From 937286d45c0f89132f0bf2d92fc27c36ae909cd6 Mon Sep 17 00:00:00 2001 From: Paul Eggert Date: Sun, 6 May 2018 23:43:59 -0700 Subject: [PROPOSED] Correct China DST transitions in 1986/91 (Thanks to P Chan.) * NEWS: Mention this. * asia (PRC): Change AT column from 00:00 to 02:00. Change 1987/91 rule from Apr Sun>=10 to Apr Sun>=11, so that the 1988 transition is on April 17, not April 10. --- NEWS | 4 ++++ asia | 34 ++++++++++++++++++++++++++-------- 2 files changed, 30 insertions(+), 8 deletions(-) diff --git a/NEWS b/NEWS index 79d9d80..7cbe7e5 100644 --- a/NEWS +++ b/NEWS @@ -7,6 +7,10 @@ Unreleased, experimental changes The 2018-05-05 North Korea 30-minute time zone change took place at 23:30 the previous day, not at 00:00 that day. + China's 1988 spring-forward transition was on May 17, not May 10. + Its DST transitions in 1986/91 were at 02:00, not 00:00. (Thanks + to P Chan.) + Changes to build procedure New 'make' target 'rearguard_tarballs' to build the rearguard diff --git a/asia b/asia index 2e829b8..1821be6 100644 --- a/asia +++ b/asia @@ -307,18 +307,36 @@ Zone Asia/Yangon 6:24:47 - LMT 1880 # or Rangoon # time - sort of", Los Angeles Times, 1986-05-05 ... [says] that China began # observing daylight saving time in 1986. -# From Paul Eggert (2014-06-30): -# Shanks & Pottenger have China switching to a single time zone in 1980, but -# this doesn't seem to be correct. They also write that China observed summer -# DST from 1986 through 1991, which seems to match the above commentary, so -# go with them for DST rules as follows: +# From P Chan (2018-05-07): +# The start and end time of DST in China [from 1986 on] should be 2:00 +# (i.e. 2:00 to 3:00 at the start and 2:00 to 1:00 at the end).... +# Government notices about summer time: +# +# 1986-04-12 http://www.zj.gov.cn/attach/zfgb/198608.pdf p.21-22 +# (To establish summer time from 1986. On 4 May, set the clocks ahead one hour +# at 2 am. On 14 September, set the clocks backward one hour at 2 am.) +# +# 1987-02-15 http://www.gov.cn/gongbao/shuju/1987/gwyb198703.pdf p.114 +# (Summer time in 1987 to start from 12 April until 13 September) +# +# 1987-09-09 http://www.gov.cn/gongbao/shuju/1987/gwyb198721.pdf p.709 +# (From 1988, summer time to start from 2 am of the first Sunday of mid-April +# until 2 am of the first Sunday of mid-September) +# +# 1992-03-03 http://www.gov.cn/gongbao/shuju/1992/gwyb199205.pdf p.152 +# (To suspend summer time from 1992) +# +# The first page of People's Daily on 12 April 1988 stating that summer time +# to begin on 17 April. +# http://data.people.com.cn/pic/101p/1988/04/1988041201.jpg + # 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 Rule Shang 1941 only - Mar 16 0:00 1:00 D -Rule PRC 1986 only - May 4 0:00 1:00 D -Rule PRC 1986 1991 - Sep Sun>=11 0:00 0 S -Rule PRC 1987 1991 - Apr Sun>=10 0:00 1:00 D +Rule PRC 1986 only - May 4 2:00 1:00 D +Rule PRC 1986 1991 - Sep Sun>=11 2:00 0 S +Rule PRC 1987 1991 - Apr Sun>=11 2:00 1:00 D # From Anthony Fok (2001-12-20): # BTW, I did some research on-line and found some info regarding these five -- 2.7.4