August 2014 - tz - lists.iana.org

[PROPOSED PATCH 1/5] Port to platforms with leap seconds and unsigned time_t.
by Paul Eggert Aug. 19, 2014

Aug. 19, 2014

* localtime.c (tzload): On platforms where time_t is unsigned, don't mishandle zones that contain leap seconds but no ordinary transitions after 1970. This problem can be reproduced by running 'zdump -v right/Asia/Dubai' on a platform where time_t is an unsigned 32-bit integer. --- localtime.c | 28 ++++++++++++++-------------- 1 file changed, 14 insertions(+), 14 deletions(-) diff --git a/localtime.c b/localtime.c index 8a66650..a1e6601 100644 --- a/localtime.c +++ b/localtime.c @@ -395,28 +395,28 @@ tzload(register const char *name, register struct state *const sp, ttisstdcnt + /* ttisstds */ ttisgmtcnt) /* ttisgmts */ goto oops; + + /* Read transitions, discarding those out of time_t range. + But pretend the last transition before time_t_min + occurred at time_t_min. */ timecnt = 0; for (i = 0; i < sp->timecnt; ++i) { int_fast64_t at = stored == 4 ? detzcode(p) : detzcode64(p); - sp->types[i] = ((TYPE_SIGNED(time_t) - ? time_t_min <= at - : 0 <= at) - && at <= time_t_max); + sp->types[i] = at <= time_t_max; if (sp->types[i]) { - if (i && !timecnt && at != time_t_min) { - /* - ** Keep the earlier record, but tweak - ** it so that it starts with the - ** minimum time_t value. - */ - sp->types[i - 1] = 1; - sp->ats[timecnt++] = time_t_min; - } - sp->ats[timecnt++] = at; + time_t attime + = ((TYPE_SIGNED(time_t) ? at < time_t_min : at < 0) + ? time_t_min : at); + if (timecnt && sp->ats[timecnt - 1] == attime) { + sp->types[i - 1] = 0; + timecnt--; + } + sp->ats[timecnt++] = attime; } p += stored; } + timecnt = 0; for (i = 0; i < sp->timecnt; ++i) { unsigned char typ = *p++; -- 1.9.1

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Re: [tz] [PROPOSED PATCH] * northamerica (TC, America/Grand_Turk): Switch from EST/EDT to AST.
by Matt Johnson Aug. 19, 2014

Aug. 19, 2014

Typo. I think you mean "UTC-4 year round". Not +4. Sent from my Windows Phone ________________________________ From: Paul Eggert<mailto:eggert@cs.ucla.edu> Sent: ‎8/‎19/‎2014 1:15 AM To: tz(a)iana.org<mailto:tz@iana.org> Subject: [tz] [PROPOSED PATCH] * northamerica (TC, America/Grand_Turk): Switch from EST/EDT to AST. * NEWS: Document this. --- NEWS | 5 +++++ northamerica | 12 +++++++++--- 2 files changed, 14 insertions(+), 3 deletions(-) diff --git a/NEWS b/NEWS index 1a78041..6fb00b0 100644 --- a/NEWS +++ b/NEWS @@ -2,6 +2,11 @@ News for the tz database Unreleased, experimental changes + Changes affecting future time stamps + + Turks & Caicos is switching from US eastern time to UTC+4 year-round, + modeled as a switch from EST/EDT to AST on 2014-11-02 at 02:00. + Changes affecting past time stamps Time in Russia or the USSR before 1926 or so has been corrected by diff --git a/northamerica b/northamerica index c6ed74b..4c1d4bd 100644 --- a/northamerica +++ b/northamerica @@ -3117,16 +3117,22 @@ Zone America/Miquelon -3:44:40 - LMT 1911 May 15 # St Pierre # Shanks & Pottenger say they use US DST rules, but IATA SSIM (1991/1998) # says they switch at midnight. Go with Shanks & Pottenger. # +# From Paul Eggert (2014-08-19): +# The 2014-08-13 Cabinet meeting decided to stay on UTC-4 year-round. See: +# http://tcweeklynews.com/daylight-savings-time-to-be-maintained-p5353-127.htm +# Model this as a switch from EST/EDT to AST on 2014-11-02 at 02:00. +# # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S Rule TC 1979 1986 - Apr lastSun 2:00 1:00 D Rule TC 1979 2006 - Oct lastSun 2:00 0 S Rule TC 1987 2006 - Apr Sun>=1 2:00 1:00 D -Rule TC 2007 max - Mar Sun>=8 2:00 1:00 D -Rule TC 2007 max - Nov Sun>=1 2:00 0 S +Rule TC 2007 2014 - Mar Sun>=8 2:00 1:00 D +Rule TC 2007 2014 - Nov Sun>=1 2:00 0 S # Zone NAME GMTOFF RULES FORMAT [UNTIL] Zone America/Grand_Turk -4:44:32 - LMT 1890 -5:07:11 - KMT 1912 Feb # Kingston Mean Time - -5:00 TC E%sT + -5:00 TC E%sT 2014 Nov 2 2:00 + -4:00 - AST # British Virgin Is # Virgin Is -- 1.9.1

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[PROPOSED PATCH] Simplify new Turks & Caicos rules.
by Paul Eggert Aug. 19, 2014

Aug. 19, 2014

* northamerica (TC): Remove, as it's now a duplicate of the US rules. Remove obsolescent comment about this. (America/Grand_Turk): Use US rather than TC. --- northamerica | 13 ++----------- 1 file changed, 2 insertions(+), 11 deletions(-) diff --git a/northamerica b/northamerica index 4c1d4bd..ebfe5e3 100644 --- a/northamerica +++ b/northamerica @@ -3113,25 +3113,16 @@ Zone America/Miquelon -3:44:40 - LMT 1911 May 15 # St Pierre # Clocks are set back one hour at 2:00 a.m. local Daylight Saving Time" # indicating that the normal ET rules are followed. # -# From Paul Eggert (2006-05-01): -# Shanks & Pottenger say they use US DST rules, but IATA SSIM (1991/1998) -# says they switch at midnight. Go with Shanks & Pottenger. -# # From Paul Eggert (2014-08-19): # The 2014-08-13 Cabinet meeting decided to stay on UTC-4 year-round. See: # http://tcweeklynews.com/daylight-savings-time-to-be-maintained-p5353-127.htm # Model this as a switch from EST/EDT to AST on 2014-11-02 at 02:00. # -# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S -Rule TC 1979 1986 - Apr lastSun 2:00 1:00 D -Rule TC 1979 2006 - Oct lastSun 2:00 0 S -Rule TC 1987 2006 - Apr Sun>=1 2:00 1:00 D -Rule TC 2007 2014 - Mar Sun>=8 2:00 1:00 D -Rule TC 2007 2014 - Nov Sun>=1 2:00 0 S # Zone NAME GMTOFF RULES FORMAT [UNTIL] Zone America/Grand_Turk -4:44:32 - LMT 1890 -5:07:11 - KMT 1912 Feb # Kingston Mean Time - -5:00 TC E%sT 2014 Nov 2 2:00 + -5:00 - EST 1979 + -5:00 US E%sT 2014 Nov 2 2:00 -4:00 - AST # British Virgin Is -- 1.9.1

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[PROPOSED PATCH] * northamerica (TC, America/Grand_Turk): Switch from EST/EDT to AST.
by Paul Eggert Aug. 19, 2014

Aug. 19, 2014

* NEWS: Document this. --- NEWS | 5 +++++ northamerica | 12 +++++++++--- 2 files changed, 14 insertions(+), 3 deletions(-) diff --git a/NEWS b/NEWS index 1a78041..6fb00b0 100644 --- a/NEWS +++ b/NEWS @@ -2,6 +2,11 @@ News for the tz database Unreleased, experimental changes + Changes affecting future time stamps + + Turks & Caicos is switching from US eastern time to UTC+4 year-round, + modeled as a switch from EST/EDT to AST on 2014-11-02 at 02:00. + Changes affecting past time stamps Time in Russia or the USSR before 1926 or so has been corrected by diff --git a/northamerica b/northamerica index c6ed74b..4c1d4bd 100644 --- a/northamerica +++ b/northamerica @@ -3117,16 +3117,22 @@ Zone America/Miquelon -3:44:40 - LMT 1911 May 15 # St Pierre # Shanks & Pottenger say they use US DST rules, but IATA SSIM (1991/1998) # says they switch at midnight. Go with Shanks & Pottenger. # +# From Paul Eggert (2014-08-19): +# The 2014-08-13 Cabinet meeting decided to stay on UTC-4 year-round. See: +# http://tcweeklynews.com/daylight-savings-time-to-be-maintained-p5353-127.htm +# Model this as a switch from EST/EDT to AST on 2014-11-02 at 02:00. +# # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S Rule TC 1979 1986 - Apr lastSun 2:00 1:00 D Rule TC 1979 2006 - Oct lastSun 2:00 0 S Rule TC 1987 2006 - Apr Sun>=1 2:00 1:00 D -Rule TC 2007 max - Mar Sun>=8 2:00 1:00 D -Rule TC 2007 max - Nov Sun>=1 2:00 0 S +Rule TC 2007 2014 - Mar Sun>=8 2:00 1:00 D +Rule TC 2007 2014 - Nov Sun>=1 2:00 0 S # Zone NAME GMTOFF RULES FORMAT [UNTIL] Zone America/Grand_Turk -4:44:32 - LMT 1890 -5:07:11 - KMT 1912 Feb # Kingston Mean Time - -5:00 TC E%sT + -5:00 TC E%sT 2014 Nov 2 2:00 + -4:00 - AST # British Virgin Is # Virgin Is -- 1.9.1

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Europe/Glasgow looming?
by Paul Eggert Aug. 19, 2014

Aug. 19, 2014

Yesterday the BBC reported that Scottish independence could mean Scotland will part ways with the rest of the UK in the matter of time zones, which presumably would mean we'd need a Zone for Europe/Glasgow. The article does not discuss what might ensue in Ireland. Webber E. Scottish independence: Could vote help shift the debate on clocks? BBC News 2014-08-13. http://www.bbc.com/news/magazine-28744490 As a historical note, the article gives 1840 for the "first recorded occasion when local times in different parts of the UK were synchronised ... by the Great Western Railway". This refers to GWR's November 1840 order that London time be used in all its timetables and stations. For more, see: Carradice P. The Great Western Railway creates standard time. BBC Wales 2012-09-05. http://www.bbc.co.uk/blogs/wales/posts/the-great-western-railway-creates-st…

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[PROPOSED PATCH] * Makefile (strftime.o): Depend on private.h.
by Paul Eggert Aug. 18, 2014

Aug. 18, 2014

--- Makefile | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/Makefile b/Makefile index 3d24c2a..e4e2742 100644 --- a/Makefile +++ b/Makefile @@ -626,7 +626,7 @@ difftime.o: private.h ialloc.o: private.h localtime.o: private.h tzfile.h scheck.o: private.h -strftime.o: tzfile.h +strftime.o: private.h tzfile.h zdump.o: version.h zic.o: private.h tzfile.h version.h -- 1.9.1

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[PATCH] The word "data" is plural.
by Paul Eggert Aug. 17, 2014

Aug. 17, 2014

--- NEWS | 10 +++++----- Theory | 4 ++-- africa | 2 +- asia | 7 +++---- australasia | 2 +- europe | 2 +- newctime.3 | 2 +- northamerica | 2 +- southamerica | 2 +- tzfile.5 | 6 +++--- zic.8 | 2 +- 11 files changed, 20 insertions(+), 21 deletions(-) diff --git a/NEWS b/NEWS index 4be8450..9765e56 100644 --- a/NEWS +++ b/NEWS @@ -427,7 +427,7 @@ Release 2014a - 2014-03-07 23:30:29 -0800 Microsoft has some support for tz database names. - CLDR data is available in both XML and JSON form. + CLDR data are available in both XML and JSON form. Mention Maggiolo's map of solar vs standard time. (Thanks to Arthur David Olson.) @@ -671,8 +671,8 @@ Release 2013e - 2013-09-19 23:50:04 -0700 some errors before 1947. Some zones have been turned into links, when they differ from - existing zones only in older data that was likely invented or that - differs only in LMT or transition from LMT. These changes affect + existing zones only in older data that were likely invented or that + differ only in LMT or transitions from LMT. These changes affect only time stamps before 1943. The affected zones are: Africa/Juba, America/Anguilla, America/Aruba, America/Dominica, America/Grenada, America/Guadeloupe, America/Marigot, @@ -2543,7 +2543,7 @@ Release 94h - 1994-12-10 12:51:14 -0500 data files. Think of this as "TZ Classic" - the software has been set up not to break if - universal time shows up in its input, and the data has been left as is so as + universal time shows up in its input, and the data have been left as is so as not to break existing implementations. @@ -2623,7 +2623,7 @@ Release 93f - 1993-10-15 12:27:46 -0400 Release 93e - 1993-09-05 21:21:44 -0400 - There's updated data for Israel, England, and Kwajalein; there's + There are updated data for Israel, England, and Kwajalein; there's also an update to "zdump" to cope with Kwajalein's 24-hour jump. Thanks to Paul Eggert and Peter Ilieve for the changes. diff --git a/Theory b/Theory index 2a3a911..15c695e 100644 --- a/Theory +++ b/Theory @@ -254,7 +254,7 @@ Errors in the tz database arise from many sources: the current single entry for France would need to split into dozens of entries, perhaps hundreds. - * Most of the pre-1970 data comes from unreliable sources, often + * Most of the pre-1970 data come from unreliable sources, often astrology books that lack citations and whose compilers evidently invented entries when the true facts were unknown, without reporting which entries were known and which were invented. @@ -283,7 +283,7 @@ Errors in the tz database arise from many sources: Caledonian railways. * The tz database does not record the earliest time for which a - zone's data is thereafter valid for every location in the region. + zone's data are thereafter valid for every location in the region. For example, Europe/London is valid for all locations in its region after GMT was made the standard time, but the date of standardization (1880-08-02) is not in the tz database, other than diff --git a/africa b/africa index d251500..7e3a860 100644 --- a/africa +++ b/africa @@ -1,7 +1,7 @@ # This file is in the public domain, so clarified as of # 2009-05-17 by Arthur David Olson. -# This data is by no means authoritative; if you think you know better, +# This file is by no means authoritative; if you think you know better, # go ahead and edit the file (and please send any changes to # tz(a)iana.org for general use in the future). For more, please see # the file CONTRIBUTING in the tz distribution. diff --git a/asia b/asia index f8237f4..fbb9391 100644 --- a/asia +++ b/asia @@ -1,7 +1,7 @@ # This file is in the public domain, so clarified as of # 2009-05-17 by Arthur David Olson. -# This data is by no means authoritative; if you think you know better, +# This file is by no means authoritative; if you think you know better, # go ahead and edit the file (and please send any changes to # tz(a)iana.org for general use in the future). For more, please see # the file CONTRIBUTING in the tz distribution. @@ -386,7 +386,7 @@ Rule PRC 1987 1991 - Apr Sun>=10 0:00 1:00 D # Xujiahui Observatory was under French control and stuck with UT+8. # # In earlier versions of this file, China had many separate Zone entries, but -# this was based on what was apparently incorrect data in Shanks & Pottenger. +# this was based on what were apparently incorrect data in Shanks & Pottenger. # This has now been simplified to the two entries Asia/Shanghai and # Asia/Urumqi, with the others being links for backward compatibility. # Proposed in 1918 and theoretically in effect until 1949 (although in practice @@ -2630,8 +2630,7 @@ Rule Syria 2007 only - Nov Fri>=1 0:00 0 - # From Stephen Colebourne (2008-03-17): # For everyone's info, I saw an IATA time zone change for [Syria] for -# this month (March 2008) in the last day or so...This is the data IATA -# are now using: +# this month (March 2008) in the last day or so.... # Country Time Standard --- DST Start --- --- DST End --- DST # Name Zone Variation Time Date Time Date # Variation diff --git a/australasia b/australasia index 094383e..117e841 100644 --- a/australasia +++ b/australasia @@ -761,7 +761,7 @@ Zone Pacific/Wallis 12:15:20 - LMT 1901 # NOTES -# This data is by no means authoritative; if you think you know better, +# This file is by no means authoritative; if you think you know better, # go ahead and edit the file (and please send any changes to # tz(a)iana.org for general use in the future). For more, please see # the file CONTRIBUTING in the tz distribution. diff --git a/europe b/europe index 68a0dc7..261b619 100644 --- a/europe +++ b/europe @@ -1,7 +1,7 @@ # This file is in the public domain, so clarified as of # 2009-05-17 by Arthur David Olson. -# This data is by no means authoritative; if you think you know better, +# This file is by no means authoritative; if you think you know better, # go ahead and edit the file (and please send any changes to # tz(a)iana.org for general use in the future). For more, please see # the file CONTRIBUTING in the tz distribution. diff --git a/newctime.3 b/newctime.3 index dccab77..5a3f65a 100644 --- a/newctime.3 +++ b/newctime.3 @@ -235,7 +235,7 @@ time(2), tzfile(5) .SH NOTES The return values point to static data; -the data is overwritten by each call. +the data are overwritten by each call. The .B tm_zone field of a returned diff --git a/northamerica b/northamerica index 8958588..07cb33a 100644 --- a/northamerica +++ b/northamerica @@ -3,7 +3,7 @@ # also includes Central America and the Caribbean -# This data is by no means authoritative; if you think you know better, +# This file is by no means authoritative; if you think you know better, # go ahead and edit the file (and please send any changes to # tz(a)iana.org for general use in the future). For more, please see # the file CONTRIBUTING in the tz distribution. diff --git a/southamerica b/southamerica index 08a0731..0f0c233 100644 --- a/southamerica +++ b/southamerica @@ -1,7 +1,7 @@ # This file is in the public domain, so clarified as of # 2009-05-17 by Arthur David Olson. -# This data is by no means authoritative; if you think you know better, +# This file is by no means authoritative; if you think you know better, # go ahead and edit the file (and please send any changes to # tz(a)iana.org for general use in the future). For more, please see # the file CONTRIBUTING in the tz distribution. diff --git a/tzfile.5 b/tzfile.5 index f413349..182cc43 100644 --- a/tzfile.5 +++ b/tzfile.5 @@ -25,14 +25,14 @@ The number of UT/local indicators stored in the file. The number of standard/wall indicators stored in the file. .TP .I tzh_leapcnt -The number of leap seconds for which data is stored in the file. +The number of leap seconds for which data are stored in the file. .TP .I tzh_timecnt -The number of "transition times" for which data is stored +The number of "transition times" for which data are stored in the file. .TP .I tzh_typecnt -The number of "local time types" for which data is stored +The number of "local time types" for which data are stored in the file (must not be zero). .TP .I tzh_charcnt diff --git a/zic.8 b/zic.8 index a2e275d..2e5318a 100644 --- a/zic.8 +++ b/zic.8 @@ -72,7 +72,7 @@ no leap second information appears in output files. Be more verbose, and complain about the following situations: .RS .PP -The input data specifies a link to a link. +The input specifies a link to a link. .PP A year that appears in a data file is outside the range of years representable by -- 1.9.1

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The case against time zones
by Paul Eggert Aug. 17, 2014

Aug. 17, 2014

In Vox yesterday Matthew Yglesias argued that time zones ought to be abolished, writing "They were a good idea at the time, but in the modern world they cause more trouble than they are worth." It's tempting to agree. See: Yglesias M. The case against time zones: They're impractical & outdated. Vox 2014-08-05. http://www.vox.com/2014/8/5/5970767/case-against-time-zones Yglesias's underlying justification is essentially the same one that McCarthy and Klepczynski used in their proposal to discontinue leap seconds; see Steve Allen's summary of the resulting controversy in <http://www.ucolick.org/~sla/leapsecs/>.

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Clerical patches
by Tim Parenti Aug. 17, 2014

Aug. 17, 2014

A few more clerical patches, relative to 7217d26487456e93094be4c3befb6cdccfdc7bcc, dated Wed Aug 13 11:46:39 2014 -0700. 0001 fixes up some more minor spacing issues missed in my last round of patches on 2014-08-09. 0002 fixes another typo in recent additions to NEWS, and adds a space after the redirection operator in the new CONTRIBUTING file for added clarity. 0003 renames the fields of Link lines to be more descriptive and more like the parameters of 'ln'. (Personally, I have found LINK-FROM and LINK-TO to be the opposite of my expectations, and these are not particularly descriptive names anyway.) 0004 standardizes Link lines to use single tabs. These can be compared at https://github.com/timparenti/tz-experimental/compare/eggert:master...timpa… -- Tim Parenti

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[PROPOSED PATCH] * private.h (timegm, timelocal) [time_tz]: Define replacements.
by Paul Eggert Aug. 17, 2014

Aug. 17, 2014

Needed on Ubuntu 14.04 when compiling with -D_GNU_SOURCE -Dtime_tz=.... --- private.h | 10 ++++++++++ 1 file changed, 10 insertions(+) diff --git a/private.h b/private.h index 6d3e6aa..38f3f43 100644 --- a/private.h +++ b/private.h @@ -278,6 +278,10 @@ static time_t sys_time(time_t *x) { return time(x); } # define time2posix tz_time2posix # undef time_t # define time_t tz_time_t +# undef timegm +# define timegm tz_timegm +# undef timelocal +# define timelocal tz_timelocal # undef timeoff # define timeoff tz_timeoff @@ -316,6 +320,12 @@ void tzsetwall(void); # if !defined offtime || defined time_tz struct tm *offtime(time_t const *, long); # endif +# if !defined timegm || defined time_tz +time_t timegm(struct tm *); +# endif +# if !defined timelocal || defined time_tz +time_t timelocal(struct tm *); +# endif # if !defined timeoff || defined time_tz time_t timeoff(struct tm *, long); # endif -- 1.9.1

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