From 56c15806e2e23b0b66c144e17c636c5bcb2e455b Mon Sep 17 00:00:00 2001 From: Paul Eggert Date: Tue, 9 Jan 2024 22:49:20 -0800 Subject: [PROPOSED] Toronto 1947/1949 switched at 02:00 not 00:00 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit * NEWS: Mention this. * northamerica (Toronto): Simplify 1945/1973 rules to reflect the fact that Toronto’s transitions in 1947/1949 were at 02:00 not 00:00 (thanks to Chris Walton). --- NEWS | 5 +++++ northamerica | 19 ++++++++++++------- 2 files changed, 17 insertions(+), 7 deletions(-) diff --git a/NEWS b/NEWS index 013e2f40..6dba3dfb 100644 --- a/NEWS +++ b/NEWS @@ -6,6 +6,11 @@ Unreleased, experimental changes zic no longer pretends to support indefinite-past DST. localtime no longer mishandles Ciudad Juárez in 2422. + Changes to past timestamps + + From 1947 through 1949, Toronto's transitions occurred at 02:00 + not 00:00. (Thanks to Chris Walton.) + Changes to code The FROM and TO columns of Rule lines can no longer be "minimum" diff --git a/northamerica b/northamerica index 8ac106ab..44fd50bd 100644 --- a/northamerica +++ b/northamerica @@ -1642,6 +1642,15 @@ Zone America/Moncton -4:19:08 - LMT 1883 Dec 9 # Some cities in the United States have pushed the deadline back # three weeks and will change over from daylight saving in October. +# From Chris Walton (2024-01-09): +# The [Toronto] changes in 1947, 1948, and 1949 took place at 2:00 a.m. local +# time instead of midnight.... Toronto Daily Star - ... +# April 2, 1947 - Page 39 ... April 7, 1948 - Page 13 ... +# April 2, 1949 - Page 1 ... April 7, 1949 - Page 24 ... +# November 25, 1949 - Page 52 ... April 21, 1950 - Page 14 ... +# September 19, 1950 - Page 46 ... September 20, 1950 - Page 3 ... +# November 24, 1950 - Page 21 + # From Arthur David Olson (2010-07-17): # # "Standard Time and Time Zones in Canada" appeared in @@ -1703,13 +1712,9 @@ Rule Toronto 1927 1937 - Sep Sun>=25 2:00 0 S Rule Toronto 1928 1937 - Apr Sun>=25 2:00 1:00 D Rule Toronto 1938 1940 - Apr lastSun 2:00 1:00 D Rule Toronto 1938 1939 - Sep lastSun 2:00 0 S -Rule Toronto 1945 1946 - Sep lastSun 2:00 0 S -Rule Toronto 1946 only - Apr lastSun 2:00 1:00 D -Rule Toronto 1947 1949 - Apr lastSun 0:00 1:00 D -Rule Toronto 1947 1948 - Sep lastSun 0:00 0 S -Rule Toronto 1949 only - Nov lastSun 0:00 0 S -Rule Toronto 1950 1973 - Apr lastSun 2:00 1:00 D -Rule Toronto 1950 only - Nov lastSun 2:00 0 S +Rule Toronto 1945 1948 - Sep lastSun 2:00 0 S +Rule Toronto 1946 1973 - Apr lastSun 2:00 1:00 D +Rule Toronto 1949 1950 - Nov lastSun 2:00 0 S Rule Toronto 1951 1956 - Sep lastSun 2:00 0 S # Shanks & Pottenger say Toronto ended DST a week early in 1971, # namely on 1971-10-24, but Mark Brader wrote (2003-05-31) that this -- 2.40.1