- tz - lists.iana.org

gcc 8 demanded patch (from NetBSD)
by Robert Elz May 11, 2017

May 11, 2017

The following patch was recently added to NetBSD, to appease GCC 8 (apparently) ... "hit" is a bool, and it seems gcc 8 does not like ++ operators applied to one of those. (deleted parts of the diff which just showed the version ID string being updated...) kre Index: src/lib/libc/time/localtime.c diff -u src/lib/libc/time/localtime.c:1.106 src/lib/libc/time/localtime.c:1.107 --- src/lib/libc/time/localtime.c:1.106 Sat Mar 11 18:23:14 2017 +++ src/lib/libc/time/localtime.c Tue May 9 02:30:49 2017 @@ -1716,7 +1716,7 @@ timesub(const time_t *timep, int_fast32_ sp->lsis[i - 1].ls_trans + 1 && sp->lsis[i].ls_corr == sp->lsis[i - 1].ls_corr + 1) { - ++hit; + hit = true; --i; } }

8 13

TZDEFRULESTRING is increasingly out-of-date
by Tom Lane May 7, 2017

May 7, 2017

Due to a script's unintended failure to supply a -p option to zic, I recently had my nose rubbed in the fact that localtime.c still has this as the fallback when the "posixrules" link can't be loaded: /* ** The DST rules to use if TZ has no rules and we can't load TZDEFRULES. ** We default to US rules as of 1999-08-17. ** POSIX 1003.1 section 8.1.1 says that the default DST rules are ** implementation dependent; for historical reasons, US rules are a ** common default. */ #ifndef TZDEFRULESTRING #define TZDEFRULESTRING ",M4.1.0,M10.5.0" #endif /* !defined TZDEFDST */ It's now over ten years since the US last followed those rules; isn't it time to update TZDEFRULESTRING to match current law? I can't really think of any situation where the current default would be of any value now. Apologies if this policy is being followed intentionally; but I couldn't find any discussion of the point by googling. regards, tom lane

2 1

Potted history of timekeeping from the BBC
by John Haxby April 21, 2017

April 21, 2017

This is from a series of things that made the modern economy, it says on the web page: Tick tock: The importance of knowing the right time: http://www.bbc.co.uk/news/business-39129620 In one short page it manages to mention everything but DST :) and it includes a picture of Harrison No 1. (If you're ever near Greenwich I recommend visiting the Royal Observatory, taking the obligatory foot-in-both-hemispheres selfie and then going to look at the clocks.) >From the BBC web page though, I particularly noticed this: > Some financiers recently calculated it was worth spending $300m (£247m) drilling through mountains between Chicago and New York to lay fibre-optic cables in a slightly straighter line. That sped up communication between the two cities' exchanges by three milliseconds. jch

10 10

Re: [tz] leapseconds.awk, LEAP directives and references
by Chris Woodbury April 21, 2017

April 21, 2017

In the course of reviewing the AWK script leapseconds.awk, I was disturbed by the fact that it (1) operated on the comments (probably not a good idea) in the NIST produced leap-seconds.list file rather than the NTP timestamp itself and (2) that it assumed that leap seconds would only occur in December and June. The regulation that governs leap seconds, ITU-R TF.460-6 <https://www.itu.int/rec/R-REC-TF.460-6-200202-I/>, actually allows leap seconds to occur at the end of any UTC month. Annex 1, Section 2: Leap Seconds 2.1 A positive or negative leap-second should be the last second of a UTC month, but first preference should be given to the end of December and June, and second preference to the end of March and September. I note, in the event of a (highly unlikely) negative leap second, the LEAP directive generated is for 23:59:59 which, in the case of a negative leap second, doesn't exist. I reviewed the C code and, it seems to me, the transaction added should actually be for the second before, 23:59:58, as the transaction itself causes 23:59:59 to be skippedaltogether. (Kinda hard to skip an event if you're in it.) I bring this up as I've alrady written the changes necessary but I want to verify the correctness of this last beforesubmitting them. Also, I've an AWK script that uses the IERS file Leap_Seconds.dat rather than the NIST leap-seconds.listfile. Leap_Seconds.dat is a straight list of leap-seconds. USNO MAIA also has straight list of leap-seconds in a different format. See URLs: <http://hpiers.obspm.fr/iers/bul/bulc/Leap_Seconds.dat> <http://maia.usno.navy.mil/ser7/leapsec.dat> Either of these would, particularly the IERS file as it has few but excellent comments, be a better source of leap-second information than the once removed NIST file leap-seconds.list; which is purposed for another task. Lastly, thanks to Dr. Eggert for including the reference I gave him to the AAPT Resource Letter that included Terry Quinn's article in the NIST Time and Frequency Division's PDF archive (1168). Anyone wanting to know about Time and Frequency Measurement might want to read the other articles as well as Dr. Quinn's. Another good, comprehensive article is "The leap second: its history and possible future" by R.A. Nelson, et al, from Metrogia Vol 38, pp. 509-529 (2001). PDF available (with permission) at: <https://www.cl.cam.ac.uk/~mgk25/time/metrologia-leapsecond.pdf>

9 16

[PROPOSED] Use railway time for India from 1870-1941
by Paul Eggert April 20, 2017

April 20, 2017

From: Paul Eggert <eggert(a)Penguin.CS.UCLA.EDU> * NEWS: Document this. * asia (Asia/Yangon): Add 7 s to times from 1880 to 1920. (Asia/Kolkata): Switch from HMT to MMT in 1870, and from MMT to IST in 1906. --- NEWS | 11 +++++++++++ asia | 59 +++++++++++++++++++++++++++++++++++++++++++++++++++++------ 2 files changed, 64 insertions(+), 6 deletions(-) diff --git a/NEWS b/NEWS index f986cf6..ad099f4 100644 --- a/NEWS +++ b/NEWS @@ -1,5 +1,16 @@ News for the tz database +Unreleased, experimental changes + + Changes to past time stamps + + Use railway time for Asia/Kolkata before 1941, by switching to + Madras local time (UT +052110) in 1870, then to IST (UT +0530) in + 1906. Also, treat 1941-2's +0630 as DST, like 1942-5. + + Add 7 s to the UT offset in Asia/Yangon before 1920. + + Release 2017b - 2017-03-17 07:30:38 -0700 Briefly: Haiti has resumed DST. diff --git a/asia b/asia index 35774c6..f027071 100644 --- a/asia +++ b/asia @@ -258,9 +258,15 @@ Zone Asia/Brunei 7:39:40 - LMT 1926 Mar # Bandar Seri Begawan # Milne says 6:24:40 was the meridian of the time ball observatory at Rangoon. +# From Paul Eggert (2017-04-20): +# Page 27 of Reed & Low (cited for Asia/Kolkata) says "Rangoon local time is +# used upon the railways and telegraphs of Burma, and is 6h. 24m. 47s. ahead +# of Greenwich." This refers to the period before Burma's transition to +0630, +# a transition for which Shanks is the only source. + # Zone NAME GMTOFF RULES FORMAT [UNTIL] -Zone Asia/Yangon 6:24:40 - LMT 1880 # or Rangoon - 6:24:40 - RMT 1920 # Rangoon Mean Time? +Zone Asia/Yangon 6:24:47 - LMT 1880 # or Rangoon + 6:24:47 - RMT 1920 # Rangoon local time 6:30 - +0630 1942 May 9:00 - +09 1945 May 3 6:30 - +0630 @@ -887,14 +893,55 @@ Zone Asia/Dili 8:22:20 - LMT 1912 Jan 1 # local time in favor of Indian Standard Time.... Journalists called this # dispute the "Battle of the Clocks." It lasted nearly half a century. +# From Paul Eggert (2017-04-20): +# Good luck trying to nail down old timekeeping records in India. +# "... in the nineteenth century ... Madras Observatory took its magnetic +# measurements in Göttingen time, its meterological measurements on Madras +# (local) time, dropped its time ball on Greenwich (ocean navigator's) time, +# and distributed civil (local time)." -- Bartky IR. Selling the time: +# 19th-century timekeeping in america. Stanford U Press (2000), 247 note 19. +# "A more potent cause of resistance to the general adoption of the present +# standard time lies in the fact that it is Madras time. The citizen of +# Bombay, proud of being 'primus in Indis' and of Calcutta, equally proud of +# his city being the Capital of India, and - for a part of the year - the Seat +# of the Supreme Government, alike look down on Madras, and refuse to change +# the time they are using, for that of what they regard as a benighted +# Presidency; while Madras, having for long given the standard time to the +# rest of India, would resist the adoption of any other Indian standard in its +# place." -- Oldham RD. On Time in India: a suggestion for its improvement. +# Proceedings of the Asiatic Society of Bengal (April 1899), 49-55. +# +# "In 1870 ... Madras time - 'now used by the telegraph and regulated from the +# only government observatory' - was suggested as a standard railway time, +# first to be dopted on the Great Indian Peninsular Railway (GIPR).... +# Calcutta, Bombay, and Karachi, were to be allowed to continue with their +# local time for civil purposes." - Prasad R. Tracks of Change: Railways and +# Everyday Life in Colonial India. Cambridge University Press (2016), 145. +# +# Reed S, Low F. The Indian Year Book 1936-37. Bennett, Coleman, pp 27-8. +# https://archive.org/details/in.ernet.dli.2015.282212 +# This lists +052110 as Madras local time used in railways, and says that on +# 1906-01-01 railways and telegraphs in India switched to +0530. Some +# municipalities retained their former time, and the time in Calcutta +# continued to depend on whether you were at the railway station or at +# government offices. Government time was at +055320 (according to Shanks) or +# at +0554 (according to the Indian Year Book). Railway time is more +# appropriate for our purposes, as it was better documented, it is what we do +# elsewhere (e.g., Europe/London before 1880), and after 1906 it was +# consistent in the region now identified by Asia/Kolkata. So, use railway +# time for 1870-1941. Shanks is our only (and dubious) source for the +# 1941-1945 data. + # Zone NAME GMTOFF RULES FORMAT [UNTIL] -Zone Asia/Kolkata 5:53:28 - LMT 1880 # Kolkata - 5:53:20 - HMT 1941 Oct # Howrah Mean Time? - 6:30 - +0630 1942 May 15 +Zone Asia/Kolkata 5:53:28 - LMT 1854 Jun 28 # Kolkata + 5:53:20 - HMT 1870 # Howrah Mean Time? + 5:21:10 - MMT 1906 Jan 1 # Madras local time + 5:30 - IST 1941 Oct + 5:30 1:00 +0630 1942 May 15 5:30 - IST 1942 Sep 5:30 1:00 +0630 1945 Oct 15 5:30 - IST -# The following are like Asia/Kolkata: +# Since 1970 the following are like Asia/Kolkata: # Andaman Is # Lakshadweep (Laccadive, Minicoy and Amindivi Is) # Nicobar Is -- 2.9.3

1 0

Mouradconstantine@icloud.com
by Mourad Constantine April 13, 2017

April 13, 2017

Sent from my iPhone

1 0

Urumqi timezone.
by gfb hjjhjh April 13, 2017

April 13, 2017

As there are two different timmezones being used in Xinjiang, China, would it be a good idea to create another timezone named something like Asia/Urumqi2 to correspond to the different timezone being used in the area?

9 13

Fwd: [IANA #939704] Contributions to this list
by Erast Fandorin April 8, 2017

April 8, 2017

Dear Sir/Madam Please make the changes to time zone database: Ukraine: Kiev => Kyiv, Zaporozh'ye => Zaporizhia, Uzhgorod => Uzhhorod, Odessa => Odesa according to legal names and MORE COMMON USE in ENGLISH (like booking services or names of the airports, railway stations, river and sea ports and everyday speaking usage). Autonomous Republic of Crimea (Ukraine): Crimea, Republic of => Crimea, Autonomous Republic of according to legal name of the Ukrainian territory occupied by Russians terrorists forces. The name "Autonomous Republic of Crimea" is officially recognized by all of the countries (except the Russian Federation - the terrorist's country number one in the World) and in international COMMON USE in ENGLISH navigation systems of the air, sea and river transport systems. Sevastopol MSK => Sevastopol KMT Simferopol MSK => Simferopol KMT according to legal time usage on the Ukrainian territory -------- Forwarded Message -------- Тема: [IANA #939704] Contributions to this list Дата: Thu, 01 Dec 2016 20:16:50 +0000 Від: Amanda Baber via RT <iana-questions(a)iana.org> <iana-questions(a)iana.org> Відповісти: iana-questions(a)iana.org Кому: aristonomy(a)gmail.com Dear Sir/Madam, Thank you for contacting us. We host the Time Zone Database, but updates are made by the Time Zone Coordinator in consultation with the Time Zone mailing list, in accordance with RFC 6557. Questions about the contents of the database should be sent to the mailing list. For mailing list archives and subscription information, please see http://www.iana.org/time-zones Best regards, Amanda Baber Lead IANA Services Specialist PTI On Thu Dec 01 10:28:43 2016, aristonomy(a)gmail.com wrote: > To the holder of iana.org! > > Contributions to this list of time zones! > > "Uzhhorod International Airport", "Kyiv International Airport > (Zhuliany)", "Kyiv Boryspil international airport", "Zaporizhia > International Airport" which are MORE COMMON USE in every ENGLISH > booking service. The same names are used in the railway stations names > and booking services. > > Even more! Kyiv, Uzhhorod, Zaporizhia, Odesa are the international names > of the cityes, river and sea ports, airports and railway stations, parts > of the administration and state organizations names and etcetera. > > The only common use of the names: Kiev, Zaporozh'ye, Uzhgorod and Odessa > were in USSR - the country which is not exist any more (thanks to God!), > and in the country which are occupied the part of Ukraine. Supporting > such spelling is a direct support of the country which is now are the N1 > Country Terrorist of the World!! > > Europe/Simferopol and Europe/Sevastopol now are under Russian occupation > and NO legal international communications for hole Autonomous Republic > of Crimea (Ukraine) and this territory are legally under Ukrainians Law! > > Supporting of the time change to the MSK time zone is a direct support > of occupation!! > > This letter are public and will be shared to social network. > > Stop support of Russian invasion to Ukraine and Georgia!! Stop support > of the biggest terrorists organization which Russian Federation are! > > > # From Tim Parenti (2014-07-03): > > # Europe/Simferopol covers... > > # ** **** Crimea, Republic of > > # ** **** Sevastopol > > > > Zone Europe/Simferopol 2:16:24 - LMT 1880 > > 2:16 - SMT 1924 May 2 # Simferopol Mean T > > 2:00 - EET 1930 Jun 21 > > 3:00 - MSK 1941 Nov > > 1:00 C-Eur CE%sT 1944 Apr 13 > > 3:00 Russia MSK/MSD 1990 > > 3:00 - MSK 1990 Jul 1 2:00 > > 2:00 - EET 1992 > > # Central Crimea used Moscow time 1994/1997. > > # > > # From Paul Eggert (2006-03-22): > > # The _Economist_ (1994-05-28, p 45) reports that central Crimea switched > > # from Kiev to Moscow time sometime after the January 1994 elections. > > # Shanks (1999) says "date of change uncertain", but implies that it > > happened > > # sometime between the 1994 DST switches. Shanks & Pottenger simply say > > # 1994-09-25 03:00, but that can't be right. For now, guess it > > # changed in May. > > 2:00 E-Eur EE%sT 1994 May > > # From IATA SSIM (1994/1997), which also says that Kerch is still like > > Kiev. > > 3:00 E-Eur MSK/MSD 1996 Mar 31 0:00s > > 3:00 1:00 MSD 1996 Oct 27 3:00s > > # IATA SSIM (1997-09) says Crimea switched to EET/EEST. > > # Assume it happened in March by not changing the clocks. > > 3:00 Russia MSK/MSD 1997 > > 3:00 - MSK 1997 Mar lastSun 1:00u > > # From Alexander Krivenyshev (2014-03-17): > > # time change at 2:00 (2am) on March 30, 2014 > > # http://vz.ru/news/2014/3/17/677464.html > > # From Paul Eggert (2014-03-30): > > # Simferopol and Sevastopol reportedly changed their central town clocks > > # late the previous day, but this appears to have been ceremonial > > # and the discrepancies are small enough to not worry about. > > 2:00 EU EE%sT 2014 Mar 30 2:00 > > 4:00 - MSK 2014 Oct 26 2:00s > > 3:00 - MSK > > > > > > > > # Zone NAME GMTOFF RULES FORMAT [UNTIL] > > # Most of Ukraine since 1970 has been like Kiev. > > # "Kyiv" is the transliteration of the Ukrainian name, but > > # "Kiev" is more common in English. > > Zone Europe/Kiev 2:02:04 - LMT 1880 > > 2:02:04 - KMT 1924 May 2 # Kiev Mean Time > > > > # "Uzhhorod" is the transliteration of the Rusyn/Ukrainian > > pronunciation, but > > # "Uzhgorod" is more common in English. > > Zone Europe/Uzhgorod 1:29:12 - LMT 1890 Oct > > > > # Zaporozh'ye and eastern Lugansk oblasts observed DST 1990/1991. > > # "Zaporizhia" is the transliteration of the Ukrainian name, but > > # "Zaporozh'ye" is more common in English. Use the common English > > # spelling, except omit the apostrophe as it is not allowed in > > # portable Posix file names. > > Zone Europe/Zaporozhye 2:20:40 - LMT 1880 >

2 1

MS-Windows 10 and New Zealand yesterday
by Paul Eggert April 3, 2017

April 3, 2017

Chris Keall of the National Business Review (New Zealand) reports that laptops and phones running Microsoft Windows 10 missed the end of daylight saving time in New Zealand yesterday. Microsoft Windows 7 laptops operated correctly. This leads me to think that the problem has something to do with the tz database, as MS-Windows 7 does not use tzdata whereas MS-Windows 8.1 and later use tzdata, at least in some cases. Does anyone have technical information about why the glitch happened? Is there some way we can help avoid it in the future? Keall C. Living in the past: Windows 10 fails to update for end of daylight saving. NBR 2017-04-03. https://www.nbr.co.nz/article/living-past-windows-10-fails-update-end-dayli…

3 2

zone.tab / zone1970.tab inconsistency for TF/UM/VN
by Neil Fuller April 3, 2017

April 3, 2017

This may be a misunderstanding on my part about the file formats of zone.tab and zone1970.tab and how consistent they are expected to be. I expect the exact zone IDs to be different, but there are only a few cases where countries differ in the number of referenced zone IDs. I realize that zone.tab is intended for backward compatibility but it looks like it is being well maintained. Is this difference expected? If it is, can somebody explain? Details below the line. Thanks for all the hard work. Neil. ------------------- 2017b: TF zone.tab: TF -492110+0701303 Indian/Kerguelen zone1970.tab: RE,TF -2052+05528 Indian/Reunion Réunion, Crozet, Scattered Islands TF -492110+0701303 Indian/Kerguelen Kerguelen, St Paul Island, Amsterdam Island ------------------ UM zone.tab: UM +2813-17722 Pacific/Midway Midway Islands UM +1917+16637 Pacific/Wake Wake Island zone1970.tab: AS,UM -1416-17042 Pacific/Pago_Pago Samoa, Midway UM +1917+16637 Pacific/Wake Wake Island US,UM +211825-1575130 Pacific/Honolulu Hawaii ------------------ VN zone.tab: VN +1045+10640 Asia/Ho_Chi_Minh zone1970.tab: TH,KH,LA,VN +1345+10031 Asia/Bangkok Indochina (most areas) VN +1045+10640 Asia/Ho_Chi_Minh Vietnam (south) -- Google UK Limited Registered Office: 6 Pancras Square, London, N1C 4AG Registered in England Number: 3977902

2 2