- tz - lists.iana.org

Chile to end DST earlier this year?
by Paul Eggert Feb. 14, 2014

Feb. 14, 2014

I've heard rumors that Chile will end DST at the end of March 8 this year, rather than the tz database's guess of the end of April 26. Can anyone confirm this? I can't seem to find anything official, but my Spanish is not the best. Thanks.

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posix timestamp compatibility library for systems using right timestamp
by Marek Behun Feb. 12, 2014

Feb. 12, 2014

Hello, I have written a small POSIX timestamp compatibility library for glibc/linux systems which use right timestamp on system clock (and also a 'right/' timezone). By executing a program with LD_PRELOAD=/path/to/time2posix.so environment variable the program can still use a 'posix/' timezone and display system time correctly (system calls for getting/setting system time are patched byt time2posix.so). I wrote this library primarily for synchronizing time from NTP servers that use UTC. This way, when using for example ntpdate to synchronize from such a server, ntpdate doesn't have to be patched to synchronize to right timestamp (instead of posix). The library could also be used on programs that cannot use 'right/' timezone (for example PostgreSQL can't handle leap seconds and therefore won't accept a 'right/' timezone in configuration). For that though more system call patches need to be implemented. The sources can be found at https://github.com/elkablo/time2posix I would like to know if I should continue developing this library or if there are other ways of synchronizing to right timestamp correctly, or if right timestamp and consequently right timezones aren't used at all. Marek Behun

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Glibc 2.19 adds support for version 3 tz format
by Paul Eggert Feb. 12, 2014

Feb. 12, 2014

The GNU C Library version 2.19, released February 8, adds support for version-3 format tz binary files. I thought I'd give this list a heads-up, in case other C-library maintainers are lurking and want to keep up with the Joneses. As you may recall, version 3 is a minor extension to the binary format, which adds support for some less-common timekeeping practices. So far, the only tz-database timestamps affected by this change are time stamps after the year 2037 in America/Godthab with tz data 2013e or later. These time stamps cannot be described by a POSIX TZ string, so version 3 uses the quasi-POSIX string 'WGT3WGST,M3.5.0/-2,M10.5.0/-1'. The glibc 2.19 announcement is at <https://sourceware.org/ml/libc-alpha/2014-02/msg00224.html>. More details about this change can be found at <https://sourceware.org/bugzilla/show_bug.cgi?id=15968>.

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Greenwich Time and Longitude
by Brian Inglis Feb. 6, 2014

Feb. 6, 2014

On 2014-02-06 03:58, David Malone wrote: > I think a version of this story is included in Derek Howse's > "Greenwich Time and Longitude" book, in relation to the shutting > down of the telegraph-based time service from Greenwich. See > here, on page 115: > > https://archive.org/details/GreenwichTime > > He even gives a reference for the story. > > David. > _______________________________________________ > time-nuts mailing list -- time-nuts(a)febo.com > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. Forwarded from comp.time.nuts - the link is to an online and downloadable document comprehensively referencing the histories of the distribution of standard times, the establishment of standard time zones, and some of the absurdities uncovered. -- Take care. Thanks, Brian Inglis

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Re: [tz] CIA confused about Cedros Island time zone?
by Steve Jones Feb. 6, 2014

Feb. 6, 2014

At 15:48 2/5/2014, vanadovv(a)hetnet.nl wrote: >My 2 cents: >(1) Isla Cedros is part of Ensenada, Baja California ><http://es.wikipedia.org/wiki/Isla_Cedros>http://es.wikipedia.org/wiki/Isla_Cedros Correct. Baja is Pacific time, Baja Sur is mountain time. >(2) The aeroport seems to be on UTC-7 ><http://worldaerodata.com/wad.cgi?id=MX00386&sch=MM10>http://worldaerodata.com/wad.cgi?id=MX00386&sch=MM10 I believe there is a good chance that record is incorrect. If so it probably has its roots in the original CIA error. http://www.gcmap.com/airport/CDI shows it to be Pacific Time, UTC-8 (DST-7). I've sent an email to the two airlines that report offering charter service to the Island, seeking clarification. The airport itself appears to be just an unmanned paved airstrip, so I don't know who else to contact for confirmation. Regards, Steve Jones []

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CIA confused about Cedros Island time zone?
by vanadovv＠hetnet.nl Feb. 5, 2014

Feb. 5, 2014

Re: [tz] CIA confused about Cedros Island time zone? Steve Jones stevejones at OnTimeZone.com Sun Feb 2 23:41:18 UTC 2014 ....... That map, and the maps it was derived from (including the original source, the CIA) show Cedros Island as being UTC-7 (as if it were in Baja Sur, not Baja). The border between Baja and Baja Sur is on the 28th parallel, which lies south of Cedros Island. Baja is in the Pacific Time zone, UTC-8. Baja Sur is in the Mountain time zone, UTC-7. I find multiple references confirming that Cedros Island is part of Baja, thus UTC-8. I find no references making any allusion to the official or unofficial observed time on the island to be other than UTC-8. .... My 2 cents: (1) Isla Cedros is part of Ensenada, Baja California http://es.wikipedia.org/wiki/Isla_Cedros (2) The aeroport seems to be on UTC-7 http://worldaerodata.com/wad.cgi?id=MX00386&sch=MM10 Oscar van Vlijmen

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CIA confused about Cedros Island time zone?
by Steve Jones Feb. 5, 2014

Feb. 5, 2014

At 07:38 2/2/2014, Arthur David Olson wrote: > From Randy Olson (no known relation), a map of solar time versus clock time: > ><https://twitter.com/randal_olson/statuses/429969774831882242>https://twitter.com/randal_olson/statuses/429969774831882242 That map, and the maps it was derived from (including the original source, the CIA) show Cedros Island as being UTC-7 (as if it were in Baja Sur, not Baja). The border between Baja and Baja Sur is on the 28th parallel, which lies south of Cedros Island. Baja is in the Pacific Time zone, UTC-8. Baja Sur is in the Mountain time zone, UTC-7. I find multiple references confirming that Cedros Island is part of Baja, thus UTC-8. I find no references making any allusion to the official or unofficial observed time on the island to be other than UTC-8. This seems to be a significant error, not I presume the type the CIA normally makes... so I am wondering if I've missed something. Thoughts? Regards, Steve Jones, St. Louis, MO Emacs!

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credit for "right" zone code
by Steve Allen Feb. 5, 2014

Feb. 5, 2014

I want to be sure to give credit where credit is due for the code that handles leap seconds in the "right" zones. The comments in tzcode indicate that Arthur David Olson and Bradley White are two who deserve credit. Are there others who have contributed to that capability? -- Steve Allen <sla(a)ucolick.org> WGS-84 (GPS) UCO/Lick Observatory--ISB Natural Sciences II, Room 165 Lat +36.99855 1156 High Street Voice: +1 831 459 3046 Lng -122.06015 Santa Cruz, CA 95064 http://www.ucolick.org/~sla/ Hgt +250 m

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question about Asia/Urumqi: why Guangdong
by Alois Treindl Feb. 3, 2014

Feb. 3, 2014

In the commentary for zone Asia/Urumqi one reads # Xin-zang Time ("Xinjiang-Tibet Time") # The Gansu counties Aksay, Anxi, Dunhuang, Subei; west Qinghai; # the Guangdong counties Xuwen, Haikang, Suixi, Lianjiang, # Zhanjiang, Wuchuan, Huazhou, Gaozhou, Maoming, Dianbai, and Xinyi; # east Tibet, including Lhasa, Chamdo, Shigaise, Jimsar, Shawan and Hutubi; # east Xinjiang, including Urumqi, Turpan, Karamay, Korla, Minfeng, Jinghe, # Wusu, Qiemo, Xinyan, Wulanwusu, Jinghe, Yumin, Tacheng, Tuoli, Emin, # Shihezi, Changji, Yanqi, Heshuo, Tuokexun, Tulufan, Shanshan, Hami, # Fukang, Kuitun, Kumukuli, Miquan, Qitai, and Turfan. Question: what is the rationale for having the Guangdong counties listed for this zone? Guangdong is the province around Hongkong, with latitude around 20n and longitude around 115e. This is geographically very far away from east Tibet and east Xinjiang, altitude around 40n and loangitude less than 82e. What is the source for listing Guangdong here? I presume that this is an error.

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[PATCH] Mention Maggiolo's map of solar vs standard time.
by Paul Eggert Feb. 2, 2014

Feb. 2, 2014

* tz-link.htm: Add URL and description. (Thanks to Arthur David Olson.) * NEWS: Document this. --- NEWS | 3 +++ tz-link.htm | 6 +++++- 2 files changed, 8 insertions(+), 1 deletion(-) diff --git a/NEWS b/NEWS index 46b0160..bbc2b74 100644 --- a/NEWS +++ b/NEWS @@ -30,6 +30,9 @@ Unreleased, experimental changes CLDR data is available in both XML and JSON form. + Mention Maggiolo's map of solar vs standard time. + (Thanks to Arthur David Olson.) + Update two links. (Thanks to Oscar van Vlijmen.) Fix some formatting glitches, e.g., remove random newlines from diff --git a/tz-link.htm b/tz-link.htm index 57ada61..596a82a 100644 --- a/tz-link.htm +++ b/tz-link.htm @@ -8,7 +8,7 @@ <meta http-equiv="Content-type" content='text/html; charset="US-ASCII"'> <meta name="DC.Creator" content="Eggert, Paul"> <meta name="DC.Contributor" content="Olson, Arthur David"> -<meta name="DC.Date" content="2014-01-30"> +<meta name="DC.Date" content="2014-02-02"> <meta name="DC.Description" content="Sources of information about time zones and daylight saving time"> <meta name="DC.Identifier" @@ -429,6 +429,10 @@ has several fancy time zone maps; it covers Russia particularly well. The maps' pictorial quality is not quite as good as the <abbr>CIA</abbr>'s but the maps are more up to date.</li> +<li><a href="http://poisson.phc.unipi.it/~maggiolo/index.php/2014/01/how-much-is-time-wr…">How +much is time wrong around the world?</a> maps the difference between +mean solar and standard time, highlighting areas such as western China +where the two differ greatly.</li> </ul> <h2>Time zone boundaries</h2> <ul> -- 1.8.3.2

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