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africa: Egypt resumes DST on May 15

Browse Source 
(Thanks to Ahmad El-Dardiry.)
* NEWS: Document this.
* africa (Egypt): Add rules for 2014 through 2038.  They all
involve some guesswork, unfortunately.
This commit is contained in:
Paul Eggert
2014-05-07 18:09:14 -07:00
parent ebd01ad62e
commit c9ebcee69b
2 changed files with 51 additions and 0 deletions
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10
NEWS
View File

@@ -3,6 +3,16 @@ News for the tz database
Unreleased, experimental changes
Changes affecting near-future time stamps
Egypt observes DST starting May 15. (Thanks to Ahmad El-Dardiry.)
Details have not been announced, except that DST will not be observed
during Ramadan. Guess that DST will stop during the same Ramadan dates as
Morocco, and that Egypt's future spring and fall transitions will be the
same as 2010 when it last observed DST, namely April's last Friday at
00:00 to September's last Thursday at 23:00 standard time. Also, guess
that Ramadan transitions will be at 00:00 standard time.
Changes affecting code
zic now generates transitions for minimum time values, eliminating guesswork

41
africa
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@@ -335,11 +335,52 @@ Rule Egypt 2007 only - Sep Thu>=1 23:00s 0 -
# http://www.worldtimezone.com/dst_news/dst_news_egypt02.html
# </a>
# From Ahmad El-Dardiry (2014-05-07):
# Egypt is to change back to Daylight system on May 15
# http://english.ahram.org.eg/NewsContent/1/64/100735/Egypt/Politics-/Egypts-government-to-reapply-daylight-saving-time-.aspx
# From Paul Eggert (2014-05-07):
# Sarah El Deeb and Lee Keath of AP report that the Egyptian government says
# the change is because of blackouts in Cairo, even though Ahram Online (cited
# above) says DST had no affect on electricity consumption. The AP story says
# DST will not be observed during Ramadan. There is no information about when
# DST will end. See:
# http://abcnews.go.com/International/wireStory/el-sissi-pushes-egyptians-line-23614833
#
# For now, assume DST will start at 00:00 on May 15, and guess that in future
# years DST will start and end using the same rules as 2010, and guess that
# Egypt will agree with Morocco (see below) about the date Ramadan starts and
# ends, though (unlike Morocco) it will switch at 00:00 standard time. In
# Egypt the spring-forward transitions are removed for 2020-2022, when the
# guessed spring-forward date falls during the estimated Ramadan, and all
# transitions removed for 2023-2038, where the estimated Ramadan falls entirely
# outside the guessed daylight-saving time. Ramadan intrudes on the guessed
# DST starting in 2039, but that's beyond our somewhat-arbitrary cutoff.
Rule Egypt 2008 only - Aug lastThu 23:00s 0 -
Rule Egypt 2009 only - Aug 20 23:00s 0 -
Rule Egypt 2010 only - Aug 11 0:00 0 -
Rule Egypt 2010 only - Sep 10 0:00 1:00 S
Rule Egypt 2010 only - Sep lastThu 23:00s 0 -
Rule Egypt 2014 only - May 15 0:00s 1:00 S
Rule Egypt 2014 only - Jun 29 0:00s 0 -
Rule Egypt 2014 only - Jul 29 0:00s 1:00 S
Rule Egypt 2014 max - Sep lastThu 23:00s 0 -
Rule Egypt 2015 2019 - Apr lastFri 0:00s 1:00 S
Rule Egypt 2015 only - Jun 18 0:00s 0 -
Rule Egypt 2015 only - Jul 18 0:00s 1:00 S
Rule Egypt 2016 only - Jun 7 0:00s 0 -
Rule Egypt 2016 only - Jul 7 0:00s 1:00 S
Rule Egypt 2017 only - May 27 0:00s 0 -
Rule Egypt 2017 only - Jun 26 0:00s 1:00 S
Rule Egypt 2018 only - May 16 0:00s 0 -
Rule Egypt 2018 only - Jun 15 0:00s 1:00 S
Rule Egypt 2019 only - May 6 0:00s 0 -
Rule Egypt 2019 only - Jun 5 0:00s 1:00 S
Rule Egypt 2020 only - May 24 0:00s 1:00 S
Rule Egypt 2021 only - May 13 0:00s 1:00 S
Rule Egypt 2022 only - May 3 0:00s 1:00 S
Rule Egypt 2023 max - Apr lastFri 0:00s 1:00 S
# Zone NAME GMTOFF RULES FORMAT [UNTIL]
Zone Africa/Cairo 2:05:09 - LMT 1900 Oct