January 2016 - tz - lists.iana.org

[tz-announce] 2016a release of tz code and data available
by Paul Eggert Jan. 28, 2016

Jan. 28, 2016

The 2016a release of the tz code and data is available. It reflects the following changes, which were either circulated on the tz mailing list or are relatively minor technical or administrative changes: Changes affecting future time stamps America/Cayman will not observe daylight saving this year after all. Revert our guess that it would. (Thanks to Matt Johnson.) Asia/Chita switches from +0800 to +0900 on 2016-03-27 at 02:00. (Thanks to Alexander Krivenyshev.) Asia/Tehran now has DST predictions for the year 2038 and later, to be March 21 00:00 to September 21 00:00. This is likely better than predicting no DST, albeit off by a day every now and then. Changes affecting past and future time stamps America/Metlakatla switched from PST all year to AKST/AKDT on 2015-11-01 at 02:00. (Thanks to Steffen Thorsen.) America/Santa_Isabel has been removed, and replaced with a backward compatibility link to America/Tijuana. Its contents were apparently based on a misreading of Mexican legislation. Changes affecting past time stamps Asia/Karachi's two transition times in 2002 were off by a minute. (Thanks to Matt Johnson.) Changes affecting build procedure An installer can now combine leap seconds with use of the backzone file, e.g., with 'make PACKRATDATA=backzone REDO=posix_right zones'. The old 'make posix_packrat' rule is now marked as obsolescent. (Thanks to Ian Abbott for an initial implementation.) Changes affecting documentation and commentary A new file LICENSE makes it easier to see that the code and data are mostly public-domain. (Thanks to James Knight.) The three non-public-domain files now use the current (3-clause) BSD license instead of older versions of that license. tz-link.htm mentions the BDE library (thanks to Andrew Paprocki), CCTZ (thanks to Tim Parenti), TimeJones.com, and has a new section 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.) Here are links to the release files: ftp://ftp.iana.org/tz/releases/tzcode2016a.tar.gz ftp://ftp.iana.org/tz/releases/tzdata2016a.tar.gz The files are also available via HTTP as follows: http://www.iana.org/time-zones/repository/releases/tzcode2016a.tar.gz http://www.iana.org/time-zones/repository/releases/tzdata2016a.tar.gz As usual, links to the latest release files are here: http://www.iana.org/time-zones/repository/tzcode-latest.tar.gz http://www.iana.org/time-zones/repository/tzdata-latest.tar.gz ftp://ftp.iana.org/tz/tzcode-latest.tar.gz ftp://ftp.iana.org/tz/tzdata-latest.tar.gz Each release file has a GPG signature, which can be retrieved by appending ".asc" to the above URLs. Copies of these signatures are appended to this message. This release corresponds to commit 0f03a534155f590681e45ad8a3202a4412a8ba80 dated Tue Jan 26 23:28:02 2016 -0800 and tagged '2016a' in the experimental github repository at <https://github.com/eggert/tz>. Here are the SHA-512 checksums for the release files: 33a1078ba16aef19048aa97ce1816fc5368061bfe40eddc0e7e246ca57c4a535eaf2f03847128e971a6d959f34ea77224bf33fd53dc6a0c006450dde35222223 tzcode2016a.tar.gz 9aa5f61a73afa5070dfb1d1982945d268ea8215663d0cd594216500aff14797ea5591ccfd488dc2280902fa1820bf782623624912b669873728431258fe10ec1 tzdata2016a.tar.gz Here are the GPG checksums for the release files: -----BEGIN PGP SIGNATURE----- Version: GnuPG v1 iQIcBAABAgAGBQJWqHJCAAoJEO2X6Q5iqn40vggP/iUDh0UDG3g9lQfV41yXx+Dg 4Ln+RVSEkfKE82ffPSJzvyRQzp1l/U2alopcI+Ernou7hmcrYYcJC827QZ+boiLv uK5/LIDqI/uBb6j3bxt2aiymsbL1+q4C3RDypujKa4lh0kuinO6MUTpnIEGmNdAl l0q6pWyJfH4UYxT8UCjCvJrNQwMxCD+31oz4blUMUr3h/TdAfd/uRs0xm06Fi6ss HSzJ1P2gej4uTdGzuWczbZrCdkpLvZXhYt/kIQ3tOl+9bAJOJa0/3zVuIxUO6DNL w4RRaHbdtvtDUw7vqGcIe2nZHZ4GdRfHINi2sflHfH6auq53x6mWiOGbDqAMQkk4 2HFnHr8sawB+6TA8vSgayOKg+Ja2eX/4IXBqrGBzt96a0AfJDgWlulgA5oc6lQvy BAYtgXYfUTg05EEZOIvL1kDR3CZJB2v6U72DVT8y6Bs52w1ue1/7HfhY9N5hHor5 nCeaeqoQLopMdfpMn3pATqRXvTFsxmlDaN8Y2S6IZyvQgPqpPGBdaH0i+Ran5bXf vKCRpxS6rsSvOdliNCnr2hytk5UrRdxuLJ6yWiUjhVBszGISUR15w2iwK26NifIR ZbMV4e2bcZl7kGcq+dIeTtjAoXeP+Bh3Y3NfIq37O1NK8gsx31GfGMVifJYxE4ti qtlircuZtjdkQR0GmACZ =cUhj -----END PGP SIGNATURE----- -----BEGIN PGP SIGNATURE----- Version: GnuPG v1 iQIcBAABAgAGBQJWqHJHAAoJEO2X6Q5iqn40O/QP/0dWxkvnViAXibpFmZeQF9qC 18S3oL35D9CwWdIo60zmQ1K4lzq7k3K4fCs+VAZnlp8DeqxbnX/utfFsxRGBZu9F fHYeIyxPB+Gm45SE3USefZgD38LDDmEIkeQ+SE3geDSVKMO/gHGk55jl/8vylm1d bIdU/1PNSr5EZt2LlXuRRO1lnQ6cW1G5vDtGj4nyB++/FDIi4qsBMQy21qqRs2K3 vcw3yRQbqz7rEUxG/k0d9KU/dRUY980f4pHx2kkYpRKL2nhLeYqH3jfRUhOgwupS Yp4fVFF1gZWbxjcf8Xb97jpCW0q4TL4wPYFQNOsLJJGtNeRP1Pgz7FsjH1qwSUy2 blX1UWhtFAjUnHF+XO7Z5DUexoq1+14OFWSGwxuGpwUNxgtMmRr4KZVuKg9ag7jC hKoegozcf90lZ+PmuAXNbz1S9DcILRFG7qnV+E3oKPjyOQBnU1z7Mx0rtleT14iQ Pdi0ygv4/9cs07dOsF3oqRfwqldYogYF0/O3559eQzGfKdxOIu0eLZV9PLaCnAoM 2zpnPOBqBIwUHRynd6EBJyeu1WCRoC/oIvEs8A8QINf6EN/Fu/Xxgmf8HwwRIOE+ xgJeNE4Z4xjWiCmu7dvBZJIZZi7dmWaHwste+WxUMZ0boDsYOmnkGCclpSb+MzpX 49a9DUdrNMurifgNd4vy =WafQ -----END PGP SIGNATURE----- _______________________________________________ tz-announce mailing list tz-announce(a)iana.org https://mm.icann.org/mailman/listinfo/tz-announce

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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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