MFC of 283079,tzdata10:

Update to tzdata2015d:

Release 2015d - 2015-04-24 08:09:46 -0700

  Changes affecting future time stamps

    Egypt will not observe DST in 2015 and will consider canceling it
    permanently.  For now, assume no DST indefinitely.
    (Thanks to Ahmed Nazmy and Tim Parenti.)

  Change affecting past and future time zone abbreviations

    The abbreviations for Hawaii-Aleutian standard and daylight times
    have been changed from HAST/HADT to HST/HDT, as per US Government
    Printing Office style.  This affects only America/Adak since 1983,
    as America/Honolulu was already using the new style.

2 files changed, 130 insertions, 57 deletions

diff --git a/contrib/tzdata/africa b/contrib/tzdata/africa
index 8b9ee61..ea0171a 100644
--- a/contrib/tzdata/africa
+++ b/contrib/tzdata/africa
@@ -328,35 +328,20 @@ Rule	Egypt	2007	only	-	Sep	Thu>=1	24:00	0	-
 # http://almogaz.com/news/weird-news/2015/04/05/1947105 ...
 # http://www.timeanddate.com/news/time/egypt-starts-dst-2015.html
 
-# From Paul Eggert (2015-04-08):
-# For now, guess that later spring and fall transitions will use
-# 2014's rules, and guess that Egypt will 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 2015 through 2037 were determined by running
-# the following program under GNU Emacs 24.4, with the results integrated
-# by hand into the table below.  Ramadan again intrudes on the guessed
-# DST starting in 2038, but that's beyond our somewhat-arbitrary cutoff.
-# (let ((islamic-year 1436))
-#   (while (< islamic-year 1460)
-#     (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 Ahmed Nazmy (2015-04-20):
+# Egypt's ministers cabinet just announced ... that it will cancel DST at
+# least for 2015.
+#
+# From Tim Parenti (2015-04-20):
+# http://english.ahram.org.eg/WriterArticles/NewsContentP/1/128195/Egypt/No-daylight-saving-this-summer-Egypts-prime-minist.aspx
+# "Egypt's cabinet agreed on Monday not to switch clocks for daylight saving
+# time this summer, and carry out studies on the possibility of canceling the
+# practice altogether in future years."
+#
+# From Paul Eggert (2015-04-20):
+# For now, assume DST will be canceled.  Any resumption would likely
+# use different rules anyway.
+
 Rule	Egypt	2008	only	-	Aug	lastThu	24:00	0	-
 Rule	Egypt	2009	only	-	Aug	20	24:00	0	-
 Rule	Egypt	2010	only	-	Aug	10	24:00	0	-
@@ -365,22 +350,7 @@ Rule	Egypt	2010	only	-	Sep	lastThu	24:00	0	-
 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	max	-	Sep	lastThu	24:00	0	-
-Rule	Egypt	2015	2019	-	Apr	lastThu	24:00	1:00	S
-Rule	Egypt	2015	only	-	Jun	11	24:00	0	-
-Rule	Egypt	2015	only	-	Jul	23	24:00	1:00	S
-Rule	Egypt	2016	only	-	Jun	 2	24:00	0	-
-Rule	Egypt	2016	only	-	Jul	 7	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	max	-	Apr	lastThu	24:00	1:00	S
+Rule	Egypt	2014	only	-	Sep	lastThu	24:00	0	-
 
 # Zone	NAME		GMTOFF	RULES	FORMAT	[UNTIL]
 Zone	Africa/Cairo	2:05:09 -	LMT	1900 Oct
diff --git a/contrib/tzdata/northamerica b/contrib/tzdata/northamerica
index debc7dc..c3af9eb 100644
--- a/contrib/tzdata/northamerica
+++ b/contrib/tzdata/northamerica
@@ -227,9 +227,14 @@ Zone	PST8PDT		 -8:00	US	P%sT
 # The law doesn't give abbreviations.
 #
 # From Paul Eggert (2000-01-08), following a heads-up from Rives McDow:
-# Public law 106-564 (2000-12-23) introduced the abbreviation
-# "Chamorro Standard Time" for time in Guam and the Northern Marianas.
-# See the file "australasia".
+# Public law 106-564 (2000-12-23) introduced ... "Chamorro Standard Time"
+# for time in Guam and the Northern Marianas.  See the file "australasia".
+#
+# From Paul Eggert (2015-04-17):
+# HST and HDT are standardized abbreviations for Hawaii-Aleutian
+# standard and daylight times.  See section 9.47 (p 234) of the
+# U.S. Government Printing Office Style Manual (2008)
+# http://www.gpo.gov/fdsys/pkg/GPO-STYLEMANUAL-2008/pdf/GPO-STYLEMANUAL-2008.pdf
 
 # From Arthur David Olson, 2005-08-09
 # The following was signed into law on 2005-08-08.
@@ -536,7 +541,7 @@ Zone America/Adak	 12:13:21 -	LMT	1867 Oct 18
 			-11:00	-	BST	1969
 			-11:00	US	B%sT	1983 Oct 30  2:00
 			-10:00	US	AH%sT	1983 Nov 30
-			-10:00	US	HA%sT
+			-10:00	US	H%sT
 # The following switches don't quite make our 1970 cutoff.
 #
 # Shanks writes that part of southwest Alaska (e.g. Aniak)
@@ -1841,17 +1846,115 @@ Zone America/Creston	-7:46:04 -	LMT	1884
 # Dawson switched to PST in 1973.  Inuvik switched to MST in 1979.
 # Mathew Englander (1996-10-07) gives the following refs:
 #	* 1967. Paragraph 28(34)(g) of the Interpretation Act, S.C. 1967-68,
-#	c. 7 defines Yukon standard time as UTC-9.  This is still valid;
+#	c. 7 defines Yukon standard time as UTC-9....
 #	see Interpretation Act, R.S.C. 1985, c. I-21, s. 35(1).
+#	[http://canlii.ca/t/7vhg]
 #	* C.O. 1973/214 switched Yukon to PST on 1973-10-28 00:00.
 #	* O.I.C. 1980/02 established DST.
 #	* O.I.C. 1987/056 changed DST to Apr firstSun 2:00 to Oct lastSun 2:00.
-# Shanks & Pottenger say Yukon's 1973-10-28 switch was at 2:00; go
-# with Englander.
-# From Chris Walton (2006-06-26):
-# Here is a link to the old daylight saving portion of the interpretation
-# act which was last updated in 1987:
-# http://www.gov.yk.ca/legislation/regs/oic1987_056.pdf
+
+# From Brian Inglis (2015-04-14):
+#
+# I tried to trace the history of Yukon time and found the following
+# regulations, giving the reference title and URL if found, regulation name,
+# and relevant quote if available.  Each regulation specifically revokes its
+# predecessor.  The final reference is to the current Interpretation Act
+# authorizing and resulting from these regulatory changes.
+#
+# Only recent regulations were retrievable via Yukon government site search or
+# index, and only some via Canadian legal sources.  Other sources used include
+# articles titled "Standard Time and Time Zones in Canada" from JRASC via ADS
+# Abstracts, cited by ADO for 1932 ..., and updated versions from 1958 and
+# 1970 quoted below; each article includes current extracts from provincial
+# and territorial ST and DST regulations at the end, summaries and details of
+# standard times and daylight saving time at many locations across Canada,
+# with time zone maps, tables and calculations for Canadian Sunrise, Sunset,
+# and LMST; they also cover many countries and global locations, with a chart
+# and table showing current Universal Time offsets, and may be useful as
+# another source of information for 1970 and earlier.
+#
+# * Standard Time and Time Zones in Canada; Smith, C.C.; JRASC, Vol. 26,
+#   pp.49-77; February 1932; SAO/NASA Astrophysics Data System (ADS)
+#   http://adsabs.harvard.edu/abs/1932JRASC..26...49S from p.75:
+#   Yukon Interpretation Ordinance
+#   Yukon standard time is the local mean time at the one hundred and
+#   thirty-fifth meridian.
+#
+# * Standard Time and Time Zones in Canada; Smith, C.C.; Thomson, Malcolm M.;
+#   JRASC, Vol. 52, pp.193-223; October 1958; SAO/NASA Astrophysics Data System
+#   (ADS) http://adsabs.harvard.edu/abs/1958JRASC..52..193S from pp.220-1:
+#   Yukon Interpretation Ordinance, 1955, Chap. 16.
+#
+#     (1) Subject to this section, standard time shall be reckoned as nine
+#     hours behind Greenwich Time and called Yukon Standard Time.
+#
+#     (2) Notwithstanding subsection (1), the Commissioner may make regulations
+#     varying the manner of reckoning standard time.
+#
+# * Yukon Territory Commissioner's Order 1966-20 Interpretation Ordinance
+#   http://? - no online source found
+#
+# * Standard Time and Time Zones in Canada; Thomson, Malcolm M.; JRASC,
+#   Vol. 64, pp.129-162; June 1970; SAO/NASA Astrophysics Data System (ADS)
+#   http://adsabs.harvard.edu/abs/1970JRASC..64..129T from p.156: Yukon
+#   Territory Commissioner's Order 1967-59 Interpretation Ordinance ...
+#
+#     1. Commissioner's Order 1966-20 dated at Whitehorse in the Yukon
+#     Territory on 27th January, 1966, is hereby revoked.
+#
+#     2. Yukon (East) Standard Time as defined by section 36 of the
+#     Interpretation Ordinance from and after mid-night on the 28th day of May,
+#     1967 shall be reckoned in the same manner as Pacific Standard Time, that
+#     is to say, eight hours behind Greenwich Time in the area of the Yukon
+#     Territory lying east of the 138th degree longitude west.
+#
+#     3. In the remainder of the Territory, lying west of the 138th degree
+#     longitude west, Yukon (West) Standard Time shall be reckoned as nine
+#     hours behind Greenwich Time.
+#
+# * Yukon Standard Time defined as Pacific Standard Time, YCO 1973/214
+#   http://www.canlii.org/en/yk/laws/regu/yco-1973-214/latest/yco-1973-214.html
+#   C.O. 1973/214 INTERPRETATION ACT ...
+#
+#     1. Effective October 28, 1973 Commissioner's Order 1967/59 is hereby
+#     revoked.
+#
+#     2. Yukon Standard Time as defined by section 36 of the Interpretation
+#     Act from and after midnight on the twenty-eighth day of October, 1973
+#     shall be reckoned in the same manner as Pacific Standard Time, that is
+#     to say eight hours behind Greenwich Time.
+#
+# * O.I.C. 1980/02 INTERPRETATION ACT
+#   http://? - no online source found
+#
+# * Yukon Daylight Saving Time, YOIC 1987/56
+#   http://www.canlii.org/en/yk/laws/regu/yoic-1987-56/latest/yoic-1987-56.html
+#   O.I.C. 1987/056 INTERPRETATION ACT ...
+#
+#   In every year between
+#     (a) two o'clock in the morning in the first Sunday in April, and
+#     (b) two o'clock in the morning in the last Sunday in October,
+#   Standard Time shall be reckoned as seven hours behind Greenwich Time and
+#   called Yukon Daylight Saving Time.
+#   ...
+#   Dated ... 9th day of March, A.D., 1987.
+#
+# * Yukon Daylight Saving Time 2006, YOIC 2006/127
+#   http://www.canlii.org/en/yk/laws/regu/yoic-2006-127/latest/yoic-2006-127.html
+#   O.I.C. 2006/127 INTERPRETATION ACT ...
+#
+#     1. In Yukon each year the time for general purposes shall be 7 hours
+#     behind Greenwich mean time during the period commencing at two o'clock
+#     in the forenoon on the second Sunday of March and ending at two o'clock
+#     in the forenoon on the first Sunday of November and shall be called
+#     Yukon Daylight Saving Time.
+#
+#     2. Order-in-Council 1987/56 is revoked.
+#
+#     3. This order comes into force January 1, 2007.
+#
+# * Interpretation Act, RSY 2002, c 125
+# http://www.canlii.org/en/yk/laws/stat/rsy-2002-c-125/latest/rsy-2002-c-125.html
 
 # From Rives McDow (1999-09-04):
 # Nunavut ... moved ... to incorporate the whole territory into one time zone.
@@ -2077,7 +2180,7 @@ Zone America/Inuvik	0	-	zzz	1953 # Inuvik founded
 			-7:00	NT_YK	M%sT	1980
 			-7:00	Canada	M%sT
 Zone America/Whitehorse	-9:00:12 -	LMT	1900 Aug 20
-			-9:00	NT_YK	Y%sT	1966 Jul  1  2:00
+			-9:00	NT_YK	Y%sT	1967 May 28  0:00
 			-8:00	NT_YK	P%sT	1980
 			-8:00	Canada	P%sT
 Zone America/Dawson	-9:17:40 -	LMT	1900 Aug 20