- tz - lists.iana.org

Brazil moves DST start to November
by Steffen Thorsen Jan. 17, 2018

Jan. 17, 2018

According to many media sources, next year's DST start in Brazil will move to the first Sunday of November, and it will stay like that for the years after. Some examples in Portugese: https://noticias.r7.com/economia/por-eleicao-temer-reduz-periodo-de-horario… https://exame.abril.com.br/brasil/por-eleicao-temer-reduz-periodo-de-horari… We have made a brief English summary: https://www.timeanddate.com/news/time/brazil-delays-dst-2018.html Best regards, Steffen Thorsen - timeanddate.com

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Canada/East-Saskatchewan
by Derick Rethans Jan. 16, 2018

Jan. 16, 2018

Hi, I saw that the PHP build with the new timezone database (2017.3) failed due to Canada/East-Saskatchewan suddenly being gone. What's up with that? https://travis-ci.org/php/php-src/jobs/291636544#L1280 cheers, Derick -- https://derickrethans.nl | https://xdebug.org | https://dram.io Like Xdebug? Consider a donation: https://xdebug.org/donate.php twitter: @derickr and @xdebug

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leap-seconds.list file is out of date
by R. Bonomi Jan. 15, 2018

Jan. 15, 2018

The iana.org file only contains info through Bulletin C54, but Bulletin C55 is out. Reference: the leap-seconds.list file at usno.mil

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Mongolian time zone.
by Phake Nick Jan. 13, 2018

Jan. 13, 2018

Currently, tz database say Mongolia use UTC+7/8/9 as timezone. However, after quick google search, I found a question about time of Mongolia in a Mongolia question and answer time at [1]. The page itself is facing technical problem to me so I accessed it via Google cache which I subsequently thrown the cache into Google translate and archived the result at [2]. According to the page from 2016, three different users of the site answered the question with same answer, and all of them are saying Mongolia have three different timezone: 6, 7, 8. This is different from the information recorded in tz database. So, is the information in tz database incorrect? And then, another question on the site [3] (archived in [4]) asked about when did Mongolia start officially using the world time and someone answered since 1997. What does that mean? (On the other hand, another answer to a similar question say 1961... [5][6] or is that an error in machine translation?) [1]: http://acyy.mn/3379/монгол-улс-хэд-хэддүгээр-цагын-бүсэд-оршдог-вэ [2]: http://archive.is/y3jpH [3]: http://acyy.mn/8620/монгол-хэдэн-оноос-дэлхийн-бүсийн-цагийг-хэрэглэж-эхлэс… [4]: http://archive.is/PQBVk [5]: http://acyy.mn/7379/му-хэдэн-оноос-дэлхийн-цагийг-баримтлах-болсон-бэ [6]: http://archive.is/e39nW

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Sao Tome Principe change of time zone
by Steffen Thorsen Jan. 9, 2018

Jan. 9, 2018

Multiple sources tell that Sao Tome changed from UTC to UTC+1 as they entered the year 2018: https://www.dn.pt/lusa/interior/relogios-avancam-uma-hora-em-sao-tome-e-pri… http://pt.rfi.fr/sao-tome-e-principe/20180101-sao-tome-e-principe-muda-de-h… http://www.stp-press.st/2017/12/23/sao-tome-e-principe-vai-mudar-hora-a-par… So it seems the Africa/Sao_Tome zone needs to activated again! Our English summary: https://www.timeanddate.com/news/time/sao-tome-principe-time-zone-change.ht… Best regards, Steffen Thorsen - timeanddate.com

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[PATCH] * northamerica: Add note re Chicago time before 1883.
by Paul Eggert Jan. 8, 2018

Jan. 8, 2018

--- northamerica | 12 ++++++++++++ 1 file changed, 12 insertions(+) diff --git a/northamerica b/northamerica index 505300a..a014126 100644 --- a/northamerica +++ b/northamerica @@ -348,6 +348,18 @@ Zone America/New_York -4:56:02 - LMT 1883 Nov 18 12:03:58 # Nebraska, eastern North Dakota, Oklahoma, eastern South Dakota, # western Tennessee, most of Texas, Wisconsin +# From Paul Eggert (2018-01-07): +# In 1869 the Chicago Astronomical Society contracted with the city to keep +# time. Though delayed by the Great Fire, by 1880 a wire ran from the +# Dearborn Observatory (on the University of Chicago campus) to City Hall, +# which then sent signals to police and fire stations. However, railroads got +# their time signals from the Allegheny Observatory, the Madison Observatory, +# the Ann Arbor Observatory, etc., so their clocks did not agree with each +# other or with the city's official time. The confusion took some years to +# clear up. See: +# Moser M. How Chicago gave America its time zones. Chicago. 2018-01-04. +# http://www.chicagomag.com/city-life/January-2018/How-Chicago-Gave-America-I… + # From Larry M. Smith (2006-04-26) re Wisconsin: # https://docs.legis.wisconsin.gov/statutes/statutes/175.pdf # is currently enforced at the 01:00 time of change. Because the local -- 2.7.4

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Three time zones meeting at one location
by Paul Eggert Dec. 29, 2017

Dec. 29, 2017

In yesterday's My Modern Met, Jessica Stewart says that in over 20 locations in the world, three different time zones converge. Surveyor Generals Corner in Australia and Treriksrøysa (for the point where Finland, Norway, and Russia meet) are two examples. For time zone hounds it may be an amusing read, if only to spot the mistakes. Stewart J. Places around the world where three time zones meet in the same spot. My Modern Met. 2017-12-28. https://mymodernmet.com/three-different-time-zones-facts/

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Lithuania calls on EU to stop adjusting clocks for daylight savings
by Lord Buddha Dec. 23, 2017

Dec. 23, 2017

https://www.theguardian.com/world/2017/dec/22/lithuania-calls-on-eu-to-stop…

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Transitions after those included in zoneinfo binaries?
by Paul G Dec. 21, 2017

Dec. 21, 2017

I recently noticed a discrepancy between the python-dateutil and pytz libraries when calculating offsets for dates after the last included transition in the zonefile binaries. What it boils down to is that when it runs out of transitions, python-dateutil selects the "standard" offset and pytz assumes that after the last transition the value "holds". In the southern hemisphere, this produces two different behaviors. Obviously there's no "right" answer here, since these are predictions about what time zones will be applied 20 years in the future (and even if the rules stayed the same, the "end date" is entirely artificial). Still, I wonder if it might be worth a bit of discussion and possibly a note in the Theory file? Barring a representation of the data that exposes the rules directly (in which case no such artificial limitation would be necessary), I think either fallback is defensible. Best, Paul

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Complexities of time rendered graphically
by Steve Jones Dec. 19, 2017

Dec. 19, 2017

Folks: Today's XKCD comic is amusing: https://xkcd.com/1930/ Steve Jones [image: Emacs!]

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