September 2011 - tz - lists.iana.org

Theory - zone name, zone creation, zone lifetime
by Mr tobias conradi Sept. 12, 2011

Sept. 12, 2011

Theory reads: To represent this data, the world is partitioned into regions whose clocks all agree about time stamps that occur after the somewhat-arbitrary cutoff point of the POSIX Epoch (1970-01-01 00:00:00 UTC). Issue: 1) Where are these regions listed? The only lists of geographical areas I could find are: - the zones in zone.tab - (current) countries in iso3166.tab Theory reads: Use ISO 3166 (see the file iso3166.tab) to help decide whether something is a country. [...] or when locations change countries (e.g. Hong Kong from UK colony to China) Issue: 1) "help to decide" - decision process is undefined. 2) Hong Kong is listed in iso3166.tab as HK.For the purpose of zone creation is it 2a) a country,then it is confusing to say it changed country, or 2b) is it part of China (CN) then it is confusing to mark it with HK 3) In case HK and one of the zones in CN observed the same time since 1970, and that HK is not a country, would there be a merge and would one zone be dropped from zone.tab and any corresponding pre-1970 history be deleted? Theory reads: Within a file name component, use only ASCII letters Issue: 1) It is not defined what the term "file name component" refers to in the context of zone naming. Theory reads: E.g. prefer `Paris' to `France', since France has had multiple time zones. Issue: 1) It does not matter what zones France "had" in the past. 2) It may matter that Europe/Paris might be split in the future. 3) There is no proof in zone.tab that France had multiple time zones at all, there is only one line marked "FR": FR+4852+00220Europe/Paris -- Tobias Conradi Rheinsberger Str. 18 10115 Berlin, Germany http://tobiasconradi.com

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Proclaimed changes to time of Newfoundland Time Zone for Daylight Savings Time
by Pelley, Michael Sept. 12, 2011

Sept. 12, 2011

Hi Folks, We received today, Monday, September 12, 2011, notification that the changes to the Newfoundland Standard Time Act have been proclaimed. The change in the Act stipulates that the change from Daylight Savings Time to Standard Time and from Standard Time to Daylight Savings Time now occurs at 2:00AM. I have included the text of the statute (URL http://www.assembly.nl.ca/legislation/sr/annualstatutes/2011/1106.chp.ht m <http://www.assembly.nl.ca/legislation/sr/annualstatutes/2011/1106.chp.h tm> ) and the official proclamation from THE NEWFOUNDLAND AND LABRADOR GAZETTE. Please update the TZ database to reflect this proclaimed change. Thank you. Cheers Mike ----------------------------------------------- MICHAEL PELLEY | Manager of Enterprise Architecture - Solution Delivery Office of the Chief Information Officer Executive Council Government of Newfoundland & Labrador P.O. Box 8700, 40 Higgins Line, St. John's NL A1B 4J6 709 729-7457 (t) | 709 729-6767 (f) | 709 690-2513 (c) | mpelley(a)gov.nl.ca <mailto:xxxxxxxxx@gov.nl.ca> “This email and any attached files are intended for the sole use of the primary and copied addressee(s) and may contain privileged and/or confidential information. Any distribution, use or copying by any means of this information is strictly prohibited. If you received this email in error, please delete it immediately and notify the sender.”

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data2011j
by Arthur David Olson Sept. 12, 2011

Sept. 12, 2011

The file... ftp://elsie.nci.nh.gov/pub/tzdata2011j.tar.gz ...is now available; this reflects the changes circulated recently on the times zone mailing list (contemporary changes for Samoa; past changes for Kenya, Uganda, and Tanzania); there are also two spelling corrections to comments in the australasia file (with thanks to Christos Zoulas). I expect another version will appear soon to handle changes in the Middle East (and perhaps in Russia); folks seeking to avoid version churn may want to wait a bit. --ado

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Re: no changes for 3 russian regions at this point
by Ruslan Ermilov Sept. 11, 2011

Sept. 11, 2011

Alexander Krivenyshev wrote: > Olson, Arthur David (NIH/NCI) [E] <olsona <at> > dc37a.nci.nih.gov> writes: > > > > > The latest 2011i tzdata does not have the Russian time > > > > change described by Alexander Krivenyshev: > > > "DRAFT DECISION OF THE GOVERNMENT OF Russian Federation... > > > > Does anyone know the current status of what was a draft > > decision at the time of Alexander's report? > > After some extensive media reports that 3 Russian regions may > change time zones this autumn and FIRST DRAFT DECISION OF THE > GOVERNMENT OF Russian Federation on August 8, 2011 about > upcoming changes on October 30, 2011: see link below: > (http://www.worldtimezone.com/dst_news/dst_news_russia33.html) > > there were some corrections done on August 25, 2011 on DRAFT > DECISION OF THE GOVERNMENT OF Russian Federation "On the > composition of the territories that make up each time zone, and > the procedure of calculation of time within time zones, and the > repeal of certain resolutions of the Government of the Russian > Federation", which shows NO time zones changes at this point > for Vladivostok (Primorsky region), Irkutsk region and Sakha > (Yakutia) will keep its current 3 time zones (MSK +6, +7, +8): > > 1. Vladivostok (Primorsky region) – will keep MSK+7 (UTC+11) > > 2. Sakha (Yakutia) – will keep its current 3 time zones: > MSK+6 (UTC+10), MSK+7 (UTC+11), MSK+8 (UTC+12) and > > 3. Irkutsk region – will keep MSK+5 (UTC+9) > > Original document (in Russian) on: > http://www.minpromtorg.gov.ru/docs/projects/531 > or > > http://www.worldtimezone.com/dst_news/dst_news_russia35.html > > I will keep my eyes open if there is any changes by October 30, > 2011. A final decision was made by Russian government on August 31, 2011, no. 725 (text in Russian): http://www.government.ru/gov/results/16355/ The contents of time zones didn't change since the draft.

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Datasource for IATA timezone files
by Karl Erik Bergaust Sept. 11, 2011

Sept. 11, 2011

Hi. Regarding Sources for Time Zone and Daylight Saving Time Data http://www.twinsun.com/tz/tz-link.htm International Air Transport Association timezone rules, are obtained from Innovata. http://www.innovata-llc.com/data/data.html ->> IATA Codes Data Files Regards Karl Erik

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Texas timezone history
by Jules Descartes Sept. 8, 2011

Sept. 8, 2011

I have reviewed the Texas timezone history before 1970. I attach my result, which proposes two additional Texas zones America/Houston and Amerca/Amarillo. I think there is an error in the current tzdata/northamerica file regarding Texas. It claims that Texas follows America/Chicago. But this is not the case as Texas had no DST in 1936, as Chicago did. Please check my data and my typing, as I am a bad typist.

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A small contribution to California timezone history
by Alois Treindl Sept. 8, 2011

Sept. 8, 2011

Calfornia, the US state with the highest population, seems to be one of the most regular timezone history, well represented by zone America/Los_Angeles. One exception has however been brought to my attention, which I report here, as a contribution to the completion of pre-1970 timezone history. # Information published to the Public Domain. # Palm Springs suffered under the shadow of Mt. San Jacinto and # decided to go on DST from 1946 Nov 17 for 120 days, # ending 1947 Mar 17. # Source: Beaver Valley Times, 1946 Nov 8, and other newspapers. # # Palm Springs is at 116w33. # Zone NAME GMTOFF RULES FORMAT [UNTIL] Zone America/Palm_Springs -7:36:12 - LMT 1883 Nov 18 12:23:48 -8:00 US P%sT 1946 Nov 17 02:00 -7:00 - PDT 1947 Mar 17 02:00 -8:00 CA P%sT 1967 -8:00 US P%sT

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re: Texas, typing corrections
by Jules Descartes Sept. 8, 2011

Sept. 8, 2011

Sorry I had several typing errors in the last paragraph of the attached file. I attach a corrected copy.

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Russian Time Zone
by Wong Ren Sept. 8, 2011

Sept. 8, 2011

Hi, The latest 2011i tzdata does not have the Russian time change described by Alexander Krivenyshev: "DRAFT DECISION OF THE GOVERNMENT OF Russian Federation "On the composition of the territories that make up each time zone, and the procedure of calculation of time within time zones, and the Repeal of certain resolutions of the Government of the Russian Federation on August 8, 2011" On October 30, 2011, at 02:00 local time the following new time calculations will be applied: Irkutsk region will use the 5th Russian time zone (MSK +4) Republic of Sakha (Yakutia) will use the 7th Russian time zone (MSK +6) Primorsky Krai (Vladivostok) will use the 7th Russian time zone (MSK +6)" It is not clear to me what's the exact impact for these additional changes to the original proposal . I have summarized what I think are the changes in the table below, could someone verify? TimeZone Current At 2011 Oct 30 2:00s Description Asia/Irkustsk GMT+9 (MSK+5) GMT+8 (MSK+4) Asia/Valdivostok GMT+11 (MSK+7) GMT+10(MSK+6) Asia/Yakulsk GMT+10 (MSK+6) GMT+10(MSK+6) No change. Republic of Sakha (Yakutia) ? Asia/Sakalin GMT+11 (MSK+7) GMT+10(MSK+6 Republic of Sakha (Yakutia) ? Asia/Magadan GMT+12 (MSK+8) GMT+10 (MSK+6) Republic of Sakha (Yakutia) ? Asia/Kamachatka GMT+12 (MSK+8) GMT+10 (MSK+6) Republic of Sakha (Yakutia) ? Asia/Anadyr GMT+12 (MSK+8) GMT+10 (MSK+6) Republic of Sakha (Yakutia) ? Essentially, GMT+9, GMT+11 and GMT+12 are entirely eliminated. Please confirm the above changes. Also based on the tzdata2011i, would the following changes apply? 2186d2185 < 8:00 - IRKT 2011 Oct 30 2:00s 2225,2226d2223 < 10:00 - VLAT 2011 Oct 30 2:00s < 2238,2239d2234 < 10:00 - SAKT 2011 Oct 30 2:00s < 2254d2248 < 10:00 - MAGT 2011 Oct 30 2:00s 2267d2260 < 10:00 - PETT 2011 Oct 30 2:00s 2278d2270 < 10:00 - ANAT 2011 Oct 30 2:00s ________________________________ "This e-mail message may contain confidential, commercial or privileged information that constitutes proprietary information of Comverse Technology or its subsidiaries. If you are not the intended recipient of this message, you are hereby notified that any review, use or distribution of this information is absolutely prohibited and we request that you delete all copies and contact us by e-mailing to: security(a)comverse.com. Thank You."

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Alabama timezone history
by Jules Descartes Sept. 6, 2011

Sept. 6, 2011

I have started reviewing pre-1970 US timezone history. The information is so complex that it is best approached state by state. I have started alphabetically with Alabama, but will probably continue with some mixture like - most populous states first - simplest states first For Alabama history my first draft proposes ten zones. This is more detailed than Shanks, wo distinguished seven areas. It is only a first step. Newspaper archive research (sadly) reveals that there are far more complex details involved in a complete history, and many questions about extension of zones can probably never be answered because there are not enough precise records. I have made a map, together with the help of colleagues, and uploaded it to wikimedia, as I am not sure whether image files work in this mailing list. Certainly we save bandwidth, as in the old times. License question: For now I have decided to place my work under the widest possible Creative Commons. This differs from the Public Domain license only in so far, as sources need to be quoted. Aside of that the use of the information is free, also within commercial projects of any kind. Please check and proof read the proposed zones. I am a bad typist.

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