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Bloomberg on possible Massachusetts time zone shift
by Arthur David Olson Aug. 30, 2016

Aug. 30, 2016

"Massachusetts Could Swap Time Zones for Later Winter Sunsets" (To Atlantic Time.) http://www.bloomberg.com/news/articles/2016-08-29/winter-s-hated-4-p-m-suns… --ado

2 1

[PROPOSED PATCH 1/4] Prefer +-NN notation for UT-offset time zones in comments.
by Paul Eggert Aug. 25, 2016

Aug. 25, 2016

This does not change any code or data; just comments. --- NEWS | 38 +++++++++++++++++++------------------- Theory | 2 +- africa | 2 +- asia | 51 +++++++++++++++++++++++++-------------------------- australasia | 26 +++++++++++++------------- backzone | 14 +++++++------- europe | 8 +------- localtime.c | 2 +- northamerica | 2 +- private.h | 1 + southamerica | 4 ++-- 11 files changed, 72 insertions(+), 78 deletions(-) diff --git a/NEWS b/NEWS index 4c18e55..b0da284 100644 --- a/NEWS +++ b/NEWS @@ -465,7 +465,7 @@ Release 2015d - 2015-04-24 08:09:46 -0700 Changes affecting past time stamps - America/Whitehorse switched from UTC-9 to UTC-8 on 1967-05-28, not + America/Whitehorse switched from -09 to -08 on 1967-05-28, not 1966-07-01. Also, Yukon's time zone history is documented better. (Thanks to Brian Inglis and Dennis Ferguson.) @@ -499,12 +499,12 @@ Release 2015c - 2015-04-11 08:55:55 -0700 The 1918 transition was September 10, not September 1. - The UTC-4 time observed from 1932 to 1942 is now considered to be + The -04 time observed from 1932 to 1942 is now considered to be standard time, not year-round DST. - Santiago observed DST (UTC-3) from 1946-07-15 through 1946-08-31, + Santiago observed DST (-03) from 1946-07-15 through 1946-08-31, then reverted to standard time, then switched its time zone to - UTC-5 on 1947-04-01. + -05 on 1947-04-01. Assume transitions before 1968 were at 00:00, since we have no data saying otherwise. @@ -633,7 +633,7 @@ Release 2014j - 2014-11-10 17:37:11 -0800 Changes affecting current and future time stamps - Turks & Caicos' switch from US eastern time to UTC-4 year-round + Turks & Caicos' switch from US eastern time to -04 year-round did not occur on 2014-11-02 at 02:00. It's currently scheduled for 2015-11-01 at 02:00. (Thanks to Chris Walton.) @@ -669,7 +669,7 @@ Release 2014i - 2014-10-21 22:04:57 -0700 years will use a similar pattern. A new Zone Pacific/Bougainville, for the part of Papua New Guinea - that plans to switch from UTC+10 to UTC+11 on 2014-12-28 at 02:00. + that plans to switch from +10 to +11 on 2014-12-28 at 02:00. (Thanks to Kiley Walbom for the heads-up.) Changes affecting time zone abbreviations @@ -679,8 +679,8 @@ Release 2014i - 2014-10-21 22:04:57 -0700 to its more-traditional value MSK on 2014-10-26 at 01:00. (Thanks to Alexander Bokovoy for the heads-up about Belarus.) - The new abbreviation IDT stands for the pre-1976 use of UT+8 in - Indochina, to distinguish it better from ICT (UT+7). + The new abbreviation IDT stands for the pre-1976 use of +08 in + Indochina, to distinguish it better from ICT (+07). Changes affecting past time stamps @@ -791,7 +791,7 @@ Release 2014g - 2014-08-28 12:31:23 -0700 Changes affecting future time stamps - Turks & Caicos is switching from US eastern time to UTC-4 year-round, + Turks & Caicos is switching from US eastern time to -04 year-round, modeled as a switch from EST/EDT to AST on 2014-11-02 at 02:00. [As noted in 2014j, this switch was later delayed.] @@ -975,7 +975,7 @@ Release 2014f - 2014-08-05 17:42:36 -0700 This change does not affect UTC offsets, only time zone abbreviations. (Thanks to Rich Tibbett and many others.) - Asia/Novokuznetsk shifts from NOVT to KRAT (remaining on UTC+7) + Asia/Novokuznetsk shifts from NOVT to KRAT (remaining on +07) effective 2014-10-26 at 02:00 local time. The time zone abbreviation for Xinjiang Time (observed in Ürümqi) @@ -1004,8 +1004,8 @@ Release 2014f - 2014-08-05 17:42:36 -0700 zones Asia/Harbin, Asia/Chongqing, and Asia/Kashgar have been removed; backwards-compatibility links still work, albeit with different behaviors for time stamps before May 1980. Asia/Urumqi's - 1980 transition to UTC+8 has been removed, so that it is now at - UTC+6 and not UTC+8. (Thanks to Luther Ma and to Alois Treindl; + 1980 transition to +08 has been removed, so that it is now at + +06 and not +08. (Thanks to Luther Ma and to Alois Treindl; Treindl sent helpful translations of two papers by Guo Qingsheng.) Some zones have been turned into links, when they differed from existing @@ -1035,7 +1035,7 @@ Release 2014f - 2014-08-05 17:42:36 -0700 Europe/Helsinki's 1942 fall-back transition was 10-04 at 01:00, not 10-03 at 00:00. (Thanks to Konstantin Hyppönen.) - Pacific/Pago_Pago has been changed from UTC-11:30 to UTC-11 for the period + Pacific/Pago_Pago has been changed from -11:30 to -11 for the period from 1911 to 1950. Pacific/Chatham has been changed to New Zealand standard time plus @@ -1363,15 +1363,15 @@ Release 2013h - 2013-10-25 15:32:32 -0700 Changes affecting current and future time stamps: - Libya has switched its time zone back to UTC+2 without DST, - instead of UTC+1 with DST. (Thanks to Even Scharning.) + Libya has switched its time zone back to +02 without DST, + instead of +01 with DST. (Thanks to Even Scharning.) Western Sahara (Africa/El_Aaiun) uses Morocco's DST rules. (Thanks to Gwillim Law.) Changes affecting future time stamps: - Acre and (we guess) western Amazonas will switch from UTC-4 to UTC-5 + Acre and (we guess) western Amazonas will switch from -04 to -05 on 2013-11-10. This affects America/Rio_Branco and America/Eirunepe. (Thanks to Steffen Thorsen.) @@ -1458,7 +1458,7 @@ Release 2013f - 2013-09-24 23:37:36 -0700 Tocantins will very likely not observe DST starting this spring. (Thanks to Steffen Thorsen.) - Jordan will likely stay at UTC+3 indefinitely, and will not fall + Jordan will likely stay at +03 indefinitely, and will not fall back this fall. Palestine will fall back at 00:00, not 01:00. (Thanks to Steffen Thorsen.) @@ -1515,7 +1515,7 @@ Release 2013e - 2013-09-19 23:50:04 -0700 Benny Lin.) This affects Asia/Dili, Asia/Jakarta, Asia/Jayapura, Asia/Makassar, and Asia/Pontianak. - Use ART (UTC-3, standard time), rather than WARST (also UTC-3, but + Use ART (-03, standard time), rather than WARST (also UTC-3, but daylight saving time) for San Luis, Argentina since 2009. Changes affecting Godthåb time stamps after 2037 if version mismatch @@ -1972,7 +1972,7 @@ Release 2012f - 2012-09-12 23:17:03 -0700 Release 2012e - 2012-08-02 20:44:55 -0700 - * australasia (Pacific/Fakaofo): Tokelau is UTC+13, not UTC+14. + * australasia (Pacific/Fakaofo): Tokelau is +13, not +14. (Thanks to Steffen Thorsen.) * Use a single version number for both code and data. diff --git a/Theory b/Theory index 60678fe..d8d3882 100644 --- a/Theory +++ b/Theory @@ -323,7 +323,7 @@ Errors in the tz database arise from many sources: * Sometimes historical timekeeping was specified more precisely than what the tz database can handle. For example, from 1909 to - 1937 Netherlands clocks were legally UT+00:19:32.13, but the tz + 1937 Netherlands clocks were legally +00:19:32.13, but the tz database cannot represent the fractional second. * Even when all the timestamp transitions recorded by the tz database diff --git a/africa b/africa index 50f29d5..43c8e23 100644 --- a/africa +++ b/africa @@ -464,7 +464,7 @@ Zone Africa/Monrovia -0:43:08 - LMT 1882 # http://www.libyaherald.com/2013/10/24/correction-no-time-change-tomorrow/ # # From Paul Eggert (2013-10-25): -# For now, assume they're reverting to the pre-2012 rules of permanent UTC+2. +# For now, assume they're reverting to the pre-2012 rules of permanent +02. # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S Rule Libya 1951 only - Oct 14 2:00 1:00 S diff --git a/asia b/asia index ee2c436..a935476 100644 --- a/asia +++ b/asia @@ -380,7 +380,7 @@ Rule PRC 1987 1991 - Apr Sun>=10 0:00 1:00 D # Lewiston (ME) Daily Sun (1939-05-29), p 17, said "Even the time is # different - the occupied districts going by Tokyo time, an hour # ahead of that prevailing in the rest of Shanghai." Guess that the -# Xujiahui Observatory was under French control and stuck with UT+8. +# Xujiahui Observatory was under French control and stuck with +08. # # In earlier versions of this file, China had many separate Zone entries, but # this was based on what were apparently incorrect data in Shanks & Pottenger. @@ -389,26 +389,26 @@ Rule PRC 1987 1991 - Apr Sun>=10 0:00 1:00 D # Proposed in 1918 and theoretically in effect until 1949 (although in practice # mainly observed in coastal areas), the five zones were: # -# Changbai Time ("Long-white Time", Long-white = Heilongjiang area) UT+8.5 +# Changbai Time ("Long-white Time", Long-white = Heilongjiang area) +08:30 # Asia/Harbin (currently a link to Asia/Shanghai) # Heilongjiang (except Mohe county), Jilin # -# Zhongyuan Time ("Central plain Time") UT+8 +# Zhongyuan Time ("Central plain Time") -08 # Asia/Shanghai # most of China # This currently represents most other zones as well, # as apparently these regions have been the same since 1970. # Milne gives 8:05:43.2 for Xujiahui Observatory time; round to nearest. -# Guo says Shanghai switched to UT+8 "from the end of the 19th century". +# Guo says Shanghai switched to +08 "from the end of the 19th century". # -# Long-shu Time (probably due to Long and Shu being two names of that area) UT+7 +# Long-shu Time (probably due to Long and Shu being two names of that area) +07 # Asia/Chongqing (currently a link to Asia/Shanghai) # Guangxi, Guizhou, Hainan, Ningxia, Sichuan, Shaanxi, and Yunnan; # most of Gansu; west Inner Mongolia; west Qinghai; and the Guangdong # counties Deqing, Enping, Kaiping, Luoding, Taishan, Xinxing, # Yangchun, Yangjiang, Yu'nan, and Yunfu. # -# Xin-zang Time ("Xinjiang-Tibet Time") UT+6 +# Xin-zang Time ("Xinjiang-Tibet Time") +06 # Asia/Urumqi # This currently represents Kunlun Time as well, # as apparently the two regions have been the same since 1970. @@ -421,7 +421,7 @@ Rule PRC 1987 1991 - Apr Sun>=10 0:00 1:00 D # Shihezi, Changji, Yanqi, Heshuo, Tuokexun, Tulufan, Shanshan, Hami, # Fukang, Kuitun, Kumukuli, Miquan, Qitai, and Turfan. # -# Kunlun Time UT+5.5 +# Kunlun Time +05:30 # Asia/Kashgar (currently a link to Asia/Urumqi) # West Tibet, including Pulan, Aheqi, Shufu, Shule; # West Xinjiang, including Aksu, Atushi, Yining, Hetian, Cele, Luopu, Nileke, @@ -493,7 +493,7 @@ Rule PRC 1987 1991 - Apr Sun>=10 0:00 1:00 D # having the same time as Beijing. # From Paul Eggert (2014-06-30): -# In the early days of the PRC, Tibet was given its own time zone (UT+6) but +# In the early days of the PRC, Tibet was given its own time zone (+06) but # this was withdrawn in 1959 and never reinstated; see Tubten Khétsun, # Memories of life in Lhasa under Chinese Rule, Columbia U Press, ISBN # 978-0231142861 (2008), translator's introduction by Matthew Akester, p x. @@ -508,12 +508,12 @@ Rule PRC 1987 1991 - Apr Sun>=10 0:00 1:00 D # Republics, the Soviet Union, the Kuomintang, and the People's Republic of # China, and tracking down all these organizations' timekeeping rules would be # quite a trick. Approximate this lost history by a transition from LMT to -# XJT at the start of 1928, the year of accession of the warlord Jin Shuren, +# +06 at the start of 1928, the year of accession of the warlord Jin Shuren, # which happens to be the date given by Shanks & Pottenger (no doubt as a -# guess) as the transition from LMT. Ignore the usage of UT+8 before -# 1986-02-01 under the theory that the transition date to UT+8 is unknown and +# guess) as the transition from LMT. Ignore the usage of +08 before +# 1986-02-01 under the theory that the transition date to +08 is unknown and # that the sort of users who prefer Asia/Urumqi now typically ignored the -# UT+8 mandate back then. +# +08 mandate back then. # Zone NAME GMTOFF RULES FORMAT [UNTIL] # Beijing time, used throughout China; represented by Shanghai. @@ -718,7 +718,7 @@ Zone Asia/Hong_Kong 7:36:42 - LMT 1904 Oct 30 # be found from historical government announcement database. # From Paul Eggert (2014-07-03): -# As per Yu-Cheng Chuang, say that Taiwan was at UT+9 from 1937-10-01 +# As per Yu-Cheng Chuang, say that Taiwan was at +09 from 1937-10-01 # until 1945-09-21 at 01:00, overriding Shanks & Pottenger. # Likewise, use Yu-Cheng Chuang's data for DST in Taiwan. @@ -917,7 +917,7 @@ Zone Asia/Kolkata 5:53:28 - LMT 1880 # Kolkata # These would be the earliest possible times for a change. # Régimes horaires pour le monde entier, by Henri Le Corre, (Éditions # Traditionnelles, 1987, Paris) says that Java and Madura switched -# from JST to UTC+07:30 on 1945-09-23, and gives 1944-09-01 for Jayapura +# from +09 to +07:30 on 1945-09-23, and gives 1944-09-01 for Jayapura # (Hollandia). For now, assume all Indonesian locations other than Jayapura # switched on 1945-09-23. # @@ -930,9 +930,9 @@ Zone Asia/Kolkata 5:53:28 - LMT 1880 # Kolkata # Indonesia, <http://time.kim.lipi.go.id/time-eng.php> (2006-09-29). # The abbreviations are: # -# WIB - UTC+7 - Waktu Indonesia Barat (Indonesia western time) -# WITA - UTC+8 - Waktu Indonesia Tengah (Indonesia central time) -# WIT - UTC+9 - Waktu Indonesia Timur (Indonesia eastern time) +# WIB - +07 - Waktu Indonesia Barat (Indonesia western time) +# WITA - +08 - Waktu Indonesia Tengah (Indonesia central time) +# WIT - +09 - Waktu Indonesia Timur (Indonesia eastern time) # # Zone NAME GMTOFF RULES FORMAT [UNTIL] # Java, Sumatra @@ -1864,25 +1864,24 @@ Rule ROK 1957 1960 - Sep Sun>=18 0:00 0 S Rule ROK 1987 1988 - May Sun>=8 2:00 1:00 D Rule ROK 1987 1988 - Oct Sun>=8 3:00 0 S -# From Paul Eggert (2014-10-30): +# From Paul Eggert (2016-08-23): # The Korean Wikipedia entry gives the following sources for UT offsets: # -# 1908: Official Journal Article No. 3994 (Edict No. 5) +# 1908: Official Journal Article No. 3994 (decree No. 5) # 1912: Governor-General of Korea Official Gazette Issue No. 367 # (Announcement No. 338) # 1954: Presidential Decree No. 876 (1954-03-17) # 1961: Law No. 676 (1961-08-07) -# 1987: Law No. 3919 (1986-12-31) # -# The Wikipedia entry also has confusing information about a change -# to UT+9 in April 1910, but then what would be the point of the later change -# to UT+9 on 1912-01-01? Omit the 1910 change for now. +# (Another source "1987: Law No. 3919 (1986-12-31)" was in the 2014-10-30 +# edition of the Korean Wikipedia entry.) # # I guessed that time zone abbreviations through 1945 followed the same # rules as discussed under Taiwan, with nominal switches from JST to KST # when the respective cities were taken over by the Allies after WWII. # -# For Pyongyang we have no information; guess no changes since World War II. +# For Pyongyang, guess no changes from World War II until 2015, as we +# have no information otherwise. # From Steffen Thorsen (2015-08-07): # According to many news sources, North Korea is going to change to @@ -2042,7 +2041,7 @@ Zone Indian/Maldives 4:54:00 - LMT 1880 # Male # Bill Bonnet (2005-05-19) reports that the US Embassy in Ulaanbaatar says # there is only one time zone and that DST is observed, citing Microsoft # Windows XP as the source. Risto Nykänen (2005-05-16) reports that -# travelmongolia.org says there are two time zones (UTC+7, UTC+8) with no DST. +# travelmongolia.org says there are two time zones (+07, +08) with no DST. # Oscar van Vlijmen (2005-05-20) reports that the Mongolian Embassy in # Washington, DC says there are two time zones, with DST observed. # He also found @@ -2678,7 +2677,7 @@ Link Asia/Qatar Asia/Bahrain # earlier date. # # Shanks & Pottenger also state that until 1968-05-01 Saudi Arabia had two -# time zones; the other zone, at UTC+4, was in the far eastern part of +# time zones; the other zone, at +04, was in the far eastern part of # the country. Ignore this, as it's before our 1970 cutoff. # # Zone NAME GMTOFF RULES FORMAT [UNTIL] diff --git a/australasia b/australasia index 0b33f67..fe77d07 100644 --- a/australasia +++ b/australasia @@ -545,7 +545,7 @@ Zone Pacific/Port_Moresby 9:48:40 - LMT 1880 # Base the Bougainville entry on the Arawa-Kieta region, which appears to have # the most people even though it was devastated in the Bougainville Civil War. # -# Although Shanks gives 1942-03-15 / 1943-11-01 for JST, these dates +# Although Shanks gives 1942-03-15 / 1943-11-01 for +09, these dates # are apparently rough guesswork from the starts of military campaigns. # The World War II entries below are instead based on Arawa-Kieta. # The Japanese occupied Kieta in July 1942, @@ -553,8 +553,8 @@ Zone Pacific/Port_Moresby 9:48:40 - LMT 1880 # http://pwencycl.kgbudge.com/B/o/Bougainville.htm # and seem to have controlled it until their 1945-08-21 surrender. # -# The Autonomous Region of Bougainville plans to switch from UTC+10 to UTC+11 -# on 2014-12-28 at 02:00. They call UTC+11 "Bougainville Standard Time"; +# The Autonomous Region of Bougainville switched from +10 to +11 +# on 2014-12-28 at 02:00. They call +11 "Bougainville Standard Time"; # abbreviate this as BST. See: # http://www.bougainville24.com/bougainville-issues/bougainville-gets-own-tim… # @@ -620,7 +620,7 @@ Link Pacific/Pago_Pago Pacific/Midway # in US minor outlying islands # From Paul Eggert (2014-06-27): # The International Date Line Act 2011 # http://www.parliament.gov.ws/images/ACTS/International_Date_Line_Act__2011_… -# changed Samoa from UTC-11 to UTC+13, effective "12 o'clock midnight, on +# changed Samoa from -11 to +13, effective "12 o'clock midnight, on # Thursday 29th December 2011". The International Date Line was adjusted # accordingly. @@ -715,7 +715,7 @@ Zone Pacific/Funafuti 11:56:52 - LMT 1901 # 1886-1891; Baker was similar but exact dates are not known. # Inhabited by civilians 1935-1942; U.S. military bases 1943-1944; # uninhabited thereafter. -# Howland observed Hawaii Standard Time (UT-10:30) in 1937; +# Howland observed Hawaii Standard Time (-10:30) in 1937; # see page 206 of Elgen M. Long and Marie K. Long, # Amelia Earhart: the Mystery Solved, Simon & Schuster (2000). # So most likely Howland and Baker observed Hawaii Time from 1935 @@ -1473,7 +1473,7 @@ Zone Pacific/Wallis 12:15:20 - LMT 1901 # Zealand time. I understand that is the time they keep locally, anyhow." # For now, assume this practice goes back to the introduction of standard time # in New Zealand, as this would make Chatham Islands time almost exactly match -# LMT back when New Zealand was at UTC+11:30; also, assume Chatham Islands did +# LMT back when New Zealand was at +11:30; also, assume Chatham Islands did # not observe New Zealand's prewar DST. ############################################################################### @@ -1529,7 +1529,7 @@ Zone Pacific/Wallis 12:15:20 - LMT 1901 # For now, we assume the Ladrones switched at the same time as the Philippines; # see Asia/Manila. -# US Public Law 106-564 (2000-12-23) made UTC+10 the official standard time, +# US Public Law 106-564 (2000-12-23) made +10 the official standard time, # under the name "Chamorro Standard Time". There is no official abbreviation, # but Congressman Robert A. Underwood, author of the bill that became law, # wrote in a press release (2000-12-27) that he will seek the use of "ChST". @@ -1541,15 +1541,15 @@ Zone Pacific/Wallis 12:15:20 - LMT 1901 # "I am certain, having lived there for the past decade, that 'Truk' # (now properly known as Chuuk) ... is in the time zone GMT+10." # -# Shanks & Pottenger write that Truk switched from UTC+10 to UTC+11 +# Shanks & Pottenger write that Truk switched from +10 to +11 # on 1978-10-01; ignore this for now. # From Paul Eggert (1999-10-29): # The Federated States of Micronesia Visitors Board writes in # The Federated States of Micronesia - Visitor Information (1999-01-26) # http://www.fsmgov.org/info/clocks.html -# that Truk and Yap are UTC+10, and Ponape and Kosrae are UTC+11. -# We don't know when Kosrae switched from UTC+12; assume January 1 for now. +# that Truk and Yap are +10, and Ponape and Kosrae are +11. +# We don't know when Kosrae switched from +12; assume January 1 for now. # Midway @@ -1615,11 +1615,11 @@ Zone Pacific/Wallis 12:15:20 - LMT 1901 # ordaining - by a masterpiece of diplomatic flattery - that # the Fourth of July should be celebrated twice in that year." -# Although Shanks & Pottenger says they both switched to UTC-11:30 -# in 1911, and to UTC-11 in 1950. many earlier sources give UTC-11 +# Although Shanks & Pottenger says they both switched to -11:30 +# in 1911, and to -11 in 1950. many earlier sources give -11 # for American Samoa, e.g., the US National Bureau of Standards # circular "Standard Time Throughout the World", 1932. -# Assume American Samoa switched to UTC-11 in 1911, not 1950, +# Assume American Samoa switched to -11 in 1911, not 1950, # and that after 1950 they agreed until (western) Samoa skipped a # day in 2011. Assume also that the Samoas follow the US and New # Zealand's "ST"/"DT" style of daylight-saving abbreviations. diff --git a/backzone b/backzone index 13dc8d4..27a5472 100644 --- a/backzone +++ b/backzone @@ -194,9 +194,9 @@ Zone Africa/Lusaka 1:53:08 - LMT 1903 Mar # Equatorial Guinea # -# Although Shanks says that Malabo switched from UTC to UTC+1 on 1963-12-15, +# Although Shanks says that Malabo switched from +00 to +01 on 1963-12-15, # a Google Books search says that London Calling, Issues 432-465 (1948), p 19, -# says that Spanish Guinea was at GMT+1 back then. The Shanks data entries +# says that Spanish Guinea was at +01 back then. The Shanks data entries # are most likely wrong, but we have nothing better; use them here for now. # Zone Africa/Malabo 0:35:08 - LMT 1912 @@ -479,14 +479,14 @@ Zone Asia/Muscat 3:54:24 - LMT 1920 # From Paul Eggert (2014-08-11), after a heads-up from Stephen Colebourne: # According to a Portuguese decree (1911-05-26) # http://dre.pt/pdf1sdip/1911/05/12500/23132313.pdf -# Portuguese India switched to GMT+5 on 1912-01-01. +# Portuguese India switched to +05 on 1912-01-01. #Zone Asia/Panaji [not enough info to complete] # Cambodia # From Paul Eggert (2014-10-11): # See Asia/Ho_Chi_Minh for the source for most of this data. Also, guess -# (1) Cambodia reverted to UT+7 on 1945-09-02, when Vietnam did, and -# (2) they also reverted to UT+7 on 1953-11-09, the date of independence. +# (1) Cambodia reverted to +07 on 1945-09-02, when Vietnam did, and +# (2) they also reverted to +07 on 1953-11-09, the date of independence. # These guesses are probably wrong but they're better than guessing no # transitions there. Zone Asia/Phnom_Penh 6:59:40 - LMT 1906 Jul 1 @@ -506,8 +506,8 @@ Zone Asia/Tel_Aviv 2:19:04 - LMT 1880 # Laos # From Paul Eggert (2014-10-11): # See Asia/Ho_Chi_Minh for the source for most of this data. -# Trần's book says that Laos reverted to UT+7 on 1955-04-15. -# Also, guess that Laos reverted to UT+7 on 1945-09-02, when Vietnam did; +# Trần's book says that Laos reverted to +07 on 1955-04-15. +# Also, guess that Laos reverted to +07 on 1945-09-02, when Vietnam did; # this is probably wrong but it's better than guessing no transition. Zone Asia/Vientiane 6:50:24 - LMT 1906 Jul 1 7:06:30 - PLMT 1911 May 1 diff --git a/europe b/europe index b02edbd..4219828 100644 --- a/europe +++ b/europe @@ -774,8 +774,6 @@ Zone Europe/Vienna 1:05:21 - LMT 1893 Apr # From Alexander Bokovoy (2014-10-09): # Belarussian government decided against changing to winter time.... # http://eng.belta.by/all_news/society/Belarus-decides-against-adjusting-time… -# From Paul Eggert (2014-10-08): -# Hence Belarus can share time zone abbreviations with Moscow again. # # Zone NAME GMTOFF RULES FORMAT [UNTIL] Zone Europe/Minsk 1:50:16 - LMT 1880 @@ -1294,7 +1292,7 @@ Zone Europe/Paris 0:09:21 - LMT 1891 Mar 15 0:01 # http://www.parlament-berlin.de/pds-fraktion.nsf/727459127c8b66ee85256623004… # says that Bersarin issued an order to use Moscow time on May 20. # However, Moscow did not observe daylight saving in 1945, so -# this was equivalent to CEMT (GMT+3), not GMT+4. +# this was equivalent to +03, not +04. # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S @@ -2258,7 +2256,6 @@ Zone Europe/Bucharest 1:44:24 - LMT 1891 Oct # http://www.worldtimezone.com/dst_news/dst_news_russia-map-2014-07.html # From Paul Eggert (2006-03-22): -# Except for Moscow after 1919-07-01, I invented the time zone abbreviations. # Moscow time zone abbreviations after 1919-07-01, and Moscow rules after 1991, # are from Andrey A. Chernov. The rest is from Shanks & Pottenger, # except we follow Chernov's report that 1992 DST transitions were Sat @@ -3080,9 +3077,6 @@ Zone Asia/Magadan 10:03:12 - LMT 1924 May 2 # in Russian.) In addition, Srednekolymsk appears to be a much older # settlement and the population of Zyryanka seems to be declining. # Go with Srednekolymsk. -# -# Since Magadan Oblast moves to UTC+10 on 2014-10-26, we cannot keep using MAGT -# as the abbreviation. Use SRET instead. Zone Asia/Srednekolymsk 10:14:52 - LMT 1924 May 2 10:00 - +10 1930 Jun 21 diff --git a/localtime.c b/localtime.c index 276ce34..6c00c45 100644 --- a/localtime.c +++ b/localtime.c @@ -1510,7 +1510,7 @@ gmtsub(struct state const *sp, time_t const *timep, int_fast32_t offset, #ifdef TM_ZONE /* ** Could get fancy here and deliver something such as - ** "UT+xxxx" or "UT-xxxx" if offset is non-zero, + ** "+xx" or "-xx" if offset is non-zero, ** but this is no time for a treasure hunt. */ tmp->TM_ZONE = ((char *) diff --git a/northamerica b/northamerica index d66135e..0c069bb 100644 --- a/northamerica +++ b/northamerica @@ -3312,7 +3312,7 @@ Zone America/Miquelon -3:44:40 - LMT 1911 May 15 # St Pierre # indicating that the normal ET rules are followed. # # From Paul Eggert (2014-08-19): -# The 2014-08-13 Cabinet meeting decided to stay on UTC-4 year-round. See: +# The 2014-08-13 Cabinet meeting decided to stay on -04 year-round. See: # http://tcweeklynews.com/daylight-savings-time-to-be-maintained-p5353-127.htm # Model this as a switch from EST/EDT to AST ... # From Chris Walton (2014-11-04): diff --git a/private.h b/private.h index 941e91b..3583079 100644 --- a/private.h +++ b/private.h @@ -15,6 +15,7 @@ ** Thank you! */ +/* This string was in the tzdata Factory zone through version 2016f. */ #define GRANDPARENTED "Local time zone must be set--see zic manual page" /* diff --git a/southamerica b/southamerica index 1c38f63..5321451 100644 --- a/southamerica +++ b/southamerica @@ -410,9 +410,9 @@ Rule Arg 2008 only - Oct Sun>=15 0:00 1:00 S # stuck on Summer daylight savings time even though the summer is over. # From Paul Eggert (2013-09-05): -# Perhaps San Luis operates on the legal fiction that it is at UTC-4 +# Perhaps San Luis operates on the legal fiction that it is at -04 # with perpetual summer time, but ordinary usage typically seems to -# just say it's at UTC-3; see, for example, +# just say it's at -03; see, for example, # http://es.wikipedia.org/wiki/Hora_oficial_argentina # We've documented similar situations as being plain changes to # standard time, so let's do that here too. This does not change UTC -- 2.5.5

12 28

Timezone support in UTC format like in Windows 7
by kailash kumar Aug. 25, 2016

Aug. 25, 2016

Hi All, We wanted to implement timezone support from our web interface where user should be able to select timezone in the following UTC format similar to windows 7 OS. Is it possible to fetch records for timezone from tz database in following UTC format to construct timezone drop down? if yes then how can we set timezone in UTC format like *set timezone UTC+05:30 Chennai,Kolkata,Mumbai,New Delhi* Thanks, KAILASH KUMAR JAIN BE cs Post at: kailashkumarp(a)gmail.com Legal Warning: This message may contain privileged and confidential information. If you are not the intended recipient or for any reason think that this message may have been address to you or reached you as a mistake, its requested that you must not disseminate,copy or take any action in reliance on it and I ask you to delete all copies from your mail box and computer system and also notify me immediately by return e-mail.

5 4

16th century Nuremberg time
by Steve Allen Aug. 24, 2016

Aug. 24, 2016

At the Science of Time Symposium in Cambridge Massachussetts earlier this year Kevin Birth showed a situation that tz does not have to handle. http://gallica.bnf.fr/ark:/12148/btv1b8490533n gives a view of one surviving example of the 1589 Vergleichung nachvolgender siben Uhren This was a chart to translate between the 7 different ways of counting hours (some employing unequal hours) which visitors might know from their home cities (and their pocket sundials) and the hours which were in use by various different clock towers and agencies in Nuremberg. -- Steve Allen <sla(a)ucolick.org> WGS-84 (GPS) UCO/Lick Observatory--ISB 260 Natural Sciences II, Room 165 Lat +36.99855 1156 High Street Voice: +1 831 459 3046 Lng -122.06015 Santa Cruz, CA 95064 http://www.ucolick.org/~sla/ Hgt +250 m

1 0

[PROPOSED PATCH 1/2] Also distribute code and data in a single tarball
by Paul Eggert Aug. 24, 2016

Aug. 24, 2016

Suggested by Arthur David Olson in: https://mm.icann.org/pipermail/tz/2000-January/010789.html * Makefile (GNUTARFLAGS): Add --sort=name, so that the single tarball is more reproducible. (clean): Remove tzdb. (tzdb-$(VERSION).tar.gz): New target. (tarballs): Add it. (tzdb-$(VERSION).tar.gz.asc): New target. (signatures): Add it. * NEWS: Document this. --- Makefile | 21 +++++++++++++++++---- NEWS | 9 +++++++++ 2 files changed, 26 insertions(+), 4 deletions(-) diff --git a/Makefile b/Makefile index fc18819..da697b7 100644 --- a/Makefile +++ b/Makefile @@ -326,7 +326,7 @@ OK_LINE= '^'$(OK_CHAR)'*$$' # Flags to give 'tar' when making a distribution. # Try to use flags appropriate for GNU tar. -GNUTARFLAGS= --numeric-owner --owner=0 --group=0 --mode=go+u,go-w +GNUTARFLAGS= --numeric-owner --owner=0 --group=0 --mode=go+u,go-w --sort=name TARFLAGS= `if tar $(GNUTARFLAGS) --version >/dev/null 2>&1; \ then echo $(GNUTARFLAGS); \ else :; \ @@ -568,7 +568,7 @@ clean_misc: rm -f core *.o *.out \ date tzselect version.h zdump zic yearistype libtz.a clean: clean_misc - rm -fr *.dir $(TZS_NEW) + rm -fr *.dir tzdb $(TZS_NEW) maintainer-clean: clean @echo 'This command is intended for maintainers to use; it' @@ -672,7 +672,8 @@ check_time_t_alternatives: done rm -fr time_t.dir -tarballs: tzcode$(VERSION).tar.gz tzdata$(VERSION).tar.gz +tarballs: tzcode$(VERSION).tar.gz tzdata$(VERSION).tar.gz \ + tzdb-$(VERSION).tar.gz tzcode$(VERSION).tar.gz: set-timestamps.out LC_ALL=C && export LC_ALL && \ @@ -685,7 +686,16 @@ tzdata$(VERSION).tar.gz: set-timestamps.out tar $(TARFLAGS) -cf - $(COMMON) $(DATA) $(MISC) $(TZS) | \ gzip $(GZIPFLAGS) > $@ -signatures: tzcode$(VERSION).tar.gz.asc tzdata$(VERSION).tar.gz.asc +tzdb-$(VERSION).tar.gz: set-timestamps.out + rm -fr tzdb + mkdir tzdb + ln $(COMMON) $(DOCS) $(SOURCES) $(DATA) $(MISC) $(TZS) tzdb + touch -cmr $$(ls -t tzdb/* | sed 1q) tzdb + LC_ALL=C && export LC_ALL && \ + tar $(TARFLAGS) -cf - tzdb | gzip $(GZIPFLAGS) > $@ + +signatures: tzcode$(VERSION).tar.gz.asc tzdata$(VERSION).tar.gz.asc \ + tzdb-$(VERSION).tar.gz.asc tzcode$(VERSION).tar.gz.asc: tzcode$(VERSION).tar.gz gpg --armor --detach-sign $? @@ -693,6 +703,9 @@ tzcode$(VERSION).tar.gz.asc: tzcode$(VERSION).tar.gz tzdata$(VERSION).tar.gz.asc: tzdata$(VERSION).tar.gz gpg --armor --detach-sign $? +tzdb-$(VERSION).tar.gz.asc: tzdb-$(VERSION).tar.gz + gpg --armor --detach-sign $? + typecheck: $(MAKE) clean for i in "long long" unsigned; \ diff --git a/NEWS b/NEWS index 023883b..18b7c9d 100644 --- a/NEWS +++ b/NEWS @@ -32,6 +32,15 @@ Unreleased, experimental changes what should be the output of 'zdump -i -c 2050' on primary zones. 'make check' now checks that zdump generates this output. + A new distribution format is available in the tarball + tzdb-VERSION.tar.gz and the signature tzdb-VERSION.tar.gz.asc. + The new tarball has the contents of tzcodeVERSION.tar.gz and + tzdataVERSION.tar.gz, in a single top-level directory 'tzdb' with + all other files under this directory, as is typical for software + distributions. The new format is intended to replace the old + tarball pair. The old format will continue to be distributed for + a while. + Changes to documentation and commentary tzfile.5 now documents the new restriction on POSIX TZ-like -- 2.5.5

7 12

California keeps DST (to help its crops grow?!)
by Paul Eggert Aug. 23, 2016

Aug. 23, 2016

Today the California Senate rejected Assembly Bill 385, which would have placed a measure on the state ballot asking voters whether to cancel daylight saving time. This is the bill that prompted me to fix some historical inaccuracies in tzdata's Los Angeles entry a few days ago. Sen. Jim Nelson (R-Gerber) voted against the bill, arguing that farmers benefit from DST. He said, "Our crops have gotten accustomed to that. They've in fact been bred to deal with that longer harvest season." You just can't make this stuff up.... Koseff A. Effort to roll back daylight saving time defeated in California Senate. Sacramento Bee 2016-08-23 [misdated as 2016-08-22]. http://www.sacbee.com/news/politics-government/capitol-alert/article9748310…

2 2

[PROPOSED PATCH] Spelling fixes
by Paul Eggert Aug. 23, 2016

Aug. 23, 2016

--- NEWS | 2 +- europe | 4 ++-- factory | 4 ++-- tz-how-to.html | 2 +- 4 files changed, 6 insertions(+), 6 deletions(-) diff --git a/NEWS b/NEWS index 4c0f4e0..fd2bcbb 100644 --- a/NEWS +++ b/NEWS @@ -772,7 +772,7 @@ Release 2014h - 2014-09-25 18:59:03 -0700 zdump -c no longer mishandles transitions near year boundaries. (Thanks to Tim Parenti for reporting the problem.) - An access to uninitalized data has been fixed. + An access to uninitialized data has been fixed. (Thanks to Jörg Richter for reporting the problem.) When THREAD_SAFE is defined, the code ports to the C11 memory model. diff --git a/europe b/europe index 4219828..2ad164b 100644 --- a/europe +++ b/europe @@ -2425,7 +2425,7 @@ Zone Europe/Kaliningrad 1:22:00 - LMT 1893 Apr # attributes the 1982 changes to the Act of the Council of Ministers # of the USSR No. 126 from 18.02.1982. 1980-925.txt also adds # Udmurtia to the list of affected territories and lists Khatangsky -# district separately from Taymyr Autonomous Okurg. Probably erroneously. +# district separately from Taymyr Autonomous Okrug. Probably erroneously. # # The affected territories are currently listed under Europe/Moscow, # Asia/Yekaterinburg and Asia/Krasnoyarsk. @@ -2756,7 +2756,7 @@ Zone Asia/Novosibirsk 5:31:40 - LMT 1919 Dec 14 6:00 # Note that time belts (numbered from 2 (Moscow) to 12 according to their # GMT/UTC offset and having too many exceptions like regions formally # belonging to one belt but using time from another) were replaced -# with time zones in 2011 with different numberings (there was a +# with time zones in 2011 with different numbering (there was a # 2-hour gap between second and third zones in 2011-2014). # From Stepan Golosunov (2016-04-12): diff --git a/factory b/factory index 7c86430..75fa4a1 100644 --- a/factory +++ b/factory @@ -3,8 +3,8 @@ # For distributors who don't want to put time zone specification in # their installation procedures. Users that run 'date' will get the -# time zone abbrevation "-00", indicating that the actual time zone is -# unknown. +# time zone abbreviation "-00", indicating that the actual time zone +# is unknown. # Zone NAME GMTOFF RULES FORMAT Zone Factory 0 - -00 diff --git a/tz-how-to.html b/tz-how-to.html index a777a4e..feb47dd 100644 --- a/tz-how-to.html +++ b/tz-how-to.html @@ -251,7 +251,7 @@ local standard time (different from wall clock time when observing daylight saving time); or it can be suffixed with ‘g’, ‘u’, or ‘z’, all three of which mean the standard time at the -<a href="https://en.wikipedia.org/wiki/Prime_Meridian">prime meridan</a>. +<a href="https://en.wikipedia.org/wiki/Prime_Meridian">prime meridian</a>. ‘g’ stands for “<a href="https://en.wikipedia.org/wiki/Greenwich_Mean_Time">GMT</a>”; ‘u’ stands for “<a -- 2.7.4

1 0

[PROPOSED PATCH] Port 'make check_web' to Fedora
by Paul Eggert Aug. 23, 2016

Aug. 23, 2016

* Makefile (SGML_CATALOG_FILES), NEWS: Port to Fedora 23, where the catalog is in /usr/share/sgml/html/4.01/HTML4.cat. --- Makefile | 8 ++++---- NEWS | 4 ++++ 2 files changed, 8 insertions(+), 4 deletions(-) diff --git a/Makefile b/Makefile index b71211e..f6754af 100644 --- a/Makefile +++ b/Makefile @@ -272,16 +272,16 @@ AWK= awk KSHELL= /bin/bash # The path where SGML DTDs are kept and the catalog file(s) to use when -# validating. The default is appropriate for Ubuntu 13.10. +# validating. The default should work on both Debian and Red Hat. SGML_TOPDIR= /usr SGML_DTDDIR= $(SGML_TOPDIR)/share/xml/w3c-sgml-lib/schema/dtd SGML_SEARCH_PATH= $(SGML_DTDDIR)/REC-html401-19991224 SGML_CATALOG_FILES= \ - $(SGML_TOPDIR)/share/doc/w3-recs/html/www.w3.org/TR/1999/REC-html401-19991224/HTML4.cat + $(SGML_TOPDIR)/share/doc/w3-recs/html/www.w3.org/TR/1999/REC-html401-19991224/HTML4.cat:$(SGML_TOPDIR)/share/sgml/html/4.01/HTML4.cat # The name, arguments and environment of a program to validate your web pages. -# See <http://www.jclark.com/sp/> for a validator, and -# <http://validator.w3.org/source/> for a validation library. +# See <http://openjade.sourceforge.net/doc/> for a validator, and +# <https://validator.w3.org/source/> for a validation library. VALIDATE = nsgmls VALIDATE_FLAGS = -s -B -wall -wno-unused-param VALIDATE_ENV = \ diff --git a/NEWS b/NEWS index 548de8f..4c18e55 100644 --- a/NEWS +++ b/NEWS @@ -42,6 +42,8 @@ Unreleased, experimental changes (Thanks to Jon Skeet for suggesting that an option was needed, and thanks to Tim Parenti and Chris Rovick for further comments.) + Changes to build procedure + The tzdata distribution has a new file to2050.tzs that contains what should be the output of 'zdump -i -c 2050' on primary zones. 'make check' now checks that zdump generates this output. @@ -57,6 +59,8 @@ Unreleased, experimental changes significantly smaller than gzip. (Thanks to Oscar van Vlijmen for comments on the format.) + 'make check_web' now works on Fedora-like distributions. + Changes to documentation and commentary tzfile.5 now documents the new restriction on POSIX TZ-like -- 2.5.5

1 0

Re: [tz] [PROPOSED PATCH 2/2] Use lz format for new tarball
by vanadovv＠hetnet.nl Aug. 22, 2016

Aug. 22, 2016

There are also Windows users, not only *nix users! So, please use a compression format that can be handled easily by Windows users as well. For instance, choose a format from the list that 7Zip can handle: http://www.7-zip.org/ Yes, I know, one can allways install yet again another program for one purpose only (http://lzip.nongnu.org/lzip.html) but let's try to keep things simple. Cheers! Oscar van Vlijmen >----Origineel Bericht---- >Van : eggert(a)cs.ucla.edu >Datum : 22/08/2016 05:56 >Aan : tz(a)iana.org >Onderwerp : [tz] [PROPOSED PATCH 2/2] Use lz format for new tarball > [snip] >index 18b7c9d..61213b0 100644 >--- a/NEWS >+++ b/NEWS >@@ -33,13 +33,14 @@ Unreleased, experimental changes > 'make check' now checks that zdump generates this output. > > A new distribution format is available in the tarball >- tzdb-VERSION.tar.gz and the signature tzdb-VERSION.tar.gz.asc. >+ tzdb-VERSION.tar.lz and the signature tzdb-VERSION.tar.lz.asc. > The new tarball has the contents of tzcodeVERSION.tar.gz and > tzdataVERSION.tar.gz, in a single top-level directory 'tzdb' with > all other files under this directory, as is typical for software > distributions. The new format is intended to replace the old > tarball pair. The old format will continue to be distributed for >- a while. >+ a while. The new format uses lzip compression, which is >+ significantly smaller than gzip and is simpler than xz. > > Changes to documentation and commentary > >-- >2.5.5

2 1

The West Wing: 20 Hours in America
by Matt Johnson Aug. 21, 2016

Aug. 21, 2016

This is already mentioned in the arts file, but I just found a clip of it: https://www.youtube.com/watch?v=-J1NHzQ1sgc Cheers! -Matt

2 1