From a9bb98690d38bc255e28c25e14f422e4d185fa25 Mon Sep 17 00:00:00 2001 From: Tim Parenti Date: Wed, 6 Jul 2022 21:59:03 -0400 Subject: Chile's 1946/7 DST started early * southamerica (America/Santiago, America/Punta_Arenas): A "transitional article" in Law 8,522 brought DST into effect a few days earlier than the otherwise-prescribed 1 September start date. Presume this change took place on 1946-08-28 at 24:00. (Thanks to Michael Deckers.) https://mm.icann.org/pipermail/tz/2022-March/031303.html * NEWS: Update mention. --- NEWS | 7 ++++--- southamerica | 28 ++++++++++++---------------- 2 files changed, 16 insertions(+), 19 deletions(-) diff --git a/NEWS b/NEWS index 8554b2e..60deee4 100644 --- a/NEWS +++ b/NEWS @@ -23,9 +23,10 @@ Unreleased, experimental changes transition was on 05-27, not 03-21. (Thanks to Roozbeh Pournader and Francis Santoni.) - Chile's time from 1946-09-01 through 1947-03-31 was DST, not - standard time. (Thanks to Michael Deckers.) On 1946-09-01 - Santiago moved its clock back at 01:00, not at 00:00. + Chile's observance of -04 from 1946-08-29 through 1947-03-31 was + considered DST, not standard time. Santiago and environs had moved + their clocks back to rejoin the rest of mainland Chile; put this + change at the end of 1946-08-28. (Thanks to Michael Deckers.) Changes to zone name diff --git a/southamerica b/southamerica index 483c8af..7b0b084 100644 --- a/southamerica +++ b/southamerica @@ -1141,7 +1141,7 @@ Zone America/Rio_Branco -4:31:12 - LMT 1914 # this is known to work for DST transitions starting in 2008 and # may well be true for earlier transitions. -# From Tim Parenti (2022-03-15): +# From Tim Parenti (2022-07-06): # For a brief period of roughly six weeks in 1946, DST was only observed on an # emergency basis in specific regions of central Chile; namely, "the national # territory between the provinces of Coquimbo and Concepción, inclusive". @@ -1159,7 +1159,14 @@ Zone America/Rio_Branco -4:31:12 - LMT 1914 # Law Number 8,522, promulgated 1946-08-27, reunified Chilean clocks at their # new "Summer Time" of -04, reckoned as that of "the meridian of the # Astronomical Observatory of Lo Espejo, advanced by 42 minutes and 45 -# seconds". +# seconds". Although this law specified the new Summer Time to start on 1 +# September each year, a special "transitional article" started it a few days +# early, as soon as the law took effect. As the law was to take force "from +# the date of its publication in the 'Diario Oficial', which happened the +# following day, presume the change took place in Santiago and its environs +# from 24:00 -03 to 23:00 -04 on Wednesday 1946-08-28. Although this was a +# no-op for wall clocks in the north and south of the country, put their formal +# start to DST an hour later when they reached 24:00 -04. # https://www.diariooficial.interior.gob.cl/versiones-anteriores/do-h/19460828/#page/1 # After a brief "Winter Time" stint at -05 beginning 1947-04-01, Law Number # 8,777, promulgated 1947-05-17, established year-round -04 "from 23:00 on the @@ -1167,17 +1174,6 @@ Zone America/Rio_Branco -4:31:12 - LMT 1914 # on Monday 1947-05-19 and so took effect from Wednesday 1947-05-21 23:00. # https://www.diariooficial.interior.gob.cl/versiones-anteriores/do-h/19470519/#page/1 -# From Paul Eggert (2022-07-01): -# Law 8,522 says it took effect on publication (1946-08-28) and set -# the time zone to -04 with DST beginning 1946-08-31 at 23:00. -# Strictly speaking, this meant Chilean citizens would have needed -# to change their clocks twice, once on 08-28 and once late on 08-31. -# This sounds unlikely, so for now guess there was just one change late -# on 08-31, with clocks reading 1946-09-01 00:00 after the change. -# In other words, guess a transition at 09-01 00:00 in Punta Arenas -# (where only the tm_isdst flag changes) and at 09-01 01:00 in -# Santiago (which changes from -03 to -04, both with DST). - # From Eduardo Krell (1995-10-19): # The law says to switch to DST at midnight [24:00] on the second SATURDAY # of October.... The law is the same for March and October. @@ -1345,8 +1341,8 @@ Zone America/Santiago -4:42:45 - LMT 1890 -5:00 Chile -05/-04 1932 Sep 1 -4:00 - -04 1942 Jun 1 -5:00 - -05 1942 Aug 1 - -4:00 - -04 1946 Jul 15 - -4:00 1:00 -03 1946 Sep 1 1:00 + -4:00 - -04 1946 Jul 14 24:00 + -4:00 1:00 -03 1946 Aug 28 24:00 # central CL -5:00 1:00 -04 1947 Mar 31 24:00 -5:00 - -05 1947 May 21 23:00 -4:00 Chile -04/-03 @@ -1359,7 +1355,7 @@ Zone America/Punta_Arenas -4:43:40 - LMT 1890 -5:00 Chile -05/-04 1932 Sep 1 -4:00 - -04 1942 Jun 1 -5:00 - -05 1942 Aug 1 - -4:00 - -04 1946 Sep 1 + -4:00 - -04 1946 Aug 28 24:00 -5:00 1:00 -04 1947 Mar 31 24:00 -5:00 - -05 1947 May 21 23:00 -4:00 Chile -04/-03 2016 Dec 4 -- 2.15.1