October 2011 - tz - lists.iana.org

FW: Fiji DST 2011/12
by Olson, Arthur David (NIH/NCI) [E] Oct. 4, 2011

Oct. 4, 2011

I'm forwarding this message from Ken Rylander, who is not on the time zone mailing list. Those of you who are on the list, please direct replies appropriately. --ado -----Original Message----- From: Ken Rylander [mailto:ken.rylander@digicelgroup.com] Sent: Monday, September 19, 2011 7:45 To: tz(a)lecserver.nci.nih.gov Subject: Fiji DST 2011/12 Hi, Are there any updates about daylight savings for Fiji in 2011/12? Some websites (e.g. http://www.timeanddate.com/worldclock/clockchange.html?n=82) say it will be introduced again on Sunday, Oct 23, 2011. Regards, /Ken Rylander

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Changes to TZ database
by Colin Grey Oct. 3, 2011

Oct. 3, 2011

Hello, I was wondering if someone with your organization could give me an estimate on how many times there have been changes to the TZ database because of countries moving their DST dates or other changes. (over any time period would be fine) I'm asking because I've been making a series of educational videos on youtube and am currently working on one on time zones. If you're interested you can see my videos here: www.youtube.com/user/CGPGrey Thank you very much for any assistance you can provide, -Grey -- C. G. P. Grey Time Management Coach & Public Speaker www.CGPGrey.com

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Russian time zones: (painfully slow) progress report
by Arthur David Olson Oct. 2, 2011

Oct. 2, 2011

I don't know Russian which will make the following more convoluted than need be; I apologize in advance. We have reports of Russian time zone changes in 2011, as well as issues identified by Tobias Conradi. Sanjeev Gupta provided this link... http://government.consultant.ru/page.aspx?1223966 ...to Russian Government Decree #23 of 1992-01-08; eight ".png" scan files are available. 1992 Decree sections have bold headings; the headings include (in sequence): "2-M 3-M" "3-M 4-M" "4-M 5-M" "5-M 6-M" "6-M 7-M" "7-M 8-M" "8-M 9-M" "9-M 10-M" "10-M 11-M" "11-M 12-M" The sections seem to cover time zones from west to east. "московское" ("Moscow") appears in the "2-M 3-M" section. "Магаданская" ("Magadan") appears in the "10-M 11-M" section. The difference of eight between "2" and "10" matches the difference in hours between Moscow time and Magadan time. So we should have these associations: "2-M 3-M" Moscow "3-M 4-M" Moscow+1 "4-M 5-M" Moscow+2 "5-M 6-M" Moscow+3 "6-M 7-M" Moscow+4 "7-M 8-M" Moscow+5 "8-M 9-M" Moscow+6 Asia/Yakutsk "9-M 10-M" Moscow+7 Asia/Vladivostok "10-M 11-M" Moscow+8 Asia/Magadan "11-M 12-M" Moscow+9 Alexander Krivenyshev provided this link... http://www.government.ru/gov/results/16355/print/ ...to Russian Government Decree #725 of 2011-08-23. "Усть-Майский" ("Ust-Maya" or "Ust-Maysky" or "Ust'-Majskij") appears in the "8-M 9-M" (Moscow+6, Asia/Yakutsk) section of 1992's Decree 23. This matches 2011's Decree 725. It does not match the commentary in tzdata2011k's "europe" file, which has the area in Moscow+7, Asia/Vladivostok. Counter comments should be added. "Булунский" ("Bulun" or "Bulunskij") appears in the "8-M 9-M" (Moscow+6, Asia/Yakutsk) section of 1992's Decree 23. This matches 2011's Decree 725. It does not match the commentary in tzdata2011k's "europe" file, which has the area in Moscow+7, Asia/Vladivostok. Counter comments should be added. "Томпонский" ("Tomponsky" or "Tomponskij") appears in the "9-M 10-M" (Moscow+7, Asia/Vladivostok) section of 1992's Decree 23. 2011's Decree 725 has it at Moscow+6, Asia/Yakutsk. tzdata2011k's "europe" file has it as part of Asia/Vladivostok. It must have shifted at some unknown instant between 1992 and 2011; we need a new zone (Asia/Khandyga) for Tomponsky. "Оймяконский" ("Oimkayon" or "Ojmyaknoskij") appears in the "9-M 10-M" (Moscow+7, Asia/Vladivostok) section of 1992's Decree 23. This matches 2011's Decree 725. It does not match the commentary in tzdata2011k's "europe" file, which has the area in Moscow+8, Asia/Magadan. Counter comments should be added. "Сахали" ("Sakhalin") appears in the "9-M 10-M" (Moscow+7, Asia/Vladivostok) section of 1992's Decree 23; I can't find any instance of "Курильский" or "Курильские" ("Kuril") in 1992's decree. 2011's Decree 725 has most of the Sakhalin Oblast (including the "South-Kuril region") at Moscow+7 and has the "North-Kuril region" at Moscow+8. tzdata2011k's "europe" file has an Asia/Sakhalin zone and no Kuril zones (but some Kuril comments). tzdata2011k's Asia/Sakhalin is Moscow+8 until 1997-03-20 02:00:00, Moscow+7 thereafter; Gwillim Law's IATA SSIM research led to the conclusion that Sakhalin (in particular, Yuzhno-Sakhalin) switched in 1997 (while all the Kurils remained at Moscow+8). We need a new zone (Asia/Severo-Kirilsk) for North-Kuril if that area was indeed Moscow+7 in 1992 and is Moscow+8 now. We need a new zone (Asia/Yuzhno-Kirilsk) for South-Kiril if that area did indeed begin to differ from Asia/Sakhalin in 1997. "Новосибирск" ("Novosibirsk") appears in the "5-M 6-M" (Moscow+3) section of 1992's Decree 23. 2011's Decree 725 also has Novosibirsk at Moscow+3. However, tzdata2011k's "europe" file claims that it was at Moscow+4 until 1993-05-23. "Томская" ("Tomsk") appears in the "5-M 6-M" (Moscow+3) section of 1992's Decree 23. 2011's Decree 725 also has Tomsk at Moscow+3. However... http://newsru.com/russia/01may2002/clock.html ...claims that it switched from Moscow+4 to Moscow+3 on 2002-05-01 (if translate.google.com is correct). We also have... # From Stanislaw A. Kuzikowski (1994-06-29): # But now it is some months since Novosibirsk is 3 hours ahead of Moscow! # I do not know why they have decided to make this change; # as far as I remember it was done exactly during winter->summer switching # so we (Novosibirsk) simply did not switch. # Tomsk is still 4 hours ahead of Moscow. ...which would indicate that Novosibirsk and Tomsk switched from Moscow+4 to Moscow+3 (and at different instants to boot). It looks as if we need an Asia/Tomsk zone (Tomsk being the most populous city in Tomsk Oblast). Since folks in Tomsk can use the Novosibirsk rules for current times, I'd hope to get better information on time history in Tomsk and Novobirsk (in particular if and when there were transitions from Moscow+4 to Moscow+3) before creating the new zone. --ado

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DateTime::TimeZone::Tzfile for tz-link.htm
by Zefram Oct. 1, 2011

Oct. 1, 2011

(I sent this a week ago but it seems to have been lost.) Possible addition to the "Other tz binary file readers" part of tz-link.htm: <li> <a href="http://search.cpan.org/perldoc?DateTime::TimeZone::Tzfile">DateTime::TimeZone::Tzfile</a> is a <code>tz</code> binary file reader written in Perl. It is freely available under the same terms as Perl (dual <abbr>GPL</abbr> and Artistic license). </li> You already have a note about DateTime::TimeZone in a different section. There's work underway to make DT:TZ use DT:TZ:Tzfile for its Olson needs, but currently they're essentially unrelated. -zefram

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America/Sitka LMT bug
by Zefram Oct. 1, 2011

Oct. 1, 2011

(I sent this a week ago but it seems to have been lost.) I noticed this recent addition to the database: |Zone America/Sitka -14:58:47 - LMT 1867 Oct 18 | -9:01:13 - LMT 1900 Aug 20 12:00 | -8:00 - PST 1942 ... For local mean time to jump by 5.6 hours, implying that the city jumped 89 degrees to the east, would be a neat trick. Obviously the first offset is meant to be +14:58:47, and the city jumped by 24 hours or 360 degrees, crossing the IDL. -zefram

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