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Egypt canceled DST on short notice
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* NEWS: Document this.
* africa (Egypt): Revert recent DST changes.
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@eggert
eggert committed Jul 5, 2016
1 parent 2577681 commit 868f352
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4 changes: 4 additions & 0 deletions NEWS
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Expand Up @@ -4,6 +4,10 @@ Unreleased, experimental changes

Changes affecting future time stamps

The Egyptian government changed its mind on short notice, and
Africa/Cairo will not introduce DST starting 2016-07-07 after all.
(Thanks to Mina Samuel.)

Asia/Novosibirsk switches from +06 to +07 on 2016-07-24 at 02:00.
(Thanks to Stepan Golosunov.)

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84 changes: 2 additions & 82 deletions africa
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Expand Up @@ -346,41 +346,8 @@ Rule Egypt 2007 only - Sep Thu>=1 24:00 0 -
# From Steffen Thorsen (2016-04-29):
# Egypt will have DST from July 7 until the end of October....
# http://english.ahram.org.eg/NewsContentP/1/204655/Egypt/Daylight-savings-time-returning-to-Egypt-on--July.aspx
# http://www.nileinternational.net/en/?p=25806
# ... EgyptAir seems to have assumed DST to start in April (like it previously
# did in 2010), and therefore this obviously causes problems with the schedules:
# http://www.egyptair.com/en/about-egyptair/news-and-press/Pages/CANCELLATION%20OF%20DAYLIGHT%20SAVING%20TIME.aspx
#
# From Paul Eggert (2016-04-29):
# For now, guess fall transitions will be October's last Thursday at
# 24:00 and spring transitions will follow rules used 1995-2010 and be
# April's last Thursday at 24:00, and guess a switch to standard time at
# 24:00 the last Thursday before Ramadan, and back to DST at 00:00 the
# first Friday after Ramadan. To implement this,
# transition dates for 2016 through 2068 were determined by running
# the following program under GNU Emacs 24.5, with the results integrated
# by hand into the table below. Ramadan again intrudes on the guessed
# DST starting in 2069, but that's beyond our somewhat-arbitrary cutoff here.
# (let ((islamic-year 1437))
# (while (< islamic-year 1491)
# (let ((a (calendar-islamic-to-absolute (list 9 1 islamic-year)))
# (b (calendar-islamic-to-absolute (list 10 1 islamic-year)))
# (friday 5))
# (while (/= friday (mod a 7))
# (setq a (1- a)))
# (while (/= friday (mod b 7))
# (setq b (1+ b)))
# (setq a (1- a))
# (setq b (1- b))
# (setq a (calendar-gregorian-from-absolute a))
# (setq b (calendar-gregorian-from-absolute b))
# (insert
# (format
# (concat "Rule\tEgypt\t%d\tonly\t-\t%s\t%2d\t24:00\t0\t-\n"
# "Rule\tEgypt\t%d\tonly\t-\t%s\t%2d\t24:00\t1:00\tS\n")
# (car (cdr (cdr a))) (calendar-month-name (car a) t) (car (cdr a))
# (car (cdr (cdr b))) (calendar-month-name (car b) t) (car (cdr b)))))
# (setq islamic-year (+ 1 islamic-year))))
# From Mina Samuel (2016-07-04):
# Egyptian government took the decision to cancel the DST,

Rule Egypt 2008 only - Aug lastThu 24:00 0 -
Rule Egypt 2009 only - Aug 20 24:00 0 -
Expand All @@ -391,53 +358,6 @@ Rule Egypt 2014 only - May 15 24:00 1:00 S
Rule Egypt 2014 only - Jun 26 24:00 0 -
Rule Egypt 2014 only - Jul 31 24:00 1:00 S
Rule Egypt 2014 only - Sep lastThu 24:00 0 -
Rule Egypt 2016 only - Jul 7 24:00 1:00 S
Rule Egypt 2016 2035 - Oct lastThu 24:00 0 -
Rule Egypt 2017 2019 - Apr lastThu 24:00 1:00 S
Rule Egypt 2017 only - May 25 24:00 0 -
Rule Egypt 2017 only - Jun 29 24:00 1:00 S
Rule Egypt 2018 only - May 10 24:00 0 -
Rule Egypt 2018 only - Jun 14 24:00 1:00 S
Rule Egypt 2019 only - May 2 24:00 0 -
Rule Egypt 2019 only - Jun 6 24:00 1:00 S
Rule Egypt 2020 only - May 28 24:00 1:00 S
Rule Egypt 2021 only - May 13 24:00 1:00 S
Rule Egypt 2022 only - May 5 24:00 1:00 S
Rule Egypt 2023 2051 - Apr lastThu 24:00 1:00 S
Rule Egypt 2036 only - Oct 16 24:00 0 -
Rule Egypt 2037 only - Oct 8 24:00 0 -
Rule Egypt 2038 only - Sep 23 24:00 0 -
Rule Egypt 2039 only - Sep 15 24:00 0 -
Rule Egypt 2039 only - Oct 20 24:00 1:00 S
Rule Egypt 2039 max - Oct lastThu 24:00 0 -
Rule Egypt 2040 only - Sep 6 24:00 0 -
Rule Egypt 2040 only - Oct 11 24:00 1:00 S
Rule Egypt 2041 only - Aug 22 24:00 0 -
Rule Egypt 2041 only - Sep 26 24:00 1:00 S
Rule Egypt 2042 only - Aug 14 24:00 0 -
Rule Egypt 2042 only - Sep 18 24:00 1:00 S
Rule Egypt 2043 only - Aug 6 24:00 0 -
Rule Egypt 2043 only - Sep 10 24:00 1:00 S
Rule Egypt 2044 only - Jul 21 24:00 0 -
Rule Egypt 2044 only - Aug 25 24:00 1:00 S
Rule Egypt 2045 only - Jul 13 24:00 0 -
Rule Egypt 2045 only - Aug 17 24:00 1:00 S
Rule Egypt 2046 only - Jun 28 24:00 0 -
Rule Egypt 2046 only - Aug 9 24:00 1:00 S
Rule Egypt 2047 only - Jun 20 24:00 0 -
Rule Egypt 2047 only - Jul 25 24:00 1:00 S
Rule Egypt 2048 only - Jun 11 24:00 0 -
Rule Egypt 2048 only - Jul 16 24:00 1:00 S
Rule Egypt 2049 only - May 27 24:00 0 -
Rule Egypt 2049 only - Jul 1 24:00 1:00 S
Rule Egypt 2050 only - May 19 24:00 0 -
Rule Egypt 2050 only - Jun 23 24:00 1:00 S
Rule Egypt 2051 only - May 11 24:00 0 -
Rule Egypt 2051 only - Jun 15 24:00 1:00 S
Rule Egypt 2052 only - May 30 24:00 1:00 S
Rule Egypt 2053 only - May 22 24:00 1:00 S
Rule Egypt 2054 only - May 14 24:00 1:00 S
Rule Egypt 2055 max - Apr lastThu 24:00 1:00 S

# Zone NAME GMTOFF RULES FORMAT [UNTIL]
Zone Africa/Cairo 2:05:09 - LMT 1900 Oct
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