NEWS revision 1.10 
1News for the tz database
2
3Release 2015b - 2015-03-19 23:28:11 -0700
4
5  Changes affecting future time stamps
6
7    Mongolia will start observing DST again this year, from the last
8    Saturday in March at 02:00 to the last Saturday in September at 00:00.
9    (Thanks to Ganbold Tsagaankhuu.)
10
11    Palestine will start DST on March 28, not March 27.  Also,
12    correct the fall 2014 transition from September 26 to October 24.
13    Adjust future predictions accordingly.  (Thanks to Steffen Thorsen.)
14
15  Changes affecting past time stamps
16
17    The 1982 zone shift in Pacific/Easter has been corrected, fixing a 2015a
18    regression.  (Thanks to Stuart Bishop for reporting the problem.)
19
20    Some more zones have been turned into links, when they differed
21    from existing zones only for older time stamps.  As usual,
22    these changes affect UTC offsets in pre-1970 time stamps only.
23    Their old contents have been moved to the 'backzone' file.
24    The affected zones are: America/Antigua, America/Cayman,
25    Pacific/Midway, and Pacific/Saipan.
26
27  Changes affecting time zone abbreviations
28
29    Correct the 1992-2010 DST abbreviation in Volgograd from "MSK" to "MSD".
30    (Thanks to Hank W.)
31
32  Changes affecting code
33
34    Fix integer overflow bug in reference 'mktime' implementation.
35    (Problem reported by Jörg Richter.)
36
37    Allow -Dtime_tz=time_t compilations, and allow -Dtime_tz=... libraries
38    to be used in the same executable as standard-library time_t functions.
39    (Problems reported by Bradley White.)
40
41  Changes affecting commentary
42
43    Cite the recent Mexican decree changing Quintana Roo's time zone.
44    (Thanks to Carlos Raúl Perasso.)
45
46    Likewise for the recent Chilean decree.  (Thanks to Eduardo Romero Urra.)
47
48    Update info about Mars time.
49
50
51Release 2015a - 2015-01-29 22:35:20 -0800
52
53  Changes affecting future time stamps
54
55    The Mexican state of Quintana Roo, represented by America/Cancun,
56    will shift from Central Time with DST to Eastern Time without DST
57    on 2015-02-01 at 02:00.  (Thanks to Steffen Thorsen and Gwillim Law.)
58
59    Chile will not change clocks in April or thereafter; its new standard time
60    will be its old daylight saving time.  This affects America/Santiago,
61    Pacific/Easter, and Antarctica/Palmer.  (Thanks to Juan Correa.)
62
63    New leap second 2015-06-30 23:59:60 UTC as per IERS Bulletin C 49.
64    (Thanks to Tim Parenti.)
65
66  Changes affecting past time stamps
67
68    Iceland observed DST in 1919 and 1921, and its 1939 fallback
69    transition was Oct. 29, not Nov. 29.  Remove incorrect data from
70    Shanks about time in Iceland between 1837 and 1908.
71
72    Some more zones have been turned into links, when they differed
73    from existing zones only for older time stamps.  As usual,
74    these changes affect UTC offsets in pre-1970 time stamps only.
75    Their old contents have been moved to the 'backzone' file.
76    The affected zones are: Asia/Aden, Asia/Bahrain, Asia/Kuwait,
77    and Asia/Muscat.
78
79  Changes affecting code
80
81    tzalloc now scrubs time zone abbreviations compatibly with the way
82    that tzset always has, by replacing invalid bytes with '_' and by
83    shortening too-long abbreviations.
84
85    tzselect ports to POSIX awk implementations, no longer mishandles
86    POSIX TZ settings when GNU awk is used, and reports POSIX TZ
87    settings to the user.  (Thanks to Stefan Kuhn.)
88
89  Changes affecting build procedure
90
91    'make check' now checks for links to links in the data.
92    One such link (for Africa/Asmera) has been fixed.
93    (Thanks to Stephen Colebourne for pointing out the problem.)
94
95  Changes affecting commentary
96
97    The leapseconds file commentary now mentions the expiration date.
98    (Problem reported by Martin Burnicki.)
99
100    Update Mexican Library of Congress URL.
101
102
103Release 2014j - 2014-11-10 17:37:11 -0800
104
105  Changes affecting current and future time stamps
106
107    Turks & Caicos' switch from US eastern time to UTC-4 year-round
108    did not occur on 2014-11-02 at 02:00.  It's currently scheduled
109    for 2015-11-01 at 02:00.  (Thanks to Chris Walton.)
110
111  Changes affecting past time stamps
112
113    Many pre-1989 time stamps have been corrected for Asia/Seoul and
114    Asia/Pyongyang, based on sources for the Korean-language Wikipedia
115    entry for time in Korea.  (Thanks to Sanghyuk Jung.)  Also, no
116    longer guess that Pyongyang mimicked Seoul time after World War II,
117    as this is politically implausible.
118
119    Some more zones have been turned into links, when they differed
120    from existing zones only for older time stamps.  As usual,
121    these changes affect UTC offsets in pre-1970 time stamps only.
122    Their old contents have been moved to the 'backzone' file.
123    The affected zones are: Africa/Addis_Ababa, Africa/Asmara,
124    Africa/Dar_es_Salaam, Africa/Djibouti, Africa/Kampala,
125    Africa/Mogadishu, Indian/Antananarivo, Indian/Comoro, and
126    Indian/Mayotte.
127
128  Changes affecting commentary
129
130    The commentary is less enthusiastic about Shanks as a source,
131    and is more careful to distinguish UT from UTC.
132
133
134Release 2014i - 2014-10-21 22:04:57 -0700
135
136  Changes affecting future time stamps
137
138    Pacific/Fiji will observe DST from 2014-11-02 02:00 to 2015-01-18 03:00.
139    (Thanks to Ken Rylander for the heads-up.)  Guess that future
140    years will use a similar pattern.
141
142    A new Zone Pacific/Bougainville, for the part of Papua New Guinea
143    that plans to switch from UTC+10 to UTC+11 on 2014-12-28 at 02:00.
144    (Thanks to Kiley Walbom for the heads-up.)
145
146  Changes affecting time zone abbreviations
147
148    Since Belarus is not changing its clocks even though Moscow is,
149    the time zone abbreviation in Europe/Minsk is changing from FET
150    to its more-traditional value MSK on 2014-10-26 at 01:00.
151    (Thanks to Alexander Bokovoy for the heads-up about Belarus.)
152
153    The new abbreviation IDT stands for the pre-1976 use of UT+8 in
154    Indochina, to distinguish it better from ICT (UT+7).
155
156  Changes affecting past time stamps
157
158    Many time stamps have been corrected for Asia/Ho_Chi_Minh before 1976
159    (thanks to Trần Ngọc Quân for an indirect pointer to Trần Tiến Bình's
160    authoritative book).  Asia/Ho_Chi_Minh has been added to
161    zone1970.tab, to give tzselect users in Vietnam two choices,
162    since north and south Vietnam disagreed after our 1970 cutoff.
163
164    Asia/Phnom_Penh and Asia/Vientiane have been turned into links, as
165    they differed from existing zones only for older time stamps.  As
166    usual, these changes affect pre-1970 time stamps only.  Their old
167    contents have been moved to the 'backzone' file.
168
169  Changes affecting code
170
171    The time-related library functions now set errno on failure, and
172    some crashes in the new tzalloc-related library functions have
173    been fixed.  (Thanks to Christos Zoulas for reporting most of
174    these problems and for suggesting fixes.)
175
176    If USG_COMPAT is defined and the requested time stamp is standard time,
177    the tz library's localtime and mktime functions now set the extern
178    variable timezone to a value appropriate for that time stamp; and
179    similarly for ALTZONE, daylight saving time, and the altzone variable.
180    This change is a companion to the tzname change in 2014h, and is
181    designed to make timezone and altzone more compatible with tzname.
182
183    The tz library's functions now set errno to EOVERFLOW if they fail
184    because the result cannot be represented.  ctime and ctime_r now
185    return NULL and set errno when a time stamp is out of range, rather
186    than having undefined behavior.
187
188    Some bugs associated with the new 2014g functions have been fixed.
189    This includes a bug that largely incapacitated the new functions
190    time2posix_z and posix2time_z.  (Thanks to Christos Zoulas.)
191    It also includes some uses of uninitialized variables after tzalloc.
192    The new code uses the standard type 'ssize_t', which the Makefile
193    now gives porting advice about.
194
195  Changes affecting commentary
196
197    Updated URLs for NRC Canada (thanks to Matt Johnson and Brian Inglis).
198
199
200Release 2014h - 2014-09-25 18:59:03 -0700
201
202  Changes affecting past time stamps
203
204    America/Jamaica's 1974 spring-forward transition was Jan. 6, not Apr. 28.
205
206    Shanks says Asia/Novokuznetsk switched from LMT (not "NMT") on 1924-05-01,
207    not 1920-01-06.  The old entry was based on a misinterpretation of Shanks.
208
209    Some more zones have been turned into links, when they differed
210    from existing zones only for older time stamps.  As usual,
211    these changes affect UTC offsets in pre-1970 time stamps only.
212    Their old contents have been moved to the 'backzone' file.
213    The affected zones are: Africa/Blantyre, Africa/Bujumbura,
214    Africa/Gaborone, Africa/Harare, Africa/Kigali, Africa/Lubumbashi,
215    Africa/Lusaka, Africa/Maseru, and Africa/Mbabane.
216
217  Changes affecting code
218
219    zdump -V and -v now output gmtoff= values on all platforms,
220    not merely on platforms defining TM_GMTOFF.
221
222    The tz library's localtime and mktime functions now set tzname to a value
223    appropriate for the requested time stamp, and zdump now uses this
224    on platforms not defining TM_ZONE, fixing a 2014g regression.
225    (Thanks to Tim Parenti for reporting the problem.)
226
227    The tz library no longer sets tzname if localtime or mktime fails.
228
229    zdump -c no longer mishandles transitions near year boundaries.
230    (Thanks to Tim Parenti for reporting the problem.)
231
232    An access to uninitalized data has been fixed.
233    (Thanks to Jörg Richter for reporting the problem.)
234
235    When THREAD_SAFE is defined, the code ports to the C11 memory model.
236    A memory leak has been fixed if ALL_STATE and THREAD_SAFE are defined
237    and two threads race to initialize data used by gmtime-like functions.
238    (Thanks to Andy Heninger for reporting the problems.)
239
240  Changes affecting build procedure
241
242    'make check' now checks better for properly-sorted data.
243
244  Changes affecting documentation and commentary
245
246    zdump's gmtoff=N output is now documented, and its isdst=D output
247    is now documented to possibly output D values other than 0 or 1.
248
249    zdump -c's treatment of years is now documented to use the
250    Gregorian calendar and Universal Time without leap seconds,
251    and its behavior at cutoff boundaries is now documented better.
252    (Thanks to Arthur David Olson and Tim Parenti for reporting the problems.)
253
254    Programs are now documented to use the proleptic Gregorian calendar.
255    (Thanks to Alan Barrett for the suggestion.)
256
257    Fractional-second GMT offsets have been documented for civil time
258    in 19th-century Chennai, Jakarta, and New York.
259
260
261Release 2014g - 2014-08-28 12:31:23 -0700
262
263  Changes affecting future time stamps
264
265    Turks & Caicos is switching from US eastern time to UTC-4 year-round,
266    modeled as a switch from EST/EDT to AST on 2014-11-02 at 02:00.
267    [As noted in 2014j, this switch was later delayed.]
268
269  Changes affecting past time stamps
270
271    Time in Russia or the USSR before 1926 or so has been corrected by
272    a few seconds in the following zones: Asia/Irkutsk,
273    Asia/Krasnoyarsk, Asia/Omsk, Asia/Samarkand, Asia/Tbilisi,
274    Asia/Vladivostok, Asia/Yakutsk, Europe/Riga, Europe/Samara.  For
275    Asia/Yekaterinburg the correction is a few minutes.  (Thanks to
276    Vladimir Karpinsky.)
277
278    The Portuguese decree of 1911-05-26 took effect on 1912-01-01.
279    This affects 1911 time stamps in Africa/Bissau, Africa/Luanda,
280    Atlantic/Azores, and Atlantic/Madeira.  Also, Lisbon's pre-1912
281    GMT offset was -0:36:45 (rounded from -0:36:44.68), not -0:36:32.
282    (Thanks to Stephen Colebourne for pointing to the decree.)
283
284    Asia/Dhaka ended DST on 2009-12-31 at 24:00, not 23:59.
285
286    A new file 'backzone' contains data which may appeal to
287    connoisseurs of old time stamps, although it is out of scope for
288    the tz database, is often poorly sourced, and contains some data
289    that is known to be incorrect.  The new file is not recommended
290    for ordinary use and its entries are not installed by default.
291    (Thanks to Lester Caine for the high-quality Jersey, Guernsey, and
292    Isle of Man entries.)
293
294    Some more zones have been turned into links, when they differed
295    from existing zones only for older time stamps.  As usual,
296    these changes affect UTC offsets in pre-1970 time stamps only.
297    Their old contents have been moved to the 'backzone' file.
298    The affected zones are: Africa/Bangui, Africa/Brazzaville,
299    Africa/Douala, Africa/Kinshasa, Africa/Libreville, Africa/Luanda,
300    Africa/Malabo, Africa/Niamey, and Africa/Porto-Novo.
301
302  Changes affecting code
303
304    Unless NETBSD_INSPIRED is defined to 0, the tz library now
305    supplies functions for creating and using objects that represent
306    time zones. The new functions are tzalloc, tzfree, localtime_rz,
307    mktime_z, and (if STD_INSPIRED is also defined) posix2time_z and
308    time2posix_z.  They are intended for performance: for example,
309    localtime_rz (unlike localtime_r) is trivially thread-safe without
310    locking.  (Thanks to Christos Zoulas for proposing NetBSD-inspired
311    functions, and to Alan Barrett and Jonathan Lennox for helping to
312    debug the change.)
313
314    zdump now builds with the tz library unless USE_LTZ is defined to 0,
315    This lets zdump use tz features even if the system library lacks them.
316    To build zdump with the system library, use 'make CFLAGS=-DUSE_LTZ=0
317    TZDOBJS=zdump.o CHECK_TIME_T_ALTERNATIVES='.
318
319    zdump now uses localtime_rz if available, as it's significantly faster,
320    and it can help zdump better diagnose invalid time zone names.
321    Define HAVE_LOCALTIME_RZ to 0 to suppress this.  HAVE_LOCALTIME_RZ
322    defaults to 1 if NETBSD_INSPIRED && USE_LTZ.  When localtime_rz is
323    not available, zdump now uses localtime_r and tzset if available,
324    as this is a bit cleaner and faster than plain localtime.  Compile
325    with -DHAVE_LOCALTIME_R=0 and/or -DHAVE_TZSET=0 if your system
326    lacks these two functions.
327
328    If THREAD_SAFE is defined to 1, the tz library is now thread-safe.
329    Although not needed for tz's own applications, which are single-threaded,
330    this supports POSIX better if the tz library is used in multithreaded apps.
331
332    Some crashes have been fixed when zdump or the tz library is given
333    invalid or outlandish input.
334
335    The tz library no longer mishandles leap seconds on platforms with
336    unsigned time_t in time zones that lack ordinary transitions after 1970.
337
338    The tz code now attempts to infer TM_GMTOFF and TM_ZONE if not
339    already defined, to make it easier to configure on common platforms.
340    Define NO_TM_GMTOFF and NO_TM_ZONE to suppress this.
341
342    Unless the new macro UNINIT_TRAP is defined to 1, the tz code now
343    assumes that reading uninitialized memory yields garbage values
344    but does not cause other problems such as traps.
345
346    If TM_GMTOFF is defined and UNINIT_TRAP is 0, mktime is now
347    more likely to guess right for ambiguous time stamps near
348    transitions where tm_isdst does not change.
349
350    If HAVE_STRFTIME_L is defined to 1, the tz library now defines
351    strftime_l for compatibility with recent versions of POSIX.
352    Only the C locale is supported, though.  HAVE_STRFTIME_L defaults
353    to 1 on recent POSIX versions, and to 0 otherwise.
354
355    tzselect -c now uses a hybrid distance measure that works better
356    in Africa.  (Thanks to Alan Barrett for noting the problem.)
357
358    The C source code now ports to NetBSD when GCC_DEBUG_FLAGS is used,
359    or when time_tz is defined.
360
361    When HAVE_UTMPX_H is set the 'date' command now builds on systems
362    whose <utmpx.h> file does not define WTMPX_FILE, and when setting
363    the date it updates the wtmpx file if _PATH_WTMPX is defined.
364    This affects GNU/Linux and similar systems.
365
366    For easier maintenance later, some C code has been simplified,
367    some lint has been removed, and the code has been tweaked so that
368    plain 'make' is more likely to work.
369
370    The C type 'bool' is now used for boolean values, instead of 'int'.
371
372    The long-obsolete LOCALE_HOME code has been removed.
373
374    The long-obsolete 'gtime' function has been removed.
375
376  Changes affecting build procedure
377
378    'zdump' no longer links in ialloc.o, as it's not needed.
379
380    'make check_time_t_alternatives' no longer assumes GNU diff.
381
382  Changes affecting distribution tarballs
383
384    The files checktab.awk and zoneinfo2tdf.pl are now distributed in
385    the tzdata tarball instead of the tzcode tarball, since they help
386    maintain the data.  The NEWS and Theory files are now also
387    distributed in the tzdata tarball, as they're relevant for data.
388    (Thanks to Alan Barrett for pointing this out.)  Also, the
389    leapseconds.awk file is no longer distributed in the tzcode
390    tarball, since it belongs in the tzdata tarball (where 2014f
391    inadvertently also distributed it).
392
393  Changes affecting documentation and commentary
394
395    A new file CONTRIBUTING is distributed.  (Thanks to Tim Parenti for
396    suggesting a CONTRIBUTING file, and to Tony Finch and Walter Harms
397    for debugging it.)
398
399    The man pages have been updated to use function prototypes,
400    to document thread-safe variants like localtime_r, and to document
401    the NetBSD-inspired functions tzalloc, tzfree, localtime_rz, and
402    mktime_z.
403
404    The fields in Link lines have been renamed to be more descriptive
405    and more like the parameters of 'ln'.  LINK-FROM has become TARGET,
406    and LINK-TO has become LINK-NAME.
407
408    tz-link.htm mentions the IETF's tzdist working group; Windows
409    Runtime etc. (thanks to Matt Johnson); and HP-UX's tztab.
410
411    Some broken URLs have been fixed in the commentary.  (Thanks to
412    Lester Caine.)
413
414    Commentary about Philippines DST has been updated, and commentary
415    on pre-1970 time in India has been added.
416
417
418Release 2014f - 2014-08-05 17:42:36 -0700
419
420  Changes affecting future time stamps
421
422    Russia will subtract an hour from most of its time zones on 2014-10-26
423    at 02:00 local time.  (Thanks to Alexander Krivenyshev.)
424    There are a few exceptions: Magadan Oblast (Asia/Magadan) and Zabaykalsky
425    Krai are subtracting two hours; conversely, Chukotka Autonomous Okrug
426    (Asia/Anadyr), Kamchatka Krai (Asia/Kamchatka), Kemerovo Oblast
427    (Asia/Novokuznetsk), and the Samara Oblast and the Udmurt Republic
428    (Europe/Samara) are not changing their clocks.  The changed zones are
429    Europe/Kaliningrad, Europe/Moscow, Europe/Simferopol, Europe/Volgograd,
430    Asia/Yekaterinburg, Asia/Omsk, Asia/Novosibirsk, Asia/Krasnoyarsk,
431    Asia/Irkutsk, Asia/Yakutsk, Asia/Vladivostok, Asia/Khandyga,
432    Asia/Sakhalin, and Asia/Ust-Nera; Asia/Magadan will have two hours
433    subtracted; and Asia/Novokuznetsk's time zone abbreviation is affected,
434    but not its UTC offset.  Two zones are added: Asia/Chita (split
435    from Asia/Yakutsk, and also with two hours subtracted) and
436    Asia/Srednekolymsk (split from Asia/Magadan, but with only one hour
437    subtracted).  (Thanks to Tim Parenti for much of the above.)
438
439  Changes affecting time zone abbreviations
440
441    Australian eastern time zone abbreviations are now AEST/AEDT not EST,
442    and similarly for the other Australian zones.  That is, for eastern
443    standard and daylight saving time the abbreviations are AEST and AEDT
444    instead of the former EST for both; similarly, ACST/ACDT, ACWST/ACWDT,
445    and AWST/AWDT are now used instead of the former CST, CWST, and WST.
446    This change does not affect UTC offsets, only time zone abbreviations.
447    (Thanks to Rich Tibbett and many others.)
448
449    Asia/Novokuznetsk shifts from NOVT to KRAT (remaining on UTC+7)
450    effective 2014-10-26 at 02:00 local time.
451
452    The time zone abbreviation for Xinjiang Time (observed in Ürümqi)
453    has been changed from URUT to XJT.  (Thanks to Luther Ma.)
454
455    Prefer MSK/MSD for Moscow time in Russia, even in other cities.
456    Similarly, prefer EET/EEST for eastern European time in Russia.
457
458    Change time zone abbreviations in (western) Samoa to use "ST" and
459    "DT" suffixes, as this is more likely to match common practice.
460    Prefix "W" to (western) Samoa time when its standard-time offset
461    disagrees with that of American Samoa.
462
463    America/Metlakatla now uses PST, not MeST, to abbreviate its time zone.
464
465    Time zone abbreviations have been updated for Japan's two time
466    zones used 1896-1937.  JWST now stands for Western Standard
467    Time, and JCST for Central Standard Time (formerly this was CJT).
468    These abbreviations are now used for time in Korea, Taiwan,
469    and Sakhalin while controlled by Japan.
470
471  Changes affecting past time stamps
472
473    China's five zones have been simplified to two, since the post-1970
474    differences in the other three seem to have been imaginary.  The
475    zones Asia/Harbin, Asia/Chongqing, and Asia/Kashgar have been
476    removed; backwards-compatibility links still work, albeit with
477    different behaviors for time stamps before May 1980.  Asia/Urumqi's
478    1980 transition to UTC+8 has been removed, so that it is now at
479    UTC+6 and not UTC+8.  (Thanks to Luther Ma and to Alois Treindl;
480    Treindl sent helpful translations of two papers by Guo Qingsheng.)
481
482    Some zones have been turned into links, when they differed from existing
483    zones only for older UTC offsets where data entries were likely invented.
484    These changes affect UTC offsets in pre-1970 time stamps only.  This is
485    similar to the change in release 2013e, except this time for western
486    Africa.  The affected zones are: Africa/Bamako, Africa/Banjul,
487    Africa/Conakry, Africa/Dakar, Africa/Freetown, Africa/Lome,
488    Africa/Nouakchott, Africa/Ouagadougou, Africa/Sao_Tome, and
489    Atlantic/St_Helena.  This also affects the backwards-compatibility
490    link Africa/Timbuktu.  (Thanks to Alan Barrett, Stephen Colebourne,
491    Tim Parenti, and David Patte for reporting problems in earlier
492    versions of this change.)
493
494    Asia/Shanghai's pre-standard-time UT offset has been changed from
495    8:05:57 to 8:05:43, the location of Xujiahui Observatory.  Its
496    transition to standard time has been changed from 1928 to 1901.
497
498    Asia/Taipei switched to JWST on 1896-01-01, then to JST on 1937-10-01,
499    then to CST on 1945-09-21 at 01:00, and did not observe DST in 1945.
500    In 1946 it observed DST from 05-15 through 09-30; in 1947
501    from 04-15 through 10-31; and in 1979 from 07-01 through 09-30.
502    (Thanks to Yu-Cheng Chuang.)
503
504    Asia/Riyadh's transition to standard time is now 1947-03-14, not 1950.
505
506    Europe/Helsinki's 1942 fall-back transition was 10-04 at 01:00, not
507    10-03 at 00:00.  (Thanks to Konstantin Hyppönen.)
508
509    Pacific/Pago_Pago has been changed from UTC-11:30 to UTC-11 for the period
510    from 1911 to 1950.
511
512    Pacific/Chatham has been changed to New Zealand standard time plus
513    45 minutes for the period before 1957, reflecting a 1956 remark in
514    the New Zealand parliament.
515
516    Europe/Budapest has several pre-1946 corrections: in 1918 the transition
517    out of DST was on 09-16, not 09-29; in 1919 it was on 11-24, not 09-15; in
518    1945 it was on 11-01, not 11-03; in 1941 the transition to DST was 04-08
519    not 04-06 at 02:00; and there was no DST in 1920.
520
521    Africa/Accra is now assumed to have observed DST from 1920 through 1935.
522
523    Time in Russia before 1927 or so has been corrected by a few seconds in
524    the following zones: Europe/Moscow, Asia/Irkutsk, Asia/Tbilisi,
525    Asia/Tashkent, Asia/Vladivostok, Asia/Yekaterinburg, Europe/Helsinki, and
526    Europe/Riga.  Also, Moscow's location has been changed to its Kilometer 0
527    point.  (Thanks to Vladimir Karpinsky for the Moscow changes.)
528
529  Changes affecting data format
530
531    A new file 'zone1970.tab' supersedes 'zone.tab' in the installed data.
532    The new file's extended format allows multiple country codes per zone.
533    The older file is still installed but is deprecated; its format is
534    not changing and it will still be distributed for a while, but new
535    applications should use the new file.
536
537    The new file format simplifies maintenance of obscure locations.
538    To test this, it adds coverage for the Crozet Islands and the
539    Scattered Islands.  (Thanks to Tobias Conradi and Antoine Leca.)
540
541    The file 'iso3166.tab' is planned to switch from ASCII to UTF-8.
542    It is still ASCII now, but commentary about the switch has been added.
543    The new file 'zone1970.tab' already uses UTF-8.
544
545  Changes affecting code
546
547    'localtime', 'mktime', etc. now use much less stack space if ALL_STATE
548    is defined.  (Thanks to Elliott Hughes for reporting the problem.)
549
550    'zic' no longer mishandles input when ignoring case in locales that
551    are not compatible with English, e.g., unibyte Turkish locales when
552    compiled with HAVE_GETTEXT.
553
554    Error diagnostics of 'zic' and 'yearistype' have been reworded so that
555    they no longer use ASCII '-' as if it were a dash.
556
557    'zic' now rejects output file names that contain '.' or '..' components.
558    (Thanks to Tim Parenti for reporting the problem.)
559
560    'zic -v' now warns about output file names that do not follow
561    POSIX rules, or that contain a digit or '.'.  (Thanks to Arthur
562    David Olson for starting the ball rolling on this.)
563
564    Some lint has been removed when using GCC_DEBUG_FLAGS with GCC 4.9.0.
565
566  Changes affecting build procedure
567
568    'zic' no longer links in localtime.o and asctime.o, as they're not needed.
569    (Thanks to John Cochran.)
570
571  Changes affecting documentation and commentary
572
573    The 'Theory' file documents legacy names, the longstanding
574    exceptions to the POSIX-inspired file name rules.
575
576    The 'zic' documentation clarifies the role of time types when
577    interpreting dates.  (Thanks to Arthur David Olson.)
578
579    Documentation and commentary now prefer UTF-8 to US-ASCII,
580    allowing the use of proper accents in foreign words and names.
581    Code and data have not changed because of this.  (Thanks to
582    Garrett Wollman, Ian Abbott, and Guy Harris for helping to debug
583    this.)
584
585    Non-HTML documentation and commentary now use plain-text URLs instead of
586    HTML insertions, and are more consistent about bracketing URLs when they
587    are not already surrounded by white space.  (Thanks to suggestions by
588    Steffen Nurpmeso.)
589
590    There is new commentary about Xujiahui Observatory, the five time-zone
591    project in China from 1918 to 1949, timekeeping in Japanese-occupied
592    Shanghai, and Tibet Time in the 1950s.  The sharp-eyed can spot the
593    warlord Jin Shuren in the data.
594
595    Commentary about the coverage of each Russian zone has been standardized.
596    (Thanks to Tim Parenti).
597
598    There is new commentary about contemporary timekeeping in Ethiopia.
599
600    Obsolete comments about a 2007 proposal for DST in Kuwait has been removed.
601
602    There is new commentary about time in Poland in 1919.
603
604    Proper credit has been given to DST inventor George Vernon Hudson.
605
606    Commentary about time in Metlakatla, AK and Resolute, NU has been
607    improved, with a new source for the former.
608
609    In zone.tab, Pacific/Easter no longer mentions Salas y Gómez, as it
610    is uninhabited.
611
612    Commentary about permanent Antarctic bases has been updated.
613
614    Several typos have been corrected.  (Thanks to Tim Parenti for
615    contributing some of these fixes.)
616
617    tz-link.htm now mentions the JavaScript libraries Moment Timezone,
618    TimezoneJS.Date, Walltime-js, and Timezone.  (Thanks to a heads-up
619    from Matt Johnson.)  Also, it mentions the Go 'latlong' package.
620    (Thanks to a heads-up from Dirkjan Ochtman.)
621
622    The files usno1988, usno1989, usno1989a, usno1995, usno1997, and usno1998
623    have been removed.  These obsolescent US Naval Observatory entries were no
624    longer helpful for maintenance.  (Thanks to Tim Parenti for the suggestion.)
625
626
627Release 2014e - 2014-06-12 21:53:52 -0700
628
629  Changes affecting near-future time stamps
630
631    Egypt's 2014 Ramadan-based transitions are June 26 and July 31 at 24:00.
632    (Thanks to Imed Chihi.)  Guess that from 2015 on Egypt will temporarily
633    switch to standard time at 24:00 the last Thursday before Ramadan, and
634    back to DST at 00:00 the first Friday after Ramadan.
635
636    Similarly, Morocco's are June 28 at 03:00 and August 2 at 02:00.  (Thanks
637    to Milamber Space Network.)  Guess that from 2015 on Morocco will
638    temporarily switch to standard time at 03:00 the last Saturday before
639    Ramadan, and back to DST at 02:00 the first Saturday after Ramadan.
640
641  Changes affecting past time stamps
642
643    The abbreviation "MSM" (Moscow Midsummer Time) is now used instead of
644    "MSD" for Moscow's double daylight time in summer 1921.  Also, a typo
645    "VLASST" has been repaired to be "VLAST" for Vladivostok summer time
646    in 1991.  (Thanks to Hank W. for reporting the problems.)
647
648  Changes affecting commentary
649
650    tz-link.htm now cites RFC 7265 for jCal, mentions PTP and the
651    draft CalDAV extension, updates URLs for TSP, TZInfo, IATA, and
652    removes stale pointers to World Time Explorer and WORLDTIME.
653
654
655Release 2014d - 2014-05-27 21:34:40 -0700
656
657  Changes affecting code
658
659    zic no longer generates files containing time stamps before the Big Bang.
660    This works around GNOME bug 730332
661    <https://bugzilla.gnome.org/show_bug.cgi?id=730332>.
662    (Thanks to Leonardo Chiquitto for reporting the bug, and to
663    Arthur David Olson and James Cloos for suggesting improvements to the fix.)
664
665  Changes affecting documentation
666
667    tz-link.htm now mentions GNOME.
668
669
670Release 2014c - 2014-05-13 07:44:13 -0700
671
672  Changes affecting near-future time stamps
673
674    Egypt observes DST starting 2014-05-15 at 24:00.
675    (Thanks to Ahmad El-Dardiry and Gunther Vermier.)
676    Details have not been announced, except that DST will not be observed
677    during Ramadan.  Guess that DST will stop during the same Ramadan dates as
678    Morocco, and that Egypt's future spring and fall transitions will be the
679    same as 2010 when it last observed DST, namely April's last Friday at
680    00:00 to September's last Thursday at 23:00 standard time.  Also, guess
681    that Ramadan transitions will be at 00:00 standard time.
682
683  Changes affecting code
684
685    zic now generates transitions for minimum time values, eliminating guesswork
686    when handling low-valued time stamps.  (Thanks to Arthur David Olson.)
687
688    Port to Cygwin sans glibc.  (Thanks to Arthur David Olson.)
689
690  Changes affecting commentary and documentation
691
692    Remove now-confusing comment about Jordan.  (Thanks to Oleksii Nochovnyi.)
693
694
695Release 2014b - 2014-03-24 21:28:50 -0700
696
697  Changes affecting near-future time stamps
698
699    Crimea switches to Moscow time on 2014-03-30 at 02:00 local time.
700    (Thanks to Alexander Krivenyshev.)  Move its zone.tab entry from UA to RU.
701
702    New entry for Troll station, Antarctica.  (Thanks to Paul-Inge Flakstad and
703    Bengt-Inge Larsson.)  This is currently an approximation; a better version
704    will require the zic and localtime fixes mentioned below, and the plan is
705    to wait for a while until at least the zic fixes propagate.
706
707  Changes affecting code
708
709    'zic' and 'localtime' no longer reject locations needing four transitions
710    per year for the foreseeable future.  (Thanks to Andrew Main (Zefram).)
711    Also, 'zic' avoids some unlikely failures due to integer overflow.
712
713  Changes affecting build procedure
714
715    'make check' now detects Rule lines defined but never used.
716    The NZAQ rules, an instance of this problem, have been removed.
717
718  Changes affecting commentary and documentation
719
720    Fix Tuesday/Thursday typo in description of time in Israel.
721    (Thanks to Bert Katz via Pavel Kharitonov and Mike Frysinger.)
722
723    Microsoft Windows 8.1 doesn't support tz database names.  (Thanks
724    to Donald MacQueen.)  Instead, the Microsoft Windows Store app
725    library supports them.
726
727    Add comments about Johnston Island time in the 1960s.
728    (Thanks to Lyle McElhaney.)
729
730    Morocco's 2014 DST start will be as predicted.
731    (Thanks to Sebastien Willemijns.)
732
733
734Release 2014a - 2014-03-07 23:30:29 -0800
735
736  Changes affecting near-future time stamps
737
738    Turkey begins DST on 2014-03-31, not 03-30.  (Thanks to Faruk Pasin for
739    the heads-up, and to Tim Parenti for simplifying the update.)
740
741  Changes affecting past time stamps
742
743    Fiji ended DST on 2014-01-19 at 02:00, not the previously-scheduled 03:00.
744    (Thanks to Steffen Thorsen.)
745
746    Ukraine switched from Moscow to Eastern European time on 1990-07-01
747    (not 1992-01-01), and observed DST during the entire next winter.
748    (Thanks to Vladimir in Moscow via Alois Treindl.)
749
750    In 1988 Israel observed DST from 04-10 to 09-04, not 04-09 to 09-03.
751    (Thanks to Avigdor Finkelstein.)
752
753  Changes affecting code
754
755    A uninitialized-storage bug in 'localtime' has been fixed.
756    (Thanks to Logan Chien.)
757
758  Changes affecting the build procedure
759
760    The settings for 'make check_web' now default to Ubuntu 13.10.
761
762  Changes affecting commentary and documentation
763
764    The boundary of the US Pacific time zone is given more accurately.
765    (Thanks to Alan Mintz.)
766
767    Chile's 2014 DST will be as predicted.  (Thanks to José Miguel Garrido.)
768
769    Paraguay's 2014 DST will be as predicted.  (Thanks to Carlos Raúl Perasso.)
770
771    Better descriptions of countries with same time zone history as
772    Trinidad and Tobago since 1970.  (Thanks to Alan Barrett for suggestion.)
773
774    Several changes affect tz-link.htm, the main web page.
775
776      Mention Time.is (thanks to Even Scharning) and WX-now (thanks to
777      David Braverman).
778
779      Mention xCal (Internet RFC 6321) and jCal.
780
781      Microsoft has some support for tz database names.
782
783      CLDR data formats include both XML and JSON.
784
785      Mention Maggiolo's map of solar vs standard time.
786      (Thanks to Arthur David Olson.)
787
788      Mention TZ4Net.  (Thanks to Matt Johnson.)
789
790      Mention the timezone-olson Haskell package.
791
792      Mention zeitverschiebung.net.  (Thanks to Martin Jäger.)
793
794      Remove moribund links to daylight-savings-time.info and to
795      Simple Timer + Clocks.
796
797      Update two links.  (Thanks to Oscar van Vlijmen.)
798
799      Fix some formatting glitches, e.g., remove random newlines from
800      abbr elements' title attributes.
801
802
803Release 2013i - 2013-12-17 07:25:23 -0800
804
805  Changes affecting near-future time stamps:
806
807    Jordan switches back to standard time at 00:00 on December 20, 2013.
808    The 2006-2011 transition schedule is planned to resume in 2014.
809    (Thanks to Steffen Thorsen.)
810
811  Changes affecting past time stamps:
812
813    In 2004, Cuba began DST on March 28, not April 4.
814    (Thanks to Steffen Thorsen.)
815
816  Changes affecting code
817
818    The compile-time flag NOSOLAR has been removed, as nowadays the
819    benefit of slightly shrinking runtime table size is outweighed by the
820    cost of disallowing potential future updates that exceed old limits.
821
822  Changes affecting documentation and commentary
823
824    The files solar87, solar88, and solar89 are no longer distributed.
825    They were a negative experiment - that is, a demonstration that
826    tz data can represent solar time only with some difficulty and error.
827    Their presence in the distribution caused confusion, as Riyadh
828    civil time was generally not solar time in those years.
829
830    tz-link.htm now mentions Noda Time.  (Thanks to Matt Johnson.)
831
832
833Release 2013h - 2013-10-25 15:32:32 -0700
834
835  Changes affecting current and future time stamps:
836
837    Libya has switched its time zone back to UTC+2 without DST,
838    instead of UTC+1 with DST.  (Thanks to Even Scharning.)
839
840    Western Sahara (Africa/El_Aaiun) uses Morocco's DST rules.
841    (Thanks to Gwillim Law.)
842
843  Changes affecting future time stamps:
844
845    Acre and (we guess) western Amazonas will switch from UTC-4 to UTC-5
846    on 2013-11-10.  This affects America/Rio_Branco and America/Eirunepe.
847    (Thanks to Steffen Thorsen.)
848
849    Add entries for DST transitions in Morocco in the year 2038.
850    This avoids some year-2038 glitches introduced in 2013g.
851    (Thanks to Yoshito Umaoka for reporting the problem.)
852
853  Changes affecting API
854
855    The 'tzselect' command no longer requires the 'select' command,
856    and should now work with /bin/sh on more platforms.  It also works
857    around a bug in BusyBox awk before version 1.21.0.  (Thanks to
858    Patrick 'P. J.' McDermott and Alan Barrett.)
859
860  Changes affecting code
861
862    Fix localtime overflow bugs with 32-bit unsigned time_t.
863
864    zdump no longer assumes sscanf returns maximal values on overflow.
865
866  Changes affecting the build procedure
867
868    The builder can specify which programs to use, if any, instead of
869    'ar' and 'ranlib', and libtz.a is now built locally before being
870    installed.  (Thanks to Michael Forney.)
871
872    A dependency typo in the 'zdump' rule has been fixed.
873    (Thanks to Andrew Paprocki.)
874
875    The Makefile has been simplified by assuming that 'mkdir -p' and 'cp -f'
876    work as specified by POSIX.2-1992 or later; this is portable nowadays.
877
878    'make clean' no longer removes 'leapseconds', since it's
879    host-independent and is part of the distribution.
880
881    The unused makefile macros TZCSRCS, TZDSRCS, DATESRCS have been removed.
882
883  Changes affecting documentation and commentary
884
885    tz-link.htm now mentions TC TIMEZONE's draft time zone service protocol
886    (thanks to Mike Douglass) and TimezoneJS.Date (thanks to Jim Fehrle).
887
888    Update URLs in tz-link page.  Add URLs for Microsoft Windows, since
889    8.1 introduces tz support.  Remove URLs for Tru64 and UnixWare (no
890    longer maintained) and for old advisories.  SOFA now does C.
891
892Release 2013g - 2013-09-30 21:08:26 -0700
893
894  Changes affecting current and near-future time stamps
895
896    Morocco now observes DST from the last Sunday in March to the last
897    Sunday in October, not April to September respectively.  (Thanks
898    to Steffen Thorsen.)
899
900  Changes affecting 'zic'
901
902    'zic' now runs on platforms that lack both hard links and symlinks.
903    (Thanks to Theo Veenker for reporting the problem, for MinGW.)
904    Also, fix some bugs on platforms that lack hard links but have symlinks.
905
906    'zic -v' again warns that Asia/Tehran has no POSIX environment variable
907    to predict the far future, fixing a bug introduced in 2013e.
908
909  Changes affecting the build procedure
910
911    The 'leapseconds' file is again put into the tzdata tarball.
912    Also, 'leapseconds.awk', so tzdata is self-contained.  (Thanks to
913    Matt Burgess and Ian Abbott.)  The timestamps of these and other
914    dependent files in tarballs are adjusted more consistently.
915
916  Changes affecting documentation and commentary
917
918    The README file is now part of the data tarball as well as the code.
919    It now states that files are public domain unless otherwise specified.
920    (Thanks to Andrew Main (Zefram) for asking for clarifications.)
921    Its details about the 1989 release moved to a place of honor near
922    the end of NEWS.
923
924
925Release 2013f - 2013-09-24 23:37:36 -0700
926
927  Changes affecting near-future time stamps
928
929    Tocantins will very likely not observe DST starting this spring.
930    (Thanks to Steffen Thorsen.)
931
932    Jordan will likely stay at UTC+3 indefinitely, and will not fall
933    back this fall.
934
935    Palestine will fall back at 00:00, not 01:00.  (Thanks to Steffen Thorsen.)
936
937  Changes affecting API
938
939    The types of the global variables 'timezone' and 'altzone' (if present)
940    have been changed back to 'long'.  This is required for 'timezone'
941    by POSIX, and for 'altzone' by common practice, e.g., Solaris 11.
942    These variables were originally 'long' in the tz code, but were
943    mistakenly changed to 'time_t' in 1987; nobody reported the
944    incompatibility until now.  The difference matters on x32, where
945    'long' is 32 bits and 'time_t' is 64.  (Thanks to Elliott Hughes.)
946
947  Changes affecting the build procedure
948
949    Avoid long strings in leapseconds.awk to work around a mawk bug.
950    (Thanks to Cyril Baurand.)
951
952  Changes affecting documentation and commentary
953
954    New file 'NEWS' that contains release notes like this one.
955
956    Paraguay's law does not specify DST transition time; 00:00 is customary.
957    (Thanks to Waldemar Villamayor-Venialbo.)
958
959    Minor capitalization fixes.
960
961  Changes affecting version-control only
962
963    The experimental GitHub repository now contains annotated and
964    signed tags for recent releases, e.g., '2013e' for Release 2013e.
965    Releases are tagged starting with 2012e; earlier releases were
966    done differently, and tags would either not have a simple name or
967    not exactly match what was released.
968
969    'make set-timestamps' is now simpler and a bit more portable.
970
971
972Release 2013e - 2013-09-19 23:50:04 -0700
973
974  Changes affecting near-future time stamps
975
976    This year Fiji will start DST on October 27, not October 20.
977    (Thanks to David Wheeler for the heads-up.)  For now, guess that
978    Fiji will continue to spring forward the Sunday before the fourth
979    Monday in October.
980
981  Changes affecting current and future time zone abbreviations
982
983    Use WIB/WITA/WIT rather than WIT/CIT/EIT for alphabetic Indonesian
984    time zone abbreviations since 1932.  (Thanks to George Ziegler,
985    Priyadi Iman Nurcahyo, Zakaria, Jason Grimes, Martin Pitt, and
986    Benny Lin.)  This affects Asia/Dili, Asia/Jakarta, Asia/Jayapura,
987    Asia/Makassar, and Asia/Pontianak.
988
989    Use ART (UTC-3, standard time), rather than WARST (also UTC-3, but
990    daylight saving time) for San Luis, Argentina since 2009.
991
992  Changes affecting Godthåb time stamps after 2037 if version mismatch
993
994    Allow POSIX-like TZ strings where the transition time's hour can
995    range from -167 through 167, instead of the POSIX-required 0
996    through 24.  E.g., TZ='FJT-12FJST,M10.3.1/146,M1.3.4/75' for the
997    new Fiji rules.  This is a more-compact way to represent
998    far-future time stamps for America/Godthab, America/Santiago,
999    Antarctica/Palmer, Asia/Gaza, Asia/Hebron, Asia/Jerusalem,
1000    Pacific/Easter, and Pacific/Fiji.  Other zones are unaffected by
1001    this change.  (Derived from a suggestion by Arthur David Olson.)
1002
1003    Allow POSIX-like TZ strings where daylight saving time is in
1004    effect all year.  E.g., TZ='WART4WARST,J1/0,J365/25' for Western
1005    Argentina Summer Time all year.  This supports a more-compact way
1006    to represent the 2013d data for America/Argentina/San_Luis.
1007    Because of the change for San Luis noted above this change does not
1008    affect the current data.  (Thanks to Andrew Main (Zefram) for
1009    suggestions that improved this change.)
1010
1011    Where these two TZ changes take effect, there is a minor extension
1012    to the tz file format in that it allows new values for the
1013    embedded TZ-format string, and the tz file format version number
1014    has therefore been increased from 2 to 3 as a precaution.
1015    Version-2-based client code should continue to work as before for
1016    all time stamps before 2038.  Existing version-2-based client code
1017    (tzcode, GNU/Linux, Solaris) has been tested on version-3-format
1018    files, and typically works in practice even for time stamps after
1019    2037; the only known exception is America/Godthab.
1020
1021  Changes affecting time stamps before 1970
1022
1023    Pacific/Johnston is now a link to Pacific/Honolulu.  This corrects
1024    some errors before 1947.
1025
1026    Some zones have been turned into links, when they differ from existing
1027    zones only in older data entries that were likely invented or that
1028    differ only in LMT or transitions from LMT.  These changes affect
1029    only time stamps before 1943.  The affected zones are:
1030    Africa/Juba, America/Anguilla, America/Aruba, America/Dominica,
1031    America/Grenada, America/Guadeloupe, America/Marigot,
1032    America/Montserrat, America/St_Barthelemy, America/St_Kitts,
1033    America/St_Lucia, America/St_Thomas, America/St_Vincent,
1034    America/Tortola, and Europe/Vaduz.  (Thanks to Alois Treindl for
1035    confirming that the old Europe/Vaduz zone was wrong and the new
1036    link is better for WWII-era times.)
1037
1038    Change Kingston Mean Time from -5:07:12 to -5:07:11.  This affects
1039    America/Cayman, America/Jamaica and America/Grand_Turk time stamps
1040    from 1890 to 1912.
1041
1042    Change the UT offset of Bern Mean Time from 0:29:44 to 0:29:46.
1043    This affects Europe/Zurich time stamps from 1853 to 1894.  (Thanks
1044    to Alois Treindl).
1045
1046    Change the date of the circa-1850 Zurich transition from 1849-09-12
1047    to 1853-07-16, overriding Shanks with data from Messerli about
1048    postal and telegraph time in Switzerland.
1049
1050  Changes affecting time zone abbreviations before 1970
1051
1052    For Asia/Jakarta, use BMT (not JMT) for mean time from 1923 to 1932,
1053    as Jakarta was called Batavia back then.
1054
1055  Changes affecting API
1056
1057    The 'zic' command now outputs a dummy transition when far-future
1058    data can't be summarized using a TZ string, and uses a 402-year
1059    window rather than a 400-year window.  For the current data, this
1060    affects only the Asia/Tehran file.  It does not affect any of the
1061    time stamps that this file represents, so zdump outputs the same
1062    information as before.  (Thanks to Andrew Main (Zefram).)
1063
1064    The 'date' command has a new '-r' option, which lets you specify
1065    the integer time to display, a la FreeBSD.
1066
1067    The 'tzselect' command has two new options '-c' and '-n', which lets you
1068    select a zone based on latitude and longitude.
1069
1070    The 'zic' command's '-v' option now warns about constructs that
1071    require the new version-3 binary file format.  (Thanks to Arthur
1072    David Olson for the suggestion.)
1073
1074    Support for floating-point time_t has been removed.
1075    It was always dicey, and POSIX no longer requires it.
1076    (Thanks to Eric Blake for suggesting to the POSIX committee to
1077    remove it, and thanks to Alan Barrett, Clive D.W. Feather, Andy
1078    Heninger, Arthur David Olson, and Alois Treindl, for reporting
1079    bugs and elucidating some of the corners of the old floating-point
1080    implementation.)
1081
1082    The signatures of 'offtime', 'timeoff', and 'gtime' have been
1083    changed back to the old practice of using 'long' to represent UT
1084    offsets.  This had been inadvertently and mistakenly changed to
1085    'int_fast32_t'.  (Thanks to Christos Zoulas.)
1086
1087    The code avoids undefined behavior on integer overflow in some
1088    more places, including gmtime, localtime, mktime and zdump.
1089
1090  Changes affecting the zdump utility
1091
1092    zdump now outputs "UT" when referring to Universal Time, not "UTC".
1093    "UTC" does not make sense for time stamps that predate the introduction
1094    of UTC, whereas "UT", a more-generic term, does.  (Thanks to Steve Allen
1095    for clarifying UT vs UTC.)
1096
1097  Data changes affecting behavior of tzselect and similar programs
1098
1099    Country code BQ is now called the more-common name "Caribbean Netherlands"
1100    rather than the more-official "Bonaire, St Eustatius & Saba".
1101
1102    Remove from zone.tab the names America/Montreal, America/Shiprock,
1103    and Antarctica/South_Pole, as they are equivalent to existing
1104    same-country-code zones for post-1970 time stamps.  The data entries for
1105    these names are unchanged, so the names continue to work as before.
1106
1107  Changes affecting code internals
1108
1109    zic -c now runs way faster on 64-bit hosts when given large numbers.
1110
1111    zic now uses vfprintf to avoid allocating and freeing some memory.
1112
1113    tzselect now computes the list of continents from the data,
1114    rather than have it hard-coded.
1115
1116    Minor changes pacify GCC 4.7.3 and GCC 4.8.1.
1117
1118  Changes affecting the build procedure
1119
1120    The 'leapseconds' file is now generated automatically from a
1121    new file 'leap-seconds.list', which is a copy of
1122    <ftp://time.nist.gov/pub/leap-seconds.list>.
1123    A new source file 'leapseconds.awk' implements this.
1124    The goal is simplification of the future maintenance of 'leapseconds'.
1125
1126    When building the 'posix' or 'right' subdirectories, if the
1127    subdirectory would be a copy of the default subdirectory, it is
1128    now made a symbolic link if that is supported.  This saves about
1129    2 MB of file system space.
1130
1131    The links America/Shiprock and Antarctica/South_Pole have been
1132    moved to the 'backward' file.  This affects only nondefault builds
1133    that omit 'backward'.
1134
1135  Changes affecting version-control only
1136
1137    .gitignore now ignores 'date'.
1138
1139  Changes affecting documentation and commentary
1140
1141    Changes to the 'tzfile' man page
1142
1143      It now mentions that the binary file format may be extended in
1144      future versions by appending data.
1145
1146      It now refers to the 'zdump' and 'zic' man pages.
1147
1148    Changes to the 'zic' man page
1149
1150      It lists conditions that elicit a warning with '-v'.
1151
1152      It says that the behavior is unspecified when duplicate names
1153      are given, or if the source of one link is the target of another.
1154
1155      Its examples are updated to match the latest data.
1156
1157      The definition of white space has been clarified slightly.
1158      (Thanks to Michael Deckers.)
1159
1160    Changes to the 'Theory' file
1161
1162      There is a new section about the accuracy of the tz database,
1163      describing the many ways that errors can creep in, and
1164      explaining why so many of the pre-1970 time stamps are wrong or
1165      misleading (thanks to Steve Allen, Lester Caine, and Garrett
1166      Wollman for discussions that contributed to this).
1167
1168      The 'Theory' file describes LMT better (this follows a
1169      suggestion by Guy Harris).
1170
1171      It refers to the 2013 edition of POSIX rather than the 2004 edition.
1172
1173      It's mentioned that excluding 'backward' should not affect the
1174      other data, and it suggests at least one zone.tab name per
1175      inhabited country (thanks to Stephen Colebourne).
1176
1177      Some longstanding restrictions on names are documented, e.g.,
1178      'America/New_York' precludes 'America/New_York/Bronx'.
1179
1180      It gives more reasons for the 1970 cutoff.
1181
1182      It now mentions which time_t variants are supported, such as
1183      signed integer time_t.  (Thanks to Paul Goyette for reporting
1184      typos in an experimental version of this change.)
1185
1186      (Thanks to Philip Newton for correcting typos in these changes.)
1187
1188    Documentation and commentary is more careful to distinguish UT in
1189    general from UTC in particular.  (Thanks to Steve Allen.)
1190
1191    Add a better source for the Zurich 1894 transition.
1192    (Thanks to Pierre-Yves Berger.)
1193
1194    Update shapefile citations in tz-link.htm.  (Thanks to Guy Harris.)
1195
1196
1197Release 2013d - 2013-07-05 07:38:01 -0700
1198
1199  Changes affecting future time stamps:
1200
1201    Morocco's midsummer transitions this year are July 7 and August 10,
1202    not July 9 and August 8.  (Thanks to Andrew Paprocki.)
1203
1204    Israel now falls back on the last Sunday of October.
1205    (Thanks to Ephraim Silverberg.)
1206
1207  Changes affecting past time stamps:
1208
1209    Specify Jerusalem's location more precisely; this changes the pre-1880
1210    times by 2 s.
1211
1212  Changing affecting metadata only:
1213
1214    Fix typos in the entries for country codes BQ and SX.
1215
1216  Changes affecting code:
1217
1218    Rework the code to fix a bug with handling Australia/Macquarie on
1219    32-bit hosts (thanks to Arthur David Olson).
1220
1221    Port to platforms like NetBSD, where time_t can be wider than long.
1222
1223    Add support for testing time_t types other than the system's.
1224    Run 'make check_time_t_alternatives' to try this out.
1225    Currently, the tests fail for unsigned time_t;
1226    this should get fixed at some point.
1227
1228  Changes affecting documentation and commentary:
1229
1230    Deemphasize the significance of national borders.
1231
1232    Update the zdump man page.
1233
1234    Remove obsolete NOID comment (thanks to Denis Excoffier).
1235
1236    Update several URLs and comments in the web pages.
1237
1238    Spelling fixes (thanks to Kevin Lyda and Jonathan Leffler).
1239
1240    Update URL for CLDR Zone->Tzid table (thanks to Yoshito Umaoka).
1241
1242
1243Release 2013c - 2013-04-19 16:17:40 -0700
1244
1245  Changes affecting current and future time stamps:
1246
1247    Palestine observed DST starting March 29, 2013.  (Thanks to
1248    Steffen Thorsen.)  From 2013 on, Gaza and Hebron both observe DST,
1249    with the predicted rules being the last Thursday in March at 24:00
1250    to the first Friday on or after September 21 at 01:00.
1251
1252    Assume that the recent change to Paraguay's DST rules is permanent,
1253    by moving the end of DST to the 4th Sunday in March every year.
1254    (Thanks to Carlos Raúl Perasso.)
1255
1256  Changes affecting past time stamps:
1257
1258    Fix some historical data for Palestine to agree with that of
1259    timeanddate.com, as follows:
1260
1261	  The spring 2008 change in Gaza and Hebron was on 00:00 Mar 28, not
1262	  00:00 Apr 1.
1263
1264	  The fall 2009 change in Gaza and Hebron on Sep 4 was at 01:00, not
1265	  02:00.
1266
1267	  The spring 2010 change in Hebron was 00:00 Mar 26, not 00:01 Mar 27.
1268
1269	  The spring 2011 change in Gaza was 00:01 Apr 1, not 12:01 Apr 2.
1270
1271	  The spring 2011 change in Hebron on Apr 1 was at 00:01, not 12:01.
1272
1273	  The fall 2011 change in Hebron on Sep 30 was at 00:00, not 03:00.
1274
1275    Fix times of habitation for Macquarie to agree with the Tasmania
1276    Parks & Wildlife Service history, which indicates that permanent
1277    habitation was 1899-1919 and 1948 on.
1278
1279  Changing affecting metadata only:
1280
1281    Macquarie Island is politically part of Australia, not Antarctica.
1282    (Thanks to Tobias Conradi.)
1283
1284    Sort Macquarie more-consistently with other parts of Australia.
1285    (Thanks to Tim Parenti.)
1286
1287
1288Release 2013b - 2013-03-10 22:33:40 -0700
1289
1290  Changes affecting current and future time stamps:
1291
1292    Haiti uses US daylight-saving rules this year, and presumably future years.
1293    This changes time stamps starting today.  (Thanks to Steffen Thorsen.)
1294
1295    Paraguay will end DST on March 24 this year.
1296    (Thanks to Steffen Thorsen.)  For now, assume it's just this year.
1297
1298    Morocco does not observe DST during Ramadan;
1299    try to predict Ramadan in Morocco as best we can.
1300    (Thanks to Erik Homoet for the heads-up.)
1301
1302  Changes affecting commentary:
1303
1304    Update URLs in tz-link page.  Add URLs for webOS, BB10, iOS.
1305    Update URL for Solaris.  Mention Internet RFC 6557.
1306    Update Internet RFCs 2445->5545, 2822->5322.
1307    Switch from FTP to HTTP for Internet RFCs.
1308
1309
1310Release 2013a - 2013-02-27 09:20:35 -0800
1311
1312  Change affecting binary data format:
1313
1314    The zone offset at the end of version-2-format zone files is now
1315    allowed to be 24:00, as per POSIX.1-2008.  (Thanks to Arthur David Olson.)
1316
1317  Changes affecting current and future time stamps:
1318
1319    Chile's 2013 rules, and we guess rules for 2014 and later, will be
1320    the same as 2012, namely Apr Sun>=23 03:00 UTC to Sep Sun>=2 04:00 UTC.
1321    (Thanks to Steffen Thorsen and Robert Elz.)
1322
1323    New Zones Asia/Khandyga, Asia/Ust-Nera, Europe/Busingen.
1324    (Thanks to Tobias Conradi and Arthur David Olson.)
1325
1326  Many changes affect historical time stamps before 1940.
1327  These were deduced from: Milne J. Civil time. Geogr J. 1899
1328  Feb;13(2):173-94 <http://www.jstor.org/stable/1774359>.
1329
1330  Changes affecting the code:
1331
1332    Fix zic bug that mishandled Egypt's 2010 changes (this also affected
1333    the data).  (Thanks to Arthur David Olson.)
1334
1335    Fix localtime bug when time_t is unsigned and data files were generated
1336    by a signed time_t system.  (Thanks to Doug Bailey for reporting and
1337    to Arthur David Olson for fixing.)
1338
1339    Allow the email address for bug reports to be set by the packager.
1340    The default is tz@iana.org, as before.  (Thanks to Joseph S. Myers.)
1341
1342    Update HTML checking to be compatible with Ubuntu 12.10.
1343
1344    Check that files are a safe subset of ASCII.  At some point we may
1345    relax this requirement to a safe subset of UTF-8.  Without the
1346    check, some non-UTF-8 encodings were leaking into the distribution.
1347
1348  Commentary changes:
1349
1350    Restore a comment about copyright notices that was inadvertently deleted.
1351    (Thanks to Arthur David Olson.)
1352
1353    Improve the commentary about which districts observe what times
1354    in Russia.  (Thanks to Oscar van Vlijmen and Arthur David Olson).
1355
1356    Add web page links to tz.js.
1357
1358    Add "Run by the Monkeys" to tz-art.  (Thanks to Arthur David Olson.)
1359
1360
1361Release 2012j - 2012-11-12 18:34:49 -0800
1362
1363  Libya moved to CET this weekend, but with DST planned next year.
1364  (Thanks to Even Scharning, Steffen Thorsen, and Tim Parenti.)
1365
1366  Signatures now have the extension .asc, not .sign, as that's more
1367  standard.  (Thanks to Phil Pennock.)
1368
1369  The output of 'zdump --version', and of 'zic --version', now
1370  uses a format that is more typical for --version.
1371  (Thanks to Joseph S. Myers.)
1372
1373  The output of 'tzselect --help', 'zdump --help', and 'zic --help'
1374  now uses tz@iana.org rather than the old elsie address.
1375
1376  zic -v now complains about abbreviations that are less than 3
1377  or more than 6 characters, as per Posix.  Formerly, it checked
1378  for abbreviations that were more than 3.
1379
1380  'make public' no longer puts its temporary directory under /tmp,
1381  and uses the just-built zic rather than the system zic.
1382
1383  Various fixes to documentation and commentary.
1384
1385
1386Release 2012i - 2012-11-03 12:57:09 -0700
1387
1388  Cuba switches from DST tomorrow at 01:00.  (Thanks to Steffen Thorsen.)
1389
1390  Linker flags can now be specified via LDFLAGS.
1391  AWK now defaults to 'awk', not 'nawk'.
1392  The shell in tzselect now defaults to /bin/bash, but this can
1393  be overridden by specifying KSHELL.
1394  The main web page now mentions the unofficial GitHub repository.
1395  (Thanks to Mike Frysinger.)
1396
1397  Tarball signatures can now be built by running 'make signatures'.
1398  There are also new makefile rules 'tarballs', 'check_public', and
1399  separate makefile rules for each tarball and signature file.
1400  A few makefile rules are now more portable to strict POSIX.
1401
1402  The main web page now lists the canonical IANA URL.
1403
1404
1405Release 2012h - 2012-10-26 22:49:10 -0700
1406
1407  Bahia no longer has DST.  (Thanks to Kelley Cook.)
1408
1409  Tocantins has DST.  (Thanks to Rodrigo Severo.)
1410
1411  Israel has new DST rules next year.  (Thanks to Ephraim Silverberg.)
1412
1413  Jordan stays on DST this winter.  (Thanks to Steffen Thorsen.)
1414
1415  Web page updates.
1416
1417  More C modernization, except that at Arthur David Olson's suggestion
1418  the instances of 'register' were kept.
1419
1420
1421Release 2012g - 2012-10-17 20:59:45 -0700
1422
1423  Samoa fall 2012 and later.  (Thanks to Nicholas Pereira and Robert Elz.)
1424
1425  Palestine fall 2012.  (Thanks to Steffen Thorsen.)
1426
1427  Assume C89.
1428
1429  To attack the version-number problem, this release ships the file
1430  'Makefile' (which contains the release number) in both the tzcode and
1431  the tzdata tarballs.  The two Makefiles are identical, and should be
1432  identical in any matching pair of tarballs, so it shouldn't matter
1433  which order you extract the tarballs.  Perhaps we can come up with a
1434  better version-number scheme at some point; this scheme does have the
1435  virtue of not adding more files.
1436
1437
1438Release 2012f - 2012-09-12 23:17:03 -0700
1439
1440  * australasia (Pacific/Fiji): Fiji DST is October 21 through January
1441    20 this year.  (Thanks to Steffen Thorsen.)
1442
1443
1444Release 2012e - 2012-08-02 20:44:55 -0700
1445
1446  * australasia (Pacific/Fakaofo): Tokelau is UTC+13, not UTC+14.
1447    (Thanks to Steffen Thorsen.)
1448
1449  * Use a single version number for both code and data.
1450
1451  * .gitignore: New file.
1452
1453  * Remove trailing white space.
1454
1455
1456Release code2012c-data2012d - 2012-07-19 16:35:33 -0700
1457
1458  Changes for Morocco's time stamps, which take effect in a couple of
1459  hours, along with infrastructure changes to accommodate how the tz
1460  code and data are released on IANA.
1461
1462
1463Release data2012c - 2012-03-27 12:17:25 -0400
1464
1465  africa
1466	Summer time changes for Morocco (to start late April 2012)
1467
1468  asia
1469	Changes for 2012 for Gaza & the West Bank (Hebron) and Syria
1470
1471  northamerica
1472	Haiti following US/Canada rules for 2012 (and we're assuming,
1473	for now anyway, for the future).
1474
1475
1476Release 2012b - 2012-03-02 12:29:15 +0700
1477
1478  There is just one change to tzcode2012b (compared with 2012a):
1479  the Makefile that was accidentally included with 2012a has been
1480  replaced with the version that should have been there, which is
1481  identical with the previous version (from tzcode2011i).
1482
1483  There are just two changes in tzdata2012b compared with 2012a.
1484
1485  Most significantly, summer time in Cuba has been delayed 3 weeks
1486  (now starts April 1 rather than March 11).   Since Mar 11 (the old start
1487  date, as listed in 2012a) is just a little over a week away, this
1488  change is urgent.
1489
1490  Less importantly, an excess tab in one of the changes in zone.tab
1491  in 2012a has been removed.
1492
1493
1494Release 2012a - 2012-03-01 18:28:10 +0700
1495
1496  The changes in tzcode2012a (compared to the previous version, 2011i)
1497  are entirely to the README and tz-art.htm and tz-link.htm files, if
1498  none of those concern you, you can ignore the code update.  The changes
1499  reflect the changed addresses for the mailing list and the code and
1500  data distribution points & methods (and a link to DateTime::TimeZone::Tzfile
1501  has been added to tz-link.htm).
1502
1503  In tzdata2012a (compared to the previous release, which was 2011n)
1504  the major changes are:
1505	Chile 2011/2012 and 2012/2013 summer time date adjustments.
1506	Falkland Islands onto permanent summer time (we're assuming for the
1507		foreseeable future, though 2012 is all we're fairly certain of.)
1508	Armenia has abolished Summer Time.
1509	Tokelau jumped the International Date Line back last December
1510		(just the same as their near neighbour, Samoa).
1511	America/Creston is a new zone for a small area of British Columbia
1512	There will be a leapsecond 2012-06-30 23:59:60 UTC.
1513
1514  Other minor changes are:
1515	Corrections to 1918 Canadian summer time end dates.
1516	Updated URL for UK time zone history (in comments)
1517	A few typos in Le Corre's list of free French place names (comments)
1518
1519
1520Release data2011n - 2011-10-30 14:57:54 +0700
1521
1522  There are three changes of note - most urgently, Cuba (America/Havana)
1523  has extended summer time by two weeks, now to end on Nov 13, rather than
1524  the (already past) Oct 30.   Second, the Pridnestrovian Moldavian Republic
1525  (Europe/Tiraspol) decided not to split from the rest of Moldova after
1526  all, and consequently that zone has been removed (again) and reinstated
1527  in the "backward" file as a link to Europe/Chisinau.   And third, the
1528  end date for Fiji's summer time this summer was moved forward from the
1529  earlier planned Feb 26, to Jan 22.
1530
1531  Apart from that, Moldova (MD) returns to a single entry in zone.tab
1532  (and the incorrect syntax that was in the 2011m version of that file
1533  is so fixed - it would have been fixed in a different way had this
1534  change not happened - that's the "missing" sccs version id).
1535
1536
1537Release data2011m - 2011-10-24 21:42:16 +0700
1538
1539  In particular, the typos in comments in the data (2011-11-17 should have
1540  been 2011-10-17 as Alan Barrett noted, and spelling of Tiraspol that
1541  Tim Parenti noted) have been fixed, and the change for Ukraine has been
1542  made in all 4 Ukrainian zones, rather than just Kiev (again, thanks to
1543  Tim Parenti, and also Denys Gavrysh)
1544
1545  In addition, I added Europe/Tiraspol to zone.tab.
1546
1547  This time, all the files have new version numbers...  (including the files
1548  otherwise unchanged in 2011m that were changed in 2011l but didn't get new
1549  version numbers there...)
1550
1551
1552Release data2011l - 2011-10-10 11:15:43 +0700
1553
1554  There are just 2 changes that cause different generated tzdata files from
1555  zic, to Asia/Hebron and Pacific/Fiji - the possible change for Bahia, Brazil
1556  is included, but commented out.  Compared with the diff I sent out last week,
1557  this version also includes attributions for the sources for the changes
1558  (in much the same format as ado used, but the html tags have not been
1559  checked, verified, or used in any way at all, so if there are errors there,
1560  please let me know.)
1561
1562
1563Release data2011k - 2011-09-20 17:54:03 -0400
1564
1565  [not summarized]
1566
1567
1568Release data2011j - 2011-09-12 09:22:49 -0400
1569
1570  (contemporary changes for Samoa; past changes for Kenya, Uganda, and
1571  Tanzania); there are also two spelling corrections to comments in
1572  the australasia file (with thanks to Christos Zoulas).
1573
1574
1575Release 2011i - 2011-08-29 05:56:32 -0400
1576
1577  [not summarized]
1578
1579
1580Release data2011h - 2011-06-15 18:41:48 -0400
1581
1582  Russia and Curaçao changes
1583
1584
1585Release 2011g - 2011-04-25 09:07:22 -0400
1586
1587  update the rules for Egypt to reflect its abandonment of DST this year
1588
1589
1590Release 2011f - 2011-04-06 17:14:53 -0400
1591
1592  [not summarized]
1593
1594
1595Release 2011e - 2011-03-31 16:04:38 -0400
1596
1597  Morocco, Chile, and tz-link changes
1598
1599
1600Release 2011d - 2011-03-14 09:18:01 -0400
1601
1602  changes that impact present-day time stamps in Cuba, Samoa, and Turkey
1603
1604
1605Release 2011c - 2011-03-07 09:30:09 -0500
1606
1607  These do affect current time stamps in Chile and Annette Island, Canada.
1608
1609
1610Release 2011b - 2011-02-07 08:44:50 -0500
1611
1612  [not summarized]
1613
1614
1615Release 2011a - 2011-01-24 10:30:16 -0500
1616
1617  [not summarized]
1618
1619
1620Release data2010o - 2010-11-01 09:18:23 -0400
1621
1622  change to the end of DST in Fiji in 2011
1623
1624
1625Release 2010n - 2010-10-25 08:19:17 -0400
1626
1627  [not summarized]
1628
1629
1630Release 2010m - 2010-09-27 09:24:48 -0400
1631
1632  Hong Kong, Vostok, and zic.c changes
1633
1634
1635Release 2010l - 2010-08-16 06:57:25 -0400
1636
1637  [not summarized]
1638
1639
1640Release 2010k - 2010-07-26 10:42:27 -0400
1641
1642  [not summarized]
1643
1644
1645Release 2010j - 2010-05-10 09:07:48 -0400
1646
1647  changes for Bahía de Banderas and for version naming
1648
1649
1650Release data2010i - 2010-04-16 18:50:45 -0400
1651
1652  the end of DST in Morocco on 2010-08-08
1653
1654
1655Release data2010h - 2010-04-05 09:58:56 -0400
1656
1657  [not summarized]
1658
1659
1660Release data2010g - 2010-03-24 11:14:53 -0400
1661
1662  [not summarized]
1663
1664
1665Release 2010f - 2010-03-22 09:45:46 -0400
1666
1667  [not summarized]
1668
1669
1670Release data2010e - 2010-03-08 14:24:27 -0500
1671
1672  corrects the Dhaka bug found by Danvin Ruangchan
1673
1674
1675Release data2010d - 2010-03-06 07:26:01 -0500
1676
1677  [not summarized]
1678
1679
1680Release 2010c - 2010-03-01 09:20:58 -0500
1681
1682  changes including KRE's suggestion for earlier initialization of
1683  "goahead" and "goback" structure elements
1684
1685
1686Release code2010a - 2010-02-16 10:40:04 -0500
1687
1688  [not summarized]
1689
1690
1691Release data2010b - 2010-01-20 12:37:01 -0500
1692
1693  Mexico changes
1694
1695
1696Release data2010a - 2010-01-18 08:30:04 -0500
1697
1698  changes to Dhaka
1699
1700
1701Release data2009u - 2009-12-26 08:32:28 -0500
1702
1703  changes to DST in Bangladesh
1704
1705
1706Release 2009t - 2009-12-21 13:24:27 -0500
1707
1708  [not summarized]
1709
1710
1711Release data2009s - 2009-11-14 10:26:32 -0500
1712
1713  (cosmetic) Antarctica change and the DST-in-Fiji-in-2009-and-2010 change
1714
1715
1716Release 2009r - 2009-11-09 10:10:31 -0500
1717
1718  "antarctica" and "tz-link.htm" changes
1719
1720
1721Release 2009q - 2009-11-02 09:12:40 -0500
1722
1723  with two corrections as reported by Eric Muller and Philip Newton
1724
1725
1726Release data2009p - 2009-10-23 15:05:27 -0400
1727
1728  Argentina (including San Luis) changes (with the correction from
1729  Mariano Absatz)
1730
1731
1732Release data2009o - 2009-10-14 16:49:38 -0400
1733
1734  Samoa (commentary only), Pakistan, and Bangladesh changes
1735
1736
1737Release data2009n - 2009-09-22 15:13:38 -0400
1738
1739  added commentary for Argentina and a change to the end of DST in
1740  2009 in Pakistan
1741
1742
1743Release data2009m - 2009-09-03 10:23:43 -0400
1744
1745  Samoa and Palestine changes
1746
1747
1748Release data2009l - 2009-08-14 09:13:07 -0400
1749
1750  Samoa (comments only) and Egypt
1751
1752
1753Release 2009k - 2009-07-20 09:46:08 -0400
1754
1755  [not summarized]
1756
1757
1758Release data2009j - 2009-06-15 06:43:59 -0400
1759
1760  Bangladesh change (with a short turnaround since the DST change is
1761  impending)
1762
1763
1764Release 2009i - 2009-06-08 09:21:22 -0400
1765
1766  updating for DST in Bangladesh this year
1767
1768
1769Release 2009h - 2009-05-26 09:19:14 -0400
1770
1771  [not summarized]
1772
1773
1774Release data2009g - 2009-04-20 16:34:07 -0400
1775
1776  Cairo
1777
1778
1779Release data2009f - 2009-04-10 11:00:52 -0400
1780
1781  correct DST in Pakistan
1782
1783
1784Release 2009e - 2009-04-06 09:08:11 -0400
1785
1786  [not summarized]
1787
1788
1789Release 2009d - 2009-03-23 09:38:12 -0400
1790
1791  Morocco, Tunisia, Argentina, and American Astronomical Society changes
1792
1793
1794Release data2009c - 2009-03-16 09:47:51 -0400
1795
1796  change to the start of Cuban DST
1797
1798
1799Release 2009b - 2009-02-09 11:15:22 -0500
1800
1801  [not summarized]
1802
1803
1804Release 2009a - 2009-01-21 10:09:39 -0500
1805
1806  [not summarized]
1807
1808
1809Release data2008i - 2008-10-21 12:10:25 -0400
1810
1811  southamerica and zone.tab files, with Argentina DST rule changes and
1812  United States zone reordering and recommenting
1813
1814
1815Release 2008h - 2008-10-13 07:33:56 -0400
1816
1817  [not summarized]
1818
1819
1820Release 2008g - 2008-10-06 09:03:18 -0400
1821
1822  Fix a broken HTML anchor and update Brazil's DST transitions;
1823  there's also a slight reordering of information in tz-art.htm.
1824
1825
1826Release data2008f - 2008-09-09 22:33:26 -0400
1827
1828  [not summarized]
1829
1830
1831Release 2008e - 2008-07-28 14:11:17 -0400
1832
1833  changes by Arthur David Olson and Jesper Nørgaard Welen
1834
1835
1836Release data2008d - 2008-07-07 09:51:38 -0400
1837
1838  changes by Arthur David Olson, Paul Eggert, and Rodrigo Severo
1839
1840
1841Release data2008c - 2008-05-19 17:48:03 -0400
1842
1843  Pakistan, Morocco, and Mongolia
1844
1845
1846Release data2008b - 2008-03-24 08:30:59 -0400
1847
1848  including renaming Asia/Calcutta to Asia/Kolkata, with a backward
1849  link provided
1850
1851
1852Release 2008a - 2008-03-08 05:42:16 -0500
1853
1854  [not summarized]
1855
1856
1857Release 2007k - 2007-12-31 10:25:22 -0500
1858
1859  most importantly, changes to the "southamerica" file based on
1860  Argentina's readoption of daylight saving time
1861
1862
1863Release 2007j - 2007-12-03 09:51:01 -0500
1864
1865  1. eliminate the "P" (parameter) macro;
1866
1867  2. the "noncontroversial" changes circulated on the time zone
1868  mailing list (less the changes to "logwtmp.c");
1869
1870  3. eliminate "too many transition" errors when "min" is used in time
1871  zone rules;
1872
1873  4. changes by Paul Eggert (including updated information for Venezuela).
1874
1875
1876Release data2007i - 2007-10-30 10:28:11 -0400
1877
1878  changes for Cuba and Syria
1879
1880
1881Release 2007h - 2007-10-01 10:05:51 -0400
1882
1883  changes by Paul Eggert, as well as an updated link to the ICU
1884  project in tz-link.htm
1885
1886
1887Release 2007g - 2007-08-20 10:47:59 -0400
1888
1889  changes by Paul Eggert
1890
1891  The "leapseconds" file has been updated to incorporate the most
1892  recent International Earth Rotation and Reference Systems Service
1893  (IERS) bulletin.
1894
1895  There's an addition to tz-art.htm regarding the television show "Medium".
1896
1897
1898Release 2007f - 2007-05-07 10:46:46 -0400
1899
1900  changes by Paul Eggert (including Haiti, Turks and Caicos, and New
1901  Zealand)
1902
1903  changes to zic.c to allow hour values greater than 24 (along with
1904  Paul's improved time value overflow checking)
1905
1906
1907Release 2007e - 2007-04-02 10:11:52 -0400
1908
1909  Syria and Honduras changes by Paul Eggert
1910
1911  zic.c variable renaming changes by Arthur David Olson
1912
1913
1914Release 2007d - 2007-03-20 08:48:30 -0400
1915
1916  changes by Paul Eggert
1917
1918  the elimination of white space at the ends of lines
1919
1920
1921Release 2007c - 2007-02-26 09:09:37 -0500
1922
1923  changes by Paul Eggert
1924
1925
1926Release 2007b - 2007-02-12 09:34:20 -0500
1927
1928  Paul Eggert's proposed change to the quotation handling logic in zic.c.
1929
1930  changes to the commentary in "leapseconds" reflecting the IERS
1931  announcement that there is to be no positive leap second at the end
1932  of June 2007.
1933
1934
1935Release 2007a - 2007-01-08 12:28:29 -0500
1936
1937  changes by Paul Eggert
1938
1939  Derick Rethan's Asmara change
1940
1941  Oscar van Vlijmen's Easter Island local mean time change
1942
1943  symbolic link changes
1944
1945
1946Release 2006p - 2006-11-27 08:54:27 -0500
1947
1948  changes by Paul Eggert
1949
1950
1951Release 2006o - 2006-11-06 09:18:07 -0500
1952
1953  changes by Paul Eggert
1954
1955
1956Release 2006n - 2006-10-10 11:32:06 -0400
1957
1958  changes by Paul Eggert
1959
1960
1961Release 2006m - 2006-10-02 15:32:35 -0400
1962
1963  changes for Uruguay, Palestine, and Egypt by Paul Eggert
1964
1965  (minimalist) changes to zic.8 to clarify "until" information
1966
1967
1968Release data2006l - 2006-09-18 12:58:11 -0400
1969
1970  Paul's best-effort work on this coming weekend's Egypt time change
1971
1972
1973Release 2006k - 2006-08-28 12:19:09 -0400
1974
1975  changes by Paul Eggert
1976
1977
1978Release 2006j - 2006-08-21 09:56:32 -0400
1979
1980  changes by Paul Eggert
1981
1982
1983Release code2006i - 2006-08-07 12:30:55 -0400
1984
1985  localtime.c fixes
1986
1987  Ken Pizzini's conversion script
1988
1989
1990Release code2006h - 2006-07-24 09:19:37 -0400
1991
1992  adds public domain notices to four files
1993
1994  includes a fix for transition times being off by a second
1995
1996  adds a new recording to the "arts" file (information courtesy Colin Bowern)
1997
1998
1999Release 2006g - 2006-05-08 17:18:09 -0400
2000
2001  northamerica changes by Paul Eggert
2002
2003
2004Release 2006f - 2006-05-01 11:46:00 -0400
2005
2006  a missing version number problem is fixed (with thanks to Bradley
2007  White for catching the problem)
2008
2009
2010Release 2006d - 2006-04-17 14:33:43 -0400
2011
2012  changes by Paul Eggert
2013
2014  added new items to tz-arts.htm that were found by Paul
2015
2016
2017Release 2006c - 2006-04-03 10:09:32 -0400
2018
2019  two sets of data changes by Paul Eggert
2020
2021  a fencepost error fix in zic.c
2022
2023  changes to zic.c and the "europe" file to minimize differences
2024  between output produced by the old 32-bit zic and the new 64-bit
2025  version
2026
2027
2028Release 2006b - 2006-02-20 10:08:18 -0500
2029  [tz32code2006b + tz64code2006b + tzdata2006b]
2030
2031  64-bit code
2032
2033  All SCCS IDs were bumped to "8.1" for this release.
2034
2035
2036Release 2006a - 2006-01-30 08:59:31 -0500
2037
2038  changes by Paul Eggert (in particular, Indiana time zone moves)
2039
2040  an addition to the zic manual page to describe how special-case
2041  transitions are handled
2042
2043
2044Release 2005r - 2005-12-27 09:27:13 -0500
2045
2046  Canadian changes by Paul Eggert
2047
2048  They also add "<pre>" directives to time zone data files and reflect
2049  changes to warning message logic in "zdump.c" (but with calls to
2050  "gettext" kept unbundled at the suggestion of Ken Pizzini).
2051
2052
2053Release 2005q - 2005-12-13 09:17:09 -0500
2054
2055  Nothing earth-shaking here:
2056	1.  Electronic mail addresses have been removed.
2057	2.  Casts of the return value of exit have been removed.
2058	3.  Casts of the argument of is.* macros have been added.
2059	4.  Indentation in one section of zic.c has been fixed.
2060	5.  References to dead URLs in the data files have been dealt with.
2061
2062
2063Release 2005p - 2005-12-05 10:30:53 -0500
2064
2065  "systemv", "tz-link.htm", and "zdump.c" changes
2066  (less the casts of arguments to the is* macros)
2067
2068
2069Release 2005o - 2005-11-28 10:55:26 -0500
2070
2071  Georgia, Cuba, Nicaragua, and Jordan changes by Paul Eggert
2072
2073  zdump.c lint fixes by Arthur David Olson
2074
2075
2076Release 2005n - 2005-10-03 09:44:09 -0400
2077
2078  changes by Paul Eggert (both the Uruguay changes and the Kyrgyzstan
2079  et al. changes)
2080
2081
2082Release 2005m - 2005-08-29 12:15:40 -0400
2083
2084  changes by Paul Eggert (with a small tweak to the tz-art change)
2085
2086  a declaration of an unused variable has been removed from zdump.c
2087
2088
2089Release 2005l - 2005-08-22 12:06:39 -0400
2090
2091  changes by Paul Eggert
2092
2093  overflow/underflow checks by Arthur David Olson, minus changes to
2094  the "Theory" file about the pending addition of 64-bit data (I grow
2095  less confident of the changes being accepted with each passing day,
2096  and the changes no longer increase the data files nine-fold--there's
2097  less than a doubling in size by my local Sun's reckoning)
2098
2099
2100Release 2005k - 2005-07-14 14:14:24 -0400
2101
2102  The "leapseconds" file has been edited to reflect the recently
2103  announced leap second at the end of 2005.
2104
2105  I've also deleted electronic mail addresses from the files as an
2106  anti-spam measure.
2107
2108
2109Release 2005j - 2005-06-13 14:34:13 -0400
2110
2111  These reflect changes to limit the length of time zone abbreviations
2112  and the characters used in those abbreviations.
2113
2114  There are also changes to handle POSIX-style "quoted" time zone
2115  environment variables.
2116
2117  The changes were circulated on the time zone mailing list; the only
2118  change since then was the removal of a couple of minimum-length of
2119  abbreviation checks.
2120
2121
2122Release data2005i - 2005-04-21 15:04:16 -0400
2123
2124  changes (most importantly to Nicaragua and Haiti) by Paul Eggert
2125
2126
2127Release 2005h - 2005-04-04 11:24:47 -0400
2128
2129  changes by Paul Eggert
2130
2131  minor changes to Makefile and zdump.c to produce more useful output
2132  when doing a "make typecheck"
2133
2134
2135Release 2005g - 2005-03-14 10:11:21 -0500
2136
2137  changes by Paul Eggert (a change to current DST rules in Uruguay and
2138  an update to a link to time zone software)
2139
2140
2141Release 2005f - 2005-03-01 08:45:32 -0500
2142
2143  data and documentation changes by Paul Eggert
2144
2145
2146Release 2005e - 2005-02-10 15:59:44 -0500
2147
2148  [not summarized]
2149
2150
2151Release code2005d - 2005-01-31 09:21:47 -0500
2152
2153  make zic complain about links to links if the -v flag is used
2154
2155  have "make public" do more code checking
2156
2157  add an include to "localtime.c" for the benefit of gcc systems
2158
2159
2160Release 2005c - 2005-01-17 18:36:29 -0500
2161
2162  get better results when mktime runs on a system where time_t is double
2163
2164  changes to the data files (most importantly to Paraguay)
2165
2166
2167Release 2005b - 2005-01-10 09:19:54 -0500
2168
2169  Get localtime and gmtime working on systems with exotic time_t types.
2170
2171  Update the leap second commentary in the "leapseconds" file.
2172
2173
2174Release 2005a - 2005-01-01 13:13:44 -0500
2175
2176  [not summarized]
2177
2178
2179Release code2004i - 2004-12-14 13:42:58 -0500
2180
2181  Deal with systems where time_t is unsigned.
2182
2183
2184Release code2004h - 2004-12-07 11:40:18 -0500
2185
2186  64-bit-time_t changes
2187
2188
2189Release 2004g - 2004-11-02 09:06:01 -0500
2190
2191  update to Cuba (taking effect this weekend)
2192
2193  other changes by Paul Eggert
2194
2195  correction of the spelling of Oslo
2196
2197  changed versions of difftime.c and private.h
2198
2199
2200Release code2004f - 2004-10-21 10:25:22 -0400
2201
2202  Cope with wide-ranging tm_year values.
2203
2204
2205Release 2004e - 2004-10-11 14:47:21 -0400
2206
2207  Brazil/Argentina/Israel changes by Paul Eggert
2208
2209  changes to tz-link.htm by Paul
2210
2211  one small fix to Makefile
2212
2213
2214Release 2004d - 2004-09-22 08:27:29 -0400
2215
2216  Avoid overflow problems when TM_YEAR_BASE is added to an integer.
2217
2218
2219Release 2004c - 2004-08-11 12:06:26 -0400
2220
2221  asctime-related changes
2222
2223  (variants of) some of the documentation changes suggested by Paul Eggert
2224
2225
2226Release 2004b - 2004-07-19 14:33:35 -0400
2227
2228  data changes by Paul Eggert - most importantly, updates for Argentina
2229
2230
2231Release 2004a - 2004-05-27 12:00:47 -0400
2232
2233  changes by Paul Eggert
2234
2235  Handle DST transitions that occur at the end of a month in some
2236  years but at the start of the following month in other years.
2237
2238  Add a copy of the correspondence that's the basis for claims about
2239  DST in the Navajo Nation.
2240
2241
2242Release 2003e - 2003-12-15 09:36:47 -0500
2243
2244  changes by Arthur David Olson (primarily code changes)
2245
2246  changes by Paul Eggert (primarily data changes)
2247
2248  minor changes to "Makefile" and "northamerica" (in the latter case,
2249  optimization of the "Toronto" rules)
2250
2251
2252Release 2003d - 2003-10-06 09:34:44 -0400
2253
2254  changes by Paul Eggert
2255
2256
2257Release 2003c - 2003-09-16 10:47:05 -0400
2258
2259  Fix bad returns in zic.c's inleap function.
2260  Thanks to Bradley White for catching the problem!
2261
2262
2263Release 2003b - 2003-09-16 07:13:44 -0400
2264
2265  Add a "--version" option (and documentation) to the zic and zdump commands.
2266
2267  changes to overflow/underflow checking in zic
2268
2269  a localtime typo fix.
2270
2271  Update the leapseconds and tz-art.htm files.
2272
2273
2274Release 2003a - 2003-03-24 09:30:54 -0500
2275
2276  changes by Paul Eggert
2277
2278  a few additions and modifications to the tz-art.htm file
2279
2280
2281Release 2002d - 2002-10-15 13:12:42 -0400
2282
2283  changes by Paul Eggert, less the "Britain (UK)" change in iso3166.tab
2284
2285  There's also a new time zone quote in "tz-art.htm".
2286
2287
2288Release 2002c - 2002-04-04 11:55:20 -0500
2289
2290  changes by Paul Eggert
2291
2292  Change zic.c to avoid creating symlinks to files that don't exist.
2293
2294
2295Release 2002b - 2002-01-28 12:56:03 -0500
2296
2297  [These change notes are for Release 2002a, which was corrupted.
2298  2002b was a corrected version of 2002a.]
2299
2300  changes by Paul Eggert
2301
2302  Update the "leapseconds" file to note that there'll be no leap
2303  second at the end of June, 2002.
2304
2305  Change "zic.c" to deal with a problem in handling the "Asia/Bishkek" zone.
2306
2307  Change to "difftime.c" to avoid sizeof problems.
2308
2309
2310Release 2001d - 2001-10-09 13:31:32 -0400
2311
2312  changes by Paul Eggert
2313
2314
2315Release 2001c - 2001-06-05 13:59:55 -0400
2316
2317  changes by Paul Eggert and Andrew Brown
2318
2319
2320Release 2001b - 2001-04-05 16:44:38 -0400
2321
2322  changes by Paul Eggert (modulo jnorgard's typo fix)
2323
2324  tz-art.htm has been HTMLified.
2325
2326
2327Release 2001a - 2001-03-13 12:57:44 -0500
2328
2329  changes by Paul Eggert
2330
2331  An addition to the "leapseconds" file: comments with the text of the
2332  latest IERS leap second notice.
2333
2334  Trailing white space has been removed from data file lines, and
2335  repeated spaces in "Rule Jordan" lines in the "asia" file have been
2336  converted to tabs.
2337
2338
2339Release 2000h - 2000-12-14 15:33:38 -0500
2340
2341  changes by Paul Eggert
2342
2343  one typo fix in the "art" file
2344
2345  With providence, this is the last update of the millennium.
2346
2347
2348Release 2000g - 2000-10-10 11:35:22 -0400
2349
2350  changes by Paul Eggert
2351
2352  correction of John Mackin's name submitted by Robert Elz
2353
2354  Garry Shandling's Daylight Saving Time joke (!?!) from the recent
2355  Emmy Awards broadcast.
2356
2357
2358Release 2000f - 2000-08-10 09:31:58 -0400
2359
2360  changes by Paul Eggert
2361
2362  Added information in "tz-art.htm" on a Seinfeld reference to DST.
2363
2364  Error checking and messages in the "yearistype" script have been
2365  improved.
2366
2367
2368Release 2000e - 2000-07-31 09:27:54 -0400
2369
2370  data changes by Paul Eggert
2371
2372  a change to the default value of the defined constant HAVE_STRERROR
2373
2374  the addition of a Dave Barry quote on DST to the tz-arts file
2375
2376
2377Release 2000d - 2000-04-20 15:43:04 -0400
2378
2379  changes to the documentation and code of strftime for C99 conformance
2380
2381  a bug fix for date.c
2382
2383  These are based on (though modified from) changes by Paul Eggert.
2384
2385
2386Release 2000c - 2000-03-04 10:31:43 -0500
2387
2388  changes by Paul Eggert
2389
2390
2391Release 2000b - 2000-02-21 12:16:29 -0500
2392
2393  changes by Paul Eggert and Joseph Myers
2394
2395  modest tweaks to the tz-art.htm and tz-link.htm files
2396
2397
2398Release 2000a - 2000-01-18 09:21:26 -0500
2399
2400  changes by Paul Eggert
2401
2402  The two hypertext documents have also been renamed.
2403
2404
2405Release code1999i-data1999j - 1999-11-15 18:43:22 -0500
2406
2407  Paul Eggert's changes
2408
2409  additions to the "zic" manual page and the "Arts.htm" file
2410
2411
2412Release code1999h-data1999i - 1999-11-08 14:55:21 -0500
2413
2414  [not summarized]
2415
2416
2417Release data1999h - 1999-10-07 03:50:29 -0400
2418
2419  changes by Paul Eggert to "europe" (most importantly, fixing
2420  Lithuania and Estonia)
2421
2422
2423Release 1999g - 1999-09-28 11:06:18 -0400
2424
2425  data changes by Paul Eggert (most importantly, the change for
2426  Lebanon that buys correctness for this coming Sunday)
2427
2428  The "code" file contains changes to "Makefile" and "checktab.awk" to
2429  allow better checking of time zone files before they are published.
2430
2431
2432Release 1999f - 1999-09-23 09:48:14 -0400
2433
2434  changes by Arthur David Olson and Paul Eggert
2435
2436
2437Release 1999e - 1999-08-17 15:20:54 -0400
2438
2439  changes circulated by Paul Eggert, although the change to handling
2440  of DST-specifying time zone names has been commented out for now
2441  (search for "XXX" in "localtime.c" for details).  These files also
2442  do not make any changes to the start of DST in Brazil.
2443
2444  In addition to Paul's changes, there are updates to "Arts.htm" and
2445  cleanups of URLs.
2446
2447
2448Release 1999d - 1999-03-30 11:31:07 -0500
2449
2450  changes by Paul Eggert
2451
2452  The Makefile's "make public" rule has also been changed to do a test
2453  compile of each individual time zone data file (which should help
2454  avoid problems such as the one we had with Nicosia).
2455
2456
2457Release 1999c - 1999-03-25 09:47:47 -0500
2458
2459  changes by Paul Eggert, most importantly the change for Chile.
2460
2461
2462Release 1999b - 1999-02-01 17:51:44 -0500
2463
2464  changes by Paul Eggert
2465
2466  code changes (suggested by Mani Varadarajan, mani at be.com) for
2467  correct handling of symbolic links when building using a relative directory
2468
2469  code changes to generate correct messages for failed links
2470
2471  updates to the URLs in Arts.htm
2472
2473
2474Release 1999a - 1999-01-19 16:20:29 -0500
2475
2476  error message internationalizations and corrections in zic.c and
2477  zdump.c (as suggested by Vladimir Michl, vladimir.michl at upol.cz,
2478  to whom thanks!)
2479
2480
2481Release code1998h-data1998i - 1998-10-01 09:56:10 -0400
2482
2483  changes for Brazil, Chile, and Germany
2484
2485  support for use of "24:00" in the input files for the time zone compiler
2486
2487
2488Release code1998g-data1998h - 1998-09-24 10:50:28 -0400
2489
2490  changes by Paul Eggert
2491
2492  correction to a define in the "private.h" file
2493
2494
2495Release data1998g - 1998-08-11 03:28:35 -0000
2496  [tzdata1998g.tar.gz is missing!]
2497
2498  Lithuanian change provided by mgedmin at pub.osf.it
2499
2500  Move creation of the GMT link with Etc/GMT to "etcetera" (from
2501  "backward") to ensure that the GMT file is created even where folks
2502  don't want the "backward" links (as suggested by Paul Eggert).
2503
2504
2505Release data1998f - 1998-07-20 13:50:00 -0000
2506  [tzdata1998f.tar.gz is missing!]
2507
2508  Update the "leapseconds" file to include the newly-announced
2509  insertion at the end of 1998.
2510
2511
2512Release code1998f - 1998-06-01 10:18:31 -0400
2513
2514  addition to localtime.c by Guy Harris
2515
2516
2517Release 1998e - 1998-05-28 09:56:26 -0400
2518
2519  The Makefile is changed to produce zoneinfo-posix rather than
2520  zoneinfo/posix, and to produce zoneinfo-leaps rather than
2521  zoneinfo/right.
2522
2523  data changes by Paul Eggert
2524
2525  changes from Guy Harris to provide asctime_r and ctime_r
2526
2527  A usno1998 file (substantially identical to usno1997) has been added.
2528
2529
2530Release 1998d - 1998-05-14 11:58:34 -0400
2531
2532  changes to comments (in particular, elimination of references to CIA maps).
2533  "Arts.htm", "WWW.htm", "asia", and "australasia" are the only places
2534  where changes occur.
2535
2536
2537Release 1998c - 1998-02-28 12:32:26 -0500
2538
2539  changes by Paul Eggert (save the "French correction," on which I'll
2540  wait for the dust to settle)
2541
2542  symlink changes
2543
2544  changes and additions to Arts.htm
2545
2546
2547Release 1998b - 1998-01-17 14:31:51 -0500
2548
2549  URL cleanups and additions
2550
2551
2552Release 1998a - 1998-01-13 12:37:35 -0500
2553
2554  changes by Paul Eggert
2555
2556
2557Release code1997i-data1997k - 1997-12-29 09:53:41 -0500
2558
2559  changes by Paul Eggert, with minor modifications from Arthur David
2560  Olson to make the files more browser friendly
2561
2562
2563Release code1997h-data1997j - 1997-12-18 17:47:35 -0500
2564
2565  minor changes to put "TZif" at the start of each time zone information file
2566
2567  a rule has also been added to the Makefile so you can
2568	make zones
2569  to just recompile the zone information files (rather than doing a
2570  full "make install" with its other effects).
2571
2572
2573Release data1997i - 1997-10-07 08:45:38 -0400
2574
2575  changes to Africa by Paul Eggert
2576
2577
2578Release code1997g-data1997h - 1997-09-04 16:56:54 -0400
2579
2580  corrections for Uruguay (and other locations)
2581
2582  Arthur David Olson's simple-minded fix allowing mktime to both
2583  correctly handle leap seconds and correctly handle tm_sec values
2584  upon which arithmetic has been performed.
2585
2586
2587Release code1997f-data1997g - 1997-07-19 13:15:02 -0400
2588
2589  Paul Eggert's updates
2590
2591  a small change to a function prototype;
2592
2593  "Music" has been renamed "Arts.htm", HTMLified, and augmented to
2594  include information on Around the World in Eighty Days.
2595
2596
2597Release code1997e-data1997f - 1997-05-03 18:52:34 -0400
2598
2599  fixes to zic's error handling
2600
2601  changes inspired by the item circulated on Slovenia
2602
2603  The description of Web resources has been HTMLified for browsing
2604  convenience.
2605
2606  A new piece of tz-related music has been added to the "Music" file.
2607
2608
2609Release code1997d-data1997e - 1997-03-29 12:48:52 -0500
2610
2611  Paul Eggert's latest suggestions
2612
2613
2614Release code1997c-data1997d - 1997-03-07 20:37:54 -0500
2615
2616  changes to "zic.c" to correct performance of the "-s" option
2617
2618  a new file "usno1997"
2619
2620
2621Release data1997c - 1997-03-04 09:58:18 -0500
2622
2623  changes in Israel
2624
2625
2626Release 1997b - 1997-02-27 18:34:19 -0500
2627
2628  The data file incorporates the 1997 leap second.
2629
2630  The code file incorporates Arthur David Olson's take on the
2631  zic/multiprocessor/directory-creation situation.
2632
2633
2634Release 1997a - 1997-01-21 09:11:10 -0500
2635
2636  Paul Eggert's Antarctica (and other changes)
2637
2638  Arthur David Olson finessed the "getopt" issue by checking against
2639  both -1 and EOF (regardless of POSIX, SunOS 4.1.1's manual says -1
2640  is returned while SunOS 5.5's manual says EOF is returned).
2641
2642
2643Release code1996o-data1996n - 1996-12-27 21:42:05 -0500
2644
2645  Paul Eggert's latest changes
2646
2647
2648Release code1996n - 1996-12-16 09:42:02 -0500
2649
2650  link snapping fix from Bruce Evans (via Garrett Wollman)
2651
2652
2653Release data1996m - 1996-11-24 02:37:34 -0000
2654  [tzdata1996m.tar.gz is missing!]
2655
2656  Paul Eggert's batch of changes
2657
2658
2659Release code1996m-data1996l - 1996-11-05 14:00:12 -0500
2660
2661  No functional changes here; the files have simply been changed to
2662  make more use of ISO style dates in comments. The names of the above
2663  files now include the year in full.
2664
2665
2666Release code96l - 1996-09-08 17:12:20 -0400
2667
2668  tzcode96k was missing a couple of pieces.
2669
2670
2671Release 96k - 1996-09-08 16:06:22 -0400
2672
2673  the latest round of changes from Paul Eggert
2674
2675  the recent Year 2000 material
2676
2677
2678Release code96j - 1996-07-30 13:18:53 -0400
2679
2680  Set sp->typecnt as suggested by Timothy Patrick Murphy.
2681
2682
2683Release code96i - 1996-07-27 20:11:35 -0400
2684
2685  Paul's suggested patch for strftime %V week numbers
2686
2687
2688Release data96i - 1996-07-01 18:13:04 -0400
2689
2690  "northamerica" and "europe" changes by Paul Eggert
2691
2692
2693Release code96h - 1996-06-05 08:02:21 -0400
2694
2695  fix for handling transitions specified in Universal Time
2696
2697  Some "public domain" notices have also been added.
2698
2699
2700Release code96g - 1996-05-16 14:00:26 -0400
2701
2702  fix for the simultaneous-DST-and-zone-change challenge
2703
2704
2705Release data96h - 1996-05-09 17:40:51 -0400
2706
2707  changes by Paul Eggert
2708
2709
2710Release code96f-data96g - 1996-05-03 03:09:59 -0000
2711  [tzcode96f.tar.gz + tzdata96g.tar.gz are both missing!]
2712
2713  The changes get us some of the way to fixing the problems noted in Paul
2714  Eggert's letter yesterday (in addition to a few others).  The approach
2715  has been to make zic a bit smarter about figuring out what time zone
2716  abbreviations apply just after the time specified in the "UNTIL" part
2717  of a zone line.  Putting the smarts in zic means avoiding having
2718  transition times show up in both "Zone" lines and "Rule" lines, which
2719  in turn avoids multiple transition time entries in time zone files.
2720  (This also makes the zic input files such as "europe" a bit shorter and
2721  should ease maintenance.)
2722
2723
2724Release data96f - 1996-04-19 19:20:03 -0000
2725  [tzdata96f.tar.gz is missing!]
2726
2727  The only changes are to the "northamerica" file; the time zone
2728  abbreviation for Denver is corrected to MST (and MDT), and the
2729  comments for Mexico have been updated.
2730
2731
2732Release data96e - 1996-03-19 17:37:26 -0500
2733
2734  Proposals by Paul Eggert, in particular the Portugal change that
2735  comes into play at the end of this month.
2736
2737
2738Release data96d - 1996-03-18 20:49:39 -0500
2739
2740  [not summarized]
2741
2742
2743Release code96e - 1996-02-29 15:43:27 -0000
2744  [tzcode96e.tar.gz is missing!]
2745
2746  internationalization changes and the fix to the documentation for strftime
2747
2748
2749Release code96d-data96c - 1996-02-12 11:05:27 -0500
2750
2751  The "code" file simply updates Bob Kridle's electronic address.
2752
2753  The "data" file updates rules for Mexico.
2754
2755
2756Release data96b - 1996-01-27 15:44:42 -0500
2757
2758  Kiribati change
2759
2760
2761Release code96c - 1996-01-16 16:58:15 -0500
2762
2763  leap-year streamlining and binary-search changes
2764
2765  fix to newctime.3
2766
2767
2768Release code96b - 1996-01-10 20:42:39 -0500
2769
2770  fixes and enhancements from Paul Eggert, including code that
2771  emulates the behavior of recent versions of the SunOS "date"
2772  command.
2773
2774
2775Release 96a - 1996-01-06 09:08:24 -0500
2776
2777  Israel updates
2778
2779  fixes to strftime.c for correct ISO 8601 week number generation,
2780  plus support for two new formats ('G' and 'g') to give ISO 8601 year
2781  numbers (which are not necessarily the same as calendar year numbers)
2782
2783
2784Release code95i-data95m - 1995-12-21 12:46:47 -0500
2785
2786  The latest revisions from Paul Eggert are included, the usno1995
2787  file has been updated, and a new file ("WWW") covering useful URLs
2788  has been added.
2789
2790
2791Release code95h-data95l - 1995-12-19 18:10:12 -0500
2792
2793  A simplification of a macro definition, a change to data for Sudan,
2794  and (for last minute shoppers) notes in the "Music" file on the CD
2795  "Old Man Time".
2796
2797
2798Release code95g-data95k - 1995-10-30 10:32:47 -0500
2799
2800  (slightly reformatted) 8-bit-clean proposed patch
2801
2802  minor patch: US/Eastern -> America/New_York
2803
2804  snapshot of the USNO's latest data ("usno1995")
2805
2806  some other minor cleanups
2807
2808
2809Release code95f-data95j - 1995-10-28 21:01:34 -0000
2810  [tzcode95f.tar.gz + tzdata95j.tar.gz are both missing!]
2811
2812  European cleanups
2813
2814  support for 64-bit time_t's
2815
2816  optimization in localtime.c
2817
2818
2819Release code95e - 1995-10-13 13:23:57 -0400
2820
2821  the mktime change to scan from future to past when trying to find time zone
2822  offsets
2823
2824
2825Release data95i - 1995-09-26 10:43:26 -0400
2826
2827  For Canada/Central, guess that the Sun customer's "one week too
2828  early" was just a approximation, and the true error is one month
2829  too early.  This is consistent with the rest of Canada.
2830
2831
2832Release data95h - 1995-09-21 11:26:48 -0400
2833
2834  latest changes from Paul Eggert
2835
2836
2837Release code95d - 1995-09-14 11:14:45 -0400
2838
2839  the addition of a "Music" file, which documents four recorded
2840  versions of the tune "Save That Time".
2841
2842
2843Release data95g - 1995-09-01 17:21:36 -0400
2844
2845  "yearistype" correction
2846
2847
2848Release data95f - 1995-08-28 20:46:56 -0400
2849
2850  Paul Eggert's change to the australasia file
2851
2852
2853Release data95e - 1995-07-08 18:02:34 -0400
2854
2855  The only change is a leap second at the end of this year.
2856  Thanks to Bradley White for forwarding news on the leap second.
2857
2858
2859Release data95d - 1995-07-03 13:26:22 -0400
2860
2861  Paul Eggert's changes
2862
2863
2864Release data95c - 1995-07-02 19:19:28 -0400
2865
2866  changes to "asia", "backward", "europe", and "southamerica"
2867  (read: northamericacentrics need not apply)
2868
2869
2870Release code95c - 1995-03-13 14:00:46 -0500
2871
2872  one-line fix for sign extension problems in detzcode
2873
2874
2875Release 95b - 1995-03-04 11:22:38 -0500
2876
2877  Minor changes in both:
2878
2879  The "code" file contains a workaround for the lack of "unistd.h" in
2880  Microsoft C++ version 7.
2881
2882  The "data" file contains a fixed "Link" for America/Shiprock.
2883
2884
2885Release 94h - 1994-12-10 12:51:14 -0500
2886
2887  The files:
2888
2889  *	incorporate the changes to "zdump" and "date" to make changes to
2890	the "TZ" environment variable permanent;
2891
2892  *	incorporate the table changes by Paul Eggert;
2893
2894  *	include (and document) support for universal time specifications in
2895	data files - but do not (yet) include use of this feature in the
2896	data files.
2897
2898  Think of this as "TZ Classic" - the software has been set up not to break if
2899  universal time shows up in its input, and data entries have been
2900  left as is so as not to break existing implementations.
2901
2902
2903Release data94f - 1994-08-20 12:56:09 -0400
2904
2905  (with thanks!) the latest data updates from Paul Eggert
2906
2907
2908Release data94e - 1994-06-04 13:13:53 -0400
2909
2910  [not summarized]
2911
2912
2913Release code94g - 1994-05-05 12:14:07 -0400
2914
2915  fix missing "optind.c" and a reference to it in the Makefile
2916
2917
2918Release code94f - 1994-05-05 13:00:33 -0000
2919  [tzcode94f.tar.gz is missing!]
2920
2921  changes to avoid overflow in difftime, as well as changes to cope
2922  with the 52/53 challenge in strftime
2923
2924
2925Release code94e - 1994-03-30 23:32:59 -0500
2926
2927  change for the benefit of PCTS
2928
2929
2930Release 94d - 1994-02-24 15:42:25 -0500
2931
2932  Avoid clashes with POSIX semantics for zones such as GMT+4.
2933
2934  Some other very minor housekeeping is also present.
2935
2936
2937Release code94c - 1994-02-10 08:52:40 -0500
2938
2939  Fix bug where mkdirs was broken unless you compile with
2940  -fwritable-strings (which is generally losing to do).
2941
2942
2943Release 94b - 1994-02-07 10:04:33 -0500
2944
2945  work by Paul Eggert who notes:
2946
2947  I found another book of time zone histories by E W Whitman; it's not
2948  as extensive as Shanks but has a few goodies of its own.  I used it
2949  to update the tables.  I also fixed some more as a result of
2950  correspondence with Adam David and Peter Ilieve, and move some stray
2951  links from 'europe' to 'backward'.  I corrected some scanning errors
2952  in usno1989.
2953
2954  As far as the code goes, I fixed zic to allow years in the range
2955  INT_MIN to INT_MAX; this fixed a few boundary conditions around 1900.
2956  And I cleaned up the zic documentation a little bit.
2957
2958
2959Release data94a - 1994-02-03 08:58:54 -0500
2960
2961  It simply incorporates the recently announced leap second into the
2962  "leapseconds" file.
2963
2964
2965Release 93g - 1993-11-22 17:28:27 -0500
2966
2967  Paul Eggert has provided a good deal of historic information (based
2968  on Shanks), and there are some code changes to deal with the buglets
2969  that crawled out in dealing with the new information.
2970
2971
2972Release 93f - 1993-10-15 12:27:46 -0400
2973
2974  Paul Eggert's changes
2975
2976
2977Release 93e - 1993-09-05 21:21:44 -0400
2978
2979  This has updated data for Israel, England, and Kwajalein.  There's
2980  also an update to "zdump" to cope with Kwajalein's 24-hour jump.
2981  Thanks to Paul Eggert and Peter Ilieve for the changes.
2982
2983
2984Release 93d - 1993-06-17 23:34:17 -0400
2985
2986  new fix and new data on Israel
2987
2988
2989Release 93c - 1993-06-06 19:31:55 -0400
2990
2991  [not summarized]
2992
2993
2994Release 93b - 1993-02-02 14:53:58 -0500
2995
2996  updated "leapseconds" file
2997
2998
2999Release 93 - 1993-01-08 07:01:06 -0500
3000
3001  At kre's suggestion, the package has been split in two - a code piece
3002  (which also includes documentation) that's only of use to folks who
3003  want to recompile things and a data piece useful to anyone who can
3004  run "zic".
3005
3006  The new version has a few changes to the data files, a few
3007  portability changes, and an off-by-one fix (with thanks to
3008  Tom Karzes at deshaw.com for providing a description and a
3009  solution).
3010
3011
3012Release 92c - 1992-11-21 17:35:36 -0000
3013  [tz92c.tar.Z is missing!]
3014
3015  The fallout from the latest round of DST transitions.
3016
3017  There are changes for Portugal, Saskatchewan, and "Pacific-New";
3018  there's also a change to "zic.c" that makes it portable to more systems.
3019
3020
3021Release 92 - 1992-04-25 18:17:03 -0000
3022  [tz92.tar.Z is missing!]
3023
3024  By popular demand (well, at any rate, following a request by kre at munnari)
3025
3026
3027The 1989 update of the time zone package featured:
3028
3029  *	POSIXization (including interpretation of POSIX-style TZ environment
3030	variables, provided by Guy Harris),
3031  *	ANSIfication (including versions of "mktime" and "difftime"),
3032  *	SVIDulation (an "altzone" variable)
3033  *	MACHination (the "gtime" function)
3034  *	corrections to some time zone data (including corrections to the rules
3035	for Great Britain and New Zealand)
3036  *	reference data from the United States Naval Observatory for folks who
3037	want to do additional time zones
3038  *	and the 1989 data for Saudi Arabia.
3039
3040  (Since this code will be treated as "part of the implementation" in some
3041  places and as "part of the application" in others, there's no good way to
3042  name functions, such as timegm, that are not part of the proposed ANSI C
3043  standard; such functions have kept their old, underscore-free names in this
3044  update.)
3045
3046  And the "dysize" function has disappeared; it was present to allow
3047  compilation of the "date" command on old BSD systems, and a version of "date"
3048  is now provided in the package.  The "date" command is not created when you
3049  "make all" since it may lack options provided by the version distributed with
3050  your operating system, or may not interact with the system in the same way
3051  the native version does.
3052
3053  Since POSIX frowns on correct leap second handling, the default behavior of
3054  the "zic" command (in the absence of a "-L" option) has been changed to omit
3055  leap second information from its output files.
3056
3057
3058-----
3059Notes
3060
3061This file contains copies of the part of each release announcement
3062that talks about the changes in that release.  The text has been
3063adapted and reformatted for the purposes of this file.
3064
3065Typically a release R consists of a pair of tarball files,
3066tzcodeR.tar.gz and tzdataR.tar.gz.  However, some releases (e.g.,
3067code2010a, data2012c) consist of just one or the other tarball, and a
3068few (e.g., code2012c-data2012d) have tarballs with mixed version
3069numbers.
3070
3071Release time stamps are taken from the release's commit (for newer,
3072git releases), from the newest file in the tarball (for older
3073releases, where this info is available) or from the email announcing
3074the release (if all else fails; these are marked with a time zone of
3075-0000 and an "is missing!" comment).
3076
3077Earlier versions of the code and data were not announced on the tz
3078list and are not summarized here.
3079
3080This file is in the public domain.
3081
3082Local Variables:
3083coding: utf-8
3084End:
3085