April 2019 - tz - lists.iana.org

proposed time zone package changes (Samoa, Factory, et al.)
by Arthur David Olson 28 Aug '19

28 Aug '19

Below find proposed time zone package changes; the executive summary: * Makefile Change LOCALTIME default from "Factory" to "GMT"; do not compile "factory" file (but keep it in the distribution). * Theory Remove reference to "Factory" zone. * australasia Change end of DST in Samoa in 2011 from 2011-04-03 0:00 to 2011-04-03 1:00 (thanks to Raymond Hughes for a reference). * localtime.c Initialize ttinfo structures filled by tzparse (thanks to Ravindra for reporting a valgrind warning). * zic.c Fix generation of POSIX strings for zones with rules using "weekday<=n" forms of dates (thanks to Lei Liu for finding the problem). Also, limit output for non-POSIX-specificable zones defined to follow the same rules every year. (Note that no zones of either of the above types appear in the distribution; these changes cater to add-on zones). If no problems are found, 2010n will appear on 2010-10-25. --ado diff -r -c old/Makefile new/Makefile *** old/Makefile Mon Sep 27 09:24:25 2010 --- new/Makefile Tue Oct 12 12:36:50 2010 *************** *** 1,5 **** # <pre> ! # @(#)Makefile 8.8 # This file is in the public domain, so clarified as of # 2009-05-17 by Arthur David Olson. --- 1,5 ---- # <pre> ! # @(#)Makefile 8.9 # This file is in the public domain, so clarified as of # 2009-05-17 by Arthur David Olson. *************** *** 12,18 **** # make zonenames # to get a list of the values you can use for LOCALTIME. ! LOCALTIME= Factory # If you want something other than Eastern United States time as a template # for handling POSIX-style time zone environment variables, --- 12,18 ---- # make zonenames # to get a list of the values you can use for LOCALTIME. ! LOCALTIME= GMT # If you want something other than Eastern United States time as a template # for handling POSIX-style time zone environment variables, *************** *** 262,269 **** DOCS= README Theory $(MANS) date.1 Makefile PRIMARY_YDATA= africa antarctica asia australasia \ europe northamerica southamerica ! YDATA= $(PRIMARY_YDATA) pacificnew etcetera factory backward ! NDATA= systemv SDATA= solar87 solar88 solar89 TDATA= $(YDATA) $(NDATA) $(SDATA) TABDATA= iso3166.tab zone.tab --- 262,269 ---- DOCS= README Theory $(MANS) date.1 Makefile PRIMARY_YDATA= africa antarctica asia australasia \ europe northamerica southamerica ! YDATA= $(PRIMARY_YDATA) pacificnew etcetera backward ! NDATA= systemv factory SDATA= solar87 solar88 solar89 TDATA= $(YDATA) $(NDATA) $(SDATA) TABDATA= iso3166.tab zone.tab diff -r -c old/Theory new/Theory *** old/Theory Mon Sep 27 09:24:25 2010 --- new/Theory Tue Oct 12 12:36:50 2010 *************** *** 1,4 **** ! @(#)Theory 8.4 This file is in the public domain, so clarified as of 2009-05-17 by Arthur David Olson. --- 1,4 ---- ! @(#)Theory 8.5 This file is in the public domain, so clarified as of 2009-05-17 by Arthur David Olson. *************** *** 287,294 **** See the file `backward' for most of these older names (e.g. `US/Eastern' instead of `America/New_York'). The other old-fashioned names still supported are ! `WET', `CET', `MET', `EET' (see the file `europe'), ! and `Factory' (see the file `factory'). ----- Time zone abbreviations ----- --- 287,293 ---- See the file `backward' for most of these older names (e.g. `US/Eastern' instead of `America/New_York'). The other old-fashioned names still supported are ! `WET', `CET', `MET', and `EET' (see the file `europe'). ----- Time zone abbreviations ----- diff -r -c old/australasia new/australasia *** old/australasia Mon Sep 27 09:24:27 2010 --- new/australasia Tue Oct 12 13:14:56 2010 *************** *** 1,5 **** # <pre> ! # @(#)australasia 8.18 # This file is in the public domain, so clarified as of # 2009-05-17 by Arthur David Olson. --- 1,5 ---- # <pre> ! # @(#)australasia 8.19 # This file is in the public domain, so clarified as of # 2009-05-17 by Arthur David Olson. *************** *** 487,497 **** # http://www.parliament.gov.ws/documents/acts/Daylight%20Saving%20Act%20%2020… # </a> Zone Pacific/Apia 12:33:04 - LMT 1879 Jul 5 -11:26:56 - LMT 1911 -11:30 - SAMT 1950 # Samoa Time -11:00 - WST 2010 Sep 26 ! -11:00 1:00 WSDT 2011 Apr 3 -11:00 - WST # Solomon Is --- 487,507 ---- # http://www.parliament.gov.ws/documents/acts/Daylight%20Saving%20Act%20%2020… # </a> + # From Raymond Hughes (2010-10-07): + # Please see + # <a href="http://www.mcil.gov.ws"> + # http://www.mcil.gov.ws + # </a>, + # the Ministry of Commerce, Industry and Labour (sideframe) "Last Sunday + # September 2010 (26/09/10) - adjust clocks forward from 12:00 midnight + # to 01:00am and First Sunday April 2011 (03/04/11) - adjust clocks + # backwards from 1:00am to 12:00am" + Zone Pacific/Apia 12:33:04 - LMT 1879 Jul 5 -11:26:56 - LMT 1911 -11:30 - SAMT 1950 # Samoa Time -11:00 - WST 2010 Sep 26 ! -11:00 1:00 WSDT 2011 Apr 3 1:00 -11:00 - WST # Solomon Is diff -r -c old/localtime.c new/localtime.c *** old/localtime.c Mon Sep 27 09:24:26 2010 --- new/localtime.c Tue Oct 12 12:36:51 2010 *************** *** 5,11 **** #ifndef lint #ifndef NOID ! static char elsieid[] = "@(#)localtime.c 8.14"; #endif /* !defined NOID */ #endif /* !defined lint */ --- 5,11 ---- #ifndef lint #ifndef NOID ! static char elsieid[] = "@(#)localtime.c 8.15"; #endif /* !defined NOID */ #endif /* !defined lint */ *************** *** 914,919 **** --- 914,920 ---- register unsigned char * typep; register char * cp; register int load_result; + static struct ttinfo zttinfo; INITIALIZE(dstname); stdname = name; *************** *** 986,991 **** --- 987,993 ---- /* ** Two transitions per year, from EPOCH_YEAR forward. */ + sp->ttis[0] = sp->ttis[1] = zttinfo; sp->ttis[0].tt_gmtoff = -dstoffset; sp->ttis[0].tt_isdst = 1; sp->ttis[0].tt_abbrind = stdlen + 1; *************** *** 1099,1106 **** } /* ** Finally, fill in ttis. - ** ttisstd and ttisgmt need not be handled. */ sp->ttis[0].tt_gmtoff = -stdoffset; sp->ttis[0].tt_isdst = FALSE; sp->ttis[0].tt_abbrind = 0; --- 1101,1108 ---- } /* ** Finally, fill in ttis. */ + sp->ttis[0] = sp->ttis[1] = zttinfo; sp->ttis[0].tt_gmtoff = -stdoffset; sp->ttis[0].tt_isdst = FALSE; sp->ttis[0].tt_abbrind = 0; *************** *** 1113,1118 **** --- 1115,1121 ---- dstlen = 0; sp->typecnt = 1; /* only standard time */ sp->timecnt = 0; + sp->ttis[0] = zttinfo; sp->ttis[0].tt_gmtoff = -stdoffset; sp->ttis[0].tt_isdst = 0; sp->ttis[0].tt_abbrind = 0; diff -r -c old/zic.c new/zic.c *** old/zic.c Mon Sep 27 09:24:26 2010 --- new/zic.c Tue Oct 12 13:37:29 2010 *************** *** 3,9 **** ** 2006-07-17 by Arthur David Olson. */ ! static char elsieid[] = "@(#)zic.c 8.22"; #include "private.h" #include "locale.h" --- 3,9 ---- ** 2006-07-17 by Arthur David Olson. */ ! static char elsieid[] = "@(#)zic.c 8.24"; #include "private.h" #include "locale.h" *************** *** 1881,1896 **** register int week; if (rp->r_dycode == DC_DOWGEQ) { ! week = 1 + rp->r_dayofmonth / DAYSPERWEEK; ! if ((week - 1) * DAYSPERWEEK + 1 != rp->r_dayofmonth) return -1; } else if (rp->r_dycode == DC_DOWLEQ) { if (rp->r_dayofmonth == len_months[1][rp->r_month]) week = 5; else { ! week = 1 + rp->r_dayofmonth / DAYSPERWEEK; ! if (week * DAYSPERWEEK - 1 != rp->r_dayofmonth) return -1; } } else return -1; /* "cannot happen" */ (void) sprintf(result, "M%d.%d.%d", --- 1881,1896 ---- register int week; if (rp->r_dycode == DC_DOWGEQ) { ! if ((rp->r_dayofmonth % DAYSPERWEEK) != 1) return -1; + week = 1 + rp->r_dayofmonth / DAYSPERWEEK; } else if (rp->r_dycode == DC_DOWLEQ) { if (rp->r_dayofmonth == len_months[1][rp->r_month]) week = 5; else { ! if ((rp->r_dayofmonth % DAYSPERWEEK) != 0) return -1; + week = rp->r_dayofmonth / DAYSPERWEEK; } } else return -1; /* "cannot happen" */ (void) sprintf(result, "M%d.%d.%d", *************** *** 2018,2023 **** --- 2018,2024 ---- register char * envvar; register int max_abbr_len; register int max_envvar_len; + register int prodstic; /* all rules are min to max */ max_abbr_len = 2 + max_format_len + max_abbrvar_len; max_envvar_len = 2 * max_abbr_len + 5 * 9; *************** *** 2032,2037 **** --- 2033,2039 ---- timecnt = 0; typecnt = 0; charcnt = 0; + prodstic = zonecount == 1; /* ** Thanks to Earl Chew ** for noting the need to unconditionally initialize startttisstd. *************** *** 2053,2058 **** --- 2055,2062 ---- updateminmax(rp->r_loyear); if (rp->r_hiwasnum) updateminmax(rp->r_hiyear); + if (rp->r_lowasnum || rp->r_hiwasnum) + prodstic = FALSE; } } /* *************** *** 2075,2080 **** --- 2079,2094 ---- if (max_year <= INT_MAX - YEARSPERREPEAT) max_year += YEARSPERREPEAT; else max_year = INT_MAX; + /* + ** Regardless of any of the above, + ** for a "proDSTic" zone which specifies that its rules + ** always have and always will be in effect, + ** we only need one cycle to define the zone. + */ + if (prodstic) { + min_year = 1900; + max_year = min_year + YEARSPERREPEAT; + } } /* ** For the benefit of older systems,

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Hong Kong Time history
by P Chan 31 May '19

31 May '19

*According to the Hong Kong Daylight-Saving Regulations, 1941, the 1941 spring-forward transition was at 03:00. http://sunzi.lib.hku.hk/hkgro/view/g1941/304271.pdf http://sunzi.lib.hku.hk/hkgro/view/g1941/305516.pdf *According to some articles from South China Morning Post, +08 was resumed on 1945-11-18 at 02:00. https://i.imgur.com/M2IsZ3c.png https://i.imgur.com/iOPqrVo.png https://i.imgur.com/fffcGDs.png *Some newspapers published on said the 1946 spring-forward transition was on 04-21 at 00:00. The Kung Sheung Evening News 1946-04-20 (Chinese) https://i.imgur.com/ZSzent0.png https://mmis.hkpl.gov.hk///c/portal/cover?c=QF757YsWv5%2FH7zGe%2FKF%2BFLYsu… p.4 The Kung Sheung Daily News 1946-04-21 (Chinese) https://i.imgur.com/7ecmRlcm.png https://mmis.hkpl.gov.hk///c/portal/cover?c=QF757YsWv5%2BQBGt1%2BwUj5qG2Gqt… p.4 *According to the Summer Time Ordinance (1946), the fallback transitions between 1946 and 1952 were at 03:30 Standard Time (+08) http://oelawhk.lib.hku.hk/archive/files/bb74b06a74d5294620a15de560ab33c6.pdf *Some other laws and regulations related to DST from 1953 to 1979 Summer Time Ordinance 1953 https://i.imgur.com/IOlJMav.jpg Summer Time (Amendment) Ordinance 1965 https://i.imgur.com/8rofeLa.jpg Interpretation and General Clauses Ordinance (1966) https://i.imgur.com/joy3msj.jpg Emergency (Summer Time) Regulation 1973 https://i.imgur.com/OpRWrKz.jpg Interpretation and General Clauses (Amendment) Ordinance 1977 https://i.imgur.com/RaNqnc4.jpg Resolution of the Legislative Council passed on 9 May 1979 https://www.legco.gov.hk/yr78-79/english/lc_sitg/hansard/h790509.pdf#page=39 P Chan

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Fwd: Historical timezone data for Bonin Islands (Ogasawara)
by Phake Nick 29 May '19

29 May '19

Hello all, I have recently received some new information about timezone history of Bonin Islands, Japan as detailed in the attached message. Because their last time change to return to Japanese time when they return to Japanese rule was right before 1970, it mean per the current tz database rule, the information doesn't warrant creation of a new timezone for Bonin Islands itself and is thus as an anecdotal note for interest purpose only. However, in the attached link, it described some special timekeeping phenomenon regarding Marcus island, another remote island currently owned by Japanese in the same administrative unit as Bonin Islands. Many reports claim that the American coastal guard on the American quarter of the island use its own coastal guard time, and most sources describe the time as UTC+11, being two hours faster than JST used by some Japanese personnel on the island. Some sites describe it as same as Wake Island/Guam time although it would be incorrect to be same as Guam. And then in a few Japanese governmental report from 1980s (from National Institute of Information and Communications Technology) regarding the construction of VLBI facility on the Marcus Island, it claimed that there're three time standard being used on the island at the time which include not just JST (UTC+9) or [US]CG time (UTC+11) but also a JMSDF time (UTC+10) (Japan Maritime Self-Defense Force). Unfortunately there are no other sources that mentioned such time and there are also no information on things like how the tine was used. ---------- Forwarded message --------- From: Wakaba Date: 2019-1-28 Mon 13:48 Subject: Re: Question related to the page 昭和のサマータイム on suikawiki To: Phake Nick >> Hello, I see that there're a lot of information about DST at the time in Japan on Suikawiki, but a special area that's not mentioned in the page os Ogasawara 小笠原諸島 (Bonin Islands) which seems to have its own different history of governance. Do you know where can information related to timezone of the islands can be found? > Unfortunately we have no reliable source on time in US-controlled Ogasawara Islands at the moment. It turns out that National Diet Library of Japan has several reports by Japanese Government officers that describe the time used in islands when they visited there. According to them (and other sources such as newspapers), standard time UTC + 10 (JST + 1) and DST UTC + 11 (JST + 2) was used until its return to Japan at 1968-06-26 00:00 JST. The exact periods of DST are still unknown. I guessed Guam, Mariana, and Bonin and Marcus districts might have synchronized their DST periods, but reports imply they had their own decisions, i.e. there were three or more different time zones. Details: https://wiki.suikawiki.org/n/%E5%B0%8F%E7%AC%A0%E5%8E%9F%E8%AB%B8%E5%B3%B6%…

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Decree for Chile DST change
by Juan Correa 17 May '19

17 May '19

I couldn't find the decree for the chilean DST change until today (even when it was published on November 23th on the Official Gazette, I searched for it on december 2018 with no avail) http://www.diariooficial.interior.gob.cl/publicaciones/2018/11/23/42212/01/… The only extra bit of information is that America/Punta_Arenas is confirmed to not change until 2022 -- Juan Correa Poblete PS Labs (http://www.pslabs.cl)

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Some extra information about the Eucla zone
by Gilmore Davidson 17 May '19

17 May '19

After Australia’s clock change last weekend, the national broadcaster has published an article about the Eucla time zone: https://www.abc.net.au/news/2019-04-08/this-remote-stretch-of-desert-has-it… <https://www.abc.net.au/news/2019-04-08/this-remote-stretch-of-desert-has-it…> > Sergeant Chamberlain said when it comes to life on the Nullarbor, the custom made time zone was at the lower end of quirky. Some interesting snippets of information include a rough description of the geographical boundaries... > The time zone exists for about 340 kilometres and takes in the tiny roadhouse communities of Cocklebiddy, Madura, Madura, Eucla and Border Village. …and an indication that the zone has definitely been in existence since before the 1970 cut-off of the database: > Mr Pike has lived on the Nullarbor for 47 years > > […] > > 'Why'? > > "Good question," Mr Pike said. > > "I don't even know that, and it's been going for over 50 years.” This doesn’t change any of the existing data, but could be useful as a reference. Cheers, Gil

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Big tech warns of 'Japan's millennium bug' ahead of Akihito's abdication
by Martin Burnicki 30 Apr '19

30 Apr '19

Don't know if this has already been known, or if it's really relevant for this list, but ... "Big tech warns of 'Japan's millennium bug' ahead of Akihito's abdication" https://www.theguardian.com/technology/2018/jul/25/big-tech-warns-japan-mil… Martin -- Martin Burnicki Senior Software Engineer MEINBERG Funkuhren GmbH & Co. KG Email: martin.burnicki(a)meinberg.de Phone: +49 5281 9309-414 Linkedin: https://www.linkedin.com/in/martinburnicki/ Lange Wand 9, 31812 Bad Pyrmont, Germany Amtsgericht Hannover 17HRA 100322 Geschäftsführer/Managing Directors: Günter Meinberg, Werner Meinberg, Andre Hartmann, Heiko Gerstung Websites: https://www.meinberg.de https://www.meinbergglobal.com Training: https://www.meinberg.academy

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Brazil no longer has DST changes - decreet signed today
by Marcus Diniz 28 Apr '19

28 Apr '19

Hello Paul, TZ team, Brazil no longer has DST changes - decreet signed today https://g1.globo.com/politica/noticia/2019/04/25/bolsonaro-assina-decreto-q… https://economia.ig.com.br/2019-04-25/bolsonaro-assina-nesta-quinta-feira-d… Can you please update the southamerica timezone file? Marcus Diniz

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Brazilian state of Goiás may abolish DST
by World Time Zone 27 Apr '19

27 Apr '19

According to some news Brazilian state of Goiás may abolish DST: "The Energy and Mines Commission of the House of Representatives approved a Legislative Decree that suspends daylight saving time in Goiás." http://www.infomoney.com.br/minhas-financas/consumo/noticia/7061178/comissa… Also, ".... this year the federal government even considered not implementing daylight saving time, but left the decision to 2018." Alexander Krivenyshev https://www.WorldTimeZone.com

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[PATCH] * northamerica: Comment re Regina 1914-1917.
by Paul Eggert 26 Apr '19

26 Apr '19

--- northamerica | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/northamerica b/northamerica index eee8de0..8e5e351 100644 --- a/northamerica +++ b/northamerica @@ -1843,6 +1843,13 @@ Zone America/Winnipeg -6:28:36 - LMT 1887 Jul 16 # Willett (1914-03) notes that DST "has been in operation ... in the # City of Moose Jaw, Saskatchewan, for one year." +# From Paul Eggert (2019-04-26): +# Chris Pearce's book "The Great Daylight Saving Time Controversy" (2017) +# says that Regina observed DST in 1914-1917. No dates and times, +# unfortunately. It also says that in 1914 Saskatoon observed DST +# from 1 June to 6 July, and that DST was also tried out in Davidson, +# Melfort, and Prince Albert. + # From Paul Eggert (2006-03-22): # Shanks & Pottenger say that since 1970 this region has mostly been as Regina. # Some western towns (e.g. Swift Current) switched from MST/MDT to CST in 1972. -- 2.20.1

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Brazil: DST cancelled in Brazil
by Clésio Takahashi 26 Apr '19

26 Apr '19

Hello, >From now on, DST in Brazil will not be applied anymore. This is the decree making it official, signed by the President yesterday: http://www.planalto.gov.br/ccivil_03/_Ato2019-2022/2019/Decreto/D9772.htm Best regards, Clésio Takahashi Technical Account Manager Red Hat Brasil, SCE LATAM clesio(a)redhat.com M: +55 11 9 9137 7013 Partnering with you to help achieve your business goals: https://www.redhat.com/en/services

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