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TZ Changing in Chile on May, 14th.
by Luis Martinez Villa May 3, 2016

May 3, 2016

Dear IANA TZ, Since the last time change Chile has been in GMT-3 (i.e. Chile is right now in GMT-3). Chile is going to GMT-4 in May,14th midnight and returning to GMT-3 in August, 13th midnight. That means clocks will go back 1 hour at 00:00 May 15th (jumping back to May 14th); and will go forward by 1 hour on 00:00, August 14th. In tzdata2016c I can see this new rules for Chile: # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S Rule Chile 2016 max - May Sun>=9 3:00u 0 - Rule Chile 2016 max - Aug Sun>=9 4:00u 1:00 S And I can see this Chile zone definition: # Zone NAME GMTOFF RULES FORMAT [UNTIL] Zone America/Santiago -4:42:46 - LMT 1890 -4:42:46 - SMT 1910 Jan 10 # Santiago Mean Time -5:00 - CLT 1916 Jul 1 # Chile Time -4:42:46 - SMT 1918 Sep 10 -4:00 - CLT 1919 Jul 1 -4:42:46 - SMT 1927 Sep 1 -5:00 Chile CL%sT 1932 Sep 1 -4:00 - CLT 1942 Jun 1 -5:00 - CLT 1942 Aug 1 -4:00 - CLT 1946 Jul 15 -4:00 1:00 CLST 1946 Sep 1 # central Chile -4:00 - CLT 1947 Apr 1 -5:00 - CLT 1947 May 21 23:00 -4:00 Chile CL%sT But with these two information I'm not sure that in the midnight of May, 14th this tzdata2016c will change the TZ of Chile from GMT-3 to GMT-4. Can you please explain me how these structures in tzdata2016c work to accomplish the necessary TZ change in Chile. Thank you very much, best regards. Luis

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[PROPOSED PATCH 1/2] Mostly work around Qt bug 53071 by inserting dummy
by Paul Eggert May 1, 2016

May 1, 2016

Problem reported by Zhanibek Adilbekov in: http://mm.icann.org/pipermail/tz/2016-April/023605.html Also see the Qt bug report in: https://bugreports.qt.io/browse/QTBUG-53071 * NEWS: Document this. * zic.c (WORK_AROUND_QTBUG_53071): New constant. (growalloc): Don't grow past INT_MAX - 1 if the bug is present, since we add 1 at the end. (writezone) [WORK_AROUND_QTBUG_53071]: Work around most of QTBUG-53071, by inserting a dummy transition at time 2**31 - 1. --- NEWS | 7 +++++++ zic.c | 30 +++++++++++++++++++++++++++--- 2 files changed, 34 insertions(+), 3 deletions(-) diff --git a/NEWS b/NEWS index e16f489..b5fb182 100644 --- a/NEWS +++ b/NEWS @@ -14,6 +14,13 @@ Unreleased, experimental changes Asia/Baku's 1992-09-27 transition from +04 (DST) to +04 (non-DST) was at 03:00, not 23:00 the previous day. (Thanks to Michael Deckers.) + Changes to code + + zic now outputs a dummy transition at time 2**31 - 1 in zones + whose POSIX-style TZ strings contain a '<'. This mostly works + around Qt bug 53071 <https://bugreports.qt.io/browse/QTBUG-53071>. + (Thanks to Zhanibek Adilbekov for reporting the Qt bug.) + Changes affecting documentation and commentary tz-link.htm says why governments should give plenty of notice for diff --git a/zic.c b/zic.c index 0ec3359..3b32f9b 100644 --- a/zic.c +++ b/zic.c @@ -143,6 +143,13 @@ static bool yearistype(int year, const char * type); /* Bound on length of what %z can expand to. */ enum { PERCENT_Z_LEN_BOUND = sizeof "+995959" - 1 }; +/* If true, work around a bug in Qt 5.6 and earlier, which mishandles + tzdata binary files whose POSIX-TZ-style strings contain '<'; see + QTBUG-53071 <https://bugreports.qt.io/browse/QTBUG-53071>. This + workaround will no longer be needed when Qt 5.6 is obsolete, say in + the year 2021. */ +enum { WORK_AROUND_QTBUG_53071 = true }; + static int charcnt; static bool errors; static bool warnings; @@ -420,7 +427,8 @@ growalloc(void *ptr, size_t itemsize, int nitems, int *nitems_alloc) if (nitems < *nitems_alloc) return ptr; else { - int amax = INT_MAX < SIZE_MAX ? INT_MAX : SIZE_MAX; + int nitems_max = INT_MAX - WORK_AROUND_QTBUG_53071; + int amax = nitems_max < SIZE_MAX ? nitems_max : SIZE_MAX; if ((amax - 1) / 3 * 2 < *nitems_alloc) memory_exhausted(_("int overflow")); *nitems_alloc = *nitems_alloc + (*nitems_alloc >> 1) + 1; @@ -1616,8 +1624,11 @@ writezone(const char *const name, const char *const string, char version) char * fullname; static const struct tzhead tzh0; static struct tzhead tzh; - zic_t *ats = emalloc(size_product(timecnt, sizeof *ats + 1)); - void *typesptr = ats + timecnt; + zic_t one = 1; + zic_t y2038_boundary = one << 31; + int nats = timecnt + WORK_AROUND_QTBUG_53071; + zic_t *ats = emalloc(size_product(nats, sizeof *ats + 1)); + void *typesptr = ats + nats; unsigned char *types = typesptr; /* @@ -1661,6 +1672,19 @@ writezone(const char *const name, const char *const string, char version) ats[i] = attypes[i].at; types[i] = attypes[i].type; } + + /* Work around QTBUG-53071 for time stamps less than y2038_boundary - 1, + by inserting a no-op transition at time y2038_boundary - 1. + This works only for timestamps before the boundary, which + should be good enough in practice as QTBUG-53071 should be + long-dead by 2038. */ + if (WORK_AROUND_QTBUG_53071 && timecnt != 0 + && ats[timecnt - 1] < y2038_boundary - 1 && strchr(string, '<')) { + ats[timecnt] = y2038_boundary - 1; + types[timecnt] = types[timecnt - 1]; + timecnt++; + } + /* ** Correct for leap seconds. */ -- 2.7.4

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[PROPOSED PATCH] Fix minor glitches in Morocco rule formatting
by Paul Eggert May 1, 2016

May 1, 2016

These changes do not affect the data per se, only how it is formatted in the source. (Thanks to Corey Danielson.) * africa (Morocco): Use "0:00" for time, not "0". Sort 2012 transitions by date. --- africa | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/africa b/africa index 442b326..547e215 100644 --- a/africa +++ b/africa @@ -944,11 +944,11 @@ Rule Morocco 2009 only - Aug 21 0:00 0 - Rule Morocco 2010 only - May 2 0:00 1:00 S Rule Morocco 2010 only - Aug 8 0:00 0 - Rule Morocco 2011 only - Apr 3 0:00 1:00 S -Rule Morocco 2011 only - Jul 31 0 0 - +Rule Morocco 2011 only - Jul 31 0:00 0 - Rule Morocco 2012 2013 - Apr lastSun 2:00 1:00 S -Rule Morocco 2012 only - Sep 30 3:00 0 - Rule Morocco 2012 only - Jul 20 3:00 0 - Rule Morocco 2012 only - Aug 20 2:00 1:00 S +Rule Morocco 2012 only - Sep 30 3:00 0 - Rule Morocco 2013 only - Jul 7 3:00 0 - Rule Morocco 2013 only - Aug 10 2:00 1:00 S Rule Morocco 2013 max - Oct lastSun 3:00 0 - -- 2.7.4

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Programmatic way of determining the latest release number?
by Jon Skeet April 30, 2016

April 30, 2016

Hi folks, I'm aware of the ability to use ftp://ftp.iana.org/tz/tzcode-latest.tar.gz and the similar data URL to get the latest actual files, but is there a URL which either serves an HTTP redirect to the latest version, or gives the latest version number in some other easily-retrievable machine-readable format? I could parse the content of http://www.iana.org/time-zones, but that doesn't feel like a very robust approach :) Presumably this might all drop out of the tzdist work, but I was wondering whether there was a low-tech way at the moment. Jon

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Re: [tz] Issue in Time Zone Database for Kazakhstan's zones
by Paul Eggert April 29, 2016

April 29, 2016

On 04/28/2016 10:27 AM, Zhanibek Adilbekov wrote: > > formats of zones are changed, e.g. for Asia/Almaty it changed from > ALMT to +06. I'm not familiar with TZ files, but I suppose this > changes are the reason of incompatibility for some apps. > Yes, I think that's relevant to the Plasma Digital Clock bug. I found what appears to be a related bug in the way that Qt handles data from tz 2016b, so the problem is not limited to tz 2016d. I can reproduce the problem by using just the Qt base, without involving KDE or Plasma. The Qt base parses tz data directly (!), and appears to do so incorrectly. I have filed a Qt bug report here: https://bugreports.qt.io/browse/QTBUG-53071 zic.c already has workarounds for buggy programs that misparse tzdata files containing time stamps far in the past, by putting in a no-change transition before the Big Bang. Perhaps there could be a similar workaround for this Qt bug, as Qt appears to mishandle tzdata files where the predicted future uses a POSIX TZ string that assumes POSIX.1-2001 or later. That is, perhaps we can work around the Qt bug by appending to the binary data some sort of no-change transition far enough in the future that we can expect Qt to be fixed in the field before most users care about those future time stamps. The year 2116, say?

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by support＠anuko.com April 28, 2016

April 28, 2016

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Issue in Time Zone Database for Kazakhstan's zones
by Zhanibek Adilbekov April 28, 2016

April 28, 2016

After upgrading tzdata to 2016d version some of applications unable to determine right timezone for all zones which belong to Kazakhstan. I personally use Asia/Almaty (which is +06:00 and no DST) on my machine (Arch Linux with Plasma 5.6), and it leads some programs to produce unexpected results. E.g.: Digital Clock applet shows -12 hours from current time and Plasma Lockscreen shows time in UTC. I tried downgrade to 2016c and it works just fine. Please fix the issue, or at least return to previous state (which worked fine). Thanks! -- Best regards, Zhanibek Adilbekov. Tel: +7 707 817 5253 Skype: zhanibek.adilbekov Email:zhanibek.adilbekov@gmail.com zhanibek.adilbekov(a)live.com liljay.it(a)gmail.com

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Tomsk to change time zone on May 29, 2016
by Alexander Krivenyshev April 26, 2016

April 26, 2016

Just to reconfirm Stepan Golosunov about Tomsk time change: The bill passed its 3rd reading by the State Duma on April 15, 2016 and was approved by the Federation Council on April 20, 2016. Waiting to be officially sign by the President. Ref. links: http://asozd2.duma.gov.ru/main.nsf/%28SpravkaNew%29?OpenAgent&RN=1006865- 6&02 http://asozd2.duma.gov.ru/work/dz.nsf/ByID/1243C6FFC37C451143257F94004BE6D8/ $File/%D0%A2%D0%B5%D0%BA%D1%81%D1%82%20%D0%B7%D0%B0%D0%BA%D0%BE%D0%BD%D0%B0% 20-%203%20%D1%87%D1%82%D0%B5%D0%BD%D0%B8%D0%B5.doc?OpenElement with 99.99% certainty, Tomsk will move from UTC+6 to UTC+7 time zone on May 29, 2016 at 2 o'clock 00 minutes. Alexander Krivenyshev http://www.worldtimezone.com New York, NY

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Montreal timezone
by Vincent Tourneyrie April 23, 2016

April 23, 2016

Dear Sir, Madam, I discovered that you are at the origin of the removal of the Montreal/America timezone and it's integration within Toronto. The problem is that this move to a secondary timezone leads to tons of problems and hours of corrections and explanation (mainly due to quick and dirty implementations of TZ but I cannot blame half of the developers of the planet). The fact that PHP uses this list expose this timezone list to the public. I got many angry comments on this change from French speaking people and Europeans because Toronto is less recognized and known (not to mention loved) than Montreal. We have 8 millions of Quebec people which will drag their feet to adopt (in fact most of them put NY) and probably half of 220 millions francophone who have no idea where Toronto is (like many people know where Geneva is but have no idea where Zurich is). It looks that you do not get that end users use this. I understand the willing of normalization but Toronto will never be significant as TZ name for all Eastern Time in Canada. I think this change has to be reversed, -- Vincent Tourneyrie Vinceti 514 907 9124 Visitez www.vinceti.ca[1] -------- [1] http://www.vinceti.ca

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Venezuela to change time zone on May 1
by Alexander Krivenyshev April 20, 2016

April 20, 2016

According to some news, https://actualidad.rt.com/actualidad/204758-venezuela-modificar-huso-horari… sequia-elnino Venezuela to change its time zone on May 1 because of El Niño (prolonged drought). It was not specified if clocks would roll forward or backward. Updates will follow in the next few days. Regards, Alexander Krivenyshev, WorldTimeZone.com

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