proposed changes to tz data
Paul Eggert
eggert at twinsun.com
Thu Aug 18 18:11:25 UTC 1994
I went through all the messages to the tz list in the past weeks
plus a few notes I had made to myself, and came up with the following
proposed changes to the tz data. Aside from comments, the changes are:
* Adjust the Australia/Adelaide rule to reflect known behavior since 1990
reported by John Connolly, Robert Elz, and Bradley White.
* Adjust Asia/Novosibirsk to reflect that it switched time zones in
March, as reported by Stanislaw Kuzikowski. Add a new zone
Asia/Tomsk, since Tomsk did not switch and we need a Russian city that
is +0700.
* Change `Asia/Almaty' to `Asia/Alma-Ata'. This is in keeping with
the policy of using traditional English names. And even the
_Economist_, which brought up the name `Almaty' in the first place,
has gone back to calling that city `Alma-Ata'.
* Repair LMT typos for Atlantic/Faeroe, Europe/Vaduz,
Pacific/Enderbury, and Pacific/Wallis (thanks to Gwillim Law);
and for Europe/London (thanks to Peter Ilieve).
* Include two more historical events where the clock changed by 24
hours, one in Asia/Manila in 1844, the other in Pacific/Samoa in 1879.
I still don't know the details about America/Anchorage in 1867.
The most important changes to commentary are notes under GB-Eire and
M-Eur about the proposed 7th EU daylight savings time directive;
thanks to Peter Ilieve for this. A simple switch of commentary and
code can be done if the EU proposal is adopted.
diff -c ty/asia tz/asia
*** ty/asia Sat Jun 4 10:12:51 1994
--- tz/asia Thu Aug 18 09:36:57 1994
***************
*** 4,10 ****
# go ahead and edit the file (and please send any changes to
# tz at elsie.nci.nih.gov for general use in the future).
! # From Paul Eggert <eggert at twinsun.com> (November 18, 1993):
#
# A good source for time zone historical data outside the U.S. is
# Thomas G. Shanks, The International Atlas (3rd edition),
--- 4,10 ----
# go ahead and edit the file (and please send any changes to
# tz at elsie.nci.nih.gov for general use in the future).
! # From Paul Eggert <eggert at twinsun.com> (August 18, 1994):
#
# A good source for time zone historical data outside the U.S. is
# Thomas G. Shanks, The International Atlas (3rd edition),
***************
*** 15,20 ****
--- 15,24 ----
# Whitman Publishing Co, 2 Niagara Av, Ealing, London (undated), which
# I found in the UCLA library.
#
+ # A reliable and entertaining source about time zones is
+ # Derek Howse, Greenwich time and the discovery of the longitude,
+ # Oxford University Press (1980).
+ #
# I invented the abbreviations marked `*' in the following table;
# the rest are from earlier versions of this file, or from other sources.
# Corrections are welcome!
***************
*** 287,293 ****
5:30 - IST 1942 Sep
5:30 1:00 IST 1945 Oct 15
5:30 - IST
! # The following are like India/Calcutta:
# Andaman Is
# Lakshadweep (Laccadive, Minicoy and Amindivi Is)
# Nicobar Is
--- 291,297 ----
5:30 - IST 1942 Sep
5:30 1:00 IST 1945 Oct 15
5:30 - IST
! # The following are like Asia/Calcutta:
# Andaman Is
# Lakshadweep (Laccadive, Minicoy and Amindivi Is)
# Nicobar Is
***************
*** 509,519 ****
2:00 Jordan EET%s
# Kazakhstan
- # From Paul Eggert <eggert at twinsun.com> (November 18, 1993):
- # Before 1993, Almaty was known by its Russian name ``Alma-Ata''.
# From Shanks (1991):
# Zone NAME GMTOFF RULES FORMAT [UNTIL]
! Zone Asia/Almaty 5:07:48 - LMT 1924 May 2
5:00 - TSK 1957 Mar
6:00 Russia TS%s
--- 513,521 ----
2:00 Jordan EET%s
# Kazakhstan
# From Shanks (1991):
# Zone NAME GMTOFF RULES FORMAT [UNTIL]
! Zone Asia/Alma-Ata 5:07:48 - LMT 1924 May 2
5:00 - TSK 1957 Mar
6:00 Russia TS%s
***************
*** 673,678 ****
--- 675,682 ----
# This will undoubtedly change soon.
# Philippines
+ # Howse writes (p 162) that until 1844 the Philippines kept American date.
+ # The rest of this data is from Shanks.
# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
Rule Phil 1899 only - May 11 0:00 0 S
Rule Phil 1936 only - Nov 1 0:00 1:00 D
***************
*** 682,688 ****
Rule Phil 1978 only - Mar 22 0:00 1:00 D
Rule Phil 1978 only - Sep 21 0:00 0 S
# Zone NAME GMTOFF RULES FORMAT [UNTIL]
! Zone Asia/Manila 8:04:00 - LMT 1899 May 11
8:00 Phil P%sT 1942 May
9:00 - JST 1944 Nov
8:00 Phil P%sT
--- 686,693 ----
Rule Phil 1978 only - Mar 22 0:00 1:00 D
Rule Phil 1978 only - Sep 21 0:00 0 S
# Zone NAME GMTOFF RULES FORMAT [UNTIL]
! Zone Asia/Manila -15:56:00 - LMT 1844
! 8:04:00 - LMT 1899 May 11
8:00 Phil P%sT 1942 May
9:00 - JST 1944 Nov
8:00 Phil P%sT
diff -c ty/australasia tz/australasia
*** ty/australasia Mon Feb 7 06:57:49 1994
--- tz/australasia Thu Aug 18 09:07:12 1994
***************
*** 52,58 ****
Rule AS 1972 only - Feb 27 3:00 0 -
Rule AS 1973 1985 - Mar Sun>=1 3:00 0 -
Rule AS 1986 1989 - Mar Sun>=15 3:00 0 -
! Rule AS 1990 max even Mar Sun>=22 3:00 0 -
Rule AS 1990 max odd Mar Sun>=1 3:00 0 -
# Zone NAME GMTOFF RULES FORMAT [UNTIL]
Zone Australia/Adelaide 9:14:20 - LMT 1895 Feb
--- 52,58 ----
Rule AS 1972 only - Feb 27 3:00 0 -
Rule AS 1973 1985 - Mar Sun>=1 3:00 0 -
Rule AS 1986 1989 - Mar Sun>=15 3:00 0 -
! Rule AS 1990 max even Mar Sun>=18 3:00 0 -
Rule AS 1990 max odd Mar Sun>=1 3:00 0 -
# Zone NAME GMTOFF RULES FORMAT [UNTIL]
Zone Australia/Adelaide 9:14:20 - LMT 1895 Feb
***************
*** 181,187 ****
# Zone NAME GMTOFF RULES FORMAT [UNTIL]
Zone Pacific/Tarawa 11:32:04 - LMT 1901 # Bairiki
12:00 - NZST
! Zone Pacific/Enderbury -12:35:40 - LMT 1901
-12:00 - KJT 1979 Oct
-11:00 - SST
Zone Pacific/Kiritimati -10:29:20 - LMT 1901
--- 181,187 ----
# Zone NAME GMTOFF RULES FORMAT [UNTIL]
Zone Pacific/Tarawa 11:32:04 - LMT 1901 # Bairiki
12:00 - NZST
! Zone Pacific/Enderbury -11:24:20 - LMT 1901
-12:00 - KJT 1979 Oct
-11:00 - SST
Zone Pacific/Kiritimati -10:29:20 - LMT 1901
***************
*** 330,336 ****
# Wallis and Futuna
# Zone NAME GMTOFF RULES FORMAT [UNTIL]
! Zone Pacific/Wallis 11:44:40 - LMT 1901
12:00 - NZST
# Western Samoa
--- 330,336 ----
# Wallis and Futuna
# Zone NAME GMTOFF RULES FORMAT [UNTIL]
! Zone Pacific/Wallis 12:15:20 - LMT 1901
12:00 - NZST
# Western Samoa
***************
*** 344,354 ****
# go ahead and edit the file (and please send any changes to
# tz at elsie.nci.nih.gov for general use in the future).
! # From Paul Eggert <eggert at twinsun.com> (November 18, 1993):
# A good source for time zone historical data outside the U.S. is
# Thomas G. Shanks, The International Atlas (3rd edition),
# San Diego: ACS Publications, Inc. (1991).
! # Except where noted below, it is the source for the data above.
#
# I invented the abbreviations marked `*' in the following table;
# the rest are from earlier versions of this file, or from other sources.
--- 344,362 ----
# go ahead and edit the file (and please send any changes to
# tz at elsie.nci.nih.gov for general use in the future).
! # From Paul Eggert <eggert at twinsun.com> (August 18, 1994):
# A good source for time zone historical data outside the U.S. is
# Thomas G. Shanks, The International Atlas (3rd edition),
# San Diego: ACS Publications, Inc. (1991).
! # Except where noted, it is the source for the data above.
! #
! # Another source occasionally used is Edward W. Whitman, World Time Differences,
! # Whitman Publishing Co, 2 Niagara Av, Ealing, London (undated), which
! # I found in the UCLA library.
! #
! # A reliable and entertaining source about time zones is
! # Derek Howse, Greenwich time and the discovery of the longitude,
! # Oxford University Press (1980).
#
# I invented the abbreviations marked `*' in the following table;
# the rest are from earlier versions of this file, or from other sources.
***************
*** 547,552 ****
--- 555,570 ----
# numbered year (from 1990). That's when the Adelaide Festival
# is on...
+ # From Robert Elz (March 16, 1992, 00:57:07 +1000):
+ # DST didn't end in Adelaide today (yesterday)....
+ # But whether it's "4th Sunday" or "2nd last Sunday" I have no idea whatever...
+ # (it's just as likely to be "the Sunday we pick for this year"...).
+
+ # From Bradley White (April 11, 1994):
+ # If Sun, 15 March, 1992 was at +1030 as kre asserts, but yet Sun, 20 March,
+ # 1994 was at +0930 as John Connolly's customer seems to assert, then I can
+ # only conclude that the actual rule is more complicated....
+
# Australia/Tasmania
# From Bradley White (March 4, 1991):
***************
*** 706,711 ****
--- 724,735 ----
###############################################################################
+ # Fiji
+
+ # Howse writes (p 162) that in 1879 the British governor of Fiji
+ # enacted an ordinance standardizing the islands on +12:00.
+ # Perhaps it didn't take. We go with Shanks's more precise date in 1915.
+
# Kwajalein
# In comp.risks 14.87 (26 August 1993), Peter Neumann writes:
***************
*** 713,715 ****
--- 737,746 ----
# August 20, 1993. Thursday night at midnight Kwajalein switched sides with
# respect to the International Date Line, to rejoin its fellow islands,
# going from 11:59 p.m. Thursday to 12:00 m. Saturday in a blink.
+
+ # Pacific Islands Trust Territories
+
+ # Howse writes (p 162) ``The Spaniards, on the other hand, reached the
+ # Philippines and the Ladrones from America,'' and implies that the Ladrones
+ # (now called the Marianas) kept American date for quite some time.
+ # Ignore this for now, as we have no hard data. See also Asia/Manila.
diff -c ty/europe tz/europe
*** ty/europe Sat Jun 4 10:12:52 1994
--- tz/europe Thu Aug 18 10:17:10 1994
***************
*** 35,41 ****
# 4:00 KSK KSD Kuybyshev*
# 5:00 ESK ESD Yekaterinburg*
# 6:00 OSK OSD Omsk*
! # 7:00 NSK NSD Novosibirsk
# 8:00 ISK ISD Irkutsk*
# 9:00 YSK YSD Yakutsk*
# 10:00 VSK VSD Vladivostok*
--- 35,42 ----
# 4:00 KSK KSD Kuybyshev*
# 5:00 ESK ESD Yekaterinburg*
# 6:00 OSK OSD Omsk*
! # 6:00 NSK NSD Novosibirsk (was 7:00 until 1994)
! # 7:00 TSK TSD Tomsk*
# 8:00 ISK ISD Irkutsk*
# 9:00 YSK YSD Yakutsk*
# 10:00 VSK VSD Vladivostok*
***************
*** 56,61 ****
--- 57,83 ----
# United Kingdom
+ # From Peter Ilieve <peter at memex.co.uk> (July 6, 1994):
+ #
+ # On 17 Jan 1994 the Independent, a UK quality newspaper, had a piece about
+ # historical vistas along the Thames in west London. There was a photo
+ # and a sketch map showing some of the sightlines involved. One paragraph
+ # of the text said:
+ #
+ # `An old stone obelisk marking a forgotten terrestrial meridian stands
+ # beside the river at Kew. In the 18th century, before time and longditude
+ # was standardised by the Royal Observatory in Greenwich, scholars observed
+ # this stone and the movement of stars from Kew Observatory nearby. They
+ # made their calculations and set the time for the Horse Guards and Parliament,
+ # but now the stone is obscured by scrubwood and can only be seen by walking
+ # along the towpath within a few yards of it.'
+ #
+ # I have a one inch to one mile map of London and my estimate of the stone's
+ # position is 51 deg. 28' 30" N, 0 deg. 18' 45" W. The longditude should
+ # be within about +-2". The Ordnance Survey grid reference is TQ172761.
+ #
+ # [This yields GMTOFF = -0:01:15 for London LMT in the 18th century.]
+
# From Paul Eggert <eggert at twinsun.com> (November 18, 1993):
#
# Howse writes that Britain was the first country to use standard time.
***************
*** 548,553 ****
--- 570,597 ----
# 1993 28 Mar 24 Oct fixed
# 1994 27 Mar 23 Oct fixed
+ # From Peter Ilieve <peter at memex.co.uk> (June 8, 1994):
+ # The European Union bureaucracy has edged a step closer to a 7th Directive
+ # on summer-time arrangements. I have the text of a Common Position
+ # (EC No 9/94) and a statement of the Council's reasons dated 4 March 94,
+ # reported in the Official Journal of the EC, No. C 137/38--41....
+ # The dates again:
+ # Year Start End End (UK & Eire, 1995 only)
+ # (rule) (last Sun) (last Sun) (4th Sun)
+ # 1995 26 March 24 September 22 October
+ # 1996 31 March 27 October
+ # 1997 30 March 26 October
+
+ # From Peter Ilieve <peter at memex.co.uk> (March 28, 1994):
+ # The UK/Eire end date of 22 October [1995] conflicts with your current rule of
+ # Oct Sun>=23, and the historical UK formula of Sun after 4th Sat.
+ # The last time 4th Sun and Sun after 4th Sat differed was in 1989,
+ # when 29 October was used. That year was covered by a UK Summer Time Order
+ # for only a single year and it looks as though there was a matching 4th EC
+ # directive for just this year. I don't have the text of the 5th EC
+ # directive (for 1990--92) but my guess would be it said 4th Sun.
+ # To maintain strict historical accuracy you could start a new UK ending rule
+ # of Oct Sun>=22 in 1990.
# From Paul Eggert <eggert at twinsun.com> (November 18, 1993):
#
***************
*** 652,660 ****
# Current rules
Rule GB-Eire 1981 max - Mar lastSun 1:00s 1:00 BST
Rule GB-Eire 1981 max - Oct Sun>=23 1:00s 0 GMT
# Zone NAME GMTOFF RULES FORMAT [UNTIL]
! Zone Europe/London -0:00:37 - LMT 1847 Sep 22
0:00 GB-Eire %s 1968 Feb 18 2:00
1:00 - BST 1971 Oct 31 2:00
0:00 GB-Eire %s
--- 696,708 ----
# Current rules
Rule GB-Eire 1981 max - Mar lastSun 1:00s 1:00 BST
Rule GB-Eire 1981 max - Oct Sun>=23 1:00s 0 GMT
+ # Under the 7th EU proposal, replace the above line with the following three:
+ #Rule GB-Eire 1981 1989 - Oct Sun>=23 1:00s 0 GMT
+ #Rule GB-Eire 1990 1995 - Oct Sun>=22 1:00s 0 GMT
+ #Rule GB-Eire 1996 max - Oct lastSun 1:00s 0 GMT
# Zone NAME GMTOFF RULES FORMAT [UNTIL]
! Zone Europe/London -0:01:15 - LMT 1847 Sep 22
0:00 GB-Eire %s 1968 Feb 18 2:00
1:00 - BST 1971 Oct 31 2:00
0:00 GB-Eire %s
***************
*** 708,713 ****
--- 756,764 ----
Rule M-Eur 1977 only - Sep lastSun 2:00s 0 -
Rule M-Eur 1978 only - Oct 1 2:00s 0 -
Rule M-Eur 1979 max - Sep lastSun 2:00s 0 -
+ # Under the 7th EU proposal, replace the above line with the following two:
+ #Rule M-Eur 1979 1995 - Sep lastSun 2:00s 0 -
+ #Rule M-Eur 1996 max - Oct lastSun 2:00s 0 -
Rule M-Eur 1981 max - Mar lastSun 2:00s 1:00 " DST"
Rule E-Eur 1981 max - Mar lastSun 3:00s 1:00 " DST"
***************
*** 945,951 ****
1:00 M-Eur MET%s 1945 Apr 2 2:00
1:00 Denmark MET%s 1980 Apr 6 2:00
1:00 M-Eur MET%s
! Zone Atlantic/Faeroe 0:27:04 - LMT 1908 Jan 11 # Torshavn
0:00 - WET 1981 Mar 29 1:00
0:00 W-Eur WET%s
Zone America/Scoresbysund -1:29:00 - LMT 1916 Jul 28
--- 996,1002 ----
1:00 M-Eur MET%s 1945 Apr 2 2:00
1:00 Denmark MET%s 1980 Apr 6 2:00
1:00 M-Eur MET%s
! Zone Atlantic/Faeroe -0:27:04 - LMT 1908 Jan 11 # Torshavn
0:00 - WET 1981 Mar 29 1:00
0:00 W-Eur WET%s
Zone America/Scoresbysund -1:29:00 - LMT 1916 Jul 28
***************
*** 1269,1275 ****
# Liechtenstein
# Zone NAME GMTOFF RULES FORMAT [UNTIL]
! Zone Europe/Vaduz 0:30:04 - LMT 1894 Jun
1:00 - MET 1981 Mar 29 2:00
1:00 M-Eur MET%s
--- 1320,1326 ----
# Liechtenstein
# Zone NAME GMTOFF RULES FORMAT [UNTIL]
! Zone Europe/Vaduz 0:38:04 - LMT 1894 Jun
1:00 - MET 1981 Mar 29 2:00
1:00 M-Eur MET%s
***************
*** 1618,1629 ****
5:00 1:00 OSD 1991 Sep 29 2:00s
5:00 - OSK 1992 Jan 19 2:00s
6:00 Russia OS%s
Zone Asia/Novosibirsk 5:31:40 - LMT 1924 May 2
6:00 - NSK 1957 Mar
7:00 Russia NS%s 1991 Mar 31 2:00s
6:00 1:00 NSD 1991 Sep 29 2:00s
6:00 - NSK 1992 Jan 19 2:00s
! 7:00 Russia NS%s
Zone Asia/Irkutsk 6:57:20 - LMT 1880
6:57 - LST 1924 May 2
7:00 - ISK 1957 Mar
--- 1669,1694 ----
5:00 1:00 OSD 1991 Sep 29 2:00s
5:00 - OSK 1992 Jan 19 2:00s
6:00 Russia OS%s
+ # From Stanislaw A. Kuzikowski <S.A.Kuz at iae.nsk.su> (June 29, 1994):
+ # But now it is some months since Novosibirsk is 3 hours ahead of Moscow!
+ # I do not know why they have decided to make this change;
+ # as far as I remember it was done exactly during winter->summer switching
+ # so we (Novosibirsk) simply did not switch.
+ # Tomsk is still 4 hours ahead of Moscow.
Zone Asia/Novosibirsk 5:31:40 - LMT 1924 May 2
6:00 - NSK 1957 Mar
7:00 Russia NS%s 1991 Mar 31 2:00s
6:00 1:00 NSD 1991 Sep 29 2:00s
6:00 - NSK 1992 Jan 19 2:00s
! 7:00 Russia NS%s 1994 Mar 27 2:00s
! 6:00 1:00 NSD 1994 Sep 25 2:00s
! 6:00 Russia NS%s
! Zone Asia/Tomsk 5:39:52 - LMT 1924 May 2
! 6:00 - TSK 1957 Mar
! 7:00 Russia TS%s 1991 Mar 31 2:00s
! 6:00 1:00 TSD 1991 Sep 29 2:00s
! 6:00 - TSK 1992 Jan 19 2:00s
! 7:00 Russia TS%s
Zone Asia/Irkutsk 6:57:20 - LMT 1880
6:57 - LST 1924 May 2
7:00 - ISK 1957 Mar
***************
*** 1725,1731 ****
Rule Spain 1977 1978 - Apr 2 23:00 1:00 " DST"
Rule Spain 1978 only - Oct 1 1:00 0 -
# Zone NAME GMTOFF RULES FORMAT [UNTIL]
! Zone Europe/Madrid 0:14:44 - LMT 1901
0:00 Spain WET%s 1946 Sep 30
1:00 Spain MET%s 1979 Apr 1 2:00
1:00 M-Eur MET%s
--- 1790,1796 ----
Rule Spain 1977 1978 - Apr 2 23:00 1:00 " DST"
Rule Spain 1978 only - Oct 1 1:00 0 -
# Zone NAME GMTOFF RULES FORMAT [UNTIL]
! Zone Europe/Madrid -0:14:44 - LMT 1901
0:00 Spain WET%s 1946 Sep 30
1:00 Spain MET%s 1979 Apr 1 2:00
1:00 M-Eur MET%s
diff -c ty/northamerica tz/northamerica
*** ty/northamerica Sat Jun 4 10:12:51 1994
--- tz/northamerica Wed Aug 17 23:23:49 1994
***************
*** 5,10 ****
--- 5,15 ----
# go ahead and edit the file (and please send any changes to
# tz at elsie.nci.nih.gov for general use in the future).
+ # From Paul Eggert <eggert at twinsun.com> (August 17, 1994):
+ # A reliable and entertaining source about time zones is
+ # Derek Howse, Greenwich time and the discovery of the longitude,
+ # Oxford University Press (1980).
+
###############################################################################
# United States
***************
*** 106,111 ****
--- 111,121 ----
# Samoa standard time
# The law doesn't give abbreviations.
+ # From Paul Eggert <eggert at twinsun.com> (August 16, 1994):
+ # Howse writes that Alaska switched from the Julian to the Gregorian calendar,
+ # and from east-of-GMT to west-of-GMT days, in 1867 when the US purchased it
+ # from Russia. We don't have this data pinned down yet, though.
+
# Easy stuff first--including Alaska, where we ignore history (since we
# can't tell if we should give Yukon time or Alaska-Hawaii time for "old"
# times).
***************
*** 148,155 ****
-5:00 US E%sT
# Samoa just changes names. No DST, per Naval Observatory.
! Zone Pacific/Samoa -11:22:48 - LMT 1911
-11:30 - SST 1950
-11:00 - NST 1967 Apr # N=Nome
-11:00 - BST 1983 Nov 30 # B=Bering
--- 158,171 ----
-5:00 US E%sT
# Samoa just changes names. No DST, per Naval Observatory.
+ #
+ # Howse writes that in 1879 the King of Samoa decided to change
+ # ``the date in his kingdom from the Antipodean to the American system,
+ # ordaining -- by a masterpiece of diplomatic flattery -- that
+ # the Fourth of July should be celebrated twice in that year.''
! Zone Pacific/Samoa 12:37:12 - LMT 1879 Jul 5
! -11:22:48 - LMT 1911
-11:30 - SST 1950
-11:00 - NST 1967 Apr # N=Nome
-11:00 - BST 1983 Nov 30 # B=Bering
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