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error in zone Erope/Vienna 1946
by Alois Treindl July 25, 2019

July 25, 2019

2 1

Error in zone America/Edmonton 1967, no DST
by Alois Treindl July 25, 2019

July 25, 2019

2 2

Error in America/Vancouver for 1946
by Alois Treindl July 25, 2019

July 25, 2019

3 7

Indian Time zone history and choice of Kolkata as reference location
by Alois Treindl July 24, 2019

July 24, 2019

3 3

tzdata2019b failing to be parsed
by Ian Kaebery July 22, 2019

July 22, 2019

Hello, I’m having trouble with the TZUpdater tool. I’m using the latest version to try and update my timezone definitions to either the ‘latest' package, or the ‘2019b' package, retreived from the IANA website. Both are failing on an entry with Japan using a time of 25:00. I’ve read inconsistent comments on the internet stating a number of things - that this was fixed in the 2018 version, or that there is a script you can run to patch the line, or that there’s an unofficial version (rearguard?) available - but since this is for work I’d prefer to use an unmodified and up-to-date (>2018) version directly from IANA’s website. Do you know if there is any official package I can use for the 2019b definitions that would work with the TZUpdater tool? Thanks very much, Ian

4 4

time zone history Nagorno-Karabakh
by Alois Treindl July 21, 2019

July 21, 2019

Nagorno-Karabakh is an 'Armenian enclave' inside Azerbaijan, which seceded from Azerbaijan in the 1990s, and has some kind of unclear status of autonomy since a ceasefire agreement in 1994. See https://en.wikipedia.org/wiki/Nagorno-Karabakh and https://en.wikipedia.org/wiki/Nagorno-Karabakh_Autonomous_Oblast Azerbaijan and Armenia have different time zone rules, represented in TZ by Asia/Baku and Asia/Yerevan. Has anyone researched the time zone and DST rules in Nagorno-Karabakh? If the time zone rules followed locally differ from Azerbaijan, the situation there justifies the creation of a separate TZ zone. The zone exists now since 25 years with rather high political stability.

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Brazil might stick with daylight saving after all
by Paul Eggert July 21, 2019

July 21, 2019

Our reward for pushing out tzdb 2019b to publish Brazil's DST abolition months early, is that Brazilian President Bolsonaro is now threatening to change his mind and not abolish DST after all. On Thursday, Bolsonaro signaled that possibility as follows: “A minha caneta Bic está à disposição de vocês, qualquer decreto pode ser modificado. A gente entra em contato com a assessoria de assuntos jurídicos e estuda. Se for o caso, a gente altera o decreto para atender o bem-estar da população, sem extrapolar os limites da lei.” Google Translate renders this as: “My Bic pen is at your disposal, any decree can be modified. We get in touch with legal counsel and study. If this is the case, we amend the decree to meet the welfare of the population, without extrapolating the limits of the law.” Reference: Ernesto M. Bolsonaro sinaliza que pode voltar com horário de verão. Correio Braziliense. 2019-07-18. https://www.correiobraziliense.com.br/app/noticia/politica/2019/07/18/inter…

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Dubious coding in tzcode 2019b
by Tom Lane July 20, 2019

July 20, 2019

Some compilers in the Postgres buildfarm are unhappy[1] about this coding in 2019b's zic.c: register ptrdiff_t thistimei, thistimecnt, thistimelim; bool locut, hicut; ... thistimecnt = - locut - hicut; I think they have a point: at best this code is seriously opaque, and at worst it's unportable. I can't even figure out whether this is assuming that bool promotes to signed or unsigned int; and even if whichever choice that is supported by the C99 spec, what will happen in environments where "bool" does not mean the C99 type, but rather signed or unsigned char? (For my immediate purposes, that includes every released branch of Postgres :-(.) I think this would be a lot better if it were written as some if-tests that just consider locut and hicut as boolean values, without any assumptions about how bool converts to integer. If we must have such assumptions, please write them as explicit casts. While the compilers aren't whining about it, this line a bit further down seems like equally bad style to me: convert(locut + thistimecnt + hicut, tzh.tzh_timecnt); This also seems like it's making dubious assumptions about how signed and possibly-unsigned values will mix. regards, tom lane [1] https://www.postgresql.org/message-id/20190719035347.GJ1859@paquier.xyz

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[PROPOSED] HKWT observed in late 1941 in Hong Kong
by Paul Eggert July 12, 2019

July 12, 2019

* NEWS: Mention this. * asia (Asia/Hong_Kong): Treat the period from 1941-10-01 to 1941-12-25 as 30-minute DST rather than as standard time. * theory.html (Time zone abbreviations): Add HKWT. --- NEWS | 5 +++++ asia | 19 ++++++++++++++----- theory.html | 2 +- 3 files changed, 20 insertions(+), 6 deletions(-) diff --git a/NEWS b/NEWS index 65c67a2..e2ebe32 100644 --- a/NEWS +++ b/NEWS @@ -12,6 +12,11 @@ Unreleased, experimental changes Fix several errors in pre-1970 transitions in Perry County, IN. (Thanks to Alois Triendl for pointing out the 1967/9 errors.) + Changes to past time zone abbreviations and DST flags + + Hong Kong Winter Time, observed from 1941-10-01 to 1941-12-25, + is now flagged as DST and is abbreviated HKWT not HKT. + Changes to commentary Nashville's newspapers dueled about the time of day in the 1950s. diff --git a/asia b/asia index 348e2b5..47a0b25 100644 --- a/asia +++ b/asia @@ -8,7 +8,7 @@ # tz(a)iana.org for general use in the future). For more, please see # the file CONTRIBUTING in the tz distribution. -# From Paul Eggert (2018-06-19): +# From Paul Eggert (2019-07-11): # # Unless otherwise specified, the source for data through 1990 is: # Thomas G. Shanks and Rique Pottenger, The International Atlas (6th edition), @@ -47,13 +47,13 @@ # 7:00 WIB west Indonesia (Waktu Indonesia Barat) # 8:00 WITA central Indonesia (Waktu Indonesia Tengah) # 8:00 CST China -# 8:00 PST PDT* Philippine Standard Time +# 8:00 HKT HKST Hong Kong (HKWT* for Winter Time in late 1941) +# 8:00 PST PDT* Philippines # 8:30 KST KDT Korea when at +0830 # 9:00 WIT east Indonesia (Waktu Indonesia Timur) # 9:00 JST JDT Japan # 9:00 KST KDT Korea when at +09 -# 9:30 ACST Australian Central Standard Time -# *I invented the abbreviation PDT; see "Philippines" below. +# *I invented the abbreviations HKWT and PDT; see below. # Otherwise, these tables typically use numeric abbreviations like +03 # and +0330 for integer hour and minute UT offsets. Although earlier # editions invented alphabetic time zone abbreviations for every @@ -653,6 +653,15 @@ Zone Asia/Urumqi 5:50:20 - LMT 1928 # * 1941-09-30, Hong Kong Daily Press, Winter Time Warning. # https://i.imgur.com/dge4kFJ.png +# From Paul Eggert (2019-07-11): +# "Hong Kong winter time" is considered to be daylight saving. +# "Hong Kong had adopted daylight saving on June 15 as a wartime measure, +# clocks moving forward one hour until October 1, when they would be put back +# by just half an hour for 'Hong Kong Winter time', so that daylight saving +# operated year round." -- Low Z. The longest day: when wartime Hong Kong +# introduced daylight saving. South China Morning Post. 2019-06-28. +# https://www.scmp.com/magazines/post-magazine/short-reads/article/3016281/lo… + # From P Chan (2018-12-31): # * According to the Hong Kong Daylight-Saving Regulations, 1941, the # 1941 spring-forward transition was at 03:00. @@ -754,7 +763,7 @@ Rule HK 1979 only - Oct 21 3:30 0 - Zone Asia/Hong_Kong 7:36:42 - LMT 1904 Oct 30 0:36:42 8:00 - HKT 1941 Jun 15 3:00 8:00 1:00 HKST 1941 Oct 1 4:00 - 8:30 - HKT 1941 Dec 25 + 8:00 0:30 HKWT 1941 Dec 25 9:00 - JST 1945 Nov 18 2:00 8:00 HK HK%sT diff --git a/theory.html b/theory.html index e0b3233..1e7df4a 100644 --- a/theory.html +++ b/theory.html @@ -428,7 +428,7 @@ in decreasing order of importance: EET/EEST Eastern European, GST/GDT Guam, HST/HDT/HWT/HPT Hawaii, - HKT/HKST Hong Kong, + HKT/HKST/HKWT Hong Kong, IST India, IST/GMT Irish, IST/IDT/IDDT Israel, -- 2.17.1

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Re: [tz] zone America/Indiana/Tell_city 1967 - 1969
by Paul Eggert July 11, 2019

July 11, 2019

Michael H Deckers wrote: > -Rule Perry 1960 only - Oct lastSun 2:00 0 S Thanks for catching that typo; I installed the attached.

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