proposed changes to tz data for Baltic republics, Mexico, Crimea, etc.
Paul Eggert
eggert at twinsun.com
Wed Sep 23 01:47:07 UTC 1998
Here are some proposed changes to the tz data that I've been saving up
for a while.
* Revamp the rules for Latvia since 1944, taken from a very nice summary
of legal citations sent in Thursday by Liene Kanepe.
* The following changes came from data derived from recent issues of
the IATA SSIM, kindly forwarded by Gwillim Law.
- Lithuania and Estonia observe EU DST rules starting this year.
- Two states in Mexico switched time zones last year, requiring the
addition of two entries: America/Cancun and America/Chihuahua.
- Crimea switched back to EET from Moscow time last year.
- Libya stopped observing DST this year, and last year used rules other than
what the older SSIM predicted.
- Egypt's DST transitions are the 4th Friday in April, not the last Friday;
transitions occur at midnight (not at 01:00 in spring and 03:00 in fall).
- Kirgizstan switched to EU-like rules (except switching at 02:30
local time) last year.
- Azerbaijan switched from the EU rules to slightly localized rules
(switching at 01:00 local time instead of 01:00 UTC) last year.
- New Caledonia stopped observing DST last year.
- Cuba's DST rules are now more like the US's (but not exactly like).
- Haiti stopped observing DST this year.
- Paraguay's DST dates have changed slightly.
- Update guesses about what happened in Armenia between 1992 and 1997.
* The following changes were derived from a newer version (1995) of Shanks's
atlas.
- What is now Uzbekistan had two time zones until 1981. Add an
entry Asia/Samarkand to reflect the other zone. (I always wanted
an excuse to add Samarkand....)
- Asia/Ashkhabad, Asia/Dushanbe, and Asia/Tashkent switched to standard
time in 1930, not 1957. There were several other changes for these
cities between 1930 and the present.
- Europe/Minsk had several changes for times before 1992.
- The Cook Islands stopped observing DST in 1991.
- Add greater precision to historical times for Asia/Colombo
(e.g. it was at 5:19:32 (not 5:20) between 1880 and 1906),
America/Cayman, America/Jamaica, America/St_Vincent, America/Grand_Turk.
* Update references in WWW.htm, and remove a stray </P> that nsgmls
said does not conform to the standard.
* Rename Asia/Alma-Ata to Asia/Almaty, as most references in English to
this city now use the Kazakh name instead of the older Russian name.
Here is the patch:
===================================================================
RCS file: RCS/WWW.htm,v
retrieving revision 1998.5
retrieving revision 1998.5.1.1
diff -p -u -r1998.5 -r1998.5.1.1
--- WWW.htm 1998/05/28 13:56:25 1998.5
+++ WWW.htm 1998/09/23 00:18:21 1998.5.1.1
@@ -9,7 +9,6 @@
<H6>
@(#)WWW.htm 7.15
</H6>
-</P>
<H2>Paul Eggert writes:</H2><P>
The public-domain tz database contains code and data
that represent the history of local time
@@ -63,17 +62,18 @@ Time of Internet</A>
contains good descriptions of Time Zones and daylight saving time,
with diagrams.
The time zone map is out of date, however.
-<LI><A HREF="http://community.bellcore.com/mbr/gmt-explained.html">A Few Facts
-Concerning GMT, UT, and the RGO</A>
+<LI><A HREF="http://ecco.bsee.swin.edu.au/chronos/GMT-explained.html">A
+Few Facts Concerning GMT, UT, and the RGO</A>
answers questions like ``What is the difference between GMT and UTC?''
<LI><A HREF="http://www.energy.ca.gov/daylightsaving.html">Daylight
Saving Time -- Saving Time, Saving Energy</A>
is a history of DST in the US.
-<LI><A HREF="http://www.yahoo.com/Science/Weights_and_Measures/Measurements/Time/Daylight_Saving_Time/">Yahoo! - Science:Weights and Measures:Measurements:Time:Daylight Saving Time</A>
+<LI><A HREF="http://dir.yahoo.com/Science/Measurements_and_Units/Time/Time_Zones/">Yahoo! - Science:Measurements and Units:Time:Time Zones</A>
is where the famous Internet indexing service Yahoo! collects its time zone
info.
<LI>The <A HREF="http://www.iata.org/">International Air Transport Association</A>
-publishes the IATA SSIM, which gives current time zone rules for
+publishes the IATA Standard Schedules Information Manual (SSIM),
+which gives current time zone rules for
all the airports served by commercial aviation.
<LI><A HREF="http://hpiers.obspm.fr/webiers/results/bul/README.html">Bulletins
of IERS</A> contains official publications of the
@@ -82,11 +82,11 @@ when leap seconds occur.
</UL>
<P>
-- <A HREF="mailto:eggert at twinsun.com">eggert at twinsun.com</A>
-(1997-12-26)
+(1998-09-22)
</P>
<H2>Arthur David Olson writes:</H2><P>
A good source of information about ISO 8601 seems to be
-<A HREF="http://www.ft.uni-erlangen.de/~mskuhn/iso-time.html">International
+<A HREF="http://www.cl.cam.ac.uk/~mgk25/iso-time.html">International
Standard Date and Time Notation</A>
maintained by Markus Kuhn.
<P>
===================================================================
RCS file: RCS/africa,v
retrieving revision 1998.5
retrieving revision 1998.5.1.1
diff -p -u -r1998.5 -r1998.5.1.1
--- africa 1998/05/28 13:56:12 1998.5
+++ africa 1998/09/23 00:18:21 1998.5.1.1
@@ -206,9 +206,10 @@ Rule Egypt 1983 only - Jul 12 1:00 1:00
Rule Egypt 1984 1988 - May 1 1:00 1:00 S
Rule Egypt 1989 only - May 6 1:00 1:00 S
Rule Egypt 1990 1994 - May 1 1:00 1:00 S
-# IATA (after 1990) says transitions are at 0:00; go with Shanks.
-Rule Egypt 1995 max - Apr lastFri 1:00 1:00 S
-Rule Egypt 1995 max - Sep lastFri 3:00 0 -
+# IATA (after 1990) says transitions are at 0:00.
+# Go with IATA starting in 1995.
+Rule Egypt 1995 max - Apr Fri>=22 0:00s 1:00 S
+Rule Egypt 1995 max - Sep lastFri 23:00s 0 -
# Zone NAME GMTOFF RULES FORMAT [UNTIL]
Zone Africa/Cairo 2:05:00 - LMT 1900 Oct
@@ -323,15 +324,16 @@ Rule Libya 1987 1990 - Oct 1 0:00 0 -
Rule Libya 1990 only - May 4 0:00 1:00 S
Rule Libya 1996 only - Mar 30 2:00s 1:00 S
Rule Libya 1996 only - Sep 30 2:00s 0 -
-Rule Libya 1997 max - Mar lastThu 2:00s 1:00 S
-Rule Libya 1997 max - Oct Thu>=1 2:00s 0 -
+Rule Libya 1997 only - Apr 4 0:00 1:00 S
+Rule Libya 1997 only - Oct 4 0:00 0 -
# Zone NAME GMTOFF RULES FORMAT [UNTIL]
Zone Africa/Tripoli 0:52:44 - LMT 1920
1:00 Libya CE%sT 1959
2:00 - EET 1982
1:00 Libya CE%sT 1991
2:00 - EET 1996 Mar 30 3:00
- 1:00 Libya CE%sT
+ 1:00 Libya CE%sT 1997 Oct 4 0:00
+ 2:00 - EET
# Madagascar
# Zone NAME GMTOFF RULES FORMAT [UNTIL]
===================================================================
RCS file: RCS/asia,v
retrieving revision 1998.5
retrieving revision 1998.5.1.1
diff -p -u -r1998.5 -r1998.5.1.1
--- asia 1998/05/28 13:56:14 1998.5
+++ asia 1998/09/23 00:18:21 1998.5.1.1
@@ -7,8 +7,8 @@
# From Paul Eggert <eggert at twinsun.com> (1996-11-22):
#
# 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).
+# Thomas G. Shanks, The International Atlas (4th edition),
+# San Diego: ACS Publications, Inc. (1995).
# Except where otherwise noted, it is the source for the data below.
#
# Gwillim Law <LAW at encmail.encompass.com> writes that a good source
@@ -78,24 +78,30 @@ Zone Asia/Kabul 4:36:48 - LMT 1890
4:30 - AFT
# Armenia
-# From Paul Eggert (1996-05-04):
+# From Paul Eggert (1998-??-??):
# Shanks has Yerevan switching to 3:00 (with Russian DST) in spring 1991,
# but usno1995 has Armenia at 4:00 (with DST), and Edgar Der-Danieliantz
-# <edd at AIC.NET> reported today that Yerevan probably won't use DST this year,
-# though it did use DST in 1995. We guess Yerevan stayed in sync with Moscow
-# between 1990 and 1995, but stopped using DST in 1996.
-# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
-Rule Armenia 1991 1995 - Mar lastSun 2:00s 1:00 S
-Rule Armenia 1991 1995 - Sep lastSun 2:00s 0 -
+# <edd at AIC.NET> reported (1996-05-04) that Yerevan probably wouldn't use DST
+# in 1996, though it did use DST in 1995. IATA SSIM (1991/1998) reports that
+# Armenia switched from 3:00 to 4:00 in 1998 and observed DST after 1991,
+# but started switching at 3:00s in 1998.
+# What a mess! We guess Yerevan DST stayed in sync with Moscow between 1990
+# and 1995, did not use DST in 1996, and started using DST again in 1997.
# Zone NAME GMTOFF RULES FORMAT [UNTIL]
Zone Asia/Yerevan 2:58:00 - LMT 1924 May 2
3:00 - YERT 1957 Mar # Yerevan Time
4:00 RussiaAsia YER%sT 1991 Mar 31 2:00s
3:00 1:00 YERST 1991 Sep 23 # independence
- 3:00 Armenia AM%sT 1992 Jan 19 2:00s # Armenia Time
- 4:00 Armenia AM%sT
+ 3:00 1:00 AMST 1991 Sep 29 2:00s # Armenia Time
+ 3:00 - AMT 1992 Jan 19 2:00s
+ 4:00 RussiaAsia AM%sT 1996
+ 4:00 - AMT 1997
+ 4:00 RussiaAsia AM%sT
# Azerbaijan
+# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
+Rule Azer 1997 max - Mar lastSun 1:00 1:00 S
+Rule Azer 1997 max - Oct lastSun 1:00 0 -
# Zone NAME GMTOFF RULES FORMAT [UNTIL]
Zone Asia/Baku 3:19:24 - LMT 1924 May 2
3:00 - BAKT 1957 Mar # Baku Time
@@ -103,7 +109,8 @@ Zone Asia/Baku 3:19:24 - LMT 1924 May 2
3:00 1:00 BAKST 1991 Aug 30 # independence
3:00 RussiaAsia AZ%sT 1992 Sep lastSun 2:00s
4:00 - AZT 1996 # Azerbaijan time
- 4:00 EUAsia AZ%sT
+ 4:00 EUAsia AZ%sT 1997
+ 4:00 Azer AZ%sT
# Bahrain
# Zone NAME GMTOFF RULES FORMAT [UNTIL]
@@ -183,7 +190,7 @@ Zone Asia/Phnom_Penh 6:59:40 - LMT 1906
# note about Time magazine, though apparently _something_ happened in 1986.
# Go with Shanks for now. I made up names for the other pre-1980 time zones.
-# From Shanks (1991):
+# From Shanks (1995):
# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
Rule Shang 1940 only - Jun 3 0:00 1:00 D
Rule Shang 1940 1941 - Oct 1 0:00 0 S
@@ -458,12 +465,7 @@ Zone Asia/Baghdad 2:57:40 - LMT 1890
# ISRAEL 2 H AHEAD OF UTC
# ISRAEL 3 H AHEAD OF UTC APR 10 - SEP 3
-# From Paul Eggert <eggert at twinsun.com> (1993-11-18):
-#
-# Shanks gives the following rules for Jerusalem from 1918 through 1991.
-# After 1989 Shanks often disagrees with Silverberg; we go with Silverberg.
-
-# From Shanks (1991):
+# From Shanks (1995):
# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
Rule Zion 1940 only - Jun 1 0:00 1:00 D
Rule Zion 1942 1944 - Nov 1 0:00 0 S
@@ -569,6 +571,12 @@ Rule Zion 1997 only - Sep 14 0:00 0 S
Rule Zion 1998 only - Mar 20 0:00 1:00 D
Rule Zion 1998 only - Sep 6 0:00 0 S
+# From Member of Knesset Avraham Poraz, as quoted in Ha'aretz (1998-09-02):
+# [The 1998-09-06 transition is to] serve the interests of a small minority
+# of ultra-Orthodox Sephardic Jews who, during the [Hebrew] month of Elul,
+# recite Slihot penitential prayers in the early morning hours
+# and thus find daylight time inconvenient.
+
# From Paul Eggert (1998-01-12):
# Here are guesses for rules after 1998.
# They are probably wrong, but they are more likely than no DST at all.
@@ -644,7 +652,7 @@ Zone Asia/Amman 2:23:44 - LMT 1931
# IATA SSIM mentions a third time zone in Kazakhstan.
#
# Zone NAME GMTOFF RULES FORMAT [UNTIL]
-Zone Asia/Alma-Ata 5:07:48 - LMT 1924 May 2 # or Almaty
+Zone Asia/Almaty 5:07:48 - LMT 1924 May 2 # or Alma-Ata
5:00 - ALMT 1957 Mar # Alma-Ata Time
6:00 RussiaAsia ALM%sT 1991 Mar 31 2:00s
5:00 1:00 ALMST 1991 Sep 29 2:00s
@@ -666,11 +674,13 @@ Zone Asia/Aqtau 3:21:04 - LMT 1924 May
# Kirgizstan
# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
-Rule Kirgiz 1992 max - Apr Sun>=7 0:00 1:00 S
-Rule Kirgiz 1991 max - Sep lastSun 0:00 0 -
+Rule Kirgiz 1992 1996 - Apr Sun>=7 0:00 1:00 S
+Rule Kirgiz 1991 1996 - Sep lastSun 0:00 0 -
+Rule Kirgiz 1997 max - Mar lastSun 2:30 1:00 S
+Rule Kirgiz 1997 max - Oct lastSun 2:30 0 -
# Zone NAME GMTOFF RULES FORMAT [UNTIL]
Zone Asia/Bishkek 4:58:24 - LMT 1924 May 2
- 5:00 - FRUT 1957 Mar # Frunze Time
+ 5:00 - FRUT 1930 Jun 21 # Frunze Time
6:00 RussiaAsia FRU%sT 1991 Mar 31 2:00s
5:00 1:00 FRUST 1991 Aug 31 # independence
5:00 Kirgiz KG%sT # Kirgizstan Time
@@ -684,7 +694,7 @@ Zone Asia/Bishkek 4:58:24 - LMT 1924 May
# Daylight Savings Time was not observed until 1987. He did not know
# at what time of day DST starts or ends.
-# From Shanks (1991):
+# From Shanks (1995):
# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
Rule ROK 1960 only - May 15 0:00 1:00 D
Rule ROK 1960 only - Sep 13 0:00 0 S
@@ -957,7 +967,7 @@ Zone Asia/Singapore 6:55:24 - LMT 1880
# </a>
# reported ``the country's standard time will be put forward by one hour at
# midnight Friday (1830 GMT) `in the light of the present power crisis'.''
-# Transitions before 1996 are from Shanks (1991).
+# Transitions before 1996 are from Shanks (1995).
#
# From Dharmasiri Senanayake, Sri Lanka Media Minister (1996-10-24), as quoted
# by Shamindra in
@@ -969,7 +979,7 @@ Zone Asia/Singapore 6:55:24 - LMT 1880
# Zone NAME GMTOFF RULES FORMAT [UNTIL]
Zone Asia/Colombo 5:19:24 - LMT 1880
- 5:20 - CEYT 1906 # Ceylon Time
+ 5:19:32 - MMT 1906 # Moratuwa Mean Time
5:30 - IST 1942 Jan 5
5:30 0:30 IHST 1942 Sep
5:30 1:00 IST 1945 Oct 16 2:00
@@ -1007,7 +1017,8 @@ Rule Syria 1991 1992 - Oct 1 0:00 0 -
Rule Syria 1992 only - Apr 8 0:00 1:00 S
Rule Syria 1993 only - Mar 26 0:00 1:00 S
Rule Syria 1993 only - Sep 25 0:00 0 -
-# IATA SSIM (1996-09) says 1997-03-31; assume that it should be 1997-04-01.
+# IATA SSIM (1996-09) says 1997-03-31; (1998-02) says 1998-04-02,
+# 1999-03-29, and 1999-09-29; ignore all these claims for now.
Rule Syria 1994 max - Apr 1 0:00 1:00 S
Rule Syria 1994 max - Oct 1 0:00 0 -
# Zone NAME GMTOFF RULES FORMAT [UNTIL]
@@ -1015,9 +1026,10 @@ Zone Asia/Damascus 2:25:12 - LMT 1920
2:00 Syria EE%sT
# Tajikistan
+# From Shanks (1995), who writes ``date of change uncertain'' for 1991.
# Zone NAME GMTOFF RULES FORMAT [UNTIL]
Zone Asia/Dushanbe 4:35:12 - LMT 1924 May 2
- 5:00 - DUST 1957 Mar # Dushanbe Time
+ 5:00 - DUST 1930 Jun 21 # Dushanbe Time
6:00 RussiaAsia DUS%sT 1991 Mar 31 2:00s
5:00 1:00 DUSST 1991 Sep 9 # independence
5:00 RussiaAsia TJ%sT 1992
@@ -1030,14 +1042,17 @@ Zone Asia/Bangkok 6:42:04 - LMT 1880
7:00 - ICT
# Turkmenistan
+# From Shanks (1995):
# Zone NAME GMTOFF RULES FORMAT [UNTIL]
Zone Asia/Ashkhabad 3:53:32 - LMT 1924 May 2 # or Ashgabat
- 4:00 - ASHT 1957 Mar # Ashkhabad Time
- 5:00 RussiaAsia ASH%sT 1991 Mar 31 2:00s
- 4:00 1:00 ASHST 1991 Sep 29 2:00s
- 4:00 - ASHT 1991 Oct 27 # independence
- 4:00 - TMT 1992 Jan 19 2:00s
- 5:00 - TMT # Turkmenistan Time
+ 4:00 - ASHT 1930 Jun 21 # Ashkhabad Time
+ 5:00 - ASHT 1981 Apr 1
+ 5:00 1:00 ASHST 1981 Oct 1
+ 6:00 - ASHT 1982 Apr 1
+ 5:00 RussiaAsia ASH%sT 1991
+ 5:00 - ASHT 1991 Oct 27 # independence
+ 5:00 RussiaAsia TM%sT 1993 # Turkmenistan Time
+ 5:00 - TMT
# United Arab Emirates
# Zone NAME GMTOFF RULES FORMAT [UNTIL]
@@ -1045,14 +1060,24 @@ Zone Asia/Dubai 3:41:12 - LMT 1920
4:00 - GST
# Uzbekistan
+# From Shanks (1995):
# Zone NAME GMTOFF RULES FORMAT [UNTIL]
+Zone Asia/Samarkand 4:27:12 - LMT 1924 May 2
+ 4:00 - SAMT 1930 Jun 21 # Samarkand Time
+ 5:00 - SAMT 1981 Apr 1
+ 5:00 1:00 SAMST 1981 Oct 1
+ 6:00 RussiaAsia TAS%sT 1991 Mar 31 2:00 # Tashkent Time
+ 5:00 - TAST 1991 Sep 1 # independence
+ 5:00 - UZT 1992
+ 5:00 RussiaAsia UZ%sT 1993
+ 5:00 - UZT
Zone Asia/Tashkent 4:37:12 - LMT 1924 May 2
- 5:00 - TAST 1957 Mar # Tashkent Time
+ 5:00 - TAST 1930 Jun 21 # Tashkent Time
6:00 RussiaAsia TAS%sT 1991 Mar 31 2:00s
- 5:00 1:00 TASST 1991 Sep 29 2:00s
- 5:00 - UZT # Uzbekistan Time
-# Shanks has Tashkent using DST after 1991, but usno1995 says they don't.
-# Guess no DST after 1991.
+ 5:00 - TAST 1991 Sep 1 # independence
+ 5:00 - UZT 1992
+ 5:00 RussiaAsia UZ%sT 1993
+ 5:00 - UZT
# Vietnam
# From Paul Eggert <eggert at twinsun.com> (1993-11-18):
===================================================================
RCS file: RCS/australasia,v
retrieving revision 1998.5
retrieving revision 1998.5.1.1
diff -p -u -r1998.5 -r1998.5.1.1
--- australasia 1998/05/28 13:56:14 1998.5
+++ australasia 1998/09/23 00:18:21 1998.5.1.1
@@ -181,10 +181,11 @@ Zone Indian/Christmas 7:02:52 - LMT 1895
7:00 - CXT # Christmas Island Time
# Cook Is
+# From Shanks (1995):
# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
Rule Cook 1978 only - Nov 12 0:00 0:30 HS
-Rule Cook 1979 max - Mar Sun>=1 0:00 0 -
-Rule Cook 1979 max - Oct lastSun 0:00 0:30 HS
+Rule Cook 1979 1991 - Mar Sun>=1 0:00 0 -
+Rule Cook 1979 1990 - Oct lastSun 0:00 0:30 HS
# Zone NAME GMTOFF RULES FORMAT [UNTIL]
Zone Pacific/Rarotonga -10:39:04 - LMT 1901 # Avarua
-10:30 - CKT 1978 Nov 12 # Cook Is Time
@@ -270,9 +271,8 @@ Zone Pacific/Nauru 11:07:40 - LMT 1921 J
# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
Rule NC 1977 1978 - Dec Sun>=1 0:00 1:00 S
Rule NC 1978 1979 - Feb 27 0:00 0 -
-Rule NC 1996 only - Dec 1 2:00s 1:00 S
-Rule NC 1997 max - Mar Sun>=1 2:00s 0 -
-Rule NC 1997 max - Nov lastSun 2:00s 1:00 S
+Rule NC 1996 only - Dec 1 2:00s 1:00 S
+Rule NC 1997 only - Mar 2 2:00s 0 -
# Zone NAME GMTOFF RULES FORMAT [UNTIL]
Zone Pacific/Noumea 11:05:48 - LMT 1912 Jan 13
11:00 NC NC%sT
@@ -447,8 +447,8 @@ Zone Pacific/Wallis 12:15:20 - LMT 1901
# From Paul Eggert <eggert at twinsun.com> (1996-11-22):
# 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).
+# Thomas G. Shanks, The International Atlas (4th edition),
+# San Diego: ACS Publications, Inc. (1995).
#
# Gwillim Law <LAW at encmail.encompass.com> writes that a good source
# for recent time zone data is the International Air Transport
@@ -834,7 +834,7 @@ Zone Pacific/Wallis 12:15:20 - LMT 1901
# hour ahead of NSW time.
# From Paul Eggert (1995-12-19):
-# For Lord Howe we use Shanks through its time of publication (1991).
+# For Lord Howe we use Shanks through 1991.
# Lord Howe is part of NSW, so we'll guess it has used the same transition
# times as NSW since 1991, even though Shanks writes that Lord Howe went
# with Victoria when NSW and Victoria disagreed in 1982.
===================================================================
RCS file: RCS/europe,v
retrieving revision 1998.7
retrieving revision 1998.7.1.1
diff -p -u -r1998.7 -r1998.7.1.1
--- europe 1998/08/11 03:12:57 1998.7
+++ europe 1998/09/23 00:18:21 1998.7.1.1
@@ -6,8 +6,8 @@
# From Paul Eggert <eggert at twinsun.com> (1996-11-22):
# 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).
+# Thomas G. Shanks, The International Atlas (4th edition),
+# San Diego: ACS Publications, Inc. (1995).
#
# Gwillim Law <LAW at encmail.encompass.com> writes that a good source
# for recent time zone data is the International Air Transport
@@ -951,10 +951,14 @@ Rule Russia 1921 only - Feb 14 23:00 1:0
Rule Russia 1921 only - Mar 20 23:00 2:00 DS
Rule Russia 1921 only - Sep 1 0:00 1:00 S
Rule Russia 1921 only - Oct 1 0:00 0 -
+# Act No.925 of the Council of Ministers of the USSR (1980-10-24):
Rule Russia 1981 1984 - Apr 1 0:00 1:00 S
Rule Russia 1981 1983 - Oct 1 0:00 0 -
+# Act No.967 of the Council of Ministers of the USSR (1984-09-13), repeated in
+# Act No.227 of the Council of Ministers of the USSR (1989-03-14):
Rule Russia 1984 1991 - Sep lastSun 2:00s 0 -
Rule Russia 1985 1991 - Mar lastSun 2:00s 1:00 S
+#
Rule Russia 1992 only - Mar lastSat 23:00 1:00 S
Rule Russia 1992 only - Sep lastSat 23:00 0 -
Rule Russia 1993 max - Mar lastSun 2:00s 1:00 S
@@ -1056,15 +1060,17 @@ Zone Europe/Vienna 1:05:20 - LMT 1893 Ap
1:00 EU CE%sT
# Belarus
+# Transitions before 1991 are from Shanks (1995).
# Zone NAME GMTOFF RULES FORMAT [UNTIL]
Zone Europe/Minsk 1:50:16 - LMT 1880
- 2:30:20 Russia %s 1919 Jul 1 2:00
- 3:00 Russia MSK/MSD 1922 Oct
+ 1:50 - MMT 1924 May 2 # Minsk Mean Time
2:00 - EET 1930 Jun 21
+ 3:00 - MSK 1941 Jun 28
+ 1:00 C-Eur CE%sT 1944 Jul 3
3:00 Russia MSK/MSD 1991 Mar 31 2:00s
2:00 1:00 EEST 1991 Sep 29 2:00s
- 2:00 - EET 1992 Mar 29 0:00
- 2:00 1:00 EEST 1992 Sep 27 0:00
+ 2:00 - EET 1992 Mar 29 2:00s
+ 2:00 1:00 EEST 1992 Sep 27 2:00s
2:00 Russia EE%sT
# Belgium
@@ -1244,7 +1250,8 @@ Zone Europe/Tallinn 1:39:00 - LMT 1880
1:00 C-Eur CE%sT 1944 Sep 22
3:00 Russia MSK/MSD 1989 Mar 26 2:00s
2:00 1:00 EEST 1989 Sep 24 2:00s
- 2:00 C-Eur EE%sT
+ 2:00 C-Eur EE%sT 1998
+ 2:00 EU EE%sT
# Finland
# See Sweden for when the Gregorian calendar was adopted.
@@ -1570,14 +1577,45 @@ Link Europe/Rome Europe/Vatican
Link Europe/Rome Europe/San_Marino
# Latvia
-# From Paul Eggert (1996-11-22):
-# Rules after 1991 are by extension from Shanks. They contradict
-# IATA SSIM (1992/1996), which claims Latvia uses W-Eur rules, but
-# Peter Ilieve's relative writes that Latvia switched in September this year,
-# so we'll assume that the old C-Eur-style rules still apply.
+
+# From Liene Kanepe <Liene_Kanepe at lm.gov.lv> (1998-09-17):
+
+# I asked about this matter Scientific Secretary of the Institute of Astronomy
+# of The University of Latvia Dr. paed Mr. Ilgonis Vilks. I also searched the
+# correct data in juridical acts and I found some juridical documents about
+# changes in the counting of time in Latvia from 1981....
+#
+# Act No.35 of the Council of Ministers of Latvian SSR of 1981-01-22 ...
+# according to the Act No.925 of the Council of Ministers of USSR of 1980-10-24
+# ...: all year round the time of 2nd time zone + 1 hour, in addition turning
+# the hands of the clock 1 hour forward on 1 April at 00:00 (GMT 31 March 21:00)
+# and 1 hour backward on the 1 October at 00:00 (GMT 30 September 20:00).
+#
+# Act No.592 of the Council of Ministers of Latvian SSR of 1984-09-24 ...
+# according to the Act No.967 of the Council of Ministers of USSR of 1984-09-13
+# ...: all year round the time of 2nd time zone + 1 hour, in addition turning
+# the hands of the clock 1 hour forward on the last Sunday of March at 02:00
+# (GMT 23:00 on the previous day) and 1 hour backward on the last Sunday of
+# September at 03:00 (GMT 23:00 on the previous day).
+#
+# Act No.81 of the Council of Ministers of Latvian SSR of 1989-03-22 ...
+# according to the Act No.227 of the Council of Ministers of USSR of 1989-03-14
+# ...: since the last Sunday of March 1989 in Lithuanian SSR, Latvian SSR,
+# Estonian SSR and Kaliningrad region of Russian Federation all year round the
+# time of 2nd time zone (Moscow time minus one hour). On the territory of Latvia
+# transition to summer time is performed on the last Sunday of March at 02:00
+# (GMT 00:00), turning the hands of the clock 1 hour forward. The end of
+# daylight saving time is performed on the last Sunday of September at 03:00
+# (GMT 00:00), turning the hands of the clock 1 hour backward. Exception is
+# 1989-03-26, when we must not turn the hands of the clock....
+#
+# The Regulations of the Cabinet of Ministers of the Republic of Latvia of
+# 1997-01-21 on transition to Summer time ... established the same order of
+# daylight savings time settings as in the States of the European Union.
+
# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
-Rule Latvia 1992 max - Mar lastSun 2:00s 1:00 S
-Rule Latvia 1992 max - Sep lastSun 2:00s 0 -
+Rule Latvia 1989 1996 - Mar lastSun 2:00s 1:00 S
+Rule Latvia 1989 1996 - Sep lastSun 2:00s 0 -
# Zone NAME GMTOFF RULES FORMAT [UNTIL]
Zone Europe/Riga 1:36:24 - LMT 1880
1:36:24 - RMT 1918 Apr 15 2:00 #Riga Mean Time
@@ -1587,10 +1625,13 @@ Zone Europe/Riga 1:36:24 - LMT 1880
1:36:24 - RMT 1926 May 11
2:00 - EET 1940 Aug 5
3:00 - MSK 1941 Jul
- 1:00 C-Eur CE%sT 1944 Aug 8
- 3:00 Russia MSK/MSD 1991 Mar 31 2:00s
- 2:00 1:00 EEST 1991 Sep 29 2:00s
- 2:00 Latvia EE%sT
+ 1:00 C-Eur CE%sT 1944 Oct 13
+ # Shanks says 1944-08-08, but
+ # Riga fell to the Red Army on 1944-10-13.
+ 3:00 Russia MSK/MSD 1989 Mar lastSun 2:00s
+ 2:00 1:00 EEST 1989 Sep lastSun 2:00s
+ 2:00 Latvia EE%sT 1997 Jan 21
+ 2:00 EU EE%sT
# Liechtenstein
# Zone NAME GMTOFF RULES FORMAT [UNTIL]
@@ -1610,8 +1651,9 @@ Zone Europe/Vilnius 1:41:16 - LMT 1880
1:00 C-Eur CE%sT 1944 Aug
3:00 Russia MSK/MSD 1991 Mar 31 2:00s
2:00 1:00 EEST 1991 Sep 29 2:00s
- 2:00 C-Eur EE%sT 1998 Mar 29 2:00s
- 1:00 C-Eur CE%sT
+ 2:00 C-Eur EE%sT 1998
+ 2:00 - EET 1998 Mar 29 1:00u
+ 1:00 EU CE%sT
# From Paul Eggert (1996-11-22):
# IATA SSIM (1992/1996) says Lithuania uses W-Eur rules, but since it is
# known to be wrong about Estonia and Latvia, assume it's wrong here too.
@@ -2262,8 +2304,8 @@ Rule Crimea 1921 only - Feb 14 23:00 1:0
Rule Crimea 1921 only - Mar 21 23:00 2:00 CDST
Rule Crimea 1921 only - Sep 1 0:00 1:00 CST
Rule Crimea 1921 only - Oct 1 0:00 0 NMT
-Rule Crimea 1996 max - Mar lastSun 0:00u 1:00 -
-Rule Crimea 1996 max - Oct lastSun 0:00u 0 -
+Rule Crimea 1996 only - Mar lastSun 0:00u 1:00 -
+Rule Crimea 1996 only - Oct lastSun 0:00u 0 -
# Zone NAME GMTOFF RULES FORMAT [UNTIL]
Zone Europe/Kiev 2:02:04 - LMT 1880
2:02:04 Ukraine %s 1924 May 2
@@ -2281,9 +2323,12 @@ Zone Europe/Simferopol 2:16:24 - LMT 188
# from Kiev to Moscow time sometime after the January 1994 elections.
# For now, guess it changed Feb 1.
2:00 C-Eur EE%sT 1994 Feb
-# From IATA SSIM (1994/1996), which also says that Kerch is still like Kiev.
+# From IATA SSIM (1994/1997), which also says that Kerch is still like Kiev.
3:00 E-Eur MSK/MSD 1996
- 3:00 Crimea MSK/MSD
+# IATA SSIM (1997-09) says Crimea switched to EET/EEST.
+# Assume it happened in March by not changing the clocks.
+ 3:00 Crimea MSK/MSD 1997 Mar lastSun 1:00u
+ 2:00 EU EE%sT
# Yugoslavia
# Zone NAME GMTOFF RULES FORMAT [UNTIL]
===================================================================
RCS file: RCS/northamerica,v
retrieving revision 1998.5
retrieving revision 1998.5.1.1
diff -p -u -r1998.5 -r1998.5.1.1
--- northamerica 1998/05/28 13:56:16 1998.5
+++ northamerica 1998/09/23 00:18:21 1998.5.1.1
@@ -459,8 +459,8 @@ Link Pacific/Honolulu HST
# From Paul Eggert <eggert at twinsun.com> (1996-11-22):
# A good source for time zone historical data outside the US is
-# Thomas G. Shanks, The International Atlas (3rd edition),
-# San Diego: ACS Publications, Inc. (1991).
+# Thomas G. Shanks, The International Atlas (4th edition),
+# San Diego: ACS Publications, Inc. (1995).
#
# Gwillim Law <LAW at encmail.encompass.com> writes that a good source
# for recent time zone data is the International Air Transport
@@ -1002,6 +1002,12 @@ Rule BajaN 1950 1966 - Apr lastSun 2:00
Rule BajaN 1950 1961 - Sep lastSun 2:00 0 S
Rule BajaN 1961 1966 - Oct lastSun 2:00 0 S
# Zone NAME GMTOFF RULES FORMAT [UNTIL]
+# Quintana Roo
+Zone America/Cancun -5:47:04 - LMT 1922 Jan 1 1:12:42
+ -6:00 - CST 1996
+ -6:00 Mexico C%sT 1997 Oct lastSun 2:00
+ -5:00 Mexico E%sT
+# Central Mexico
Zone America/Mexico_City -6:36:36 - LMT 1922 Jan 1 0:23:24
-7:00 - MST 1927 Jun 10 23:00
-6:00 - CST 1930 Nov 15
@@ -1009,6 +1015,18 @@ Zone America/Mexico_City -6:36:36 - LMT
-6:00 - CST 1931 Oct
-7:00 - MST 1932 Mar 30 23:00
-6:00 Mexico C%sT
+# Chihuahua
+Zone America/Chihuahua -7:04:20 - LMT 1921 Dec 31 23:55:44
+ -7:00 - MST 1927 Jun 10 23:00
+ -6:00 - CST 1930 Nov 15
+ -7:00 - MST 1931 May 1 23:00
+ -6:00 - CST 1931 Oct
+ -7:00 - MST 1932 Mar 30 23:00
+ -6:00 - CST 1996
+ -6:00 Mexico C%sT 1998
+ -6:00 - CST 1998 Apr Sun>=1 3:00
+ -7:00 Mexico M%sT
+# S Baja California, Nayarit, Sinaloa, Sonora
Zone America/Mazatlan -7:05:40 - LMT 1921 Dec 31 23:54:20
-7:00 - MST 1927 Jun 10 23:00
-6:00 - CST 1930 Nov 15
@@ -1019,6 +1037,7 @@ Zone America/Mazatlan -7:05:40 - LMT 192
-7:00 - MST 1949 Jan 14
-8:00 - PST 1970
-7:00 Mexico M%sT
+# N Baja California
Zone America/Tijuana -7:48:04 - LMT 1922 Jan 1 0:11:56
-8:00 - PST 1927 Jun 10 23:00
-7:00 - MST 1930 Nov 16
@@ -1027,6 +1046,7 @@ Zone America/Tijuana -7:48:04 - LMT 1922
-8:00 BajaN P%sT 1967 Apr lastSun 2:00
-8:00 US P%sT 1996
-8:00 Mexico P%sT
+# Baja California
Zone America/Ensenada -7:46:28 - LMT 1922 Jan 1 0:13:32
-8:00 - PST 1927 Jun 10 23:00
-7:00 - MST 1930 Nov 16
@@ -1069,7 +1089,7 @@ 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 - BMT 1932 # Bridgetown Mean Time
+ -3:58:28 - BMT 1932 # Bridgetown Mean Time
-4:00 Barb A%sT
# Belize
@@ -1094,7 +1114,7 @@ Zone Atlantic/Bermuda -4:19:04 - LMT 193
# Cayman Is
# Zone NAME GMTOFF RULES FORMAT [UNTIL]
Zone America/Cayman -5:25:32 - LMT 1890 # Georgetown
- -5:07 - KMT 1912 Feb # Kingston Mean Time
+ -5:07:12 - KMT 1912 Feb # Kingston Mean Time
-5:00 - EST
# Costa Rica
@@ -1150,10 +1170,13 @@ Rule Cuba 1978 1990 - Oct Sun>=8 0:00 0
Rule Cuba 1979 1980 - Mar Sun>=15 0:00 1:00 D
Rule Cuba 1981 1985 - May Sun>=5 0:00 1:00 D
Rule Cuba 1986 1989 - Mar Sun>=14 0:00 1:00 D
-Rule Cuba 1990 max - Apr Sun>=1 0:00 1:00 D
+Rule Cuba 1990 1997 - Apr Sun>=1 0:00 1:00 D
Rule Cuba 1991 1995 - Oct Sun>=8 0:00s 0 S
-Rule Cuba 1996 only - Oct Sun>=1 0:00s 0 S
-Rule Cuba 1997 max - Oct Sun>=8 0:00s 0 S
+Rule Cuba 1996 only - Oct 6 0:00s 0 S
+Rule Cuba 1997 only - Oct 12 0:00s 0 S
+Rule Cuba 1998 only - Mar 29 0:00 1:00 D
+Rule Cuba 1998 max - Oct lastSun 0:00s 0 S
+Rule Cuba 1999 max - Apr Sun>=1 0:00s 1:00 D
# Zone NAME GMTOFF RULES FORMAT [UNTIL]
Zone America/Havana -5:29:28 - LMT 1890
@@ -1216,8 +1239,8 @@ Rule Haiti 1983 only - May 8 0:00 1:00 D
Rule Haiti 1984 1987 - Apr lastSun 0:00 1:00 D
Rule Haiti 1983 1987 - Oct lastSun 0:00 0 S
# Shanks says AT is 2:00, but IATA SSIM (1991/1996) says 1:00s. Go with IATA.
-Rule Haiti 1988 max - Apr Sun>=1 1:00s 1:00 D
-Rule Haiti 1988 max - Oct lastSun 1:00s 0 S
+Rule Haiti 1988 1997 - Apr Sun>=1 1:00s 1:00 D
+Rule Haiti 1988 1997 - Oct lastSun 1:00s 0 S
# Zone NAME GMTOFF RULES FORMAT [UNTIL]
Zone America/Port-au-Prince -4:49:20 - LMT 1890
-4:49 - PPMT 1917 Jan 24 12:00 # P-a-P MT
@@ -1240,7 +1263,7 @@ Zone America/Tegucigalpa -5:48:52 - LMT
# From Shanks (1991):
# Zone NAME GMTOFF RULES FORMAT [UNTIL]
Zone America/Jamaica -5:07:12 - LMT 1890 # Kingston
- -5:07 - KMT 1912 Feb # Kingston Mean Time
+ -5:07:12 - KMT 1912 Feb # Kingston Mean Time
-5:00 - EST 1974 Jan 6 2:00
-5:00 US E%sT 1984
-5:00 - EST
@@ -1310,12 +1333,12 @@ Zone America/Miquelon -3:44:40 - LMT 191
# St Vincent and the Grenadines
# Zone NAME GMTOFF RULES FORMAT [UNTIL]
Zone America/St_Vincent -4:04:56 - LMT 1890 # Kingstown
- -4:05 - KMT 1912 # Kingstown Mean Time
+ -4:04:56 - KMT 1912 # Kingstown Mean Time
-4:00 - AST
# Turks and Caicos
-# From Paul Eggert (1996-11-22):
-# Shanks says they use US DST rules, but IATA SSIM (1991/1996)
+# From Paul Eggert (1998-08-06):
+# Shanks says they use US DST rules, but IATA SSIM (1991/1998)
# says they switch at midnight. Go with IATA SSIM.
# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
Rule TC 1979 1986 - Apr lastSun 0:00 1:00 D
@@ -1323,7 +1346,7 @@ Rule TC 1979 max - Oct lastSun 0:00 0 S
Rule TC 1987 max - Apr Sun>=1 0:00 1:00 D
# Zone NAME GMTOFF RULES FORMAT [UNTIL]
Zone America/Grand_Turk -4:44:32 - LMT 1890
- -5:07 - KMT 1912 Feb # Kingston Mean Time
+ -5:07:12 - KMT 1912 Feb # Kingston Mean Time
-5:00 TC E%sT
# British Virgin Is
===================================================================
RCS file: RCS/southamerica,v
retrieving revision 1998.3
retrieving revision 1998.3.1.1
diff -p -u -r1998.3 -r1998.3.1.1
--- southamerica 1998/02/28 17:32:26 1998.3
+++ southamerica 1998/09/23 00:18:21 1998.3.1.1
@@ -6,8 +6,8 @@
# From Paul Eggert <eggert at twinsun.com> (1996-11-22):
# 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).
+# Thomas G. Shanks, The International Atlas (4th edition),
+# San Diego: ACS Publications, Inc. (1995).
#
# Gwillim Law <LAW at encmail.encompass.com> writes that a good source
# for recent time zone data is the International Air Transport
@@ -310,6 +310,8 @@ Zone America/Fortaleza -2:34:00 - LMT 19
-3:00 - EST
#
# Alagoas, Sergipe, Tocantins
+# IATA SSIM (1996/1998) keeps bouncing back and forth as to whether
+# Alagoas and Sergipe observe DST. For now, continue to assume that they do.
Zone America/Maceio -2:22:52 - LMT 1914
-3:00 - EST 1963 Dec 9
-3:00 Brazil E%sT 1990 Jul
@@ -375,6 +377,7 @@ Zone Pacific/Easter -7:17:28 - LMT 1890
# Colombia
# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
Rule CO 1992 only - May 2 0:00 1:00 S
+# Shanks (1995) estimates 1993-04-03 24:00 for this; go with IATA.
Rule CO 1992 only - Dec 31 0:00 0 -
# Zone NAME GMTOFF RULES FORMAT [UNTIL]
Zone America/Bogota -4:56:20 - LMT 1884 Mar 13
@@ -384,6 +387,10 @@ Zone America/Bogota -4:56:20 - LMT 1884
# no information; probably like America/Bogota
# Curacao
+# Shanks (1995) says that Bottom and Oranjestad have been at -4:00 since
+# standard time was introduced on 1912-03-02; and that Kralendijk and Rincon
+# used Kralendijk Mean Time (-4:33:08) from 1912-02-02 to 1965-01-01.
+# This all predates our 1970 cutoff, though.
# Zone NAME GMTOFF RULES FORMAT [UNTIL]
Zone America/Curacao -4:35:44 - LMT 1912 Feb 12 # Willemstad
-4:30 - ANT 1965 # Netherlands Antilles Time
@@ -458,9 +465,11 @@ Rule Para 1992 only - Oct 5 0:00 1:00 S
Rule Para 1993 only - Mar 31 0:00 0 -
Rule Para 1993 1995 - Oct 1 0:00 1:00 S
Rule Para 1994 1995 - Feb lastSun 0:00 0 -
-Rule Para 1996 max - Mar 1 0:00 0 -
-Rule Para 1996 only - Oct 6 0:00 1:00 S
-Rule Para 1997 max - Oct 1 0:00 1:00 S
+Rule Para 1996 1998 - Mar 1 0:00 0 -
+Rule Para 1996 max - Oct Sun>=1 0:00 1:00 S
+# IATA SSIM (1998-02) claims that the 1999 switch will be on 02-27.
+# Assume this is a typo, and that 02-28 was meant.
+Rule Para 1999 max - Feb lastSun 0:00 0 -
# Zone NAME GMTOFF RULES FORMAT [UNTIL]
Zone America/Asuncion -3:50:40 - LMT 1890
-3:50:40 - AMT 1931 Oct 10 # Asuncion Mean Time
===================================================================
RCS file: RCS/zone.tab,v
retrieving revision 1.2.1.8
retrieving revision 1.2.1.8.1.2
diff -p -u -r1.2.1.8 -r1.2.1.8.1.2
--- zone.tab 1998/05/25 07:38:52 1.2.1.8
+++ zone.tab 1998/09/23 01:42:49 1.2.1.8.1.2
@@ -202,7 +202,7 @@ KP +3901+12545 Asia/Pyongyang
KR +3733+12658 Asia/Seoul
KW +2920+04759 Asia/Kuwait
KY +1918-08123 America/Cayman
-KZ +4315+07657 Asia/Alma-Ata east Kazakhstan
+KZ +4315+07657 Asia/Almaty east Kazakhstan
KZ +5017+05710 Asia/Aqtobe central Kazakhstan
KZ +4431+05016 Asia/Aqtau west Kazakhstan
LA +1758+10236 Asia/Vientiane
@@ -236,8 +236,10 @@ MT +3554+01431 Europe/Malta
MU -2010+05730 Indian/Mauritius
MV +0410+07330 Indian/Maldives
MW -1547+03500 Africa/Blantyre
+MX +2105-08646 America/Cancun Eastern Time
MX +1924-09909 America/Mexico_City Central Time
-MX +2313-10625 America/Mazatlan Mountain Time
+MX +2313-10625 America/Mazatlan Mountain Time - most locations
+MX +2838-10605 America/Chihuahua Mountain Time - Chihuahua
MX +3152-11637 America/Ensenada Pacific Time - most locations
MX +3232-11701 America/Tijuana Pacific Time - north Baja California
MY +0310+10142 Asia/Kuala_Lumpur peninsular Malaysia
@@ -354,7 +356,8 @@ US +643004-1652423 America/Nome Alaska T
US +515248-1763929 America/Adak Aleutian Islands
US +211825-1575130 Pacific/Honolulu Hawaii
UY -3453-05611 America/Montevideo
-UZ +4120+06918 Asia/Tashkent
+UZ +3940+06648 Asia/Samarkand west Uzbekistan
+UZ +4120+06918 Asia/Tashkent east Uzbekistan
VA +4154+01227 Europe/Vatican
VC +1309-06114 America/St_Vincent
VE +1030-06656 America/Caracas
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