- tz - lists.iana.org

[PATCH] * tz-link.html: Update URLs.
by Paul Eggert April 22, 2020

April 22, 2020

--- tz-link.html | 14 ++++++++------ 1 file changed, 8 insertions(+), 6 deletions(-) diff --git a/tz-link.html b/tz-link.html index 90cc9bd..1f893f6 100644 --- a/tz-link.html +++ b/tz-link.html @@ -82,11 +82,12 @@ title="Berkeley Software Distribution">BSD</abbr></a>, <a href="https://www.openbsd.org">Open<abbr>BSD</abbr></a>, <a href="https://www.chromium.org/chromium-os">Chromium OS</a>, <a href="https://cygwin.com">Cygwin</a>, +<a href="https://mariadb.org">MariaDB</a>, <a href="https://en.wikipedia.org/wiki/MINIX">MINIX</a>, <a href="https://www.mysql.com">MySQL</a>, <a href="https://en.wikipedia.org/wiki/WebOS"><abbr title="Web Operating System">webOS</abbr></a>, -<a href="https://ibm.com/aix"><abbr +<a href="https://en.wikipedia.org/wiki/IBM_AIX"><abbr title="Advanced Interactive eXecutive">AIX</abbr></a>, <a href="https://en.wikipedia.org/wiki/BlackBerry_10">BlackBerry 10</a>, <a href="https://www.apple.com/ios"><abbr @@ -168,7 +169,8 @@ then <samp>za</samp> through <samp>zz</samp>, then <samp>zza</samp> through <samp>zzz</samp>, and so on). Since version 2016h, each release has contained a text file named "<samp>version</samp>" whose first (and currently only) line is the version. -The releases are also available in an +Older releases are <a href="https://ftp.iana.org/tz/releases/">archived</a>, +and are also available in an <a href="ftp://ftp.iana.org/tz/releases/"><abbr title="File Transfer Protocol">FTP</abbr> directory</a> via a less-secure protocol.</p> @@ -827,10 +829,10 @@ zones and daylight saving time</a>.</dd> Chile's official time (in Spanish)</a>.</dd> <dt>China</dt> <dd>The Hong Kong Observatory maintains a -<a href="https://www.hko.gov.hk/gts/time/Summertime.htm">history of +<a href="https://www.hko.gov.hk/en/gts/time/Summertime.htm">history of summer time in Hong Kong</a>, and Macau's Meteorological and Geophysical Bureau maintains a <a -href="http://www.smg.gov.mo/smg/geophysics/e_t_Summer%20Time.htm">similar +href="https://www.smg.gov.mo/en/subpage/224/page/174">similar history for Macau</a>. Unfortunately the latter is incomplete and has errors.</dd> <dt>Czech Republic</dt> @@ -866,7 +868,7 @@ href="https://www.dia.govt.nz/Daylight-Saving-History">History of Daylight Saving</a>.</dd> <dt>Singapore</dt> <dd><a id="Singapore" -href="http://www.math.nus.edu.sg/~mathelmr/teaching/timezone.html">Why +href="https://web.archive.org/web/20190822231045/http://www.math.nus.edu.sg/~math…">Why is Singapore in the "Wrong" Time Zone?</a> details the history of legal time in Singapore and Malaysia.</dd> <dt>United Kingdom</dt> @@ -881,7 +883,7 @@ Time Zone Proceedings</a> lists changes to time zone boundaries.</dd> <dt>Uruguay</dt> <dd>The Oceanography, Hydrography, and Meteorology Service of the Uruguayan Navy (SOHMA) publishes an annual <a -href="http://www.armada.gub.uy/sohma/index.php/servicios/datos-astronomicos" hreflang="es">almanac +href="http://sohma.armada.mil.uy/index.php/servicios/datos-astronomicos" hreflang="es">almanac (in Spanish)</a>.</dd> </dl> </section> -- 2.17.1

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Re: [tz] Errors in man pages, here: tzfile(5): Typo?
by Paul Eggert April 21, 2020

April 21, 2020

On 4/20/20 10:52 PM, Michael Kerrisk (man-pages) wrote: > --- a/man5/tzfile.5 > +++ b/man5/tzfile.5 > @@ -41,6 +41,7 @@ in order: > .TP > .I tzh_ttisgmtcnt > The number of UT/local indicators stored in the file. > +(UT is Universal Time.) Thanks. I looked for similar problems elsewhere and found one in zic.8, so I installed the attached patch. This should appear in the next tzdb release, which is due soon.

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Data for China timezones in backzone
by Phake Nick April 15, 2020

April 15, 2020

First of all, for some reason there is a Vietnamese timezone which got sandwiched between time zone of China in the backzone file, I think that should be reordered for better clarity Second, the historical timezone data for those China zones seems to be incorrect. The transition to GMT+8 date given there for these zones were 1980 which also contradict the file description that they do not disagree with normal zone after 1970. According to sources that have also been cited in the asia file, except Xinjiang and Tibet, they should have adopted the Beijing Time from around 1949/1950 depends on exactly when each of those cities were taken over by the communist army. And they should also follow the DST setting of Asia/Shanghai after that point of time. In addition, http://gaz.ncl.edu.tw/detail.jsp?sysid=E1091792 the document from Chongqing Nationalist government say in year 1945 all of China should adopt summer time due to the war (not sure whether it continued after WWII ends)(Probably only enforced in area under their rule at the time?) The Asia/Harbin's 1932 and 1940 entry should also be incorrect. As per sources recorded at https://wiki.suikawiki.org/n/%E6%BA%80%E5%B7%9E%E5%9B%BD%E3%81%AE%E6%A8%99%… , in 1932 Harbin should have adopted UTC+8:00 instead of data currently listed in the tz database according to official announcement from Manchuko. And they should have adopted GMT+9 in 1937 January 1st according to official announcement at the time being cited on the webpage.

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Asia/Shanghai timezone history and other information
by Phake Nick April 15, 2020

April 15, 2020

1. According to This news report: http://news.sina.com.cn/c/2004-09-01/19524201403.shtml , on April 11, 1919, newspaper in Shanghai said clocks in Shanghai will spring forward for an hour starting from midnight of that Saturday. The report did not mention what happened in Shanghai thereafter, but it mentioned that a similar trial in Tianjin which ended at October 1st as citizens are told to recede the clock on September 30 from 12:00pm to 11:00pm. The trial at Tianjin got terminated in 1920. 2. For the history of time in Shanghai between 1940-1942, the situation is actually slightly more complex than the table included in the tz database now. At the time, there were three different authorities in Shanghai, including Shanghai International Settlement, a settlement established by western countries with its own westernized form of government, Shanghai French Concession, similar to the international settlement but is controlled by French, and then the rest of the city of Shanghai, which have already been controlled by Japanese force through a puppet local government (Wang Jingwei regime) It was additionally complicated by the circumstances that, according to the 1940s Shanghai summer time essay cited in the database, some departments/businesses/people in the Shanghai city itself during that time period, refused to change their clock and instead only changed their opening hours. For example, as quoted in the article, in 1940, other than the authority itself, power, tram, bus companies, cinema, department stores, and other public service organizations have all decided to follow the summer time and spring forward the clock. On the other hand, the custom office refused to spring forward the clock because of worry on mechanical wear to the physical clock, postal office refused to spring forward because of disruption to business and log-keeping, although they did changed their office hour to match rest of the city. So is travel agents, and also weather observatory. It is said both time standards had their own supporters in the city at the time, those who prefer new time standard would have moved their clock while those who prefer the old time standard would keep their clock unchange, and there were different clocks that use different time standard in the city at the time for people who use different time standard to adjust their clock to their preferred time. 2.a. For the 1940 May 31 spring forward, the essay claim that it was coordinared between the international settlement authority and the French concession authority and have gathered support from Hong Kong and Xiamen, that it would spring forward an hour from May 31 "midnight", and the essay claim "Hong Kong government implemented the spring forward in the same time on the same date as Shanghai". 2.b. For the 1940 fall back, it was said that they initially intended to do so on September 30 00:59 at night, however they postponed it to October 12 after discussion with relevant parties. However schools restored to the original schedule ten days earlier. 2.c. For the 1941 spring forward, it is said to start from March 15 "following the previous year's method", and in addition to that the essay cited an announcement in 1941 from the Wang regime which said the Special City of Shanghai under Wang regime control will follow the DST rule set by the Settlements, irrespective of the original DST plan announced by the Wang regime for other area under its control(April 1 to September 30). (no idea to situation before that announcement) 2.d. For the 1941 fall back, it was said that the fall back would occurs at the end of September (A newspaper headline cited by the essay, published on October 1, 1941, have the headlines which said "French Concession would rewind to the old clock this morning), but it ultimately didn't happen due to disagreement between the international settlement authority and the French concession authority, and the fall back ultimately occurred on November 1. 2.e. In 1941 December, Japan have officially started war with the United States and the United Kingdom, and in Shanghai they have marched into the international settlement, taken over its control 2.f. For the 1942 spring forward, the essay said that the spring forward started on January 31. It said this time the custom office and postal department will also change their clocks, unlike before. 2.g. The essay itself didn't cover any specific changes thereafter until the end of the war, it quoted a November 1942 command from the government of the Wang regime, which claim the daylight saving time applies year round during the war. However, the essay ambiguously said the period is "February 1 to September 30", which I don't really understand what is the meaning of such period in the context of year round implementation here.. More researches might be needed to show exactly what happened during that period of time. 3. According to a Japanese tour bus pamphlet in Nanjing area believed to be from around year 1941: http://www.tt-museum.jp/tairiku_0280_nan1941.html , the schedule listed was in the format of Japanese time. Which indicate some use of the Japanese time (instead of syncing by DST) might have occurred in the Yangtze river delta area during that period of time although the scope of such use will need to be investigated to determine. ---- Other information: i. The HKO link reference link in Asia/HongKong have already become inaccessible probably due to site update. The link can now be accessed from https://www.hko.gov.hk/en/gts/time/Summertime.htm

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Morocco : Time Change
by Semlali Naoufal April 15, 2020

April 15, 2020

Hello, Following the announcement by the Moroccan government, the switch to GMT time will take place on Sunday, April 19, 2020 from 3 a.m. and the return to GMT+ 1 time will take place on Sunday, May 31, 2020 at 2 a.m. and not Sunday May 24, 2020 as described at the TMZ base. To this end, thank you for updating the TMZ database to take this change into account. Attached the official decision of the government. https://maroc-diplomatique.net/maroc-le-retour-a-lheure-gmt-est-prevu-diman… http://aujourdhui.ma/actualite/gmt1-retour-a-lheure-normale-dimanche-procha… Best Regards, De : Tim Parenti <tim(a)timtimeonline.com<mailto:tim@timtimeonline.com>> Envoyé : lundi 30 septembre 2019 17:05 À : Naoufal Semlali <N.Semlali(a)iam.ma<mailto:N.Semlali@iam.ma>> Cc : Paul Eggert <eggert(a)cs.ucla.edu<mailto:eggert@cs.ucla.edu>>; Maamar Abdelkader <A.MAAMAR(a)iam.ma<mailto:A.MAAMAR@iam.ma>>; Time zone mailing list <tz(a)iana.org<mailto:tz@iana.org>> Objet : Re: [tz] Morocco Time must stay at GMT+1 We updated Morocco with year-round UTC+1 (except during Ramadan) about a year ago in these commits: https://github.com/eggert/tz/commit/80de44ca0f2349c0f42f12caa943ced8685c3b67 https://github.com/eggert/tz/commit/8539a448ebc8897e40d62f16dc4d0ada3f07b3ca If there are still errors in tz for Morocco in 2018g or later, please let us know. Otherwise, it sounds like you need to update your time zone definitions with a more recent version. -- Tim Parenti On Mon, 30 Sep 2019 at 11:40, Naoufal Semlali <N.Semlali(a)iam.ma<mailto:N.Semlali@iam.ma>> wrote: Good Morning, I want to inform you that Morocco is not concerned by the transition to the winter time which will take place in Europe on the night of Saturday, October 26 to Sunday, October 27, 2019. Morocco's schedule must stay on GMT+1 The schedule change take place only before and after the month of Ramadan. Best Regards De : Naoufal Semlali Envoyé : jeudi 18 avril 2019 08:27 À : 'Paul Eggert' <eggert(a)cs.ucla.edu<mailto:eggert@cs.ucla.edu>> Cc : Time zone mailing list <tz(a)iana.org<mailto:tz@iana.org>>; Maamar Abdelkader <A.MAAMAR(a)iam.ma<mailto:A.MAAMAR@iam.ma>> Objet : RE: Will Morocco switch from +01 to +00 during Ramadan next year? Hello, The predictions below seem to be correct based on the latest official declarations of the Moroccan government. Of course, if there will be any change, we will keep you informed. Thanks. Semlali -----Message d'origine----- De : Paul Eggert <eggert(a)cs.ucla.edu<mailto:eggert@cs.ucla.edu>> Envoyé : mercredi 17 avril 2019 19:04 À : Naoufal Semlali <N.Semlali(a)iam.ma<mailto:N.Semlali@iam.ma>> Cc : Time zone mailing list <tz(a)iana.org<mailto:tz@iana.org>>; Maamar Abdelkader <A.MAAMAR(a)iam.ma<mailto:A.MAAMAR@iam.ma>> Objet : Re: Will Morocco switch from +01 to +00 during Ramadan next year? On 4/17/19 12:24 AM, Naoufal Semlali wrote: > > Please confirm also that the switch to GMT+1 on Sunday, June 9th 2019 > at 2 am is already implemented in the tzdata. > Yes, I checked that too. For what it's worth, here are the tzdata 2018h-and-later predictions for Africa/Casablanca through the year 2037. The columns are the date, the hour just after the transition, the UTC offset just after the transition, and (optionally) 1 if (negative) DST is in effect. These predictions could well be wrong: if you have better info please let us know. 2019-05-05 02 +00 1 2019-06-09 03 +01 2020-04-19 02 +00 1 2020-05-24 03 +01 2021-04-11 02 +00 1 2021-05-16 03 +01 2022-03-27 02 +00 1 2022-05-08 03 +01 2023-03-19 02 +00 1 2023-04-23 03 +01 2024-03-10 02 +00 1 2024-04-14 03 +01 2025-02-23 02 +00 1 2025-04-06 03 +01 2026-02-15 02 +00 1 2026-03-22 03 +01 2027-02-07 02 +00 1 2027-03-14 03 +01 2028-01-23 02 +00 1 2028-02-27 03 +01 2029-01-14 02 +00 1 2029-02-18 03 +01 2029-12-30 02 +00 1 2030-02-10 03 +01 2030-12-22 02 +00 1 2031-01-26 03 +01 2031-12-14 02 +00 1 2032-01-18 03 +01 2032-11-28 02 +00 1 2033-01-09 03 +01 2033-11-20 02 +00 1 2033-12-25 03 +01 2034-11-05 02 +00 1 2034-12-17 03 +01 2035-10-28 02 +00 1 2035-12-02 03 +01 2036-10-19 02 +00 1 2036-11-23 03 +01 2037-10-04 02 +00 1 2037-11-15 03 +01 ________________________________ [Description : cid:image002.jpg@01CC9EE4.44A57D10]Eco – geste: privilégiez la sauvegarde électronique, si nécessaire imprimez en recto-verso ________________________________ Ce message et toutes les pièces jointes sont adressés à l'attention exclusive de leurs destinataires et sont strictement confidentiels. Si vous le recevez par erreur, merci de le détruire après en avoir informé l'expéditeur sans délai. Toute divulgation, copie ou usage par une personne autre que son destinataire sont interdits. Maroc Telecom décline toute responsabilité pour toute altération, déformation ou falsification subie par le message au cours de sa transmission. Retrouvez toutes les informations de Maroc Telecom sur www.iam.ma<http://www.iam.ma> . ________________________________ This message and its attachments are intended only for the person or entity to which it is addressed and are strictly confidential. If you have received this in error, please delete the material from any computer after having informed the sender. Any copy or other use of this information by persons or entities other than the intended recipient is prohibited. Maroc Telecom accepts no liability for any alteration, distortion or falsification that may occur during the transmission of this message. 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Morocco Ramadan 2020
by Milamber April 14, 2020

April 14, 2020

Hello, The Government of Kingdom of Morocco have publish the changes of time for next Ramadan month (2020) [1] : Google Translation: The Ministry of Economy, Finance and Administration Reform - Department of Administration Reform - announces that on the holy month of Ramadan, the Kingdom of Morocco will return to legal time of the Kingdom (GMT) by delaying the time by 60 minutes and this on Sunday April 19 at 03:00 am In accordance with article II of the decree n ° 2.18.855 (October 26, 2018) relating to the legal time of the Kingdom, and to the decision of the Head of Government No. 3.25.20 (published on April 13, 2020) concerning the legal time. The Kingdom of Morocco will return to the schedule (GMT +1) by adding sixty (60) minutes to legal time on Sunday, May 31, 2020 at 2:00 a.m. Actually, the tzdata show (Debian 10) tzdata 2019c-0+deb10u1 : # zdump -v /usr/share/zoneinfo/Africa/Casablanca | grep 2020 /usr/share/zoneinfo/Africa/Casablanca Sun Apr 19 01:59:59 2020 UT = Sun Apr 19 02:59:59 2020 +01 isdst=0 gmtoff=3600 /usr/share/zoneinfo/Africa/Casablanca Sun Apr 19 02:00:00 2020 UT = Sun Apr 19 02:00:00 2020 +00 isdst=1 gmtoff=0 /usr/share/zoneinfo/Africa/Casablanca Sun May 24 01:59:59 2020 UT = Sun May 24 01:59:59 2020 +00 isdst=1 gmtoff=0 /usr/share/zoneinfo/Africa/Casablanca Sun May 24 02:00:00 2020 UT = Sun May 24 03:00:00 2020 +01 isdst=0 gmtoff=3600 thanks for update. Regards, Milamber * [1] https://www.mmsp.gov.ma/fr/actualites.aspx?id=1940

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DST in Morocco
by Magnus Fromreide April 14, 2020

April 14, 2020

Hello. It seems as if Morocco have decided that Ramadan ends on 2020-05-31, not 2020-05-24 which is what was previously assumed. Source (in arabic): http://www.sgg.gov.ma/Portals/1/BO/2020/B.O_6873_Ar.pdf?ver=2020-04-14-1321… Especially page 2082 (page 4 of the document) /MF

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DB incoherence
by Américo Mendes April 7, 2020

April 7, 2020

Hi, Was trying to use your DB and I found what I think it's a data incoherence... When you list the rules, i suppose that they must be in chronological order, I'm assuming that* (X) rule start date always smaller than (X+1) rule start date*, for instance: R Q 1967 o - Ap 8 0 1 D R Q 1967 1968 - S Su>=8 0 0 S R Q 1968 o - Ap 14 0 1 D R Q 1969 1977 - Ap lastSu 0 1 D R Q 1969 1971 - O lastSu 0 0 S R Q 1972 1974 - O 8 0 0 S R Q 1975 1977 - O lastSu 0 0 S I fund in the Haiti rules the following section: R HT 1983 o - May 8 0 1 D R HT 1984 1987 - Ap lastSu 0 1 D R HT 1983 1987 - O lastSu 0 0 S According to my assumption, to keep DB coherence, we should have, in 2nd position something like: R HT 1983 o - O lastSu 0 0 S Am I right or is it some particularity that I didn't understand? Best Regards. Américo Mendes <https://www.avast.com/sig-email?utm_medium=email&utm_source=link&utm_campai…> Sem vírus. www.avast.com <https://www.avast.com/sig-email?utm_medium=email&utm_source=link&utm_campai…> <#DAB4FAD8-2DD7-40BB-A1B8-4E2AA1F9FDF2>

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Most of Mexico to spring forward tomorrow, as scheduled
by Paul Eggert April 4, 2020

April 4, 2020

Although most of Mexico is scheduled to spring forward tomorrow at 02:00, earlier this week Claudia Reyes Montiel, representing the caucus of the Mexican Party of the Democratic Revolution (PRD), asked Mexican president Andrés Manuel López Obrador (AMLO) to cancel or suspend DST in the light of the COVID-19 pandemic. AMLO has punted on this for now, saying that he first wants a technical opinion from the Ministry of Energy. One never knows with AMLO though, and it might be good to keep an eye out for sudden changes to Mexico's civil-time rules. My source: Horario de Verano 2020: Diputados del PRD le piden a AMLO eliminar el cambio. La Verdad. 2020-04-02. https://laverdadnoticias.com/politica/Horario-de-Verano-2020-Diputados-del-…

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TZ Data Base Questions
by Dustin J. Dirth April 2, 2020

April 2, 2020

Hello, A group of developers including myself has been charged with dealing with time zones in our database. We have been looking into using the IANA TZ Database as our source. In order to create utilities to get historical data correctly, and to future proof our code as much as possible, there were a couple of questions we have been trying to find the answers to. * If an entity breaks off from a current time zone, does the data base fork the current time zone(A) and add a new time zone(B) with time zone B having all the historical data of A? * In the INANA time zone database, the file "europe" contains information for Time Zone Europe/Dublin. There are three lines that are proceeded with the comment "# These three lines are for when SAVE values are always nonnegative." These lines are also preceded by comment Delimiter (Please see below). Since the data follows the Comment Delimiter it is ignored on load. Is database supposed to load this information? What is the purpose of these comments? # These three lines are for when SAVE values are always nonnegative. # 1:00 - IST 1971 Oct 31 2:00u # 0:00 GB-Eire GMT/IST 1996 # 0:00 EU GMT/IST

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