March 2015 - tz - lists.iana.org

Quick suggestion for "Sources for Time Zone and Daylight Saving Time Data"
by Brandon Ramsey March 25, 2015

March 25, 2015

Hey, I was poking around Pansearch.perl and came across your excellent resource: “Sources for Time Zone and Daylight Saving Time Data <http://cpansearch.perl.org/src/ZEFRAM/Time-OlsonTZ-Data-0.201402/tzsrc/tz-l…> ” I noticed that you referenced WorldTimeZone.com's Homepage on the page. I also love that resource! In fact, it was one resource that inspired me to create a more thorough and up to date version: http://www.thetimenow.com/ I’d be thrilled if you’d consider adding it to that page. If not, perhaps a recent or upcoming post is more appropriate :) Either way, keep up the great work you've been doing. Cheers, -- *Brandon Ramsay - Outreach Manager* *TheTimeNow.com* *the official current time of the world*

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[PROPOSED PATCH] * tz-link.htm, NEWS: Mention the TZUpdater tool.
by Paul Eggert March 24, 2015

March 24, 2015

--- NEWS | 4 ++++ tz-link.htm | 6 +++++- 2 files changed, 9 insertions(+), 1 deletion(-) diff --git a/NEWS b/NEWS index ddfd702..f31c6b1 100644 --- a/NEWS +++ b/NEWS @@ -10,6 +10,10 @@ Unreleased, experimental changes The zone's old contents have been moved to the 'backzone' file. The affected zone is America/Montreal. + Changes affecting commentary + + Mention the TZUpdater tool. + Release 2015b - 2015-03-19 23:28:11 -0700 diff --git a/tz-link.htm b/tz-link.htm index 092da5f..d1cf269 100644 --- a/tz-link.htm +++ b/tz-link.htm @@ -8,7 +8,7 @@ <meta http-equiv="Content-type" content='text/html; charset="UTF-8"'> <meta name="DC.Creator" content="Eggert, Paul"> <meta name="DC.Contributor" content="Olson, Arthur David"> -<meta name="DC.Date" content="2015-01-29"> +<meta name="DC.Date" content="2015-03-24"> <meta name="DC.Description" content="Sources of information about time zones and daylight saving time"> <meta name="DC.Identifier" @@ -282,6 +282,10 @@ and from <abbr title="Common Locale Data Repository">CLDR</abbr> data into an <abbr>ICU</abbr>-specific format. <abbr>ICU</abbr> is freely available under a <abbr>BSD</abbr>-style license.</li> +<li>The <a +href="http://www.oracle.com/technetwork/java/javase/tzupdater-readme-136440.html">TZUpdater +tool</a> compiles <code><abbr>tz</abbr></code> source into the format used by +Oracle Java.</li> <li><a href="http://www.joda.org/joda-time/">Joda-Time – Java date and time <abbr title="Application Program Interface">API</abbr></a> contains a class -- 2.1.0

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[PROPOSED PATCH] Move one out-of-scope zone to 'backzone'
by Paul Eggert March 24, 2015

March 24, 2015

* NEWS: Document this. * backzone (Mont, America/Montreal): Move this out-of-scope data here from 'northamerica'. * checktab.awk: Remove special case for America/Montreal, that was added to this file "temporarily" on 2013-09-11. * northamerica (America/Montreal): Now a link to America/Toronto. --- NEWS | 11 +++++++++++ backzone | 40 ++++++++++++++++++++++++++++++++++++++++ checktab.awk | 3 --- northamerica | 41 ++++------------------------------------- 4 files changed, 55 insertions(+), 40 deletions(-) diff --git a/NEWS b/NEWS index ce6ac40..ddfd702 100644 --- a/NEWS +++ b/NEWS @@ -1,5 +1,16 @@ News for the tz database +Unreleased, experimental changes + + Changes affecting past time stamps + + One more zone has been turned into a link, as it differed + from an existing zone only for older time stamps. As usual, + this change affects UTC offsets in pre-1970 time stamps only. + The zone's old contents have been moved to the 'backzone' file. + The affected zone is America/Montreal. + + Release 2015b - 2015-03-19 23:28:11 -0700 Changes affecting future time stamps diff --git a/backzone b/backzone index 31a3f5a..6b392bd 100644 --- a/backzone +++ b/backzone @@ -311,6 +311,46 @@ Zone America/Grenada -4:07:00 - LMT 1911 Jul # St George's Zone America/Guadeloupe -4:06:08 - LMT 1911 Jun 8 # Pointe-à-Pitre -4:00 - AST +# Canada +# +# From Paul Eggert (2015-03-24): +# Since 1970 most of Quebec has been like Toronto; see +# America/Toronto. However, earlier versions of the tz database +# mistakenly relied on data from Shanks & Pottenger saying that Quebec +# differed from Ontario after 1970, and the following rules and zone +# were created for most of Quebec from the incorrect Shanks & +# Pottenger data. The post-1970 entries have been corrected, but the +# pre-1970 entries are unchecked and probably have errors. +# +# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S +Rule Mont 1917 only - Mar 25 2:00 1:00 D +Rule Mont 1917 only - Apr 24 0:00 0 S +Rule Mont 1919 only - Mar 31 2:30 1:00 D +Rule Mont 1919 only - Oct 25 2:30 0 S +Rule Mont 1920 only - May 2 2:30 1:00 D +Rule Mont 1920 1922 - Oct Sun>=1 2:30 0 S +Rule Mont 1921 only - May 1 2:00 1:00 D +Rule Mont 1922 only - Apr 30 2:00 1:00 D +Rule Mont 1924 only - May 17 2:00 1:00 D +Rule Mont 1924 1926 - Sep lastSun 2:30 0 S +Rule Mont 1925 1926 - May Sun>=1 2:00 1:00 D +Rule Mont 1927 1937 - Apr lastSat 24:00 1:00 D +Rule Mont 1927 1937 - Sep lastSat 24:00 0 S +Rule Mont 1938 1940 - Apr lastSun 0:00 1:00 D +Rule Mont 1938 1939 - Sep lastSun 0:00 0 S +Rule Mont 1946 1973 - Apr lastSun 2:00 1:00 D +Rule Mont 1945 1948 - Sep lastSun 2:00 0 S +Rule Mont 1949 1950 - Oct lastSun 2:00 0 S +Rule Mont 1951 1956 - Sep lastSun 2:00 0 S +Rule Mont 1957 1973 - Oct lastSun 2:00 0 S +Zone America/Montreal -4:54:16 - LMT 1884 + -5:00 Mont E%sT 1918 + -5:00 Canada E%sT 1919 + -5:00 Mont E%sT 1942 Feb 9 2:00s + -5:00 Canada E%sT 1946 + -5:00 Mont E%sT 1974 + -5:00 Canada E%sT + # Montserrat # From Paul Eggert (2006-03-22): # In 1995 volcanic eruptions forced evacuation of Plymouth, the capital. diff --git a/checktab.awk b/checktab.awk index cf2c726..de98299 100644 --- a/checktab.awk +++ b/checktab.awk @@ -9,9 +9,6 @@ BEGIN { if (!zone_table) zone_table = "zone1970.tab" if (!want_warnings) want_warnings = -1 - # A special (and we hope temporary) case. - tztab["America/Montreal"] = 1 - while (getline <iso_table) { iso_NR++ if ($0 ~ /^#/) continue diff --git a/northamerica b/northamerica index 77463da..6b65d6d 100644 --- a/northamerica +++ b/northamerica @@ -1331,14 +1331,9 @@ Zone America/Moncton -4:19:08 - LMT 1883 Dec 9 # Quebec -# From Paul Eggert (2013-08-30): -# Since 1970 most of Quebec has been like Toronto. -# However, because earlier versions of the tz database mistakenly relied on data -# from Shanks & Pottenger saying that Quebec differed from Ontario after 1970, -# a separate entry was created for most of Quebec. We're loath to lose -# its pre-1970 info, even though the tz database is normally limited to -# zones that differ after 1970, so keep this otherwise out-of-scope entry. - +# From Paul Eggert (2015-03-24): +# See America/Toronto for most of Quebec, including Montreal. +# # Matthews and Vincent (1998) also write that Quebec east of the -63 # meridian is supposed to observe AST, but residents as far east as # Natashquan use EST/EDT, and residents east of Natashquan use AST. @@ -1352,39 +1347,10 @@ Zone America/Moncton -4:19:08 - LMT 1883 Dec 9 # For lack of better info, guess this practice began around 1970, contra to # Shanks & Pottenger who have this region observing AST/ADT. -# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S -Rule Mont 1917 only - Mar 25 2:00 1:00 D -Rule Mont 1917 only - Apr 24 0:00 0 S -Rule Mont 1919 only - Mar 31 2:30 1:00 D -Rule Mont 1919 only - Oct 25 2:30 0 S -Rule Mont 1920 only - May 2 2:30 1:00 D -Rule Mont 1920 1922 - Oct Sun>=1 2:30 0 S -Rule Mont 1921 only - May 1 2:00 1:00 D -Rule Mont 1922 only - Apr 30 2:00 1:00 D -Rule Mont 1924 only - May 17 2:00 1:00 D -Rule Mont 1924 1926 - Sep lastSun 2:30 0 S -Rule Mont 1925 1926 - May Sun>=1 2:00 1:00 D -Rule Mont 1927 1937 - Apr lastSat 24:00 1:00 D -Rule Mont 1927 1937 - Sep lastSat 24:00 0 S -Rule Mont 1938 1940 - Apr lastSun 0:00 1:00 D -Rule Mont 1938 1939 - Sep lastSun 0:00 0 S -Rule Mont 1946 1973 - Apr lastSun 2:00 1:00 D -Rule Mont 1945 1948 - Sep lastSun 2:00 0 S -Rule Mont 1949 1950 - Oct lastSun 2:00 0 S -Rule Mont 1951 1956 - Sep lastSun 2:00 0 S -Rule Mont 1957 1973 - Oct lastSun 2:00 0 S - # Zone NAME GMTOFF RULES FORMAT [UNTIL] Zone America/Blanc-Sablon -3:48:28 - LMT 1884 -4:00 Canada A%sT 1970 -4:00 - AST -Zone America/Montreal -4:54:16 - LMT 1884 - -5:00 Mont E%sT 1918 - -5:00 Canada E%sT 1919 - -5:00 Mont E%sT 1942 Feb 9 2:00s - -5:00 Canada E%sT 1946 - -5:00 Mont E%sT 1974 - -5:00 Canada E%sT # Ontario @@ -1596,6 +1562,7 @@ Zone America/Toronto -5:17:32 - LMT 1895 -5:00 Canada E%sT 1946 -5:00 Toronto E%sT 1974 -5:00 Canada E%sT +Link America/Toronto America/Montreal Zone America/Thunder_Bay -5:57:00 - LMT 1895 -6:00 - CST 1910 -5:00 - EST 1942 -- 2.1.0

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[PATCH] Modernize GCC_DEBUG_FLAGS
by Paul Eggert March 24, 2015

March 24, 2015

* Makefile (GCC_DEBUG_FLAGS): Assume GCC 4.9.2 and current tz sources. Add -Wdate-time, -Wdouble-promotion, -Wlogical-op, -Wold-style-definition, -Wunused. Remove redundant -Wcast-qual and -Wno-cast-qual. Remove -Wmissing-declarations; implied by -Wmissing-prototypes. Remove -Wmissing-noreturn; equivalent to -Wsuggest-attribute=noreturn. Remove -Wno-sign-conversion; not needed, as we don't use -Wconversion. Put the -Wno-* options last, so that they override preceding options that enable warnings. --- Makefile | 14 +++++++------- 1 file changed, 7 insertions(+), 7 deletions(-) diff --git a/Makefile b/Makefile index fbb027a..e7043af 100644 --- a/Makefile +++ b/Makefile @@ -149,18 +149,18 @@ LDLIBS= # $(GCC_DEBUG_FLAGS) if you are using GCC and want lots of checking GCC_DEBUG_FLAGS = -Dlint -g3 -O3 -fno-common -fstrict-aliasing \ -Wall -Wextra \ - -Wbad-function-cast -Wcast-align -Wcast-qual \ + -Wbad-function-cast -Wcast-align -Wdate-time \ -Wdeclaration-after-statement \ + -Wdouble-promotion \ -Wformat=2 -Winit-self -Wjump-misses-init \ - -Wmissing-declarations -Wmissing-noreturn -Wmissing-prototypes \ - -Wnested-externs -Wno-address -Wno-cast-qual \ - -Wno-format-nonliteral -Wno-sign-compare -Wno-sign-conversion \ - -Wno-type-limits \ - -Wno-unused-parameter -Woverlength-strings -Wpointer-arith \ + -Wlogical-op -Wmissing-prototypes -Wnested-externs \ + -Wold-style-definition -Woverlength-strings -Wpointer-arith \ -Wshadow -Wstrict-prototypes -Wsuggest-attribute=const \ -Wsuggest-attribute=format -Wsuggest-attribute=noreturn \ -Wsuggest-attribute=pure -Wtrampolines \ - -Wwrite-strings + -Wunused -Wwrite-strings \ + -Wno-address -Wno-format-nonliteral -Wno-sign-compare \ + -Wno-type-limits -Wno-unused-parameter # # If you want to use System V compatibility code, add # -DUSG_COMPAT -- 2.1.0

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Chile/EasterIsland 1982 broken by 2015a?
by Stuart Bishop March 23, 2015

March 23, 2015

My test suite broke with 2015a, leading me to Chile/EasterIsland and Pacific/Easter in 1982: Chile/EasterIsland Sun Oct 11 04:00:00 1981 UT = Sat Oct 10 22:00:00 1981 EASST isdst=1 gmtoff=-21600 Chile/EasterIsland Sat Mar 13 02:59:59 1982 UT = Fri Mar 12 20:59:59 1982 EASST isdst=1 gmtoff=-21600 Chile/EasterIsland Sat Mar 13 03:00:00 1982 UT = Fri Mar 12 22:00:00 1982 EASST isdst=1 gmtoff=-18000 Chile/EasterIsland Sun Mar 14 02:59:59 1982 UT = Sat Mar 13 21:59:59 1982 EASST isdst=1 gmtoff=-18000 Chile/EasterIsland Sun Mar 14 03:00:00 1982 UT = Sat Mar 13 21:00:00 1982 EAST isdst=0 gmtoff=-21600 Chile/EasterIsland Sun Oct 10 03:59:59 1982 UT = Sat Oct 9 21:59:59 1982 EAST isdst=0 gmtoff=-21600 Chile/EasterIsland Sun Oct 10 04:00:00 1982 UT = Sat Oct 9 23:00:00 1982 EASST isdst=1 gmtoff=-18000 Chile/EasterIsland Sun Mar 13 02:59:59 1983 UT = Sat Mar 12 21:59:59 1983 EASST isdst=1 gmtoff=-18000 Did it really put the clocks forward one hour on Mar 12, then back again Mar 13? -- Stuart Bishop <stuart(a)stuartbishop.net> http://www.stuartbishop.net/

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[tz-announce] 2015b release of tz code and data available
by Paul Eggert March 21, 2015

March 21, 2015

The 2015b 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 Mongolia will start observing DST again this year, from the last Saturday in March at 02:00 to the last Saturday in September at 00:00. (Thanks to Ganbold Tsagaankhuu.) Palestine will start DST on March 28, not March 27. Also, correct the fall 2014 transition from September 26 to October 24. Adjust future predictions accordingly. (Thanks to Steffen Thorsen.) Changes affecting past time stamps The 1982 zone shift in Pacific/Easter has been corrected, fixing a 2015a regression. (Thanks to Stuart Bishop for reporting the problem.) Some more zones have been turned into links, when they differed from existing zones only for older time stamps. As usual, these changes affect UTC offsets in pre-1970 time stamps only. Their old contents have been moved to the 'backzone' file. The affected zones are: America/Antigua, America/Cayman, Pacific/Midway, and Pacific/Saipan. Changes affecting time zone abbreviations Correct the 1992-2010 DST abbreviation in Volgograd from "MSK" to "MSD". (Thanks to Hank W.) Changes affecting code Fix integer overflow bug in reference 'mktime' implementation. (Problem reported by Jörg Richter.) Allow -Dtime_tz=time_t compilations, and allow -Dtime_tz=... libraries to be used in the same executable as standard-library time_t functions. (Problems reported by Bradley White.) Changes affecting commentary Cite the recent Mexican decree changing Quintana Roo's time zone. (Thanks to Carlos Raúl Perasso.) Likewise for the recent Chilean decree. (Thanks to Eduardo Romero Urra.) Update info about Mars time. Here are links to the release files: ftp://ftp.iana.org/tz/releases/tzcode2015b.tar.gz ftp://ftp.iana.org/tz/releases/tzdata2015b.tar.gz The files are also available via HTTP as follows: http://www.iana.org/time-zones/repository/releases/tzcode2015b.tar.gz http://www.iana.org/time-zones/repository/releases/tzdata2015b.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 2dc5d94148e3dbf7511f35edd99099705d8ce392 dated Thu Mar 19 23:28:11 2015 -0700 and tagged '2015b' in the experimental github repository at <https://github.com/eggert/tz>. Here are the SHA-512 checksums for the release files: d9b56c8ec98d9158d10cf80df0181864c467a4387b8ced5701f466c40885ea524bc1d49b0e17c0a18d8006a423da1c1b9a7e74626c4a916dd37cbb85e04b2b0a tzcode2015b.tar.gz 767782b87e62a8f7a4dbcae595d16a54197c9e04ca974d7016d11f90ebaf2537b804d111f204af9052c68d4670afe0af0af9e5b150867a357fc199bb541368d0 tzdata2015b.tar.gz Here are the GPG checksums for the release files: -----BEGIN PGP SIGNATURE----- Version: GnuPG v1 iQIcBAABAgAGBQJVC76nAAoJEO2X6Q5iqn4058QP/3wSOsQJm7PCVcVM4803N0QW FSYuqkvPldmhTOti7cHprsFL/SigOOwJdrYusI5nTlQMeCEpUYLnmdqm3GWyrlAj +9exuMpfePqsrcKK2wW6/a4w9u+1vGZagl4fnpsCdw9KoWuoE+B4P+DH0iHBXJIV bizOSiDs+dg0Ap5BhKzCvawCmDviFaO+666OrxNonREvRbokPptNXdDjkcKZiJNC zFrqtbhgb4X7yFuoj78V39TzoTzyh2jV00cJByYp/osFVi8c17U3Y7SdsgQ63/+3 BDDPJAXc+dtJCWIkg7+5syJNZkPtFkzhIxy1Zz3QTIapr2McAD7/ngvDnczgPCW2 JZEQ0SwMIzYNgjwGuCOiQR0JcoyKkux5G5UwFGsXTopsQDRFd0/8YM33VPv/Mkqs pemElTklzbUNIwWMm+8XzkG04HaYgdy3SEs/ZqzLcRZU6fR/qSz2qxlOrPN0NZzl 2lFx08MCL6vGXe+iMgAjiJBbx6jfK6QW8mxjBpEXSPqpC7dWNlWk8r4XNi1ndsW1 1mS/F+fxV6cAkeHkNIV6ZA4nbeAGxDZViPUIxXBvSh8/NUO2CLf1HFybMSFNPu31 6Mu8QlHwq8gwMVAe2LCALHpmHump+64pdqV8FMr75DkQjQBU/kGHm161h3lEB0jS lrg+YZMC4pQ4znrvoZAX =dICV -----END PGP SIGNATURE----- -----BEGIN PGP SIGNATURE----- Version: GnuPG v1 iQIcBAABAgAGBQJVC76nAAoJEO2X6Q5iqn40dXQQAIAMoFGd7MkZmrNEI3ZNl3lI tSLIge1yZv2q7ZzYsNwrEFaqBY/TOo0Zj8JOEWrpzDE6uc4tLXIa7S39xSvuCKAx LckxD8vDsxmIofL+KGt3YRxVmg9c3DDv7fVhDENqm1dj+VTGgDZCEztgAoXAcWvw h/JPJu6PS75+0RPGaHBRgjs+rWDuE5o2DtpexkXhkkca4krwyhLM1uXH6x+uXEd9 QyDPduJnUE+4dxOo0M0Au8HcBZ6u5zWm26ovpK9jLlMeVTvkac4RAr5jcTf0UdHJ 11VEFPCdPxnlwZD4iwFfUP3QdE9i8jGNrEqddzi4fvw2SAgDxB8Mz8C3TQp5vA3O bkzI1XMr0P1gut8PbhhxBHKQWduas9Y28RiGrnWNRxFekrJmFzwleUomveP9m+Dj +nVwe5F4ny96ht83IS5NOxroYRxK+jAi1/7d/nmPltHOAF88ai14Ogs21u1XfbOJ NcfbLRkVKCyjyVqsT7ZoHJVb9xLj3kphcwdI0XQBnqNxkiFUjQzY3uABhLsKhXNW 4PVuF+5+b1on/Ew2/re6dI2hbRFG8vwJeCPK+Oqn6TGfxT8v86OPc6jT7w5Mr6vt ZbYofuF/CiZJlgeB6I3qvGYcUsnhrxSQJWKpt9iS5Aq2wpRKYaYRU43igfuE3Znl dpFoxJMOxF7fw67+8ZSi =clrh -----END PGP SIGNATURE----- _______________________________________________ tz-announce mailing list tz-announce(a)iana.org https://mm.icann.org/mailman/listinfo/tz-announce

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DST in the news
by Arthur David Olson March 12, 2015

March 12, 2015

A Washington Post on-line recap by Elahe Izadi of efforts to change time in twelve of the United States: http://www.washingtonpost.com/blogs/the-fix/wp/2015/03/12/a-bunch-of-states… @dashdashado

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Fwd: Re: [english 83%] Re: historic Oslo times
by Meno Hochschild March 11, 2015

March 11, 2015

Okay, now I have done my own investigations and found following answer: If the switch (expressed as UNTIL-time in a ZONE-line) is before any dst-rule valid for given UNTIL-related year then we have to apply the previous daylight saving offset valid at that time (previous means before the switch). The southern hemisphere matters here, see America/Argentina/Jujuy in 1992. However, there is one exception. If there are no dst-rules at all in given year then we have to apply zero-offset (consistent with Asia/Gaza for the 1967 switch). I wished these tricky details were documented anywhere and I hope it helps for anyone else. -------- Weitergeleitete Nachricht -------- Betreff: Re: [english 83%] Re: [tz] historic Oslo times Datum: Sat, 07 Mar 2015 01:49:07 +0100 Von: Meno Hochschild <mhochschild(a)gmx.de> An: Paul Eggert <eggert(a)cs.ucla.edu> Thank you very much for clarification. Is this rule/algorithm/procedure documented anywhere? So for Oslo we have a rule BEFORE the switch which gives us the dst-offset of +01:00 to be applied. And what will happen if the rule in question taking effect happens AFTER the time of switch (as expressed in UNTIL-term) meaning: for given year there is no rule before switch? Is it okay to assume daylight-savings zero in this edge case? ls this assumption also valid for southern hemisphere? Am 06.03.2015 um 22:29 schrieb Paul Eggert: > Meno Hochschild wrote: >> The rule for 1940 cannot be applied because 1st of Apr is clearly >> before the >> UNTIL-date of zone line in question when changing from Norway-rule to >> C-Eur-rule. > > When a zone switches from one set of rules to another, the rule in > effect at the time of the switch is the rule that governs, even if > this rule first took effect before the switch. So the rule you > mention can be applied, and the data for Europe/Oslo should be OK. > You can verify this by running the command "zdump -v Europe/Oslo" and > verifying that all the transitions are as expected. Here are the > war-year transitions that I observed that way: > > Sat Aug 10 21:59:59 1940 UT = Sat Aug 10 22:59:59 1940 CET isdst=0 > gmtoff=3600 > Sat Aug 10 22:00:00 1940 UT = Sun Aug 11 00:00:00 1940 CEST isdst=1 > gmtoff=7200 > Mon Nov 2 00:59:59 1942 UT = Mon Nov 2 02:59:59 1942 CEST isdst=1 > gmtoff=7200 > Mon Nov 2 01:00:00 1942 UT = Mon Nov 2 02:00:00 1942 CET isdst=0 > gmtoff=3600 > Mon Mar 29 00:59:59 1943 UT = Mon Mar 29 01:59:59 1943 CET isdst=0 > gmtoff=3600 > Mon Mar 29 01:00:00 1943 UT = Mon Mar 29 03:00:00 1943 CEST isdst=1 > gmtoff=7200 > Mon Oct 4 00:59:59 1943 UT = Mon Oct 4 02:59:59 1943 CEST isdst=1 > gmtoff=7200 > Mon Oct 4 01:00:00 1943 UT = Mon Oct 4 02:00:00 1943 CET isdst=0 > gmtoff=3600 > Mon Apr 3 00:59:59 1944 UT = Mon Apr 3 01:59:59 1944 CET isdst=0 > gmtoff=3600 > Mon Apr 3 01:00:00 1944 UT = Mon Apr 3 03:00:00 1944 CEST isdst=1 > gmtoff=7200 > Mon Oct 2 00:59:59 1944 UT = Mon Oct 2 02:59:59 1944 CEST isdst=1 > gmtoff=7200 > Mon Oct 2 01:00:00 1944 UT = Mon Oct 2 02:00:00 1944 CET isdst=0 > gmtoff=3600 > Mon Apr 2 00:59:59 1945 UT = Mon Apr 2 01:59:59 1945 CET isdst=0 > gmtoff=3600 > Mon Apr 2 01:00:00 1945 UT = Mon Apr 2 03:00:00 1945 CEST isdst=1 > gmtoff=7200 > Mon Oct 1 00:59:59 1945 UT = Mon Oct 1 02:59:59 1945 CEST isdst=1 > gmtoff=7200 > Mon Oct 1 01:00:00 1945 UT = Mon Oct 1 02:00:00 1945 CET isdst=0 > gmtoff=3600 > >

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[PROPOSED PATCH 1/2] Support -Dtime_tz=time_t
by Paul Eggert March 11, 2015

March 11, 2015

* private.h (tz_time_t), NEWS: Move typedef earlier. (Problem reported by Bradley White.) --- NEWS | 2 ++ private.h | 4 ++-- 2 files changed, 4 insertions(+), 2 deletions(-) diff --git a/NEWS b/NEWS index 1e74bfd..89b5349 100644 --- a/NEWS +++ b/NEWS @@ -34,6 +34,8 @@ Unreleased, experimental changes Fix integer overflow bug in reference 'mktime' implementation. (Problem reported by Jörg Richter.) + Allow -Dtime_tz=time_t compilations. (Problem reported by Bradley White.) + Changes affecting commentary Cite the recent Mexican decree changing Quintana Roo's time zone. diff --git a/private.h b/private.h index efa1bdf..b9429ae 100644 --- a/private.h +++ b/private.h @@ -308,6 +308,8 @@ typedef unsigned long uintmax_t; static time_t sys_time(time_t *x) { return time(x); } # endif +typedef time_tz tz_time_t; + # undef ctime # define ctime tz_ctime # undef ctime_r @@ -341,8 +343,6 @@ static time_t sys_time(time_t *x) { return time(x); } # undef timeoff # define timeoff tz_timeoff -typedef time_tz time_t; - char *ctime(time_t const *); char *ctime_r(time_t const *, char *); double difftime(time_t, time_t); -- 2.1.0

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signed overflow
by Richter, Jörg March 10, 2015

March 10, 2015

In time2sub() there is this code: } else { lo = 1; for (i = 0; i < (int) TYPE_BIT(time_t) - 1; ++i) lo *= 2; hi = -(lo + 1); } The last *= 2 will overflow a signed integer time_t. This can be fixed with “lo = -1” instead of “lo = 1”. This change seems to be consistent with the variable names. - Jörg

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