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authorRoland McGrath <roland@gnu.org>2005-04-30 05:40:51 +0000
committerRoland McGrath <roland@gnu.org>2005-04-30 05:40:51 +0000
commit1829dc46468fe3476af4a08bf83f2649573737ce (patch)
tree559f252e8c856b79258ee17890d39e05d376d510 /timezone/asia
parent450cd55b9ab939cbe74772b2cb4a40239bad227b (diff)
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* timezone/africa: Update from tzdata2005i.
* timezone/asia: Likewise. * timezone/northamerica: Likewise. * timezone/yearistype: Likewise.
Diffstat (limited to 'timezone/asia')
-rw-r--r--timezone/asia41
1 files changed, 31 insertions, 10 deletions
diff --git a/timezone/asia b/timezone/asia
index 915014c..024cb37 100644
--- a/timezone/asia
+++ b/timezone/asia
@@ -1,4 +1,4 @@
-# @(#)asia 7.81
+# @(#)asia 7.82
# This data is by no means authoritative; if you think you know better,
# go ahead and edit the file (and please send any changes to
@@ -476,12 +476,33 @@ Zone Asia/Jayapura 9:22:48 - LMT 1932 Nov
# 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