[tz] [PATCH 6/7] Incorporate data from Milne (1899).

Paul Eggert eggert at cs.ucla.edu
Thu Feb 21 07:56:23 UTC 2013


The source is: Milne J. Civil time. Geogr J. 1899 Feb;13(2):173-94
<http://www.jstor.org/stable/1774359>.
* africa (Africa/Gaborone, Africa/Cairo):
* asia (Asia/Rangoon, Asia/Shanghai, Asia/Hong_Kong, Asia/Aden):
* australasia (Pacific/Fiji):
* europe (Europe/Vienna):
* northamerica (America/Nassau, America/Barbados, Atlantic/Bermuda)
(America/Costa_Rica):
* southamerica (America/Bogota, America/Curacao):
Adjust old time stamps to match Milne.  I went going through
Milne's list one by one and did not finish, but the rest can be
done later.
---
 africa       |   17 +++++++++++++++--
 asia         |   48 +++++++++++++++++++++++++++++++++++++++++-------
 australasia  |   11 +++++++++--
 europe       |   10 +++++++++-
 northamerica |   31 +++++++++++++++++++++++++------
 southamerica |   21 ++++++++++++++++++---
 6 files changed, 117 insertions(+), 21 deletions(-)

diff --git a/africa b/africa
index 54c7a1e..f378cc4 100644
--- a/africa
+++ b/africa
@@ -6,7 +6,7 @@
 # go ahead and edit the file (and please send any changes to
 # tz at iana.org for general use in the future).
 
-# From Paul Eggert (2006-03-22):
+# From Paul Eggert (2013-02-21):
 #
 # A good source for time zone historical data outside the U.S. is
 # Thomas G. Shanks and Rique Pottenger, The International Atlas (6th edition),
@@ -25,6 +25,10 @@
 # Whitman Publishing Co, 2 Niagara Av, Ealing, London (undated), which
 # I found in the UCLA library.
 #
+# For data circa 1899, a common source is:
+# Milne J. Civil time. Geogr J. 1899 Feb;13(2):173-94
+# <http://www.jstor.org/stable/1774359>.
+#
 # A reliable and entertaining source about time zones is
 # Derek Howse, Greenwich time and longitude, Philip Wilson Publishers (1997).
 #
@@ -116,8 +120,12 @@ Zone Africa/Porto-Novo	0:10:28	-	LMT	1912
 			1:00	-	WAT
 
 # Botswana
+# From Paul Eggert (2013-02-21):
+# Milne says they were regulated by the Cape Town Signal in 1899;
+# assume they switched to 2:00 when Cape Town did.
 # Zone	NAME		GMTOFF	RULES	FORMAT	[UNTIL]
 Zone	Africa/Gaborone	1:43:40 -	LMT	1885
+			1:30	-	SAST	1903 Mar
 			2:00	-	CAT	1943 Sep 19 2:00
 			2:00	1:00	CAST	1944 Mar 19 2:00
 			2:00	-	CAT
@@ -189,6 +197,11 @@ Zone	Africa/Djibouti	2:52:36 -	LMT	1911 Jul
 
 # Egypt
 
+# Milne says Cairo used 2:05:08.9, the local mean time of the Abbasizeh
+# observatory; round to nearest.  Milne also says that the official time for
+# Egypt was mean noon at the Great Pyramid, 2:04:30.5, but apparently this
+# did not apply to Cairo, Alexandria, or Port Said.
+
 # Rule	NAME	FROM	TO	TYPE	IN	ON	AT	SAVE	LETTER/S
 Rule	Egypt	1940	only	-	Jul	15	0:00	1:00	S
 Rule	Egypt	1940	only	-	Oct	 1	0:00	0	-
@@ -329,7 +342,7 @@ Rule	Egypt	2010	only	-	Sep	10	0:00	1:00	S
 Rule	Egypt	2010	only	-	Sep	lastThu	23:00s	0	-
 
 # Zone	NAME		GMTOFF	RULES	FORMAT	[UNTIL]
-Zone	Africa/Cairo	2:05:00 -	LMT	1900 Oct
+Zone	Africa/Cairo	2:05:09 -	LMT	1900 Oct
 			2:00	Egypt	EE%sT
 
 # Equatorial Guinea
diff --git a/asia b/asia
index d5562c8..1f09fa3 100644
--- a/asia
+++ b/asia
@@ -6,7 +6,7 @@
 # go ahead and edit the file (and please send any changes to
 # tz at iana.org for general use in the future).
 
-# From Paul Eggert (2006-03-22):
+# From Paul Eggert (2013-02-21):
 #
 # A good source for time zone historical data outside the U.S. is
 # Thomas G. Shanks and Rique Pottenger, The International Atlas (6th edition),
@@ -25,6 +25,10 @@
 # Whitman Publishing Co, 2 Niagara Av, Ealing, London (undated), which
 # I found in the UCLA library.
 #
+# For data circa 1899, a common source is:
+# Milne J. Civil time. Geogr J. 1899 Feb;13(2):173-94
+# <http://www.jstor.org/stable/1774359>.
+#
 # A reliable and entertaining source about time zones is
 # Derek Howse, Greenwich time and longitude, Philip Wilson Publishers (1997).
 #
@@ -279,9 +283,12 @@ Zone	Asia/Brunei	7:39:40 -	LMT	1926 Mar   # Bandar Seri Begawan
 			8:00	-	BNT
 
 # Burma / Myanmar
+
+# Milne says 6:24:40 was the meridian of the time ball observatory at Rangoon.
+
 # Zone	NAME		GMTOFF	RULES	FORMAT	[UNTIL]
 Zone	Asia/Rangoon	6:24:40 -	LMT	1880		# or Yangon
-			6:24:36	-	RMT	1920	   # Rangoon Mean Time?
+			6:24:40	-	RMT	1920	   # Rangoon Mean Time?
 			6:30	-	BURT	1942 May   # Burma Time
 			9:00	-	JST	1945 May 3
 			6:30	-	MMT		   # Myanmar Time
@@ -384,7 +391,8 @@ Zone	Asia/Harbin	8:26:44	-	LMT	1928 # or Haerbin
 			8:00	PRC	C%sT
 # Zhongyuan Time ("Central plain Time")
 # most of China
-Zone	Asia/Shanghai	8:05:52	-	LMT	1928
+# Milne gives 8:05:56.7; round to nearest.
+Zone	Asia/Shanghai	8:05:57	-	LMT	1928
 			8:00	Shang	C%sT	1949
 			8:00	PRC	C%sT
 # Long-shu Time (probably due to Long and Shu being two names of that area)
@@ -481,6 +489,10 @@ Zone	Asia/Kashgar	5:03:56	-	LMT	1928 # or Kashi or Kaxgar
 			8:00	PRC	C%sT
 
 
+# Hong Kong (Xianggang)
+
+# Milne gives 7:36:41.7; round this.
+
 # From Lee Yiu Chung (2009-10-24):
 # I found there are some mistakes for the...DST rule for Hong
 # Kong. [According] to the DST record from Hong Kong Observatory (actually,
@@ -547,7 +559,6 @@ Zone	Asia/Kashgar	5:03:56	-	LMT	1928 # or Kashi or Kaxgar
 # The Japanese surrender of Hong Kong was signed 1945-09-15.
 # For lack of anything better, use start of those days as the transition times.
 
-# Hong Kong (Xianggang)
 # Rule	NAME	FROM	TO	TYPE	IN	ON	AT	SAVE	LETTER/S
 Rule	HK	1941	only	-	Apr	1	3:30	1:00	S
 Rule	HK	1941	only	-	Sep	30	3:30	0	-
@@ -569,7 +580,7 @@ Rule	HK	1973	only	-	Dec	30	3:30	1:00	S
 Rule	HK	1979	only	-	May	Sun>=8	3:30	1:00	S
 Rule	HK	1979	only	-	Oct	Sun>=16	3:30	0	-
 # Zone	NAME		GMTOFF	RULES	FORMAT	[UNTIL]
-Zone	Asia/Hong_Kong	7:36:36 -	LMT	1904 Oct 30
+Zone	Asia/Hong_Kong	7:36:42 -	LMT	1904 Oct 30
 			8:00	HK	HK%sT	1941 Dec 25
 			9:00	-	JST	1945 Sep 15
 			8:00	HK	HK%sT
@@ -646,6 +657,9 @@ Zone	Asia/Macau	7:34:20 -	LMT	1912
 ###############################################################################
 
 # Cyprus
+#
+# Milne says the Eastern Telegraph Company used 2:14:00.  Stick with LMT.
+#
 # Rule	NAME	FROM	TO	TYPE	IN	ON	AT	SAVE	LETTER/S
 Rule	Cyprus	1975	only	-	Apr	13	0:00	1:00	S
 Rule	Cyprus	1975	only	-	Oct	12	0:00	0	-
@@ -1804,8 +1818,11 @@ Zone	Asia/Kathmandu	5:41:16 -	LMT	1920
 			5:45	-	NPT	# Nepal Time
 
 # Oman
+
+# Milne says 3:54:24 was the meridian of the Muscat Tidal Observatory.
+
 # Zone	NAME		GMTOFF	RULES	FORMAT	[UNTIL]
-Zone	Asia/Muscat	3:54:20 -	LMT	1920
+Zone	Asia/Muscat	3:54:24 -	LMT	1920
 			4:00	-	GST
 
 # Pakistan
@@ -2400,6 +2417,13 @@ Zone	Asia/Singapore	6:55:25 -	LMT	1901 Jan  1
 # no information
 
 # Sri Lanka
+
+# From Paul Eggert (2013-02-21):
+# Milne says "Madras mean time use from May 1, 1898.  Prior to this Colombo
+# mean time, 5h. 4m. 21.9s. F., was used."  But 5:04:21.9 differs considerably
+# from Colombo's meridian 5:19:24, so for now ignore Milne and stick with
+# Shanks and Pottenger.
+
 # From Paul Eggert (1996-09-03):
 # "Sri Lanka advances clock by an hour to avoid blackout"
 # (www.virtual-pc.com/lankaweb/news/items/240596-2.html, 1996-05-24,
@@ -2699,6 +2723,12 @@ Zone	Asia/Tashkent	4:37:12 -	LMT	1924 May  2
 
 # Vietnam
 
+# From Paul Eggert (2013-02-21):
+# Milne gives 7:16:56 for the meridian of Saigon in 1899, as being
+# used in Lower Laos, Cambodia, and Annam.  But this is quite a ways
+# from Saigon's location.  For now, ignore this and stick with Shanks
+# and Pottenger.
+
 # From Arthur David Olson (2008-03-18):
 # The English-language name of Vietnam's most populous city is "Ho Chi Min City";
 # we use Ho_Chi_Minh below to avoid a name of more than 14 characters.
@@ -2712,6 +2742,10 @@ Zone	Asia/Ho_Chi_Minh	7:06:40 -	LMT	1906 Jun  9
 			7:00	-	ICT
 
 # Yemen
+
+# Milne says 2:59:54 was the meridian of the saluting battery at Aden,
+# and that Yemen was at 1:55:56, the meridian of the Hagia Sophia.
+
 # Zone	NAME		GMTOFF	RULES	FORMAT	[UNTIL]
-Zone	Asia/Aden	3:00:48	-	LMT	1950
+Zone	Asia/Aden	2:59:54	-	LMT	1950
 			3:00	-	AST
diff --git a/australasia b/australasia
index bef6f20..58df73d 100644
--- a/australasia
+++ b/australasia
@@ -246,6 +246,9 @@ Zone	Indian/Cocos	6:27:40	-	LMT	1900
 			6:30	-	CCT	# Cocos Islands Time
 
 # Fiji
+
+# Milne gives 11:55:44 for Suva.
+
 # From Alexander Krivenyshev (2009-11-10):
 # According to Fiji Broadcasting Corporation,  Fiji plans to re-introduce DST
 # from November 29th 2009  to April 25th 2010.
@@ -339,7 +342,7 @@ Rule	Fiji	2010	max	-	Oct	Sun>=18	2:00	1:00	S
 Rule	Fiji	2011	only	-	Mar	Sun>=1	3:00	0	-
 Rule	Fiji	2012	max	-	Jan	Sun>=18	3:00	0	-
 # Zone	NAME		GMTOFF	RULES	FORMAT	[UNTIL]
-Zone	Pacific/Fiji	11:53:40 -	LMT	1915 Oct 26	# Suva
+Zone	Pacific/Fiji	11:55:44 -	LMT	1915 Oct 26	# Suva
 			12:00	Fiji	FJ%sT	# Fiji Time
 
 # French Polynesia
@@ -782,7 +785,7 @@ Zone	Pacific/Wallis	12:15:20 -	LMT	1901
 # go ahead and edit the file (and please send any changes to
 # tz at iana.org for general use in the future).
 
-# From Paul Eggert (2006-03-22):
+# From Paul Eggert (2013-02-21):
 # A good source for time zone historical data outside the U.S. is
 # Thomas G. Shanks and Rique Pottenger, The International Atlas (6th edition),
 # San Diego: ACS Publications, Inc. (2003).
@@ -800,6 +803,10 @@ Zone	Pacific/Wallis	12:15:20 -	LMT	1901
 # Whitman Publishing Co, 2 Niagara Av, Ealing, London (undated), which
 # I found in the UCLA library.
 #
+# For data circa 1899, a common source is:
+# Milne J. Civil time. Geogr J. 1899 Feb;13(2):173-94
+# <http://www.jstor.org/stable/1774359>.
+#
 # A reliable and entertaining source about time zones is
 # Derek Howse, Greenwich time and longitude, Philip Wilson Publishers (1997).
 #
diff --git a/europe b/europe
index dbd9a71..5081a52 100644
--- a/europe
+++ b/europe
@@ -30,6 +30,12 @@
 #	William Willett, The Waste of Daylight, 19th edition
 #	</a> (1914-03)
 #
+#	Milne J. Civil time. Geogr J. 1899 Feb;13(2):173-94
+#	<http://www.jstor.org/stable/1774359>.  He writes:
+#	"It is requested that corrections and additions to these tables
+#	may be sent to Mr. John Milne, Royal Geographical Society,
+#	Savile Row, London."  Nowadays please email them to tz at iana.org.
+#
 #	Brazil's Departamento Servico da Hora (DSH),
 #	<a href="http://pcdsh01.on.br/HISTHV.htm">
 #	History of Summer Time
@@ -666,6 +672,8 @@ Zone	Europe/Andorra	0:06:04 -	LMT	1901
 
 # Austria
 
+# Milne says Vienna time was 1:05:21.
+
 # From Paul Eggert (2006-03-22): Shanks & Pottenger give 1918-06-16 and
 # 1945-11-18, but the Austrian Federal Office of Metrology and
 # Surveying (BEV) gives 1918-09-16 and for Vienna gives the "alleged"
@@ -683,7 +691,7 @@ Rule	Austria	1948	only	-	Apr	18	2:00s	1:00	S
 Rule	Austria	1980	only	-	Apr	 6	0:00	1:00	S
 Rule	Austria	1980	only	-	Sep	28	0:00	0	-
 # Zone	NAME		GMTOFF	RULES	FORMAT	[UNTIL]
-Zone	Europe/Vienna	1:05:20 -	LMT	1893 Apr
+Zone	Europe/Vienna	1:05:21 -	LMT	1893 Apr
 			1:00	C-Eur	CE%sT	1920
 			1:00	Austria	CE%sT	1940 Apr  1 2:00s
 			1:00	C-Eur	CE%sT	1945 Apr  2 2:00s
diff --git a/northamerica b/northamerica
index 772d7a4..9de6f5d 100644
--- a/northamerica
+++ b/northamerica
@@ -1019,6 +1019,9 @@ Zone America/Menominee	-5:50:27 -	LMT	1885 Sep 18 12:00
 #	William Willett, The Waste of Daylight, 19th edition
 #	</a> (1914-03)
 #
+#	Milne J. Civil time. Geogr J. 1899 Feb;13(2):173-94
+#	<http://www.jstor.org/stable/1774359>.
+#
 # See the `europe' file for Greenland.
 
 # Canada
@@ -2554,6 +2557,8 @@ Zone	America/Antigua	-4:07:12 -	LMT	1912 Mar 2
 
 # Bahamas
 #
+# For 1899 Milne gives -5:09:29.5; round that.
+#
 # From Sue Williams (2006-12-07):
 # The Bahamas announced about a month ago that they plan to change their DST
 # rules to sync with the U.S. starting in 2007....
@@ -2563,11 +2568,14 @@ Zone	America/Antigua	-4:07:12 -	LMT	1912 Mar 2
 Rule	Bahamas	1964	1975	-	Oct	lastSun	2:00	0	S
 Rule	Bahamas	1964	1975	-	Apr	lastSun	2:00	1:00	D
 # Zone	NAME		GMTOFF	RULES	FORMAT	[UNTIL]
-Zone	America/Nassau	-5:09:24 -	LMT	1912 Mar 2
+Zone	America/Nassau	-5:09:30 -	LMT	1912 Mar 2
 			-5:00	Bahamas	E%sT	1976
 			-5:00	US	E%sT
 
 # Barbados
+
+# For 1899 Milne gives -3:58:29.2; round that.
+
 # Rule	NAME	FROM	TO	TYPE	IN	ON	AT	SAVE	LETTER/S
 Rule	Barb	1977	only	-	Jun	12	2:00	1:00	D
 Rule	Barb	1977	1978	-	Oct	Sun>=1	2:00	0	S
@@ -2575,8 +2583,8 @@ Rule	Barb	1978	1980	-	Apr	Sun>=15	2:00	1:00	D
 Rule	Barb	1979	only	-	Sep	30	2:00	0	S
 Rule	Barb	1980	only	-	Sep	25	2:00	0	S
 # Zone	NAME		GMTOFF	RULES	FORMAT	[UNTIL]
-Zone America/Barbados	-3:58:28 -	LMT	1924		# Bridgetown
-			-3:58:28 -	BMT	1932	  # Bridgetown Mean Time
+Zone America/Barbados	-3:58:29 -	LMT	1924		# Bridgetown
+			-3:58:29 -	BMT	1932	  # Bridgetown Mean Time
 			-4:00	Barb	A%sT
 
 # Belize
@@ -2594,6 +2602,9 @@ Zone	America/Belize	-5:52:48 -	LMT	1912 Apr
 
 # Bermuda
 
+# For 1899 Milne gives -4:19:18.3 as the meridian of the clock tower,
+# Bermuda dockyard, Ireland I; round that.
+
 # From Dan Jones, reporting in The Royal Gazette (2006-06-26):
 
 # Next year, however, clocks in the US will go forward on the second Sunday
@@ -2603,7 +2614,7 @@ Zone	America/Belize	-5:52:48 -	LMT	1912 Apr
 # http://www.theroyalgazette.com/apps/pbcs.dll/article?AID=/20060529/NEWS/105290135
 
 # Zone	NAME		GMTOFF	RULES	FORMAT	[UNTIL]
-Zone Atlantic/Bermuda	-4:19:04 -	LMT	1930 Jan  1 2:00    # Hamilton
+Zone Atlantic/Bermuda	-4:19:18 -	LMT	1930 Jan  1 2:00    # Hamilton
 			-4:00	-	AST	1974 Apr 28 2:00
 			-4:00	Bahamas	A%sT	1976
 			-4:00	US	A%sT
@@ -2615,6 +2626,9 @@ Zone	America/Cayman	-5:25:32 -	LMT	1890		# Georgetown
 			-5:00	-	EST
 
 # Costa Rica
+
+# Milne gives -5:36:13.3 as San Jose mean time; round to nearest.
+
 # Rule	NAME	FROM	TO	TYPE	IN	ON	AT	SAVE	LETTER/S
 Rule	CR	1979	1980	-	Feb	lastSun	0:00	1:00	D
 Rule	CR	1979	1980	-	Jun	Sun>=1	0:00	0	S
@@ -2625,14 +2639,19 @@ Rule	CR	1991	only	-	Jul	 1	0:00	0	S
 Rule	CR	1992	only	-	Mar	15	0:00	0	S
 # There are too many San Joses elsewhere, so we'll use `Costa Rica'.
 # Zone	NAME		GMTOFF	RULES	FORMAT	[UNTIL]
-Zone America/Costa_Rica	-5:36:20 -	LMT	1890		# San Jose
-			-5:36:20 -	SJMT	1921 Jan 15 # San Jose Mean Time
+Zone America/Costa_Rica	-5:36:13 -	LMT	1890		# San Jose
+			-5:36:13 -	SJMT	1921 Jan 15 # San Jose Mean Time
 			-6:00	CR	C%sT
 # Coco
 # no information; probably like America/Costa_Rica
 
 # Cuba
 
+# From Paul Eggert (2013-02-21):
+# Milne gives -5:28:50.45 for the observatory at Havana, -5:29:23.57
+# for the port, and -5:30 for meteorological observations.
+# For now, stick with Shanks & Pottenger.
+
 # From Arthur David Olson (1999-03-29):
 # The 1999-03-28 exhibition baseball game held in Havana, Cuba, between
 # the Cuban National Team and the Baltimore Orioles was carried live on
diff --git a/southamerica b/southamerica
index e4c8720..671d09b 100644
--- a/southamerica
+++ b/southamerica
@@ -11,6 +11,10 @@
 # Thomas G. Shanks and Rique Pottenger, The International Atlas (6th edition),
 # San Diego: ACS Publications, Inc. (2003).
 #
+# For data circa 1899, a common source is:
+# Milne J. Civil time. Geogr J. 1899 Feb;13(2):173-94
+# <http://www.jstor.org/stable/1774359>.
+#
 # Gwillim Law writes that a good source
 # for recent time zone data is the International Air Transport
 # Association's Standard Schedules Information Manual (IATA SSIM),
@@ -447,6 +451,9 @@ Rule	Arg	2008	only	-	Oct	Sun>=15	0:00	1:00	S
 # rules...San Luis is still using "Western ARgentina Time" and it got
 # stuck on Summer daylight savings time even though the summer is over.
 
+# From Paul Eggert (2013-02-21):
+# Milne says Cordoba time was -4:16:48.2.  Round to the nearest second.
+
 # Zone	NAME		GMTOFF	RULES	FORMAT	[UNTIL]
 #
 # Buenos Aires (BA), Capital Federal (CF),
@@ -1303,17 +1310,23 @@ Zone Pacific/Easter	-7:17:44 -	LMT	1890
 # San Felix, and Antarctic bases, are like America/Santiago.
 
 # Colombia
+
+# Milne gives 4:56:16.4 for Bogota time in 1899; round to nearest.  He writes,
+# "A variation of fifteen minutes in the public clocks of Bogota is not rare."
+
 # Rule	NAME	FROM	TO	TYPE	IN	ON	AT	SAVE	LETTER/S
 Rule	CO	1992	only	-	May	 3	0:00	1:00	S
 Rule	CO	1993	only	-	Apr	 4	0:00	0	-
 # Zone	NAME		GMTOFF	RULES	FORMAT	[UNTIL]
-Zone	America/Bogota	-4:56:20 -	LMT	1884 Mar 13
-			-4:56:20 -	BMT	1914 Nov 23 # Bogota Mean Time
+Zone	America/Bogota	-4:56:16 -	LMT	1884 Mar 13
+			-4:56:16 -	BMT	1914 Nov 23 # Bogota Mean Time
 			-5:00	CO	CO%sT	# Colombia Time
 # Malpelo, Providencia, San Andres
 # no information; probably like America/Bogota
 
 # Curacao
+
+# Milne gives 4:35:46.9 for Curacao mean time; round to nearest.
 #
 # From Paul Eggert (2006-03-22):
 # Shanks & Pottenger say that The Bottom and Philipsburg have been at
@@ -1330,7 +1343,7 @@ Zone	America/Bogota	-4:56:20 -	LMT	1884 Mar 13
 # though, as far as we know.
 #
 # Zone	NAME		GMTOFF	RULES	FORMAT	[UNTIL]
-Zone	America/Curacao	-4:35:44 -	LMT	1912 Feb 12	# Willemstad
+Zone	America/Curacao	-4:35:47 -	LMT	1912 Feb 12	# Willemstad
 			-4:30	-	ANT	1965 # Netherlands Antilles Time
 			-4:00	-	AST
 
@@ -1344,6 +1357,8 @@ Link	America/Curacao	America/Kralendijk # Bonaire, Sint Estatius and Saba
 
 # Ecuador
 #
+# Milne says the Sentral and South American Telegraph Company used -5:24:15.
+#
 # From Paul Eggert (2007-03-04):
 # Apparently Ecuador had a failed experiment with DST in 1992.
 # <http://midena.gov.ec/content/view/1261/208/> (2007-02-27) and
-- 
1.7.10.4




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