From fbf2da62bb3c44c02a4cdda386486e9e8ac123b3 Mon Sep 17 00:00:00 2001 From: Tim Parenti Date: Thu, 15 Feb 2018 20:51:24 -0500 Subject: Update history for Uruguay to match legal documents. * southamerica (Uruguay, America/Montevideo): Update historical data to match official legal documents referenced by the Oceanography, Hydrography, and Meteorology Service of the Uruguayan Navy. * zone.tab, zone1970.tab (America/Montevideo): Update location to match coordinates for the Observatory of the National Meteorological Institute in Montevideo, per the Proceedings of the Second Pan-American Scientific Congress, 1915-1916. * NEWS: Mention this. --- NEWS | 27 ++++++- southamerica | 225 ++++++++++++++++++++++++++++++++++++++++++++++------------- zone.tab | 2 +- zone1970.tab | 2 +- 4 files changed, 206 insertions(+), 50 deletions(-) diff --git a/NEWS b/NEWS index 8e0b861..4b6ddb8 100644 --- a/NEWS +++ b/NEWS @@ -8,12 +8,33 @@ Unreleased, experimental changes Changes to past time stamps + Historical transitions for Uruguay, represented by + America/Montevideo, have been updated per official legal documents, + replacing previous data mainly originating from the inventions of + Shanks & Pottenger. This has resulted in adjustments ranging from + 30 to 90 minutes in either direction over at least two dozen + distinct periods ranging from one day to several years in length. + A mere handful of pre-1991 transitions are unaffected; data since + then has come from more reliable contemporaneous reporting. These + changes affect various timestamps in 1920-1923, 1926, 1936, 1939, + 1942-1943, 1959, 1966-1970, 1972, 1974-1980, and 1988-1990. + Additionally, Uruguay's pre-standard-time UT offset has been + adjusted westward by 7 seconds, from UT-03:44:44 to UT-03:44:51, to + match the location of the Observatory of the National Meteorological + Institute in Montevideo. + (Thanks to Jeremie Bonjour and Tim Parenti.) + Enderbury and Kiritimati skipped New Year's Eve 1994, not - New Year's day 1995. (Thanks to Kerry Shetline.) + New Year's Day 1995. (Thanks to Kerry Shetline.) Fix an off-by-1 error for pre-1913 timestamps in Jamaica and in Turks & Caicos. + Changes to past time zone abbreviations + + MMT took effect in Uruguay from 1908-06-10, not 1898-06-28. There + is no clock change associated with the transition. + Changes to build procedure The new DATAFORM macro in the Makefile lets the installer choose @@ -76,6 +97,10 @@ Unreleased, experimental changes need not occur in summer, and need not have a positive offset from standard time. + Commentary about historical transitions in Uruguay has been expanded + with links to many relevant legal documents. + (Thanks to Tim Parenti.) + Release 2018c - 2018-01-22 23:00:44 -0800 diff --git a/southamerica b/southamerica index e3684aa..e980700 100644 --- a/southamerica +++ b/southamerica @@ -1678,72 +1678,201 @@ Link America/Port_of_Spain America/Tortola # Virgin Islands (UK) # Uruguay # From Paul Eggert (1993-11-18): # Uruguay wins the prize for the strangest peacetime manipulation of the rules. -# From Shanks & Pottenger: +# +# From Tim Parenti (2018-02-15), per Jeremie Bonjour (2018-01-31): +# ... At least they kept good records... +# +# http://www.armada.mil.uy/ContenidosPDFs/sohma/web/almanaque/almanaque_2018.pdf#page=36 +# Page 36 of Almanaque 2018, published by the Oceanography, Hydrography, and +# Meteorology Service of the Uruguayan Navy, seems to give many transitions +# with greater clarity than we've had before. It directly references many laws +# and decrees which are, in turn, referenced below. They can be viewed in the +# public archives of the Diario Oficial (in Spanish) at +# http://www.impo.com.uy/diariooficial/ +# +# Ley No. 3920 of 1908-06-10 placed the determination of legal time under the +# auspices of the National Institute for the Prediction of Time. It is unclear +# exactly what offset was used during this period, though Ley No. 7200 of +# 1920-04-23 used the Observatory of the National Meteorological Institute in +# Montevideo (S 34°54′33″, W 056°12′45″) as its reference meridian, retarding +# legal time by 15 minutes 9 seconds from 1920-04-30 24:00, resulting in UT-04. +# Assume the corresponding LMT of UT-03:44:51 (given on page 725 of the +# Proceedings of the Second Pan-American Scientific Congress, 1915-1916) was in +# use, and merely became official from 1908-06-10. +# https://www.impo.com.uy/diariooficial/1908/06/18/12 +# https://www.impo.com.uy/diariooficial/1920/04/27/9 +# +# Ley No. 7594 of 1923-06-28 specified legal time as Observatory time advanced +# by 44 minutes 51 seconds (UT-03) "from 30 September to 31 March", and by 14 +# minutes 51 seconds (UT-03:30) "the rest of the year"; a message from the +# National Council of Administration the same day, published directly below the +# law in the Diario Oficial, specified the first transition to be 1923-09-30 +# 24:00. This effectively established standard time at UT-03:30 with 30 +# minutes DST. Assume transitions at 24:00 on the specified days until Ley No. +# 7919 of 1926-03-05 ended this arrangement, repealing all "laws and other +# provisions which oppose" it, resulting immediately in year-round UT-03:30. +# (Since we don't know the time at which the change became law, assume clocks +# were changed at 24:00 that evening. Almanaque 2018 is a bit hand-wavey here, +# anyway.) +# https://www.impo.com.uy/diariooficial/1923/07/02/2 +# https://www.impo.com.uy/diariooficial/1926/03/10/2 +# # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S -# Whitman gives 1923 Oct 1; go with Shanks & Pottenger. -Rule Uruguay 1923 only - Oct 2 0:00 0:30 - -Rule Uruguay 1924 1926 - Apr 1 0:00 0 - -Rule Uruguay 1924 1925 - Oct 1 0:00 0:30 - -Rule Uruguay 1933 1935 - Oct lastSun 0:00 0:30 - -# Shanks & Pottenger give 1935 Apr 1 0:00 & 1936 Mar 30 0:00; go with Whitman. -Rule Uruguay 1934 1936 - Mar Sat>=25 23:30s 0 - -Rule Uruguay 1936 only - Nov 1 0:00 0:30 - -Rule Uruguay 1937 1941 - Mar lastSun 0:00 0 - -# Whitman gives 1937 Oct 3; go with Shanks & Pottenger. -Rule Uruguay 1937 1940 - Oct lastSun 0:00 0:30 - -# Whitman gives 1941 Oct 24 - 1942 Mar 27, 1942 Dec 14 - 1943 Apr 13, -# and 1943 Apr 13 "to present time"; go with Shanks & Pottenger. +Rule Uruguay 1923 1925 - Oct 1 0:00 0:30 - +Rule Uruguay 1924 1925 - Apr 1 0:00 0 - +Rule Uruguay 1926 only - Mar 5 24:00 0 - +# From Tim Parenti (2018-02-15): +# http://www.impo.com.uy/diariooficial/1933/10/27/6 +# +# It appears Ley No. 9122 of 1933 was never published as such in the Diario +# Oficial, but instead appeared as Document 26 in the Diario on Friday +# 1933-10-27 as a decree made Monday 1933-10-23 and filed under the Ministry of +# National Defense. It reinstituted a DST of 30 minutes (to UT-03) "from the +# last Sunday of October...until the last Saturday of March." In accordance +# with this provision, the first transition was explicitly specified in Article +# 2 of the decree as Saturday 1933-10-28 at 24:00; that is, Sunday 1933-10-29 +# at 00:00. Assume transitions at 00:00 Sunday throughout. +# +# Departing from the matter-of-fact nature of previous timekeeping laws, the +# 1933 decree "consider[s] the advantages of...the advance of legal time": +# +# "Whereas: The measure adopted by almost all nations at the time of the last +# World War still persists in North America and Europe, precisely because of +# the economic, hygienic, and social advantages derived from such an +# emergency measure... +# +# Whereas: The advance of the legal time during the summer seasons, by +# displacing social activity near sunrise, favors the citizen populations +# and especially the society that creates and works..." +# +# It further specified that "necessary measures" be taken to ensure that +# "public spectacles finish, in general, before [01:00]." +Rule Uruguay 1933 1938 - Oct lastSun 0:00 0:30 - +Rule Uruguay 1934 1941 - Mar lastSat 24:00 0 - +# From Tim Parenti (2018-02-15): +# Most of the Rules below, and their contemporaneous Zone lines, have been +# updated simply to match the Almanaque 2018. Although the document does not +# list exact transition times, midnight transitions were already present in our +# data here for all transitions through 2004-09, and this is both consistent +# with prior transitions and verified in several decrees marked below between +# 1939-09 and 2004-09, wherein the relevant text was typically of the form: +# +# "From 0 hours on [date], the legal time of the entire Republic will be... +# +# In accordance with [the preceding], on [previous date] at 24 hours, all +# clocks throughout the Republic will be [advanced/retarded] by..." +# +# It is possible that there is greater specificity to be found for the Rules +# below, but it is buried in no fewer than 40 different decrees individually +# referenced by the Almanaque for the period from 1939-09 to 2014-09. +# Four-fifths of these were promulgated less than two weeks before taking +# effect; more than half within a week and none more than 5 weeks. Only the +# handful with comments below have been checked with any thoroughness. +Rule Uruguay 1939 only - Oct 1 0:00 0:30 - +Rule Uruguay 1940 only - Oct 27 0:00 0:30 - +# From Tim Parenti (2018-02-15): +# Decreto 1145 of the Ministry of National Defense, dated 1941-07-26, specified +# UT-03 from Friday 1941-08-01 00:00, citing an "urgent...need to save fuel". +# http://www.impo.com.uy/diariooficial/1941/08/04/1 Rule Uruguay 1941 only - Aug 1 0:00 0:30 - -Rule Uruguay 1942 only - Jan 1 0:00 0 - -Rule Uruguay 1942 only - Dec 14 0:00 1:00 - +# From Tim Parenti (2018-02-15): +# Decreto 1866 of the Ministry of National Defense, dated 1942-12-09, specified +# further advancement (to UT-02:30) from Sunday 1942-12-13 24:00. Since clocks +# never went back to UT-03:30 thereafter, this is modeled as advancing standard +# time by 30 minutes to UT-03, while retaining 30 minutes of DST. +# http://www.impo.com.uy/diariooficial/1942/12/16/3 +Rule Uruguay 1942 only - Dec 14 0:00 0:30 - Rule Uruguay 1943 only - Mar 14 0:00 0 - -Rule Uruguay 1959 only - May 24 0:00 1:00 - +Rule Uruguay 1959 only - May 24 0:00 0:30 - Rule Uruguay 1959 only - Nov 15 0:00 0 - Rule Uruguay 1960 only - Jan 17 0:00 1:00 - Rule Uruguay 1960 only - Mar 6 0:00 0 - -Rule Uruguay 1965 1967 - Apr Sun>=1 0:00 1:00 - +Rule Uruguay 1965 only - Apr 4 0:00 1:00 - Rule Uruguay 1965 only - Sep 26 0:00 0 - -Rule Uruguay 1966 1967 - Oct 31 0:00 0 - -Rule Uruguay 1968 1970 - May 27 0:00 0:30 - -Rule Uruguay 1968 1970 - Dec 2 0:00 0 - -Rule Uruguay 1972 only - Apr 24 0:00 1:00 - -Rule Uruguay 1972 only - Aug 15 0:00 0 - +# From Tim Parenti (2018-02-15): +# Decreto 321/968 of 1968-05-25, citing emergency drought measures decreed the +# day before, brought clocks forward 30 minutes from Monday 1968-05-27 00:00. +# http://www.impo.com.uy/diariooficial/1968/05/30/5 +Rule Uruguay 1968 only - May 27 0:00 0:30 - +Rule Uruguay 1968 only - Dec 1 0:00 0 - +# From Tim Parenti (2018-02-15): +# Decreto 188/970 of 1970-04-23 instituted restrictions on electricity +# consumption "as a consequence of the current rainfall regime in the country". +# Articles 13 and 14 advanced clocks by an hour from Saturday 1970-04-25 00:00. +# http://www.impo.com.uy/diariooficial/1970/04/29/4 +Rule Uruguay 1970 only - Apr 25 0:00 1:00 - +Rule Uruguay 1970 only - Jun 14 0:00 0 - +Rule Uruguay 1972 only - Apr 23 0:00 1:00 - +Rule Uruguay 1972 only - Jul 16 0:00 0 - +# From Tim Parenti (2018-02-15): +# Decreto 29/974 of 1974-01-11, citing "the international rise in the price of +# oil", advanced clocks by 90 minutes (to UT-01:30). Decreto 163/974 of +# 1974-03-04 returned 60 of those minutes (to UT-02:30), and the remaining 30 +# minutes followed in Decreto 679/974 of 1974-08-29. +# http://www.impo.com.uy/diariooficial/1974/01/22/11 +# http://www.impo.com.uy/diariooficial/1974/03/14/3 +# http://www.impo.com.uy/diariooficial/1974/09/04/6 +Rule Uruguay 1974 only - Jan 13 0:00 1:30 - Rule Uruguay 1974 only - Mar 10 0:00 0:30 - +Rule Uruguay 1974 only - Sep 1 0:00 0 - Rule Uruguay 1974 only - Dec 22 0:00 1:00 - -Rule Uruguay 1976 only - Oct 1 0:00 0 - +Rule Uruguay 1975 only - Mar 30 0:00 0 - +Rule Uruguay 1976 only - Dec 19 0:00 1:00 - +Rule Uruguay 1977 only - Mar 6 0:00 0 - Rule Uruguay 1977 only - Dec 4 0:00 1:00 - -Rule Uruguay 1978 only - Apr 1 0:00 0 - -Rule Uruguay 1979 only - Oct 1 0:00 1:00 - -Rule Uruguay 1980 only - May 1 0:00 0 - +Rule Uruguay 1978 1979 - Mar Sun>=1 0:00 0 - +Rule Uruguay 1978 only - Dec 17 0:00 1:00 - +Rule Uruguay 1979 only - Apr 29 0:00 1:00 - +Rule Uruguay 1980 only - Mar 16 0:00 0 - +# From Tim Parenti (2018-02-15): +# Decreto 725/987 of 1987-12-04 cited "better use of national tourist +# attractions" to advance clocks one hour from Monday 1987-12-14 00:00. +# http://www.impo.com.uy/diariooficial/1988/01/25/1 Rule Uruguay 1987 only - Dec 14 0:00 1:00 - -Rule Uruguay 1988 only - Mar 14 0:00 0 - +Rule Uruguay 1988 only - Feb 28 0:00 0 - Rule Uruguay 1988 only - Dec 11 0:00 1:00 - -Rule Uruguay 1989 only - Mar 12 0:00 0 - +Rule Uruguay 1989 only - Mar 5 0:00 0 - Rule Uruguay 1989 only - Oct 29 0:00 1:00 - -# Shanks & Pottenger say no DST was observed in 1990/1 and 1991/2, -# and that 1992/3's DST was from 10-25 to 03-01. Go with IATA. -Rule Uruguay 1990 1992 - Mar Sun>=1 0:00 0 - +Rule Uruguay 1990 only - Feb 25 0:00 0 - +# From Tim Parenti (2018-02-15), per Paul Eggert (1999-11-04): +# IATA agrees as below for 1990-10 through 1993-02. Per Almanaque 2018, the +# 1992/1993 season appears to be the first in over half a century where DST +# both began and ended pursuant to the same decree. Rule Uruguay 1990 1991 - Oct Sun>=21 0:00 1:00 - +Rule Uruguay 1991 1992 - Mar Sun>=1 0:00 0 - Rule Uruguay 1992 only - Oct 18 0:00 1:00 - Rule Uruguay 1993 only - Feb 28 0:00 0 - # From Eduardo Cota (2004-09-20): # The Uruguayan government has decreed a change in the local time.... -# http://www.presidencia.gub.uy/decretos/2004091502.htm +# From Tim Parenti (2018-02-15): +# Decreto 328/004 of 2004-09-15. +# http://www.impo.com.uy/diariooficial/2004/09/23/documentos.pdf#page=1 Rule Uruguay 2004 only - Sep 19 0:00 1:00 - # From Steffen Thorsen (2005-03-11): # Uruguay's DST was scheduled to end on Sunday, 2005-03-13, but in order to # save energy ... it was postponed two weeks.... -# http://www.presidencia.gub.uy/_Web/noticias/2005/03/2005031005.htm +# From Tim Parenti (2018-02-15): +# This 2005 postponement is not in Almanaque 2018. Go with the contemporaneous +# reporting, which is confirmed by Decreto 107/005 of 2005-03-10 amending +# Decreto 328/004: +# http://www.impo.com.uy/diariooficial/2005/03/15/documentos.pdf#page=1 +# The original decree specified a transition of 2005-03-12 24:00, but the new +# one specified 2005-03-27 02:00. Rule Uruguay 2005 only - Mar 27 2:00 0 - # From Eduardo Cota (2005-09-27): -# http://www.presidencia.gub.uy/_Web/decretos/2005/09/CM%20119_09%2009%202005_00001.PDF -# This means that from 2005-10-09 at 02:00 local time, until 2006-03-12 at -# 02:00 local time, official time in Uruguay will be at GMT -2. +# ...from 2005-10-09 at 02:00 local time, until 2006-03-12 at 02:00 local time, +# official time in Uruguay will be at GMT -2. +# From Tim Parenti (2018-02-15): +# Decreto 318/005 of 2005-09-19. +# http://www.impo.com.uy/diariooficial/2005/09/23/documentos.pdf#page=1 Rule Uruguay 2005 only - Oct 9 2:00 1:00 - -Rule Uruguay 2006 only - Mar 12 2:00 0 - -# From Jesper Nørgaard Welen (2006-09-06): -# http://www.presidencia.gub.uy/_web/decretos/2006/09/CM%20210_08%2006%202006_00001.PDF -# +Rule Uruguay 2006 2015 - Mar Sun>=8 2:00 0 - +# From Tim Parenti (2018-02-15), per Jesper Nørgaard Welen (2006-09-06): +# Decreto 311/006 of 2006-09-04 established regular DST from the first Sunday +# of October at 02:00 through the second Sunday of March at 02:00. Almanaque +# 2018 appears to have a few typoed dates through this period; ignore them. +# http://www.impo.com.uy/diariooficial/2006/09/08/documentos.pdf#page=1 +Rule Uruguay 2006 2014 - Oct Sun>=1 2:00 1:00 - # From Steffen Thorsen (2015-06-30): # ... it looks like they will not be using DST the coming summer: # http://www.elobservador.com.uy/gobierno-resolvio-que-no-habra-cambio-horario-verano-n656787 @@ -1753,17 +1882,19 @@ Rule Uruguay 2006 only - Mar 12 2:00 0 - # instead of out to dinner. # From Pablo Camargo (2015-07-13): # http://archivo.presidencia.gub.uy/sci/decretos/2015/06/cons_min_201.pdf -# [dated 2015-06-29; repeals Decree 311/006 dated 2006-09-04] -Rule Uruguay 2006 2014 - Oct Sun>=1 2:00 1:00 - -Rule Uruguay 2007 2015 - Mar Sun>=8 2:00 0 - +# From Tim Parenti (2018-02-15): +# Decreto 178/015 of 2015-06-29; repeals Decreto 311/006. # This Zone can be simplified once we assume zic %z. -Zone America/Montevideo -3:44:44 - LMT 1898 Jun 28 - -3:44:44 - MMT 1920 May 1 # Montevideo MT +Zone America/Montevideo -3:44:51 - LMT 1908 Jun 10 + -3:44:51 - MMT 1920 May 1 # Montevideo MT + -4:00 - -04 1923 Oct 1 -3:30 Uruguay -0330/-03 1942 Dec 14 + -3:00 Uruguay -03/-0230 1960 -3:00 Uruguay -03/-02 1968 - -3:00 Uruguay -03/-0230 1971 + -3:00 Uruguay -03/-0230 1970 -3:00 Uruguay -03/-02 1974 + -3:00 Uruguay -03/-0130 1974 Mar 10 -3:00 Uruguay -03/-0230 1974 Dec 22 -3:00 Uruguay -03/-02 diff --git a/zone.tab b/zone.tab index e1bfdee..f92c919 100644 --- a/zone.tab +++ b/zone.tab @@ -429,7 +429,7 @@ US +593249-1394338 America/Yakutat Alaska - Yakutat US +643004-1652423 America/Nome Alaska (west) US +515248-1763929 America/Adak Aleutian Islands US +211825-1575130 Pacific/Honolulu Hawaii -UY -3453-05611 America/Montevideo +UY -345433-0561245 America/Montevideo UZ +3940+06648 Asia/Samarkand Uzbekistan (west) UZ +4120+06918 Asia/Tashkent Uzbekistan (east) VA +415408+0122711 Europe/Vatican diff --git a/zone1970.tab b/zone1970.tab index 4ee8ce5..a3b6b04 100644 --- a/zone1970.tab +++ b/zone1970.tab @@ -371,7 +371,7 @@ US +593249-1394338 America/Yakutat Alaska - Yakutat US +643004-1652423 America/Nome Alaska (west) US +515248-1763929 America/Adak Aleutian Islands US,UM +211825-1575130 Pacific/Honolulu Hawaii -UY -3453-05611 America/Montevideo +UY -345433-0561245 America/Montevideo UZ +3940+06648 Asia/Samarkand Uzbekistan (west) UZ +4120+06918 Asia/Tashkent Uzbekistan (east) VE +1030-06656 America/Caracas -- 2.15.1