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Opposition to Cayman DST
by Paul Eggert Jan. 27, 2016

Jan. 27, 2016

Currently tzdata is guessing that Cayman will introduce daylight saving time this year. This is not official, though. There is opposition in the Legislative Assembly, and if the LA rejects it we will need to update tzdata. Ragoonath R. Gov’t Daylight Savings Time plans to get resistance in LA. Cayman Reporter 2016-01-08. http://www.caymanreporter.com/2016/01/08/govt-daylight-savings-time-plans-g…

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Re: [tz] Opposition to Cayman DST
by Steve Jones Jan. 27, 2016

Jan. 27, 2016

A complex area, timewise: http://OnTimeZone.com/images/caribbean.jpg (includes recent changes in Quinta Roo and the Turks and Caicos.) (magenta lines = time zone borders) (blue lines = dst observance borders) I wonder if the recent thaw in US/Cuban relations will have any tangential change in the economic relationship between the Caymans and Cuba. If so it might increase pressure to adopt DST. Steve Jones

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If you lie about the time zone, your iPhone will have its revenge
by Paul Eggert Jan. 22, 2016

Jan. 22, 2016

iPhone 6s and iPhone 6s Plus users are reporting that their phones are sometimes showing plenty of charge left even though their batteries are actually depleted, leaving some users stranded out of power. Apparently users who change their time (e.g., to gain unfair advantage in games like Candy Crush Saga) can confuse iOS 9.2 into not updating the battery percentage indicator. A similar problem can occur to users who set the time zone manually. One workaround is to reboot and revert to getting date and time from the network. Reference: Smith J. iPhone 6s battery bug leaves users longing for iOS 9.3. GottaBeMobile.com 2016-01-17. http://www.gottabemobile.com/2016/01/17/iphone-6s-battery-bug-leaves-users-…

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[PATCH 0/5] tzselect.ksh
by J William Piggott Jan. 20, 2016

Jan. 20, 2016

Hello, In the process of writing a tzselect style application which uses a dialog UI, I discovered some bugs and other issues with tzselect and the support files it uses (zone*.tab). I split the patches into two sets to address the issues. The second set is for the zone*.tab files and have a subject line like: [PATCH 1/3] zone*.tab: ... J William Piggott (5): tzselect.ksh: TZ validation bugs tzselect.ksh: regions list to inclusive tzselect.ksh: sort regions list tzselect.ksh: time scales assumed tzselect.ksh: add script mode option tzselect.ksh | 47 ++++++++++++++++++++++++++++++----------------- 1 file changed, 30 insertions(+), 17 deletions(-) ______________________________________ They are also available from my github account. Both patch sets are from the same branch. Here is the request-pull output: The following changes since commit 9e588f4c0bc2a1861c923aaa7760ebc7b024d885: Cite Ogle's 2015 book on history of civil time (2016-01-11 16:21:15 -0800) are available in the git repository at: git@github.com:jwpi/tz.git tzselect for you to fetch changes up to 2b16c464c2cb1c7a16297b861d9c060c151272bb: tzselect.ksh: add script mode option (2016-01-19 15:42:12 -0500) ---------------------------------------------------------------- J William Piggott (8): zone*.tab: make consistent 'most locations' zone*.tab: fix capitalization zone*.tab: fix Salta comment tzselect.ksh: TZ validation bugs tzselect.ksh: regions list to inclusive tzselect.ksh: sort regions list tzselect.ksh: time scales assumed tzselect.ksh: add script mode option tzselect.ksh | 47 ++++++++++++++++++++++++++++++----------------- zone.tab | 26 +++++++++++++------------- zone1970.tab | 32 ++++++++++++++++---------------- 3 files changed, 59 insertions(+), 46 deletions(-)

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Re: [tz] tzcode test suite
by Paul Eggert Jan. 18, 2016

Jan. 18, 2016

On 01/14/2016 10:18 AM, Steve Summit wrote: >> >* Would you mind if we changed "if(" to "if (" ... > Not at all. (Not my style, but I truly don't care.) OK, thanks, attached are a few followup patches. The first adjusts white space, the second fixes a glitch I introduced earlier. The test cases still fail, though. I wonder why they fail for me and not for you? Some more things I noticed. testsuite.c assumes time_t is equivalent to long, by using the %ld printf format to print it. That's not portable. time_t might have a different width from long, and time_t might be unsigned. zdump.c's tformat function gets it right. Adding 1900 to tm_year can overflow, if tm_year is close to INT_MAX. quick_timegm is full of gotchas like that. As it's not needed and is likely to have bugs in testing, how about if we remove it? This is in the 3rd attached patch. The remaining uses of isleap have a similar problem. It would be better to use isleap_sum; see tzfile.h.

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tz-art.htm: The Good Wife
by Arthur David Olson Jan. 18, 2016

Jan. 18, 2016

@dashdashado *** /tmp/,atz-art.htm 2016-01-17 22:55:53.832841200 -0500 --- /tmp/,btz-art.htm 2016-01-17 22:55:53.951096000 -0500 *************** *** 274,279 **** --- 274,288 ---- savings days. Lousy farmers."</td></tr> <tr><td> </td></tr> + <tr><td>TV episode title</td><td>Tracks</td></tr> + <tr><td>TV series</td><td>The Good Wife</td></tr> + <tr><td>TV episode number</td><td>12, season 7</td></tr> + <tr><td>Network</td><td>CBS</td></tr> + <tr><td>Air date</td><td>2016-01-17</td></tr> + <tr><td>Notes</td><td>The applicability of a contract hinges on the + time zone associated with a video time stamp.</td></tr> + <tr><td> </td></tr> + <tr><td>Artist</td><td>Jules Verne</td></tr> <tr><td>Book</td><td>Around the World in Eighty Days (Le tour du monde en quatre-vingts jours)</td></tr>

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tzcode test suite
by scs＠eskimo.com Jan. 16, 2016

Jan. 16, 2016

I've been doing some surgery on localtime.c (perhaps more on that later), and to check my work I felt the need for a decent gmtime/localtime/mktime test suite. I'm sure such a thing has been written numbers of times before, and there may be some reason not to have one in the tzcode distribution, but if not, I'd like to donate this one for inclusion. It runs in two modes, one driven by a script containing (in effect) a list of known-good (time_t, struct tm) pairs, and another which exhaustively runs a potentially very large set of synthesized tests over a specified range. The script contains lines such as gmtime 1234567890 2009-02-13 23:31:30 and tz America/New_York localtime 483811200 1985-05-01 12:00:00 z=EDT o=-14400 dst=1 which are used to drive reciprocal pairs of tests on gmtime/timegm or localtime/mktime, in a reasonably obvious way. A line like the first one tests both that gmtime(1234567890) gives 2009-02-13, and also that timegm on 2009-02-13 23:31:30 gives 1234567890. There are keywords for setting the expected output values for zone, offset, and DST flag (as shown). There are also additional keywords to set the expected values of tm_wday and tm_yday. (See the attached test script for more examples.) I'm also enclosing a patch to the tzcode Makefile to add a "make tests" target, building and appropriately invoking this tool. At the moment this tool tests only localtime, gmtime, mktime, and timegm. It would make sense to have coverage of ctime and strftime, too, which would be straightforward enough to add. Note that the zone names in the attached 'testcases' script match those built by the stock tzdata distribution, but not necessarily those installed on the machine where you may be trying to run this. See the long comment at the top of testsuite.c for additional information. Enjoy! Steve Summit scs(a)eskimo.com

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Bulletin C 51: No leap second in June 2016, but new leap second file
by Martin Burnicki Jan. 13, 2016

Jan. 13, 2016

The International Earth rotation Service (IERS) has just published bulletin C 51, announcing that *no* leap second will be introduced at the end of June 2016: ftp://hpiers.obspm.fr/iers/bul/bulc/bulletinc.dat The IERS now also makes a leap second file available for use with NTP: https://hpiers.obspm.fr/iers/bul/bulc/ntp/leap-seconds.list This new file has the expiration date set to 28 December 2016, so users who have configured ntpd to use the leap second file should upgrade their local copy of the file. The leap second file does not only announce leap seconds, it also provides ntpd and thus the OS kernel with the current TAI/UTC offset, which is helpful for applications working with TAI. Martin -- Martin Burnicki Senior Software Engineer MEINBERG Funkuhren GmbH & Co. KG Email: martin.burnicki(a)meinberg.de Phone: +49 (0)5281 9309-14 Fax: +49 (0)5281 9309-30 Lange Wand 9, 31812 Bad Pyrmont, Germany Amtsgericht Hannover 17HRA 100322 Geschäftsführer/Managing Directors: Günter Meinberg, Werner Meinberg, Andre Hartmann, Heiko Gerstung Web: http://www.meinberg.de

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[PROPOSED PATCH] Cite Ogle's 2015 book on history of civil time
by Paul Eggert Jan. 12, 2016

Jan. 12, 2016

* NEWS, Theory, asia: Mention Ogle's book, or reviews of it. --- NEWS | 3 +++ Theory | 10 +++++++++- asia | 9 +++++++++ 3 files changed, 21 insertions(+), 1 deletion(-) diff --git a/NEWS b/NEWS index f9de054..14a87ac 100644 --- a/NEWS +++ b/NEWS @@ -47,6 +47,9 @@ Unreleased, experimental changes on editing tz source files (with a mention of Sublime zoneinfo, thanks to Gilmore Davidson). + The Theory and asia files now mention the 2015 book "The Global + Transformation of Time, 1870-1950", and cite a couple of reviews. + The America/Chicago entry now documents the informal use of US central time in Fort Pierre, South Dakota. (Thanks to Rick McDermid, Matt Johnson, and Steve Jones.) diff --git a/Theory b/Theory index 96cba51..4f9c226 100644 --- a/Theory +++ b/Theory @@ -263,7 +263,15 @@ Errors in the tz database arise from many sources: be needed if the tz database's scope were extended to cover even just the known or guessed history of standard time; for example, the current single entry for France would need to split into dozens - of entries, perhaps hundreds. + of entries, perhaps hundreds. And in most of the world even this + approach would be misleading due to widespread disagreement or + indifference about what times should be observed. In her 2015 book + "The Global Transformation of Time, 1870-1950", Vanessa Ogle writes + "Outside of Europe and North America there was no system of time + zones at all, often not even a stable landscape of mean times, + prior to the middle decades of the twentieth century". See: + Timothy Shenk, Booked: A Global History of Time. Dissent 2015-12-17 + https://www.dissentmagazine.org/blog/booked-a-global-history-of-time-vaness… * Most of the pre-1970 data entries come from unreliable sources, often astrology books that lack citations and whose compilers evidently diff --git a/asia b/asia index 7756444..a59d653 100644 --- a/asia +++ b/asia @@ -874,6 +874,15 @@ Zone Asia/Dili 8:22:20 - LMT 1912 Jan 1 9:00 - TLT # India + +# From Ian P. Beacock, in "A brief history of (modern) time", The Atlantic +# http://www.theatlantic.com/technology/archive/2015/12/the-creation-of-moder… +# (2015-12-22): +# In January 1906, several thousand cotton-mill workers rioted on the +# outskirts of Bombay.... They were protesting the proposed abolition of +# local time in favor of Indian Standard Time.... Journalists called this +# dispute the "Battle of the Clocks." It lasted nearly half a century. + # Zone NAME GMTOFF RULES FORMAT [UNTIL] Zone Asia/Kolkata 5:53:28 - LMT 1880 # Kolkata 5:53:20 - HMT 1941 Oct # Howrah Mean Time? -- 2.5.0

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About Time Zone
by Chenshiwei (Yona) Jan. 7, 2016

Jan. 7, 2016

Hi, Dear IANA I met some problem in time zone data. >From the timeanddate.com, we know the time zone have some changes. [cid:image001.png@01D1488F.C9B0DEB0] But it seemed that iana.org did not update the time zone data about two months. [cid:image002.png@01D1488F.C9B0DEB0] So, I'd like to know if iana.org stop maintaining the time zone data. Could you give some suggestion about this.

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