August 2017 - tz - lists.iana.org

proposed time zone package changes (Samoa, Factory, et al.)
by Arthur David Olson Aug. 28, 2019

Aug. 28, 2019

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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Turks & Caicos to resume DST; details unclear
by Paul Eggert Oct. 31, 2017

Oct. 31, 2017

According to an article published in the Bahamas website Magnetic Media, the cabinet of Turks & Caicos decided on Thursday to resume the practice of daylight saving time starting in 2018. The article does not give enough details to update the database (it confuses summer with winter time, among other things). My guess is that Turks & Caicos will revert to its pre-2015 practice of staying in sync with New York, which means that tzdb's predictions for its UTC offsets will become wrong in November 2018, and the abbreviations and tm_isdst flag will become wrong some time between March and November 2018 (although the article implies April, this could well be an error). When the cabinet and/or the Turks & Caicos Weekly News get around to publishing the details of the decision, we should be able to update tzdb to reflect this change with some accuracy. Gordon Z. PDM to reinstate Daylight Savings Time. Magnetic Media 2017-07-20. http://magneticmediatv.com/2017/07/pdm-to-reinstate-daylight-savings-time/ ("PDM" is the People's Democratic Movement.)

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Alberta Tory leadership candidate petitions to drop DST and move to CT
by Brian Inglis Sept. 19, 2017

Sept. 19, 2017

On the final day of the fall sitting on Tuesday, Alberta Progressive Conservative leadership candidate, Vermilion-Lloydminster MLA Richard Starke presented a petition to the legislature calling for repeal of the Daylight Saving Time Act and a move to Central Time (from Mountain Time), to be decided by a referendum. The stories linked below are all from the same news org and under the same byline. The latter two have a vote button at the bottom to poll readers' opinions, each currently running about 80/20 in favour of dropping DST, and/or possibly also of switching to permanent CT, depending on whether the voters read the question or just clicked. http://calgaryherald.com/news/politics/pc-leadership-candidate-starke-calls… http://www.edmontonjournal.com/news/politics/leadership+candidate+starke+ca… http://www.calgarysun.com/2016/12/14/to-keep-or-ditch-daylight-saving-time-… http://www.edmontonsun.com/2016/12/14/to-keep-or-ditch-daylight-saving-time… -- Take care. Thanks, Brian Inglis, Calgary, Alberta, Canada

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Time zones in xkcd #1883
by Tim Parenti Aug. 30, 2017

Aug. 30, 2017

Today's xkcd by Randall Munroe (2017-08-30) shows how time zones can throw a wrench into supervillians' plans: https://www.xkcd.com/1883/ -- Tim Parenti

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Fiji DST change?
by Magnus Bengtsson Aug. 28, 2017

Aug. 28, 2017

IATA has sent out the following message: " Please be advised of the following 2017/18 DST dates for Fiji. Please amend the entry for Fiji in Appendix F of your SSIM MAR17 issue to reflect the following: Country Time Standard - - - DST Start - - - - - - DST End - - - DST Name Zone Variation Time Date Time Date Variation Fiji FJ +1200 1400 04NOV17 1400 13JAN18 +1300 " The end date (13JAN18) does not seem to conform to the current rule in tzdata2017b. I can't find any information about this on http://www.fiji.gov.fj Does anyone have any more information? /Magnus Bengtsson

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[PROPOSED] Adjust official transition for Turks & Caicos
by Paul Eggert Aug. 26, 2017

Aug. 26, 2017

* NEWS: Adjust. * northamerica (America/Grand_Turk): Switch 2018-03-11 03:00, not 2018-04-01. --- NEWS | 2 +- northamerica | 8 +++++++- 2 files changed, 8 insertions(+), 2 deletions(-) diff --git a/NEWS b/NEWS index 0909112..55c06f7 100644 --- a/NEWS +++ b/NEWS @@ -19,7 +19,7 @@ Unreleased, experimental changes at 02:00. (Thanks to Steffen Thorsen.) Turks & Caicos will switch from -04 all year to -05 with US DST on - 2018-04-01 at 00:00. This affects UT offsets starting 2018-11-04 + 2018-03-11 at 03:00. This affects UT offsets starting 2018-11-04 at 02:00. (Thanks to Steffen Thorsen.) Changes to past time stamps diff --git a/northamerica b/northamerica index 42529de..93655fa 100644 --- a/northamerica +++ b/northamerica @@ -3390,12 +3390,18 @@ Zone America/Miquelon -3:44:40 - LMT 1911 May 15 # St Pierre # Time, during the winter months with effect from April 2018 ... # https://www.gov.uk/government/news/turks-and-caicos-post-cabinet-meeting-st… # +# From Paul Eggert (2018-08-26): +# The date of effect of the spring 2018 change appears to be March 11, +# which makes more sense. See: Hamilton D. Time change back +# by March 2018 for TCI. Magnetic Media. 2018-08-25. +# http://magneticmediatv.com/2017/08/time-change-back-by-march-2018-for-tci/ +# # Zone NAME GMTOFF RULES FORMAT [UNTIL] Zone America/Grand_Turk -4:44:32 - LMT 1890 -5:07:11 - KMT 1912 Feb # Kingston Mean Time -5:00 - EST 1979 -5:00 US E%sT 2015 Nov Sun>=1 2:00 - -4:00 - AST 2018 Apr + -4:00 - AST 2018 Mar 11 3:00 -5:00 US E%sT # British Virgin Is -- 2.7.4

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[PATCH] * tz-art.htm (Jokes): Add Keillor joke on tz security.
by Paul Eggert Aug. 25, 2017

Aug. 25, 2017

--- tz-art.htm | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/tz-art.htm b/tz-art.htm index abe8eb3..a42361f 100644 --- a/tz-art.htm +++ b/tz-art.htm @@ -549,6 +549,14 @@ yesterday daylight [saving] time ended. Right now it's basically midnight." (Conan O'Brien on the 2010-11-08 premiere of <em>Conan</em>.) </li> <li> +"And now, driving to California, I find that I must enter a password +in order to change the time zone on my laptop clock. Evidently, +someone is out to mess up my schedule and my clock must be secured." +(Garrison Keillor, +"<a href="http://www.garrisonkeillor.com/weve-never-been-here-before/">We've +never been here before</a>", 2017-08-22) +</li> +<li> "Well, in my time zone that's all the time I have, but maybe in your time zone I haven't finished yet. So stay tuned!" (Goldie Hawn, <em>Rowan & Martin's Laugh-In</em> No. 65, 1970-03-09) -- 2.7.4

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Fixed typos
by Dominique Pellé Aug. 21, 2017

Aug. 21, 2017

Hi Following patch fixes various typos: diff --git a/asia b/asia index e26ef1b..7518e0c 100644 --- a/asia +++ b/asia @@ -900,7 +900,7 @@ Zone Asia/Dili 8:22:20 - LMT 1912 Jan 1 # From Paul Eggert (2017-04-20): # Good luck trying to nail down old timekeeping records in India. # "... in the nineteenth century ... Madras Observatory took its magnetic -# measurements in Göttingen time, its meterological measurements on Madras +# measurements in Göttingen time, its metrological measurements on Madras # (local) time, dropped its time ball on Greenwich (ocean navigator's) time, # and distributed civil (local time)." -- Bartky IR. Selling the time: # 19th-century timekeeping in america. Stanford U Press (2000), 247 note 19. @@ -917,7 +917,7 @@ Zone Asia/Dili 8:22:20 - LMT 1912 Jan 1 # # "In 1870 ... Madras time - 'now used by the telegraph and regulated from the # only government observatory' - was suggested as a standard railway time, -# first to be dopted on the Great Indian Peninsular Railway (GIPR).... +# first to be adopted on the Great Indian Peninsular Railway (GIPR).... # Calcutta, Bombay, and Karachi, were to be allowed to continue with their # local time for civil purposes." - Prasad R. Tracks of Change: Railways and # Everyday Life in Colonial India. Cambridge University Press (2016), 145. diff --git a/australasia b/australasia index 6bf0f0a..1e38db7 100644 --- a/australasia +++ b/australasia @@ -1306,7 +1306,7 @@ Zone Pacific/Wallis 12:15:20 - LMT 1901 # http://abc.net.au/news/regionals/neweng/monthly/regeng-22jul1999-1.htm # (1999-07-22). For now, we'll wait to see if this really happens. # -# Victoria will following NSW. See: +# Victoria will follow NSW. See: # Vic to extend daylight saving (1999-07-28) # http://abc.net.au/local/news/olympics/1999/07/item19990728112314_1.htm # diff --git a/backzone b/backzone index 69f6a95..255c4a6 100644 --- a/backzone +++ b/backzone @@ -559,7 +559,7 @@ Zone Europe/Guernsey -0:10:09 - LMT 1913 Jun 18 # Time Act in 1883 and including additional confirmation of some of # the dates of the 'Summer Time' orders originating at # Westminster. There is a little uncertainty as to the starting date -# of the first summer time in 1916 which may have be announced a +# of the first summer time in 1916 which may have been announced a # couple of days late. There is still a substantial number of # documents to work through, but it is thought that every GB change # was also implemented on the island. diff --git a/europe b/europe index 0620db6..8cc55e8 100644 --- a/europe +++ b/europe @@ -2303,7 +2303,7 @@ Zone Europe/Bucharest 1:44:24 - LMT 1891 Oct # http://itar-tass.com/obschestvo/1333711 # http://www.pravo.gov.ru:8080/page.aspx?111660 # http://www.kremlin.ru/acts/46279 -# From October 26, 2014 the new Russian time zone map will looks like this: +# From October 26, 2014 the new Russian time zone map will look like this: # http://www.worldtimezone.com/dst_news/dst_news_russia-map-2014-07.html # From Paul Eggert (2006-03-22): diff --git a/southamerica b/southamerica index 6038c3b..a07da71 100644 --- a/southamerica +++ b/southamerica @@ -1076,7 +1076,7 @@ Zone America/Rio_Branco -4:31:12 - LMT 1914 # the following source, cited by Oscar van Vlijmen (2006-10-08): # [1] Chile Law # http://www.webexhibits.org/daylightsaving/chile.html -# This contains a copy of a this official table: +# This contains a copy of this official table: # Cambios en la hora oficial de Chile desde 1900 (retrieved 2008-03-30) # http://web.archive.org/web/20080330200901/http://www.horaoficial.cl/cambio.… # [1] needs several corrections, though.

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Fiji DST change
by Dominic Fok Aug. 21, 2017

Aug. 21, 2017

Hi all, Here is a daylight saving order for Fiji DST in 2018 to finish on the 14th, rather than the 21st (local time). I believe IATA have also sent out a similar memo. Could tzdatabase be updated please? Thanks, D Good planets are hard to find - please think of the environment before you print this email. ____________________________________________________________________ CAUTION - This message may contain privileged and confidential information intended only for the use of the addressee named above. If you are not the intended recipient of this message you are hereby notified that any use, dissemination, distribution or reproduction of this message is prohibited. If you have received this message in error please notify Air New Zealand immediately. Any views expressed in this message are those of the individual sender and may not necessarily reflect the views of Air New Zealand. _____________________________________________________________________ For more information on the Air New Zealand Group, visit us online at http://www.airnewzealand.com _____________________________________________________________________

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Madras Observatory reports [RE: Fixed typos]
by Gent, R.H. van (Rob) Aug. 20, 2017

Aug. 20, 2017

In the 19th century it was quite common for an astronomical observatory to also make meteorological and magnetic observations. https://archive.org/details/meteorological1841to45madruoft https://archive.org/details/magneticalobser00indgoog The 19th-century Madras Observatory reports can be found at http://adsabs.harvard.edu/historical.html Rob van Gent -----Original Message----- From: tz-bounces(a)iana.org [mailto:tz-bounces@iana.org] On Behalf Of J William Piggott Sent: 20 August 2017 14:22 To: Ice Karma (J. Connell) 「氷宿縁」; Time Zone Mailing List Subject: Re: [tz] Fixed typos On 08/20/2017 12:17 AM, Ice Karma (J. Connell) 7¿ wrote: > I suspect "meterological" in the first diff hunk should actually read > "meteorological", rather than "metrological". It seems unlikely that the Madras Observatory was making weather reports. I imagine the author intended to write "astronomical" measurements. However, since it is written as a direct quote the mistake should be left as is, possibly with [sic]? > > â¬Ice Karma >

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