Permalink
Browse files

Estimate Morocco 2013-2038 transitions for Ramadan.

* africa (Morocco): Use GNU Emacs 24.3 to estimate Ramadan-based
DST transition dates for 2013-2038.  Heads-up by Erik Homoet in
<http://mm.icann.org/pipermail/tz/2013-February/018680.html>.
  • Loading branch information...
1 parent 0fdbcdc commit 95e6f814bb120906d03f506fe18c2cdf3a9dfa78 @eggert committed Mar 7, 2013
Showing with 54 additions and 1 deletion.
  1. +54 −1 africa
View
55 africa
@@ -846,6 +846,41 @@ Zone Indian/Mayotte 3:00:56 - LMT 1911 Jul # Mamoutzou
# 3:00 am Friday, July 20, 2012 and will again be advanced by 60 minutes
# August 20, 2012 from 2:00 am.
+# From Paul Eggert (2013-03-06):
+# Morocco's daylight-saving transitions due to Ramadan seem to be
+# announced a bit in advance. On 2012-07-11 the Moroccan government
+# announced that year's Ramadan daylight-saving transitions would be
+# 2012-07-20 and 2012-08-20; see
+# <http://www.mmsp.gov.ma/fr/actualites.aspx?id=288>.
+#
+# To estimate what the Moroccan government will do in future years,
+# transition dates for 2013 through 2021 were determined by running
+# the following program under GNU Emacs 24.3:
+#
+# (let ((islamic-year 1434))
+# (while (< islamic-year 1444)
+# (let ((a
+# (calendar-gregorian-from-absolute
+# (calendar-islamic-to-absolute (list 9 1 islamic-year))))
+# (b
+# (calendar-gregorian-from-absolute
+# (calendar-islamic-to-absolute (list 10 1 islamic-year)))))
+# (insert
+# (format
+# (concat "Rule\tMorocco\t%d\tonly\t-\t%s\t %2d\t 3:00\t0\t-\n"
+# "Rule\tMorocco\t%d\tonly\t-\t%s\t %2d\t 2:00\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))))
+#
+# with the results hand-edited for 2020-2022, when the normal spring-forward
+# date falls during the estimated Ramadan.
+#
+# From 2023 through 2038 Ramadan is not predicted to overlap with
+# daylight saving time. Starting in 2039 there will be overlap again,
+# but 32-bit time_t values roll around in 2038 so for now do not worry
+# about dates after 2038.
+
# RULE NAME FROM TO TYPE IN ON AT SAVE LETTER/S
Rule Morocco 1939 only - Sep 12 0:00 1:00 S
@@ -871,10 +906,28 @@ Rule Morocco 2010 only - May 2 0:00 1:00 S
Rule Morocco 2010 only - Aug 8 0:00 0 -
Rule Morocco 2011 only - Apr 3 0:00 1:00 S
Rule Morocco 2011 only - Jul 31 0 0 -
-Rule Morocco 2012 max - Apr lastSun 2:00 1:00 S
+Rule Morocco 2012 2019 - Apr lastSun 2:00 1:00 S
Rule Morocco 2012 max - Sep lastSun 3:00 0 -
Rule Morocco 2012 only - Jul 20 3:00 0 -
Rule Morocco 2012 only - Aug 20 2:00 1:00 S
+Rule Morocco 2013 only - Jul 9 3:00 0 -
+Rule Morocco 2013 only - Aug 8 2:00 1:00 S
+Rule Morocco 2014 only - Jun 29 3:00 0 -
+Rule Morocco 2014 only - Jul 29 2:00 1:00 S
+Rule Morocco 2015 only - Jun 18 3:00 0 -
+Rule Morocco 2015 only - Jul 18 2:00 1:00 S
+Rule Morocco 2016 only - Jun 7 3:00 0 -
+Rule Morocco 2016 only - Jul 7 2:00 1:00 S
+Rule Morocco 2017 only - May 27 3:00 0 -
+Rule Morocco 2017 only - Jun 26 2:00 1:00 S
+Rule Morocco 2018 only - May 16 3:00 0 -
+Rule Morocco 2018 only - Jun 15 2:00 1:00 S
+Rule Morocco 2019 only - May 6 3:00 0 -
+Rule Morocco 2019 only - Jun 5 2:00 1:00 S
+Rule Morocco 2020 only - May 24 2:00 1:00 S
+Rule Morocco 2021 only - May 13 2:00 1:00 S
+Rule Morocco 2022 only - May 3 2:00 1:00 S
+Rule Morocco 2023 max - Apr lastSun 2:00 1:00 S
# Zone NAME GMTOFF RULES FORMAT [UNTIL]
Zone Africa/Casablanca -0:30:20 - LMT 1913 Oct 26

0 comments on commit 95e6f81

Please sign in to comment.