect all year. E.g., TZ='WART4WARST,J1/0,J365/25' for Western
957 Argentina Summer Time all year. This supports a more-compact way
958 to represent the 2013d data for America/Argentina/San_Luis.
959 Because of the change for San Luis noted above this change does not
960 affect the current data. (Thanks to Andrew Main (Zefram) for
961 suggestions that improved this change.)
963 Where these two TZ changes take effect, there is a minor extension
964 to the tz file format in that it allows new values for the
965 embedded TZ-format string, and the tz file format version number
966 has therefore been increased from 2 to 3 as a precaution.
967 Version-2-based client code should continue to work as before for
968 all time stamps before 2038. Existing version-2-based client code
969 (tzcode, GNU/Linux, Solaris) has been tested on version-3-format
970 files, and typically works in practice even for time stamps after
971 2037; the only known exception is America/Godthab.
973 Changes affecting time stamps before 1970
975 Pacific/Johnston is now a link to Pacific/Honolulu. This corrects
976 some errors before 1947.
978 Some zones have been turned into links, when they differ from existing
979 zones only in older data entries that were likely invented or that
980 differ only in LMT or transitions from LMT. These changes affect
981 only time stamps before 1943. The affected zones are:
982 Africa/Juba, America/Anguilla, America/Aruba, America/Dominica,
983 America/Grenada, America/Guadeloupe, America/Marigot,
984 America/Montserrat, America/St_Barthelemy, America/St_Kitts,
985 America/St_Lucia, America/St_Thomas, America/St_Vincent,
986 America/Tortola, and Europe/Vaduz. (Thanks to Alois Treindl for
987 confirming that the old Europe/Vaduz zone was wrong and the new
988 link is better for WWII-era times.)
990 Change Kingston Mean Time from -5:07:12 to -5:07:11. This affects
991 America/Cayman, America/Jamaica and America/Grand_Turk time stamps
994 Change the UT offset of Bern Mean Time from 0:29:44 to 0:29:46.
995 This affects Europe/Zurich time stamps from 1853 to 1894. (Thanks
998 Change the date of the circa-1850 Zurich transition from 1849-09-12
999 to 1853-07-16, overriding Shanks with data from Messerli about
1000 postal and telegraph time in Switzerland.
1002 Changes affecting time zone abbreviations before 1970
1004 For Asia/Jakarta, use BMT (not JMT) for mean time from 1923 to 1932,
1005 as Jakarta was called Batavia back then.
1007 Changes affecting API
1009 The 'zic' command now outputs a dummy transition when far-future
1010 data can't be summarized using a TZ string, and uses a 402-year
1011 window rather than a 400-year window. For the current data, this
1012 affects only the Asia/Tehran file. It does not affect any of the
1013 time stamps that this file represents, so zdump outputs the same
1014 information as before. (Thanks to Andrew Main (Zefram).)
1016 The 'date' command has a new '-r' option, which lets you specify
1017 the integer time to display, a la FreeBSD.
1019 The 'tzselect' command has two new options '-c' and '-n', which lets you
1020 select a zone based on latitude and longitude.
1022 The 'zic' command's '-v' option now warns about constructs that
1023 require the new version-3 binary file format. (Thanks to Arthur
1024 David Olson for the suggestion.)
1026 Support for floating-point time_t has been removed.
1027 It was always dicey, and POSIX no longer requires it.
1028 (Thanks to Eric Blake for suggesting to the POSIX committee to
1029 remove it, and thanks to Alan Barrett, Clive D.W. Feather, Andy
1030 Heninger, Arthur David Olson, and Alois Treindl, for reporting
1031 bugs and elucidating some of the corners of the old floating-point
1034 The signatures of 'offtime', 'timeoff', and 'gtime' have been
1035 changed back to the old practice of using 'long' to represent UT
1036 offsets. This had been inadvertently and mistakenly changed to
1037 'int_fast32_t'. (Thanks to Christos Zoulas.)
1039 The code avoids undefined behavior on integer overflow in some
1040 more places, including gmtime, localtime, mktime and zdump.
1042 Changes affecting the zdump utility
1044 zdump now outputs "UT" when referring to Universal Time, not "UTC".
1045 "UTC" does not make sense for time stamps that predate the introduction
1046 of UTC, whereas "UT", a more-generic term, does. (Thanks to Steve Allen
1047 for clarifying UT vs UTC.)
1049 Data changes affecting behavior of tzselect and similar programs
1051 Country code BQ is now called the more-common name "Caribbean Netherlands"
1052 rather than the more-official "Bonaire, St Eustatius & Saba".
1054 Remove from zone.tab the names America/Montreal, America/Shiprock,
1055 and Antarctica/South_Pole, as they are equivalent to existing
1056 same-country-code zones for post-1970 time stamps. The data entries for
1057 these names are unchanged, so the names continue to work as before.
1059 Changes affecting code internals
1061 zic -c now runs way faster on 64-bit hosts when given large numbers.
1063 zic now uses vfprintf to avoid allocating and freeing some memory.
1065 tzselect now computes the list of continents from the data,
1066 rather than have it hard-coded.
1068 Minor changes pacify GCC 4.7.3 and GCC 4.8.1.
1070 Changes affecting the build procedure
1072 The 'leapseconds' file is now generated automatically from a
1073 new file 'leap-seconds.list', which is a copy of
1074 <ftp://time.nist.gov/pub/leap-seconds.list>.
1075 A new source file 'leapseconds.awk' implements this.
1076 The goal is simplification of the future maintenance of 'leapseconds'.
1078 When building the 'posix' or 'right' subdirectories, if the
1079 subdirectory would be a copy of the default subdirectory, it is
1080 now made a symbolic link if that is supported. This saves about
1081 2 MB of file system space.
1083 The links America/Shiprock and Antarctica/South_Pole have been
1084 moved to the 'backward' file. This affects only nondefault builds
1085 that omit 'backward'.
1087 Changes affecting version-control only
1089 .gitignore now ignores 'date'.
1091 Changes affecting documentation and commentary
1093 Changes to the 'tzfile' man page
1095 It now mentions that the binary file format may be extended in
1096 future versions by appending data.
1098 It now refers to the 'zdump' and 'zic' man pages.
1100 Changes to the 'zic' man page
1102 It lists conditions that elicit a warning with '-v'.
1104 It says that the behavior is unspecified when duplicate names
1105 are given, or if the source of one link is the target of another.
1107 Its examples are updated to match the latest data.
1109 The definition of white space has been clarified slightly.
1110 (Thanks to Michael Deckers.)
1112 Changes to the 'Theory' file
1114 There is a new section about the accuracy of the tz database,
1115 describing the many ways that errors can creep in, and
1116 explaining why so many of the pre-1970 time stamps are wrong or
1117 misleading (thanks to Steve Allen, Lester Caine, and Garrett
1118 Wollman for discussions that contributed to this).
1120 The 'Theory' file describes LMT better (this follows a
1121 suggestion by Guy Harris).
1123 It refers to the 2013 edition of POSIX rather than the 2004 edition.
1125 It's mentioned that excluding 'backward' should not affect the
1126 other data, and it suggests at least one zone.tab name per
1127 inhabited country (thanks to Stephen Colebourne).
1129 Some longstanding restrictions on names are documented, e.g.,
1130 'America/New_York' precludes 'America/New_York/Bronx'.
1132 It gives more reasons for the 1970 cutoff.
1134 It now mentions which time_t variants are supported, such as
1135 signed integer time_t. (Thanks to Paul Goyette for reporting
1136 typos in an experimental version of this change.)
1138 (Thanks to Philip Newton for correcting typos in these changes.)
1140 Documentation and commentary is more careful to distinguish UT in
1141 general from UTC in particular. (Thanks to Steve Allen.)
1143 Add a better source for the Zurich 1894 transition.
1144 (Thanks to Pierre-Yves Berger.)
1146 Update shapefile citations in tz-link.htm. (Thanks to Guy Harris.)
1149 Release 2013d - 2013-07-05 07:38:01 -0700
1151 Changes affecting future time stamps:
1153 Morocco's midsummer transitions this year are July 7 and August 10,
1154 not July 9 and August 8. (Thanks to Andrew Paprocki.)
1156 Israel now falls back on the last Sunday of October.
1157 (Thanks to Ephraim Silverberg.)
1159 Changes affecting past time stamps:
1161 Specify Jerusalem's location more precisely; this changes the pre-1880
1164 Changing affecting metadata only:
1166 Fix typos in the entries for country codes BQ and SX.
1168 Changes affecting code:
1170 Rework the code to fix a bug with handling Australia/Macquarie on
1171 32-bit hosts (thanks to Arthur David Olson).
1173 Port to platforms like NetBSD, where time_t can be wider than long.
1175 Add support for testing time_t types other than the system's.
1176 Run 'make check_time_t_alternatives' to try this out.
1177 Currently, the tests fail for unsigned time_t;
1178 this should get fixed at some point.
1180 Changes affecting documentation and commentary:
1182 Deemphasize the significance of national borders.
1184 Update the zdump man page.
1186 Remove obsolete NOID comment (thanks to Denis Excoffier).
1188 Update several URLs and comments in the web pages.
1190 Spelling fixes (thanks to Kevin Lyda and Jonathan Leffler).
1192 Update URL for CLDR Zone->Tzid table (thanks to Yoshito Umaoka).
1195 Release 2013c - 2013-04-19 16:17:40 -0700
1197 Changes affecting current and future time stamps:
1199 Palestine observed DST starting March 29, 2013. (Thanks to
1200 Steffen Thorsen.) From 2013 on, Gaza and Hebron both observe DST,
1201 with the predicted rules being the last Thursday in March at 24:00
1202 to the first Friday on or after September 21 at 01:00.
1204 Assume that the recent change to Paraguay's DST rules is permanent,
1205 by moving the end of DST to the 4th Sunday in March every year.
1206 (Thanks to Carlos Raúl Perasso.)
1208 Changes affecting past time stamps:
1210 Fix some historical data for Palestine to agree with that of
1211 timeanddate.com, as follows:
1213 The spring 2008 change in Gaza and Hebron was on 00:00 Mar 28, not
1216 The fall 2009 change in Gaza and Hebron on Sep 4 was at 01:00, not
1219 The spring 2010 change in Hebron was 00:00 Mar 26, not 00:01 Mar 27.
1221 The spring 2011 change in Gaza was 00:01 Apr 1, not 12:01 Apr 2.
1223 The spring 2011 change in Hebron on Apr 1 was at 00:01, not 12:01.
1225 The fall 2011 change in Hebron on Sep 30 was at 00:00, not 03:00.
1227 Fix times of habitation for Macquarie to agree with the Tasmania
1228 Parks & Wildlife Service history, which indicates that permanent
1229 habitation was 1899-1919 and 1948 on.
1231 Changing affecting metadata only:
1233 Macquarie Island is politically part of Australia, not Antarctica.
1234 (Thanks to Tobias Conradi.)
1236 Sort Macquarie more-consistently with other parts of Australia.
1237 (Thanks to Tim Parenti.)
1240 Release 2013b - 2013-03-10 22:33:40 -0700
1242 Changes affecting current and future time stamps:
1244 Haiti uses US daylight-saving rules this year, and presumably future years.
1245 This changes time stamps starting today. (Thanks to Steffen Thorsen.)
1247 Paraguay will end DST on March 24 this year.
1248 (Thanks to Steffen Thorsen.) For now, assume it's just this year.
1250 Morocco does not observe DST during Ramadan;
1251 try to predict Ramadan in Morocco as best we can.
1252 (Thanks to Erik Homoet for the heads-up.)
1254 Changes affecting commentary:
1256 Update URLs in tz-link page. Add URLs for webOS, BB10, iOS.
1257 Update URL for Solaris. Mention Internet RFC 6557.
1258 Update Internet RFCs 2445->5545, 2822->5322.
1259 Switch from FTP to HTTP for Internet RFCs.
1262 Release 2013a - 2013-02-27 09:20:35 -0800
1264 Change affecting binary data format:
1266 The zone offset at the end of version-2-format zone files is now
1267 allowed to be 24:00, as per POSIX.1-2008. (Thanks to Arthur David Olson.)
1269 Changes affecting current and future time stamps:
1271 Chile's 2013 rules, and we guess rules for 2014 and later, will be
1272 the same as 2012, namely Apr Sun>=23 03:00 UTC to Sep Sun>=2 04:00 UTC.
1273 (Thanks to Steffen Thorsen and Robert Elz.)
1275 New Zones Asia/Khandyga, Asia/Ust-Nera, Europe/Busingen.
1276 (Thanks to Tobias Conradi and Arthur David Olson.)
1278 Many changes affect historical time stamps before 1940.
1279 These were deduced from: Milne J. Civil time. Geogr J. 1899
1280 Feb;13(2):173-94 <http://www.jstor.org/stable/1774359>.
1282 Changes affecting the code:
1284 Fix zic bug that mishandled Egypt's 2010 changes (this also affected
1285 the data). (Thanks to Arthur David Olson.)
1287 Fix localtime bug when time_t is unsigned and data files were generated
1288 by a signed time_t system. (Thanks to Doug Bailey for reporting and
1289 to Arthur David Olson for fixing.)
1291 Allow the email address for bug reports to be set by the packager.
1292 The default is tz@iana.org, as before. (Thanks to Joseph S. Myers.)
1294 Update HTML checking to be compatible with Ubuntu 12.10.
1296 Check that files are a safe subset of ASCII. At some point we may
1297 relax this requirement to a safe subset of UTF-8. Without the
1298 check, some non-UTF-8 encodings were leaking into the distribution.
1302 Restore a comment about copyright notices that was inadvertently deleted.
1303 (Thanks to Arthur David Olson.)
1305 Improve the commentary about which districts observe what times
1306 in Russia. (Thanks to Oscar van Vlijmen and Arthur David Olson).
1308 Add web page links to tz.js.
1310 Add "Run by the Monkeys" to tz-art. (Thanks to Arthur David Olson.)
1313 Release 2012j - 2012-11-12 18:34:49 -0800
1315 Libya moved to CET this weekend, but with DST planned next year.
1316 (Thanks to Even Scharning, Steffen Thorsen, and Tim Parenti.)
1318 Signatures now have the extension .asc, not .sign, as that's more
1319 standard. (Thanks to Phil Pennock.)
1321 The output of 'zdump --version', and of 'zic --version', now
1322 uses a format that is more typical for --version.
1323 (Thanks to Joseph S. Myers.)
1325 The output of 'tzselect --help', 'zdump --help', and 'zic --help'
1326 now uses tz@iana.org rather than the old elsie address.
1328 zic -v now complains about abbreviations that are less than 3
1329 or more than 6 characters, as per Posix. Formerly, it checked
1330 for abbreviations that were more than 3.
1332 'make public' no longer puts its temporary directory under /tmp,
1333 and uses the just-built zic rather than the system zic.
1335 Various fixes to documentation and commentary.
1338 Release 2012i - 2012-11-03 12:57:09 -0700
1340 Cuba switches from DST tomorrow at 01:00. (Thanks to Steffen Thorsen.)
1342 Linker flags can now be specified via LDFLAGS.
1343 AWK now defaults to 'awk', not 'nawk'.
1344 The shell in tzselect now defaults to /bin/bash, but this can
1345 be overridden by specifying KSHELL.
1346 The main web page now mentions the unofficial GitHub repository.
1347 (Thanks to Mike Frysinger.)
1349 Tarball signatures can now be built by running 'make signatures'.
1350 There are also new makefile rules 'tarballs', 'check_public', and
1351 separate makefile rules for each tarball and signature file.
1352 A few makefile rules are now more portable to strict POSIX.
1354 The main web page now lists the canonical IANA URL.
1357 Release 2012h - 2012-10-26 22:49:10 -0700
1359 Bahia no longer has DST. (Thanks to Kelley Cook.)
1361 Tocantins has DST. (Thanks to Rodrigo Severo.)
1363 Israel has new DST rules next year. (Thanks to Ephraim Silverberg.)
1365 Jordan stays on DST this winter. (Thanks to Steffen Thorsen.)
1369 More C modernization, except that at Arthur David Olson's suggestion
1370 the instances of 'register' were kept.
1373 Release 2012g - 2012-10-17 20:59:45 -0700
1375 Samoa fall 2012 and later. (Thanks to Nicholas Pereira and Robert Elz.)
1377 Palestine fall 2012. (Thanks to Steffen Thorsen.)
1381 To attack the version-number problem, this release ships the file
1382 'Makefile' (which contains the release number) in both the tzcode and
1383 the tzdata tarballs. The two Makefiles are identical, and should be
1384 identical in any matching pair of tarballs, so it shouldn't matter
1385 which order you extract the tarballs. Perhaps we can come up with a
1386 better version-number scheme at some point; this scheme does have the
1387 virtue of not adding more files.
1390 Release 2012f - 2012-09-12 23:17:03 -0700
1392 * australasia (Pacific/Fiji): Fiji DST is October 21 through January
1393 20 this year. (Thanks to Steffen Thorsen.)
1396 Release 2012e - 2012-08-02 20:44:55 -0700
1398 * australasia (Pacific/Fakaofo): Tokelau is UTC+13, not UTC+14.
1399 (Thanks to Steffen Thorsen.)
1401 * Use a single version number for both code and data.
1403 * .gitignore: New file.
1405 * Remove trailing white space.
1408 Release code2012c-data2012d - 2012-07-19 16:35:33 -0700
1410 Changes for Morocco's time stamps, which take effect in a couple of
1411 hours, along with infrastructure changes to accommodate how the tz
1412 code and data are released on IANA.
1415 Release data2012c - 2012-03-27 12:17:25 -0400
1418 Summer time changes for Morocco (to start late April 2012)
1421 Changes for 2012 for Gaza & the West Bank (Hebron) and Syria
1424 Haiti following US/Canada rules for 2012 (and we're assuming,
1425 for now anyway, for the future).
1428 Release 2012b - 2012-03-02 12:29:15 +0700
1430 There is just one change to tzcode2012b (compared with 2012a):
1431 the Makefile that was accidentally included with 2012a has been
1432 replaced with the version that should have been there, which is
1433 identical with the previous version (from tzcode2011i).
1435 There are just two changes in tzdata2012b compared with 2012a.
1437 Most significantly, summer time in Cuba has been delayed 3 weeks
1438 (now starts April 1 rather than March 11). Since Mar 11 (the old start
1439 date, as listed in 2012a) is just a little over a week away, this
1442 Less importantly, an excess tab in one of the changes in zone.tab
1443 in 2012a has been removed.
1446 Release 2012a - 2012-03-01 18:28:10 +0700
1448 The changes in tzcode2012a (compared to the previous version, 2011i)
1449 are entirely to the README and tz-art.htm and tz-link.htm files, if
1450 none of those concern you, you can ignore the code update. The changes
1451 reflect the changed addresses for the mailing list and the code and
1452 data distribution points & methods (and a link to DateTime::TimeZone::Tzfile
1453 has been added to tz-link.htm).
1455 In tzdata2012a (compared to the previous release, which was 2011n)
1456 the major changes are:
1457 Chile 2011/2012 and 2012/2013 summer time date adjustments.
1458 Falkland Islands onto permanent summer time (we're assuming for the
1459 foreseeable future, though 2012 is all we're fairly certain of.)
1460 Armenia has abolished Summer Time.
1461 Tokelau jumped the International Date Line back last December
1462 (just the same as their near neighbour, Samoa).
1463 America/Creston is a new zone for a small area of British Columbia
1464 There will be a leapsecond 2012-06-30 23:59:60 UTC.
1466 Other minor changes are:
1467 Corrections to 1918 Canadian summer time end dates.
1468 Updated URL for UK time zone history (in comments)
1469 A few typos in Le Corre's list of free French place names (comments)
1472 Release data2011n - 2011-10-30 14:57:54 +0700
1474 There are three changes of note - most urgently, Cuba (America/Havana)
1475 has extended summer time by two weeks, now to end on Nov 13, rather than
1476 the (already past) Oct 30. Second, the Pridnestrovian Moldavian Republic
1477 (Europe/Tiraspol) decided not to split from the rest of Moldova after
1478 all, and consequently that zone has been removed (again) and reinstated
1479 in the "backward" file as a link to Europe/Chisinau. And third, the
1480 end date for Fiji's summer time this summer was moved forward from the
1481 earlier planned Feb 26, to Jan 22.
1483 Apart from that, Moldova (MD) returns to a single entry in zone.tab
1484 (and the incorrect syntax that was in the 2011m version of that file
1485 is so fixed - it would have been fixed in a different way had this
1486 change not happened - that's the "missing" sccs version id).
1489 Release data2011m - 2011-10-24 21:42:16 +0700
1491 In particular, the typos in comments in the data (2011-11-17 should have
1492 been 2011-10-17 as Alan Barrett noted, and spelling of Tiraspol that
1493 Tim Parenti noted) have been fixed, and the change for Ukraine has been
1494 made in all 4 Ukrainian zones, rather than just Kiev (again, thanks to
1495 Tim Parenti, and also Denys Gavrysh)
1497 In addition, I added Europe/Tiraspol to zone.tab.
1499 This time, all the files have new version numbers... (including the files
1500 otherwise unchanged in 2011m that were changed in 2011l but didn't get new
1501 version numbers there...)
1504 Release data2011l - 2011-10-10 11:15:43 +0700
1506 There are just 2 changes that cause different generated tzdata files from
1507 zic, to Asia/Hebron and Pacific/Fiji - the possible change for Bahia, Brazil
1508 is included, but commented out. Compared with the diff I sent out last week,
1509 this version also includes attributions for the sources for the changes
1510 (in much the same format as ado used, but the html tags have not been
1511 checked, verified, or used in any way at all, so if there are errors there,
1512 please let me know.)
1515 Release data2011k - 2011-09-20 17:54:03 -0400
1520 Release data2011j - 2011-09-12 09:22:49 -0400
1522 (contemporary changes for Samoa; past changes for Kenya, Uganda, and
1523 Tanzania); there are also two spelling corrections to comments in
1524 the australasia file (with thanks to Christos Zoulas).
1527 Release 2011i - 2011-08-29 05:56:32 -0400
1532 Release data2011h - 2011-06-15 18:41:48 -0400
1534 Russia and Curaçao changes
1537 Release 2011g - 2011-04-25 09:07:22 -0400
1539 update the rules for Egypt to reflect its abandonment of DST this year
1542 Release 2011f - 2011-04-06 17:14:53 -0400
1547 Release 2011e - 2011-03-31 16:04:38 -0400
1549 Morocco, Chile, and tz-link changes
1552 Release 2011d - 2011-03-14 09:18:01 -0400
1554 changes that impact present-day time stamps in Cuba, Samoa, and Turkey
1557 Release 2011c - 2011-03-07 09:30:09 -0500
1559 These do affect current time stamps in Chile and Annette Island, Canada.
1562 Release 2011b - 2011-02-07 08:44:50 -0500
1567 Release 2011a - 2011-01-24 10:30:16 -0500
1572 Release data2010o - 2010-11-01 09:18:23 -0400
1574 change to the end of DST in Fiji in 2011
1577 Release 2010n - 2010-10-25 08:19:17 -0400
1582 Release 2010m - 2010-09-27 09:24:48 -0400
1584 Hong Kong, Vostok, and zic.c changes
1587 Release 2010l - 2010-08-16 06:57:25 -0400
1592 Release 2010k - 2010-07-26 10:42:27 -0400
1597 Release 2010j - 2010-05-10 09:07:48 -0400
1599 changes for Bahía de Banderas and for version naming
1602 Release data2010i - 2010-04-16 18:50:45 -0400
1604 the end of DST in Morocco on 2010-08-08
1607 Release data2010h - 2010-04-05 09:58:56 -0400
1612 Release data2010g - 2010-03-24 11:14:53 -0400
1617 Release 2010f - 2010-03-22 09:45:46 -0400
1622 Release data2010e - 2010-03-08 14:24:27 -0500
1624 corrects the Dhaka bug found by Danvin Ruangchan
1627 Release data2010d - 2010-03-06 07:26:01 -0500
1632 Release 2010c - 2010-03-01 09:20:58 -0500
1634 changes including KRE's suggestion for earlier initialization of
1635 "goahead" and "goback" structure elements
1638 Release code2010a - 2010-02-16 10:40:04 -0500
1643 Release data2010b - 2010-01-20 12:37:01 -0500
1648 Release data2010a - 2010-01-18 08:30:04 -0500
1653 Release data2009u - 2009-12-26 08:32:28 -0500
1655 changes to DST in Bangladesh
1658 Release 2009t - 2009-12-21 13:24:27 -0500
1663 Release data2009s - 2009-11-14 10:26:32 -0500
1665 (cosmetic) Antarctica change and the DST-in-Fiji-in-2009-and-2010 change
1668 Release 2009r - 2009-11-09 10:10:31 -0500
1670 "antarctica" and "tz-link.htm" changes
1673 Release 2009q - 2009-11-02 09:12:40 -0500
1675 with two corrections as reported by Eric Muller and Philip Newton
1678 Release data2009p - 2009-10-23 15:05:27 -0400
1680 Argentina (including San Luis) changes (with the correction from
1684 Release data2009o - 2009-10-14 16:49:38 -0400
1686 Samoa (commentary only), Pakistan, and Bangladesh changes
1689 Release data2009n - 2009-09-22 15:13:38 -0400
1691 added commentary for Argentina and a change to the end of DST in
1695 Release data2009m - 2009-09-03 10:23:43 -0400
1697 Samoa and Palestine changes
1700 Release data2009l - 2009-08-14 09:13:07 -0400
1702 Samoa (comments only) and Egypt
1705 Release 2009k - 2009-07-20 09:46:08 -0400
1710 Release data2009j - 2009-06-15 06:43:59 -0400
1712 Bangladesh change (with a short turnaround since the DST change is
1716 Release 2009i - 2009-06-08 09:21:22 -0400
1718 updating for DST in Bangladesh this year
1721 Release 2009h - 2009-05-26 09:19:14 -0400
1726 Release data2009g - 2009-04-20 16:34:07 -0400
1731 Release data2009f - 2009-04-10 11:00:52 -0400
1733 correct DST in Pakistan
1736 Release 2009e - 2009-04-06 09:08:11 -0400
1741 Release 2009d - 2009-03-23 09:38:12 -0400
1743 Morocco, Tunisia, Argentina, and American Astronomical Society changes
1746 Release data2009c - 2009-03-16 09:47:51 -0400
1748 change to the start of Cuban DST
1751 Release 2009b - 2009-02-09 11:15:22 -0500
1756 Release 2009a - 2009-01-21 10:09:39 -0500
1761 Release data2008i - 2008-10-21 12:10:25 -0400
1763 southamerica and zone.tab files, with Argentina DST rule changes and
1764 United States zone reordering and recommenting
1767 Release 2008h - 2008-10-13 07:33:56 -0400
1772 Release 2008g - 2008-10-06 09:03:18 -0400
1774 Fix a broken HTML anchor and update Brazil's DST transitions;
1775 there's also a slight reordering of information in tz-art.htm.
1778 Release data2008f - 2008-09-09 22:33:26 -0400
1783 Release 2008e - 2008-07-28 14:11:17 -0400
1785 changes by Arthur David Olson and Jesper Nørgaard Welen
1788 Release data2008d - 2008-07-07 09:51:38 -0400
1790 changes by Arthur David Olson, Paul Eggert, and Rodrigo Severo
1793 Release data2008c - 2008-05-19 17:48:03 -0400
1795 Pakistan, Morocco, and Mongolia
1798 Release data2008b - 2008-03-24 08:30:59 -0400
1800 including renaming Asia/Calcutta to Asia/Kolkata, with a backward
1804 Release 2008a - 2008-03-08 05:42:16 -0500
1809 Release 2007k - 2007-12-31 10:25:22 -0500
1811 most importantly, changes to the "southamerica" file based on
1812 Argentina's readoption of daylight saving time
1815 Release 2007j - 2007-12-03 09:51:01 -0500
1817 1. eliminate the "P" (parameter) macro;
1819 2. the "noncontroversial" changes circulated on the time zone
1820 mailing list (less the changes to "logwtmp.c");
1822 3. eliminate "too many transition" errors when "min" is used in time
1825 4. changes by Paul Eggert (including updated information for Venezuela).
1828 Release data2007i - 2007-10-30 10:28:11 -0400
1830 changes for Cuba and Syria
1833 Release 2007h - 2007-10-01 10:05:51 -0400
1835 changes by Paul Eggert, as well as an updated link to the ICU
1836 project in tz-link.htm
1839 Release 2007g - 2007-08-20 10:47:59 -0400
1841 changes by Paul Eggert
1843 The "leapseconds" file has been updated to incorporate the most
1844 recent International Earth Rotation and Reference Systems Service
1847 There's an addition to tz-art.htm regarding the television show "Medium".
1850 Release 2007f - 2007-05-07 10:46:46 -0400
1852 changes by Paul Eggert (including Haiti, Turks and Caicos, and New
1855 changes to zic.c to allow hour values greater than 24 (along with
1856 Paul's improved time value overflow checking)
1859 Release 2007e - 2007-04-02 10:11:52 -0400
1861 Syria and Honduras changes by Paul Eggert
1863 zic.c variable renaming changes by Arthur David Olson
1866 Release 2007d - 2007-03-20 08:48:30 -0400
1868 changes by Paul Eggert
1870 the elimination of white space at the ends of lines
1873 Release 2007c - 2007-02-26 09:09:37 -0500
1875 changes by Paul Eggert
1878 Release 2007b - 2007-02-12 09:34:20 -0500
1880 Paul Eggert's proposed change to the quotation handling logic in zic.c.
1882 changes to the commentary in "leapseconds" reflecting the IERS
1883 announcement that there is to be no positive leap second at the end
1887 Release 2007a - 2007-01-08 12:28:29 -0500
1889 changes by Paul Eggert
1891 Derick Rethan's Asmara change
1893 Oscar van Vlijmen's Easter Island local mean time change
1895 symbolic link changes
1898 Release 2006p - 2006-11-27 08:54:27 -0500
1900 changes by Paul Eggert
1903 Release 2006o - 2006-11-06 09:18:07 -0500
1905 changes by Paul Eggert
1908 Release 2006n - 2006-10-10 11:32:06 -0400
1910 changes by Paul Eggert
1913 Release 2006m - 2006-10-02 15:32:35 -0400
1915 changes for Uruguay, Palestine, and Egypt by Paul Eggert
1917 (minimalist) changes to zic.8 to clarify "until" information
1920 Release data2006l - 2006-09-18 12:58:11 -0400
1922 Paul's best-effort work on this coming weekend's Egypt time change
1925 Release 2006k - 2006-08-28 12:19:09 -0400
1927 changes by Paul Eggert
1930 Release 2006j - 2006-08-21 09:56:32 -0400
1932 changes by Paul Eggert
1935 Release code2006i - 2006-08-07 12:30:55 -0400
1939 Ken Pizzini's conversion script
1942 Release code2006h - 2006-07-24 09:19:37 -0400
1944 adds public domain notices to four files
1946 includes a fix for transition times being off by a second
1948 adds a new recording to the "arts" file (information courtesy Colin Bowern)
1951 Release 2006g - 2006-05-08 17:18:09 -0400
1953 northamerica changes by Paul Eggert
1956 Release 2006f - 2006-05-01 11:46:00 -0400
1958 a missing version number problem is fixed (with thanks to Bradley
1959 White for catching the problem)
1962 Release 2006d - 2006-04-17 14:33:43 -0400
1964 changes by Paul Eggert
1966 added new items to tz-arts.htm that were found by Paul
1969 Release 2006c - 2006-04-03 10:09:32 -0400
1971 two sets of data changes by Paul Eggert
1973 a fencepost error fix in zic.c
1975 changes to zic.c and the "europe" file to minimize differences
1976 between output produced by the old 32-bit zic and the new 64-bit
1980 Release 2006b - 2006-02-20 10:08:18 -0500
1981 [tz32code2006b + tz64code2006b + tzdata2006b]
1985 All SCCS IDs were bumped to "8.1" for this release.
1988 Release 2006a - 2006-01-30 08:59:31 -0500
1990 changes by Paul Eggert (in particular, Indiana time zone moves)
1992 an addition to the zic manual page to describe how special-case
1993 transitions are handled
1996 Release 2005r - 2005-12-27 09:27:13 -0500
1998 Canadian changes by Paul Eggert
2000 They also add "<pre>" directives to time zone data files and reflect
2001 changes to warning message logic in "zdump.c" (but with calls to
2002 "gettext" kept unbundled at the suggestion of Ken Pizzini).
2005 Release 2005q - 2005-12-13 09:17:09 -0500
2007 Nothing earth-shaking here:
2008 1. Electronic mail addresses have been removed.
2009 2. Casts of the return value of exit have been removed.
2010 3. Casts of the argument of is.* macros have been added.
2011 4. Indentation in one section of zic.c has been fixed.
2012 5. References to dead URLs in the data files have been dealt with.
2015 Release 2005p - 2005-12-05 10:30:53 -0500
2017 "systemv", "tz-link.htm", and "zdump.c" changes
2018 (less the casts of arguments to the is* macros)
2021 Release 2005o - 2005-11-28 10:55:26 -0500
2023 Georgia, Cuba, Nicaragua, and Jordan changes by Paul Eggert
2025 zdump.c lint fixes by Arthur David Olson
2028 Release 2005n - 2005-10-03 09:44:09 -0400
2030 changes by Paul Eggert (both the Uruguay changes and the Kyrgyzstan
2034 Release 2005m - 2005-08-29 12:15:40 -0400
2036 changes by Paul Eggert (with a small tweak to the tz-art change)
2038 a declaration of an unused variable has been removed from zdump.c
2041 Release 2005l - 2005-08-22 12:06:39 -0400
2043 changes by Paul Eggert
2045 overflow/underflow checks by Arthur David Olson, minus changes to
2046 the "Theory" file about the pending addition of 64-bit data (I grow
2047 less confident of the changes being accepted with each passing day,
2048 and the changes no longer increase the data files nine-fold--there's
2049 less than a doubling in size by my local Sun's reckoning)
2052 Release 2005k - 2005-07-14 14:14:24 -0400
2054 The "leapseconds" file has been edited to reflect the recently
2055 announced leap second at the end of 2005.
2057 I've also deleted electronic mail addresses from the files as an
2061 Release 2005j - 2005-06-13 14:34:13 -0400
2063 These reflect changes to limit the length of time zone abbreviations
2064 and the characters used in those abbreviations.
2066 There are also changes to handle POSIX-style "quoted" time zone
2067 environment variables.
2069 The changes were circulated on the time zone mailing list; the only
2070 change since then was the removal of a couple of minimum-length of
2071 abbreviation checks.
2074 Release data2005i - 2005-04-21 15:04:16 -0400
2076 changes (most importantly to Nicaragua and Haiti) by Paul Eggert
2079 Release 2005h - 2005-04-04 11:24:47 -0400
2081 changes by Paul Eggert
2083 minor changes to Makefile and zdump.c to produce more useful output
2084 when doing a "make typecheck"
2087 Release 2005g - 2005-03-14 10:11:21 -0500
2089 changes by Paul Eggert (a change to current DST rules in Uruguay and
2090 an update to a link to time zone software)
2093 Release 2005f - 2005-03-01 08:45:32 -0500
2095 data and documentation changes by Paul Eggert
2098 Release 2005e - 2005-02-10 15:59:44 -0500
2103 Release code2005d - 2005-01-31 09:21:47 -0500
2105 make zic complain about links to links if the -v flag is used
2107 have "make public" do more code checking
2109 add an include to "localtime.c" for the benefit of gcc systems
2112 Release 2005c - 2005-01-17 18:36:29 -0500
2114 get better results when mktime runs on a system where time_t is double
2116 changes to the data files (most importantly to Paraguay)
2119 Release 2005b - 2005-01-10 09:19:54 -0500
2121 Get localtime and gmtime working on systems with exotic time_t types.
2123 Update the leap second commentary in the "leapseconds" file.
2126 Release 2005a - 2005-01-01 13:13:44 -0500
2131 Release code2004i - 2004-12-14 13:42:58 -0500
2133 Deal with systems where time_t is unsigned.
2136 Release code2004h - 2004-12-07 11:40:18 -0500
2138 64-bit-time_t changes
2141 Release 2004g - 2004-11-02 09:06:01 -0500
2143 update to Cuba (taking effect this weekend)
2145 other changes by Paul Eggert
2147 correction of the spelling of Oslo
2149 changed versions of difftime.c and private.h
2152 Release code2004f - 2004-10-21 10:25:22 -0400
2154 Cope with wide-ranging tm_year values.
2157 Release 2004e - 2004-10-11 14:47:21 -0400
2159 Brazil/Argentina/Israel changes by Paul Eggert
2161 changes to tz-link.htm by Paul
2163 one small fix to Makefile
2166 Release 2004d - 2004-09-22 08:27:29 -0400
2168 Avoid overflow problems when TM_YEAR_BASE is added to an integer.
2171 Release 2004c - 2004-08-11 12:06:26 -0400
2173 asctime-related changes
2175 (variants of) some of the documentation changes suggested by Paul Eggert
2178 Release 2004b - 2004-07-19 14:33:35 -0400
2180 data changes by Paul Eggert - most importantly, updates for Argentina
2183 Release 2004a - 2004-05-27 12:00:47 -0400
2185 changes by Paul Eggert
2187 Handle DST transitions that occur at the end of a month in some
2188 years but at the start of the following month in other years.
2190 Add a copy of the correspondence that's the basis for claims about
2191 DST in the Navajo Nation.
2194 Release 2003e - 2003-12-15 09:36:47 -0500
2196 changes by Arthur David Olson (primarily code changes)
2198 changes by Paul Eggert (primarily data changes)
2200 minor changes to "Makefile" and "northamerica" (in the latter case,
2201 optimization of the "Toronto" rules)
2204 Release 2003d - 2003-10-06 09:34:44 -0400
2206 changes by Paul Eggert
2209 Release 2003c - 2003-09-16 10:47:05 -0400
2211 Fix bad returns in zic.c's inleap function.
2212 Thanks to Bradley White for catching the problem!
2215 Release 2003b - 2003-09-16 07:13:44 -0400
2217 Add a "--version" option (and documentation) to the zic and zdump commands.
2219 changes to overflow/underflow checking in zic
2221 a localtime typo fix.
2223 Update the leapseconds and tz-art.htm files.
2226 Release 2003a - 2003-03-24 09:30:54 -0500
2228 changes by Paul Eggert
2230 a few additions and modifications to the tz-art.htm file
2233 Release 2002d - 2002-10-15 13:12:42 -0400
2235 changes by Paul Eggert, less the "Britain (UK)" change in iso3166.tab
2237 There's also a new time zone quote in "tz-art.htm".
2240 Release 2002c - 2002-04-04 11:55:20 -0500
2242 changes by Paul Eggert
2244 Change zic.c to avoid creating symlinks to files that don't exist.
2247 Release 2002b - 2002-01-28 12:56:03 -0500
2249 [These change notes are for Release 2002a, which was corrupted.
2250 2002b was a corrected version of 2002a.]
2252 changes by Paul Eggert
2254 Update the "leapseconds" file to note that there'll be no leap
2255 second at the end of June, 2002.
2257 Change "zic.c" to deal with a problem in handling the "Asia/Bishkek" zone.
2259 Change to "difftime.c" to avoid sizeof problems.
2262 Release 2001d - 2001-10-09 13:31:32 -0400
2264 changes by Paul Eggert
2267 Release 2001c - 2001-06-05 13:59:55 -0400
2269 changes by Paul Eggert and Andrew Brown
2272 Release 2001b - 2001-04-05 16:44:38 -0400
2274 changes by Paul Eggert (modulo jnorgard's typo fix)
2276 tz-art.htm has been HTMLified.
2279 Release 2001a - 2001-03-13 12:57:44 -0500
2281 changes by Paul Eggert
2283 An addition to the "leapseconds" file: comments with the text of the
2284 latest IERS leap second notice.
2286 Trailing white space has been removed from data file lines, and
2287 repeated spaces in "Rule Jordan" lines in the "asia" file have been
2291 Release 2000h - 2000-12-14 15:33:38 -0500
2293 changes by Paul Eggert
2295 one typo fix in the "art" file
2297 With providence, this is the last update of the millennium.
2300 Release 2000g - 2000-10-10 11:35:22 -0400
2302 changes by Paul Eggert
2304 correction of John Mackin's name submitted by Robert Elz
2306 Garry Shandling's Daylight Saving Time joke (!?!) from the recent
2307 Emmy Awards broadcast.
2310 Release 2000f - 2000-08-10 09:31:58 -0400
2312 changes by Paul Eggert
2314 Added information in "tz-art.htm" on a Seinfeld reference to DST.
2316 Error checking and messages in the "yearistype" script have been
2320 Release 2000e - 2000-07-31 09:27:54 -0400
2322 data changes by Paul Eggert
2324 a change to the default value of the defined constant HAVE_STRERROR
2326 the addition of a Dave Barry quote on DST to the tz-arts file
2329 Release 2000d - 2000-04-20 15:43:04 -0400
2331 changes to the documentation and code of strftime for C99 conformance
2333 a bug fix for date.c
2335 These are based on (though modified from) changes by Paul Eggert.
2338 Release 2000c - 2000-03-04 10:31:43 -0500
2340 changes by Paul Eggert
2343 Release 2000b - 2000-02-21 12:16:29 -0500
2345 changes by Paul Eggert and Joseph Myers
2347 modest tweaks to the tz-art.htm and tz-link.htm files
2350 Release 2000a - 2000-01-18 09:21:26 -0500
2352 changes by Paul Eggert
2354 The two hypertext documents have also been renamed.
2357 Release code1999i-data1999j - 1999-11-15 18:43:22 -0500
2359 Paul Eggert's changes
2361 additions to the "zic" manual page and the "Arts.htm" file
2364 Release code1999h-data1999i - 1999-11-08 14:55:21 -0500
2369 Release data1999h - 1999-10-07 03:50:29 -0400
2371 changes by Paul Eggert to "europe" (most importantly, fixing
2372 Lithuania and Estonia)
2375 Release 1999g - 1999-09-28 11:06:18 -0400
2377 data changes by Paul Eggert (most importantly, the change for
2378 Lebanon that buys correctness for this coming Sunday)
2380 The "code" file contains changes to "Makefile" and "checktab.awk" to
2381 allow better checking of time zone files before they are published.
2384 Release 1999f - 1999-09-23 09:48:14 -0400
2386 changes by Arthur David Olson and Paul Eggert
2389 Release 1999e - 1999-08-17 15:20:54 -0400
2391 changes circulated by Paul Eggert, although the change to handling
2392 of DST-specifying time zone names has been commented out for now
2393 (search for "XXX" in "localtime.c" for details). These files also
2394 do not make any changes to the start of DST in Brazil.
2396 In addition to Paul's changes, there are updates to "Arts.htm" and
2400 Release 1999d - 1999-03-30 11:31:07 -0500
2402 changes by Paul Eggert
2404 The Makefile's "make public" rule has also been changed to do a test
2405 compile of each individual time zone data file (which should help
2406 avoid problems such as the one we had with Nicosia).
2409 Release 1999c - 1999-03-25 09:47:47 -0500
2411 changes by Paul Eggert, most importantly the change for Chile.
2414 Release 1999b - 1999-02-01 17:51:44 -0500
2416 changes by Paul Eggert
2418 code changes (suggested by Mani Varadarajan, mani at be.com) for
2419 correct handling of symbolic links when building using a relative directory
2421 code changes to generate correct messages for failed links
2423 updates to the URLs in Arts.htm
2426 Release 1999a - 1999-01-19 16:20:29 -0500
2428 error message internationalizations and corrections in zic.c and
2429 zdump.c (as suggested by Vladimir Michl, vladimir.michl at upol.cz,
2433 Release code1998h-data1998i - 1998-10-01 09:56:10 -0400
2435 changes for Brazil, Chile, and Germany
2437 support for use of "24:00" in the input files for the time zone compiler
2440 Release code1998g-data1998h - 1998-09-24 10:50:28 -0400
2442 changes by Paul Eggert
2444 correction to a define in the "private.h" file
2447 Release data1998g - 1998-08-11 03:28:35 -0000
2448 [tzdata1998g.tar.gz is missing!]
2450 Lithuanian change provided by mgedmin at pub.osf.it
2452 Move creation of the GMT link with Etc/GMT to "etcetera" (from
2453 "backward") to ensure that the GMT file is created even where folks
2454 don't want the "backward" links (as suggested by Paul Eggert).
2457 Release data1998f - 1998-07-20 13:50:00 -0000
2458 [tzdata1998f.tar.gz is missing!]
2460 Update the "leapseconds" file to include the newly-announced
2461 insertion at the end of 1998.
2464 Release code1998f - 1998-06-01 10:18:31 -0400
2466 addition to localtime.c by Guy Harris
2469 Release 1998e - 1998-05-28 09:56:26 -0400
2471 The Makefile is changed to produce zoneinfo-posix rather than
2472 zoneinfo/posix, and to produce zoneinfo-leaps rather than
2475 data changes by Paul Eggert
2477 changes from Guy Harris to provide asctime_r and ctime_r
2479 A usno1998 file (substantially identical to usno1997) has been added.
2482 Release 1998d - 1998-05-14 11:58:34 -0400
2484 changes to comments (in particular, elimination of references to CIA maps).
2485 "Arts.htm", "WWW.htm", "asia", and "australasia" are the only places
2486 where changes occur.
2489 Release 1998c - 1998-02-28 12:32:26 -0500
2491 changes by Paul Eggert (save the "French correction," on which I'll
2492 wait for the dust to settle)
2496 changes and additions to Arts.htm
2499 Release 1998b - 1998-01-17 14:31:51 -0500
2501 URL cleanups and additions
2504 Release 1998a - 1998-01-13 12:37:35 -0500
2506 changes by Paul Eggert
2509 Release code1997i-data1997k - 1997-12-29 09:53:41 -0500
2511 changes by Paul Eggert, with minor modifications from Arthur David
2512 Olson to make the files more browser friendly
2515 Release code1997h-data1997j - 1997-12-18 17:47:35 -0500
2517 minor changes to put "TZif" at the start of each time zone information file
2519 a rule has also been added to the Makefile so you can
2521 to just recompile the zone information files (rather than doing a
2522 full "make install" with its other effects).
2525 Release data1997i - 1997-10-07 08:45:38 -0400
2527 changes to Africa by Paul Eggert
2530 Release code1997g-data1997h - 1997-09-04 16:56:54 -0400
2532 corrections for Uruguay (and other locations)
2534 Arthur David Olson's simple-minded fix allowing mktime to both
2535 correctly handle leap seconds and correctly handle tm_sec values
2536 upon which arithmetic has been performed.
2539 Release code1997f-data1997g - 1997-07-19 13:15:02 -0400
2541 Paul Eggert's updates
2543 a small change to a function prototype;
2545 "Music" has been renamed "Arts.htm", HTMLified, and augmented to
2546 include information on Around the World in Eighty Days.
2549 Release code1997e-data1997f - 1997-05-03 18:52:34 -0400
2551 fixes to zic's error handling
2553 changes inspired by the item circulated on Slovenia
2555 The description of Web resources has been HTMLified for browsing
2558 A new piece of tz-related music has been added to the "Music" file.
2561 Release code1997d-data1997e - 1997-03-29 12:48:52 -0500
2563 Paul Eggert's latest suggestions
2566 Release code1997c-data1997d - 1997-03-07 20:37:54 -0500
2568 changes to "zic.c" to correct performance of the "-s" option
2570 a new file "usno1997"
2573 Release data1997c - 1997-03-04 09:58:18 -0500
2578 Release 1997b - 1997-02-27 18:34:19 -0500
2580 The data file incorporates the 1997 leap second.
2582 The code file incorporates Arthur David Olson's take on the
2583 zic/multiprocessor/directory-creation situation.
2586 Release 1997a - 1997-01-21 09:11:10 -0500
2588 Paul Eggert's Antarctica (and other changes)
2590 Arthur David Olson finessed the "getopt" issue by checking against
2591 both -1 and EOF (regardless of POSIX, SunOS 4.1.1's manual says -1
2592 is returned while SunOS 5.5's manual says EOF is returned).
2595 Release code1996o-data1996n - 1996-12-27 21:42:05 -0500
2597 Paul Eggert's latest changes
2600 Release code1996n - 1996-12-16 09:42:02 -0500
2602 link snapping fix from Bruce Evans (via Garrett Wollman)
2605 Release data1996m - 1996-11-24 02:37:34 -0000
2606 [tzdata1996m.tar.gz is missing!]
2608 Paul Eggert's batch of changes
2611 Release code1996m-data1996l - 1996-11-05 14:00:12 -0500
2613 No functional changes here; the files have simply been changed to
2614 make more use of ISO style dates in comments. The names of the above
2615 files now include the year in full.
2618 Release code96l - 1996-09-08 17:12:20 -0400
2620 tzcode96k was missing a couple of pieces.
2623 Release 96k - 1996-09-08 16:06:22 -0400
2625 the latest round of changes from Paul Eggert
2627 the recent Year 2000 material
2630 Release code96j - 1996-07-30 13:18:53 -0400
2632 Set sp->typecnt as suggested by Timothy Patrick Murphy.
2635 Release code96i - 1996-07-27 20:11:35 -0400
2637 Paul's suggested patch for strftime %V week numbers
2640 Release data96i - 1996-07-01 18:13:04 -0400
2642 "northamerica" and "europe" changes by Paul Eggert
2645 Release code96h - 1996-06-05 08:02:21 -0400
2647 fix for handling transitions specified in Universal Time
2649 Some "public domain" notices have also been added.
2652 Release code96g - 1996-05-16 14:00:26 -0400
2654 fix for the simultaneous-DST-and-zone-change challenge
2657 Release data96h - 1996-05-09 17:40:51 -0400
2659 changes by Paul Eggert
2662 Release code96f-data96g - 1996-05-03 03:09:59 -0000
2663 [tzcode96f.tar.gz + tzdata96g.tar.gz are both missing!]
2665 The changes get us some of the way to fixing the problems noted in Paul
2666 Eggert's letter yesterday (in addition to a few others). The approach
2667 has been to make zic a bit smarter about figuring out what time zone
2668 abbreviations apply just after the time specified in the "UNTIL" part
2669 of a zone line. Putting the smarts in zic means avoiding having
2670 transition times show up in both "Zone" lines and "Rule" lines, which
2671 in turn avoids multiple transition time entries in time zone files.
2672 (This also makes the zic input files such as "europe" a bit shorter and
2673 should ease maintenance.)
2676 Release data96f - 1996-04-19 19:20:03 -0000
2677 [tzdata96f.tar.gz is missing!]
2679 The only changes are to the "northamerica" file; the time zone
2680 abbreviation for Denver is corrected to MST (and MDT), and the
2681 comments for Mexico have been updated.
2684 Release data96e - 1996-03-19 17:37:26 -0500
2686 Proposals by Paul Eggert, in particular the Portugal change that
2687 comes into play at the end of this month.
2690 Release data96d - 1996-03-18 20:49:39 -0500
2695 Release code96e - 1996-02-29 15:43:27 -0000
2696 [tzcode96e.tar.gz is missing!]
2698 internationalization changes and the fix to the documentation for strftime
2701 Release code96d-data96c - 1996-02-12 11:05:27 -0500
2703 The "code" file simply updates Bob Kridle's electronic address.
2705 The "data" file updates rules for Mexico.
2708 Release data96b - 1996-01-27 15:44:42 -0500
2713 Release code96c - 1996-01-16 16:58:15 -0500
2715 leap-year streamlining and binary-search changes
2720 Release code96b - 1996-01-10 20:42:39 -0500
2722 fixes and enhancements from Paul Eggert, including code that
2723 emulates the behavior of recent versions of the SunOS "date"
2727 Release 96a - 1996-01-06 09:08:24 -0500
2731 fixes to strftime.c for correct ISO 8601 week number generation,
2732 plus support for two new formats ('G' and 'g') to give ISO 8601 year
2733 numbers (which are not necessarily the same as calendar year numbers)
2736 Release code95i-data95m - 1995-12-21 12:46:47 -0500
2738 The latest revisions from Paul Eggert are included, the usno1995
2739 file has been updated, and a new file ("WWW") covering useful URLs
2743 Release code95h-data95l - 1995-12-19 18:10:12 -0500
2745 A simplification of a macro definition, a change to data for Sudan,
2746 and (for last minute shoppers) notes in the "Music" file on the CD
2750 Release code95g-data95k - 1995-10-30 10:32:47 -0500
2752 (slightly reformatted) 8-bit-clean proposed patch
2754 minor patch: US/Eastern -> America/New_York
2756 snapshot of the USNO's latest data ("usno1995")
2758 some other minor cleanups
2761 Release code95f-data95j - 1995-10-28 21:01:34 -0000
2762 [tzcode95f.tar.gz + tzdata95j.tar.gz are both missing!]
2766 support for 64-bit time_t's
2768 optimization in localtime.c
2771 Release code95e - 1995-10-13 13:23:57 -0400
2773 the mktime change to scan from future to past when trying to find time zone
2777 Release data95i - 1995-09-26 10:43:26 -0400
2779 For Canada/Central, guess that the Sun customer's "one week too
2780 early" was just a approximation, and the true error is one month
2781 too early. This is consistent with the rest of Canada.
2784 Release data95h - 1995-09-21 11:26:48 -0400
2786 latest changes from Paul Eggert
2789 Release code95d - 1995-09-14 11:14:45 -0400
2791 the addition of a "Music" file, which documents four recorded
2792 versions of the tune "Save That Time".
2795 Release data95g - 1995-09-01 17:21:36 -0400
2797 "yearistype" correction
2800 Release data95f - 1995-08-28 20:46:56 -0400
2802 Paul Eggert's change to the australasia file
2805 Release data95e - 1995-07-08 18:02:34 -0400
2807 The only change is a leap second at the end of this year.
2808 Thanks to Bradley White for forwarding news on the leap second.
2811 Release data95d - 1995-07-03 13:26:22 -0400
2813 Paul Eggert's changes
2816 Release data95c - 1995-07-02 19:19:28 -0400
2818 changes to "asia", "backward", "europe", and "southamerica"
2819 (read: northamericacentrics need not apply)
2822 Release code95c - 1995-03-13 14:00:46 -0500
2824 one-line fix for sign extension problems in detzcode
2827 Release 95b - 1995-03-04 11:22:38 -0500
2829 Minor changes in both:
2831 The "code" file contains a workaround for the lack of "unistd.h" in
2832 Microsoft C++ version 7.
2834 The "data" file contains a fixed "Link" for America/Shiprock.
2837 Release 94h - 1994-12-10 12:51:14 -0500
2841 * incorporate the changes to "zdump" and "date" to make changes to
2842 the "TZ" environment variable permanent;
2844 * incorporate the table changes by Paul Eggert;
2846 * include (and document) support for universal time specifications in
2847 data files - but do not (yet) include use of this feature in the
2850 Think of this as "TZ Classic" - the software has been set up not to break if
2851 universal time shows up in its input, and data entries have been
2852 left as is so as not to break existing implementations.
2855 Release data94f - 1994-08-20 12:56:09 -0400
2857 (with thanks!) the latest data updates from Paul Eggert
2860 Release data94e - 1994-06-04 13:13:53 -0400
2865 Release code94g - 1994-05-05 12:14:07 -0400
2867 fix missing "optind.c" and a reference to it in the Makefile
2870 Release code94f - 1994-05-05 13:00:33 -0000
2871 [tzcode94f.tar.gz is missing!]
2873 changes to avoid overflow in difftime, as well as changes to cope
2874 with the 52/53 challenge in strftime
2877 Release code94e - 1994-03-30 23:32:59 -0500
2879 change for the benefit of PCTS
2882 Release 94d - 1994-02-24 15:42:25 -0500
2884 Avoid clashes with POSIX semantics for zones such as GMT+4.
2886 Some other very minor housekeeping is also present.
2889 Release code94c - 1994-02-10 08:52:40 -0500
2891 Fix bug where mkdirs was broken unless you compile with
2892 -fwritable-strings (which is generally losing to do).
2895 Release 94b - 1994-02-07 10:04:33 -0500
2897 work by Paul Eggert who notes:
2899 I found another book of time zone histories by E W Whitman; it's not
2900 as extensive as Shanks but has a few goodies of its own. I used it
2901 to update the tables. I also fixed some more as a result of
2902 correspondence with Adam David and Peter Ilieve, and move some stray
2903 links from 'europe' to 'backward'. I corrected some scanning errors
2906 As far as the code goes, I fixed zic to allow years in the range
2907 INT_MIN to INT_MAX; this fixed a few boundary conditions around 1900.
2908 And I cleaned up the zic documentation a little bit.
2911 Release data94a - 1994-02-03 08:58:54 -0500
2913 It simply incorporates the recently announced leap second into the
2917 Release 93g - 1993-11-22 17:28:27 -0500
2919 Paul Eggert has provided a good deal of historic information (based
2920 on Shanks), and there are some code changes to deal with the buglets
2921 that crawled out in dealing with the new information.
2924 Release 93f - 1993-10-15 12:27:46 -0400
2926 Paul Eggert's changes
2929 Release 93e - 1993-09-05 21:21:44 -0400
2931 This has updated data for Israel, England, and Kwajalein. There's
2932 also an update to "zdump" to cope with Kwajalein's 24-hour jump.
2933 Thanks to Paul Eggert and Peter Ilieve for the changes.
2936 Release 93d - 1993-06-17 23:34:17 -0400
2938 new fix and new data on Israel
2941 Release 93c - 1993-06-06 19:31:55 -0400
2946 Release 93b - 1993-02-02 14:53:58 -0500
2948 updated "leapseconds" file
2951 Release 93 - 1993-01-08 07:01:06 -0500
2953 At kre's suggestion, the package has been split in two - a code piece
2954 (which also includes documentation) that's only of use to folks who
2955 want to recompile things and a data piece useful to anyone who can
2958 The new version has a few changes to the data files, a few
2959 portability changes, and an off-by-one fix (with thanks to
2960 Tom Karzes at deshaw.com for providing a description and a
2964 Release 92c - 1992-11-21 17:35:36 -0000
2965 [tz92c.tar.Z is missing!]
2967 The fallout from the latest round of DST transitions.
2969 There are changes for Portugal, Saskatchewan, and "Pacific-New";
2970 there's also a change to "zic.c" that makes it portable to more systems.
2973 Release 92 - 1992-04-25 18:17:03 -0000
2974 [tz92.tar.Z is missing!]
2976 By popular demand (well, at any rate, following a request by kre at munnari)
2979 The 1989 update of the time zone package featured:
2981 * POSIXization (including interpretation of POSIX-style TZ environment
2982 variables, provided by Guy Harris),
2983 * ANSIfication (including versions of "mktime" and "difftime"),
2984 * SVIDulation (an "altzone" variable)
2985 * MACHination (the "gtime" function)
2986 * corrections to some time zone data (including corrections to the rules
2987 for Great Britain and New Zealand)
2988 * reference data from the United States Naval Observatory for folks who
2989 want to do additional time zones
2990 * and the 1989 data for Saudi Arabia.
2992 (Since this code will be treated as "part of the implementation" in some
2993 places and as "part of the application" in others, there's no good way to
2994 name functions, such as timegm, that are not part of the proposed ANSI C
2995 standard; such functions have kept their old, underscore-free names in this
2998 And the "dysize" function has disappeared; it was present to allow
2999 compilation of the "date" command on old BSD systems, and a version of "date"
3000 is now provided in the package. The "date" command is not created when you
3001 "make all" since it may lack options provided by the version distributed with
3002 your operating system, or may not interact with the system in the same way
3003 the native version does.
3005 Since POSIX frowns on correct leap second handling, the default behavior of
3006 the "zic" command (in the absence of a "-L" option) has been changed to omit
3007 leap second information from its output files.
3013 This file contains copies of the part of each release announcement
3014 that talks about the changes in that release. The text has been
3015 adapted and reformatted for the purposes of this file.
3017 Typically a release R consists of a pair of tarball files,
3018 tzcodeR.tar.gz and tzdataR.tar.gz. However, some releases (e.g.,
3019 code2010a, data2012c) consist of just one or the other tarball, and a
3020 few (e.g., code2012c-data2012d) have tarballs with mixed version
3023 Release time stamps are taken from the release's commit (for newer,
3024 git releases), from the newest file in the tarball (for older
3025 releases, where this info is available) or from the email announcing
3026 the release (if all else fails; these are marked with a time zone of
3027 -0000 and an "is missing!" comment).
3029 Earlier versions of the code and data were not announced on the tz
3030 list and are not summarized here.
3032 This file is in the public domain.