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patch for leapseconds to incorporate IERS bulletin C44
by Robert Elz Nov. 27, 2012

Nov. 27, 2012

In accordance with the tradition of keeping a copy of the most recent IERS bulletin C (currently C 44) in the leapseconds file (as comments at the end), here's a patch that updates it from C43 to C44. kre --- leapseconds 2012-01-06 18:37:49.000000000 +0700 +++ leapseconds.C44 2012-11-27 19:05:37.000000000 +0700 @@ -58,36 +58,28 @@ # SERVICE DE LA ROTATION TERRESTRE # OBSERVATOIRE DE PARIS # 61, Av. de l'Observatoire 75014 PARIS (France) -# Tel. : 33 (0) 1 40 51 22 26 +# Tel. : 33 (0) 1 40 51 22 29 # FAX : 33 (0) 1 40 51 22 91 # e-mail : (E-Mail Removed) # http://hpiers.obspm.fr/eop-pc # -# Paris, 5 January 2012 +# Paris, 7 August 2012 # # -# Bulletin C 43 +# Bulletin C 44 # # To authorities responsible # for the measurement and # distribution of time # # -# UTC TIME STEP -# on the 1st of July 2012 +# INFORMATION ON UTC - TAI # +# NO leap second will be introduced at the end of December 2012. +# The difference between Coordinated Universal Time UTC and the +# International Atomic Time TAI is : # -# A positive leap second will be introduced at the end of June 2012. -# The sequence of dates of the UTC second markers will be: -# -# 2012 June 30, 23h 59m 59s -# 2012 June 30, 23h 59m 60s -# 2012 July 1, 0h 0m 0s -# -# The difference between UTC and the International Atomic Time TAI is: -# -# from 2009 January 1, 0h UTC, to 2012 July 1 0h UTC : UTC-TAI = - 34s -# from 2012 July 1, 0h UTC, until further notice : UTC-TAI = - 35s +# from 2012 July 1, 0h UTC, until further notice : UTC-TAI = -35 s # # Leap seconds can be introduced in UTC at the end of the months of December # or June, depending on the evolution of UT1-TAI. Bulletin C is mailed every

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Google moves beyond NTP
by Ted Cabeen Nov. 27, 2012

Nov. 27, 2012

Interesting article on how Google has moved beyond NTP, with a mention of last year's leap second: http://www.wired.com/wiredenterprise/2012/11/google-spanner-time/ --Ted

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Rerun of changes for Russia
by Arthur David Olson Nov. 26, 2012

Nov. 26, 2012

A second rerun, this time for the "europe" and "zone.tab" files to reflect Russian time zone changes in 2011. Again, provided both as an attachment and with tabs mangled below. Again, these have been adjusted to be relative to tz2012j. --ado *** tz2012j/europe 2012-11-09 20:49:36.000000000 -0500 --- tznew/europe 2012-11-25 16:21:23.538043000 -0500 *************** *** 2043,2048 **** --- 2043,2112 ---- # Russia + # From Alexander Krivenyshev (2011-09-15): + # Based on last Russian Government Decree # 725 on August 31, 2011 + # (Government document + # <a href="http://www.government.ru/gov/results/16355/print/"> + # http://www.government.ru/gov/results/16355/print/ + # </a> + # in Russian) + # there are few corrections have to be made for some Russian time zones... + # All updated Russian Time Zones were placed in table and translated to English + # by WorldTimeZone.com at the link below: + # <a href="http://www.worldtimezone.com/dst_news/dst_news_russia36.htm"> + # http://www.worldtimezone.com/dst_news/dst_news_russia36.htm + # </a> + + # From Sanjeev Gupta (2011-09-27): + # Scans of [Decree #23 of January 8, 1992] are available at: + # <a href="http://government.consultant.ru/page.aspx?1223966"> + # http://government.consultant.ru/page.aspx?1223966 + # They are in Cyrillic letters (presumably Russian). + + # From Arthur David Olson (2012-05-09): + # Regarding the instant when clocks in time-zone-shifting parts of Russia + # changed in September 2011: + # + # One source is + # < a href="http://government.ru/gov/results/16355/> + # http://government.ru/gov/results/16355/ + # </a> + # which, according to translate.google.com, begins "Decree of August 31, + # 2011 No 725" and contains no other dates or "effective date" information. + # + # Another source is + # <a href="http://www.rg.ru/2011/09/06/chas-zona-dok.html"> + # http://www.rg.ru/2011/09/06/chas-zona-dok.html + # </a> + # which, according to translate.google.com, begins "Resolution of the + # Government of the Russian Federation on August 31, 2011 N 725" and also + # contains "Date first official publication: September 6, 2011 Posted on: + # in the 'RG' - Federal Issue number 5573 September 6, 2011" but which + # does not contain any "effective date" information. + # + # Another source is + # <a href=" http://en.wikipedia.org/wiki/Oymyakonsky_District#cite_note-RuTime-7"> + # http://en.wikipedia.org/wiki/Oymyakonsky_District#cite_note-RuTime-7 + # </a> + # which, in note 8, contains "Resolution #725 of August 31, 2011... + # Effective as of after 7 days following the day of the official publication" + # but which does not contain any reference to September 6, 2011. + # + # The Wikipedia article refers to + # <a href=" http://base.consultant.ru/cons/cgi/online.cgi?req=doc;base=LAW;n=118896"> + # http://base.consultant.ru/cons/cgi/online.cgi?req=doc;base=LAW;n=118896 + # </a> + # which seems to copy the text of the government.ru page. + # + # Tobias Conradi combines Wikipedia's + # "as of after 7 days following the day of the official publication" + # with www.rg.ru's "Date of first official publication: September 6, 2011" to get + # September 13, 2011 as the cutover date (unusually, a Tuesday, as Tobias Conradi notes). + # + # None of the sources indicates a time of day for changing clocks. + # + # Go with 2011-09-13 0:00s. + # From Paul Eggert (2006-03-22): # Except for Moscow after 1919-07-01, I invented the time zone abbreviations. # Moscow time zone abbreviations after 1919-07-01, and Moscow rules after 1991, *************** *** 2270,2283 **** # [parts of] Respublika Sakha (Yakutiya). # From Oscar van Vlijmen (2009-11-29): ! # The Sakha districts are: Bulunskij, Verkhoyanskij, Tomponskij, Ust'-Majskij, ! # Ust'-Yanskij. Zone Asia/Vladivostok 8:47:44 - LMT 1922 Nov 15 9:00 - VLAT 1930 Jun 21 # Vladivostok Time 10:00 Russia VLA%sT 1991 Mar 31 2:00s 9:00 Russia VLA%sST 1992 Jan 19 2:00s 10:00 Russia VLA%sT 2011 Mar 27 2:00s 11:00 - VLAT # # Sakhalinskaya oblast'. # The Zone name should be Yuzhno-Sakhalinsk, but that's too long. --- 2334,2359 ---- # [parts of] Respublika Sakha (Yakutiya). # From Oscar van Vlijmen (2009-11-29): ! # The Sakha districts are: Bulunskij, Verkhoyanskij, ... Ust'-Yanskij. Zone Asia/Vladivostok 8:47:44 - LMT 1922 Nov 15 9:00 - VLAT 1930 Jun 21 # Vladivostok Time 10:00 Russia VLA%sT 1991 Mar 31 2:00s 9:00 Russia VLA%sST 1992 Jan 19 2:00s 10:00 Russia VLA%sT 2011 Mar 27 2:00s 11:00 - VLAT + + # From Arthur David Olson (2012-05-09): + # Tomponskij and Ust'-Majskij switched from Vladivostok time to Yakutsk time + # in 2011. + + Zone Asia/Khandyga 9:02:13 - LMT 1922 Nov 15 + 9:00 - VLAT 1930 Jun 21 # Vladivostok Time + 10:00 Russia VLA%sT 1991 Mar 31 2:00s + 9:00 Russia VLA%sST 1992 Jan 19 2:00s + 10:00 Russia VLA%sT 2011 Mar 27 2:00s + 11:00 - VLAT 2011 Sep 13 0:00s # Decree 725? + 10:00 - YAKT + # # Sakhalinskaya oblast'. # The Zone name should be Yuzhno-Sakhalinsk, but that's too long. *************** *** 2296,2309 **** # From Oscar van Vlijmen (2009-11-29): # The Sakha districts are: Abyjskij, Allaikhovskij, Verkhhhnekolymskij, Momskij, ! # Nizhnekolymskij, Ojmyakonskij, Srednekolymskij. Zone Asia/Magadan 10:03:12 - LMT 1924 May 2 10:00 - MAGT 1930 Jun 21 # Magadan Time 11:00 Russia MAG%sT 1991 Mar 31 2:00s 10:00 Russia MAG%sT 1992 Jan 19 2:00s 11:00 Russia MAG%sT 2011 Mar 27 2:00s 12:00 - MAGT ! # # From Oscar van Vlijmen (2001-08-25): [This region consists of] # Kamchatskaya oblast', Koryakskij avtonomnyj okrug. # --- 2372,2396 ---- # From Oscar van Vlijmen (2009-11-29): # The Sakha districts are: Abyjskij, Allaikhovskij, Verkhhhnekolymskij, Momskij, ! # Nizhnekolymskij, ... Srednekolymskij. Zone Asia/Magadan 10:03:12 - LMT 1924 May 2 10:00 - MAGT 1930 Jun 21 # Magadan Time 11:00 Russia MAG%sT 1991 Mar 31 2:00s 10:00 Russia MAG%sT 1992 Jan 19 2:00s 11:00 Russia MAG%sT 2011 Mar 27 2:00s 12:00 - MAGT ! ! # From Arthur David Olson (2012-05-09): ! # Ojmyakonskij and the Kuril Islands switched from ! # Magadan time to Vladivostok time in 2011 ! Zone Asia/Ust-Nera 9:32:54 - LMT 1924 May 2 ! 10:00 - MAGT 1930 Jun 21 # Magadan Time ! 11:00 Russia MAG%sT 1991 Mar 31 2:00s ! 10:00 Russia MAG%sT 1992 Jan 19 2:00s ! 11:00 Russia MAG%sT 2011 Mar 27 2:00s ! 12:00 - MAGT 2011 Sep 13 0:00s # Decree 725? ! 11:00 - VLAT ! # From Oscar van Vlijmen (2001-08-25): [This region consists of] # Kamchatskaya oblast', Koryakskij avtonomnyj okrug. # *** tz2012j/zone.tab 2012-07-18 20:30:38.000000000 -0400 --- tznew/zone.tab 2012-11-25 16:24:25.920299600 -0500 *************** *** 341,348 **** --- 341,350 ---- RU +5601+09250 Asia/Krasnoyarsk Moscow+04 - Yenisei River RU +5216+10420 Asia/Irkutsk Moscow+05 - Lake Baikal RU +6200+12940 Asia/Yakutsk Moscow+06 - Lena River + RU +623923+1353314 Asia/Khandyga Moscow+06 - Tomponsky, Ust-Maysky RU +4310+13156 Asia/Vladivostok Moscow+07 - Amur River RU +4658+14242 Asia/Sakhalin Moscow+07 - Sakhalin Island + RU +643337+1431336 Asia/Ust-Nera Moscow+07 - Oymyakonsky RU +5934+15048 Asia/Magadan Moscow+08 - Magadan RU +5301+15839 Asia/Kamchatka Moscow+08 - Kamchatka RU +6445+17729 Asia/Anadyr Moscow+08 - Bering Sea

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Not a rerun: tz-art.htm
by Arthur David Olson Nov. 25, 2012

Nov. 25, 2012

While it might not be a rerun, it's very important either: an addition to "tz-art.htm" to cover a "Da Vinci's Inquest" episode. As with the previous two, it's relative to tz2012j and appears both as an attachment and with tabs mangled below. --ado *** tz2012j/tz-art.htm 2012-07-18 22:23:31.000000000 -0400 --- tznew/tz-art.htm 2012-11-25 16:38:08.608479600 -0500 *************** *** 415,420 **** --- 415,427 ---- </a>. (Mark Brader, 2009-10-02) </li> <li> + In the "Run by the Monkeys" episode of "Da Vinci's Inquest" + (first broadcast 2002-11-17), + a witness in a five-year-old fire case realizes they may not have set + their clock back when daylight saving ended on the day of the fire, + introducing the possibility of an hour when arson might have occurred. + </li> + <li> In "The Todd Couple" episode of "Outsourced" (first aired 2011-02-10), Manmeet sets up teledates for 6:00 and 9:00; since one is with a New Yorker and the other with a San Franciscan,

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Rerun of proposed localtime.c changes
by Arthur David Olson Nov. 25, 2012

Nov. 25, 2012

Now that silly season seems to be over, two reruns. First, changes to localtime.c (both attached and below, with tabs mangled). These are designed to address two issues noted earlier this year by Doug Bailey: ensuring that "tzname" values are set, and getting proper behavior when the software is being run on an unsigned-time_t system but is using data files generated on a signed-time_t system. These changes have been updated to be relative to tz2012j. --ado *** tz2012j/localtime.c 2012-10-26 20:37:42.000000000 -0400 --- tznew/localtime.c 2012-11-25 16:11:23.833188100 -0500 *************** *** 271,276 **** --- 271,281 ---- /* ** And to get the latest zone names into tzname. . . */ + for (i = 0; i < sp->typecnt; ++i) { + register const struct ttinfo * const ttisp = &sp->ttis[i]; + + tzname[ttisp->tt_isdst] = &sp->chars[ttisp->tt_abbrind]; + } for (i = 0; i < sp->timecnt; ++i) { register const struct ttinfo * const ttisp = &sp->ttis[ *************** *** 479,498 **** ** signed time_t system but using a data file with ** unsigned values (or vice versa). */ ! for (i = 0; i < sp->timecnt - 2; ++i) ! if (sp->ats[i] > sp->ats[i + 1]) { ! ++i; if (TYPE_SIGNED(time_t)) { /* ** Ignore the end (easy). */ ! sp->timecnt = i; } else { /* ** Ignore the beginning (harder). */ register int j; for (j = 0; j + i < sp->timecnt; ++j) { sp->ats[j] = sp->ats[j + i]; sp->types[j] = sp->types[j + i]; --- 484,514 ---- ** signed time_t system but using a data file with ** unsigned values (or vice versa). */ ! for (i = 0; i < sp->timecnt; ++i) ! if ((i < sp->timecnt - 1 && ! sp->ats[i] > sp->ats[i + 1]) || ! (i == sp->timecnt - 1 && !TYPE_SIGNED(time_t) && ! sp->ats[i] > ! ((stored == 4) ? INT32_MAX : INT64_MAX))) { if (TYPE_SIGNED(time_t)) { /* ** Ignore the end (easy). */ ! sp->timecnt = i + 1; } else { /* ** Ignore the beginning (harder). */ register int j; + /* + ** Keep the record right before the + ** epoch boundary, + ** but tweak it so that it starts + ** right with the epoch + ** (thanks to Doug Bailey). + */ + sp->ats[i] = 0; for (j = 0; j + i < sp->timecnt; ++j) { sp->ats[j] = sp->ats[j + i]; sp->types[j] = sp->types[j + i];

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Make bug-reporting address more configurable
by Joseph S. Myers Nov. 13, 2012

Nov. 13, 2012

When distributing programs from tzcode as part of a larger software distribution, it can be desirable to redirect user bug reports to the bug-reporting system of that distribution as a whole (with a view to then passing along reports or fixes where it's determined that they don't relate to local modifications or packaging). This patch moves the bug-reporting address from being hardcoded in various strings to being in variables that are more convenient to modify in the packaging process. (Some people may wish to use an email address for bug reports, some a URL to a bug tracker and some a URL for instructions on bug reporting. But making the accompanying text configurable rather than just the address bit, to accommodate those variations better, would make things worse for i18n.) diff --git a/Makefile b/Makefile index 5a17164..cbda727 100644 --- a/Makefile +++ b/Makefile @@ -8,6 +8,9 @@ PACKAGE= tzcode # Version numbers of the code and data distributions. VERSION= 2012i +# Email address for bug reports. +BUGEMAIL= tz(a)iana.org + # Change the line below for your time zone (after finding the zone you want in # the time zone files, or adding it to a time zone file). # Alternately, if you discover you've got the wrong time zone, you can just @@ -344,7 +347,8 @@ INSTALL: ALL install date.1 version.h: (echo 'static char const PKGVERSION[]="($(PACKAGE)) ";' && \ - echo 'static char const TZVERSION[]="$(VERSION)";') >$@ + echo 'static char const TZVERSION[]="$(VERSION)";' && \ + echo 'static char const REPORT_BUGS_TO[]="$(BUGEMAIL)";') >$@ zdump: $(TZDOBJS) $(CC) -o $@ $(CFLAGS) $(LDFLAGS) $(TZDOBJS) $(LDLIBS) diff --git a/tzselect.ksh b/tzselect.ksh index 51bafc1..8e66b44 100644 --- a/tzselect.ksh +++ b/tzselect.ksh @@ -2,6 +2,7 @@ PKGVERSION='(tzcode) ' TZVERSION=see_Makefile +REPORT_BUGS_TO=tz(a)iana.org # Ask the user about the time zone, and output the resulting TZ value to stdout. # Interact with the user via stderr and stdin. @@ -44,7 +45,7 @@ if [ "$1" = "--help" ]; then Usage: tzselect Select a time zone interactively. -Report bugs to tz(a)iana.org. +Report bugs to $REPORT_BUGS_TO. EOF exit elif [ "$1" = "--version" ]; then diff --git a/zdump.c b/zdump.c index 626b09d..9255aff 100644 --- a/zdump.c +++ b/zdump.c @@ -272,8 +272,8 @@ usage(FILE * const stream, const int status) (void) fprintf(stream, _("%s: usage is %s [ --version ] [ --help ] [ -v ] [ -c [loyear,]hiyear ] zonename ...\n\ \n\ -Report bugs to tz(a)iana.org.\n"), - progname, progname); +Report bugs to %s.\n"), + progname, progname, REPORT_BUGS_TO); exit(status); } diff --git a/zic.c b/zic.c index 1964a89..a5202a1 100644 --- a/zic.c +++ b/zic.c @@ -426,8 +426,8 @@ usage(FILE *stream, int status) [ --version ] [ --help ] [ -v ] [ -l localtime ] [ -p posixrules ] \\\n\ \t[ -d directory ] [ -L leapseconds ] [ -y yearistype ] [ filename ... ]\n\ \n\ -Report bugs to tz(a)iana.org.\n"), - progname, progname); +Report bugs to %s.\n"), + progname, progname, REPORT_BUGS_TO); exit(status); } -- Joseph S. Myers joseph(a)codesourcery.com

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tzcode2012j and tzdata2012j available
by Paul Eggert Nov. 13, 2012

Nov. 13, 2012

The 2012j release of the tz code and data is available. It reflects the following changes recently circulated on the tz mailing list: Libya moved to CET this weekend, but with DST planned next year. (Thanks to Even Scharning, Steffen Thorsen, and Tim Parenti.) Signatures now have the extension .asc, not .sign, as that's more standard. (Thanks to Phil Pennock.) The output of 'zdump --version', and of 'zic --version', now uses a format that is more typical for --version. (Thanks to Joseph S. Myers.) The output of 'tzselect --help', 'zdump --help', and 'zic --help' now uses tz(a)iana.org rather than the old elsie address. zic -v now complains about abbreviations that are less than 3 or more than 6 characters, as per Posix. Formerly, it checked for abbreviations that were more than 3. 'make public' no longer puts its temporary directory under /tmp, and uses the just-built zic rather than the system zic. Various fixes to documentation and commentary. For this release I did not find the time to carefully review Joseph S. Myers's suggestion about BUGEMAIL in <http://mm.icann.org/pipermail/tz/2012-November/018452.html>. At first glance the suggestion seems like a good one, and I'd like to put it into the next release. Here are links to the release files: http://www.iana.org/time-zones/repository/releases/tzcode2012j.tar.gz http://www.iana.org/time-zones/repository/releases/tzdata2012j.tar.gz ftp://ftp.iana.org/tz/releases/tzcode2012j.tar.gz ftp://ftp.iana.org/tz/releases/tzdata2012j.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. 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 This release corresponds to commit dec96c09a2e3f735292a49929df29028d26c4f1c in the unofficial github repository at <https://github.com/eggert/tz>. Here are the GPG checksums for the release files: -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.11 (GNU/Linux) iQIcBAABAgAGBQJQobHpAAoJEO2X6Q5iqn40P8oQAIrQuNzzbLe6vcegbNAE1CME NwSqANNbsehf6vC6C/n5SLl6R329wFYZ4XXYSgzOVqKMW37IjULO+/xIxIeRdJ2h soFBd3G4AVM7bMlVPEwXe6rHeQ4x0KofejJIwT+B1gUrWCtaJ/3cse+0qwoGAi9t iahC/9h7ERNUy5S5ZJ228ZDrwq9vtLxtBLSZby7a/g11jUM+OVWwHrJAaj9d8PR/ zv0OKtZ1jhJdvcKgdnpdVMAC3Nvp+hNNae9UvLxtoTGn8WVG54zXaRVgBwAol7// WrZQHidJXPLg9mbvpNgFleMN5IJrOXh3P2kW0hr9LkeZFlNeuKWQ3YxjEvz0EKe2 0Oi30OYZlyfEFALMSvpuQ0LnxM7WSTkecrh4LbL3OZM2bzoC0TNqgFb1GX9hIc0h VV0StBUB9H0mGud4TA8WYzoX5oO7Obz+mogOZ754TKQ7aqAzWveEaQHSwjTBst6O VC7htCKT5pwUY0v+v9vp+as2qMplTMBMNDegSIYHEwyWVdHpZnRtBcGwd56exWCa MZiIhdZ9txmyCcxbAstZym/crvHpRxR1jabOShlRzuqFAuqOO0PkrdUUcPHGGY9P J1wJvDThZr6il/oR5/m6V+9OcKc4qDC9h8F8sKMq7xcmzQiTTscnvwmE6QQfDKlO PAN37ua5YwawD9kErq1z =tjIa -----END PGP SIGNATURE----- -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.11 (GNU/Linux) iQIcBAABAgAGBQJQobH2AAoJEO2X6Q5iqn40kBsP/j8AqTr5mkZDfqVFcoIvR4ej HChstB5X8RRgNyqk/89t5dwkVTSOmJ4f2kqhXnBRbq93I+KGT0STHZatYMPXkuKV pGWYkpdW1esyBrPT8ypqC3yWkBw3ZXoojT+CeeKifLLAyUGwoik9IfZz8DMtbm/s YdTP3Iv9sjwcybmGWLeRFq4htXOKtIzKAsTKJtfEjvdUBNgdl8McOsytUp3jMoPh /UNL2K3zIzBSX/keUXWnKv87ZWjmgBp0QpAZ+WecQcuLLyasTo8ktuT+7LCD/W8k jPq5itr3WP43tjvE6BA1mIyKdwBuYw6yhe1+acd/E6n3PJvxnLQYvER24v8B/4OQ dJtGEO2zzUZEfVYrfHeTdIu8gdE22MjrbhvB8rF1g8STRoNgligY0Owb7kGK9w0F ktX8z6JMVd2umca5mfkW2T9OH4Tr+EXYK1vSn1BOrUEcIJr2Li3XwZbs4s7fQgMT mfN97ce8+CapUmUN+D0Ce0aSlkU5IN27zZvORar3N8jKh3F8ls5Ge17M2tEPHRtW DWrRztFlRMwW0keHhna6+Q1+PzGxUAxGhWL7O73BddUD9gKo7nu9nbNc4cdeKul8 rRUctp5BEu4GpBqi7LLscLXEe0vZJWAgjX4FTfY17+MzFyKv0SfT3sDeuOiH8Ckb LihrCaAvM539PSqk3fWA =0LL/ -----END PGP SIGNATURE-----

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Re: [tz] tz Digest, Vol 14, Issue 10
by Andy McDonald Nov. 12, 2012

Nov. 12, 2012

On 12/11/2012 7:00 AM, tz-request(a)iana.org wrote: > Today's Topics: > > 1. [PATCH] Update documentation. (Paul Eggert) I thought it was too minor to mention, but since we're on the topic: FoxClocks now lives at http://foxclocks.org, and is available for Mozilla Firefox, Thunderbird and Google Chrome (Sunbird is no longer supported). It would be great if the documentation could reflect this. Andy

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[PATCH] Update documentation.
by Paul Eggert Nov. 12, 2012

Nov. 12, 2012

Here are some documentation updates I'd like to fold into the next release. * tz-link.htm: Prune no-longer-working URLs, update URLs that got moved, sort a bit. The most-important casualty is the Norwegian Meteorological Institute's web page for Summer time in Norway, formerly at <http://met.no/met/met_lex/q_u/sommertid.html>: it's no longer there and I can't find out where it moved to, if anywhere. * tzfile.5: Fix minor grammar problem. --- tz-link.htm | 173 +++++++++++++++++++++-------------------------------------- tzfile.5 | 2 +- 2 files changed, 63 insertions(+), 112 deletions(-) diff --git a/tz-link.htm b/tz-link.htm index 2690e1f..0d5d7da 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="2012-10-28"> +<meta name="DC.Date" content="2012-11-12"> <meta name="DC.Description" content="Sources of information about time zones and daylight saving time"> <meta name="DC.Identifier" @@ -101,11 +101,13 @@ gzip -dc tzdata-latest.tar.gz | tar -xf - </code></pre> <p> The code and data files can also be obtained from the -<a href="http://www.iana.org">IANA</a> -<a href="http://www.iana.org/time-zones">timezone web page</a>. +<a href="http://www.iana.org/time-zones">timezone web page</a> +of the <a href="http://www.iana.org">Internet Assigned Numbers +Authority (IANA)</a>. An <a href="https://github.com/eggert/tz">unofficial development repository</a> of the code and data is available -in <a href="http://git-scm.com/">Git</a> form; be careful, as this +in <a href="http://git-scm.com/">Git</a> form +from <a href="https://github.com/">GitHub</a>; be careful, as this repository is less well tested and probably contains more errors. <p> The code lets you compile the <code>tz</code> source files into @@ -118,30 +120,19 @@ send changes to the <a href="mailto:tz@iana.org">time zone mailing list</a>. You can also <a href="http://news.gmane.org/gmane.comp.time.tz">browse recent messages</a> sent to the mailing list, <a -href="https://mm.icann.org/mailman/listinfo/tz">subscribe</a> to it. -browse the <a +href="https://mm.icann.org/mailman/listinfo/tz">subscribe</a> to it, +and browse the <a href="http://mm.icann.org/pipermail/tz/">archive of old -messages</a> (message by message or in gzip compressed format), -or retrieve <a -href="ftp://ftp.iana.org/tz/releases/">archived older versions of code -and data</a>.</p> +messages</a>.</p> <p> The Web has several other sources for time zone and daylight saving time data. -Here are some recent links that may be of interest. +Here are some links that may be of interest. </p> <h2>Web pages using recent versions of the <code>tz</code> database</h2> <p> These are listed roughly in ascending order of complexity and fanciness. </p> <ul> -<li> -<a href="http://permatime.com"> -Permatime</a> -is a service for generating and viewing links that refer to a -particular point in time and can be displayed in multiple timezones. -It uses the ruby tzinfo gem. -(From Tim Diggins, 2009-11-03.) -</li> <li><a href="http://twiki.org/cgi-bin/xtra/tzdatepick.html">Date and Time Gateway</a> lets you see the <code>TZ</code> values directly.</li> <li><a @@ -151,10 +142,13 @@ Time in 1000 Places</a> uses descriptions of the values.</li> uses a pulldown menu.</li> <li><a href="http://home.tiscali.nl/~t876506/TZworld.html">Complete timezone information for all countries</a> displays tables of DST rules. -<li><a href="http://timeanddate.com/worldclock/">The World Clock - +<li><a href="http://timeanddate.com/worldclock/">The World Clock – Time Zones</a> lets you sort zone names and convert times.</li> -<li><a href="http://daylight-savings-time.info/">Graphical Display of -Time Zones and Daylight Saving Times</a> shows a graph of time +<li><a href="http://permatime.com/">Permatime</a> generates and views +links that refer to a particular point in time and can be displayed in +multiple timezones.</li> +<li><a href="http://daylight-savings-time.info/">Daylight Saving Time info</a> +shows a graph of time difference versus time for any pair of locations.</li> <li>The <a href="http://worldtimeengine.com/">World Time Engine</a> also contains data about time zone boundaries; it supports queries via place @@ -175,7 +169,7 @@ Calendaring and Scheduling Working Group (<abbr title="Calendaring and Scheduling Working Group">calsch</abbr>)</a> covers time zone data; see its VTIMEZONE calendar component. -The <a href="http://calconnect.org/">Calendaring and Scheduling +<a href="http://calconnect.org/">CalConnect, The Calendaring and Scheduling Consortium</a> is promoting further work in this area. <a href="http://calconnect.org/publications/icalendartimezoneproblemsandrecommendati…">iCalendar TIMEZONE Problems and Recommendations</a> offers guidelines and @@ -203,7 +197,7 @@ href="http://www.w3.org/2000/01/foo">schema</a> was sketched out.</li> </ul> <h2>Other <code>tz</code> compilers</h2> <ul> -<li><a href="http://www.dachaplin.dsl.pipex.com/vzic/">Vzic iCalendar +<li><a href="http://sourceforge.net/projects/vzic/">Vzic iCalendar Timezone Converter</a> describes a <a href="http://en.wikipedia.org/wiki/C_%28programming_language%29">C</a> program that compiles @@ -250,9 +244,9 @@ compiles <code>tz</code> source into It is freely available under the <abbr title="Massachusetts Institute of Technology">MIT</abbr> license.</li> <li>The <a href="http://chronos-st.org/">Chronos Date/Time -Library</a> is a <a href="http://smalltalk.org">Smalltalk</a> class -library that compiles <code>tz</code> source into a <a -href="http://date-time-zone.com/">time zone repository</a> whose format +Library</a> is +a <a href="http://en.wikipedia.org/wiki/Smalltalk">Smalltalk</a> class +library that compiles <code>tz</code> source into a time zone repository whose format is either proprietary or an <a href="http://www.w3.org/XML/"><abbr title="Extensible Markup Language">XML</abbr></a>-encoded representation.</li> @@ -294,7 +288,7 @@ Toolkit</a> applications like <a href="http://mozilla.com/firefox">Firefox</a>, <a href="http://mozilla.com/thunderbird">Thunderbird</a>, and <a -href="http://www.mozilla.org/projects/calendar/sunbird/">Sunbird</a>. +href="https://addons.mozilla.org/en-US/thunderbird/addon/lightning/">Lightning</a>. It displays multiple clocks in the application window, and has a mapping interface to <a href="http://earth.google.com/">Google Earth</a>. It is freely available under the <abbr>GPL</abbr>.</li> @@ -303,18 +297,17 @@ href="http://users.skynet.be/Peter.Verthez/projects/intclock/">International clock (intclock)</a> is a multi-timezone clock for <abbr>GNU</abbr>/Linux and similar systems. It is freely available under the <abbr>GPL</abbr>.</li> -<li><a href="http://codeplex.com/publicdomain">PublicDomain</a> -has a copy of a recent <code>tz</code> database, accessed via a <a -href="http://en.wikipedia.org/wiki/C_Sharp">C#</a> library. As its -name suggests, it is in the public domain. Only current time stamps -are well supported; historical data are compiled into the runtime but -are not easily accessible.</li> -<li><a href="http://java.sun.com/">Sun Java</a> releases since 1.4 +<li><a href="http://www.oracle.com/us/technologies/java/overview/index.html">Oracle +Java</a> releases since 1.4 contain a copy of a subset of a recent <code>tz</code> database in a Java-specific format.</li> <li><a href="http://kimmo.suominen.com/sw/timezone/">Time Zone</a> is a <a href="http://wordpress.org/">WordPress</a> plugin. It is freely available under a <abbr>BSD</abbr>-style license.</li> +<li><a href="http://www.relativedata.com/time-zone-master">Time Zone +Master</a> is a Microsoft Windows clock program that can automatically +download, compile and use the <code>tzdata<var>D</var>.tar.gz</code> +files as they are released. The Basic version is free.</li> <li><a href="http://veladg.com/velaterra.html">VelaTerra</a> is a Mac OS X program. Its developers @@ -323,36 +316,19 @@ licenses</a> to <code>tz</code> contributors.</li> <li><a href="http://worldtimeexplorer.com/">World Time Explorer</a> is a Microsoft Windows program.</li> -<li> -<a href="http://www.toriasoft.com"> -WorldClock for Windows and Windows Mobile</a> -lets users "see the time in up to 25 locations in the world at once." -(From Hans Nieuwenhuis, 2009-11-02.) -</li> -<li> -<a href="http://www.relativedata.com/time-zone-master"> -Time Zone Master Basic -</a> "allows people to display multiple desktop clocks, and to -research current and historical time information, as well as times of -astronomical events (sunrise/transit/set, moonrise/transit/set, phases, -season starts) for user-selected dates in the past and future. It can -automatically download, compile and use the tzdata**.gz database files -as they are released to keep the data up to date. The software is -free." (Davie Patte) -</li> </ul> <h2>Other time zone databases</h2> <ul> <li><a href="http://www.astro.com/cgi/aq.cgi">Atlas Query</a> -is Astrodienst's Web version of Shanks's -excellent time zone history atlases published in both <a -href="http://astrocom.com/products/software.php?software_id=ibmwboth">computer</a> +is Astrodienst's Web version of Shanks and Pottenger's +time zone history atlases published in both <a +href="http://astrocom.com/astrology-products/software/acs-atlas-software">computer</a> and book form (<a -href="http://astrocom.com/products/book.php?book_id=b110x">one volume +href="http://www.astrocom.com/astrology/books/american-atlas">one volume for the USA</a>, and <a -href="http://astrocom.com/products/book.php?book_id=b112x">one for +href="http://www.astrocom.com/astrology/books/international-atlas">one for other locations</a>) by <a -href="http://astrocom.com/">Astro Communications Services</a>.</li> +href="http://astrocom.com/">Astro Computing Services</a>.</li> <li><a href="http://worldtime.com/">WORLDTIME: interactive atlas, time info, public holidays</a> contains information on local time, sunrise and sunset, @@ -371,28 +347,17 @@ gives current time zone rules for airports served by commercial aviation.</li> <li>Some Microsoft Windows versions contain time zone information in an undocumented format, with IDs that can be mapped to <code>TZ</code> values using the <a -href="http://unicode.org/cldr/data/diff/supplemental/windows_tzid.html">Windows +href="http://unicode.org/repos/cldr-tmp/trunk/diff/supplemental/zone_tzid.html">Zone → Tzid table</a> maintained by the <abbr title="Common Locale Data Repository">CLDR</abbr> data mentioned below.</li> -<li> -<a href="http://code.google.com/p/tzdata/"> -http://code.google.com/p/tzdata/ -</a> -provides programming-language-specific representations of timezone -data. Currently this includes XML, PHP, Ruby, Javascript, JSON and CSV -formatted data. The repository is updated as soon as the FTP -distribution is updated. All data can be downloaded as a zip and/or it -can be obtained/synced via anonymous SVN. Data is made available under -the MIT license. (From Rich Tibbett.) -</li> </ul> <h2>Maps</h2> <ul> <li>The <a href="https://www.cia.gov/">United States Central Intelligence Agency (<abbr title="Central Intelligence Agency">CIA</abbr>)</a> publishes a <a -href="https://www.cia.gov/library/publications/the-world-factbook/reference_maps/…">time +href="https://www.cia.gov/library/publications/the-world-factbook/graphics/ref_ma…">time zone map</a>; the <a href="http://www.lib.utexas.edu/maps/world.html">Perry-Castañeda @@ -421,9 +386,8 @@ of Countries ("Statoids")</a> contains detailed lists of zone boundaries for multizone countries</a> summarizes legal boundaries between time zones within countries.</li> <li>Manifold.net's <a -href="http://www.manifold.net/download/freemaps.html">Free Maps and -<abbr title="Geographic Information Systems">GIS</abbr> -Data</a> includes a Manifold-format map of +href="http://manifold.net/info/freestuff.shtml">Free Stuff for +Manifold System Users</a> includes a Manifold-format map of world time zone boundaries distributed under the <abbr>GPL</abbr>.</li> <li>The <abbr>US</abbr> Geological Survey's National Atlas of @@ -453,15 +417,15 @@ Saving Time - History, rationale, laws & dates</a> is an overall history of <abbr>DST</abbr>.</li> <li><a href="http://energy.ca.gov/daylightsaving.html">Saving Time, Saving Energy</a> discusses a primary justification for <abbr>DST</abbr>.</li> -<li><a href="http://seizethedaylight.com/dst/">Who Knew? A Brief +<li><a href="http://seizethedaylight.com/dst/">A Brief History of Daylight Saving Time</a> summarizes some of the contentious history of <abbr>DST</abbr>.</li> -<li><a href="http://toi.iriti.cnr.it/">The +<li><a href="http://toi.inrim.it/uk/toi.html">The Time of Internet</a> describes time zones and daylight saving time, with diagrams. The time zone map is out of date, however.</li> -<li><a href="http://www.phys.uu.nl/~vgent/idl/idl.htm">A History of +<li><a href="http://www.staff.science.uu.nl/~gent0113/idl/idl.htm">A History of the International Date Line</a> tells the story of the most important time zone boundary.</li> <li><a href="http://statoids.com/tconcept.html">Basic Time @@ -471,7 +435,7 @@ Zone Concepts</a> discusses terminological issues behind time zones.</li> <dl> <dt>Australia</dt> <dd>The Parliamentary Library has commissioned <a -href="http://www.aph.gov.au/LIBRARY/Pubs/rn/2006-07/07rn13.pdf">research +href="http://www.aph.gov.au/binaries/library/pubs/rn/2006-07/07rn13.pdf">research note on daylight saving time in Australia</a>. The Bureau of Meteorology publishes a list of <a href="http://www.bom.gov.au/climate/averages/tables/dst_times.shtml">Implementation Dates of Daylight Savings Time within Australia</a>.</dd> @@ -485,17 +449,17 @@ records <a href="http://pcdsh01.on.br/DecHV.html" hreflang="pt-BR">Brazil's daylight saving time decrees (in Portuguese)</a>.</dd> <dt>Canada</dt> -<dd>The Institute for National Measurement Standards publishes current +<dd>National Research Council Canada publishes current and some older information about <a -href="http://inms-ienm.nrc-cnrc.gc.ca/time_services/daylight_saving_e.html">Time -Zones & Daylight Saving Time</a>.</dd> +href="http://www.nrc-cnrc.gc.ca/eng/services/time/time_zones.html">time +zones & daylight saving time</a>.</dd> <dt>Chile</dt> <dd>The Chilean Hydrographic and Oceanographic Service publishes a <a href="http://www.horaoficial.cl/horaof.htm" hreflang="es"> history of official time (in Spanish)</a>.</dd> <dt>Germany</dt> <dd>The National Institute for Science and Technology maintains the <a -href="http://www.ptb.de/en/org/4/44/441/dars_e.htm">Realisation of +href="http://www.ptb.de/cms/en/fachabteilungen/abt4/fb-44/ag-441/realisation-of-l…">Realisation of Legal Time in Germany</a>.</dd> <dt>Israel</dt> <dd>The Interior Ministry periodically issues <a @@ -509,20 +473,15 @@ hreflang="es">history of Mexican local time (in Spanish)</a>.</dd> <dt>Malaysia</dt> <dd>See Singapore below.</dd> <dt>Netherlands</dt> -<dd><a href="http://www.phys.uu.nl/~vgent/wettijd/wettijd.htm" +<dd><a href="http://www.staff.science.uu.nl/~gent0113/wettijd/wettijd.htm" hreflang="nl">Legal time in the Netherlands (in Dutch)</a> covers the history of local time in the Netherlands from ancient times.</dd> <dt>New Zealand</dt> -<dd>The Department of Internal Affairs maintains a brief history <a -href="http://dia.govt.nz/diawebsite.nsf/wpg_URL/Resource-material-Information-We-…">About +<dd>The Department of Internal Affairs maintains a brief <a +href="http://www.dia.govt.nz/Daylight-Saving-History">History of Daylight Saving</a>. The privately-maintained <a href="http://astrologyschool.com/nztime.html">History of New Zealand time</a> has more details.</dd> -<dt>Norway</dt> -<dd>The Norwegian Meteorological Institute lists -<a href="http://met.no/met/met_lex/q_u/sommertid.html" hreflang="no">Summer -time in Norway (in Norwegian)</a>, citing the -Institute of Theoretical Astrophysics, Oslo.</dd> <dt>Singapore</dt> <dd><a href="http://www.math.nus.edu.sg/aslaksen/teaching/timezone.html">Why @@ -530,11 +489,11 @@ is Singapore in the "Wrong" Time Zone?</a> details the history of legal time in Singapore and Malaysia.</dd> <dt>United Kingdom</dt> <dd><a -href="http://www.srcf.ucam.org/~jsm28/british-time/">History of +href="http://www.polyomino.org.uk/british-time/">History of legal time in Britain</a> discusses in detail the country with perhaps the best-documented history of clock adjustments. The National Physical Laboratory also maintains an <a -href="http://www.npl.co.uk/server.php?show=ConWebDoc.2714">Archive +href="http://www.npl.co.uk/educate-explore/what-is-the-time/archive-of-summer-tim…">Archive of Summer time dates</a>.</dd> </dl> <h2>Precision timekeeping</h2> @@ -553,7 +512,8 @@ href="ftp://ftp.rfc-editor.org/in-notes/rfc4833.txt">Timezone Options for <abbr title="Dynamic Host Configuration Protocol">DHCP</abbr></a> (Internet <abbr>RFC</abbr> 4833) specifies a <a -href="http://www.dhcp.org/">DHCP</a> option for a server to configure +href="http://en.wikipedia.org/wiki/Dynamic_Host_Configuration_Protocol">DHCP</a> +option for a server to configure a client's time zone and daylight saving settings automatically.</li> <li><a href="http://gauss.gge.unb.ca/GMT.UT.and.the.RGO.html">A Few Facts Concerning <abbr title="Greenwich Mean Time">GMT</abbr>, <abbr @@ -578,7 +538,7 @@ code for converting among time scales like <abbr title="International Atomic Time">TAI</abbr>, <abbr>TDB</abbr>, <abbr>TDT</abbr> and <abbr>UTC</abbr>.</li> -<li><a href="http://jpl.nasa.gov/basics/bsf2-3.htm">Basics of +<li><a href="http://www2.jpl.nasa.gov/basics/bsf2-3.php">Basics of Space Flight - Reference Systems - Time Conventions</a> briefly explains interplanetary space flight timekeeping.</li> <li><a @@ -593,13 +553,9 @@ dedicated not only to leap seconds but to precise time and frequency in general. It covers the state of the art in amateur timekeeping, and how the art has progressed over the past few decades.</li> <li><a -href="http://hpiers.obspm.fr/eop-pc/products/bulletins/bulletins.html">Bulletins -maintained by the -<abbr title="International Earth Rotation Service">IERS</abbr> -<abbr title="Earth Orientation Parameters">EOP</abbr> -(<abbr title="Product Center">PC</abbr>)</a> contains official publications of -the Earth Orientation Parameters Product Center of the -International Earth Rotation Service, the committee that decides +href="http://www.iers.org/IERS/EN/Publications/Bulletins/bulletins.html">IERS +Bulletins</a> contains official publications of the International +Earth Rotation and Reference Systems Service, which decides when leap seconds occur.</li> <li>The <a href="http://six.pairlist.net/mailman/listinfo/leapsecs">Leap @@ -609,11 +565,8 @@ and Klepczynski's proposal to discontinue leap seconds</a>, discussed further in <a href="http://www.cl.cam.ac.uk/~mgk25/time/metrologia-leapsecond.pdf">The leap second: its history and possible future</a>. -The (now disbanded) <a href="http://members.aas.org/comms/leap.cfm"><abbr -title="American Astronomical Society">AAS</abbr> Leap Second -Committee</a> has solicited input on this proposal. -<a href="http://www.ucolick.org/~sla/leapsecs/">The -Future of Leap Seconds</a> covers this +<a href="http://www.ucolick.org/~sla/leapsecs/">UTC might be redefined +without Leap Seconds</a> gives pointers on this contentious issue.</li> </ul> <h2>Time notation</h2> @@ -623,7 +576,7 @@ contentious issue.</li> the International Standard Date and Time Notation</a> is a good summary of <a -href="http://www.iso.org/iso/en/CatalogueDetailPage.CatalogueDetail?CSNUMBER=40874"><abbr +href="http://www.iso.org/iso/catalogue_detail?csnumber=40874"><abbr title="International Organization for Standardization">ISO</abbr> 8601:2004 -- Data elements and interchange formats -- Information interchange -- Representation of dates and times</a>.</li> @@ -658,8 +611,8 @@ abbreviations, identifiers, and formats. For example, it contains French translations for "Eastern European Summer Time", "<abbr title="Eastern European Summer Time">EEST</abbr>", and "Bucharest". <a -href="http://unicode.org/cldr/data/charts/by_type/names.metazone.html">By-Type -Chart: names.metazone</a> shows these values for many locales. +href="http://unicode.org/cldr/charts/by_type/index.html">By-Type +Chart</a> shows these values for many locales. <abbr>ICU</abbr> contains a mechanism for using this data.</li> <li>Alphabetic time zone abbreviations should not be used as unique identifiers for <abbr>UTC</abbr> offsets as they are ambiguous in @@ -693,8 +646,6 @@ is called "<abbr>GMT</abbr>".</li> <li><a href="tz-art.htm">Time and the Arts</a></li> <li><a href="http://www.dmoz.org/Reference/Time/">Open Directory - Reference: Time</a></li> -<li><a href="http://directory.google.com/Top/Reference/Time/">Google Directory -- Reference > Time</a></li> <li><a href="http://dir.yahoo.com/Science/Measurements_and_Units/Time">Yahoo! Directory > Science > Measurements and Units > Time</a></li> </ul> diff --git a/tzfile.5 b/tzfile.5 index aa7317b..10698a2 100644 --- a/tzfile.5 +++ b/tzfile.5 @@ -137,7 +137,7 @@ is zero or the time argument is less than the first transition time recorded in the file. .PP For version-2-format time zone files, -the above header and data is followed by a second header and data, +the above header and data are followed by a second header and data, identical in format except that eight bytes are used for each transition time or leap second time. After the second header and data comes a newline-enclosed, -- 1.7.9.5

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Libya one hour back last night
by Even Scharning Nov. 12, 2012

Nov. 12, 2012

Libya set their time one hour back at 02:00 on Saturday November 10. Sources: http://www.libyaherald.com/2012/11/04/clocks-to-go-back-an-hour-on-saturday/ http://twitter.com/ShoofLibya/status/265193706439733248/photo/1 "By the time everyone in Libya realizes the clocks are supposed to be set back 1 hour, it'll be time to set them forward again." https://twitter.com/Tripolitanian/status/267040258363899905 Sincerely, Even Scharning Time.is - exact time, any time zone http://time.is/

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