From bbd0ea690201acab766db57142f9aa0abba30613 Mon Sep 17 00:00:00 2001 From: Paul Eggert Date: Sun, 21 Jan 2018 18:50:36 -0800 Subject: [PROPOSED] Fix Japan DST transition times in 1948-1951 They were Sundays at 00:00, not Saturdays or Sundays at 02:00. (Problem reported by Takayuki Nikai.) * NEWS: Mention this. * asia (Japan): Implement this. --- NEWS | 5 +++++ asia | 20 ++++++++++---------- 2 files changed, 15 insertions(+), 10 deletions(-) diff --git a/NEWS b/NEWS index f1cf778..a06bb36 100644 --- a/NEWS +++ b/NEWS @@ -13,6 +13,11 @@ Unreleased, experimental changes developed for ICU and OpenJDK. (Problems reported by Deborah Goldsmith and Stephen Colebourne.) + Changes to past time stamps + + Japanese DST transitions (1948-1951) were Sundays at 00:00, not + Saturdays or Sundays at 02:00. (Thanks to Takayuki Nikai.) + Changes to build procedure The build procedure now works around mawk 1.3.3's lack of support diff --git a/asia b/asia index 0c02631..3f6e95c 100644 --- a/asia +++ b/asia @@ -1464,17 +1464,17 @@ Zone Asia/Jerusalem 2:20:54 - LMT 1880 # of the Japanese wanted to scrap daylight-saving time, as opposed to 30% who # wanted to keep it.) -# From Paul Eggert (2006-03-22): -# Shanks & Pottenger write that DST in Japan during those years was as follows: +# From Takayuki Nikai (2018-01-19): +# The source of information is Japanese law. +# http://www.shugiin.go.jp/internet/itdb_housei.nsf/html/houritsu/00219480428029.htm +# http://www.shugiin.go.jp/internet/itdb_housei.nsf/html/houritsu/00719500331039.htm +# ... In summary, it is written as follows. From 24:00 on the first Saturday +# in May, until 0:00 on the day after the second Saturday in September. # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S -Rule Japan 1948 only - May Sun>=1 2:00 1:00 D -Rule Japan 1948 1951 - Sep Sat>=8 2:00 0 S -Rule Japan 1949 only - Apr Sun>=1 2:00 1:00 D -Rule Japan 1950 1951 - May Sun>=1 2:00 1:00 D -# but the only locations using it (for birth certificates, presumably, since -# their audience is astrologers) were US military bases. For now, assume -# that for most purposes daylight-saving time was observed; otherwise, what -# would have been the point of the 1951 poll? +Rule Japan 1948 only - May Sat>=1 24:00 1:00 D +Rule Japan 1948 1951 - Sep Sun>=9 0:00 0 S +Rule Japan 1949 only - Apr Sat>=1 24:00 1:00 D +Rule Japan 1950 1951 - May Sat>=1 24:00 1:00 D # From Hideyuki Suzuki (1998-11-09): # 'Tokyo' usually stands for the former location of Tokyo Astronomical -- 2.7.4