From 37c27ce43332651049d33f195b3f77ec35d2a694 Mon Sep 17 00:00:00 2001 From: Paul Eggert Date: Thu, 30 Jun 2022 23:38:19 -0500 Subject: [PROPOSED] Iran 1977 fallback was 10-20 not 09-23 * asia (Iran, Asia/Tehran): The 1977 fall-back was on October 20, not September 23. (Thanks to Francis Santoni.) --- NEWS | 4 ++-- asia | 14 +++++++++++--- 2 files changed, 13 insertions(+), 5 deletions(-) diff --git a/NEWS b/NEWS index 09d43f2..e95828d 100644 --- a/NEWS +++ b/NEWS @@ -18,10 +18,10 @@ Unreleased, experimental changes (Thanks to Michael Deckers.) Iran adopted standard time in 1935, not 1946. In 1977 it observed - DST from 03-21 23:00 to 09-23 24:00; its 1978 transitions were on + DST from 03-21 23:00 to 10-20 24:00; its 1978 transitions were on 03-24 and 08-05, not 03-20 and 10-20; and its spring 1979 transition was on 05-27, not 03-21. - (Thanks to Roozbeh Pournader.) + (Thanks to Roozbeh Pournader and Francis Santoni.) Changes to zone name diff --git a/asia b/asia index 10a7ef4..ff65a04 100644 --- a/asia +++ b/asia @@ -1502,6 +1502,11 @@ Zone Asia/Jayapura 9:22:48 - LMT 1932 Nov # still during the shah's government), or how things continued in 1979 # onwards (which was during the Islamic Republic). +# From Francis Santoni (2022-06-01): +# for Iran and 1977 the effective change is only 20 october +# (UIT No. 143 17.XI.1977) and not 23 september (UIT No. 141 13.IX.1977). +# UIT is the Operational Bulletin of International Telecommunication Union. + # From Roozbeh Pournader (2003-03-15): # This is an English translation of what I just found (originally in Persian). # The Gregorian dates in brackets are mine: @@ -1536,9 +1541,12 @@ Zone Asia/Jayapura 9:22:48 - LMT 1932 Nov # leap year calculation involved. There has never been any serious # plan to change that law.... # -# From Paul Eggert (2022-06-01): +# From Paul Eggert (2022-06-30): # Go with Pournader for 1935 through spring 1979, and for timestamps # after August 1991; go with with Shanks & Pottenger for other timestamps. +# Go with Santoni's citation of the UIT for fall 1977, as 20 October 1977 +# is 28 Mehr 1356, consistent with the "Mehr" in Pournader's source. +# Assume that the UIT's "1930" is UTC, i.e., 24:00 local time. # # From Oscar van Vlijmen (2005-03-30), writing about future # discrepancies between cal-persia and the Iranian calendar: @@ -1583,7 +1591,7 @@ Zone Asia/Jayapura 9:22:48 - LMT 1932 Nov Rule Iran 1910 only - Jan 1 00:00 0 - # Rule Iran 1977 only - Mar 21 23:00 1:00 - -Rule Iran 1977 only - Sep 23 24:00 0 - +Rule Iran 1977 only - Oct 20 24:00 0 - Rule Iran 1978 only - Mar 24 24:00 1:00 - Rule Iran 1978 only - Aug 5 01:00 0 - Rule Iran 1979 only - May 26 24:00 1:00 - @@ -1625,7 +1633,7 @@ Rule Iran 2021 2022 - Sep 21 24:00 0 - # Zone NAME STDOFF RULES FORMAT [UNTIL] Zone Asia/Tehran 3:25:44 - LMT 1916 3:25:44 - TMT 1935 Jun 13 # Tehran Mean Time - 3:30 Iran +0330/+0430 1977 Sep 23 24:00 + 3:30 Iran +0330/+0430 1977 Oct 20 24:00 4:00 Iran +04/+05 1979 3:30 Iran +0330/+0430 -- 2.36.1