NEWS revision 1.45
1 News for the tz database 2 3 Release 2024b - 2024-09-04 12:27:47 -0700 4 5 Briefly: 6 Improve historical data for Mexico, Mongolia, and Portugal. 7 System V names are now obsolescent. 8 The main data form now uses %z. 9 The code now conforms to RFC 8536 for early timestamps. 10 Support POSIX.1-2024, which removes asctime_r and ctime_r. 11 Assume POSIX.2-1992 or later for shell scripts. 12 SUPPORT_C89 now defaults to 1. 13 14 Changes to past timestamps 15 16 Asia/Choibalsan is now an alias for Asia/Ulaanbaatar rather than 17 being a separate Zone with differing behavior before April 2008. 18 This seems better given our wildly conflicting information about 19 Mongolia's time zone history. (Thanks to Heitor David Pinto.) 20 21 Historical transitions for Mexico have been updated based on 22 official Mexican decrees. The affected timestamps occur during 23 the years 1921-1927, 1931, 1945, 1949-1970, and 1981-1997. 24 The affected zones are America/Bahia_Banderas, America/Cancun, 25 America/Chihuahua, America/Ciudad_Juarez, America/Hermosillo, 26 America/Mazatlan, America/Merida, America/Mexico_City, 27 America/Monterrey, America/Ojinaga, and America/Tijuana. 28 (Thanks to Heitor David Pinto.) 29 30 Historical transitions for Portugal, represented by Europe/Lisbon, 31 Atlantic/Azores, and Atlantic/Madeira, have been updated based on a 32 close reading of old Portuguese legislation, replacing previous data 33 mainly originating from Whitman and Shanks & Pottenger. These 34 changes affect a few transitions in 1917-1921, 1924, and 1940 35 throughout these regions by a few hours or days, and various 36 timestamps between 1977 and 1993 depending on the region. In 37 particular, the Azores and Madeira did not observe DST from 1977 to 38 1981. Additionally, the adoption of standard zonal time in former 39 Portuguese colonies have been adjusted: Africa/Maputo in 1909, and 40 Asia/Dili by 22 minutes at the start of 1912. 41 (Thanks to Tim Parenti.) 42 43 Changes to past tm_isdst flags 44 45 The period from 1966-04-03 through 1966-10-02 in Portugal is now 46 modeled as DST, to more closely reflect how contemporaneous changes 47 in law entered into force. 48 49 Changes to data 50 51 Names present only for compatibility with UNIX System V 52 (last released in the 1990s) have been moved to 'backward'. 53 These names, which for post-1970 timestamps mostly just duplicate 54 data of geographical names, were confusing downstream uses. 55 Names moved to 'backward' are now links to geographical names. 56 This affects behavior for TZ='EET' for some pre-1981 timestamps, 57 for TZ='CET' for some pre-1947 timestamps, and for TZ='WET' for 58 some pre-1996 timestamps. Also, TZ='MET' now behaves like 59 TZ='CET' and so uses the abbreviation "CET" rather than "MET". 60 Those needing the previous TZDB behavior, which does not match any 61 real-world clocks, can find the old entries in 'backzone'. 62 (Problem reported by Justin Grant.) 63 64 The main source files' time zone abbreviations now use %z, 65 supported by zic since release 2015f and used in vanguard form 66 since release 2022b. For example, America/Sao_Paulo now contains 67 the zone continuation line "-3:00 Brazil %z", which is less error 68 prone than the old "-3:00 Brazil -03/-02". This does not change 69 the represented data: the generated TZif files are unchanged. 70 Rearguard form still avoids %z, to support obsolescent parsers. 71 72 Asia/Almaty has been removed from zonenow.tab as it now agrees 73 with Asia/Tashkent for future timestamps, due to Kazakhstan's 74 2024-02-29 time zone change. Similarly, America/Scoresbysund 75 has been removed, as it now agrees with America/Nuuk due to 76 its 2024-03-31 time zone change. 77 78 Changes to code 79 80 localtime.c now always uses a TZif file's time type 0 to handle 81 timestamps before the file's first transition. Formerly, 82 localtime.c sometimes inferred a different time type, in order to 83 handle problematic data generated by zic 2018e or earlier. As it 84 is now safe to assume more recent versions of zic, there is no 85 longer a pressing need to fail to conform RFC 8536 section 3.2, 86 which requires using time type 0 in this situation. This change 87 does not affect behavior when reading TZif files generated by zic 88 2018f and later. 89 90 POSIX.1-2024 removes asctime_r and ctime_r and does not let 91 libraries define them, so remove them except when needed to 92 conform to earlier POSIX. These functions are dangerous as they 93 can overrun user buffers. If you still need them, add 94 -DSUPPORT_POSIX2008 to CFLAGS. 95 96 The SUPPORT_C89 option now defaults to 1 instead of 0, fixing a 97 POSIX-conformance bug introduced in 2023a. 98 99 tzselect now supports POSIX.1-2024 proleptic TZ strings. Also, it 100 assumes POSIX.2-1992 or later, as practical porting targets now 101 all support that, and it uses some features from POSIX.1-2024 if 102 available. 103 104 Changes to build procedure 105 106 'make check' no longer requires curl and Internet access. 107 108 The build procedure now assumes POSIX.2-1992 or later, to simplify 109 maintenance. To build on Solaris 10, the only extant system still 110 defaulting to pre-POSIX, prepend /usr/xpg4/bin to PATH. 111 112 Changes to documentation 113 114 The documentation now reflects POSIX.1-2024. 115 116 Changes to commentary 117 118 Commentary about historical transitions in Portugal and her former 119 colonies has been expanded with links to many relevant legislation. 120 (Thanks to Tim Parenti.) 121 122 123 Release 2024a - 2024-02-01 09:28:56 -0800 124 125 Briefly: 126 Kazakhstan unifies on UTC+5 beginning 2024-03-01. 127 Palestine springs forward a week later after Ramadan. 128 zic no longer pretends to support indefinite-past DST. 129 localtime no longer mishandles Ciudad Jurez in 2422. 130 131 Changes to future timestamps 132 133 Kazakhstan unifies on UTC+5. This affects Asia/Almaty and 134 Asia/Qostanay which together represent the eastern portion of the 135 country that will transition from UTC+6 on 2024-03-01 at 00:00 to 136 join the western portion. (Thanks to Zhanbolat Raimbekov.) 137 138 Palestine springs forward a week later than previously predicted 139 in 2024 and 2025. (Thanks to Heba Hamad.) Change spring-forward 140 predictions to the second Saturday after Ramadan, not the first; 141 this also affects other predictions starting in 2039. 142 143 Changes to past timestamps 144 145 Asia/Ho_Chi_Minh's 1955-07-01 transition occurred at 01:00 146 not 00:00. (Thanks to on Trn Cng Danh.) 147 148 From 1947 through 1949, Toronto's transitions occurred at 02:00 149 not 00:00. (Thanks to Chris Walton.) 150 151 In 1911 Miquelon adopted standard time on June 15, not May 15. 152 153 Changes to code 154 155 The FROM and TO columns of Rule lines can no longer be "minimum" 156 or an abbreviation of "minimum", because TZif files do not support 157 DST rules that extend into the indefinite past - although these 158 rules were supported when TZif files had only 32-bit data, this 159 stopped working when 64-bit TZif files were introduced in 1995. 160 This should not be a problem for realistic data, since DST was 161 first used in the 20th century. As a transition aid, FROM columns 162 like "minimum" are now diagnosed and then treated as if they were 163 the year 1900; this should suffice for TZif files on old systems 164 with only 32-bit time_t, and it is more compatible with bugs in 165 2023c-and-earlier localtime.c. (Problem reported by Yoshito 166 Umaoka.) 167 168 localtime and related functions no longer mishandle some 169 timestamps that occur about 400 years after a switch to a time 170 zone with a DST schedule. In 2023d data this problem was visible 171 for some timestamps in November 2422, November 2822, etc. in 172 America/Ciudad_Juarez. (Problem reported by Gilmore Davidson.) 173 174 strftime %s now uses tm_gmtoff if available. (Problem and draft 175 patch reported by Dag-Erling Smrgrav.) 176 177 Changes to build procedure 178 179 The leap-seconds.list file is now copied from the IERS instead of 180 from its downstream counterpart at NIST, as the IERS version is 181 now in the public domain too and tends to be more up-to-date. 182 (Thanks to Martin Burnicki for liaisoning with the IERS.) 183 184 Changes to documentation 185 186 The strftime man page documents which struct tm members affect 187 which conversion specs, and that tzset is called. (Problems 188 reported by Robert Elz and Steve Summit.) 189 190 191 Release 2023d - 2023-12-21 20:02:24 -0800 192 193 Briefly: 194 Ittoqqortoormiit, Greenland changes time zones on 2024-03-31. 195 Vostok, Antarctica changed time zones on 2023-12-18. 196 Casey, Antarctica changed time zones five times since 2020. 197 Code and data fixes for Palestine timestamps starting in 2072. 198 A new data file zonenow.tab for timestamps starting now. 199 200 Changes to future timestamps 201 202 Ittoqqortoormiit, Greenland (America/Scoresbysund) joins most of 203 the rest of Greenland's timekeeping practice on 2024-03-31, by 204 changing its time zone from -01/+00 to -02/-01 at the same moment 205 as the spring-forward transition. Its clocks will therefore not 206 spring forward as previously scheduled. The time zone change 207 reverts to its common practice before 1981. 208 209 Fix predictions for DST transitions in Palestine in 2072-2075, 210 correcting a typo introduced in 2023a. 211 212 Changes to past and future timestamps 213 214 Vostok, Antarctica changed to +05 on 2023-12-18. It had been at 215 +07 (not +06) for years. (Thanks to Zakhary V. Akulov.) 216 217 Change data for Casey, Antarctica to agree with timeanddate.com, 218 by adding five time zone changes since 2020. Casey is now at +08 219 instead of +11. 220 221 Changes to past tm_isdst flags 222 223 Much of Greenland, represented by America/Nuuk, changed its 224 standard time from -03 to -02 on 2023-03-25, not on 2023-10-28. 225 This does not affect UTC offsets, only the tm_isdst flag. 226 (Thanks to Thomas M. Steenholdt.) 227 228 New data file 229 230 A new data file zonenow.tab helps configure applications that use 231 timestamps dated from now on. This simplifies configuration, 232 since users choose from a smaller Zone set. The file's format is 233 experimental and subject to change. 234 235 Changes to code 236 237 localtime.c no longer mishandles TZif files that contain a single 238 transition into a DST regime. Previously, it incorrectly assumed 239 DST was in effect before the transition too. (Thanks to Alois 240 Treindl for debugging help.) 241 242 localtime.c's timeoff no longer collides with OpenBSD 7.4. 243 244 The C code now uses _Generic only if __STDC_VERSION__ says the 245 compiler is C11 or later. 246 247 tzselect now optionally reads zonenow.tab, to simplify when 248 configuring only for timestamps dated from now on. 249 250 tzselect no longer creates temporary files. 251 252 tzselect no longer mishandles the following: 253 254 Spaces and most other special characters in BUGEMAIL, PACKAGE, 255 TZDIR, and VERSION. 256 257 TZ strings when using mawk 1.4.3, which mishandles regular 258 expressions of the form /X{2,}/. 259 260 ISO 6709 coordinates when using an awk that lacks the GNU 261 extension of newlines in -v option-arguments. 262 263 Non UTF-8 locales when using an iconv command that lacks the GNU 264 //TRANSLIT extension. 265 266 zic no longer mishandles data for Palestine after the year 2075. 267 Previously, it incorrectly omitted post-2075 transitions that are 268 predicted for just before and just after Ramadan. (Thanks to Ken 269 Murchison for debugging help.) 270 271 zic now works again on Linux 2.6.16 and 2.6.17 (2006). 272 (Problem reported by Rune Torgersen.) 273 274 Changes to build procedure 275 276 The Makefile is now more compatible with POSIX: 277 * It no longer defines AR, CC, CFLAGS, LDFLAGS, and SHELL. 278 * It no longer uses its own 'cc' in place of CC. 279 * It now uses ARFLAGS, with default specified by POSIX. 280 * It does not use LFLAGS incompatibly with POSIX. 281 * It uses the special .POSIX target. 282 * It quotes special characters more carefully. 283 * It no longer mishandles builds in an ISO 8859 locale. 284 Due to the CC changes, TZDIR is now #defined in a file tzdir.h 285 built by 'make', not in a $(CC) -D option. Also, TZDEFAULT is 286 now treated like TZDIR as they have similar roles. 287 288 Changes to commentary 289 290 Limitations and hazards of the optional support for obsolescent 291 C89 platforms are documented better, along with a tentative 292 schedule for removing this support. 293 294 295 Release 2023c - 2023-03-28 12:42:14 -0700 296 297 Changes to past and future timestamps 298 299 Model Lebanon's DST chaos by reverting data to tzdb 2023a. 300 (Thanks to Rany Hany for the heads-up.) 301 302 303 Release 2023b - 2023-03-23 19:50:38 -0700 304 305 Changes to future timestamps 306 307 This year Lebanon springs forward April 20/21 not March 25/26. 308 (Thanks to Saadallah Itani.) [This was reverted in 2023c.] 309 310 311 Release 2023a - 2023-03-22 12:39:33 -0700 312 313 Briefly: 314 Egypt now uses DST again, from April through October. 315 This year Morocco springs forward April 23, not April 30. 316 Palestine delays the start of DST this year. 317 Much of Greenland still uses DST from 2024 on. 318 America/Yellowknife now links to America/Edmonton. 319 tzselect can now use current time to help infer timezone. 320 The code now defaults to C99 or later. 321 Fix use of C23 attributes. 322 323 Changes to future timestamps 324 325 Starting in 2023, Egypt will observe DST from April's last Friday 326 through October's last Thursday. (Thanks to Ahmad ElDardiry.) 327 Assume the transition times are 00:00 and 24:00, respectively. 328 329 In 2023 Morocco's spring-forward transition after Ramadan 330 will occur April 23, not April 30. (Thanks to Milamber.) 331 Adjust predictions for future years accordingly. This affects 332 predictions for 2023, 2031, 2038, and later years. 333 334 This year Palestine will delay its spring forward from 335 March 25 to April 29 due to Ramadan. (Thanks to Heba Hamad.) 336 Make guesses for future Ramadans too. 337 338 Much of Greenland, represented by America/Nuuk, will continue to 339 observe DST using European Union rules. When combined with 340 Greenland's decision not to change the clocks in fall 2023, 341 America/Nuuk therefore changes from -03/-02 to -02/-01 effective 342 2023-10-29 at 01:00 UTC. (Thanks to Thomas M. Steenholdt.) 343 This change from 2022g doesn't affect timestamps until 2024-03-30, 344 and doesn't affect tm_isdst until 2023-03-25. 345 346 Changes to past timestamps 347 348 America/Yellowknife has changed from a Zone to a backward 349 compatibility Link, as it no longer differs from America/Edmonton 350 since 1970. (Thanks to Almaz Mingaleev.) This affects some 351 pre-1948 timestamps. The old data are now in 'backzone'. 352 353 Changes to past time zone abbreviations 354 355 When observing Moscow time, Europe/Kirov and Europe/Volgograd now 356 use the abbreviations MSK/MSD instead of numeric abbreviations, 357 for consistency with other timezones observing Moscow time. 358 359 Changes to code 360 361 You can now tell tzselect local time, to simplify later choices. 362 Select the 'time' option in its first prompt. 363 364 You can now compile with -DTZNAME_MAXIMUM=N to limit time zone 365 abbreviations to N bytes (default 255). The reference runtime 366 library now rejects POSIX-style TZ strings that contain longer 367 abbreviations, treating them as UTC. Previously the limit was 368 platform dependent and abbreviations were silently truncated to 369 16 bytes even when the limit was greater than 16. 370 371 The code by default is now designed for C99 or later. To build on 372 a mostly-C89 platform, compile with -DPORT_TO_C89; this should 373 work on C89 platforms that also support C99 'long long' and 374 perhaps a few other extensions to C89. To support C89 callers of 375 tzcode's library, compile with -DSUPPORT_C89; however, this could 376 trigger latent bugs in C99-or-later callers. The two new macros 377 are transitional aids planned to be removed in a future version 378 (say, in 2029), when C99 or later will be required. 379 380 The code now builds again on pre-C99 platforms, if you compile 381 with -DPORT_TO_C89. This fixes a bug introduced in 2022f. 382 383 On C23-compatible platforms tzcode no longer uses syntax like 384 'static [[noreturn]] void usage(void);'. Instead, it uses 385 '[[noreturn]] static void usage(void);' as strict C23 requires. 386 (Problem reported by Houge Langley.) 387 388 The code's functions now constrain their arguments with the C 389 'restrict' keyword consistently with their documentation. 390 This may allow future optimizations. 391 392 zdump again builds standalone with ckdadd and without setenv, 393 fixing a bug introduced in 2022g. (Problem reported by panic.) 394 395 leapseconds.awk can now process a leap seconds file that never 396 expires; this might be useful if leap seconds are discontinued. 397 398 Changes to commentary 399 400 tz-link.html has a new section "Coordinating with governments and 401 distributors". (Thanks to Neil Fuller for some of the text.) 402 403 To improve tzselect diagnostics, zone1970.tab's comments column is 404 now limited to countries that have multiple timezones. 405 406 Note that there are plans to discontinue leap seconds by 2035. 407 408 409 Release 2022g - 2022-11-29 08:58:31 -0800 410 411 Briefly: 412 The northern edge of Chihuahua changes to US timekeeping. 413 Much of Greenland stops changing clocks after March 2023. 414 Fix some pre-1996 timestamps in northern Canada. 415 C89 is now deprecated; please use C99 or later. 416 Portability fixes for AIX, libintl, MS-Windows, musl, z/OS 417 In C code, use more C23 features if available. 418 C23 timegm now supported by default 419 Fixes for unlikely integer overflows 420 421 Changes to future timestamps 422 423 In the Mexican state of Chihuahua, the border strip near the US 424 will change to agree with nearby US locations on 2022-11-30. 425 The strip's western part, represented by Ciudad Jurez, switches 426 from -06 all year to -07/-06 with US DST rules, like El Paso, TX. 427 The eastern part, represented by Ojinaga, will observe US DST next 428 year, like Presidio, TX. (Thanks to Heitor David Pinto.) 429 A new Zone America/Ciudad_Juarez splits from America/Ojinaga. 430 431 Much of Greenland, represented by America/Nuuk, stops observing 432 winter time after March 2023, so its daylight saving time becomes 433 standard time. (Thanks to Jonas Nyrup and Jrgen Appel.) 434 435 Changes to past timestamps 436 437 Changes for pre-1996 northern Canada (thanks to Chris Walton): 438 439 Merge America/Iqaluit and America/Pangnirtung into the former, 440 with a backward compatibility link for the latter name. 441 There is no good evidence the two locations differ since 1970. 442 This change affects pre-1996 America/Pangnirtung timestamps. 443 444 Cambridge Bay, Inuvik, Iqaluit, Rankin Inlet, Resolute and 445 Yellowknife did not observe DST in 1965, and did observe DST 446 from 1972 through 1979. 447 448 Whitehorse moved from -09 to -08 on 1966-02-27, not 1967-05-28. 449 450 Colombia's 1993 fallback was 02-06 24:00, not 04-04 00:00. 451 (Thanks to Alois Treindl.) 452 453 Singapore's 1981-12-31 change was at 16:00 UTC (23:30 local time), 454 not 24:00 local time. (Thanks to Geoff Clare via Robert Elz.) 455 456 Changes to code 457 458 Although tzcode still works with C89, bugs found in recent routine 459 maintenance indicate that bitrot has set in and that in practice 460 C89 is no longer used to build tzcode. As it is a maintenance 461 burden, support for C89 is planned to be removed soon. Instead, 462 please use compilers compatible with C99, C11, C17, or C23. 463 464 timegm, which tzcode implemented in 1989, will finally be 465 standardized 34 years later as part of C23, so timegm is now 466 supported even if STD_INSPIRED is not defined. 467 468 Fix bug in zdump's tzalloc emulation on hosts that lack tm_zone. 469 (Problem reported by on Trn Cng Danh.) 470 471 Fix bug in zic on hosts where malloc(0) yields NULL on success. 472 (Problem reported by Tim McBrayer for AIX 6.1.) 473 474 Fix zic configuration to avoid linkage failures on some platforms. 475 (Problems reported by Gilmore Davidson and Igor Ivanov.) 476 477 Work around MS-Windows nmake incompatibility with POSIX. 478 (Problem reported by Manuela Friedrich.) 479 480 Port mktime and strftime to debugging platforms where accessing 481 uninitialized data has undefined behavior (strftime problem 482 reported by Robert Elz). 483 484 Check more carefully for unlikely integer overflows, preferring 485 C23 <stdckdint.h> to overflow checking by hand, as the latter has 486 had obscure bugs. 487 488 Changes to build procedure 489 490 New Makefile rule check_mild that skips checking whether Link 491 lines are in the file 'backward'. (Inspired by a suggestion from 492 Stephen Colebourne.) 493 494 On C23-compatible platforms tzcode no longer uses syntax like 495 'static [[noreturn]] void usage(void);'. Instead, it uses 496 '[[noreturn]] static void usage(void);' as strict C23 requires. 497 (Problem reported by Houge Langley.) 498 499 500 Release 2022f - 2022-10-28 18:04:57 -0700 501 502 Briefly: 503 Mexico will no longer observe DST except near the US border. 504 Chihuahua moves to year-round -06 on 2022-10-30. 505 Fiji no longer observes DST. 506 Move links to 'backward'. 507 In vanguard form, GMT is now a Zone and Etc/GMT a link. 508 zic now supports links to links, and vanguard form uses this. 509 Simplify four Ontario zones. 510 Fix a Y2438 bug when reading TZif data. 511 Enable 64-bit time_t on 32-bit glibc platforms. 512 Omit large-file support when no longer needed. 513 In C code, use some C23 features if available. 514 Remove no-longer-needed workaround for Qt bug 53071. 515 516 Changes to future timestamps 517 518 Mexico will no longer observe DST after 2022, except for areas 519 near the US border that continue to observe US DST rules. 520 On 2022-10-30 at 02:00 the Mexican state of Chihuahua moves 521 from -07 (-06 with DST) to year-round -06, thus not changing 522 its clocks that day. The new law states that Chihuahua 523 near the US border no longer observes US DST. 524 (Thanks to gera for the heads-up about Chihuahua.) 525 526 Fiji will not observe DST in 2022/3. (Thanks to Shalvin Narayan.) 527 For now, assume DST is suspended indefinitely. 528 529 Changes to data 530 531 Move links to 'backward' to ease and simplify link maintenance. 532 This affects generated data only if you use 'make BACKWARD='. 533 534 GMT is now a Zone and Etc/GMT a link instead of vice versa, 535 as GMT is needed for leap second support whereas Etc/GMT is not. 536 However, this change exposes a bug in TZUpdater 2.3.2 so it is 537 present only in vanguard form for now. 538 539 Vanguard form now uses links to links, as zic now supports this. 540 541 Changes to past timestamps 542 543 Simplify four Ontario zones, as most of the post-1970 differences 544 seem to have been imaginary. (Problem reported by Chris Walton.) 545 Move America/Nipigon, America/Rainy_River, and America/Thunder_Bay 546 to 'backzone'; backward-compatibility links still work, albeit 547 with some different timestamps before November 2005. 548 549 Changes to code 550 551 zic now supports links to links regardless of input line order. 552 For example, if Australia/Sydney is a Zone, the lines 553 Link Australia/Canberra Australia/ACT 554 Link Australia/Sydney Australia/Canberra 555 now work correctly, even though the shell commands 556 ln Australia/Canberra Australia/ACT 557 ln Australia/Sydney Australia/Canberra 558 would fail because the first command attempts to use a link 559 Australia/Canberra that does not exist until after the second 560 command is executed. Previously, zic had unspecified behavior if 561 a Link line's target was another link, and zic often misbehaved if 562 a Link line's target was a later Link line. 563 564 Fix line number in zic's diagnostic for a link to a link. 565 566 Fix a bug that caused localtime to mishandle timestamps starting 567 in the year 2438 when reading data generated by 'zic -b fat' when 568 distant-future DST transitions occur at times given in standard 569 time or in UT, not the usual case of local time. This occurs when 570 the corresponding .zi Rule lines specify DST transitions with TO 571 columns of 'max' and AT columns that end in 's' or 'u'. The 572 number 2438 comes from the 32-bit limit in the year 2038, plus the 573 400-year Gregorian cycle. (Problem reported by Bradley White.) 574 575 On glibc 2.34 and later, which optionally supports 64-bit time_t 576 on platforms like x86 where time_t was traditionally 32 bits, 577 default time_t to 64 instead of 32 bits. This lets functions like 578 localtime support timestamps after the year 2038, and fixes 579 year-2038 problems in zic when accessing files dated after 2038. 580 To continue to limit time_t to 32 bits on these platforms, use 581 "make CFLAGS='-D_TIME_BITS=32'". 582 583 In C code, do not enable large-file support on platforms like AIX 584 and macOS that no longer need it now that tzcode does not use 585 off_t or related functions like 'stat'. Large-file support is 586 still enabled by default on GNU/Linux, as it is needed for 64-bit 587 time_t support. 588 589 In C code, prefer C23 keywords to pre-C23 macros for alignof, 590 bool, false, and true. Also, use the following C23 features if 591 available: __has_include, unreachable. 592 593 zic no longer works around Qt bug 53071, as the relevant Qt 594 releases have been out of support since 2019. This change affects 595 only fat TZif files, as thin files never had the workaround. 596 597 zdump no longer modifies the environ vector when compiled on 598 platforms lacking tm_zone or when compiled with -DUSE_LTZ=0. 599 This avoid undefined behavior on POSIX platforms. 600 601 602 Release 2022e - 2022-10-11 11:13:02 -0700 603 604 Briefly: 605 Jordan and Syria switch from +02/+03 with DST to year-round +03. 606 607 Changes to future timestamps 608 609 Jordan and Syria are abandoning the DST regime and are changing to 610 permanent +03, so they will not fall back from +03 to +02 on 611 2022-10-28. (Thanks to Steffen Thorsen and Issam Al-Zuwairi.) 612 613 Changes to past timestamps 614 615 On 1922-01-01 Tijuana adopted standard time at 00:00, not 01:00. 616 617 Changes to past time zone abbreviations and DST flags 618 619 The temporary advancement of clocks in central Mexico in summer 620 1931 is now treated as daylight saving time, instead of as two 621 changes to standard time. 622 623 624 Release 2022d - 2022-09-23 12:02:57 -0700 625 626 Briefly: 627 Palestine transitions are now Saturdays at 02:00. 628 Simplify three Ukraine zones into one. 629 630 Changes to future timestamps 631 632 Palestine now springs forward and falls back at 02:00 on the 633 first Saturday on or after March 24 and October 24, respectively. 634 This means 2022 falls back 10-29 at 02:00, not 10-28 at 01:00. 635 (Thanks to Heba Hamad.) 636 637 Changes to past timestamps 638 639 Simplify three Ukraine zones to one, since the post-1970 640 differences seem to have been imaginary. Move Europe/Uzhgorod and 641 Europe/Zaporozhye to 'backzone'; backward-compatibility links 642 still work, albeit with different timestamps before October 1991. 643 644 645 Release 2022c - 2022-08-15 17:47:18 -0700 646 647 Briefly: 648 Work around awk bug in FreeBSD, macOS, etc. 649 Improve tzselect on intercontinental Zones. 650 651 Changes to code 652 653 Work around a bug in onetrueawk that broke commands like 654 'make traditional_tarballs' on FreeBSD, macOS, etc. 655 (Problem reported by Deborah Goldsmith.) 656 657 Add code to tzselect that uses experimental structured comments in 658 zone1970.tab to clarify whether Zones like Africa/Abidjan and 659 Europe/Istanbul cross continent or ocean boundaries. 660 (Inspired by a problem reported by Peter Krefting.) 661 662 Fix bug with 'zic -d /a/b/c' when /a is unwritable but the 663 directory /a/b already exists. 664 665 Remove zoneinfo2tdf.pl, as it was unused and triggered false 666 malware alarms on some email servers. 667 668 669 Release 2022b - 2022-08-10 15:38:32 -0700 670 671 Briefly: 672 Chile's DST is delayed by a week in September 2022. 673 Iran no longer observes DST after 2022. 674 Rename Europe/Kiev to Europe/Kyiv. 675 New zic -R option 676 Vanguard form now uses %z. 677 Finish moving duplicate-since-1970 zones to 'backzone'. 678 New build option PACKRATLIST 679 New tailored_tarballs target, replacing rearguard_tarballs 680 681 Changes to future timestamps 682 683 Chile's 2022 DST start is delayed from September 4 to September 11. 684 (Thanks to Juan Correa.) 685 686 Iran plans to stop observing DST permanently, after it falls back 687 on 2022-09-21. (Thanks to Ali Mirjamali.) 688 689 Changes to past timestamps 690 691 Finish moving to 'backzone' the location-based zones whose 692 timestamps since 1970 are duplicates; adjust links accordingly. 693 This change ordinarily affects only pre-1970 timestamps, and with 694 the new PACKRATLIST option it does not affect any timestamps. 695 In this round the affected zones are Antarctica/Vostok, 696 Asia/Brunei, Asia/Kuala_Lumpur, Atlantic/Reykjavik, 697 Europe/Amsterdam, Europe/Copenhagen, Europe/Luxembourg, 698 Europe/Monaco, Europe/Oslo, Europe/Stockholm, Indian/Christmas, 699 Indian/Cocos, Indian/Kerguelen, Indian/Mahe, Indian/Reunion, 700 Pacific/Chuuk, Pacific/Funafuti, Pacific/Majuro, Pacific/Pohnpei, 701 Pacific/Wake and Pacific/Wallis, and the affected links are 702 Arctic/Longyearbyen, Atlantic/Jan_Mayen, Iceland, Pacific/Ponape, 703 Pacific/Truk, and Pacific/Yap. 704 705 From fall 1994 through fall 1995, Shanks wrote that Crimea's 706 DST transitions were at 02:00 standard time, not at 00:00. 707 (Thanks to Michael Deckers.) 708 709 Iran adopted standard time in 1935, not 1946. In 1977 it observed 710 DST from 03-21 23:00 to 10-20 24:00; its 1978 transitions were on 711 03-24 and 08-05, not 03-20 and 10-20; and its spring 1979 712 transition was on 05-27, not 03-21. 713 (Thanks to Roozbeh Pournader and Francis Santoni.) 714 715 Chile's observance of -04 from 1946-08-29 through 1947-03-31 was 716 considered DST, not standard time. Santiago and environs had moved 717 their clocks back to rejoin the rest of mainland Chile; put this 718 change at the end of 1946-08-28. (Thanks to Michael Deckers.) 719 720 Some old, small clock transitions have been removed, as people at 721 the time did not change their clocks. This affects Asia/Hong_Kong 722 in 1904, Asia/Ho_Chi_Minh in 1906, and Europe/Dublin in 1880. 723 724 Changes to zone name 725 726 Rename Europe/Kiev to Europe/Kyiv, as "Kyiv" is more common in 727 English now. Spelling of other names in Ukraine has not yet 728 demonstrably changed in common English practice so for now these 729 names retain old spellings, as in other countries (e.g., 730 Europe/Prague not "Praha", and Europe/Sofia not "Sofiya"). 731 732 Changes to code 733 734 zic has a new option '-R @N' to output explicit transitions < N. 735 (Need suggested by Almaz Mingaleev.) 736 737 'zic -r @N' no longer outputs bad data when N < first transition. 738 (Problem introduced in 2021d and reported by Peter Krefting.) 739 740 zic now checks its input for NUL bytes and unterminated lines, and 741 now supports input line lengths up to 2048 (not 512) bytes. 742 743 gmtime and related code now use the abbreviation "UTC" not "GMT". 744 POSIX is being revised to require this. 745 746 When tzset and related functions set vestigial static variables 747 like tzname, they now prefer specified timestamps to unspecified ones. 748 (Problem reported by Almaz Mingaleev.) 749 750 zic no longer complains "can't determine time zone abbreviation to 751 use just after until time" when a transition to a new standard 752 time occurs simultaneously with the first DST fallback transition. 753 754 Changes to build procedure 755 756 Source data in vanguard form now uses the %z notation, introduced 757 in release 2015f. For example, for America/Sao_Paulo vanguard 758 form contains the zone continuation line "-3:00 Brazil %z", which 759 is simpler and more reliable than the line "-3:00 Brazil -03/-02" 760 used in main and rearguard forms. The plan is for the main form 761 to use %z eventually; in the meantime maintainers of zi parsers 762 are encouraged to test the parsers on vanguard.zi. 763 764 The Makefile has a new PACKRATLIST option to select a subset of 765 'backzone'. For example, 'make PACKRATDATA=backzone 766 PACKRATLIST=zone.tab' now generates TZif files identical to those 767 of the global-tz project. 768 769 The Makefile has a new tailored_tarballs target for generating 770 special-purpose tarballs. It generalizes and replaces the 771 rearguard_tarballs target and related targets and macros, which 772 are now obsolescent. 773 774 'make install' now defaults LOCALTIME to Factory not GMT, 775 which means the default abbreviation is now "-00" not "GMT". 776 777 Remove the posix_packrat target, marked obsolescent in 2016a. 778 779 780 Release 2022a - 2022-03-15 23:02:01 -0700 781 782 Briefly: 783 Palestine will spring forward on 2022-03-27, not -03-26. 784 zdump -v now outputs better failure indications. 785 Bug fixes for code that reads corrupted TZif data. 786 787 Changes to future timestamps 788 789 Palestine will spring forward on 2022-03-27, not 2022-03-26. 790 (Thanks to Heba Hamad.) Predict future transitions for first 791 Sunday >= March 25. Additionally, predict fallbacks to be the first 792 Friday on or after October 23, not October's last Friday, to be more 793 consistent with recent practice. The first differing fallback 794 prediction is on 2025-10-24, not 2025-10-31. 795 796 Changes to past timestamps 797 798 From 1992 through spring 1996, Ukraine's DST transitions were at 799 02:00 standard time, not at 01:00 UTC. (Thanks to Alois Treindl.) 800 801 Chile's Santiago Mean Time and its LMT precursor have been adjusted 802 eastward by 1 second to align with past and present law. 803 804 Changes to commentary 805 806 Add several references for Chile's 1946/1947 transitions, some of 807 which only affected portions of the country. 808 809 Changes to code 810 811 Fix bug when mktime gets confused by truncated TZif files with 812 unspecified local time. (Problem reported by Almaz Mingaleev.) 813 814 Fix bug when 32-bit time_t code reads malformed 64-bit TZif data. 815 (Problem reported by Christos Zoulas.) 816 817 When reading a version 2 or later TZif file, the TZif reader now 818 validates the version 1 header and data block only enough to skip 819 over them, as recommended by RFC 8536 section 4. Also, the TZif 820 reader no longer mistakenly attempts to parse a version 1 TZIf 821 file header as a TZ string. 822 823 zdump -v now outputs "(localtime failed)" and "(gmtime failed)" 824 when local time and UT cannot be determined for a timestamp. 825 826 Changes to build procedure 827 828 Distribution tarballs now use standard POSIX.1-1988 ustar format 829 instead of GNU format. Although the formats are almost identical 830 for these tarballs, ustar headers' magic fields contain "ustar" 831 instead of "ustar ", and their version fields contain "00" instead 832 of " ". The two formats are planned to diverge more significantly 833 for tzdb releases after 2242-03-16 12:56:31 UTC, when the ustar 834 format becomes obsolete and the tarballs switch to pax format, an 835 extension of ustar. For details about these formats, please see 836 "pax - portable archive interchange", IEEE Std 1003.1-2017, 837 <https://pubs.opengroup.org/onlinepubs/9699919799/utilities/pax.html#tag_20_92_13>. 838 839 840 Release 2021e - 2021-10-21 18:41:00 -0700 841 842 Changes to future timestamps 843 844 Palestine will fall back 10-29 (not 10-30) at 01:00. 845 (Thanks to P Chan and Heba Hemad.) 846 847 848 Release 2021d - 2021-10-15 13:48:18 -0700 849 850 Briefly: 851 Fiji suspends DST for the 2021/2022 season. 852 'zic -r' marks unspecified timestamps with "-00". 853 854 Changes to future timestamps 855 856 Fiji will suspend observance of DST for the 2021/2022 season. 857 Assume for now that it will return next year. (Thanks to Jashneel 858 Kumar and P Chan.) 859 860 Changes to code 861 862 'zic -r' now uses "-00" time zone abbreviations for intervals 863 with UT offsets that are unspecified due to -r truncation. 864 This implements a change in draft Internet RFC 8536bis. 865 866 867 Release 2021c - 2021-10-01 14:21:49 -0700 868 869 Briefly: 870 Revert most 2021b changes to 'backward'. 871 Fix 'zic -b fat' bug in pre-1970 32-bit data. 872 Fix two Link line typos. 873 Distribute SECURITY file. 874 875 This release is intended as a bugfix release, to fix compatibility 876 problems and typos reported since 2021b was released. 877 878 Changes to Link directives 879 880 Revert almost all of 2021b's changes to the 'backward' file, 881 by moving Link directives back to where they were in 2021a. 882 Although 'zic' doesn't care which source file contains a Link 883 directive, some downstream uses ran into trouble with the move. 884 (Problem reported by Stephen Colebourne for Joda-Time.) 885 886 Fix typo that linked Atlantic/Jan_Mayen to the wrong location 887 (problem reported by Chris Walton). 888 889 Fix 'backzone' typo that linked America/Virgin to the wrong 890 location (problem reported by Michael Deckers). 891 892 Changes to code 893 894 Fix a bug in 'zic -b fat' that caused old timestamps to be 895 mishandled in 32-bit-only readers (problem reported by Daniel 896 Fischer). 897 898 Changes to documentation 899 900 Distribute the SECURITY file (problem reported by Andreas Radke). 901 902 903 Release 2021b - 2021-09-24 16:23:00 -0700 904 905 Briefly: 906 Jordan now starts DST on February's last Thursday. 907 Samoa no longer observes DST. 908 Merge more location-based Zones whose timestamps agree since 1970. 909 Move some backward-compatibility links to 'backward'. 910 Rename Pacific/Enderbury to Pacific/Kanton. 911 Correct many pre-1993 transitions in Malawi, Portugal, etc. 912 zic now creates each output file or link atomically. 913 zic -L no longer omits the POSIX TZ string in its output. 914 zic fixes for truncation and leap second table expiration. 915 zic now follows POSIX for TZ strings using all-year DST. 916 Fix some localtime crashes and bugs in obscure cases. 917 zdump -v now outputs more-useful boundary cases. 918 tzfile.5 better matches a draft successor to RFC 8536. 919 A new file SECURITY. 920 921 This release is prompted by recent announcements by Jordan and Samoa. 922 It incorporates many other changes that had accumulated since 2021a. 923 However, it omits most proposed changes that merged all Zones 924 agreeing since 1970, as concerns were raised about doing too many of 925 these changes at once. It does keeps some of these changes in the 926 interest of making tzdb more equitable one step at a time; see 927 "Merge more location-based Zones" below. 928 929 Changes to future timestamps 930 931 Jordan now starts DST on February's last Thursday. 932 (Thanks to Steffen Thorsen.) 933 934 Samoa no longer observes DST. (Thanks to Geoffrey D. Bennett.) 935 936 Changes to zone name 937 938 Rename Pacific/Enderbury to Pacific/Kanton. When we added 939 Enderbury in 1993, we did not know that it is uninhabited and that 940 Kanton (population two dozen) is the only inhabited location in 941 that timezone. The old name is now a backward-compatibility link. 942 943 Changes to past timestamps 944 945 Correct many pre-1993 transitions, fixing entries originally 946 derived from Shanks, Whitman, and Mundell. The fixes include: 947 - Barbados: standard time was introduced in 1911, not 1932; and 948 DST was observed in 1942-1944 949 - Cook Islands: In 1899 they switched from east to west of GMT, 950 celebrating Christmas for two days. They (and Niue) switched 951 to standard time in 1952, not 1901. 952 - Guyana: corrected LMT for Georgetown; the introduction of 953 standard time in 1911, not 1915; and corrections to 1975 and 954 1992 transitions 955 - Kanton: uninhabited before 1937-08-31 956 - Niue: only observed -11:20 from 1952 through 1964, then went to 957 -11 instead of -11:30 958 - Portugal: DST was observed in 1950 959 - Tonga: corrected LMT; the introduction of standard time in 1945, 960 not 1901; and corrections to the transition from +12:20 to +13 961 in 1961, not 1941 962 Additional fixes to entries in the 'backzone' file include: 963 - Enderbury: inhabited only 1860/1885 and 1938-03-06/1942-02-09 964 - The Gambia: 1933 and 1942 transitions 965 - Malawi: several 1911 through 1925 transitions 966 - Sierra Leone: several 1913 through 1941 transitions, and DST 967 was NOT observed in 1957 through 1962 968 (Thanks to P Chan, Michael Deckers, Alexander Krivenyshev and 969 Alois Treindl.) 970 971 Merge more location-based Zones whose timestamps agree since 1970, 972 as pre-1970 timestamps are out of scope. This is part of a 973 process that has been ongoing since 2013. This does not affect 974 post-1970 timestamps, and timezone historians who build with 'make 975 PACKRATDATA=backzone' should see no changes to pre-1970 timestamps. 976 When merging, keep the most-populous location's data, and move 977 data for other locations to 'backzone' with a backward 978 link in 'backward'. For example, move America/Creston data to 979 'backzone' with a link in 'backward' from America/Phoenix because 980 the two timezones' timestamps agree since 1970; this change 981 affects some pre-1968 timestamps in America/Creston because 982 Creston and Phoenix disagreed before 1968. The affected Zones 983 are Africa/Accra, America/Atikokan, America/Blanc-Sablon, 984 America/Creston, America/Curacao, America/Nassau, 985 America/Port_of_Spain, Antarctica/DumontDUrville, and 986 Antarctica/Syowa. 987 988 Changes to maintenance procedure 989 990 The new file SECURITY covers how to report security-related bugs. 991 992 Several backward-compatibility links have been moved to the 993 'backward' file. These links, which range from Africa/Addis_Ababa 994 to Pacific/Saipan, are only for compatibility with now-obsolete 995 guidelines suggesting an entry for every ISO 3166 code. 996 The intercontinental convenience links Asia/Istanbul and 997 Europe/Nicosia have also been moved to 'backward'. 998 999 Changes to code 1000 1001 zic now creates each output file or link atomically, 1002 possibly by creating a temporary file and then renaming it. 1003 This avoids races where a TZ setting would temporarily stop 1004 working while zic was installing a replacement file or link. 1005 1006 zic -L no longer omits the POSIX TZ string in its output. 1007 Starting with 2020a, zic -L truncated its output according to the 1008 "Expires" directive or "#expires" comment in the leapseconds file. 1009 The resulting TZif files omitted daylight saving transitions after 1010 the leap second table expired, which led to far less accurate 1011 predictions of times after the expiry. Although future timestamps 1012 cannot be converted accurately in the presence of leap seconds, it 1013 is more accurate to convert near-future timestamps with a few 1014 seconds error than with an hour error, so zic -L no longer 1015 truncates output in this way. 1016 1017 Instead, when zic -L is given the "Expires" directive, it now 1018 outputs the expiration by appending a no-change entry to the leap 1019 second table. Although this should work well with most TZif 1020 readers, it does not conform to Internet RFC 8536 and some pickier 1021 clients (including tzdb 2017c through 2021a) reject it, so 1022 "Expires" directives are currently disabled by default. To enable 1023 them, set the EXPIRES_LINE Makefile variable. If a TZif file uses 1024 this new feature it is marked with a new TZif version number 4, 1025 a format intended to be documented in a successor to RFC 8536. 1026 The old-format "#expires" comments are now treated solely as 1027 comments and have no effect on the TZif files. 1028 1029 zic -L LEAPFILE -r @LO no longer generates an invalid TZif file 1030 that omits leap second information for the range LO..B when LO 1031 falls between two leap seconds A and B. Instead, it generates a 1032 TZif version 4 file that represents the previously missing 1033 information. 1034 1035 The TZif reader now allows the leap second table to begin with a 1036 correction other than -1 or +1, and to contain adjacent 1037 transitions with equal corrections. This supports TZif version 4. 1038 1039 The TZif reader now lets leap seconds occur less than 28 days 1040 apart. This supports possible future TZif extensions. 1041 1042 Fix bug that caused 'localtime' etc. to crash when TZ was 1043 set to a all-year DST string like "EST5EDT4,0/0,J365/25" that does 1044 not conform to POSIX but does conform to Internet RFC 8536. 1045 1046 Fix another bug that caused 'localtime' etc. to crash when TZ was 1047 set to a POSIX-conforming but unusual TZ string like 1048 "EST5EDT4,0/0,J365/0", where almost all the year is DST. 1049 1050 Fix yet another bug that caused 'localtime' etc. to mishandle slim 1051 TZif files containing leap seconds after the last explicit 1052 transition in the table, or when handling far-future timestamps 1053 in slim TZif files lacking leap seconds. 1054 1055 Fix localtime misbehavior involving positive leap seconds. 1056 This change affects only behavior for "right" system time, 1057 which contains leap seconds, and only if the UT offset is 1058 not a multiple of 60 seconds when a positive leap second occurs. 1059 (No such timezone exists in tzdb, luckily.) Without the fix, 1060 the timestamp was ambiguous during a positive leap second. 1061 With the fix, any seconds occurring after a positive leap second 1062 and within the same localtime minute are counted through 60, not 1063 through 59; their UT offset (tm_gmtoff) is the same as before. 1064 Here is how the fix affects timestamps in a timezone with UT 1065 offset +01:23:45 (5025 seconds) and with a positive leap second at 1066 1972-06-30 23:59:60 UTC (78796800): 1067 1068 time_t without the fix with the fix 1069 78796800 1972-07-01 01:23:45 1972-07-01 01:23:45 (leap second) 1070 78796801 1972-07-01 01:23:45 1972-07-01 01:23:46 1071 ... 1072 78796815 1972-07-01 01:23:59 1972-07-01 01:23:60 1073 78796816 1972-07-01 01:24:00 1972-07-01 01:24:00 1074 1075 Fix an unlikely bug that caused 'localtime' etc. to misbehave if 1076 civil time changes a few seconds before time_t wraps around, when 1077 leap seconds are enabled. 1078 1079 Fix bug in zic -r; in some cases, the dummy time type after the 1080 last time transition disagreed with the TZ string, contrary to 1081 Internet RFC 8563 section 3.3. 1082 1083 Fix a bug with 'zic -r @X' when X is a negative leap second that 1084 has a nonnegative correction. Without the fix, the output file 1085 was truncated so that X appeared to be a positive leap second. 1086 Fix a similar, even less likely bug when truncating at a positive 1087 leap second that has a nonpositive correction. 1088 1089 zic -r now reports an error if given rolling leap seconds, as this 1090 usage has never generally worked and is evidently unused. 1091 1092 zic now generates a POSIX-conforming TZ string for TZif files 1093 where all-year DST is predicted for the indefinite future. 1094 For example, for all-year Eastern Daylight Time, zic now generates 1095 "XXX3EDT4,0/0,J365/23" where it previously generated 1096 "EST5EDT,0/0,J365/25" or "". (Thanks to Michael Deckers for 1097 noting the possibility of POSIX conformance.) 1098 1099 zic.c no longer requires sys/wait.h (thanks to spazmodius for 1100 noting it wasn't needed). 1101 1102 When reading slim TZif files, zdump no longer mishandles leap 1103 seconds on the rare platforms where time_t counts leap seconds, 1104 fixing a bug introduced in 2014g. 1105 1106 zdump -v now outputs timestamps at boundaries of what localtime 1107 and gmtime can represent, instead of the less useful timestamps 1108 one day after the minimum and one day before the maximum. 1109 (Thanks to Arthur David Olson for prototype code, and to Manuela 1110 Friedrich for debugging help.) 1111 1112 zdump's -c and -t options are now consistently inclusive for the 1113 lower time bound and exclusive for the upper. Formerly they were 1114 inconsistent. (Confusion noted by Martin Burnicki.) 1115 1116 Changes to build procedure 1117 1118 You can now compile with -DHAVE_MALLOC_ERRNO=0 to port to 1119 non-POSIX hosts where malloc doesn't set errno. 1120 (Problem reported by Jan Engelhardt.) 1121 1122 Changes to documentation 1123 1124 tzfile.5 better matches a draft successor to RFC 8536 1125 <https://datatracker.ietf.org/doc/draft-murchison-rfc8536bis/01/>. 1126 1127 1128 Release 2021a - 2021-01-24 10:54:57 -0800 1129 1130 Changes to future timestamps 1131 1132 South Sudan changes from +03 to +02 on 2021-02-01 at 00:00. 1133 (Thanks to Steffen Thorsen.) 1134 1135 1136 Release 2020f - 2020-12-29 00:17:46 -0800 1137 1138 Change to build procedure 1139 1140 'make rearguard_tarballs' no longer generates a bad rearguard.zi, 1141 fixing a 2020e bug. (Problem reported by Deborah Goldsmith.) 1142 1143 1144 Release 2020e - 2020-12-22 15:14:34 -0800 1145 1146 Briefly: 1147 Volgograd switches to Moscow time on 2020-12-27 at 02:00. 1148 1149 Changes to future timestamps 1150 1151 Volgograd changes time zone from +04 to +03 on 2020-12-27 at 02:00. 1152 (Thanks to Alexander Krivenyshev and Stepan Golosunov.) 1153 1154 Changes to past timestamps 1155 1156 Correct many pre-1986 transitions, fixing entries originally 1157 derived from Shanks. The fixes include: 1158 - Australia: several 1917 through 1971 transitions 1159 - The Bahamas: several 1941 through 1945 transitions 1160 - Bermuda: several 1917 through 1956 transitions 1161 - Belize: several 1942 through 1968 transitions 1162 - Ghana: several 1915 through 1956 transitions 1163 - Israel and Palestine: several 1940 through 1985 transitions 1164 - Kenya and adjacent: several 1908 through 1960 transitions 1165 - Nigeria and adjacent: correcting LMT in Lagos, and several 1905 1166 through 1919 transitions 1167 - Seychelles: the introduction of standard time in 1907, not 1906 1168 - Vanuatu: DST in 1973-1974, and a corrected 1984 transition 1169 (Thanks to P Chan.) 1170 1171 Because of the Australia change, Australia/Currie (King Island) is 1172 no longer needed, as it is identical to Australia/Hobart for all 1173 timestamps since 1970 and was therefore created by mistake. 1174 Australia/Currie has been moved to the 'backward' file and its 1175 corrected data moved to the 'backzone' file. 1176 1177 Changes to past time zone abbreviations and DST flags 1178 1179 To better match legislation in Turks and Caicos, the 2015 shift to 1180 year-round observance of -04 is now modeled as AST throughout before 1181 returning to Eastern Time with US DST in 2018, rather than as 1182 maintaining EDT until 2015-11-01. (Thanks to P Chan.) 1183 1184 Changes to documentation 1185 1186 The zic man page now documents zic's coalescing of transitions 1187 when a zone falls back just before DST springs forward. 1188 1189 1190 Release 2020d - 2020-10-21 11:24:13 -0700 1191 1192 Briefly: 1193 Palestine ends DST earlier than predicted, on 2020-10-24. 1194 1195 Changes to past and future timestamps 1196 1197 Palestine ends DST on 2020-10-24 at 01:00, instead of 2020-10-31 1198 as previously predicted (thanks to Sharef Mustafa.) Its 1199 2019-10-26 fall-back was at 00:00, not 01:00 (thanks to Steffen 1200 Thorsen.) Its 2015-10-23 transition was at 01:00 not 00:00, and 1201 its spring 2020 transition was on March 28 at 00:00, not March 27 1202 (thanks to Pierre Cashon.) This affects Asia/Gaza and 1203 Asia/Hebron. Assume future spring and fall transitions will be on 1204 the Saturday preceding the last Sunday of March and October, 1205 respectively. 1206 1207 1208 Release 2020c - 2020-10-16 11:15:53 -0700 1209 1210 Briefly: 1211 Fiji starts DST later than usual, on 2020-12-20. 1212 1213 Changes to future timestamps 1214 1215 Fiji will start DST on 2020-12-20, instead of 2020-11-08 as 1216 previously predicted. DST will still end on 2021-01-17. 1217 (Thanks to Raymond Kumar and Alan Mintz.) Assume for now that 1218 the later-than-usual start date is a one-time departure from the 1219 recent pattern. 1220 1221 Changes to build procedure 1222 1223 Rearguard tarballs now contain an empty file pacificnew. 1224 Some older downstream software expects this file to exist. 1225 (Problem reported by Mike Cullinan.) 1226 1227 1228 Release 2020b - 2020-10-06 18:35:04 -0700 1229 1230 Briefly: 1231 Revised predictions for Morocco's changes starting in 2023. 1232 Canada's Yukon changes to -07 on 2020-11-01, not 2020-03-08. 1233 Macquarie Island has stayed in sync with Tasmania since 2011. 1234 Casey, Antarctica is at +08 in winter and +11 in summer. 1235 zic no longer supports -y, nor the TYPE field of Rules. 1236 1237 Changes to future timestamps 1238 1239 Morocco's spring-forward after Ramadan is now predicted to occur 1240 no sooner than two days after Ramadan, instead of one day. 1241 (Thanks to Milamber.) The first altered prediction is for 2023, 1242 now predicted to spring-forward on April 30 instead of April 23. 1243 1244 Changes to past and future timestamps 1245 1246 Casey Station, Antarctica has been using +08 in winter and +11 in 1247 summer since 2018. The most recent transition from +08 to +11 was 1248 2020-10-04 00:01. Also, Macquarie Island has been staying in 1249 sync with Tasmania since 2011. (Thanks to Steffen Thorsen.) 1250 1251 Changes to past and future time zone abbreviations and DST flags 1252 1253 Canada's Yukon, represented by America/Whitehorse and 1254 America/Dawson, changes its time zone rules from -08/-07 to 1255 permanent -07 on 2020-11-01, not on 2020-03-08 as 2020a had it. 1256 This change affects only the time zone abbreviation (MST vs PDT) 1257 and daylight saving flag for the period between the two dates. 1258 (Thanks to Andrew G. Smith.) 1259 1260 Changes to past timestamps 1261 1262 Correct several transitions for Hungary for 1918/1983. 1263 For example, the 1983-09-25 fall-back was at 01:00, not 03:00. 1264 (Thanks to Gza Nyry.) Also, the 1890 transition to standard 1265 time was on 11-01, not 10-01 (thanks to Michael Deckers). 1266 1267 The 1891 French transition was on March 16, not March 15. The 1268 1911-03-11 French transition was at midnight, not a minute later. 1269 Monaco's transitions were on 1892-06-01 and 1911-03-29, not 1270 1891-03-15 and 1911-03-11. (Thanks to Michael Deckers.) 1271 1272 Changes to code 1273 1274 Support for zic's long-obsolete '-y YEARISTYPE' option has been 1275 removed and, with it, so has support for the TYPE field in Rule 1276 lines, which is now reserved for compatibility with earlier zic. 1277 These features were previously deprecated in release 2015f. 1278 (Thanks to Tim Parenti.) 1279 1280 zic now defaults to '-b slim' instead of to '-b fat'. 1281 1282 zic's new '-l -' and '-p -' options uninstall any existing 1283 localtime and posixrules files, respectively. 1284 1285 The undocumented and ineffective tzsetwall function has been 1286 removed. 1287 1288 Changes to build procedure 1289 1290 The Makefile now defaults POSIXRULES to '-', so the posixrules 1291 feature (obsolete as of 2019b) is no longer installed by default. 1292 1293 Changes to documentation and commentary 1294 1295 The long-obsolete files pacificnew, systemv, and yearistype.sh have 1296 been removed from the distribution. (Thanks to Tim Parenti.) 1297 1298 1299 Release 2020a - 2020-04-23 16:03:47 -0700 1300 1301 Briefly: 1302 Morocco springs forward on 2020-05-31, not 2020-05-24. 1303 Canada's Yukon advanced to -07 year-round on 2020-03-08. 1304 America/Nuuk renamed from America/Godthab. 1305 zic now supports expiration dates for leap second lists. 1306 1307 Changes to future timestamps 1308 1309 Morocco's second spring-forward transition in 2020 will be May 31, 1310 not May 24 as predicted earlier. (Thanks to Semlali Naoufal.) 1311 Adjust future-year predictions to use the first Sunday after the 1312 day after Ramadan, not the first Sunday after Ramadan. 1313 1314 Canada's Yukon, represented by America/Whitehorse and 1315 America/Dawson, advanced to -07 year-round, beginning with its 1316 spring-forward transition on 2020-03-08, and will not fall back on 1317 2020-11-01. Although a government press release calls this 1318 "permanent Pacific Daylight Saving Time", we prefer MST for 1319 consistency with nearby Dawson Creek, Creston, and Fort Nelson. 1320 (Thanks to Tim Parenti.) 1321 1322 Changes to past timestamps 1323 1324 Shanghai observed DST in 1919. (Thanks to Phake Nick.) 1325 1326 Changes to timezone identifiers 1327 1328 To reflect current usage in English better, America/Godthab has 1329 been renamed to America/Nuuk. A backwards-compatibility link 1330 remains for the old name. 1331 1332 Changes to code 1333 1334 localtime.c no longer mishandles timestamps after the last 1335 transition in a TZif file with leap seconds and with daylight 1336 saving time transitions projected into the indefinite future. 1337 For example, with TZ='America/Los_Angeles' with leap seconds, 1338 zdump formerly reported a DST transition on 2038-03-14 1339 from 01:59:32.999... to 02:59:33 instead of the correct transition 1340 from 01:59:59.999... to 03:00:00. 1341 1342 zic -L now supports an Expires line in the leapseconds file, and 1343 truncates the TZif output accordingly. This propagates leap 1344 second expiration information into the TZif file, and avoids the 1345 abovementioned localtime.c bug as well as similar bugs present in 1346 many client implementations. If no Expires line is present, zic 1347 -L instead truncates the TZif output based on the #expires comment 1348 present in leapseconds files distributed by tzdb 2018f and later; 1349 however, this usage is obsolescent. For now, the distributed 1350 leapseconds file has an Expires line that is commented out, so 1351 that the file can be fed to older versions of zic which ignore the 1352 commented-out line. Future tzdb distributions are planned to 1353 contain a leapseconds file with an Expires line. 1354 1355 The configuration macros HAVE_TZNAME and USG_COMPAT should now be 1356 set to 1 if the system library supports the feature, and 2 if not. 1357 As before, these macros are nonzero if tzcode should support the 1358 feature, zero otherwise. 1359 1360 The configuration macro ALTZONE now has the same values with the 1361 same meaning as HAVE_TZNAME and USG_COMPAT. 1362 1363 The code's defense against CRLF in leap-seconds.list is now 1364 portable to POSIX awk. (Problem reported by Deborah Goldsmith.) 1365 1366 Although the undocumented tzsetwall function is not changed in 1367 this release, it is now deprecated in preparation for removal in 1368 future releases. Due to POSIX requirements, tzsetwall has not 1369 worked for some time. Any code that uses it should instead use 1370 tzalloc(NULL) or, if portability trumps thread-safety, should 1371 unset the TZ environment variable. 1372 1373 Changes to commentary 1374 1375 The les-de-la-Madeleine and the Listuguj reserve are noted as 1376 following America/Halifax, and comments about Yukon's "south" and 1377 "north" have been corrected to say "east" and "west". (Thanks to 1378 Jeffery Nichols.) 1379 1380 1381 Release 2019c - 2019-09-11 08:59:48 -0700 1382 1383 Briefly: 1384 Fiji observes DST from 2019-11-10 to 2020-01-12. 1385 Norfolk Island starts observing Australian-style DST. 1386 1387 Changes to future timestamps 1388 1389 Fiji's next DST transitions will be 2019-11-10 and 2020-01-12 1390 instead of 2019-11-03 and 2020-01-19. (Thanks to Raymond Kumar.) 1391 Adjust future guesses accordingly. 1392 1393 Norfolk Island will observe Australian-style DST starting in 1394 spring 2019. The first transition is on 2019-10-06. (Thanks to 1395 Kyle Czech and Michael Deckers.) 1396 1397 Changes to past timestamps 1398 1399 Many corrections to time in Turkey from 1940 through 1985. 1400 (Thanks to Oya Vula via Alois Treindl, and to Kvan Yazan.) 1401 1402 The Norfolk Island 1975-03-02 transition was at 02:00 standard 1403 time, not 02:00 DST. (Thanks to Michael Deckers.) 1404 1405 South Korea observed DST from 1948 through 1951. Although this 1406 info was supposed to appear in release 2014j, a typo inadvertently 1407 suppressed the change. (Thanks to Alois Treindl.) 1408 1409 Detroit observed DST in 1967 and 1968 following the US DST rules, 1410 except that its 1967 DST began on June 14 at 00:01. (Thanks to 1411 Alois Treindl for pointing out that the old data entries were 1412 probably wrong.) 1413 1414 Fix several errors in pre-1970 transitions in Perry County, IN. 1415 (Thanks to Alois Treindl for pointing out the 1967/9 errors.) 1416 1417 Edmonton did not observe DST in 1967 or 1969. In 1946 Vancouver 1418 ended DST on 09-29 not 10-13, and Vienna ended DST on 10-07 not 1419 10-06. In 1945 Knigsberg (now Kaliningrad) switched from +01/+02 1420 to +02/+03 on 04-10 not 01-01, and its +02/+03 is abbreviated 1421 EET/EEST, not CET/CEST. (Thanks to Alois Treindl.) In 1946 1422 Knigsberg switched to +03 on 04-07 not 01-01. 1423 1424 In 1946 Louisville switched from CST to CDT on 04-28 at 00:01, not 1425 01-01 at 00:00. (Thanks to Alois Treindl and Michael Deckers.) 1426 Also, it switched from CST to CDT on 1950-04-30, not 1947-04-27. 1427 1428 The 1892-05-01 transition in Brussels was at 00:17:30, not at noon. 1429 (Thanks to Michael Deckers.) 1430 1431 Changes to past time zone abbreviations and DST flags 1432 1433 Hong Kong Winter Time, observed from 1941-10-01 to 1941-12-25, 1434 is now flagged as DST and is abbreviated HKWT not HKT. 1435 1436 Changes to code 1437 1438 leapseconds.awk now relies only on its input data, rather than 1439 also relying on its comments. (Inspired by code from Dennis 1440 Ferguson and Chris Woodbury.) 1441 1442 The code now defends against CRLFs in leap-seconds.list. 1443 (Thanks to Brian Inglis and Chris Woodbury.) 1444 1445 Changes to documentation and commentary 1446 1447 theory.html discusses leap seconds. (Thanks to Steve Summit.) 1448 1449 Nashville's newspapers dueled about the time of day in the 1950s. 1450 (Thanks to John Seigenthaler.) 1451 1452 Liechtenstein observed Swiss DST in 1941/2. 1453 (Thanks to Alois Treindl.) 1454 1455 1456 Release 2019b - 2019-07-01 00:09:53 -0700 1457 1458 Briefly: 1459 Brazil no longer observes DST. 1460 'zic -b slim' outputs smaller TZif files; please try it out. 1461 Palestine's 2019 spring-forward transition was on 03-29, not 03-30. 1462 1463 Changes to future timestamps 1464 1465 Brazil has canceled DST and will stay on standard time indefinitely. 1466 (Thanks to Steffen Thorsen, Marcus Diniz, and Daniel Soares de 1467 Oliveira.) 1468 1469 Predictions for Morocco now go through 2087 instead of 2037, to 1470 work around a problem on newlib when using TZif files output by 1471 zic 2019a or earlier. (Problem reported by David Gauchard.) 1472 1473 Changes to past and future timestamps 1474 1475 Palestine's 2019 spring transition was 03-29 at 00:00, not 03-30 1476 at 01:00. (Thanks to Sharef Mustafa and Even Scharning.) Guess 1477 future transitions to be March's last Friday at 00:00. 1478 1479 Changes to past timestamps 1480 1481 Hong Kong's 1941-06-15 spring-forward transition was at 03:00, not 1482 03:30. Its 1945 transition from JST to HKT was on 11-18 at 02:00, 1483 not 09-15 at 00:00. In 1946 its spring-forward transition was on 1484 04-21 at 00:00, not the previous day at 03:30. From 1946 through 1485 1952 its fall-back transitions occurred at 04:30, not at 03:30. 1486 In 1947 its fall-back transition was on 11-30, not 12-30. 1487 (Thanks to P Chan.) 1488 1489 Changes to past time zone abbreviations 1490 1491 Italy's 1866 transition to Rome Mean Time was on December 12, not 1492 September 22. This affects only the time zone abbreviation for 1493 Europe/Rome between those dates. (Thanks to Stephen Trainor and 1494 Luigi Rosa.) 1495 1496 Changes affecting metadata only 1497 1498 Add info about the Crimea situation in zone1970.tab and zone.tab. 1499 (Problem reported by Serhii Demediuk.) 1500 1501 Changes to code 1502 1503 zic's new -b option supports a way to control data bloat and to 1504 test for year-2038 bugs in software that reads TZif files. 1505 'zic -b fat' and 'zic -b slim' generate larger and smaller output; 1506 for example, changing from fat to slim shrinks the Europe/London 1507 file from 3648 to 1599 bytes, saving about 56%. Fat and slim 1508 files represent the same set of timestamps and use the same TZif 1509 format as documented in tzfile(5) and in Internet RFC 8536. 1510 Fat format attempts to work around bugs or incompatibilities in 1511 older software, notably software that mishandles 64-bit TZif data 1512 or uses obsolete TZ strings like "EET-2EEST" that lack DST rules. 1513 Slim format is more efficient and does not work around 64-bit bugs 1514 or obsolete TZ strings. Currently zic defaults to fat format 1515 unless you compile with -DZIC_BLOAT_DEFAULT=\"slim\"; this 1516 out-of-the-box default is intended to change in future releases 1517 as the buggy software often mishandles timestamps anyway. 1518 1519 zic no longer treats a set of rules ending in 2037 specially. 1520 Previously, zic assumed that such a ruleset meant that future 1521 timestamps could not be predicted, and therefore omitted a 1522 POSIX-like TZ string in the TZif output. The old behavior is no 1523 longer needed for current tzdata, and caused problems with newlib 1524 when used with older tzdata (reported by David Gauchard). 1525 1526 zic no longer generates some artifact transitions. For example, 1527 Europe/London no longer has a no-op transition in January 1996. 1528 1529 Changes to build procedure 1530 1531 tzdata.zi now assumes zic 2017c or later. This shrinks tzdata.zi 1532 by a percent or so. 1533 1534 Changes to documentation and commentary 1535 1536 The Makefile now documents the POSIXRULES macro as being obsolete, 1537 and similarly, zic's -p POSIXRULES option is now documented as 1538 being obsolete. Although the POSIXRULES feature still exists and 1539 works as before, in practice it is rarely used for its intended 1540 purpose, and it does not work either in the default reference 1541 implementation (for timestamps after 2037) or in common 1542 implementations such as GNU/Linux (for contemporary timestamps). 1543 Since POSIXRULES was designed primarily as a temporary transition 1544 facility for System V platforms that died off decades ago, it is 1545 being decommissioned rather than institutionalized. 1546 1547 New info on Bonin Islands and Marcus (thanks to Wakaba and Phake Nick). 1548 1549 1550 Release 2019a - 2019-03-25 22:01:33 -0700 1551 1552 Briefly: 1553 Palestine "springs forward" on 2019-03-30 instead of 2019-03-23. 1554 Metlakatla "fell back" to rejoin Alaska Time on 2019-01-20 at 02:00. 1555 1556 Changes to past and future timestamps 1557 1558 Palestine will not start DST until 2019-03-30, instead of 2019-03-23 as 1559 previously predicted. Adjust our prediction by guessing that spring 1560 transitions will be between 24 and 30 March, which matches recent practice 1561 since 2016. (Thanks to Even Scharning and Tim Parenti.) 1562 1563 Metlakatla ended its observance of Pacific standard time, 1564 rejoining Alaska Time, on 2019-01-20 at 02:00. (Thanks to Ryan 1565 Stanley and Tim Parenti.) 1566 1567 Changes to past timestamps 1568 1569 Israel observed DST in 1980 (08-02/09-13) and 1984 (05-05/08-25). 1570 (Thanks to Alois Treindl and Isaac Starkman.) 1571 1572 Changes to time zone abbreviations 1573 1574 Etc/UCT is now a backward-compatibility link to Etc/UTC, instead 1575 of being a separate zone that generates the abbreviation "UCT", 1576 which nowadays is typically a typo. (Problem reported by Isiah 1577 Meadows.) 1578 1579 Changes to code 1580 1581 zic now has an -r option to limit the time range of output data. 1582 For example, 'zic -r @1000000000' limits the output data to 1583 timestamps starting 1000000000 seconds after the Epoch. 1584 This helps shrink output size and can be useful for applications 1585 not needing the full timestamp history, such as TZDIST truncation; 1586 see Internet RFC 8536 section 5.1. (Inspired by a feature request 1587 from Christopher Wong, helped along by bug reports from Wong and 1588 from Tim Parenti.) 1589 1590 Changes to documentation 1591 1592 Mention Internet RFC 8536 (February 2019), which documents TZif. 1593 1594 tz-link.html now cites tzdata-meta 1595 <https://tzdata-meta.timtimeonline.com/>. 1596 1597 1598 Release 2018i - 2018-12-30 11:05:43 -0800 1599 1600 Briefly: 1601 So Tom and Prncipe switches from +01 to +00 on 2019-01-01. 1602 1603 Changes to future timestamps 1604 1605 Due to a change in government, So Tom and Prncipe switches back 1606 from +01 to +00 on 2019-01-01 at 02:00. (Thanks to Vadim 1607 Nasardinov and Michael Deckers.) 1608 1609 1610 Release 2018h - 2018-12-23 17:59:32 -0800 1611 1612 Briefly: 1613 Qyzylorda, Kazakhstan moved from +06 to +05 on 2018-12-21. 1614 New zone Asia/Qostanay because Qostanay, Kazakhstan didn't move. 1615 Metlakatla, Alaska observes PST this winter only. 1616 Guess Morocco will continue to adjust clocks around Ramadan. 1617 Add predictions for Iran from 2038 through 2090. 1618 1619 Changes to future timestamps 1620 1621 Guess that Morocco will continue to fall back just before and 1622 spring forward just after Ramadan, the practice since 2012. 1623 (Thanks to Maamar Abdelkader.) This means Morocco will observe 1624 negative DST during Ramadan in main and vanguard formats, and in 1625 rearguard format it stays in the +00 timezone and observes 1626 ordinary DST in all months other than Ramadan. As before, extend 1627 this guesswork to the year 2037. As a consequence, Morocco is 1628 scheduled to observe three DST transitions in some Gregorian years 1629 (e.g., 2033) due to the mismatch between the Gregorian and Islamic 1630 calendars. 1631 1632 The table of exact transitions for Iranian DST has been extended. 1633 It formerly cut off before the year 2038 in a nod to 32-bit time_t. 1634 It now cuts off before 2091 as there is doubt about how the Persian 1635 calendar will treat 2091. This change predicts DST transitions in 1636 2038-9, 2042-3, and 2046-7 to occur one day later than previously 1637 predicted. As before, post-cutoff transitions are approximated. 1638 1639 Changes to past and future timestamps 1640 1641 Qyzylorda (aka Kyzylorda) oblast in Kazakhstan moved from +06 to 1642 +05 on 2018-12-21. This is a zone split as Qostanay (aka 1643 Kostanay) did not switch, so create a zone Asia/Qostanay. 1644 1645 Metlakatla moved from Alaska to Pacific standard time on 2018-11-04. 1646 It did not change clocks that day and remains on -08 this winter. 1647 (Thanks to Ryan Stanley.) It will revert to the usual Alaska 1648 rules next spring, so this change affects only timestamps 1649 from 2018-11-04 through 2019-03-10. 1650 1651 Change to past timestamps 1652 1653 Kwajalein's 1993-08-20 transition from -12 to +12 was at 24:00, 1654 not 00:00. I transcribed the time incorrectly from Shanks. 1655 (Thanks to Phake Nick.) 1656 1657 Nauru's 1979 transition was on 02-10 at 02:00, not 05-01 at 00:00. 1658 (Thanks to Phake Nick.) 1659 1660 Guam observed DST irregularly from 1959 through 1977. 1661 (Thanks to Phake Nick.) 1662 1663 Hong Kong observed DST in 1941 starting 06-15 (not 04-01), then on 1664 10-01 changed standard time to +08:30 (not +08). Its transition 1665 back to +08 after WWII was on 1945-09-15, not the previous day. 1666 Its 1904-10-30 change took effect at 01:00 +08 (not 00:00 LMT). 1667 (Thanks to Phake Nick, Steve Allen, and Joseph Myers.) Also, 1668 its 1952 fallback was on 11-02 (not 10-25). 1669 1670 This release contains many changes to timestamps before 1946 due 1671 to Japanese possession or occupation of Pacific/Chuuk, 1672 Pacific/Guam, Pacific/Kosrae, Pacific/Kwajalein, Pacific/Majuro, 1673 Pacific/Nauru, Pacific/Palau, and Pacific/Pohnpei. 1674 (Thanks to Phake Nick.) 1675 1676 Assume that the Spanish East Indies was like the Philippines and 1677 observed American time until the end of 1844. This affects 1678 Pacific/Chuuk, Pacific/Kosrae, Pacific/Palau, and Pacific/Pohnpei. 1679 1680 Changes to past tm_isdst flags 1681 1682 For the recent Morocco change, the tm_isdst flag should be 1 from 1683 2018-10-27 00:00 to 2018-10-28 03:00. (Thanks to Michael Deckers.) 1684 Give a URL to the official decree. (Thanks to Matt Johnson.) 1685 1686 1687 Release 2018g - 2018-10-26 22:22:45 -0700 1688 1689 Briefly: 1690 Morocco switches to permanent +01 on 2018-10-28. 1691 1692 Changes to future timestamps 1693 1694 Morocco switches from +00/+01 to permanent +01 effective 2018-10-28, 1695 so its clocks will not fall back as previously scheduled. 1696 (Thanks to Mohamed Essedik Najd and Brian Inglis.) 1697 1698 Changes to code 1699 1700 When generating TZif files with leap seconds, zic no longer uses a 1701 format that trips up older 32-bit clients, fixing a bug introduced 1702 in 2018f. (Reported by Daniel Fischer.) Also, the zic workaround 1703 for QTBUG-53071 now also works for TZif files with leap seconds. 1704 1705 The translator to rearguard format now rewrites the line 1706 "Rule Japan 1948 1951 - Sep Sat>=8 25:00 0 S" to 1707 "Rule Japan 1948 1951 - Sep Sun>=9 1:00 0 S". 1708 This caters to zic before 2007 and to Oracle TZUpdater 2.2.0 1709 and earlier. (Reported by Christos Zoulas.) 1710 1711 Changes to past time zone abbreviations 1712 1713 Change HDT to HWT/HPT for WWII-era abbreviations in Hawaii. 1714 This reverts to 2011h, as the abbreviation change in 2011i was 1715 likely inadvertent. 1716 1717 Changes to documentation 1718 1719 tzfile.5 has new sections on interoperability issues. 1720 1721 1722 Release 2018f - 2018-10-18 00:14:18 -0700 1723 1724 Briefly: 1725 Volgograd moves from +03 to +04 on 2018-10-28. 1726 Fiji ends DST 2019-01-13, not 2019-01-20. 1727 Most of Chile changes DST dates, effective 2019-04-06. 1728 1729 Changes to future timestamps 1730 1731 Volgograd moves from +03 to +04 on 2018-10-28 at 02:00. 1732 (Thanks to Alexander Fetisov and Stepan Golosunov.) 1733 1734 Fiji ends DST 2019-01-13 instead of the 2019-01-20 previously 1735 predicted. (Thanks to Raymond Kumar.) Adjust future predictions 1736 accordingly. 1737 1738 Most of Chile will end DST on the first Saturday in April at 24:00 mainland 1739 time, and resume DST on the first Saturday in September at 24:00 mainland 1740 time. The changes are effective from 2019-04-06, and do not affect the 1741 Magallanes region modeled by America/Punta_Arenas. (Thanks to Juan Correa 1742 and Tim Parenti.) Adjust future predictions accordingly. 1743 1744 Changes to past timestamps 1745 1746 The 2018-05-05 North Korea 30-minute time zone change took place 1747 at 23:30 the previous day, not at 00:00 that day. 1748 1749 China's 1988 spring-forward transition was on April 17, not 1750 April 10. Its DST transitions in 1986/91 were at 02:00, not 00:00. 1751 (Thanks to P Chan.) 1752 1753 Fix several issues for Macau before 1992. Macau's pre-1904 LMT 1754 was off by 10 s. Macau switched to +08 in 1904 not 1912, and 1755 temporarily switched to +09/+10 during World War II. Macau 1756 observed DST in 1942/79, not 1961/80, and there were several 1757 errors for transition times and dates. (Thanks to P Chan.) 1758 1759 The 1948-1951 fallback transitions in Japan were at 25:00 on 1760 September's second Saturday, not at 24:00. (Thanks to Phake Nick.) 1761 zic turns this into 01:00 on the day after September's second 1762 Saturday, which is the best that POSIX or C platforms can do. 1763 1764 Incorporate 1940-1949 Asia/Shanghai DST transitions from a 2014 1765 paper by Li Yu, replacing more-questionable data from Shanks. 1766 1767 Changes to time zone abbreviations 1768 1769 Use "PST" and "PDT" for Philippine time. (Thanks to Paul Goyette.) 1770 1771 Changes to code 1772 1773 zic now always generates TZif files where time type 0 is used for 1774 timestamps before the first transition. This simplifies the 1775 reading of TZif files and should not affect behavior of existing 1776 TZif readers because the same set of time types is used; only 1777 their internal indexes may have changed. This affects only the 1778 legacy zones EST5EDT, CST6CDT, MST7MDT, PST8PDT, CET, MET, and 1779 EET, which previously used nonzero types for these timestamps. 1780 1781 Because of the type 0 change, zic no longer outputs a dummy 1782 transition at time -2**59 (before the Big Bang), as clients should 1783 no longer need this to handle historical timestamps correctly. 1784 This reverts a change introduced in 2013d and shrinks most TZif 1785 files by a few bytes. 1786 1787 zic now supports negative time-of-day in Rule and Leap lines, e.g., 1788 "Rule X min max - Apr lastSun -6:00 1:00 -" means the transition 1789 occurs at 18:00 on the Saturday before the last Sunday in April. 1790 This behavior was documented in 2018a but the code did not 1791 entirely match the documentation. 1792 1793 localtime.c no longer requires at least one time type in TZif 1794 files that lack transitions or have a POSIX-style TZ string. This 1795 future-proofs the code against possible future extensions to the 1796 format that would allow TZif files with POSIX-style TZ strings and 1797 without transitions or time types. 1798 1799 A read-access subscript error in localtime.c has been fixed. 1800 It could occur only in TZif files with timecnt == 0, something that 1801 does not happen in practice now but could happen in future versions. 1802 1803 localtime.c no longer ignores TZif POSIX-style TZ strings that 1804 specify only standard time. Instead, these TZ strings now 1805 override the default time type for timestamps after the last 1806 transition (or for all timestamps if there are no transitions), 1807 just as DST strings specifying DST have always done. 1808 1809 leapseconds.awk now outputs "#updated" and "#expires" comments, 1810 and supports leap seconds at the ends of months other than June 1811 and December. (Inspired by suggestions from Chris Woodbury.) 1812 1813 Changes to documentation 1814 1815 New restrictions: A Rule name must start with a character that 1816 is neither an ASCII digit nor "-" nor "+", and an unquoted name 1817 should not use characters in the set "!$%&'()*,/:;<=>?@[\]^`{|}~". 1818 The latter restriction makes room for future extensions (a 1819 possibility noted by Tom Lane). 1820 1821 tzfile.5 now documents what time types apply before the first and 1822 after the last transition, if any. 1823 1824 Documentation now uses the spelling "timezone" for a TZ setting 1825 that determines timestamp history, and "time zone" for a 1826 geographic region currently sharing the same standard time. 1827 1828 The name "TZif" is now used for the tz binary data format. 1829 1830 tz-link.htm now mentions the A0 TimeZone Migration utilities. 1831 (Thanks to Aldrin Martoq for the link.) 1832 1833 Changes to build procedure 1834 1835 New 'make' target 'rearguard_tarballs' to build the rearguard 1836 tarball only. This is a convenience on platforms that lack lzip 1837 if you want to build the rearguard tarball. (Problem reported by 1838 Deborah Goldsmith.) 1839 1840 tzdata.zi is now more stable from release to release. (Problem 1841 noted by Tom Lane.) It is also a bit shorter. 1842 1843 tzdata.zi now can contain comment lines documenting configuration 1844 information, such as which data format was selected, which input 1845 files were used, and how leap seconds are treated. (Problems 1846 noted by Lester Caine and Brian Inglis.) If the Makefile defaults 1847 are used these comment lines are absent, for backward 1848 compatibility. A redistributor intending to alter its copy of the 1849 files should also append "-LABEL" to the 'version' file's first 1850 line, where "LABEL" identifies the redistributor's change. 1851 1852 1853 Release 2018e - 2018-05-01 23:42:51 -0700 1854 1855 Briefly: 1856 1857 North Korea switches back to +09 on 2018-05-05. 1858 The main format uses negative DST again, for Ireland etc. 1859 'make tarballs' now also builds a rearguard tarball. 1860 New 's' and 'd' suffixes in SAVE columns of Rule and Zone lines. 1861 1862 Changes to past and future timestamps 1863 1864 North Korea switches back from +0830 to +09 on 2018-05-05. 1865 (Thanks to Kang Seonghoon, Arthur David Olson, Seo Sanghyeon, 1866 and Tim Parenti.) 1867 1868 Bring back the negative-DST changes of 2018a, except be more 1869 compatible with data parsers that do not support negative DST. 1870 Also, this now affects historical timestamps in Namibia and the 1871 former Czechoslovakia, not just Ireland. The main format now uses 1872 negative DST to model timestamps in Europe/Dublin (from 1971 on), 1873 Europe/Prague (1946/7), and Africa/Windhoek (1994/2017). This 1874 does not affect UT offsets, only time zone abbreviations and the 1875 tm_isdst flag. Also, this does not affect rearguard or vanguard 1876 formats; effectively the main format now uses vanguard instead of 1877 rearguard format. Data parsers that do not support negative DST 1878 can still use data from the rearguard tarball described below. 1879 1880 Changes to build procedure 1881 1882 The command 'make tarballs' now also builds the tarball 1883 tzdataVERSION-rearguard.tar.gz, which is like tzdataVERSION.tar.gz 1884 except that it uses rearguard format intended for trailing-edge 1885 data parsers. 1886 1887 Changes to data format and to code 1888 1889 The SAVE column of Rule and Zone lines can now have an 's' or 'd' 1890 suffix, which specifies whether the adjusted time is standard time 1891 or daylight saving time. If no suffix is given, daylight saving 1892 time is used if and only if the SAVE column is nonzero; this is 1893 the longstanding behavior. Although this new feature is not used 1894 in tzdata, it could be used to specify the legal time in Namibia 1895 1994-2017, as opposed to the popular time (see below). 1896 1897 Changes to past timestamps 1898 1899 From 1994 through 2017 Namibia observed DST in winter, not summer. 1900 That is, it used negative DST, as Ireland still does. This change 1901 does not affect UTC offsets; it affects only the tm_isdst flag and 1902 the abbreviation used during summer, which is now CAT, not WAST. 1903 Although (as noted by Michael Deckers) summer and winter time were 1904 both simply called "standard time" in Namibian law, in common 1905 practice winter time was considered to be DST (as noted by Stephen 1906 Colebourne). The full effect of this change is only in vanguard 1907 and main format; in rearguard format, the tm_isdst flag is still 1908 zero in winter and nonzero in summer. 1909 1910 In 1946/7 Czechoslovakia also observed negative DST in winter. 1911 The full effect of this change is only in vanguard and main 1912 formats; in rearguard format, it is modeled as plain GMT without 1913 daylight saving. Also, the dates of some 1944/5 DST transitions 1914 in Czechoslovakia have been changed. 1915 1916 1917 Release 2018d - 2018-03-22 07:05:46 -0700 1918 1919 Briefly: 1920 1921 Palestine starts DST a week earlier in 2018. 1922 Add support for vanguard and rearguard data consumers. 1923 Add subsecond precision to source data format, though not to data. 1924 1925 Changes to future timestamps 1926 1927 In 2018, Palestine starts DST on March 24, not March 31. 1928 Adjust future predictions accordingly. (Thanks to Sharef Mustafa.) 1929 1930 Changes to past and future timestamps 1931 1932 Casey Station in Antarctica changed from +11 to +08 on 2018-03-11 1933 at 04:00. (Thanks to Steffen Thorsen.) 1934 1935 Changes to past timestamps 1936 1937 Historical transitions for Uruguay, represented by 1938 America/Montevideo, have been updated per official legal documents, 1939 replacing previous data mainly originating from the inventions of 1940 Shanks & Pottenger. This has resulted in adjustments ranging from 1941 30 to 90 minutes in either direction over at least two dozen 1942 distinct periods ranging from one day to several years in length. 1943 A mere handful of pre-1991 transitions are unaffected; data since 1944 then has come from more reliable contemporaneous reporting. These 1945 changes affect various timestamps in 1920-1923, 1936, 1939, 1946 1942-1943, 1959, 1966-1970, 1972, 1974-1980, and 1988-1990. 1947 Additionally, Uruguay's pre-standard-time UT offset has been 1948 adjusted westward by 7 seconds, from UT-03:44:44 to UT-03:44:51, to 1949 match the location of the Observatory of the National Meteorological 1950 Institute in Montevideo. 1951 (Thanks to Jeremie Bonjour, Tim Parenti, and Michael Deckers.) 1952 1953 East Kiribati skipped New Year's Eve 1994, not New Year's Day 1995. 1954 (Thanks to Kerry Shetline.) 1955 1956 Fix the 1912-01-01 transition for Portugal and its colonies. 1957 This transition was at 00:00 according to the new UT offset, not 1958 according to the old one. Also assume that Cape Verde switched on 1959 the same date as the rest, not in 1907. This affects 1960 Africa/Bissau, Africa/Sao_Tome, Asia/Macau, Atlantic/Azores, 1961 Atlantic/Cape_Verde, Atlantic/Madeira, and Europe/Lisbon. 1962 (Thanks to Michael Deckers.) 1963 1964 Fix an off-by-1 error for pre-1913 timestamps in Jamaica and in 1965 Turks & Caicos. 1966 1967 Changes to past time zone abbreviations 1968 1969 MMT took effect in Uruguay from 1908-06-10, not 1898-06-28. There 1970 is no clock change associated with the transition. 1971 1972 Changes to build procedure 1973 1974 The new DATAFORM macro in the Makefile lets the installer choose 1975 among three source data formats. The idea is to lessen downstream 1976 disruption when data formats are improved. 1977 1978 * DATAFORM=vanguard installs from the latest, bleeding-edge 1979 format. DATAFORM=main (the default) installs from the format 1980 used in the 'africa' etc. files. DATAFORM=rearguard installs 1981 from a trailing-edge format. Eventually, elements of today's 1982 vanguard format should move to the main format, and similarly 1983 the main format's features should eventually move to the 1984 rearguard format. 1985 1986 * In the current version, the main and rearguard formats are 1987 identical and match that of 2018c, so this change does not 1988 affect default behavior. The vanguard format currently contains 1989 one feature not in the main format: negative SAVE values. This 1990 improves support for Ireland, which uses Irish Standard Time 1991 (IST, UTC+01) in summer and GMT (UTC) in winter. tzcode has 1992 supported negative SAVE values for decades, and this feature 1993 should move to the main format soon. However, it will not move 1994 to the rearguard format for quite some time because some 1995 downstream parsers do not support it. 1996 1997 * The build procedure constructs three files vanguard.zi, main.zi, 1998 and rearguard.zi, one for each format. Although the files 1999 represent essentially the same data, they may have minor 2000 discrepancies that users are not likely to notice. The files 2001 are intended for downstream data consumers and are not 2002 installed. Zoneinfo parsers that do not support negative SAVE values 2003 should start using rearguard.zi, so that they will be unaffected 2004 when the negative-DST feature moves from vanguard to main. 2005 Bleeding-edge Zoneinfo parsers that support the new features 2006 already can use vanguard.zi; in this respect, current tzcode is 2007 bleeding-edge. 2008 2009 The Makefile should now be safe for parallelized builds, and 'make 2010 -j to2050new.tzs' is now much faster on a multiprocessor host 2011 with GNU Make. 2012 2013 When built with -DSUPPRESS_TZDIR, the tzcode library no longer 2014 prepends TZDIR/ to file names that do not begin with '/'. This is 2015 not recommended for general use, due to its security implications. 2016 (From a suggestion by Manuela Friedrich.) 2017 2018 Changes to code 2019 2020 zic now accepts subsecond precision in expressions like 2021 00:19:32.13, which is approximately the legal time of the 2022 Netherlands from 1835 to 1937. However, because it is 2023 questionable whether the few recorded uses of non-integer offsets 2024 had subsecond precision in practice, there are no plans for tzdata 2025 to use this feature. (Thanks to Steve Allen for pointing out 2026 the limitations of historical data in this area.) 2027 2028 The code is a bit more portable to MS-Windows. Installers can 2029 compile with -DRESERVE_STD_EXT_IDS on MS-Windows platforms that 2030 reserve identifiers like 'localtime'. (Thanks to Manuela 2031 Friedrich.) 2032 2033 Changes to documentation and commentary 2034 2035 theory.html now outlines tzdb's extensions to POSIX's model for 2036 civil time, and has a section "POSIX features no longer needed" 2037 that lists POSIX API components that are now vestigial. 2038 (From suggestions by Steve Summit.) It also better distinguishes 2039 time zones from tz regions. (From a suggestion by Guy Harris.) 2040 2041 Commentary is now more consistent about using the phrase "daylight 2042 saving time", to match the C name tm_isdst. Daylight saving time 2043 need not occur in summer, and need not have a positive offset from 2044 standard time. 2045 2046 Commentary about historical transitions in Uruguay has been expanded 2047 with links to many relevant legal documents. 2048 (Thanks to Tim Parenti.) 2049 2050 Commentary now uses some non-ASCII characters with Unicode value 2051 less than U+0100, as they can be useful and should work even with 2052 older editors such as XEmacs. 2053 2054 2055 Release 2018c - 2018-01-22 23:00:44 -0800 2056 2057 Briefly: 2058 Revert Irish changes that relied on negative SAVE values. 2059 2060 Changes to tm_isdst 2061 2062 Revert the 2018a change to Europe/Dublin. As before, this change 2063 does not affect UT offsets or abbreviations; it affects only 2064 whether timestamps are considered to be standard time or 2065 daylight-saving time, as expressed in the tm_isdst flag of C's 2066 struct tm type. This reversion is intended to be a temporary 2067 workaround for problems discovered with downstream uses of 2068 releases 2018a and 2018b, which implemented Irish time by using 2069 negative SAVE values in the Eire rules of the 'europe' file. 2070 Although negative SAVE values have been part of tzcode for many 2071 years and are supported by many platforms, they were not 2072 documented before 2018a and ICU and OpenJDK do not currently 2073 support them. A mechanism to export data to platforms lacking 2074 support for negative DST is planned to be developed before the 2075 change is reapplied. (Problems reported by Deborah Goldsmith and 2076 Stephen Colebourne.) 2077 2078 Changes to past timestamps 2079 2080 Japanese DST transitions (1948-1951) were Sundays at 00:00, not 2081 Saturdays or Sundays at 02:00. (Thanks to Takayuki Nikai.) 2082 2083 Changes to build procedure 2084 2085 The build procedure now works around mawk 1.3.3's lack of support 2086 for character class expressions. (Problem reported by Ohyama.) 2087 2088 2089 Release 2018b - 2018-01-17 23:24:48 -0800 2090 2091 Briefly: 2092 Fix a packaging problem in tz2018a, which was missing 'pacificnew'. 2093 2094 Changes to build procedure 2095 2096 The distribution now contains the file 'pacificnew' again. 2097 This file was inadvertently omitted in the 2018a distribution. 2098 (Problem reported by Matias Fonzo.) 2099 2100 2101 Release 2018a - 2018-01-12 22:29:21 -0800 2102 2103 Briefly: 2104 So Tom and Prncipe switched from +00 to +01. 2105 Brazil's DST will now start on November's first Sunday. 2106 Ireland's standard time is now in the summer, not the winter. 2107 Use Debian-style installation locations, instead of 4.3BSD-style. 2108 New zic option -t. 2109 2110 Changes to past and future timestamps 2111 2112 So Tom and Prncipe switched from +00 to +01 on 2018-01-01 at 2113 01:00. (Thanks to Steffen Thorsen and Michael Deckers.) 2114 2115 Changes to future timestamps 2116 2117 Starting in 2018 southern Brazil will begin DST on November's 2118 first Sunday instead of October's third Sunday. (Thanks to 2119 Steffen Thorsen.) 2120 2121 Changes to past timestamps 2122 2123 A discrepancy of 4 s in timestamps before 1931 in South Sudan has 2124 been corrected. The 'backzone' and 'zone.tab' files did not agree 2125 with the 'africa' and 'zone1970.tab' files. (Problem reported by 2126 Michael Deckers.) 2127 2128 The abbreviation invented for Bolivia Summer Time (1931-2) is now 2129 BST instead of BOST, to be more consistent with the convention 2130 used for Latvian Summer Time (1918-9) and for British Summer Time. 2131 2132 Changes to tm_isdst 2133 2134 Change Europe/Dublin so that it observes Irish Standard Time (UT 2135 +01) in summer and GMT (as negative daylight-saving) in winter, 2136 instead of observing standard time (GMT) in winter and Irish 2137 Summer Time (UT +01) in summer. This change does not affect UT 2138 offsets or abbreviations; it affects only whether timestamps are 2139 considered to be standard time or daylight-saving time, as 2140 expressed in the tm_isdst flag of C's struct tm type. 2141 (Discrepancy noted by Derick Rethans.) 2142 2143 Changes to build procedure 2144 2145 The default installation locations have been changed to mostly 2146 match Debian circa 2017, instead of being designed as an add-on to 2147 4.3BSD circa 1986. This affects the Makefile macros TOPDIR, 2148 TZDIR, MANDIR, and LIBDIR. New Makefile macros TZDEFAULT, USRDIR, 2149 USRSHAREDIR, BINDIR, ZDUMPDIR, and ZICDIR let installers tailor 2150 locations more precisely. (This responds to suggestions from 2151 Brian Inglis and from Steve Summit.) 2152 2153 The default installation procedure no longer creates the 2154 backward-compatibility link US/Pacific-New, which causes 2155 confusion during user setup (e.g., see Debian bug 815200). 2156 Use 'make BACKWARD="backward pacificnew"' to create the link 2157 anyway, for now. Eventually we plan to remove the link entirely. 2158 2159 tzdata.zi now contains a version-number comment. 2160 (Suggested by Tom Lane.) 2161 2162 The Makefile now quotes values like BACKWARD more carefully when 2163 passing them to the shell. (Problem reported by Zefram.) 2164 2165 Builders no longer need to specify -DHAVE_SNPRINTF on platforms 2166 that have snprintf and use pre-C99 compilers. (Problem reported 2167 by Jon Skeet.) 2168 2169 Changes to code 2170 2171 zic has a new option -t FILE that specifies the location of the 2172 file that determines local time when TZ is unset. The default for 2173 this location can be configured via the new TZDEFAULT makefile 2174 macro, which defaults to /etc/localtime. 2175 2176 Diagnostics and commentary now distinguish UT from UTC more 2177 carefully; see theory.html for more information about UT vs UTC. 2178 2179 zic has been ported to GCC 8's -Wstringop-truncation option. 2180 (Problem reported by Martin Sebor.) 2181 2182 Changes to documentation and commentary 2183 2184 The zic man page now documents the longstanding behavior that 2185 times and years can be out of the usual range, with negative times 2186 counting backwards from midnight and with year 0 preceding year 1. 2187 (Problem reported by Michael Deckers.) 2188 2189 The theory.html file now mentions the POSIX limit of six chars 2190 per abbreviation, and lists alphabetic abbreviations used. 2191 2192 The files tz-art.htm and tz-link.htm have been renamed to 2193 tz-art.html and tz-link.html, respectively, for consistency with 2194 other file names and to simplify web server configuration. 2195 2196 2197 Release 2017c - 2017-10-20 14:49:34 -0700 2198 2199 Briefly: 2200 Northern Cyprus switches from +03 to +02/+03 on 2017-10-29. 2201 Fiji ends DST 2018-01-14, not 2018-01-21. 2202 Namibia switches from +01/+02 to +02 on 2018-04-01. 2203 Sudan switches from +03 to +02 on 2017-11-01. 2204 Tonga likely switches from +13/+14 to +13 on 2017-11-05. 2205 Turks & Caicos switches from -04 to -05/-04 on 2018-11-04. 2206 A new file tzdata.zi now holds a small text copy of all data. 2207 The zic input format has been regularized slightly. 2208 2209 Changes to future timestamps 2210 2211 Northern Cyprus has decided to resume EU rules starting 2212 2017-10-29, thus reinstituting winter time. 2213 2214 Fiji ends DST 2018-01-14 instead of the 2018-01-21 previously 2215 predicted. (Thanks to Dominic Fok.) Adjust future predictions 2216 accordingly. 2217 2218 Namibia will switch from +01 with DST to +02 all year on 2219 2017-09-03 at 02:00. This affects UT offsets starting 2018-04-01 2220 at 02:00. (Thanks to Steffen Thorsen.) 2221 2222 Sudan will switch from +03 to +02 on 2017-11-01. (Thanks to Ahmed 2223 Atyya and Yahia Abdalla.) South Sudan is not switching, so 2224 Africa/Juba is no longer a link to Africa/Khartoum. 2225 2226 Tonga has likely ended its experiment with DST, and will not 2227 adjust its clocks on 2017-11-05. Although Tonga has not announced 2228 whether it will continue to observe DST, the IATA is assuming that 2229 it will not. (Thanks to David Wade.) 2230 2231 Turks & Caicos will switch from -04 all year to -05 with US DST on 2232 2018-03-11 at 03:00. This affects UT offsets starting 2018-11-04 2233 at 02:00. (Thanks to Steffen Thorsen.) 2234 2235 Changes to past timestamps 2236 2237 Namibia switched from +02 to +01 on 1994-03-21, not 1994-04-03. 2238 (Thanks to Arthur David Olson.) 2239 2240 Detroit did not observe DST in 1967. 2241 2242 Use railway time for Asia/Kolkata before 1941, by switching to 2243 Madras local time (UT +052110) in 1870, then to IST (UT +0530) in 2244 1906. Also, treat 1941-2's +0630 as DST, like 1942-5. 2245 2246 Europe/Dublin's 1946 and 1947 fallback transitions occurred at 2247 02:00 standard time, not 02:00 DST. (Thanks to Michael Deckers.) 2248 2249 Pacific/Apia and Pacific/Pago_Pago switched from Antipodean to 2250 American time in 1892, not 1879. (Thanks to Michael Deckers.) 2251 2252 Adjust the 1867 transition in Alaska to better reflect the 2253 historical record, by changing it to occur on 1867-10-18 at 15:30 2254 Sitka time rather than at the start of 1867-10-17 local time. 2255 Although strictly speaking this is accurate only for Sitka, 2256 the rest of Alaska's blanks need to be filled in somehow. 2257 2258 Fix off-by-one errors in UT offsets for Adak and Nome before 1867. 2259 (Thanks to Michael Deckers.) 2260 2261 Add 7 s to the UT offset in Asia/Yangon before 1920. 2262 2263 Changes to zone names 2264 2265 Remove Canada/East-Saskatchewan from the 'backward' file, as it 2266 exceeded the 14-character limit and was an unused misnomer anyway. 2267 2268 Changes to build procedure 2269 2270 To support applications that prefer to read time zone data in text 2271 form, two zic input files tzdata.zi and leapseconds are now 2272 installed by default. The commands 'zic tzdata.zi' and 'zic -L 2273 leapseconds tzdata.zi' can reproduce the tzdata binary files 2274 without and with leap seconds, respectively. To prevent these two 2275 new files from being installed, use 'make TZDATA_TEXT=', and to 2276 suppress leap seconds from the tzdata text installation, use 'make 2277 TZDATA_TEXT=tzdata.zi'. 2278 2279 'make BACKWARD=' now suppresses backward-compatibility names 2280 like 'US/Pacific' that are defined in the 'backward' and 2281 'pacificnew' files. 2282 2283 'make check' now works on systems that lack a UTF-8 locale, 2284 or that lack the nsgmls program. Set UTF8_LOCALE to configure 2285 the name of a UTF-8 locale, if you have one. 2286 2287 Y2K runtime checks are no longer enabled by default. Add 2288 -DDEPRECATE_TWO_DIGIT_YEARS to CFLAGS to enable them, instead of 2289 adding -DNO_RUN_TIME_WARNINGS_ABOUT_YEAR_2000_PROBLEMS_THANK_YOU 2290 to disable them. (New name suggested by Brian Inglis.) 2291 2292 The build procedure for zdump now works on AIX 7.1. 2293 (Problem reported by Kees Dekker.) 2294 2295 Changes to code 2296 2297 zic and the reference runtime now reject multiple leap seconds 2298 within 28 days of each other, or leap seconds before the Epoch. 2299 As a result, support for double leap seconds, which was 2300 obsolescent and undocumented, has been removed. Double leap 2301 seconds were an error in the C89 standard; they have never existed 2302 in civil timekeeping. (Thanks to Robert Elz and Bradley White for 2303 noticing glitches in the code that uncovered this problem.) 2304 2305 zic now warns about use of the obsolescent and undocumented -y 2306 option, and about use of the obsolescent TYPE field of Rule lines. 2307 2308 zic now allows unambiguous abbreviations like "Sa" and "Su" for 2309 weekdays; formerly it rejected them due to a bug. Conversely, zic 2310 no longer considers non-prefixes to be abbreviations; for example, 2311 it no longer accepts "lF" as an abbreviation for "lastFriday". 2312 Also, zic warns about the undocumented usage with a "last-" 2313 prefix, e.g., "last-Fri". 2314 2315 Similarly, zic now accepts the unambiguous abbreviation "L" for 2316 "Link" in ordinary context and for "Leap" in leap-second context. 2317 Conversely, zic no longer accepts non-prefixes such as "La" as 2318 abbreviations for words like "Leap". 2319 2320 zic no longer accepts leap second lines in ordinary input, or 2321 ordinary lines in leap second input. Formerly, zic sometimes 2322 warned about this undocumented usage and handled it incorrectly. 2323 2324 The new macro HAVE_TZNAME governs whether the tzname external 2325 variable is exported, instead of USG_COMPAT. USG_COMPAT now 2326 governs only the external variables "timezone" and "daylight". 2327 This change is needed because the three variables are not in the 2328 same category: although POSIX requires tzname, it specifies the 2329 other two variables as optional. Also, USG_COMPAT is now 1 or 0: 2330 if not defined, the code attempts to guess it from other macros. 2331 2332 localtime.c and difftime.c no longer require stdio.h, and .c files 2333 other than zic.c no longer require sys/wait.h. 2334 2335 zdump.c no longer assumes snprintf. (Reported by Jonathan Leffler.) 2336 2337 Calculation of time_t extrema works around a bug in GCC 4.8.4 2338 (Reported by Stan Shebs and Joseph Myers.) 2339 2340 zic.c no longer mistranslates formats of line numbers in non-English 2341 locales. (Problem reported by Benno Schulenberg.) 2342 2343 Several minor changes have been made to the code to make it a 2344 bit easier to port to MS-Windows and Solaris. (Thanks to Kees 2345 Dekker for reporting the problems.) 2346 2347 Changes to documentation and commentary 2348 2349 The two new files 'theory.html' and 'calendars' contain the 2350 contents of the removed file 'Theory'. The goal is to document 2351 tzdb theory more accessibly. 2352 2353 The zic man page now documents abbreviation rules. 2354 2355 tz-link.htm now covers how to apply tzdata changes to clients. 2356 (Thanks to Jorge Fbregas for the AIX link.) It also mentions MySQL. 2357 2358 The leap-seconds.list URL has been updated to something that is 2359 more reliable for tzdb. (Thanks to Tim Parenti and Brian Inglis.) 2360 2361 Release 2017b - 2017-03-17 07:30:38 -0700 2362 2363 Briefly: Haiti has resumed DST. 2364 2365 Changes to past and future timestamps 2366 2367 Haiti resumed observance of DST in 2017. (Thanks to Steffen Thorsen.) 2368 2369 Changes to past timestamps 2370 2371 Liberia changed from -004430 to +00 on 1972-01-07, not 1972-05-01. 2372 2373 Use "MMT" to abbreviate Liberia's time zone before 1972, as "-004430" 2374 is one byte over the POSIX limit. (Problem reported by Derick Rethans.) 2375 2376 Changes to code 2377 2378 The reference localtime implementation now falls back on the 2379 current US daylight-saving transition rules rather than the 2380 1987-2006 rules. This fallback occurs only when (1) the TZ 2381 environment variable has a value like "AST4ADT" that asks 2382 for daylight saving time but does not specify the rules, (2) there 2383 is no file by that name, and (3) the TZDEFRULES file cannot be 2384 loaded. (Thanks to Tom Lane.) 2385 2386 2387 Release 2017a - 2017-02-28 00:05:36 -0800 2388 2389 Briefly: Southern Chile moves from -04/-03 to -03, and Mongolia 2390 discontinues DST. 2391 2392 Changes to future timestamps 2393 2394 Mongolia no longer observes DST. (Thanks to Ganbold Tsagaankhuu.) 2395 2396 Chile's Region of Magallanes moves from -04/-03 to -03 year-round. 2397 Its clocks diverge from America/Santiago starting 2017-05-13 at 2398 23:00, hiving off a new zone America/Punta_Arenas. Although the 2399 Chilean government says this change expires in May 2019, for now 2400 assume it's permanent. (Thanks to Juan Correa and Deborah 2401 Goldsmith.) This also affects Antarctica/Palmer. 2402 2403 Changes to past timestamps 2404 2405 Fix many entries for historical timestamps for Europe/Madrid 2406 before 1979, to agree with tables compiled by Pere Planesas of the 2407 National Astronomical Observatory of Spain. As a side effect, 2408 this changes some timestamps for Africa/Ceuta before 1929, which 2409 are probably guesswork anyway. (Thanks to Steve Allen and 2410 Pierpaolo Bernardi for the heads-ups, and to Michael Deckers for 2411 correcting the 1901 transition.) 2412 2413 Ecuador observed DST from 1992-11-28 to 1993-02-05. 2414 (Thanks to Alois Treindl.) 2415 2416 Asia/Atyrau and Asia/Oral were at +03 (not +04) before 1930-06-21. 2417 (Thanks to Stepan Golosunov.) 2418 2419 Changes to past and future time zone abbreviations 2420 2421 Switch to numeric time zone abbreviations for South America, as 2422 part of the ongoing project of removing invented abbreviations. 2423 This avoids the need to invent an abbreviation for the new Chilean 2424 new zone. Similarly, switch from invented to numeric time zone 2425 abbreviations for Afghanistan, American Samoa, the Azores, 2426 Bangladesh, Bhutan, the British Indian Ocean Territory, Brunei, 2427 Cape Verde, Chatham Is, Christmas I, Cocos (Keeling) Is, Cook Is, 2428 Dubai, East Timor, Eucla, Fiji, French Polynesia, Greenland, 2429 Indochina, Iran, Iraq, Kiribati, Lord Howe, Macquarie, Malaysia, 2430 the Maldives, Marshall Is, Mauritius, Micronesia, Mongolia, 2431 Myanmar, Nauru, Nepal, New Caledonia, Niue, Norfolk I, Palau, 2432 Papua New Guinea, the Philippines, Pitcairn, Qatar, Runion, St 2433 Pierre & Miquelon, Samoa, Saudi Arabia, Seychelles, Singapore, 2434 Solomon Is, Tokelau, Tuvalu, Wake, Vanuatu, Wallis & Futuna, and 2435 Xinjiang; for 20-minute daylight saving time in Ghana before 1943; 2436 for half-hour daylight saving time in Belize before 1944 and in 2437 the Dominican Republic before 1975; and for Canary Islands before 2438 1946, for Guinea-Bissau before 1975, for Iceland before 1969, for 2439 Indian Summer Time before 1942, for Indonesia before around 1964, 2440 for Kenya before 1960, for Liberia before 1973, for Madeira before 2441 1967, for Namibia before 1943, for the Netherlands in 1937-9, for 2442 Pakistan before 1971, for Western Sahara before 1977, and for 2443 Zaporozhye in 1880-1924. 2444 2445 For Alaska time from 1900 through 1967, instead of "CAT" use the 2446 abbreviation "AST", the abbreviation commonly used at the time 2447 (Atlantic Standard Time had not been standardized yet). Use "AWT" 2448 and "APT" instead of the invented abbreviations "CAWT" and "CAPT". 2449 2450 Use "CST" and "CDT" instead of invented abbreviations for Macau 2451 before 1999 and Taiwan before 1938, and use "JST" instead of the 2452 invented abbreviation "JCST" for Japan and Korea before 1938. 2453 2454 Change to database entry category 2455 2456 Move the Pacific/Johnston link from 'australasia' to 'backward', 2457 since Johnston is now uninhabited. 2458 2459 Changes to code 2460 2461 zic no longer mishandles some transitions in January 2038 when it 2462 attempts to work around Qt bug 53071. This fixes a bug affecting 2463 Pacific/Tongatapu that was introduced in zic 2016e. localtime.c 2464 now contains a workaround, useful when loading a file generated by 2465 a buggy zic. (Problem and localtime.c fix reported by Bradley 2466 White.) 2467 2468 zdump -i now outputs non-hour numeric time zone abbreviations 2469 without a colon, e.g., "+0530" rather than "+05:30". This agrees 2470 with zic %z and with common practice, and simplifies auditing of 2471 zdump output. 2472 2473 zdump is now buildable again with -DUSE_LTZ=0. 2474 (Problem reported by Joseph Myers.) 2475 2476 zdump.c now always includes private.h, to avoid code duplication 2477 with private.h. (Problem reported by Kees Dekker.) 2478 2479 localtime.c no longer mishandles early or late timestamps 2480 when TZ is set to a POSIX-style string that specifies DST. 2481 (Problem reported by Kees Dekker.) 2482 2483 date and strftime now cause %z to generate "-0000" instead of 2484 "+0000" when the UT offset is zero and the time zone abbreviation 2485 begins with "-". 2486 2487 Changes to documentation and commentary 2488 2489 The 'Theory' file now better documents choice of historical time 2490 zone abbreviations. (Problems reported by Michael Deckers.) 2491 2492 tz-link.htm now covers leap smearing, which is popular in clouds. 2493 2494 2495 Release 2016j - 2016-11-22 23:17:13 -0800 2496 2497 Briefly: Saratov, Russia moves from +03 to +04 on 2016-12-04. 2498 2499 Changes to future timestamps 2500 2501 Saratov, Russia switches from +03 to +04 on 2016-12-04 at 02:00. 2502 This hives off a new zone Europe/Saratov from Europe/Volgograd. 2503 (Thanks to Yuri Konotopov and Stepan Golosunov.) 2504 2505 Changes to past timestamps 2506 2507 The new zone Asia/Atyrau for Atyra Region, Kazakhstan, is like 2508 Asia/Aqtau except it switched from +05/+06 to +04/+05 in spring 2509 1999, not fall 1994. (Thanks to Stepan Golosunov.) 2510 2511 Changes to past time zone abbreviations 2512 2513 Asia/Gaza and Asia/Hebron now use "EEST", not "EET", to denote 2514 summer time before 1948. The old use of "EET" was a typo. 2515 2516 Changes to code 2517 2518 zic no longer mishandles file systems that lack hard links, fixing 2519 bugs introduced in 2016g. (Problems reported by Tom Lane.) 2520 Also, when the destination already contains symbolic links, zic 2521 should now work better on systems where the 'link' system call 2522 does not follow symbolic links. 2523 2524 Changes to documentation and commentary 2525 2526 tz-link.htm now documents the relationship between release version 2527 numbers and development-repository commit tags. (Suggested by 2528 Paul Koning.) 2529 2530 The 'Theory' file now documents UT. 2531 2532 iso3166.tab now accents "Curaao", and commentary now mentions 2533 the names "Cabo Verde" and "Czechia". (Thanks to Ji Boh.) 2534 2535 2536 Release 2016i - 2016-11-01 23:19:52 -0700 2537 2538 Briefly: Cyprus split into two time zones on 2016-10-30, and Tonga 2539 reintroduces DST on 2016-11-06. 2540 2541 Changes to future timestamps 2542 2543 Pacific/Tongatapu begins DST on 2016-11-06 at 02:00, ending on 2544 2017-01-15 at 03:00. Assume future observances in Tonga will be 2545 from the first Sunday in November through the third Sunday in 2546 January, like Fiji. (Thanks to Pulu Anau.) Switch to numeric 2547 time zone abbreviations for this zone. 2548 2549 Changes to past and future timestamps 2550 2551 Northern Cyprus is now +03 year round, causing a split in Cyprus 2552 time zones starting 2016-10-30 at 04:00. This creates a zone 2553 Asia/Famagusta. (Thanks to Even Scharning and Matt Johnson.) 2554 2555 Antarctica/Casey switched from +08 to +11 on 2016-10-22. 2556 (Thanks to Steffen Thorsen.) 2557 2558 Changes to past timestamps 2559 2560 Several corrections were made for pre-1975 timestamps in Italy. 2561 These affect Europe/Malta, Europe/Rome, Europe/San_Marino, and 2562 Europe/Vatican. 2563 2564 First, the 1893-11-01 00:00 transition in Italy used the new UT 2565 offset (+01), not the old (+00:49:56). (Thanks to Michael 2566 Deckers.) 2567 2568 Second, rules for daylight saving in Italy were changed to agree 2569 with Italy's National Institute of Metrological Research (INRiM) 2570 except for 1944, as follows (thanks to Pierpaolo Bernardi, Brian 2571 Inglis, and Michael Deckers): 2572 2573 The 1916-06-03 transition was at 24:00, not 00:00. 2574 2575 The 1916-10-01, 1919-10-05, and 1920-09-19 transitions were at 2576 00:00, not 01:00. 2577 2578 The 1917-09-30 and 1918-10-06 transitions were at 24:00, not 2579 01:00. 2580 2581 The 1944-09-17 transition was at 03:00, not 01:00. This 2582 particular change is taken from Italian law as INRiM's table, 2583 (which says 02:00) appears to have a typo here. Also, keep the 2584 1944-04-03 transition for Europe/Rome, as Rome was controlled by 2585 Germany then. 2586 2587 The 1967-1970 and 1972-1974 fallback transitions were at 01:00, 2588 not 00:00. 2589 2590 Changes to code 2591 2592 The code should now be buildable on AmigaOS merely by setting the 2593 appropriate Makefile variables. (From a patch by Carsten Larsen.) 2594 2595 2596 Release 2016h - 2016-10-19 23:17:57 -0700 2597 2598 Changes to future timestamps 2599 2600 Asia/Gaza and Asia/Hebron end DST on 2016-10-29 at 01:00, not 2601 2016-10-21 at 00:00. (Thanks to Sharef Mustafa.) Predict that 2602 future fall transitions will be on the last Saturday of October 2603 at 01:00, which is consistent with predicted spring transitions 2604 on the last Saturday of March. (Thanks to Tim Parenti.) 2605 2606 Changes to past timestamps 2607 2608 In Turkey, transitions in 1986-1990 were at 01:00 standard time 2609 not at 02:00, and the spring 1994 transition was on March 20, not 2610 March 27. (Thanks to Kvan Yazan.) 2611 2612 Changes to past and future time zone abbreviations 2613 2614 Asia/Colombo now uses numeric time zone abbreviations like "+0530" 2615 instead of alphabetic ones like "IST" and "LKT". Various 2616 English-language sources use "IST", "LKT" and "SLST", with no 2617 working consensus. (Usage of "SLST" mentioned by Sadika 2618 Sumanapala.) 2619 2620 Changes to code 2621 2622 zic no longer mishandles relativizing file names when creating 2623 symbolic links like /etc/localtime, when these symbolic links 2624 are outside the usual directory hierarchy. This fixes a bug 2625 introduced in 2016g. (Problem reported by Andreas Stieger.) 2626 2627 Changes to build procedure 2628 2629 New rules 'traditional_tarballs' and 'traditional_signatures' for 2630 building just the traditional-format distribution. (Requested by 2631 Deborah Goldsmith.) 2632 2633 The file 'version' is now put into the tzdata tarball too. 2634 (Requested by Howard Hinnant.) 2635 2636 Changes to documentation and commentary 2637 2638 The 'Theory' file now has a section on interface stability. 2639 (Requested by Paul Koning.) It also mentions features like 2640 tm_zone and localtime_rz that have long been supported by the 2641 reference code. 2642 2643 tz-link.htm has improved coverage of time zone boundaries suitable 2644 for geolocation. (Thanks to heads-ups from Evan Siroky and Matt 2645 Johnson.) 2646 2647 The US commentary now mentions Allen and the "day of two noons". 2648 2649 The Fiji commentary mentions the government's 2016-10-03 press 2650 release. (Thanks to Raymond Kumar.) 2651 2652 2653 Release 2016g - 2016-09-13 08:56:38 -0700 2654 2655 Changes to future timestamps 2656 2657 Turkey switched from EET/EEST (+02/+03) to permanent +03, 2658 effective 2016-09-07. (Thanks to Burak AYDIN.) Use "+03" rather 2659 than an invented abbreviation for the new time. 2660 2661 New leap second 2016-12-31 23:59:60 UTC as per IERS Bulletin C 52. 2662 (Thanks to Tim Parenti.) 2663 2664 Changes to past timestamps 2665 2666 For America/Los_Angeles, spring-forward transition times have been 2667 corrected from 02:00 to 02:01 in 1948, and from 02:00 to 01:00 in 2668 1950-1966. 2669 2670 For zones using Soviet time on 1919-07-01, transitions to UT-based 2671 time were at 00:00 UT, not at 02:00 local time. The affected 2672 zones are Europe/Kirov, Europe/Moscow, Europe/Samara, and 2673 Europe/Ulyanovsk. (Thanks to Alexander Belopolsky.) 2674 2675 Changes to past and future time zone abbreviations 2676 2677 The Factory zone now uses the time zone abbreviation -00 instead 2678 of a long English-language string, as -00 is now the normal way to 2679 represent an undefined time zone. 2680 2681 Several zones in Antarctica and the former Soviet Union, along 2682 with zones intended for ships at sea that cannot use POSIX TZ 2683 strings, now use numeric time zone abbreviations instead of 2684 invented or obsolete alphanumeric abbreviations. The affected 2685 zones are Antarctica/Casey, Antarctica/Davis, 2686 Antarctica/DumontDUrville, Antarctica/Mawson, Antarctica/Rothera, 2687 Antarctica/Syowa, Antarctica/Troll, Antarctica/Vostok, 2688 Asia/Anadyr, Asia/Ashgabat, Asia/Baku, Asia/Bishkek, Asia/Chita, 2689 Asia/Dushanbe, Asia/Irkutsk, Asia/Kamchatka, Asia/Khandyga, 2690 Asia/Krasnoyarsk, Asia/Magadan, Asia/Omsk, Asia/Sakhalin, 2691 Asia/Samarkand, Asia/Srednekolymsk, Asia/Tashkent, Asia/Tbilisi, 2692 Asia/Ust-Nera, Asia/Vladivostok, Asia/Yakutsk, Asia/Yekaterinburg, 2693 Asia/Yerevan, Etc/GMT-14, Etc/GMT-13, Etc/GMT-12, Etc/GMT-11, 2694 Etc/GMT-10, Etc/GMT-9, Etc/GMT-8, Etc/GMT-7, Etc/GMT-6, Etc/GMT-5, 2695 Etc/GMT-4, Etc/GMT-3, Etc/GMT-2, Etc/GMT-1, Etc/GMT+1, Etc/GMT+2, 2696 Etc/GMT+3, Etc/GMT+4, Etc/GMT+5, Etc/GMT+6, Etc/GMT+7, Etc/GMT+8, 2697 Etc/GMT+9, Etc/GMT+10, Etc/GMT+11, Etc/GMT+12, Europe/Kaliningrad, 2698 Europe/Minsk, Europe/Samara, Europe/Volgograd, and 2699 Indian/Kerguelen. For Europe/Moscow the invented abbreviation MSM 2700 was replaced by +05, whereas MSK and MSD were kept as they are not 2701 our invention and are widely used. 2702 2703 Changes to zone names 2704 2705 Rename Asia/Rangoon to Asia/Yangon, with a backward compatibility link. 2706 (Thanks to David Massoud.) 2707 2708 Changes to code 2709 2710 zic no longer generates binary files containing POSIX TZ-like 2711 strings that disagree with the local time type after the last 2712 explicit transition in the data. This fixes a bug with 2713 Africa/Casablanca and Africa/El_Aaiun in some year-2037 timestamps 2714 on the reference platform. (Thanks to Alexander Belopolsky for 2715 reporting the bug and suggesting a way forward.) 2716 2717 If the installed localtime and/or posixrules files are symbolic 2718 links, zic now keeps them symbolic links when updating them, for 2719 compatibility with platforms like OpenSUSE where other programs 2720 configure these files as symlinks. 2721 2722 zic now avoids hard linking to symbolic links, avoids some 2723 unnecessary mkdir and stat system calls, and uses shorter file 2724 names internally. 2725 2726 zdump has a new -i option to generate transitions in a 2727 smaller but still human-readable format. This option is 2728 experimental, and the output format may change in future versions. 2729 (Thanks to Jon Skeet for suggesting that an option was needed, 2730 and thanks to Tim Parenti and Chris Rovick for further comments.) 2731 2732 Changes to build procedure 2733 2734 An experimental distribution format is available, in addition 2735 to the traditional format which will continue to be distributed. 2736 The new format is a tarball tzdb-VERSION.tar.lz with signature 2737 file tzdb-VERSION.tar.lz.asc. It unpacks to a top-level directory 2738 tzdb-VERSION containing the code and data of the traditional 2739 two-tarball format, along with extra data that may be useful. 2740 (Thanks to Antonio Diaz Diaz, Oscar van Vlijmen, and many others 2741 for comments about the experimental format.) 2742 2743 The release version number is now more accurate in the usual case 2744 where releases are built from a Git repository. For example, if 2745 23 commits and some working-file changes have been made since 2746 release 2016g, the version number is now something like 2747 '2016g-23-g50556e3-dirty' instead of the misleading '2016g'. 2748 Tagged releases use the same version number format as before, 2749 e.g., '2016g'. To support the more accurate version number, its 2750 specification has moved from a line in the Makefile to a new 2751 source file 'version'. 2752 2753 The experimental distribution contains a file to2050.tzs that 2754 contains what should be the output of 'zdump -i -c 2050' on 2755 primary zones. If this file is available, 'make check' now checks 2756 that zdump generates this output. 2757 2758 'make check_web' now works on Fedora-like distributions. 2759 2760 Changes to documentation and commentary 2761 2762 tzfile.5 now documents the new restriction on POSIX TZ-like 2763 strings that is now implemented by zic. 2764 2765 Comments now cite URLs for some 1917-1921 Russian DST decrees. 2766 (Thanks to Alexander Belopolsky.) 2767 2768 tz-link.htm mentions JuliaTime (thanks to Curtis Vogt) and Time4J 2769 (thanks to Meno Hochschild) and ThreeTen-Extra, and its 2770 description of Java 8 has been brought up to date (thanks to 2771 Stephen Colebourne). Its description of local time on Mars has 2772 been updated to match current practice, and URLs have been updated 2773 and some obsolete ones removed. 2774 2775 2776 Release 2016f - 2016-07-05 16:26:51 +0200 2777 2778 Changes affecting future timestamps 2779 2780 The Egyptian government changed its mind on short notice, and 2781 Africa/Cairo will not introduce DST starting 2016-07-07 after all. 2782 (Thanks to Mina Samuel.) 2783 2784 Asia/Novosibirsk switches from +06 to +07 on 2016-07-24 at 02:00. 2785 (Thanks to Stepan Golosunov.) 2786 2787 Changes to past and future timestamps 2788 2789 Asia/Novokuznetsk and Asia/Novosibirsk now use numeric time zone 2790 abbreviations instead of invented ones. 2791 2792 Changes affecting past timestamps 2793 2794 Europe/Minsk's 1992-03-29 spring-forward transition was at 02:00 not 00:00. 2795 (Thanks to Stepan Golosunov.) 2796 2797 2798 Release 2016e - 2016-06-14 08:46:16 -0700 2799 2800 Changes affecting future timestamps 2801 2802 Africa/Cairo observes DST in 2016 from July 7 to the end of October. 2803 Guess October 27 and 24:00 transitions. (Thanks to Steffen Thorsen.) 2804 For future years, guess April's last Thursday to October's last 2805 Thursday except for Ramadan. 2806 2807 Changes affecting past timestamps 2808 2809 Locations while uninhabited now use '-00', not 'zzz', as a 2810 placeholder time zone abbreviation. This is inspired by Internet 2811 RFC 3339 and is more consistent with numeric time zone 2812 abbreviations already used elsewhere. The change affects several 2813 arctic and antarctic locations, e.g., America/Cambridge_Bay before 2814 1920 and Antarctica/Troll before 2005. 2815 2816 Asia/Baku's 1992-09-27 transition from +04 (DST) to +04 (non-DST) was 2817 at 03:00, not 23:00 the previous day. (Thanks to Michael Deckers.) 2818 2819 Changes to code 2820 2821 zic now outputs a dummy transition at time 2**31 - 1 in zones 2822 whose POSIX-style TZ strings contain a '<'. This mostly works 2823 around Qt bug 53071 <https://bugreports.qt.io/browse/QTBUG-53071>. 2824 (Thanks to Zhanibek Adilbekov for reporting the Qt bug.) 2825 2826 Changes affecting documentation and commentary 2827 2828 tz-link.htm says why governments should give plenty of notice for 2829 time zone or DST changes, and refers to Matt Johnson's blog post. 2830 2831 tz-link.htm mentions Tzdata for Elixir. (Thanks to Matt Johnson.) 2832 2833 2834 Release 2016d - 2016-04-17 22:50:29 -0700 2835 2836 Changes affecting future timestamps 2837 2838 America/Caracas switches from -0430 to -04 on 2016-05-01 at 02:30. 2839 (Thanks to Alexander Krivenyshev for the heads-up.) 2840 2841 Asia/Magadan switches from +10 to +11 on 2016-04-24 at 02:00. 2842 (Thanks to Alexander Krivenyshev and Matt Johnson.) 2843 2844 New zone Asia/Tomsk, split off from Asia/Novosibirsk. It covers 2845 Tomsk Oblast, Russia, which switches from +06 to +07 on 2016-05-29 2846 at 02:00. (Thanks to Stepan Golosunov.) 2847 2848 Changes affecting past timestamps 2849 2850 New zone Europe/Kirov, split off from Europe/Volgograd. It covers 2851 Kirov Oblast, Russia, which switched from +04/+05 to +03/+04 on 2852 1989-03-26 at 02:00, roughly a year after Europe/Volgograd made 2853 the same change. (Thanks to Stepan Golosunov.) 2854 2855 Russia and nearby locations had daylight-saving transitions on 2856 1992-03-29 at 02:00 and 1992-09-27 at 03:00, instead of on 2857 1992-03-28 at 23:00 and 1992-09-26 at 23:00. (Thanks to Stepan 2858 Golosunov.) 2859 2860 Many corrections to historical time in Kazakhstan from 1991 2861 through 2005. (Thanks to Stepan Golosunov.) Replace Kazakhstan's 2862 invented time zone abbreviations with numeric abbreviations. 2863 2864 Changes to commentary 2865 2866 Mention Internet RFCs 7808 (TZDIST) and 7809 (CalDAV time zone references). 2867 2868 2869 Release 2016c - 2016-03-23 00:51:27 -0700 2870 2871 Changes affecting future timestamps 2872 2873 Azerbaijan no longer observes DST. (Thanks to Steffen Thorsen.) 2874 2875 Chile reverts from permanent to seasonal DST. (Thanks to Juan 2876 Correa for the heads-up, and to Tim Parenti for corrections.) 2877 Guess that future transitions are August's and May's second 2878 Saturdays at 24:00 mainland time. Also, call the period from 2879 2014-09-07 through 2016-05-14 daylight saving time instead of 2880 standard time, as that seems more appropriate now. 2881 2882 Changes affecting past timestamps 2883 2884 Europe/Kaliningrad and Europe/Vilnius changed from +03/+04 to 2885 +02/+03 on 1989-03-26, not 1991-03-31. Europe/Volgograd changed 2886 from +04/+05 to +03/+04 on 1988-03-27, not 1989-03-26. 2887 (Thanks to Stepan Golosunov.) 2888 2889 Changes to commentary 2890 2891 Several updates and URLs for historical and proposed Russian changes. 2892 (Thanks to Stepan Golosunov, Matt Johnson, and Alexander Krivenyshev.) 2893 2894 2895 Release 2016b - 2016-03-12 17:30:14 -0800 2896 2897 Compatibility note 2898 2899 Starting with release 2016b, some data entries cause zic implementations 2900 derived from tz releases 2005j through 2015e to issue warnings like 2901 "time zone abbreviation differs from POSIX standard (+03)". 2902 These warnings should not otherwise affect zic's output and can safely be 2903 ignored on today's platforms, as the warnings refer to a restriction in 2904 POSIX.1-1988 that was removed in POSIX.1-2001. One way to suppress the 2905 warnings is to upgrade to zic derived from tz releases 2015f and later. 2906 2907 Changes affecting future timestamps 2908 2909 New zones Europe/Astrakhan and Europe/Ulyanovsk for Astrakhan and 2910 Ulyanovsk Oblasts, Russia, both of which will switch from +03 to +04 on 2911 2016-03-27 at 02:00 local time. They need distinct zones since their 2912 post-1970 histories disagree. New zone Asia/Barnaul for Altai Krai and 2913 Altai Republic, Russia, which will switch from +06 to +07 on the same date 2914 and local time. The Astrakhan change is already official; the others have 2915 passed the first reading in the State Duma and are extremely likely. 2916 Also, Asia/Sakhalin moves from +10 to +11 on 2016-03-27 at 02:00. 2917 (Thanks to Alexander Krivenyshev for the heads-up, and to Matt Johnson 2918 and Stepan Golosunov for followup.) 2919 2920 As a trial of a new system that needs less information to be made up, 2921 the new zones use numeric time zone abbreviations like "+04" 2922 instead of invented abbreviations like "ASTT". 2923 2924 Haiti will not observe DST in 2016. (Thanks to Jean Antoine via 2925 Steffen Thorsen.) 2926 2927 Palestine's spring-forward transition on 2016-03-26 is at 01:00, not 00:00. 2928 (Thanks to Hannah Kreitem.) Guess future transitions will be March's last 2929 Saturday at 01:00, not March's last Friday at 24:00. 2930 2931 Changes affecting past timestamps 2932 2933 Europe/Chisinau observed DST during 1990, and switched from +04 to 2934 +03 at 1990-05-06 02:00, instead of switching from +03 to +02. 2935 (Thanks to Stepan Golosunov.) 2936 2937 1991 abbreviations in Europe/Samara should be SAMT/SAMST, not 2938 KUYT/KUYST. (Thanks to Stepan Golosunov.) 2939 2940 Changes to code 2941 2942 tzselect's diagnostics and checking, and checktab.awk's checking, 2943 have been improved. (Thanks to J William Piggott.) 2944 2945 tzcode now builds under MinGW. (Thanks to Ian Abbott and Esben Haabendal.) 2946 2947 tzselect now tests Julian-date TZ settings more accurately. 2948 (Thanks to J William Piggott.) 2949 2950 Changes to commentary 2951 2952 Comments in zone tables have been improved. (Thanks to J William Piggott.) 2953 2954 tzselect again limits its menu comments so that menus fit on a 2955 2480 alphanumeric display. 2956 2957 A new web page tz-how-to.html. (Thanks to Bill Seymour.) 2958 2959 In the Theory file, the description of possible time zone abbreviations in 2960 tzdata has been cleaned up, as the old description was unclear and 2961 inconsistent. (Thanks to Alain Mouette for reporting the problem.) 2962 2963 2964 Release 2016a - 2016-01-26 23:28:02 -0800 2965 2966 Changes affecting future timestamps 2967 2968 America/Cayman will not observe daylight saving this year after all. 2969 Revert our guess that it would. (Thanks to Matt Johnson.) 2970 2971 Asia/Chita switches from +0800 to +0900 on 2016-03-27 at 02:00. 2972 (Thanks to Alexander Krivenyshev.) 2973 2974 Asia/Tehran now has DST predictions for the year 2038 and later, 2975 to be March 21 00:00 to September 21 00:00. This is likely better 2976 than predicting no DST, albeit off by a day every now and then. 2977 2978 Changes affecting past and future timestamps 2979 2980 America/Metlakatla switched from PST all year to AKST/AKDT on 2981 2015-11-01 at 02:00. (Thanks to Steffen Thorsen.) 2982 2983 America/Santa_Isabel has been removed, and replaced with a 2984 backward compatibility link to America/Tijuana. Its contents were 2985 apparently based on a misreading of Mexican legislation. 2986 2987 Changes affecting past timestamps 2988 2989 Asia/Karachi's two transition times in 2002 were off by a minute. 2990 (Thanks to Matt Johnson.) 2991 2992 Changes affecting build procedure 2993 2994 An installer can now combine leap seconds with use of the backzone file, 2995 e.g., with 'make PACKRATDATA=backzone REDO=posix_right zones'. 2996 The old 'make posix_packrat' rule is now marked as obsolescent. 2997 (Thanks to Ian Abbott for an initial implementation.) 2998 2999 Changes affecting documentation and commentary 3000 3001 A new file LICENSE makes it easier to see that the code and data 3002 are mostly public-domain. (Thanks to James Knight.) The three 3003 non-public-domain files now use the current (3-clause) BSD license 3004 instead of older versions of that license. 3005 3006 tz-link.htm mentions the BDE library (thanks to Andrew Paprocki), 3007 CCTZ (thanks to Tim Parenti), TimeJones.com, and has a new section 3008 on editing tz source files (with a mention of Sublime zoneinfo, 3009 thanks to Gilmore Davidson). 3010 3011 The Theory and asia files now mention the 2015 book "The Global 3012 Transformation of Time, 1870-1950", and cite a couple of reviews. 3013 3014 The America/Chicago entry now documents the informal use of US 3015 central time in Fort Pierre, South Dakota. (Thanks to Rick 3016 McDermid, Matt Johnson, and Steve Jones.) 3017 3018 3019 Release 2015g - 2015-10-01 00:39:51 -0700 3020 3021 Changes affecting future timestamps 3022 3023 Turkey's 2015 fall-back transition is scheduled for Nov. 8, not Oct. 25. 3024 (Thanks to Fatih.) 3025 3026 Norfolk moves from +1130 to +1100 on 2015-10-04 at 02:00 local time. 3027 (Thanks to Alexander Krivenyshev.) 3028 3029 Fiji's 2016 fall-back transition is scheduled for January 17, not 24. 3030 (Thanks to Ken Rylander.) 3031 3032 Fort Nelson, British Columbia will not fall back on 2015-11-01. It has 3033 effectively been on MST (-0700) since it advanced its clocks on 2015-03-08. 3034 New zone America/Fort_Nelson. (Thanks to Matt Johnson.) 3035 3036 Changes affecting past timestamps 3037 3038 Norfolk observed DST from 1974-10-27 02:00 to 1975-03-02 02:00. 3039 3040 Changes affecting code 3041 3042 localtime no longer mishandles America/Anchorage after 2037. 3043 (Thanks to Bradley White for reporting the bug.) 3044 3045 On hosts with signed 32-bit time_t, localtime no longer mishandles 3046 Pacific/Fiji after 2038-01-16 14:00 UTC. 3047 3048 The localtime module allows the variables 'timezone', 'daylight', 3049 and 'altzone' to be in common storage shared with other modules, 3050 and declares them in case the system <time.h> does not. 3051 (Problems reported by Kees Dekker.) 3052 3053 On platforms with tm_zone, strftime.c now assumes it is not NULL. 3054 This simplifies the code and is consistent with zdump.c. 3055 (Problem reported by Christos Zoulas.) 3056 3057 Changes affecting documentation 3058 3059 The tzfile man page now documents that transition times denote the 3060 starts (not the ends) of the corresponding time periods. 3061 (Ambiguity reported by Bill Seymour.) 3062 3063 3064 Release 2015f - 2015-08-10 18:06:56 -0700 3065 3066 Changes affecting future timestamps 3067 3068 North Korea switches to +0830 on 2015-08-15. (Thanks to Steffen Thorsen.) 3069 The abbreviation remains "KST". (Thanks to Robert Elz.) 3070 3071 Uruguay no longer observes DST. (Thanks to Steffen Thorsen 3072 and Pablo Camargo.) 3073 3074 Changes affecting past and future timestamps 3075 3076 Moldova starts and ends DST at 00:00 UTC, not at 01:00 UTC. 3077 (Thanks to Roman Tudos.) 3078 3079 Changes affecting data format and code 3080 3081 zic's '-y YEARISTYPE' option is no longer documented. The TYPE 3082 field of a Rule line should now be '-'; the old values 'even', 3083 'odd', 'uspres', 'nonpres', 'nonuspres' were already undocumented. 3084 Although the implementation has not changed, these features do not 3085 work in the default installation, they are not used in the data, 3086 and they are now considered obsolescent. 3087 3088 zic now checks that two rules don't take effect at the same time. 3089 (Thanks to Jon Skeet and Arthur David Olson.) Constraints on 3090 simultaneity are now documented. 3091 3092 The two characters '%z' in a zone format now stand for the UT 3093 offset, e.g., '-07' for seven hours behind UT and '+0530' for 3094 five hours and thirty minutes ahead. This better supports time 3095 zone abbreviations conforming to POSIX.1-2001 and later. 3096 3097 Changes affecting installed data files 3098 3099 Comments for America/Halifax and America/Glace_Bay have been improved. 3100 (Thanks to Brian Inglis.) 3101 3102 Data entries have been simplified for Atlantic/Canary, Europe/Simferopol, 3103 Europe/Sofia, and Europe/Tallinn. This yields slightly smaller 3104 installed data files for Europe/Simferopol and Europe/Tallinn. 3105 It does not affect timestamps. (Thanks to Howard Hinnant.) 3106 3107 Changes affecting code 3108 3109 zdump and zic no longer warn about valid time zone abbreviations 3110 like '-05'. 3111 3112 Some Visual Studio 2013 warnings have been suppressed. 3113 (Thanks to Kees Dekker.) 3114 3115 'date' no longer sets the time of day and its -a, -d, -n and -t 3116 options have been removed. Long obsolescent, the implementation 3117 of these features had porting problems. Builders no longer need 3118 to configure HAVE_ADJTIME, HAVE_SETTIMEOFDAY, or HAVE_UTMPX_H. 3119 (Thanks to Kees Dekker for pointing out the problem.) 3120 3121 Changes affecting documentation 3122 3123 The Theory file mentions naming issues earlier, as these seem to be 3124 poorly publicized (thanks to Gilmore Davidson for reporting the problem). 3125 3126 tz-link.htm mentions Time Zone Database Parser (thanks to Howard Hinnant). 3127 3128 Mention that Herbert Samuel introduced the term "Summer Time". 3129 3130 3131 Release 2015e - 2015-06-13 10:56:02 -0700 3132 3133 Changes affecting future timestamps 3134 3135 Morocco will suspend DST from 2015-06-14 03:00 through 2015-07-19 02:00, 3136 not 06-13 and 07-18 as we had guessed. (Thanks to Milamber.) 3137 3138 Assume Cayman Islands will observe DST starting next year, using US rules. 3139 Although it isn't guaranteed, it is the most likely. 3140 3141 Changes affecting data format 3142 3143 The file 'iso3166.tab' now uses UTF-8, so that its entries can better 3144 spell the names of land Islands, Cte d'Ivoire, and Runion. 3145 3146 Changes affecting code 3147 3148 When displaying data, tzselect converts it to the current locale's 3149 encoding if the iconv command works. (Problem reported by random832.) 3150 3151 tzselect no longer mishandles Dominica, fixing a bug introduced 3152 in Release 2014f. (Problem reported by Owen Leibman.) 3153 3154 zic -l no longer fails when compiled with -DTZDEFAULT=\"/etc/localtime\". 3155 This fixes a bug introduced in Release 2014f. 3156 (Problem reported by Leonardo Chiquitto.) 3157 3158 3159 Release 2015d - 2015-04-24 08:09:46 -0700 3160 3161 Changes affecting future timestamps 3162 3163 Egypt will not observe DST in 2015 and will consider canceling it 3164 permanently. For now, assume no DST indefinitely. 3165 (Thanks to Ahmed Nazmy and Tim Parenti.) 3166 3167 Changes affecting past timestamps 3168 3169 America/Whitehorse switched from UT -09 to -08 on 1967-05-28, not 3170 1966-07-01. Also, Yukon's time zone history is documented better. 3171 (Thanks to Brian Inglis and Dennis Ferguson.) 3172 3173 Change affecting past and future time zone abbreviations 3174 3175 The abbreviations for Hawaii-Aleutian standard and daylight times 3176 have been changed from HAST/HADT to HST/HDT, as per US Government 3177 Printing Office style. This affects only America/Adak since 1983, 3178 as America/Honolulu was already using the new style. 3179 3180 Changes affecting code 3181 3182 zic has some minor performance improvements. 3183 3184 3185 Release 2015c - 2015-04-11 08:55:55 -0700 3186 3187 Changes affecting future timestamps 3188 3189 Egypt's spring-forward transition is at 24:00 on April's last Thursday, 3190 not 00:00 on April's last Friday. 2015's transition will therefore be on 3191 Thursday, April 30 at 24:00, not Friday, April 24 at 00:00. Similar fixes 3192 apply to 2026, 2037, 2043, etc. (Thanks to Steffen Thorsen.) 3193 3194 Changes affecting past timestamps 3195 3196 The following changes affect some pre-1991 Chile-related timestamps 3197 in America/Santiago, Antarctica/Palmer, and Pacific/Easter. 3198 3199 The 1910 transition was January 10, not January 1. 3200 3201 The 1918 transition was September 10, not September 1. 3202 3203 The UT -04 time observed from 1932 to 1942 is now considered to 3204 be standard time, not year-round DST. 3205 3206 Santiago observed DST (UT -03) from 1946-07-15 through 3207 1946-08-31, then reverted to standard time, then switched to -05 3208 on 1947-04-01. 3209 3210 Assume transitions before 1968 were at 00:00, since we have no data 3211 saying otherwise. 3212 3213 The spring 1988 transition was 1988-10-09, not 1988-10-02. 3214 The fall 1990 transition was 1990-03-11, not 1990-03-18. 3215 3216 Assume no UT offset change for Pacific/Easter on 1890-01-01, 3217 and omit all transitions on Pacific/Easter from 1942 through 1946 3218 since we have no data suggesting that they existed. 3219 3220 One more zone has been turned into a link, as it differed 3221 from an existing zone only for older timestamps. As usual, 3222 this change affects UT offsets in pre-1970 timestamps only. 3223 The zone's old contents have been moved to the 'backzone' file. 3224 The affected zone is America/Montreal. 3225 3226 Changes affecting commentary 3227 3228 Mention the TZUpdater tool. 3229 3230 Mention "The Time Now". (Thanks to Brandon Ramsey.) 3231 3232 3233 Release 2015b - 2015-03-19 23:28:11 -0700 3234 3235 Changes affecting future timestamps 3236 3237 Mongolia will start observing DST again this year, from the last 3238 Saturday in March at 02:00 to the last Saturday in September at 00:00. 3239 (Thanks to Ganbold Tsagaankhuu.) 3240 3241 Palestine will start DST on March 28, not March 27. Also, 3242 correct the fall 2014 transition from September 26 to October 24. 3243 Adjust future predictions accordingly. (Thanks to Steffen Thorsen.) 3244 3245 Changes affecting past timestamps 3246 3247 The 1982 zone shift in Pacific/Easter has been corrected, fixing a 2015a 3248 regression. (Thanks to Stuart Bishop for reporting the problem.) 3249 3250 Some more zones have been turned into links, when they differed 3251 from existing zones only for older timestamps. As usual, 3252 these changes affect UT offsets in pre-1970 timestamps only. 3253 Their old contents have been moved to the 'backzone' file. 3254 The affected zones are: America/Antigua, America/Cayman, 3255 Pacific/Midway, and Pacific/Saipan. 3256 3257 Changes affecting time zone abbreviations 3258 3259 Correct the 1992-2010 DST abbreviation in Volgograd from "MSK" to "MSD". 3260 (Thanks to Hank W.) 3261 3262 Changes affecting code 3263 3264 Fix integer overflow bug in reference 'mktime' implementation. 3265 (Problem reported by Jrg Richter.) 3266 3267 Allow -Dtime_tz=time_t compilations, and allow -Dtime_tz=... libraries 3268 to be used in the same executable as standard-library time_t functions. 3269 (Problems reported by Bradley White.) 3270 3271 Changes affecting commentary 3272 3273 Cite the recent Mexican decree changing Quintana Roo's time zone. 3274 (Thanks to Carlos Ral Perasso.) 3275 3276 Likewise for the recent Chilean decree. (Thanks to Eduardo Romero Urra.) 3277 3278 Update info about Mars time. 3279 3280 3281 Release 2015a - 2015-01-29 22:35:20 -0800 3282 3283 Changes affecting future timestamps 3284 3285 The Mexican state of Quintana Roo, represented by America/Cancun, 3286 will shift from Central Time with DST to Eastern Time without DST 3287 on 2015-02-01 at 02:00. (Thanks to Steffen Thorsen and Gwillim Law.) 3288 3289 Chile will not change clocks in April or thereafter; its new standard time 3290 will be its old daylight saving time. This affects America/Santiago, 3291 Pacific/Easter, and Antarctica/Palmer. (Thanks to Juan Correa.) 3292 3293 New leap second 2015-06-30 23:59:60 UTC as per IERS Bulletin C 49. 3294 (Thanks to Tim Parenti.) 3295 3296 Changes affecting past timestamps 3297 3298 Iceland observed DST in 1919 and 1921, and its 1939 fallback 3299 transition was Oct. 29, not Nov. 29. Remove incorrect data from 3300 Shanks about time in Iceland between 1837 and 1908. 3301 3302 Some more zones have been turned into links, when they differed 3303 from existing zones only for older timestamps. As usual, 3304 these changes affect UT offsets in pre-1970 timestamps only. 3305 Their old contents have been moved to the 'backzone' file. 3306 The affected zones are: Asia/Aden, Asia/Bahrain, Asia/Kuwait, 3307 and Asia/Muscat. 3308 3309 Changes affecting code 3310 3311 tzalloc now scrubs time zone abbreviations compatibly with the way 3312 that tzset always has, by replacing invalid bytes with '_' and by 3313 shortening too-long abbreviations. 3314 3315 tzselect ports to POSIX awk implementations, no longer mishandles 3316 POSIX TZ settings when GNU awk is used, and reports POSIX TZ 3317 settings to the user. (Thanks to Stefan Kuhn.) 3318 3319 Changes affecting build procedure 3320 3321 'make check' now checks for links to links in the data. 3322 One such link (for Africa/Asmera) has been fixed. 3323 (Thanks to Stephen Colebourne for pointing out the problem.) 3324 3325 Changes affecting commentary 3326 3327 The leapseconds file commentary now mentions the expiration date. 3328 (Problem reported by Martin Burnicki.) 3329 3330 Update Mexican Library of Congress URL. 3331 3332 3333 Release 2014j - 2014-11-10 17:37:11 -0800 3334 3335 Changes affecting current and future timestamps 3336 3337 Turks & Caicos' switch from US eastern time to UT -04 year-round 3338 did not occur on 2014-11-02 at 02:00. It's currently scheduled 3339 for 2015-11-01 at 02:00. (Thanks to Chris Walton.) 3340 3341 Changes affecting past timestamps 3342 3343 Many pre-1989 timestamps have been corrected for Asia/Seoul and 3344 Asia/Pyongyang, based on sources for the Korean-language Wikipedia 3345 entry for time in Korea. (Thanks to Sanghyuk Jung.) Also, no 3346 longer guess that Pyongyang mimicked Seoul time after World War II, 3347 as this is politically implausible. 3348 3349 Some more zones have been turned into links, when they differed 3350 from existing zones only for older timestamps. As usual, 3351 these changes affect UT offsets in pre-1970 timestamps only. 3352 Their old contents have been moved to the 'backzone' file. 3353 The affected zones are: Africa/Addis_Ababa, Africa/Asmara, 3354 Africa/Dar_es_Salaam, Africa/Djibouti, Africa/Kampala, 3355 Africa/Mogadishu, Indian/Antananarivo, Indian/Comoro, and 3356 Indian/Mayotte. 3357 3358 Changes affecting commentary 3359 3360 The commentary is less enthusiastic about Shanks as a source, 3361 and is more careful to distinguish UT from UTC. 3362 3363 3364 Release 2014i - 2014-10-21 22:04:57 -0700 3365 3366 Changes affecting future timestamps 3367 3368 Pacific/Fiji will observe DST from 2014-11-02 02:00 to 2015-01-18 03:00. 3369 (Thanks to Ken Rylander for the heads-up.) Guess that future 3370 years will use a similar pattern. 3371 3372 A new Zone Pacific/Bougainville, for the part of Papua New Guinea 3373 that plans to switch from UT +10 to +11 on 2014-12-28 at 02:00. 3374 (Thanks to Kiley Walbom for the heads-up.) 3375 3376 Changes affecting time zone abbreviations 3377 3378 Since Belarus is not changing its clocks even though Moscow is, 3379 the time zone abbreviation in Europe/Minsk is changing from FET 3380 to its more traditional value MSK on 2014-10-26 at 01:00. 3381 (Thanks to Alexander Bokovoy for the heads-up about Belarus.) 3382 3383 The new abbreviation IDT stands for the pre-1976 use of UT +08 in 3384 Indochina, to distinguish it better from ICT (+07). 3385 3386 Changes affecting past timestamps 3387 3388 Many timestamps have been corrected for Asia/Ho_Chi_Minh before 1976 3389 (thanks to Trn Ngc Qun for an indirect pointer to Trn Tin Bnh's 3390 authoritative book). Asia/Ho_Chi_Minh has been added to 3391 zone1970.tab, to give tzselect users in Vietnam two choices, 3392 since north and south Vietnam disagreed after our 1970 cutoff. 3393 3394 Asia/Phnom_Penh and Asia/Vientiane have been turned into links, as 3395 they differed from existing zones only for older timestamps. As 3396 usual, these changes affect pre-1970 timestamps only. Their old 3397 contents have been moved to the 'backzone' file. 3398 3399 Changes affecting code 3400 3401 The time-related library functions now set errno on failure, and 3402 some crashes in the new tzalloc-related library functions have 3403 been fixed. (Thanks to Christos Zoulas for reporting most of 3404 these problems and for suggesting fixes.) 3405 3406 If USG_COMPAT is defined and the requested timestamp is standard time, 3407 the tz library's localtime and mktime functions now set the extern 3408 variable timezone to a value appropriate for that timestamp; and 3409 similarly for ALTZONE, daylight saving time, and the altzone variable. 3410 This change is a companion to the tzname change in 2014h, and is 3411 designed to make timezone and altzone more compatible with tzname. 3412 3413 The tz library's functions now set errno to EOVERFLOW if they fail 3414 because the result cannot be represented. ctime and ctime_r now 3415 return NULL and set errno when a timestamp is out of range, rather 3416 than having undefined behavior. 3417 3418 Some bugs associated with the new 2014g functions have been fixed. 3419 This includes a bug that largely incapacitated the new functions 3420 time2posix_z and posix2time_z. (Thanks to Christos Zoulas.) 3421 It also includes some uses of uninitialized variables after tzalloc. 3422 The new code uses the standard type 'ssize_t', which the Makefile 3423 now gives porting advice about. 3424 3425 Changes affecting commentary 3426 3427 Updated URLs for NRC Canada (thanks to Matt Johnson and Brian Inglis). 3428 3429 3430 Release 2014h - 2014-09-25 18:59:03 -0700 3431 3432 Changes affecting past timestamps 3433 3434 America/Jamaica's 1974 spring-forward transition was Jan. 6, not Apr. 28. 3435 3436 Shanks says Asia/Novokuznetsk switched from LMT (not "NMT") on 1924-05-01, 3437 not 1920-01-06. The old entry was based on a misinterpretation of Shanks. 3438 3439 Some more zones have been turned into links, when they differed 3440 from existing zones only for older timestamps. As usual, 3441 these changes affect UT offsets in pre-1970 timestamps only. 3442 Their old contents have been moved to the 'backzone' file. 3443 The affected zones are: Africa/Blantyre, Africa/Bujumbura, 3444 Africa/Gaborone, Africa/Harare, Africa/Kigali, Africa/Lubumbashi, 3445 Africa/Lusaka, Africa/Maseru, and Africa/Mbabane. 3446 3447 Changes affecting code 3448 3449 zdump -V and -v now output gmtoff= values on all platforms, 3450 not merely on platforms defining TM_GMTOFF. 3451 3452 The tz library's localtime and mktime functions now set tzname to a value 3453 appropriate for the requested timestamp, and zdump now uses this 3454 on platforms not defining TM_ZONE, fixing a 2014g regression. 3455 (Thanks to Tim Parenti for reporting the problem.) 3456 3457 The tz library no longer sets tzname if localtime or mktime fails. 3458 3459 zdump -c no longer mishandles transitions near year boundaries. 3460 (Thanks to Tim Parenti for reporting the problem.) 3461 3462 An access to uninitialized data has been fixed. 3463 (Thanks to Jrg Richter for reporting the problem.) 3464 3465 When THREAD_SAFE is defined, the code ports to the C11 memory model. 3466 A memory leak has been fixed if ALL_STATE and THREAD_SAFE are defined 3467 and two threads race to initialize data used by gmtime-like functions. 3468 (Thanks to Andy Heninger for reporting the problems.) 3469 3470 Changes affecting build procedure 3471 3472 'make check' now checks better for properly sorted data. 3473 3474 Changes affecting documentation and commentary 3475 3476 zdump's gmtoff=N output is now documented, and its isdst=D output 3477 is now documented to possibly output D values other than 0 or 1. 3478 3479 zdump -c's treatment of years is now documented to use the 3480 Gregorian calendar and Universal Time without leap seconds, 3481 and its behavior at cutoff boundaries is now documented better. 3482 (Thanks to Arthur David Olson and Tim Parenti for reporting the problems.) 3483 3484 Programs are now documented to use the proleptic Gregorian calendar. 3485 (Thanks to Alan Barrett for the suggestion.) 3486 3487 Fractional-second GMT offsets have been documented for civil time 3488 in 19th-century Chennai, Jakarta, and New York. 3489 3490 3491 Release 2014g - 2014-08-28 12:31:23 -0700 3492 3493 Changes affecting future timestamps 3494 3495 Turks & Caicos is switching from US eastern time to UT -04 3496 year-round, modeled as a switch on 2014-11-02 at 02:00. 3497 [As noted in 2014j, this switch was later delayed.] 3498 3499 Changes affecting past timestamps 3500 3501 Time in Russia or the USSR before 1926 or so has been corrected by 3502 a few seconds in the following zones: Asia/Irkutsk, 3503 Asia/Krasnoyarsk, Asia/Omsk, Asia/Samarkand, Asia/Tbilisi, 3504 Asia/Vladivostok, Asia/Yakutsk, Europe/Riga, Europe/Samara. For 3505 Asia/Yekaterinburg the correction is a few minutes. (Thanks to 3506 Vladimir Karpinsky.) 3507 3508 The Portuguese decree of 1911-05-26 took effect on 1912-01-01. 3509 This affects 1911 timestamps in Africa/Bissau, Africa/Luanda, 3510 Atlantic/Azores, and Atlantic/Madeira. Also, Lisbon's pre-1912 3511 GMT offset was -0:36:45 (rounded from -0:36:44.68), not -0:36:32. 3512 (Thanks to Stephen Colebourne for pointing to the decree.) 3513 3514 Asia/Dhaka ended DST on 2009-12-31 at 24:00, not 23:59. 3515 3516 A new file 'backzone' contains data which may appeal to 3517 connoisseurs of old timestamps, although it is out of scope for 3518 the tz database, is often poorly sourced, and contains some data 3519 that is known to be incorrect. The new file is not recommended 3520 for ordinary use and its entries are not installed by default. 3521 (Thanks to Lester Caine for the high-quality Jersey, Guernsey, and 3522 Isle of Man entries.) 3523 3524 Some more zones have been turned into links, when they differed 3525 from existing zones only for older timestamps. As usual, 3526 these changes affect UT offsets in pre-1970 timestamps only. 3527 Their old contents have been moved to the 'backzone' file. 3528 The affected zones are: Africa/Bangui, Africa/Brazzaville, 3529 Africa/Douala, Africa/Kinshasa, Africa/Libreville, Africa/Luanda, 3530 Africa/Malabo, Africa/Niamey, and Africa/Porto-Novo. 3531 3532 Changes affecting code 3533 3534 Unless NETBSD_INSPIRED is defined to 0, the tz library now 3535 supplies functions for creating and using objects that represent 3536 timezones. The new functions are tzalloc, tzfree, localtime_rz, 3537 mktime_z, and (if STD_INSPIRED is also defined) posix2time_z and 3538 time2posix_z. They are intended for performance: for example, 3539 localtime_rz (unlike localtime_r) is trivially thread-safe without 3540 locking. (Thanks to Christos Zoulas for proposing NetBSD-inspired 3541 functions, and to Alan Barrett and Jonathan Lennox for helping to 3542 debug the change.) 3543 3544 zdump now builds with the tz library unless USE_LTZ is defined to 0, 3545 This lets zdump use tz features even if the system library lacks them. 3546 To build zdump with the system library, use 'make CFLAGS=-DUSE_LTZ=0 3547 TZDOBJS=zdump.o CHECK_TIME_T_ALTERNATIVES='. 3548 3549 zdump now uses localtime_rz if available, as it's significantly faster, 3550 and it can help zdump better diagnose invalid timezone names. 3551 Define HAVE_LOCALTIME_RZ to 0 to suppress this. HAVE_LOCALTIME_RZ 3552 defaults to 1 if NETBSD_INSPIRED && USE_LTZ. When localtime_rz is 3553 not available, zdump now uses localtime_r and tzset if available, 3554 as this is a bit cleaner and faster than plain localtime. Compile 3555 with -DHAVE_LOCALTIME_R=0 and/or -DHAVE_TZSET=0 if your system 3556 lacks these two functions. 3557 3558 If THREAD_SAFE is defined to 1, the tz library is now thread-safe. 3559 Although not needed for tz's own applications, which are single-threaded, 3560 this supports POSIX better if the tz library is used in multithreaded apps. 3561 3562 Some crashes have been fixed when zdump or the tz library is given 3563 invalid or outlandish input. 3564 3565 The tz library no longer mishandles leap seconds on platforms with 3566 unsigned time_t in timezones that lack ordinary transitions after 1970. 3567 3568 The tz code now attempts to infer TM_GMTOFF and TM_ZONE if not 3569 already defined, to make it easier to configure on common platforms. 3570 Define NO_TM_GMTOFF and NO_TM_ZONE to suppress this. 3571 3572 Unless the new macro UNINIT_TRAP is defined to 1, the tz code now 3573 assumes that reading uninitialized memory yields garbage values 3574 but does not cause other problems such as traps. 3575 3576 If TM_GMTOFF is defined and UNINIT_TRAP is 0, mktime is now 3577 more likely to guess right for ambiguous timestamps near 3578 transitions where tm_isdst does not change. 3579 3580 If HAVE_STRFTIME_L is defined to 1, the tz library now defines 3581 strftime_l for compatibility with recent versions of POSIX. 3582 Only the C locale is supported, though. HAVE_STRFTIME_L defaults 3583 to 1 on recent POSIX versions, and to 0 otherwise. 3584 3585 tzselect -c now uses a hybrid distance measure that works better 3586 in Africa. (Thanks to Alan Barrett for noting the problem.) 3587 3588 The C source code now ports to NetBSD when GCC_DEBUG_FLAGS is used, 3589 or when time_tz is defined. 3590 3591 When HAVE_UTMPX_H is set the 'date' command now builds on systems 3592 whose <utmpx.h> file does not define WTMPX_FILE, and when setting 3593 the date it updates the wtmpx file if _PATH_WTMPX is defined. 3594 This affects GNU/Linux and similar systems. 3595 3596 For easier maintenance later, some C code has been simplified, 3597 some lint has been removed, and the code has been tweaked so that 3598 plain 'make' is more likely to work. 3599 3600 The C type 'bool' is now used for boolean values, instead of 'int'. 3601 3602 The long-obsolete LOCALE_HOME code has been removed. 3603 3604 The long-obsolete 'gtime' function has been removed. 3605 3606 Changes affecting build procedure 3607 3608 'zdump' no longer links in ialloc.o, as it's not needed. 3609 3610 'make check_time_t_alternatives' no longer assumes GNU diff. 3611 3612 Changes affecting distribution tarballs 3613 3614 The files checktab.awk and zoneinfo2tdf.pl are now distributed in 3615 the tzdata tarball instead of the tzcode tarball, since they help 3616 maintain the data. The NEWS and Theory files are now also 3617 distributed in the tzdata tarball, as they're relevant for data. 3618 (Thanks to Alan Barrett for pointing this out.) Also, the 3619 leapseconds.awk file is no longer distributed in the tzcode 3620 tarball, since it belongs in the tzdata tarball (where 2014f 3621 inadvertently also distributed it). 3622 3623 Changes affecting documentation and commentary 3624 3625 A new file CONTRIBUTING is distributed. (Thanks to Tim Parenti for 3626 suggesting a CONTRIBUTING file, and to Tony Finch and Walter Harms 3627 for debugging it.) 3628 3629 The man pages have been updated to use function prototypes, 3630 to document thread-safe variants like localtime_r, and to document 3631 the NetBSD-inspired functions tzalloc, tzfree, localtime_rz, and 3632 mktime_z. 3633 3634 The fields in Link lines have been renamed to be more descriptive 3635 and more like the parameters of 'ln'. LINK-FROM has become TARGET, 3636 and LINK-TO has become LINK-NAME. 3637 3638 tz-link.htm mentions the IETF's tzdist working group; Windows 3639 Runtime etc. (thanks to Matt Johnson); and HP-UX's tztab. 3640 3641 Some broken URLs have been fixed in the commentary. (Thanks to 3642 Lester Caine.) 3643 3644 Commentary about Philippines DST has been updated, and commentary 3645 on pre-1970 time in India has been added. 3646 3647 3648 Release 2014f - 2014-08-05 17:42:36 -0700 3649 3650 Changes affecting future timestamps 3651 3652 Russia will subtract an hour from most of its time zones on 2014-10-26 3653 at 02:00 local time. (Thanks to Alexander Krivenyshev.) 3654 There are a few exceptions: Magadan Oblast (Asia/Magadan) and Zabaykalsky 3655 Krai are subtracting two hours; conversely, Chukotka Autonomous Okrug 3656 (Asia/Anadyr), Kamchatka Krai (Asia/Kamchatka), Kemerovo Oblast 3657 (Asia/Novokuznetsk), and the Samara Oblast and the Udmurt Republic 3658 (Europe/Samara) are not changing their clocks. The changed zones are 3659 Europe/Kaliningrad, Europe/Moscow, Europe/Simferopol, Europe/Volgograd, 3660 Asia/Yekaterinburg, Asia/Omsk, Asia/Novosibirsk, Asia/Krasnoyarsk, 3661 Asia/Irkutsk, Asia/Yakutsk, Asia/Vladivostok, Asia/Khandyga, 3662 Asia/Sakhalin, and Asia/Ust-Nera; Asia/Magadan will have two hours 3663 subtracted; and Asia/Novokuznetsk's time zone abbreviation is affected, 3664 but not its UTC offset. Two zones are added: Asia/Chita (split 3665 from Asia/Yakutsk, and also with two hours subtracted) and 3666 Asia/Srednekolymsk (split from Asia/Magadan, but with only one hour 3667 subtracted). (Thanks to Tim Parenti for much of the above.) 3668 3669 Changes affecting time zone abbreviations 3670 3671 Australian eastern time zone abbreviations are now AEST/AEDT not EST, 3672 and similarly for the other Australian zones. That is, for eastern 3673 standard and daylight saving time the abbreviations are AEST and AEDT 3674 instead of the former EST for both; similarly, ACST/ACDT, ACWST/ACWDT, 3675 and AWST/AWDT are now used instead of the former CST, CWST, and WST. 3676 This change does not affect UT offsets, only time zone abbreviations. 3677 (Thanks to Rich Tibbett and many others.) 3678 3679 Asia/Novokuznetsk shifts from NOVT to KRAT (remaining on UT +07) 3680 effective 2014-10-26 at 02:00 local time. 3681 3682 The time zone abbreviation for Xinjiang Time (observed in rmqi) 3683 has been changed from URUT to XJT. (Thanks to Luther Ma.) 3684 3685 Prefer MSK/MSD for Moscow time in Russia, even in other cities. 3686 Similarly, prefer EET/EEST for eastern European time in Russia. 3687 3688 Change time zone abbreviations in (western) Samoa to use "ST" and 3689 "DT" suffixes, as this is more likely to match common practice. 3690 Prefix "W" to (western) Samoa time when its standard-time offset 3691 disagrees with that of American Samoa. 3692 3693 America/Metlakatla now uses PST, not MeST, to abbreviate its time zone. 3694 3695 Time zone abbreviations have been updated for Japan's two time 3696 zones used 1896-1937. JWST now stands for Western Standard 3697 Time, and JCST for Central Standard Time (formerly this was CJT). 3698 These abbreviations are now used for time in Korea, Taiwan, 3699 and Sakhalin while controlled by Japan. 3700 3701 Changes affecting past timestamps 3702 3703 China's five zones have been simplified to two, since the post-1970 3704 differences in the other three seem to have been imaginary. The 3705 zones Asia/Harbin, Asia/Chongqing, and Asia/Kashgar have been 3706 removed; backwards-compatibility links still work, albeit with 3707 different behaviors for timestamps before May 1980. Asia/Urumqi's 3708 1980 transition to UT +08 has been removed, so that it is now at 3709 +06 and not +08. (Thanks to Luther Ma and to Alois Treindl; 3710 Treindl sent helpful translations of two papers by Guo Qingsheng.) 3711 3712 Some zones have been turned into links, when they differed from existing 3713 zones only for older UT offsets where data entries were likely invented. 3714 These changes affect UT offsets in pre-1970 timestamps only. This is 3715 similar to the change in release 2013e, except this time for western 3716 Africa. The affected zones are: Africa/Bamako, Africa/Banjul, 3717 Africa/Conakry, Africa/Dakar, Africa/Freetown, Africa/Lome, 3718 Africa/Nouakchott, Africa/Ouagadougou, Africa/Sao_Tome, and 3719 Atlantic/St_Helena. This also affects the backwards-compatibility 3720 link Africa/Timbuktu. (Thanks to Alan Barrett, Stephen Colebourne, 3721 Tim Parenti, and David Patte for reporting problems in earlier 3722 versions of this change.) 3723 3724 Asia/Shanghai's pre-standard-time UT offset has been changed from 3725 8:05:57 to 8:05:43, the location of Xujiahui Observatory. Its 3726 transition to standard time has been changed from 1928 to 1901. 3727 3728 Asia/Taipei switched to JWST on 1896-01-01, then to JST on 1937-10-01, 3729 then to CST on 1945-09-21 at 01:00, and did not observe DST in 1945. 3730 In 1946 it observed DST from 05-15 through 09-30; in 1947 3731 from 04-15 through 10-31; and in 1979 from 07-01 through 09-30. 3732 (Thanks to Yu-Cheng Chuang.) 3733 3734 Asia/Riyadh's transition to standard time is now 1947-03-14, not 1950. 3735 3736 Europe/Helsinki's 1942 fall-back transition was 10-04 at 01:00, not 3737 10-03 at 00:00. (Thanks to Konstantin Hyppnen.) 3738 3739 Pacific/Pago_Pago has been changed from UT -11:30 to -11 for the 3740 period from 1911 to 1950. 3741 3742 Pacific/Chatham has been changed to New Zealand standard time plus 3743 45 minutes for the period before 1957, reflecting a 1956 remark in 3744 the New Zealand parliament. 3745 3746 Europe/Budapest has several pre-1946 corrections: in 1918 the transition 3747 out of DST was on 09-16, not 09-29; in 1919 it was on 11-24, not 09-15; in 3748 1945 it was on 11-01, not 11-03; in 1941 the transition to DST was 04-08 3749 not 04-06 at 02:00; and there was no DST in 1920. 3750 3751 Africa/Accra is now assumed to have observed DST from 1920 through 1935. 3752 3753 Time in Russia before 1927 or so has been corrected by a few seconds in 3754 the following zones: Europe/Moscow, Asia/Irkutsk, Asia/Tbilisi, 3755 Asia/Tashkent, Asia/Vladivostok, Asia/Yekaterinburg, Europe/Helsinki, and 3756 Europe/Riga. Also, Moscow's location has been changed to its Kilometer 0 3757 point. (Thanks to Vladimir Karpinsky for the Moscow changes.) 3758 3759 Changes affecting data format 3760 3761 A new file 'zone1970.tab' supersedes 'zone.tab' in the installed data. 3762 The new file's extended format allows multiple country codes per zone. 3763 The older file is still installed but is deprecated; its format is 3764 not changing and it will still be distributed for a while, but new 3765 applications should use the new file. 3766 3767 The new file format simplifies maintenance of obscure locations. 3768 To test this, it adds coverage for the Crozet Islands and the 3769 Scattered Islands. (Thanks to Tobias Conradi and Antoine Leca.) 3770 3771 The file 'iso3166.tab' is planned to switch from ASCII to UTF-8. 3772 It is still ASCII now, but commentary about the switch has been added. 3773 The new file 'zone1970.tab' already uses UTF-8. 3774 3775 Changes affecting code 3776 3777 'localtime', 'mktime', etc. now use much less stack space if ALL_STATE 3778 is defined. (Thanks to Elliott Hughes for reporting the problem.) 3779 3780 'zic' no longer mishandles input when ignoring case in locales that 3781 are not compatible with English, e.g., unibyte Turkish locales when 3782 compiled with HAVE_GETTEXT. 3783 3784 Error diagnostics of 'zic' and 'yearistype' have been reworded so that 3785 they no longer use ASCII '-' as if it were a dash. 3786 3787 'zic' now rejects output file names that contain '.' or '..' components. 3788 (Thanks to Tim Parenti for reporting the problem.) 3789 3790 'zic -v' now warns about output file names that do not follow 3791 POSIX rules, or that contain a digit or '.'. (Thanks to Arthur 3792 David Olson for starting the ball rolling on this.) 3793 3794 Some lint has been removed when using GCC_DEBUG_FLAGS with GCC 4.9.0. 3795 3796 Changes affecting build procedure 3797 3798 'zic' no longer links in localtime.o and asctime.o, as they're not needed. 3799 (Thanks to John Cochran.) 3800 3801 Changes affecting documentation and commentary 3802 3803 The 'Theory' file documents legacy names, the longstanding 3804 exceptions to the POSIX-inspired file name rules. 3805 3806 The 'zic' documentation clarifies the role of time types when 3807 interpreting dates. (Thanks to Arthur David Olson.) 3808 3809 Documentation and commentary now prefer UTF-8 to US-ASCII, 3810 allowing the use of proper accents in foreign words and names. 3811 Code and data have not changed because of this. (Thanks to 3812 Garrett Wollman, Ian Abbott, and Guy Harris for helping to debug 3813 this.) 3814 3815 Non-HTML documentation and commentary now use plain-text URLs instead of 3816 HTML insertions, and are more consistent about bracketing URLs when they 3817 are not already surrounded by white space. (Thanks to suggestions by 3818 Steffen Nurpmeso.) 3819 3820 There is new commentary about Xujiahui Observatory, the five time-zone 3821 project in China from 1918 to 1949, timekeeping in Japanese-occupied 3822 Shanghai, and Tibet Time in the 1950s. The sharp-eyed can spot the 3823 warlord Jin Shuren in the data. 3824 3825 Commentary about the coverage of each Russian zone has been standardized. 3826 (Thanks to Tim Parenti.) 3827 3828 There is new commentary about contemporary timekeeping in Ethiopia. 3829 3830 Obsolete comments about a 2007 proposal for DST in Kuwait has been removed. 3831 3832 There is new commentary about time in Poland in 1919. 3833 3834 Proper credit has been given to DST inventor George Vernon Hudson. 3835 3836 Commentary about time in Metlakatla, AK and Resolute, NU has been 3837 improved, with a new source for the former. 3838 3839 In zone.tab, Pacific/Easter no longer mentions Salas y Gmez, as it 3840 is uninhabited. 3841 3842 Commentary about permanent Antarctic bases has been updated. 3843 3844 Several typos have been corrected. (Thanks to Tim Parenti for 3845 contributing some of these fixes.) 3846 3847 tz-link.htm now mentions the JavaScript libraries Moment Timezone, 3848 TimezoneJS.Date, Walltime-js, and Timezone. (Thanks to a heads-up 3849 from Matt Johnson.) Also, it mentions the Go 'latlong' package. 3850 (Thanks to a heads-up from Dirkjan Ochtman.) 3851 3852 The files usno1988, usno1989, usno1989a, usno1995, usno1997, and usno1998 3853 have been removed. These obsolescent US Naval Observatory entries were no 3854 longer helpful for maintenance. (Thanks to Tim Parenti for the suggestion.) 3855 3856 3857 Release 2014e - 2014-06-12 21:53:52 -0700 3858 3859 Changes affecting near-future timestamps 3860 3861 Egypt's 2014 Ramadan-based transitions are June 26 and July 31 at 24:00. 3862 (Thanks to Imed Chihi.) Guess that from 2015 on Egypt will temporarily 3863 switch to standard time at 24:00 the last Thursday before Ramadan, and 3864 back to DST at 00:00 the first Friday after Ramadan. 3865 3866 Similarly, Morocco's are June 28 at 03:00 and August 2 at 02:00. (Thanks 3867 to Milamber Space Network.) Guess that from 2015 on Morocco will 3868 temporarily switch to standard time at 03:00 the last Saturday before 3869 Ramadan, and back to DST at 02:00 the first Saturday after Ramadan. 3870 3871 Changes affecting past timestamps 3872 3873 The abbreviation "MSM" (Moscow Midsummer Time) is now used instead of 3874 "MSD" for Moscow's double daylight time in summer 1921. Also, a typo 3875 "VLASST" has been repaired to be "VLAST" for Vladivostok summer time 3876 in 1991. (Thanks to Hank W. for reporting the problems.) 3877 3878 Changes affecting commentary 3879 3880 tz-link.htm now cites RFC 7265 for jCal, mentions PTP and the 3881 draft CalDAV extension, updates URLs for TSP, TZInfo, IATA, and 3882 removes stale pointers to World Time Explorer and WORLDTIME. 3883 3884 3885 Release 2014d - 2014-05-27 21:34:40 -0700 3886 3887 Changes affecting code 3888 3889 zic no longer generates files containing timestamps before the Big Bang. 3890 This works around GNOME glib bug 878 3891 <https://gitlab.gnome.org/GNOME/glib/issues/878> 3892 (Thanks to Leonardo Chiquitto for reporting the bug, and to 3893 Arthur David Olson and James Cloos for suggesting improvements to the fix.) 3894 3895 Changes affecting documentation 3896 3897 tz-link.htm now mentions GNOME. 3898 3899 3900 Release 2014c - 2014-05-13 07:44:13 -0700 3901 3902 Changes affecting near-future timestamps 3903 3904 Egypt observes DST starting 2014-05-15 at 24:00. 3905 (Thanks to Ahmad El-Dardiry and Gunther Vermier.) 3906 Details have not been announced, except that DST will not be observed 3907 during Ramadan. Guess that DST will stop during the same Ramadan dates as 3908 Morocco, and that Egypt's future spring and fall transitions will be the 3909 same as 2010 when it last observed DST, namely April's last Friday at 3910 00:00 to September's last Thursday at 23:00 standard time. Also, guess 3911 that Ramadan transitions will be at 00:00 standard time. 3912 3913 Changes affecting code 3914 3915 zic now generates transitions for minimum time values, eliminating guesswork 3916 when handling low-valued timestamps. (Thanks to Arthur David Olson.) 3917 3918 Port to Cygwin sans glibc. (Thanks to Arthur David Olson.) 3919 3920 Changes affecting commentary and documentation 3921 3922 Remove now-confusing comment about Jordan. (Thanks to Oleksii Nochovnyi.) 3923 3924 3925 Release 2014b - 2014-03-24 21:28:50 -0700 3926 3927 Changes affecting near-future timestamps 3928 3929 Crimea switches to Moscow time on 2014-03-30 at 02:00 local time. 3930 (Thanks to Alexander Krivenyshev.) Move its zone.tab entry from UA to RU. 3931 3932 New entry for Troll station, Antarctica. (Thanks to Paul-Inge Flakstad and 3933 Bengt-Inge Larsson.) This is currently an approximation; a better version 3934 will require the zic and localtime fixes mentioned below, and the plan is 3935 to wait for a while until at least the zic fixes propagate. 3936 3937 Changes affecting code 3938 3939 'zic' and 'localtime' no longer reject locations needing four transitions 3940 per year for the foreseeable future. (Thanks to Andrew Main (Zefram).) 3941 Also, 'zic' avoids some unlikely failures due to integer overflow. 3942 3943 Changes affecting build procedure 3944 3945 'make check' now detects Rule lines defined but never used. 3946 The NZAQ rules, an instance of this problem, have been removed. 3947 3948 Changes affecting commentary and documentation 3949 3950 Fix Tuesday/Thursday typo in description of time in Israel. 3951 (Thanks to Bert Katz via Pavel Kharitonov and Mike Frysinger.) 3952 3953 Microsoft Windows 8.1 doesn't support tz database names. (Thanks 3954 to Donald MacQueen.) Instead, the Microsoft Windows Store app 3955 library supports them. 3956 3957 Add comments about Johnston Island time in the 1960s. 3958 (Thanks to Lyle McElhaney.) 3959 3960 Morocco's 2014 DST start will be as predicted. 3961 (Thanks to Sebastien Willemijns.) 3962 3963 3964 Release 2014a - 2014-03-07 23:30:29 -0800 3965 3966 Changes affecting near-future timestamps 3967 3968 Turkey begins DST on 2014-03-31, not 03-30. (Thanks to Faruk Pasin for 3969 the heads-up, and to Tim Parenti for simplifying the update.) 3970 3971 Changes affecting past timestamps 3972 3973 Fiji ended DST on 2014-01-19 at 02:00, not the previously scheduled 03:00. 3974 (Thanks to Steffen Thorsen.) 3975 3976 Ukraine switched from Moscow to Eastern European time on 1990-07-01 3977 (not 1992-01-01), and observed DST during the entire next winter. 3978 (Thanks to Vladimir in Moscow via Alois Treindl.) 3979 3980 In 1988 Israel observed DST from 04-10 to 09-04, not 04-09 to 09-03. 3981 (Thanks to Avigdor Finkelstein.) 3982 3983 Changes affecting code 3984 3985 A uninitialized-storage bug in 'localtime' has been fixed. 3986 (Thanks to Logan Chien.) 3987 3988 Changes affecting the build procedure 3989 3990 The settings for 'make check_web' now default to Ubuntu 13.10. 3991 3992 Changes affecting commentary and documentation 3993 3994 The boundary of the US Pacific time zone is given more accurately. 3995 (Thanks to Alan Mintz.) 3996 3997 Chile's 2014 DST will be as predicted. (Thanks to Jos Miguel Garrido.) 3998 3999 Paraguay's 2014 DST will be as predicted. (Thanks to Carlos Ral Perasso.) 4000 4001 Better descriptions of countries with same time zone history as 4002 Trinidad and Tobago since 1970. (Thanks to Alan Barrett for suggestion.) 4003 4004 Several changes affect tz-link.htm, the main web page. 4005 4006 Mention Time.is (thanks to Even Scharning) and WX-now (thanks to 4007 David Braverman). 4008 4009 Mention xCal (Internet RFC 6321) and jCal. 4010 4011 Microsoft has some support for tz database names. 4012 4013 CLDR data formats include both XML and JSON. 4014 4015 Mention Maggiolo's map of solar vs standard time. 4016 (Thanks to Arthur David Olson.) 4017 4018 Mention TZ4Net. (Thanks to Matt Johnson.) 4019 4020 Mention the timezone-olson Haskell package. 4021 4022 Mention zeitverschiebung.net. (Thanks to Martin Jger.) 4023 4024 Remove moribund links to daylight-savings-time.info and to 4025 Simple Timer + Clocks. 4026 4027 Update two links. (Thanks to Oscar van Vlijmen.) 4028 4029 Fix some formatting glitches, e.g., remove random newlines from 4030 abbr elements' title attributes. 4031 4032 4033 Release 2013i - 2013-12-17 07:25:23 -0800 4034 4035 Changes affecting near-future timestamps: 4036 4037 Jordan switches back to standard time at 00:00 on December 20, 2013. 4038 The 2006-2011 transition schedule is planned to resume in 2014. 4039 (Thanks to Steffen Thorsen.) 4040 4041 Changes affecting past timestamps: 4042 4043 In 2004, Cuba began DST on March 28, not April 4. 4044 (Thanks to Steffen Thorsen.) 4045 4046 Changes affecting code 4047 4048 The compile-time flag NOSOLAR has been removed, as nowadays the 4049 benefit of slightly shrinking runtime table size is outweighed by the 4050 cost of disallowing potential future updates that exceed old limits. 4051 4052 Changes affecting documentation and commentary 4053 4054 The files solar87, solar88, and solar89 are no longer distributed. 4055 They were a negative experiment - that is, a demonstration that 4056 tz data can represent solar time only with some difficulty and error. 4057 Their presence in the distribution caused confusion, as Riyadh 4058 civil time was generally not solar time in those years. 4059 4060 tz-link.htm now mentions Noda Time. (Thanks to Matt Johnson.) 4061 4062 4063 Release 2013h - 2013-10-25 15:32:32 -0700 4064 4065 Changes affecting current and future timestamps: 4066 4067 Libya has switched its UT offset back to +02 without DST, instead 4068 of +01 with DST. (Thanks to Even Scharning.) 4069 4070 Western Sahara (Africa/El_Aaiun) uses Morocco's DST rules. 4071 (Thanks to Gwillim Law.) 4072 4073 Changes affecting future timestamps: 4074 4075 Acre and (we guess) western Amazonas will switch from UT -04 to -05 4076 on 2013-11-10. This affects America/Rio_Branco and America/Eirunepe. 4077 (Thanks to Steffen Thorsen.) 4078 4079 Add entries for DST transitions in Morocco in the year 2038. 4080 This avoids some year-2038 glitches introduced in 2013g. 4081 (Thanks to Yoshito Umaoka for reporting the problem.) 4082 4083 Changes affecting API 4084 4085 The 'tzselect' command no longer requires the 'select' command, 4086 and should now work with /bin/sh on more platforms. It also works 4087 around a bug in BusyBox awk before version 1.21.0. (Thanks to 4088 Patrick 'P. J.' McDermott and Alan Barrett.) 4089 4090 Changes affecting code 4091 4092 Fix localtime overflow bugs with 32-bit unsigned time_t. 4093 4094 zdump no longer assumes sscanf returns maximal values on overflow. 4095 4096 Changes affecting the build procedure 4097 4098 The builder can specify which programs to use, if any, instead of 4099 'ar' and 'ranlib', and libtz.a is now built locally before being 4100 installed. (Thanks to Michael Forney.) 4101 4102 A dependency typo in the 'zdump' rule has been fixed. 4103 (Thanks to Andrew Paprocki.) 4104 4105 The Makefile has been simplified by assuming that 'mkdir -p' and 'cp -f' 4106 work as specified by POSIX.2-1992 or later; this is portable nowadays. 4107 4108 'make clean' no longer removes 'leapseconds', since it's 4109 host-independent and is part of the distribution. 4110 4111 The unused makefile macros TZCSRCS, TZDSRCS, DATESRCS have been removed. 4112 4113 Changes affecting documentation and commentary 4114 4115 tz-link.htm now mentions TC TIMEZONE's draft time zone service protocol 4116 (thanks to Mike Douglass) and TimezoneJS.Date (thanks to Jim Fehrle). 4117 4118 Update URLs in tz-link page. Add URLs for Microsoft Windows, since 4119 8.1 introduces tz support. Remove URLs for Tru64 and UnixWare (no 4120 longer maintained) and for old advisories. SOFA now does C. 4121 4122 Release 2013g - 2013-09-30 21:08:26 -0700 4123 4124 Changes affecting current and near-future timestamps 4125 4126 Morocco now observes DST from the last Sunday in March to the last 4127 Sunday in October, not April to September respectively. (Thanks 4128 to Steffen Thorsen.) 4129 4130 Changes affecting 'zic' 4131 4132 'zic' now runs on platforms that lack both hard links and symlinks. 4133 (Thanks to Theo Veenker for reporting the problem, for MinGW.) 4134 Also, fix some bugs on platforms that lack hard links but have symlinks. 4135 4136 'zic -v' again warns that Asia/Tehran has no POSIX environment variable 4137 to predict the far future, fixing a bug introduced in 2013e. 4138 4139 Changes affecting the build procedure 4140 4141 The 'leapseconds' file is again put into the tzdata tarball. 4142 Also, 'leapseconds.awk', so tzdata is self-contained. (Thanks to 4143 Matt Burgess and Ian Abbott.) The timestamps of these and other 4144 dependent files in tarballs are adjusted more consistently. 4145 4146 Changes affecting documentation and commentary 4147 4148 The README file is now part of the data tarball as well as the code. 4149 It now states that files are public domain unless otherwise specified. 4150 (Thanks to Andrew Main (Zefram) for asking for clarifications.) 4151 Its details about the 1989 release moved to a place of honor near 4152 the end of NEWS. 4153 4154 4155 Release 2013f - 2013-09-24 23:37:36 -0700 4156 4157 Changes affecting near-future timestamps 4158 4159 Tocantins will very likely not observe DST starting this spring. 4160 (Thanks to Steffen Thorsen.) 4161 4162 Jordan will likely stay at UT +03 indefinitely, and will not fall 4163 back this fall. 4164 4165 Palestine will fall back at 00:00, not 01:00. (Thanks to Steffen Thorsen.) 4166 4167 Changes affecting API 4168 4169 The types of the global variables 'timezone' and 'altzone' (if present) 4170 have been changed back to 'long'. This is required for 'timezone' 4171 by POSIX, and for 'altzone' by common practice, e.g., Solaris 11. 4172 These variables were originally 'long' in the tz code, but were 4173 mistakenly changed to 'time_t' in 1987; nobody reported the 4174 incompatibility until now. The difference matters on x32, where 4175 'long' is 32 bits and 'time_t' is 64. (Thanks to Elliott Hughes.) 4176 4177 Changes affecting the build procedure 4178 4179 Avoid long strings in leapseconds.awk to work around a mawk bug. 4180 (Thanks to Cyril Baurand.) 4181 4182 Changes affecting documentation and commentary 4183 4184 New file 'NEWS' that contains release notes like this one. 4185 4186 Paraguay's law does not specify DST transition time; 00:00 is customary. 4187 (Thanks to Waldemar Villamayor-Venialbo.) 4188 4189 Minor capitalization fixes. 4190 4191 Changes affecting version-control only 4192 4193 The experimental GitHub repository now contains annotated and 4194 signed tags for recent releases, e.g., '2013e' for Release 2013e. 4195 Releases are tagged starting with 2012e; earlier releases were 4196 done differently, and tags would either not have a simple name or 4197 not exactly match what was released. 4198 4199 'make set-timestamps' is now simpler and a bit more portable. 4200 4201 4202 Release 2013e - 2013-09-19 23:50:04 -0700 4203 4204 Changes affecting near-future timestamps 4205 4206 This year Fiji will start DST on October 27, not October 20. 4207 (Thanks to David Wheeler for the heads-up.) For now, guess that 4208 Fiji will continue to spring forward the Sunday before the fourth 4209 Monday in October. 4210 4211 Changes affecting current and future time zone abbreviations 4212 4213 Use WIB/WITA/WIT rather than WIT/CIT/EIT for alphabetic Indonesian 4214 time zone abbreviations since 1932. (Thanks to George Ziegler, 4215 Priyadi Iman Nurcahyo, Zakaria, Jason Grimes, Martin Pitt, and 4216 Benny Lin.) This affects Asia/Dili, Asia/Jakarta, Asia/Jayapura, 4217 Asia/Makassar, and Asia/Pontianak. 4218 4219 Use ART (UT -03, standard time), rather than WARST (also -03, but 4220 daylight saving time) for San Luis, Argentina since 2009. 4221 4222 Changes affecting Godthb timestamps after 2037 if version mismatch 4223 4224 Allow POSIX-like TZ strings where the transition time's hour can 4225 range from -167 through 167, instead of the POSIX-required 0 4226 through 24. E.g., TZ='FJT-12FJST,M10.3.1/146,M1.3.4/75' for the 4227 new Fiji rules. This is a more compact way to represent 4228 far-future timestamps for America/Godthab, America/Santiago, 4229 Antarctica/Palmer, Asia/Gaza, Asia/Hebron, Asia/Jerusalem, 4230 Pacific/Easter, and Pacific/Fiji. Other zones are unaffected by 4231 this change. (Derived from a suggestion by Arthur David Olson.) 4232 4233 Allow POSIX-like TZ strings where daylight saving time is in 4234 effect all year. E.g., TZ='WART4WARST,J1/0,J365/25' for Western 4235 Argentina Summer Time all year. This supports a more compact way 4236 to represent the 2013d data for America/Argentina/San_Luis. 4237 Because of the change for San Luis noted above this change does not 4238 affect the current data. (Thanks to Andrew Main (Zefram) for 4239 suggestions that improved this change.) 4240 4241 Where these two TZ changes take effect, there is a minor extension 4242 to the tz file format in that it allows new values for the 4243 embedded TZ-format string, and the tz file format version number 4244 has therefore been increased from 2 to 3 as a precaution. 4245 Version-2-based client code should continue to work as before for 4246 all timestamps before 2038. Existing version-2-based client code 4247 (tzcode, GNU/Linux, Solaris) has been tested on version-3-format 4248 files, and typically works in practice even for timestamps after 4249 2037; the only known exception is America/Godthab. 4250 4251 Changes affecting timestamps before 1970 4252 4253 Pacific/Johnston is now a link to Pacific/Honolulu. This corrects 4254 some errors before 1947. 4255 4256 Some zones have been turned into links, when they differ from existing 4257 zones only in older data entries that were likely invented or that 4258 differ only in LMT or transitions from LMT. These changes affect 4259 only timestamps before 1943. The affected zones are: 4260 Africa/Juba, America/Anguilla, America/Aruba, America/Dominica, 4261 America/Grenada, America/Guadeloupe, America/Marigot, 4262 America/Montserrat, America/St_Barthelemy, America/St_Kitts, 4263 America/St_Lucia, America/St_Thomas, America/St_Vincent, 4264 America/Tortola, and Europe/Vaduz. (Thanks to Alois Treindl for 4265 confirming that the old Europe/Vaduz zone was wrong and the new 4266 link is better for WWII-era times.) 4267 4268 Change Kingston Mean Time from -5:07:12 to -5:07:11. This affects 4269 America/Cayman, America/Jamaica and America/Grand_Turk timestamps 4270 from 1890 to 1912. 4271 4272 Change the UT offset of Bern Mean Time from 0:29:44 to 0:29:46. 4273 This affects Europe/Zurich timestamps from 1853 to 1894. (Thanks 4274 to Alois Treindl.) 4275 4276 Change the date of the circa-1850 Zurich transition from 1849-09-12 4277 to 1853-07-16, overriding Shanks with data from Messerli about 4278 postal and telegraph time in Switzerland. 4279 4280 Changes affecting time zone abbreviations before 1970 4281 4282 For Asia/Jakarta, use BMT (not JMT) for mean time from 1923 to 1932, 4283 as Jakarta was called Batavia back then. 4284 4285 Changes affecting API 4286 4287 The 'zic' command now outputs a dummy transition when far-future 4288 data can't be summarized using a TZ string, and uses a 402-year 4289 window rather than a 400-year window. For the current data, this 4290 affects only the Asia/Tehran file. It does not affect any of the 4291 timestamps that this file represents, so zdump outputs the same 4292 information as before. (Thanks to Andrew Main (Zefram).) 4293 4294 The 'date' command has a new '-r' option, which lets you specify 4295 the integer time to display, a la FreeBSD. 4296 4297 The 'tzselect' command has two new options '-c' and '-n', which lets you 4298 select a zone based on latitude and longitude. 4299 4300 The 'zic' command's '-v' option now warns about constructs that 4301 require the new version-3 binary file format. (Thanks to Arthur 4302 David Olson for the suggestion.) 4303 4304 Support for floating-point time_t has been removed. 4305 It was always dicey, and POSIX no longer requires it. 4306 (Thanks to Eric Blake for suggesting to the POSIX committee to 4307 remove it, and thanks to Alan Barrett, Clive D.W. Feather, Andy 4308 Heninger, Arthur David Olson, and Alois Treindl, for reporting 4309 bugs and elucidating some of the corners of the old floating-point 4310 implementation.) 4311 4312 The signatures of 'offtime', 'timeoff', and 'gtime' have been 4313 changed back to the old practice of using 'long' to represent UT 4314 offsets. This had been inadvertently and mistakenly changed to 4315 'int_fast32_t'. (Thanks to Christos Zoulas.) 4316 4317 The code avoids undefined behavior on integer overflow in some 4318 more places, including gmtime, localtime, mktime and zdump. 4319 4320 Changes affecting the zdump utility 4321 4322 zdump now outputs "UT" when referring to Universal Time, not "UTC". 4323 "UTC" does not make sense for timestamps that predate the introduction 4324 of UTC, whereas "UT", a more generic term, does. (Thanks to Steve Allen 4325 for clarifying UT vs UTC.) 4326 4327 Data changes affecting behavior of tzselect and similar programs 4328 4329 Country code BQ is now called the more common name "Caribbean Netherlands" 4330 rather than the more official "Bonaire, St Eustatius & Saba". 4331 4332 Remove from zone.tab the names America/Montreal, America/Shiprock, 4333 and Antarctica/South_Pole, as they are equivalent to existing 4334 same-country-code zones for post-1970 timestamps. The data entries for 4335 these names are unchanged, so the names continue to work as before. 4336 4337 Changes affecting code internals 4338 4339 zic -c now runs way faster on 64-bit hosts when given large numbers. 4340 4341 zic now uses vfprintf to avoid allocating and freeing some memory. 4342 4343 tzselect now computes the list of continents from the data, 4344 rather than have it hard-coded. 4345 4346 Minor changes pacify GCC 4.7.3 and GCC 4.8.1. 4347 4348 Changes affecting the build procedure 4349 4350 The 'leapseconds' file is now generated automatically from a 4351 new file 'leap-seconds.list', which is a copy of 4352 <ftp://ftp.nist.gov/pub/time/leap-seconds.list> 4353 A new source file 'leapseconds.awk' implements this. 4354 The goal is simplification of the future maintenance of 'leapseconds'. 4355 4356 When building the 'posix' or 'right' subdirectories, if the 4357 subdirectory would be a copy of the default subdirectory, it is 4358 now made a symbolic link if that is supported. This saves about 4359 2 MB of file system space. 4360 4361 The links America/Shiprock and Antarctica/South_Pole have been 4362 moved to the 'backward' file. This affects only nondefault builds 4363 that omit 'backward'. 4364 4365 Changes affecting version-control only 4366 4367 .gitignore now ignores 'date'. 4368 4369 Changes affecting documentation and commentary 4370 4371 Changes to the 'tzfile' man page 4372 4373 It now mentions that the binary file format may be extended in 4374 future versions by appending data. 4375 4376 It now refers to the 'zdump' and 'zic' man pages. 4377 4378 Changes to the 'zic' man page 4379 4380 It lists conditions that elicit a warning with '-v'. 4381 4382 It says that the behavior is unspecified when duplicate names 4383 are given, or if the source of one link is the target of another. 4384 4385 Its examples are updated to match the latest data. 4386 4387 The definition of white space has been clarified slightly. 4388 (Thanks to Michael Deckers.) 4389 4390 Changes to the 'Theory' file 4391 4392 There is a new section about the accuracy of the tz database, 4393 describing the many ways that errors can creep in, and 4394 explaining why so many of the pre-1970 timestamps are wrong or 4395 misleading (thanks to Steve Allen, Lester Caine, and Garrett 4396 Wollman for discussions that contributed to this). 4397 4398 The 'Theory' file describes LMT better (this follows a 4399 suggestion by Guy Harris). 4400 4401 It refers to the 2013 edition of POSIX rather than the 2004 edition. 4402 4403 It's mentioned that excluding 'backward' should not affect the 4404 other data, and it suggests at least one zone.tab name per 4405 inhabited country (thanks to Stephen Colebourne). 4406 4407 Some longstanding restrictions on names are documented, e.g., 4408 'America/New_York' precludes 'America/New_York/Bronx'. 4409 4410 It gives more reasons for the 1970 cutoff. 4411 4412 It now mentions which time_t variants are supported, such as 4413 signed integer time_t. (Thanks to Paul Goyette for reporting 4414 typos in an experimental version of this change.) 4415 4416 (Thanks to Philip Newton for correcting typos in these changes.) 4417 4418 Documentation and commentary is more careful to distinguish UT in 4419 general from UTC in particular. (Thanks to Steve Allen.) 4420 4421 Add a better source for the Zurich 1894 transition. 4422 (Thanks to Pierre-Yves Berger.) 4423 4424 Update shapefile citations in tz-link.htm. (Thanks to Guy Harris.) 4425 4426 4427 Release 2013d - 2013-07-05 07:38:01 -0700 4428 4429 Changes affecting future timestamps: 4430 4431 Morocco's midsummer transitions this year are July 7 and August 10, 4432 not July 9 and August 8. (Thanks to Andrew Paprocki.) 4433 4434 Israel now falls back on the last Sunday of October. 4435 (Thanks to Ephraim Silverberg.) 4436 4437 Changes affecting past timestamps: 4438 4439 Specify Jerusalem's location more precisely; this changes the pre-1880 4440 times by 2 s. 4441 4442 Changing affecting metadata only: 4443 4444 Fix typos in the entries for country codes BQ and SX. 4445 4446 Changes affecting code: 4447 4448 Rework the code to fix a bug with handling Australia/Macquarie on 4449 32-bit hosts (thanks to Arthur David Olson). 4450 4451 Port to platforms like NetBSD, where time_t can be wider than long. 4452 4453 Add support for testing time_t types other than the system's. 4454 Run 'make check_time_t_alternatives' to try this out. 4455 Currently, the tests fail for unsigned time_t; 4456 this should get fixed at some point. 4457 4458 Changes affecting documentation and commentary: 4459 4460 Deemphasize the significance of national borders. 4461 4462 Update the zdump man page. 4463 4464 Remove obsolete NOID comment (thanks to Denis Excoffier). 4465 4466 Update several URLs and comments in the web pages. 4467 4468 Spelling fixes (thanks to Kevin Lyda and Jonathan Leffler). 4469 4470 Update URL for CLDR Zone->Tzid table (thanks to Yoshito Umaoka). 4471 4472 4473 Release 2013c - 2013-04-19 16:17:40 -0700 4474 4475 Changes affecting current and future timestamps: 4476 4477 Palestine observed DST starting March 29, 2013. (Thanks to 4478 Steffen Thorsen.) From 2013 on, Gaza and Hebron both observe DST, 4479 with the predicted rules being the last Thursday in March at 24:00 4480 to the first Friday on or after September 21 at 01:00. 4481 4482 Assume that the recent change to Paraguay's DST rules is permanent, 4483 by moving the end of DST to the 4th Sunday in March every year. 4484 (Thanks to Carlos Ral Perasso.) 4485 4486 Changes affecting past timestamps: 4487 4488 Fix some historical data for Palestine to agree with that of 4489 timeanddate.com, as follows: 4490 4491 The spring 2008 change in Gaza and Hebron was on 00:00 Mar 28, not 4492 00:00 Apr 1. 4493 4494 The fall 2009 change in Gaza and Hebron on Sep 4 was at 01:00, not 4495 02:00. 4496 4497 The spring 2010 change in Hebron was 00:00 Mar 26, not 00:01 Mar 27. 4498 4499 The spring 2011 change in Gaza was 00:01 Apr 1, not 12:01 Apr 2. 4500 4501 The spring 2011 change in Hebron on Apr 1 was at 00:01, not 12:01. 4502 4503 The fall 2011 change in Hebron on Sep 30 was at 00:00, not 03:00. 4504 4505 Fix times of habitation for Macquarie to agree with the Tasmania 4506 Parks & Wildlife Service history, which indicates that permanent 4507 habitation was 1899-1919 and 1948 on. 4508 4509 Changing affecting metadata only: 4510 4511 Macquarie Island is politically part of Australia, not Antarctica. 4512 (Thanks to Tobias Conradi.) 4513 4514 Sort Macquarie more consistently with other parts of Australia. 4515 (Thanks to Tim Parenti.) 4516 4517 4518 Release 2013b - 2013-03-10 22:33:40 -0700 4519 4520 Changes affecting current and future timestamps: 4521 4522 Haiti uses US daylight-saving rules this year, and presumably future years. 4523 This changes timestamps starting today. (Thanks to Steffen Thorsen.) 4524 4525 Paraguay will end DST on March 24 this year. 4526 (Thanks to Steffen Thorsen.) For now, assume it's just this year. 4527 4528 Morocco does not observe DST during Ramadan; 4529 try to predict Ramadan in Morocco as best we can. 4530 (Thanks to Erik Homoet for the heads-up.) 4531 4532 Changes affecting commentary: 4533 4534 Update URLs in tz-link page. Add URLs for webOS, BB10, iOS. 4535 Update URL for Solaris. Mention Internet RFC 6557. 4536 Update Internet RFCs 2445->5545, 2822->5322. 4537 Switch from FTP to HTTP for Internet RFCs. 4538 4539 4540 Release 2013a - 2013-02-27 09:20:35 -0800 4541 4542 Change affecting binary data format: 4543 4544 The zone offset at the end of version-2-format zone files is now 4545 allowed to be 24:00, as per POSIX.1-2008. (Thanks to Arthur David Olson.) 4546 4547 Changes affecting current and future timestamps: 4548 4549 Chile's 2013 rules, and we guess rules for 2014 and later, will be 4550 the same as 2012, namely Apr Sun>=23 03:00 UTC to Sep Sun>=2 04:00 UTC. 4551 (Thanks to Steffen Thorsen and Robert Elz.) 4552 4553 New Zones Asia/Khandyga, Asia/Ust-Nera, Europe/Busingen. 4554 (Thanks to Tobias Conradi and Arthur David Olson.) 4555 4556 Many changes affect historical timestamps before 1940. 4557 These were deduced from: Milne J. Civil time. Geogr J. 1899 4558 Feb;13(2):173-94 <https://www.jstor.org/stable/1774359>. 4559 4560 Changes affecting the code: 4561 4562 Fix zic bug that mishandled Egypt's 2010 changes (this also affected 4563 the data). (Thanks to Arthur David Olson.) 4564 4565 Fix localtime bug when time_t is unsigned and data files were generated 4566 by a signed time_t system. (Thanks to Doug Bailey for reporting and 4567 to Arthur David Olson for fixing.) 4568 4569 Allow the email address for bug reports to be set by the packager. 4570 The default is tz (a] iana.org, as before. (Thanks to Joseph S. Myers.) 4571 4572 Update HTML checking to be compatible with Ubuntu 12.10. 4573 4574 Check that files are a safe subset of ASCII. At some point we may 4575 relax this requirement to a safe subset of UTF-8. Without the 4576 check, some non-UTF-8 encodings were leaking into the distribution. 4577 4578 Commentary changes: 4579 4580 Restore a comment about copyright notices that was inadvertently deleted. 4581 (Thanks to Arthur David Olson.) 4582 4583 Improve the commentary about which districts observe what times 4584 in Russia. (Thanks to Oscar van Vlijmen and Arthur David Olson.) 4585 4586 Add web page links to tz.js. 4587 4588 Add "Run by the Monkeys" to tz-art. (Thanks to Arthur David Olson.) 4589 4590 4591 Release 2012j - 2012-11-12 18:34:49 -0800 4592 4593 Libya moved to CET this weekend, but with DST planned next year. 4594 (Thanks to Even Scharning, Steffen Thorsen, and Tim Parenti.) 4595 4596 Signatures now have the extension .asc, not .sign, as that's more 4597 standard. (Thanks to Phil Pennock.) 4598 4599 The output of 'zdump --version', and of 'zic --version', now 4600 uses a format that is more typical for --version. 4601 (Thanks to Joseph S. Myers.) 4602 4603 The output of 'tzselect --help', 'zdump --help', and 'zic --help' 4604 now uses tz (a] iana.org rather than the old elsie address. 4605 4606 zic -v now complains about abbreviations that are less than 3 4607 or more than 6 characters, as per POSIX. Formerly, it checked 4608 for abbreviations that were more than 3. 4609 4610 'make public' no longer puts its temporary directory under /tmp, 4611 and uses the just-built zic rather than the system zic. 4612 4613 Various fixes to documentation and commentary. 4614 4615 4616 Release 2012i - 2012-11-03 12:57:09 -0700 4617 4618 Cuba switches from DST tomorrow at 01:00. (Thanks to Steffen Thorsen.) 4619 4620 Linker flags can now be specified via LDFLAGS. 4621 AWK now defaults to 'awk', not 'nawk'. 4622 The shell in tzselect now defaults to /bin/bash, but this can 4623 be overridden by specifying KSHELL. 4624 The main web page now mentions the unofficial GitHub repository. 4625 (Thanks to Mike Frysinger.) 4626 4627 Tarball signatures can now be built by running 'make signatures'. 4628 There are also new makefile rules 'tarballs', 'check_public', and 4629 separate makefile rules for each tarball and signature file. 4630 A few makefile rules are now more portable to strict POSIX. 4631 4632 The main web page now lists the canonical IANA URL. 4633 4634 4635 Release 2012h - 2012-10-26 22:49:10 -0700 4636 4637 Bahia no longer has DST. (Thanks to Kelley Cook.) 4638 4639 Tocantins has DST. (Thanks to Rodrigo Severo.) 4640 4641 Israel has new DST rules next year. (Thanks to Ephraim Silverberg.) 4642 4643 Jordan stays on DST this winter. (Thanks to Steffen Thorsen.) 4644 4645 Web page updates. 4646 4647 More C modernization, except that at Arthur David Olson's suggestion 4648 the instances of 'register' were kept. 4649 4650 4651 Release 2012g - 2012-10-17 20:59:45 -0700 4652 4653 Samoa fall 2012 and later. (Thanks to Nicholas Pereira and Robert Elz.) 4654 4655 Palestine fall 2012. (Thanks to Steffen Thorsen.) 4656 4657 Assume C89. 4658 4659 To attack the version-number problem, this release ships the file 4660 'Makefile' (which contains the release number) in both the tzcode and 4661 the tzdata tarballs. The two Makefiles are identical, and should be 4662 identical in any matching pair of tarballs, so it shouldn't matter 4663 which order you extract the tarballs. Perhaps we can come up with a 4664 better version-number scheme at some point; this scheme does have the 4665 virtue of not adding more files. 4666 4667 4668 Release 2012f - 2012-09-12 23:17:03 -0700 4669 4670 * australasia (Pacific/Fiji): Fiji DST is October 21 through January 4671 20 this year. (Thanks to Steffen Thorsen.) 4672 4673 4674 Release 2012e - 2012-08-02 20:44:55 -0700 4675 4676 * australasia (Pacific/Fakaofo): Tokelau is UT +13, not +14. 4677 (Thanks to Steffen Thorsen.) 4678 4679 * Use a single version number for both code and data. 4680 4681 * .gitignore: New file. 4682 4683 * Remove trailing white space. 4684 4685 4686 Release code2012c-data2012d - 2012-07-19 16:35:33 -0700 4687 4688 Changes for Morocco's timestamps, which take effect in a couple of 4689 hours, along with infrastructure changes to accommodate how the tz 4690 code and data are released on IANA. 4691 4692 4693 Release data2012c - 2012-03-27 12:17:25 -0400 4694 4695 africa 4696 Summer time changes for Morocco (to start late April 2012) 4697 4698 asia 4699 Changes for 2012 for Gaza & the West Bank (Hebron) and Syria 4700 4701 northamerica 4702 Haiti following US/Canada rules for 2012 (and we're assuming, 4703 for now anyway, for the future). 4704 4705 4706 Release 2012b - 2012-03-02 12:29:15 +0700 4707 4708 There is just one change to tzcode2012b (compared with 2012a): 4709 the Makefile that was accidentally included with 2012a has been 4710 replaced with the version that should have been there, which is 4711 identical with the previous version (from tzcode2011i). 4712 4713 There are just two changes in tzdata2012b compared with 2012a. 4714 4715 Most significantly, summer time in Cuba has been delayed 3 weeks 4716 (now starts April 1 rather than March 11). Since Mar 11 (the old start 4717 date, as listed in 2012a) is just a little over a week away, this 4718 change is urgent. 4719 4720 Less importantly, an excess tab in one of the changes in zone.tab 4721 in 2012a has been removed. 4722 4723 4724 Release 2012a - 2012-03-01 18:28:10 +0700 4725 4726 The changes in tzcode2012a (compared to the previous version, 2011i) 4727 are entirely to the README and tz-art.htm and tz-link.htm files, if 4728 none of those concern you, you can ignore the code update. The changes 4729 reflect the changed addresses for the mailing list and the code and 4730 data distribution points & methods (and a link to DateTime::TimeZone::Tzfile 4731 has been added to tz-link.htm). 4732 4733 In tzdata2012a (compared to the previous release, which was 2011n) 4734 the major changes are: 4735 Chile 2011/2012 and 2012/2013 summer time date adjustments. 4736 Falkland Islands onto permanent summer time (we're assuming for the 4737 foreseeable future, though 2012 is all we're fairly certain of.) 4738 Armenia has abolished Summer Time. 4739 Tokelau jumped the International Date Line back last December 4740 (just the same as their near neighbour, Samoa). 4741 America/Creston is a new zone for a small area of British Columbia 4742 There will be a leapsecond 2012-06-30 23:59:60 UTC. 4743 4744 Other minor changes are: 4745 Corrections to 1918 Canadian summer time end dates. 4746 Updated URL for UK time zone history (in comments) 4747 A few typos in Le Corre's list of free French place names (comments) 4748 4749 4750 Release data2011n - 2011-10-30 14:57:54 +0700 4751 4752 There are three changes of note - most urgently, Cuba (America/Havana) 4753 has extended summer time by two weeks, now to end on Nov 13, rather than 4754 the (already past) Oct 30. Second, the Pridnestrovian Moldavian Republic 4755 (Europe/Tiraspol) decided not to split from the rest of Moldova after 4756 all, and consequently that zone has been removed (again) and reinstated 4757 in the "backward" file as a link to Europe/Chisinau. And third, the 4758 end date for Fiji's summer time this summer was moved forward from the 4759 earlier planned Feb 26, to Jan 22. 4760 4761 Apart from that, Moldova (MD) returns to a single entry in zone.tab 4762 (and the incorrect syntax that was in the 2011m version of that file 4763 is so fixed - it would have been fixed in a different way had this 4764 change not happened - that's the "missing" sccs version id). 4765 4766 4767 Release data2011m - 2011-10-24 21:42:16 +0700 4768 4769 In particular, the typos in comments in the data (2011-11-17 should have 4770 been 2011-10-17 as Alan Barrett noted, and spelling of Tiraspol that 4771 Tim Parenti noted) have been fixed, and the change for Ukraine has been 4772 made in all 4 Ukrainian zones, rather than just Europe/Kiev 4773 (again, thanks to Tim Parenti, and also Denys Gavrysh). 4774 4775 In addition, I added Europe/Tiraspol to zone.tab. 4776 4777 This time, all the files have new version numbers... (including the files 4778 otherwise unchanged in 2011m that were changed in 2011l but didn't get new 4779 version numbers there...) 4780 4781 4782 Release data2011l - 2011-10-10 11:15:43 +0700 4783 4784 There are just 2 changes that cause different generated tzdata files from 4785 zic, to Asia/Hebron and Pacific/Fiji - the possible change for Bahia, Brazil 4786 is included, but commented out. Compared with the diff I sent out last week, 4787 this version also includes attributions for the sources for the changes 4788 (in much the same format as ado used, but the html tags have not been 4789 checked, verified, or used in any way at all, so if there are errors there, 4790 please let me know.) 4791 4792 4793 Release data2011k - 2011-09-20 17:54:03 -0400 4794 4795 [not summarized] 4796 4797 4798 Release data2011j - 2011-09-12 09:22:49 -0400 4799 4800 (contemporary changes for Samoa; past changes for Kenya, Uganda, and 4801 Tanzania); there are also two spelling corrections to comments in 4802 the australasia file (with thanks to Christos Zoulas). 4803 4804 4805 Release 2011i - 2011-08-29 05:56:32 -0400 4806 4807 [not summarized] 4808 4809 4810 Release data2011h - 2011-06-15 18:41:48 -0400 4811 4812 Russia and Curaao changes 4813 4814 4815 Release 2011g - 2011-04-25 09:07:22 -0400 4816 4817 update the rules for Egypt to reflect its abandonment of DST this year 4818 4819 4820 Release 2011f - 2011-04-06 17:14:53 -0400 4821 4822 [not summarized] 4823 4824 4825 Release 2011e - 2011-03-31 16:04:38 -0400 4826 4827 Morocco, Chile, and tz-link changes 4828 4829 4830 Release 2011d - 2011-03-14 09:18:01 -0400 4831 4832 changes that impact present-day timestamps in Cuba, Samoa, and Turkey 4833 4834 4835 Release 2011c - 2011-03-07 09:30:09 -0500 4836 4837 These do affect current timestamps in Chile and Annette Island, Canada. 4838 4839 4840 Release 2011b - 2011-02-07 08:44:50 -0500 4841 4842 [not summarized] 4843 4844 4845 Release 2011a - 2011-01-24 10:30:16 -0500 4846 4847 [not summarized] 4848 4849 4850 Release data2010o - 2010-11-01 09:18:23 -0400 4851 4852 change to the end of DST in Fiji in 2011 4853 4854 4855 Release 2010n - 2010-10-25 08:19:17 -0400 4856 4857 [not summarized] 4858 4859 4860 Release 2010m - 2010-09-27 09:24:48 -0400 4861 4862 Hong Kong, Vostok, and zic.c changes 4863 4864 4865 Release 2010l - 2010-08-16 06:57:25 -0400 4866 4867 [not summarized] 4868 4869 4870 Release 2010k - 2010-07-26 10:42:27 -0400 4871 4872 [not summarized] 4873 4874 4875 Release 2010j - 2010-05-10 09:07:48 -0400 4876 4877 changes for Baha de Banderas and for version naming 4878 4879 4880 Release data2010i - 2010-04-16 18:50:45 -0400 4881 4882 the end of DST in Morocco on 2010-08-08 4883 4884 4885 Release data2010h - 2010-04-05 09:58:56 -0400 4886 4887 [not summarized] 4888 4889 4890 Release data2010g - 2010-03-24 11:14:53 -0400 4891 4892 [not summarized] 4893 4894 4895 Release 2010f - 2010-03-22 09:45:46 -0400 4896 4897 [not summarized] 4898 4899 4900 Release data2010e - 2010-03-08 14:24:27 -0500 4901 4902 corrects the Dhaka bug found by Danvin Ruangchan 4903 4904 4905 Release data2010d - 2010-03-06 07:26:01 -0500 4906 4907 [not summarized] 4908 4909 4910 Release 2010c - 2010-03-01 09:20:58 -0500 4911 4912 changes including KRE's suggestion for earlier initialization of 4913 "goahead" and "goback" structure elements 4914 4915 4916 Release code2010a - 2010-02-16 10:40:04 -0500 4917 4918 [not summarized] 4919 4920 4921 Release data2010b - 2010-01-20 12:37:01 -0500 4922 4923 Mexico changes 4924 4925 4926 Release data2010a - 2010-01-18 08:30:04 -0500 4927 4928 changes to Dhaka 4929 4930 4931 Release data2009u - 2009-12-26 08:32:28 -0500 4932 4933 changes to DST in Bangladesh 4934 4935 4936 Release 2009t - 2009-12-21 13:24:27 -0500 4937 4938 [not summarized] 4939 4940 4941 Release data2009s - 2009-11-14 10:26:32 -0500 4942 4943 (cosmetic) Antarctica change and the DST-in-Fiji-in-2009-and-2010 change 4944 4945 4946 Release 2009r - 2009-11-09 10:10:31 -0500 4947 4948 "antarctica" and "tz-link.htm" changes 4949 4950 4951 Release 2009q - 2009-11-02 09:12:40 -0500 4952 4953 with two corrections as reported by Eric Muller and Philip Newton 4954 4955 4956 Release data2009p - 2009-10-23 15:05:27 -0400 4957 4958 Argentina (including San Luis) changes (with the correction from 4959 Mariano Absatz) 4960 4961 4962 Release data2009o - 2009-10-14 16:49:38 -0400 4963 4964 Samoa (commentary only), Pakistan, and Bangladesh changes 4965 4966 4967 Release data2009n - 2009-09-22 15:13:38 -0400 4968 4969 added commentary for Argentina and a change to the end of DST in 4970 2009 in Pakistan 4971 4972 4973 Release data2009m - 2009-09-03 10:23:43 -0400 4974 4975 Samoa and Palestine changes 4976 4977 4978 Release data2009l - 2009-08-14 09:13:07 -0400 4979 4980 Samoa (comments only) and Egypt 4981 4982 4983 Release 2009k - 2009-07-20 09:46:08 -0400 4984 4985 [not summarized] 4986 4987 4988 Release data2009j - 2009-06-15 06:43:59 -0400 4989 4990 Bangladesh change (with a short turnaround since the DST change is 4991 impending) 4992 4993 4994 Release 2009i - 2009-06-08 09:21:22 -0400 4995 4996 updating for DST in Bangladesh this year 4997 4998 4999 Release 2009h - 2009-05-26 09:19:14 -0400 5000 5001 [not summarized] 5002 5003 5004 Release data2009g - 2009-04-20 16:34:07 -0400 5005 5006 Cairo 5007 5008 5009 Release data2009f - 2009-04-10 11:00:52 -0400 5010 5011 correct DST in Pakistan 5012 5013 5014 Release 2009e - 2009-04-06 09:08:11 -0400 5015 5016 [not summarized] 5017 5018 5019 Release 2009d - 2009-03-23 09:38:12 -0400 5020 5021 Morocco, Tunisia, Argentina, and American Astronomical Society changes 5022 5023 5024 Release data2009c - 2009-03-16 09:47:51 -0400 5025 5026 change to the start of Cuban DST 5027 5028 5029 Release 2009b - 2009-02-09 11:15:22 -0500 5030 5031 [not summarized] 5032 5033 5034 Release 2009a - 2009-01-21 10:09:39 -0500 5035 5036 [not summarized] 5037 5038 5039 Release data2008i - 2008-10-21 12:10:25 -0400 5040 5041 southamerica and zone.tab files, with Argentina DST rule changes and 5042 United States zone reordering and recommenting 5043 5044 5045 Release 2008h - 2008-10-13 07:33:56 -0400 5046 5047 [not summarized] 5048 5049 5050 Release 2008g - 2008-10-06 09:03:18 -0400 5051 5052 Fix a broken HTML anchor and update Brazil's DST transitions; 5053 there's also a slight reordering of information in tz-art.htm. 5054 5055 5056 Release data2008f - 2008-09-09 22:33:26 -0400 5057 5058 [not summarized] 5059 5060 5061 Release 2008e - 2008-07-28 14:11:17 -0400 5062 5063 changes by Arthur David Olson and Jesper Nrgaard Welen 5064 5065 5066 Release data2008d - 2008-07-07 09:51:38 -0400 5067 5068 changes by Arthur David Olson, Paul Eggert, and Rodrigo Severo 5069 5070 5071 Release data2008c - 2008-05-19 17:48:03 -0400 5072 5073 Pakistan, Morocco, and Mongolia 5074 5075 5076 Release data2008b - 2008-03-24 08:30:59 -0400 5077 5078 including renaming Asia/Calcutta to Asia/Kolkata, with a backward 5079 link provided 5080 5081 5082 Release 2008a - 2008-03-08 05:42:16 -0500 5083 5084 [not summarized] 5085 5086 5087 Release 2007k - 2007-12-31 10:25:22 -0500 5088 5089 most importantly, changes to the "southamerica" file based on 5090 Argentina's readoption of daylight saving time 5091 5092 5093 Release 2007j - 2007-12-03 09:51:01 -0500 5094 5095 1. eliminate the "P" (parameter) macro; 5096 5097 2. the "noncontroversial" changes circulated on the time zone 5098 mailing list (less the changes to "logwtmp.c"); 5099 5100 3. eliminate "too many transition" errors when "min" is used in time 5101 zone rules; 5102 5103 4. changes by Paul Eggert (including updated information for Venezuela). 5104 5105 5106 Release data2007i - 2007-10-30 10:28:11 -0400 5107 5108 changes for Cuba and Syria 5109 5110 5111 Release 2007h - 2007-10-01 10:05:51 -0400 5112 5113 changes by Paul Eggert, as well as an updated link to the ICU 5114 project in tz-link.htm 5115 5116 5117 Release 2007g - 2007-08-20 10:47:59 -0400 5118 5119 changes by Paul Eggert 5120 5121 The "leapseconds" file has been updated to incorporate the most 5122 recent International Earth Rotation and Reference Systems Service 5123 (IERS) bulletin. 5124 5125 There's an addition to tz-art.htm regarding the television show "Medium". 5126 5127 5128 Release 2007f - 2007-05-07 10:46:46 -0400 5129 5130 changes by Paul Eggert (including Haiti, Turks and Caicos, and New 5131 Zealand) 5132 5133 changes to zic.c to allow hour values greater than 24 (along with 5134 Paul's improved time value overflow checking) 5135 5136 5137 Release 2007e - 2007-04-02 10:11:52 -0400 5138 5139 Syria and Honduras changes by Paul Eggert 5140 5141 zic.c variable renaming changes by Arthur David Olson 5142 5143 5144 Release 2007d - 2007-03-20 08:48:30 -0400 5145 5146 changes by Paul Eggert 5147 5148 the elimination of white space at the ends of lines 5149 5150 5151 Release 2007c - 2007-02-26 09:09:37 -0500 5152 5153 changes by Paul Eggert 5154 5155 5156 Release 2007b - 2007-02-12 09:34:20 -0500 5157 5158 Paul Eggert's proposed change to the quotation handling logic in zic.c. 5159 5160 changes to the commentary in "leapseconds" reflecting the IERS 5161 announcement that there is to be no positive leap second at the end 5162 of June 2007. 5163 5164 5165 Release 2007a - 2007-01-08 12:28:29 -0500 5166 5167 changes by Paul Eggert 5168 5169 Derick Rethans's Asmara change 5170 5171 Oscar van Vlijmen's Easter Island local mean time change 5172 5173 symbolic link changes 5174 5175 5176 Release 2006p - 2006-11-27 08:54:27 -0500 5177 5178 changes by Paul Eggert 5179 5180 5181 Release 2006o - 2006-11-06 09:18:07 -0500 5182 5183 changes by Paul Eggert 5184 5185 5186 Release 2006n - 2006-10-10 11:32:06 -0400 5187 5188 changes by Paul Eggert 5189 5190 5191 Release 2006m - 2006-10-02 15:32:35 -0400 5192 5193 changes for Uruguay, Palestine, and Egypt by Paul Eggert 5194 5195 (minimalist) changes to zic.8 to clarify "until" information 5196 5197 5198 Release data2006l - 2006-09-18 12:58:11 -0400 5199 5200 Paul's best-effort work on this coming weekend's Egypt time change 5201 5202 5203 Release 2006k - 2006-08-28 12:19:09 -0400 5204 5205 changes by Paul Eggert 5206 5207 5208 Release 2006j - 2006-08-21 09:56:32 -0400 5209 5210 changes by Paul Eggert 5211 5212 5213 Release code2006i - 2006-08-07 12:30:55 -0400 5214 5215 localtime.c fixes 5216 5217 Ken Pizzini's conversion script 5218 5219 5220 Release code2006h - 2006-07-24 09:19:37 -0400 5221 5222 adds public domain notices to four files 5223 5224 includes a fix for transition times being off by a second 5225 5226 adds a new recording to the "arts" file (information courtesy Colin Bowern) 5227 5228 5229 Release 2006g - 2006-05-08 17:18:09 -0400 5230 5231 northamerica changes by Paul Eggert 5232 5233 5234 Release 2006f - 2006-05-01 11:46:00 -0400 5235 5236 a missing version number problem is fixed (with thanks to Bradley 5237 White for catching the problem) 5238 5239 5240 Release 2006d - 2006-04-17 14:33:43 -0400 5241 5242 changes by Paul Eggert 5243 5244 added new items to tz-arts.htm that were found by Paul 5245 5246 5247 Release 2006c - 2006-04-03 10:09:32 -0400 5248 5249 two sets of data changes by Paul Eggert 5250 5251 a fencepost error fix in zic.c 5252 5253 changes to zic.c and the "europe" file to minimize differences 5254 between output produced by the old 32-bit zic and the new 64-bit 5255 version 5256 5257 5258 Release 2006b - 2006-02-20 10:08:18 -0500 5259 [tz32code2006b + tz64code2006b + tzdata2006b] 5260 5261 64-bit code 5262 5263 All SCCS IDs were bumped to "8.1" for this release. 5264 5265 5266 Release 2006a - 2006-01-30 08:59:31 -0500 5267 5268 changes by Paul Eggert (in particular, Indiana time zone moves) 5269 5270 an addition to the zic manual page to describe how special-case 5271 transitions are handled 5272 5273 5274 Release 2005r - 2005-12-27 09:27:13 -0500 5275 5276 Canadian changes by Paul Eggert 5277 5278 They also add "<pre>" directives to time zone data files and reflect 5279 changes to warning message logic in "zdump.c" (but with calls to 5280 "gettext" kept unbundled at the suggestion of Ken Pizzini). 5281 5282 5283 Release 2005q - 2005-12-13 09:17:09 -0500 5284 5285 Nothing earth-shaking here: 5286 1. Electronic mail addresses have been removed. 5287 2. Casts of the return value of exit have been removed. 5288 3. Casts of the argument of is.* macros have been added. 5289 4. Indentation in one section of zic.c has been fixed. 5290 5. References to dead URLs in the data files have been dealt with. 5291 5292 5293 Release 2005p - 2005-12-05 10:30:53 -0500 5294 5295 "systemv", "tz-link.htm", and "zdump.c" changes 5296 (less the casts of arguments to the is* macros) 5297 5298 5299 Release 2005o - 2005-11-28 10:55:26 -0500 5300 5301 Georgia, Cuba, Nicaragua, and Jordan changes by Paul Eggert 5302 5303 zdump.c lint fixes by Arthur David Olson 5304 5305 5306 Release 2005n - 2005-10-03 09:44:09 -0400 5307 5308 changes by Paul Eggert (both the Uruguay changes and the Kyrgyzstan 5309 et al. changes) 5310 5311 5312 Release 2005m - 2005-08-29 12:15:40 -0400 5313 5314 changes by Paul Eggert (with a small tweak to the tz-art change) 5315 5316 a declaration of an unused variable has been removed from zdump.c 5317 5318 5319 Release 2005l - 2005-08-22 12:06:39 -0400 5320 5321 changes by Paul Eggert 5322 5323 overflow/underflow checks by Arthur David Olson, minus changes to 5324 the "Theory" file about the pending addition of 64-bit data (I grow 5325 less confident of the changes being accepted with each passing day, 5326 and the changes no longer increase the data files nine-fold--there's 5327 less than a doubling in size by my local Sun's reckoning) 5328 5329 5330 Release 2005k - 2005-07-14 14:14:24 -0400 5331 5332 The "leapseconds" file has been edited to reflect the recently 5333 announced leap second at the end of 2005. 5334 5335 I've also deleted electronic mail addresses from the files as an 5336 anti-spam measure. 5337 5338 5339 Release 2005j - 2005-06-13 14:34:13 -0400 5340 5341 These reflect changes to limit the length of time zone abbreviations 5342 and the characters used in those abbreviations. 5343 5344 There are also changes to handle POSIX-style "quoted" timezone 5345 environment variables. 5346 5347 The changes were circulated on the time zone mailing list; the only 5348 change since then was the removal of a couple of minimum-length of 5349 abbreviation checks. 5350 5351 5352 Release data2005i - 2005-04-21 15:04:16 -0400 5353 5354 changes (most importantly to Nicaragua and Haiti) by Paul Eggert 5355 5356 5357 Release 2005h - 2005-04-04 11:24:47 -0400 5358 5359 changes by Paul Eggert 5360 5361 minor changes to Makefile and zdump.c to produce more useful output 5362 when doing a "make typecheck" 5363 5364 5365 Release 2005g - 2005-03-14 10:11:21 -0500 5366 5367 changes by Paul Eggert (a change to current DST rules in Uruguay and 5368 an update to a link to time zone software) 5369 5370 5371 Release 2005f - 2005-03-01 08:45:32 -0500 5372 5373 data and documentation changes by Paul Eggert 5374 5375 5376 Release 2005e - 2005-02-10 15:59:44 -0500 5377 5378 [not summarized] 5379 5380 5381 Release code2005d - 2005-01-31 09:21:47 -0500 5382 5383 make zic complain about links to links if the -v flag is used 5384 5385 have "make public" do more code checking 5386 5387 add an include to "localtime.c" for the benefit of gcc systems 5388 5389 5390 Release 2005c - 2005-01-17 18:36:29 -0500 5391 5392 get better results when mktime runs on a system where time_t is double 5393 5394 changes to the data files (most importantly to Paraguay) 5395 5396 5397 Release 2005b - 2005-01-10 09:19:54 -0500 5398 5399 Get localtime and gmtime working on systems with exotic time_t types. 5400 5401 Update the leap second commentary in the "leapseconds" file. 5402 5403 5404 Release 2005a - 2005-01-01 13:13:44 -0500 5405 5406 [not summarized] 5407 5408 5409 Release code2004i - 2004-12-14 13:42:58 -0500 5410 5411 Deal with systems where time_t is unsigned. 5412 5413 5414 Release code2004h - 2004-12-07 11:40:18 -0500 5415 5416 64-bit-time_t changes 5417 5418 5419 Release 2004g - 2004-11-02 09:06:01 -0500 5420 5421 update to Cuba (taking effect this weekend) 5422 5423 other changes by Paul Eggert 5424 5425 correction of the spelling of Oslo 5426 5427 changed versions of difftime.c and private.h 5428 5429 5430 Release code2004f - 2004-10-21 10:25:22 -0400 5431 5432 Cope with wide-ranging tm_year values. 5433 5434 5435 Release 2004e - 2004-10-11 14:47:21 -0400 5436 5437 Brazil/Argentina/Israel changes by Paul Eggert 5438 5439 changes to tz-link.htm by Paul 5440 5441 one small fix to Makefile 5442 5443 5444 Release 2004d - 2004-09-22 08:27:29 -0400 5445 5446 Avoid overflow problems when TM_YEAR_BASE is added to an integer. 5447 5448 5449 Release 2004c - 2004-08-11 12:06:26 -0400 5450 5451 asctime-related changes 5452 5453 (variants of) some of the documentation changes suggested by Paul Eggert 5454 5455 5456 Release 2004b - 2004-07-19 14:33:35 -0400 5457 5458 data changes by Paul Eggert - most importantly, updates for Argentina 5459 5460 5461 Release 2004a - 2004-05-27 12:00:47 -0400 5462 5463 changes by Paul Eggert 5464 5465 Handle DST transitions that occur at the end of a month in some 5466 years but at the start of the following month in other years. 5467 5468 Add a copy of the correspondence that's the basis for claims about 5469 DST in the Navajo Nation. 5470 5471 5472 Release 2003e - 2003-12-15 09:36:47 -0500 5473 5474 changes by Arthur David Olson (primarily code changes) 5475 5476 changes by Paul Eggert (primarily data changes) 5477 5478 minor changes to "Makefile" and "northamerica" (in the latter case, 5479 optimization of the "Toronto" rules) 5480 5481 5482 Release 2003d - 2003-10-06 09:34:44 -0400 5483 5484 changes by Paul Eggert 5485 5486 5487 Release 2003c - 2003-09-16 10:47:05 -0400 5488 5489 Fix bad returns in zic.c's inleap function. 5490 Thanks to Bradley White for catching the problem! 5491 5492 5493 Release 2003b - 2003-09-16 07:13:44 -0400 5494 5495 Add a "--version" option (and documentation) to the zic and zdump commands. 5496 5497 changes to overflow/underflow checking in zic 5498 5499 a localtime typo fix. 5500 5501 Update the leapseconds and tz-art.htm files. 5502 5503 5504 Release 2003a - 2003-03-24 09:30:54 -0500 5505 5506 changes by Paul Eggert 5507 5508 a few additions and modifications to the tz-art.htm file 5509 5510 5511 Release 2002d - 2002-10-15 13:12:42 -0400 5512 5513 changes by Paul Eggert, less the "Britain (UK)" change in iso3166.tab 5514 5515 There's also a new time zone quote in "tz-art.htm". 5516 5517 5518 Release 2002c - 2002-04-04 11:55:20 -0500 5519 5520 changes by Paul Eggert 5521 5522 Change zic.c to avoid creating symlinks to files that don't exist. 5523 5524 5525 Release 2002b - 2002-01-28 12:56:03 -0500 5526 5527 [These change notes are for Release 2002a, which was corrupted. 5528 2002b was a corrected version of 2002a.] 5529 5530 changes by Paul Eggert 5531 5532 Update the "leapseconds" file to note that there'll be no leap 5533 second at the end of June, 2002. 5534 5535 Change "zic.c" to deal with a problem in handling the "Asia/Bishkek" zone. 5536 5537 Change to "difftime.c" to avoid sizeof problems. 5538 5539 5540 Release 2001d - 2001-10-09 13:31:32 -0400 5541 5542 changes by Paul Eggert 5543 5544 5545 Release 2001c - 2001-06-05 13:59:55 -0400 5546 5547 changes by Paul Eggert and Andrew Brown 5548 5549 5550 Release 2001b - 2001-04-05 16:44:38 -0400 5551 5552 changes by Paul Eggert (modulo jnorgard's typo fix) 5553 5554 tz-art.htm has been HTMLified. 5555 5556 5557 Release 2001a - 2001-03-13 12:57:44 -0500 5558 5559 changes by Paul Eggert 5560 5561 An addition to the "leapseconds" file: comments with the text of the 5562 latest IERS leap second notice. 5563 5564 Trailing white space has been removed from data file lines, and 5565 repeated spaces in "Rule Jordan" lines in the "asia" file have been 5566 converted to tabs. 5567 5568 5569 Release 2000h - 2000-12-14 15:33:38 -0500 5570 5571 changes by Paul Eggert 5572 5573 one typo fix in the "art" file 5574 5575 With providence, this is the last update of the millennium. 5576 5577 5578 Release 2000g - 2000-10-10 11:35:22 -0400 5579 5580 changes by Paul Eggert 5581 5582 correction of John Mackin's name submitted by Robert Elz 5583 5584 Garry Shandling's Daylight Saving Time joke (!?!) from the recent 5585 Emmy Awards broadcast. 5586 5587 5588 Release 2000f - 2000-08-10 09:31:58 -0400 5589 5590 changes by Paul Eggert 5591 5592 Added information in "tz-art.htm" on a Seinfeld reference to DST. 5593 5594 Error checking and messages in the "yearistype" script have been 5595 improved. 5596 5597 5598 Release 2000e - 2000-07-31 09:27:54 -0400 5599 5600 data changes by Paul Eggert 5601 5602 a change to the default value of the defined constant HAVE_STRERROR 5603 5604 the addition of a Dave Barry quote on DST to the tz-arts file 5605 5606 5607 Release 2000d - 2000-04-20 15:43:04 -0400 5608 5609 changes to the documentation and code of strftime for C99 conformance 5610 5611 a bug fix for date.c 5612 5613 These are based on (though modified from) changes by Paul Eggert. 5614 5615 5616 Release 2000c - 2000-03-04 10:31:43 -0500 5617 5618 changes by Paul Eggert 5619 5620 5621 Release 2000b - 2000-02-21 12:16:29 -0500 5622 5623 changes by Paul Eggert and Joseph Myers 5624 5625 modest tweaks to the tz-art.htm and tz-link.htm files 5626 5627 5628 Release 2000a - 2000-01-18 09:21:26 -0500 5629 5630 changes by Paul Eggert 5631 5632 The two hypertext documents have also been renamed. 5633 5634 5635 Release code1999i-data1999j - 1999-11-15 18:43:22 -0500 5636 5637 Paul Eggert's changes 5638 5639 additions to the "zic" manual page and the "Arts.htm" file 5640 5641 5642 Release code1999h-data1999i - 1999-11-08 14:55:21 -0500 5643 5644 [not summarized] 5645 5646 5647 Release data1999h - 1999-10-07 03:50:29 -0400 5648 5649 changes by Paul Eggert to "europe" (most importantly, fixing 5650 Lithuania and Estonia) 5651 5652 5653 Release 1999g - 1999-09-28 11:06:18 -0400 5654 5655 data changes by Paul Eggert (most importantly, the change for 5656 Lebanon that buys correctness for this coming Sunday) 5657 5658 The "code" file contains changes to "Makefile" and "checktab.awk" to 5659 allow better checking of time zone files before they are published. 5660 5661 5662 Release 1999f - 1999-09-23 09:48:14 -0400 5663 5664 changes by Arthur David Olson and Paul Eggert 5665 5666 5667 Release 1999e - 1999-08-17 15:20:54 -0400 5668 5669 changes circulated by Paul Eggert, although the change to handling 5670 of DST-specifying timezone names has been commented out for now 5671 (search for "XXX" in "localtime.c" for details). These files also 5672 do not make any changes to the start of DST in Brazil. 5673 5674 In addition to Paul's changes, there are updates to "Arts.htm" and 5675 cleanups of URLs. 5676 5677 5678 Release 1999d - 1999-03-30 11:31:07 -0500 5679 5680 changes by Paul Eggert 5681 5682 The Makefile's "make public" rule has also been changed to do a test 5683 compile of each individual time zone data file (which should help 5684 avoid problems such as the one we had with Nicosia). 5685 5686 5687 Release 1999c - 1999-03-25 09:47:47 -0500 5688 5689 changes by Paul Eggert, most importantly the change for Chile. 5690 5691 5692 Release 1999b - 1999-02-01 17:51:44 -0500 5693 5694 changes by Paul Eggert 5695 5696 code changes (suggested by Mani Varadarajan, mani at be.com) for 5697 correct handling of symbolic links when building using a relative directory 5698 5699 code changes to generate correct messages for failed links 5700 5701 updates to the URLs in Arts.htm 5702 5703 5704 Release 1999a - 1999-01-19 16:20:29 -0500 5705 5706 error message internationalizations and corrections in zic.c and 5707 zdump.c (as suggested by Vladimir Michl, vladimir.michl at upol.cz, 5708 to whom thanks!) 5709 5710 5711 Release code1998h-data1998i - 1998-10-01 09:56:10 -0400 5712 5713 changes for Brazil, Chile, and Germany 5714 5715 support for use of "24:00" in the input files for the time zone compiler 5716 5717 5718 Release code1998g-data1998h - 1998-09-24 10:50:28 -0400 5719 5720 changes by Paul Eggert 5721 5722 correction to a define in the "private.h" file 5723 5724 5725 Release data1998g - 1998-08-11 03:28:35 -0000 5726 [tzdata1998g.tar.gz is missing!] 5727 5728 Lithuanian change provided by mgedmin at pub.osf.it 5729 5730 Move creation of the GMT link with Etc/GMT to "etcetera" (from 5731 "backward") to ensure that the GMT file is created even where folks 5732 don't want the "backward" links (as suggested by Paul Eggert). 5733 5734 5735 Release data1998f - 1998-07-20 13:50:00 -0000 5736 [tzdata1998f.tar.gz is missing!] 5737 5738 Update the "leapseconds" file to include the newly announced 5739 insertion at the end of 1998. 5740 5741 5742 Release code1998f - 1998-06-01 10:18:31 -0400 5743 5744 addition to localtime.c by Guy Harris 5745 5746 5747 Release 1998e - 1998-05-28 09:56:26 -0400 5748 5749 The Makefile is changed to produce zoneinfo-posix rather than 5750 zoneinfo/posix, and to produce zoneinfo-leaps rather than 5751 zoneinfo/right. 5752 5753 data changes by Paul Eggert 5754 5755 changes from Guy Harris to provide asctime_r and ctime_r 5756 5757 A usno1998 file (substantially identical to usno1997) has been added. 5758 5759 5760 Release 1998d - 1998-05-14 11:58:34 -0400 5761 5762 changes to comments (in particular, elimination of references to CIA maps). 5763 "Arts.htm", "WWW.htm", "asia", and "australasia" are the only places 5764 where changes occur. 5765 5766 5767 Release 1998c - 1998-02-28 12:32:26 -0500 5768 5769 changes by Paul Eggert (save the "French correction," on which I'll 5770 wait for the dust to settle) 5771 5772 symlink changes 5773 5774 changes and additions to Arts.htm 5775 5776 5777 Release 1998b - 1998-01-17 14:31:51 -0500 5778 5779 URL cleanups and additions 5780 5781 5782 Release 1998a - 1998-01-13 12:37:35 -0500 5783 5784 changes by Paul Eggert 5785 5786 5787 Release code1997i-data1997k - 1997-12-29 09:53:41 -0500 5788 5789 changes by Paul Eggert, with minor modifications from Arthur David 5790 Olson to make the files more browser friendly 5791 5792 5793 Release code1997h-data1997j - 1997-12-18 17:47:35 -0500 5794 5795 minor changes to put "TZif" at the start of each timezone information file 5796 5797 a rule has also been added to the Makefile so you can 5798 make zones 5799 to just recompile the zone information files (rather than doing a 5800 full "make install" with its other effects). 5801 5802 5803 Release data1997i - 1997-10-07 08:45:38 -0400 5804 5805 changes to Africa by Paul Eggert 5806 5807 5808 Release code1997g-data1997h - 1997-09-04 16:56:54 -0400 5809 5810 corrections for Uruguay (and other locations) 5811 5812 Arthur David Olson's simple-minded fix allowing mktime to both 5813 correctly handle leap seconds and correctly handle tm_sec values 5814 upon which arithmetic has been performed. 5815 5816 5817 Release code1997f-data1997g - 1997-07-19 13:15:02 -0400 5818 5819 Paul Eggert's updates 5820 5821 a small change to a function prototype; 5822 5823 "Music" has been renamed "Arts.htm", HTMLified, and augmented to 5824 include information on Around the World in Eighty Days. 5825 5826 5827 Release code1997e-data1997f - 1997-05-03 18:52:34 -0400 5828 5829 fixes to zic's error handling 5830 5831 changes inspired by the item circulated on Slovenia 5832 5833 The description of Web resources has been HTMLified for browsing 5834 convenience. 5835 5836 A new piece of tz-related music has been added to the "Music" file. 5837 5838 5839 Release code1997d-data1997e - 1997-03-29 12:48:52 -0500 5840 5841 Paul Eggert's latest suggestions 5842 5843 5844 Release code1997c-data1997d - 1997-03-07 20:37:54 -0500 5845 5846 changes to "zic.c" to correct performance of the "-s" option 5847 5848 a new file "usno1997" 5849 5850 5851 Release data1997c - 1997-03-04 09:58:18 -0500 5852 5853 changes in Israel 5854 5855 5856 Release 1997b - 1997-02-27 18:34:19 -0500 5857 5858 The data file incorporates the 1997 leap second. 5859 5860 The code file incorporates Arthur David Olson's take on the 5861 zic/multiprocessor/directory-creation situation. 5862 5863 5864 Release 1997a - 1997-01-21 09:11:10 -0500 5865 5866 Paul Eggert's Antarctica (and other changes) 5867 5868 Arthur David Olson finessed the "getopt" issue by checking against 5869 both -1 and EOF (regardless of POSIX, SunOS 4.1.1's manual says -1 5870 is returned while SunOS 5.5's manual says EOF is returned). 5871 5872 5873 Release code1996o-data1996n - 1996-12-27 21:42:05 -0500 5874 5875 Paul Eggert's latest changes 5876 5877 5878 Release code1996n - 1996-12-16 09:42:02 -0500 5879 5880 link snapping fix from Bruce Evans (via Garrett Wollman) 5881 5882 5883 Release data1996m - 1996-11-24 02:37:34 -0000 5884 [tzdata1996m.tar.gz is missing!] 5885 5886 Paul Eggert's batch of changes 5887 5888 5889 Release code1996m-data1996l - 1996-11-05 14:00:12 -0500 5890 5891 No functional changes here; the files have simply been changed to 5892 make more use of ISO style dates in comments. The names of the above 5893 files now include the year in full. 5894 5895 5896 Release code96l - 1996-09-08 17:12:20 -0400 5897 5898 tzcode96k was missing a couple of pieces. 5899 5900 5901 Release 96k - 1996-09-08 16:06:22 -0400 5902 5903 the latest round of changes from Paul Eggert 5904 5905 the recent Year 2000 material 5906 5907 5908 Release code96j - 1996-07-30 13:18:53 -0400 5909 5910 Set sp->typecnt as suggested by Timothy Patrick Murphy. 5911 5912 5913 Release code96i - 1996-07-27 20:11:35 -0400 5914 5915 Paul's suggested patch for strftime %V week numbers 5916 5917 5918 Release data96i - 1996-07-01 18:13:04 -0400 5919 5920 "northamerica" and "europe" changes by Paul Eggert 5921 5922 5923 Release code96h - 1996-06-05 08:02:21 -0400 5924 5925 fix for handling transitions specified in Universal Time 5926 5927 Some "public domain" notices have also been added. 5928 5929 5930 Release code96g - 1996-05-16 14:00:26 -0400 5931 5932 fix for the simultaneous-DST-and-zone-change challenge 5933 5934 5935 Release data96h - 1996-05-09 17:40:51 -0400 5936 5937 changes by Paul Eggert 5938 5939 5940 Release code96f-data96g - 1996-05-03 03:09:59 -0000 5941 [tzcode96f.tar.gz + tzdata96g.tar.gz are both missing!] 5942 5943 The changes get us some of the way to fixing the problems noted in Paul 5944 Eggert's letter yesterday (in addition to a few others). The approach 5945 has been to make zic a bit smarter about figuring out what time zone 5946 abbreviations apply just after the time specified in the "UNTIL" part 5947 of a zone line. Putting the smarts in zic means avoiding having 5948 transition times show up in both "Zone" lines and "Rule" lines, which 5949 in turn avoids multiple transition time entries in time zone files. 5950 (This also makes the zic input files such as "europe" a bit shorter and 5951 should ease maintenance.) 5952 5953 5954 Release data96f - 1996-04-19 19:20:03 -0000 5955 [tzdata96f.tar.gz is missing!] 5956 5957 The only changes are to the "northamerica" file; the time zone 5958 abbreviation for Denver is corrected to MST (and MDT), and the 5959 comments for Mexico have been updated. 5960 5961 5962 Release data96e - 1996-03-19 17:37:26 -0500 5963 5964 Proposals by Paul Eggert, in particular the Portugal change that 5965 comes into play at the end of this month. 5966 5967 5968 Release data96d - 1996-03-18 20:49:39 -0500 5969 5970 [not summarized] 5971 5972 5973 Release code96e - 1996-02-29 15:43:27 -0000 5974 [tzcode96e.tar.gz is missing!] 5975 5976 internationalization changes and the fix to the documentation for strftime 5977 5978 5979 Release code96d-data96c - 1996-02-12 11:05:27 -0500 5980 5981 The "code" file simply updates Bob Kridle's electronic address. 5982 5983 The "data" file updates rules for Mexico. 5984 5985 5986 Release data96b - 1996-01-27 15:44:42 -0500 5987 5988 Kiribati change 5989 5990 5991 Release code96c - 1996-01-16 16:58:15 -0500 5992 5993 leap-year streamlining and binary-search changes 5994 5995 fix to newctime.3 5996 5997 5998 Release code96b - 1996-01-10 20:42:39 -0500 5999 6000 fixes and enhancements from Paul Eggert, including code that 6001 emulates the behavior of recent versions of the SunOS "date" 6002 command. 6003 6004 6005 Release 96a - 1996-01-06 09:08:24 -0500 6006 6007 Israel updates 6008 6009 fixes to strftime.c for correct ISO 8601 week number generation, 6010 plus support for two new formats ('G' and 'g') to give ISO 8601 year 6011 numbers (which are not necessarily the same as calendar year numbers) 6012 6013 6014 Release code95i-data95m - 1995-12-21 12:46:47 -0500 6015 6016 The latest revisions from Paul Eggert are included, the usno1995 6017 file has been updated, and a new file ("WWW") covering useful URLs 6018 has been added. 6019 6020 6021 Release code95h-data95l - 1995-12-19 18:10:12 -0500 6022 6023 A simplification of a macro definition, a change to data for Sudan, 6024 and (for last minute shoppers) notes in the "Music" file on the CD 6025 "Old Man Time". 6026 6027 6028 Release code95g-data95k - 1995-10-30 10:32:47 -0500 6029 6030 (slightly reformatted) 8-bit-clean proposed patch 6031 6032 minor patch: US/Eastern -> America/New_York 6033 6034 snapshot of the USNO's latest data ("usno1995") 6035 6036 some other minor cleanups 6037 6038 6039 Release code95f-data95j - 1995-10-28 21:01:34 -0000 6040 [tzcode95f.tar.gz + tzdata95j.tar.gz are both missing!] 6041 6042 European cleanups 6043 6044 support for 64-bit time_t's 6045 6046 optimization in localtime.c 6047 6048 6049 Release code95e - 1995-10-13 13:23:57 -0400 6050 6051 the mktime change to scan from future to past when trying to find time zone 6052 offsets 6053 6054 6055 Release data95i - 1995-09-26 10:43:26 -0400 6056 6057 For Canada/Central, guess that the Sun customer's "one week too 6058 early" was just a approximation, and the true error is one month 6059 too early. This is consistent with the rest of Canada. 6060 6061 6062 Release data95h - 1995-09-21 11:26:48 -0400 6063 6064 latest changes from Paul Eggert 6065 6066 6067 Release code95d - 1995-09-14 11:14:45 -0400 6068 6069 the addition of a "Music" file, which documents four recorded 6070 versions of the tune "Save That Time". 6071 6072 6073 Release data95g - 1995-09-01 17:21:36 -0400 6074 6075 "yearistype" correction 6076 6077 6078 Release data95f - 1995-08-28 20:46:56 -0400 6079 6080 Paul Eggert's change to the australasia file 6081 6082 6083 Release data95e - 1995-07-08 18:02:34 -0400 6084 6085 The only change is a leap second at the end of this year. 6086 Thanks to Bradley White for forwarding news on the leap second. 6087 6088 6089 Release data95d - 1995-07-03 13:26:22 -0400 6090 6091 Paul Eggert's changes 6092 6093 6094 Release data95c - 1995-07-02 19:19:28 -0400 6095 6096 changes to "asia", "backward", "europe", and "southamerica" 6097 (read: northamericacentrics need not apply) 6098 6099 6100 Release code95c - 1995-03-13 14:00:46 -0500 6101 6102 one-line fix for sign extension problems in detzcode 6103 6104 6105 Release 95b - 1995-03-04 11:22:38 -0500 6106 6107 Minor changes in both: 6108 6109 The "code" file contains a workaround for the lack of "unistd.h" in 6110 Microsoft C++ version 7. 6111 6112 The "data" file contains a fixed "Link" for America/Shiprock. 6113 6114 6115 Release 94h - 1994-12-10 12:51:14 -0500 6116 6117 The files: 6118 6119 * incorporate the changes to "zdump" and "date" to make changes to 6120 the "TZ" environment variable permanent; 6121 6122 * incorporate the table changes by Paul Eggert; 6123 6124 * include (and document) support for universal time specifications in 6125 data files - but do not (yet) include use of this feature in the 6126 data files. 6127 6128 Think of this as "TZ Classic" - the software has been set up not to break if 6129 universal time shows up in its input, and data entries have been 6130 left as is so as not to break existing implementations. 6131 6132 6133 Release data94f - 1994-08-20 12:56:09 -0400 6134 6135 (with thanks!) the latest data updates from Paul Eggert 6136 6137 6138 Release data94e - 1994-06-04 13:13:53 -0400 6139 6140 [not summarized] 6141 6142 6143 Release code94g - 1994-05-05 12:14:07 -0400 6144 6145 fix missing "optind.c" and a reference to it in the Makefile 6146 6147 6148 Release code94f - 1994-05-05 13:00:33 -0000 6149 [tzcode94f.tar.gz is missing!] 6150 6151 changes to avoid overflow in difftime, as well as changes to cope 6152 with the 52/53 challenge in strftime 6153 6154 6155 Release code94e - 1994-03-30 23:32:59 -0500 6156 6157 change for the benefit of PCTS 6158 6159 6160 Release 94d - 1994-02-24 15:42:25 -0500 6161 6162 Avoid clashes with POSIX semantics for zones such as GMT+4. 6163 6164 Some other very minor housekeeping is also present. 6165 6166 6167 Release code94c - 1994-02-10 08:52:40 -0500 6168 6169 Fix bug where mkdirs was broken unless you compile with 6170 -fwritable-strings (which is generally losing to do). 6171 6172 6173 Release 94b - 1994-02-07 10:04:33 -0500 6174 6175 work by Paul Eggert who notes: 6176 6177 I found another book of time zone histories by E W Whitman; it's not 6178 as extensive as Shanks but has a few goodies of its own. I used it 6179 to update the tables. I also fixed some more as a result of 6180 correspondence with Adam David and Peter Ilieve, and move some stray 6181 links from 'europe' to 'backward'. I corrected some scanning errors 6182 in usno1989. 6183 6184 As far as the code goes, I fixed zic to allow years in the range 6185 INT_MIN to INT_MAX; this fixed a few boundary conditions around 1900. 6186 And I cleaned up the zic documentation a little bit. 6187 6188 6189 Release data94a - 1994-02-03 08:58:54 -0500 6190 6191 It simply incorporates the recently announced leap second into the 6192 "leapseconds" file. 6193 6194 6195 Release 93g - 1993-11-22 17:28:27 -0500 6196 6197 Paul Eggert has provided a good deal of historic information (based 6198 on Shanks), and there are some code changes to deal with the buglets 6199 that crawled out in dealing with the new information. 6200 6201 6202 Release 93f - 1993-10-15 12:27:46 -0400 6203 6204 Paul Eggert's changes 6205 6206 6207 Release 93e - 1993-09-05 21:21:44 -0400 6208 6209 This has updated data for Israel, England, and Kwajalein. There's 6210 also an update to "zdump" to cope with Kwajalein's 24-hour jump. 6211 Thanks to Paul Eggert and Peter Ilieve for the changes. 6212 6213 6214 Release 93d - 1993-06-17 23:34:17 -0400 6215 6216 new fix and new data on Israel 6217 6218 6219 Release 93c - 1993-06-06 19:31:55 -0400 6220 6221 [not summarized] 6222 6223 6224 Release 93b - 1993-02-02 14:53:58 -0500 6225 6226 updated "leapseconds" file 6227 6228 6229 Release 93 - 1993-01-08 07:01:06 -0500 6230 6231 At kre's suggestion, the package has been split in two - a code piece 6232 (which also includes documentation) that's only of use to folks who 6233 want to recompile things and a data piece useful to anyone who can 6234 run "zic". 6235 6236 The new version has a few changes to the data files, a few 6237 portability changes, and an off-by-one fix (with thanks to 6238 Tom Karzes at deshaw.com for providing a description and a 6239 solution). 6240 6241 6242 Release 92c - 1992-11-21 17:35:36 -0000 6243 [tz92c.tar.Z is missing!] 6244 6245 The fallout from the latest round of DST transitions. 6246 6247 There are changes for Portugal, Saskatchewan, and "Pacific-New"; 6248 there's also a change to "zic.c" that makes it portable to more systems. 6249 6250 6251 Release 92 - 1992-04-25 18:17:03 -0000 6252 [tz92.tar.Z is missing!] 6253 6254 By popular demand (well, at any rate, following a request by kre at munnari) 6255 6256 6257 The 1989 update of the time zone package featured: 6258 6259 * POSIXization (including interpretation of POSIX-style TZ environment 6260 variables, provided by Guy Harris), 6261 * ANSIfication (including versions of "mktime" and "difftime"), 6262 * SVIDulation (an "altzone" variable) 6263 * MACHination (the "gtime" function) 6264 * corrections to some time zone data (including corrections to the rules 6265 for Great Britain and New Zealand) 6266 * reference data from the United States Naval Observatory for folks who 6267 want to do additional time zones 6268 * and the 1989 data for Saudi Arabia. 6269 6270 (Since this code will be treated as "part of the implementation" in some 6271 places and as "part of the application" in others, there's no good way to 6272 name functions, such as timegm, that are not part of the proposed ANSI C 6273 standard; such functions have kept their old, underscore-free names in this 6274 update.) 6275 6276 And the "dysize" function has disappeared; it was present to allow 6277 compilation of the "date" command on old BSD systems, and a version of "date" 6278 is now provided in the package. The "date" command is not created when you 6279 "make all" since it may lack options provided by the version distributed with 6280 your operating system, or may not interact with the system in the same way 6281 the native version does. 6282 6283 Since POSIX frowns on correct leap second handling, the default behavior of 6284 the "zic" command (in the absence of a "-L" option) has been changed to omit 6285 leap second information from its output files. 6286 6287 6288 ----- 6289 Notes 6290 6291 This file contains copies of the part of each release announcement 6292 that talks about the changes in that release. The text has been 6293 adapted and reformatted for the purposes of this file. 6294 6295 Traditionally a release R consists of a pair of tarball files, 6296 tzcodeR.tar.gz and tzdataR.tar.gz. However, some releases (e.g., 6297 code2010a, data2012c) consist of just one or the other tarball, and a 6298 few (e.g., code2012c-data2012d) have tarballs with mixed version 6299 numbers. Recent releases also come in an experimental format 6300 consisting of a single tarball tzdb-R.tar.lz with extra data. 6301 6302 Release timestamps are taken from the release's commit (for newer, 6303 Git-based releases), from the newest file in the tarball (for older 6304 releases, where this info is available) or from the email announcing 6305 the release (if all else fails; these are marked with a time zone 6306 abbreviation of -0000 and an "is missing!" comment). 6307 6308 Earlier versions of the code and data were not announced on the tz 6309 list and are not summarized here. 6310 6311 This file is in the public domain. 6312 6313 Local Variables: 6314 coding: utf-8 6315 End: 6316
Indexes created Mon Sep 29 03:10:08 GMT 2025