98 lines
4.1 KiB
Diff
98 lines
4.1 KiB
Diff
|
From b980f1cac5121f702eb6b0cc679d960e8a275a3f Mon Sep 17 00:00:00 2001
|
||
|
|
From: Tim Parenti <tim@timtimeonline.com>
|
||
|
|
Date: Sat, 5 Dec 2020 13:39:09 -0500
|
||
|
|
Subject: [PATCH] Model Turks & Caicos time 2015-2018 as AST
|
||
|
|
|
||
|
|
(Thanks to P Chan.)
|
||
|
|
* NEWS: Mention this.
|
||
|
|
* northamerica (America/Grand_Turk): Model the year-round observance of
|
||
|
|
-04 in the Turks & Caicos Islands as AST from 2015-03 through 2018-03,
|
||
|
|
to better match the legislation. This only affects the abbreviation and
|
||
|
|
DST flag 2015-03-08/11-01. Expand commentary on slight discrepancy with
|
||
|
|
the 2018-03-11 return to Eastern Time with US rules.
|
||
|
|
---
|
||
|
|
NEWS | 7 +++++++
|
||
|
|
northamerica | 31 +++++++++++++++++++++++++++----
|
||
|
|
2 files changed, 34 insertions(+), 4 deletions(-)
|
||
|
|
|
||
|
|
diff --git a/NEWS b/NEWS
|
||
|
|
index 2182c70..0937d8a 100644
|
||
|
|
--- a/NEWS
|
||
|
|
+++ b/NEWS
|
||
|
|
@@ -27,6 +27,13 @@ Unreleased, experimental changes
|
||
|
|
Australia/Currie has been moved to the 'backward' file and its
|
||
|
|
corrected data moved to the 'backzone' file.
|
||
|
|
|
||
|
|
+ Changes to past time zone abbreviations and DST flags
|
||
|
|
+
|
||
|
|
+ To better match legislation in Turks and Caicos, the 2015 shift to
|
||
|
|
+ year-round observance of -04 is now modeled as AST throughout before
|
||
|
|
+ returning to Eastern Time with US DST in 2018, rather than as
|
||
|
|
+ maintaining EDT until 2015-11-01. (Thanks to P Chan.)
|
||
|
|
+
|
||
|
|
|
||
|
|
Release 2020d - 2020-10-21 11:24:13 -0700
|
||
|
|
|
||
|
|
diff --git a/northamerica b/northamerica
|
||
|
|
index d8bb8f8..ddc5759 100644
|
||
|
|
--- a/northamerica
|
||
|
|
+++ b/northamerica
|
||
|
|
@@ -3727,7 +3727,7 @@ Zone America/Miquelon -3:44:40 - LMT 1911 May 15 # St Pierre
|
||
|
|
# "Eastern Standard Times Begins 2007
|
||
|
|
# Clocks are set back one hour at 2:00 a.m. local Daylight Saving Time"
|
||
|
|
# indicating that the normal ET rules are followed.
|
||
|
|
-#
|
||
|
|
+
|
||
|
|
# From Paul Eggert (2014-08-19):
|
||
|
|
# The 2014-08-13 Cabinet meeting decided to stay on UT -04 year-round. See:
|
||
|
|
# http://tcweeklynews.com/daylight-savings-time-to-be-maintained-p5353-127.htm
|
||
|
|
@@ -3742,19 +3742,42 @@ Zone America/Miquelon -3:44:40 - LMT 1911 May 15 # St Pierre
|
||
|
|
# during the summer months and Standard Time, also known as Local
|
||
|
|
# Time, during the winter months with effect from April 2018 ...
|
||
|
|
# https://www.gov.uk/government/news/turks-and-caicos-post-cabinet-meeting-statement--3
|
||
|
|
-#
|
||
|
|
# From Paul Eggert (2017-08-26):
|
||
|
|
# The date of effect of the spring 2018 change appears to be March 11,
|
||
|
|
# which makes more sense. See: Hamilton D. Time change back
|
||
|
|
# by March 2018 for TCI. Magnetic Media. 2017-08-25.
|
||
|
|
# http://magneticmediatv.com/2017/08/time-change-back-by-march-2018-for-tci/
|
||
|
|
#
|
||
|
|
+# From P Chan (2020-11-27):
|
||
|
|
+# Standard Time Declaration Order 2015 (L.N. 15/2015)
|
||
|
|
+# http://online.fliphtml5.com/fizd/czin/#p=2
|
||
|
|
+#
|
||
|
|
+# Standard Time Declaration Order 2017 (L.N. 31/2017)
|
||
|
|
+# http://online.fliphtml5.com/fizd/dmcu/#p=2
|
||
|
|
+#
|
||
|
|
+# From Tim Parenti (2020-12-05):
|
||
|
|
+# Although L.N. 31/2017 reads that it "shall come into operation at 2:00 a.m.
|
||
|
|
+# on 11th March 2018", a precise interpretation here poses some problems. The
|
||
|
|
+# order states that "the standard time to be observed throughout the Turks and
|
||
|
|
+# Caicos Islands shall be the same time zone as the Eastern United States of
|
||
|
|
+# America" and further clarifies "[f]or the avoidance of doubt" that it
|
||
|
|
+# "applies to the Eastern Standard Time as well as any changes thereto for
|
||
|
|
+# Daylight Saving Time." However, as clocks in Turks and Caicos approached
|
||
|
|
+# 02:00 -04, and thus the declared implementation time, it was still 01:00 EST
|
||
|
|
+# (-05), as DST in the Eastern US would not start until an hour later.
|
||
|
|
+#
|
||
|
|
+# Since it is unlikely that those on the islands switched their clocks twice in
|
||
|
|
+# the span of an hour, we assume instead that the adoption of EDT actually took
|
||
|
|
+# effect once clocks in the Eastern US had sprung forward, from 03:00 -04.
|
||
|
|
+# This discrepancy only affects the time zone abbreviation and DST flag for the
|
||
|
|
+# intervening hour, not wall clock times, as -04 was maintained throughout.
|
||
|
|
+
|
||
|
|
# Zone NAME STDOFF RULES FORMAT [UNTIL]
|
||
|
|
Zone America/Grand_Turk -4:44:32 - LMT 1890
|
||
|
|
-5:07:10 - KMT 1912 Feb # Kingston Mean Time
|
||
|
|
-5:00 - EST 1979
|
||
|
|
- -5:00 US E%sT 2015 Nov Sun>=1 2:00
|
||
|
|
- -4:00 - AST 2018 Mar 11 3:00
|
||
|
|
+ -5:00 US E%sT 2015 Mar 8 2:00
|
||
|
|
+ -4:00 - AST 2018 Mar 11 3:00
|
||
|
|
-5:00 US E%sT
|
||
|
|
|
||
|
|
# British Virgin Is
|
||
|
|
--
|
||
|
|
1.8.3.1
|
||
|
|
|