Thanks for mentioning that; it's higher priority to fix this, as current timestamps are wrong in Nicaragua. Here are proposed changes to the TZ database that take this into account, along with other less-important changes that have been saved up. * Nicaragua is observing DST, as of this weekend. Thanks to Steffen Thorsen for this. * A fix for transitions in 2025 in Iran. Thanks to Oscar van Vlijmen for this info, and to Roozbeh Pournader and Ed Reingold for clarifications about the Iranian calendar. * A comment typo fixed for Mexico, and a table typo (that did not affect any transitions) for Libya. Thanks to Jesper Norgaard Welen for these fixes. =================================================================== RCS file: RCS/northamerica,v retrieving revision 2005.5 retrieving revision 2005.5.0.1 diff -pu -r2005.5 -r2005.5.0.1 --- northamerica 2005/02/07 21:19:42 2005.5 +++ northamerica 2005/04/12 08:11:31 2005.5.0.1 @@ -1427,7 +1427,7 @@ Zone America/Dawson -9:17:40 - LMT 1900 # Shanks reports that Baja was at -8:00 in 1922/1923. # Shanks says the 1930 transition in Baja was 1930-11-16. # Shanks reports no DST during summer 1931. -# Shanks reports a transition at 1032-03-30 23:00, not 1932-04-01. +# Shanks reports a transition at 1932-03-30 23:00, not 1932-04-01. # Shanks does not report transitions for Baja in 1945 or 1948. # Shanks reports southern Mexico transitions on 1981-12-01, not 12-23. # Shanks says Quintana Roo switched to -6:00 on 1982-12-02, and to -5:00 @@ -1931,11 +1931,28 @@ Zone America/Montserrat -4:08:52 - LMT 1 # Nicaragua seems to be back at -6:00 but I have not been able to find when # they changed from -5:00. # +# From Steffen Thorsen (2005-04-12): +# I've got reports from 8 different people that Nicaragua just started +# DST on Sunday 2005-04-10, in order to save energy because of +# expensive petroleum. The exact end date for DST is not yet +# announced, only "September" but some sites also say "mid-September". +# Some background information is available on the President's official site: +# http://www.presidencia.gob.ni/Presidencia/Files_index/Secretaria/Notas%20de%... +# The Decree, no 23-2005 is available here: +# http://www.presidencia.gob.ni/buscador_gaceta/BD/DECRETOS/2005/Decreto%2023-... +# +# From Paul Eggert (2005-04-12): +# The decree doesn't say anything about daylight saving, but for now let's +# assume that it is daylight saving and that they'll switch back on the +# 2nd Sunday in September. +# # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S Rule Nic 1979 1980 - Mar Sun>=16 0:00 1:00 D Rule Nic 1979 1980 - Jun Mon>=23 0:00 0 S Rule Nic 1992 only - Jan 1 4:00 1:00 D Rule Nic 1992 only - Sep 24 0:00 0 S +Rule Nic 2005 only - Apr 10 0:00 1:00 D +Rule Nic 2005 only - Sep 11 0:00 0 S # Zone NAME GMTOFF RULES FORMAT [UNTIL] Zone America/Managua -5:45:08 - LMT 1890 -5:45:12 - MMT 1934 Jun 23 # Managua Mean Time? @@ -1943,7 +1960,7 @@ Zone America/Managua -5:45:08 - LMT 1890 -5:00 - EST 1975 Feb 16 -6:00 Nic C%sT 1993 Jan 1 4:00 -5:00 - EST 1998 Dec - -6:00 - CST + -6:00 Nic C%sT # Panama # Zone NAME GMTOFF RULES FORMAT [UNTIL] =================================================================== RCS file: RCS/africa,v retrieving revision 2001.4 retrieving revision 2001.4.0.1 diff -pu -r2001.4 -r2001.4.0.1 --- africa 2001/10/09 17:31:30 2001.4 +++ africa 2005/04/12 08:11:31 2001.4.0.1 @@ -317,7 +317,7 @@ Rule Libya 1985 only - Apr 6 0:00 1:00 Rule Libya 1986 only - Apr 4 0:00 1:00 S Rule Libya 1986 only - Oct 3 0:00 0 - Rule Libya 1987 1989 - Apr 1 0:00 1:00 S -Rule Libya 1987 1990 - Oct 1 0:00 0 - +Rule Libya 1987 1989 - Oct 1 0:00 0 - # Zone NAME GMTOFF RULES FORMAT [UNTIL] Zone Africa/Tripoli 0:52:44 - LMT 1920 1:00 Libya CE%sT 1959 =================================================================== RCS file: RCS/asia,v retrieving revision 2005.8 retrieving revision 2005.8.0.1 diff -pu -r2005.8 -r2005.8.0.1 --- asia 2005/04/04 15:24:32 2005.8 +++ asia 2005/04/12 08:11:31 2005.8.0.1 @@ -476,12 +476,33 @@ Zone Asia/Jayapura 9:22:48 - LMT 1932 No # Thursday night of Shahrivar, but I can't give exact dates.... # I have also changed the abbreviations to what is considered correct # here in Iran, IRST for regular time and IRDT for daylight saving time. - -# From Paul Eggert (2003-03-15) +# +# From Roozbeh Pournader (2005-04-05): +# The text of the Iranian law, in effect since 1925, clearly mentions +# that the true solar year is the measure, and there is no arithmetic +# leap year calculation involved. There has never been any serious +# plan to change that law.... +# +# From Paul Eggert (2005-04-05): # Go with Shanks before September 1991, and with Pournader thereafter. -# I used Ed Reingold's cal-persia in GNU Emacs 21.2 to check Persian dates. -# The Persian calendar is based on the sun, and dates after around 2050 -# are approximate; stop after 2037 when 32-bit time_t's overflow. +# I used Ed Reingold's cal-persia in GNU Emacs 21.2 to check Persian dates, +# stopping after 2037 when 32-bit time_t's overflow. +# That cal-persia used Birashk's approximation, which disagrees with the solar +# calendar predictions for the year 2025, so I corrected those dates by hand. +# +# From Oscar van Vlijmen (2005-03-30), writing about future +# discrepancies between cal-persia and the Iranian calendar: +# For 2091 solar-longitude-after yields 2091-03-20 08:40:07.7 UT for +# the vernal equinox and that gets so close to 12:00 some local +# Iranian time that the definition of the correct location needs to be +# known exactly, amongst other factors. 2157 is even closer: +# 2157-03-20 08:37:15.5 UT. But the Gregorian year 2025 should give +# no interpretation problem whatsoever. By the way, another instant +# in the near future where there will be a discrepancy between +# arithmetical and astronomical Iranian calendars will be in 2058: +# vernal equinox on 2058-03-20 09:03:05.9 UT. The Java version of +# Reingold's/Dershowitz' calculator gives correctly the Gregorian date +# 2058-03-21 for 1 Farvardin 1437 (astronomical). # # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S Rule Iran 1978 1980 - Mar 21 0:00 1:00 D @@ -519,10 +540,10 @@ Rule Iran 2020 only - Mar 21 0:00 1:00 D Rule Iran 2020 only - Sep 21 0:00 0 S Rule Iran 2021 2023 - Mar 22 0:00 1:00 D Rule Iran 2021 2023 - Sep 22 0:00 0 S -Rule Iran 2024 2025 - Mar 21 0:00 1:00 D -Rule Iran 2024 2025 - Sep 21 0:00 0 S -Rule Iran 2026 2027 - Mar 22 0:00 1:00 D -Rule Iran 2026 2027 - Sep 22 0:00 0 S +Rule Iran 2024 only - Mar 21 0:00 1:00 D +Rule Iran 2024 only - Sep 21 0:00 0 S +Rule Iran 2025 2027 - Mar 22 0:00 1:00 D +Rule Iran 2025 2027 - Sep 22 0:00 0 S Rule Iran 2028 2029 - Mar 21 0:00 1:00 D Rule Iran 2028 2029 - Sep 21 0:00 0 S Rule Iran 2030 2031 - Mar 22 0:00 1:00 D