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Re: Some modifications of China related timezone info.
by Zhe Su April 28, 2006

April 28, 2006

Hi, Following this rule, "Asia/Beijing" should be used instead of "Asia/Shanghai", because more people prefer "Asia/Beijing" in China, as Beijing has more people than Shanghai :-) Regards James Su On 4/28/06, Robert Elz <kre(a)munnari.oz.au> wrote: > Date: Thu, 27 Apr 2006 22:54:12 -0400 > From: John Hawkinson <jhawk(a)MIT.EDU> > Message-ID: <20060428025412.GN677(a)multics.mit.edu> > > | I can't say I see quite why it is such a bad thing to make exceptions > | in the uniform policy where they are clearly understandable and > | preferred by most people... I'm skeptical of claims of > | non-scalability. > > The scalability that matters isn't what the zoneinfo files can handle, > but what this mailing list can handle. > > Having a simple rule that always gets followed allows us to ignore > endless arguments about what is, or is not, "preferred by most > people", and how anyone could ever really tell (when that argument is > made, 99% of the time, it means "I prefer".) > > Of course, we still periodically get this discussion - but at least > there's just one of this one, and not the many "this name is better than that name" > for any arbitrary name. > > kre >

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FW: FW: Timezone file asia
by Olson, Arthur David (NIH/NCI) [E] April 27, 2006

April 27, 2006

K. Sethu is not on the time zone mailing list; direct replies appropriately. --ado ________________________________ From: K Sethu [mailto:skhome@gmail.com] Sent: Wednesday, April 26, 2006 12:17 AM To: tz(a)lecserver.nci.nih.gov Subject: Fwd: FW: Timezone file asia On request of Paul Eggert <eggert(a)cs.ucla.edu> I am forwarding to tz(a)elsie.nci.nih.gov herewith my email to Paul Eggert and Nimal Ratnayake. Furhter Nimal's first message, Paul's response to it and Paul's response to my following message are also copied in that order for reference below the following forwarded message K. Sethu ---------- Forwarded message ---------- From: K Sethu <skhome(a)gmail.com> Date: Apr 25, 2006 11:12 AM Subject: Re: FW: Timezone file asia To: Paul Eggert < eggert(a)cs.ucla.edu> Cc: Nimal Ratnayake <nimalr(a)pdn.ac.lk> On 4/25/06, Paul Eggert < eggert(a)cs.ucla.edu <mailto:eggert@cs.ucla.edu> > wrote: > Nimal Ratnayake <nimalr(a)pdn.ac.lk> writes: > > > Actually although the time offset is the same as IST, we call it Sri > > Lanka Time. > > I am tryinng to get some authoritative info from organizations like > > the Meteorological > > Department, Sri Lanka Standards Institute or ICT Agency of the government. > > Thanks. I'm also interested as to when this name came into common use. > > (Presumably it was not called "Sri Lanka Time" back in 1920. :-) > I think the abbreviation LKT originated from the world of computers at the time of or subsequent to the time zone changes by SL Government twice in 1996 and probably SL Government or its standardization /ict agencies never decalred an abbreviation as national standard. I recollect before the recent change the government annoucemments mentioning it as simply changing Sri Lanka Standard Time or Sri Lanka Time and no mention was made about the abbreviation. If we look at Sri Lanka Department of Government's "Official News Website of Sri Lanka" - for current page at http://www.news.lk/ we can see that they use SLT as abbreviation in time stamp at the beginning of each news item - for example: Tuesday 25-04-2006 SLT 09:30 (+05:30 GMT). For an example before the recent change, look at: http://www.news.lk/news_2006_04_072.htm - this has the news item on cabinet decision for changing of time and the time stamp then was Friday 07-04-2006 SLT 06:30 (+06:00 GMT). So question arises whether SLT was at any time adopted as standard abbreviation by the government. Within Sri Lanka I think LKT is well known among computer users and adminsitrators. In my opinion SLT may not be a good choice because the nation's largest telcom / internet operator Sri Lanka Telcom is well known by that abbreviation - simply as SLT (there IP domains are slt.lk and sltnet.lk ). But if indeed our government has adopted SLT as standard abbreviation (that we have not known so far) then it is better that it be used for all computers. Hope Nimal gets more authoratative information in his investigations ~Sethu ------------------------------------------------------------------------ - Previous messages> From: Nimal Ratnayake <nimalr(a)pdn.ac.lk > Mailed-By: pdn.ac.lk To: Paul Eggert <eggert(a)cs.ucla.edu> Cc: K Sethu <skhome(a)gmail.com > Date: Apr 24, 2006 9:44 PM Subject: Re: FW: Timezone file asia Hi, >It was "IST" from 1906 (when Colombo switched from Moratuwa Mean Time >to India time) through 1996 (when Colombo switched away from India >time), so I thought, it more consistent to revert back to the old >abbreviation. > >But perhaps this isn't correct. What do English-speaking people >typically say when they want to talk about the time zone used in >Colombo nowadays? If they say "Sri Lanka time" then LKT would be more >appropriate. > >One possibility is that we wait for a bit for the dust to settle down >and then see what people actually say in practice. > > > Actually although the time offset is the same as IST, we call it Sri Lanka Time. I am tryinng to get some authoritative info from organizations like the Meteorological Department, Sri Lanka Standards Institute or ICT Agency of the government. >While we're on the subject of Sri Lanka time, Peter Apps and Ranga >Sirilal reported on April 12 that the Tamil Tigers "never accepted the >original 1996 time change and simply kept their clocks set five and a >half hours ahead of Greenwich Mean Time (GMT), in line with neighbor >India." See >< http://today.reuters.co.uk/news/newsArticle.aspx?type=scienceNews&storyI D=2006-04-12T172228Z_01_COL295762_RTRIDST_0_SCIENCE-SRILANKA-TIME-DC.XML <http://today.reuters.co.uk/news/newsArticle.aspx?type=scienceNews&story ID=2006-04-12T172228Z_01_COL295762_RTRIDST_0_SCIENCE-SRILANKA-TIME-DC.XM L> >. >They also report that Buddhist temples and astrologers' offices stuck >with India time, but that's of less importance to us, since we focus >on civil time. > >As luck would have it, though, people who live in regions under Tamil >control (or who live in Buddhist temples etc.) can simply use >TZ='Asia/Calcutta', as that zone has been correct for these regions >since our cutoff date of 1970. However, I suppose I should add a >comment to this effect in the Sri Lanka part of the database. > > > Yes. I think that would be appropriate. Nimal Ratnayake -------------------------------------------------------------------- From: Paul Eggert <eggert(a)cs.ucla.edu > Mailed-By: cs.ucla.edu To: Nimal Ratnayake <nimalr(a)pdn.ac.lk> Cc: K Sethu <skhome(a)gmail.com > Date: Apr 25, 2006 1:12 AM Subject: Re: FW: Timezone file asia Nimal Ratnayake <nimalr(a)pdn.ac.lk> writes: > Actually although the time offset is the same as IST, we call it Sri > Lanka Time. > I am tryinng to get some authoritative info from organizations like > the Meteorological > Department, Sri Lanka Standards Institute or ICT Agency of the government. Thanks. I'm also interested as to when this name came into common use. (Presumably it was not called "Sri Lanka Time" back in 1920. :-) --------------------------------------------------------------------- From: Paul Eggert <eggert(a)cs.ucla.edu> Mailed-By: cs.ucla.edu To: K Sethu <skhome(a)gmail.com> Cc: Nimal Ratnayake <nimalr(a)pdn.ac.lk> Date: Apr 25, 2006 5:40 PM Subject: Re: FW: Timezone file asia "K Sethu" < skhome(a)gmail.com> writes: > Within Sri Lanka I think LKT is well known among computer users and > adminsitrators. In my opinion SLT may not be a good choice because the > nation's largest telcom / internet operator Sri Lanka Telcom is well > known by that abbreviation - simply as SLT (there IP domains are > slt.lk <http://slt.lk/> and sltnet.lk <http://sltnet.lk/> ). > > But if indeed our government has adopted SLT as standard abbreviation > (that we have not known so far) then it is better that it be used for > all computers. Thanks for your discussion; it has convinced me to use either LKT or SLT in the next update. Could you please send a copy of your email to < tz(a)elsie.nci.nih.gov>? Thanks. > Hope Nimal gets more authoratative information in his > investigations Yes, I'd also like to know about SLT versus LKT. Thanks.

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Re: Some modifications of China related timezone info.
by Robert Elz April 27, 2006

April 27, 2006

Date: Thu, 27 Apr 2006 22:54:12 -0400 From: John Hawkinson <jhawk(a)MIT.EDU> Message-ID: <20060428025412.GN677(a)multics.mit.edu> | I can't say I see quite why it is such a bad thing to make exceptions | in the uniform policy where they are clearly understandable and | preferred by most people... I'm skeptical of claims of | non-scalability. The scalability that matters isn't what the zoneinfo files can handle, but what this mailing list can handle. Having a simple rule that always gets followed allows us to ignore endless arguments about what is, or is not, "preferred by most people", and how anyone could ever really tell (when that argument is made, 99% of the time, it means "I prefer".) Of course, we still periodically get this discussion - but at least there's just one of this one, and not the many "this name is better than that name" for any arbitrary name. kre

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Re: Some modifications of China related timezone info.
by Zhe Su April 27, 2006

April 27, 2006

Hi, I don't think modifying front ends is a resonable way for us. Those front ends are out of our control, there is no way for us to convince them to change their front ends. Even if we could convince some of them, it's impossible for us to know and convince all front ends which use tzdata in the world. The simplest way for us is to convince you to modify tzdata, so that all available front ends can benefit from it. Regards James Su On 4/22/06, Paul Eggert <eggert(a)cs.ucla.edu> wrote: > "Zhe Su" <james.su(a)gmail.com> writes: > > > Unfortunately, most front ends (at least on GNU/Linux system) > > expose timezone identifiers like "Asia/Shanghai" to end users directly. > > Then let's focus on getting those front ends fixed the way you like. > > Which front ends are they? The tz code ships only one front end, > called tzselect, which works as shown at the end of this message. > Note that at the crucial decision point, the user selects a #1 entry > labeled "Beijing". So at least this front end works the way that you > like. Perhaps all you need to do is to convince your distributors to > switch to tzselect. Another possibility is for you to find out which > front ends people are using, and fix those front ends. > > $ tzselect > Please identify a location so that time zone rules can be set correctly. > Please select a continent or ocean. > 1) Africa > 2) Americas > 3) Antarctica > 4) Arctic Ocean > 5) Asia > 6) Atlantic Ocean > 7) Australia > 8) Europe > 9) Indian Ocean > 10) Pacific Ocean > 11) none - I want to specify the time zone using the Posix TZ format. > #? 5 > Please select a country. > 1) Afghanistan 18) Israel 35) Palestine > 2) Armenia 19) Japan 36) Philippines > 3) Azerbaijan 20) Jordan 37) Qatar > 4) Bahrain 21) Kazakhstan 38) Russia > 5) Bangladesh 22) Korea (North) 39) Saudi Arabia > 6) Bhutan 23) Korea (South) 40) Singapore > 7) Brunei 24) Kuwait 41) Sri Lanka > 8) Cambodia 25) Kyrgyzstan 42) Syria > 9) China 26) Laos 43) Taiwan > 10) Cyprus 27) Lebanon 44) Tajikistan > 11) East Timor 28) Macau 45) Thailand > 12) Georgia 29) Malaysia 46) Turkmenistan > 13) Hong Kong 30) Mongolia 47) United Arab Emirates > 14) India 31) Myanmar (Burma) 48) Uzbekistan > 15) Indonesia 32) Nepal 49) Vietnam > 16) Iran 33) Oman 50) Yemen > 17) Iraq 34) Pakistan > #? 9 > Please select one of the following time zone regions. > 1) east China - Beijing, Guangdong, Shanghai, etc. > 2) Heilongjiang > 3) central China - Gansu, Guizhou, Sichuan, Yunnan, etc. > 4) Tibet & most of Xinjiang Uyghur > 5) southwest Xinjiang Uyghur > #? 1 > > The following information has been given: > > China > east China - Beijing, Guangdong, Shanghai, etc. > > Therefore TZ='Asia/Shanghai' will be used. > Local time is now: Sat Apr 22 01:03:53 CST 2006. > Universal Time is now: Fri Apr 21 17:03:53 UTC 2006. > Is the above information OK? > 1) Yes > 2) No > #? 1 > > You can make this change permanent for yourself by appending the line > TZ='Asia/Shanghai'; export TZ > to the file '.profile' in your home directory; then log out and log in again. > > Here is that TZ value again, this time on standard output so that you > can use the ./tzselect command in shell scripts: > Asia/Shanghai > > >

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Re: Some modifications of China related timezone info.
by John Hawkinson April 27, 2006

April 27, 2006

[ Hmm. This is a bit dated, I guess. ] Paul Eggert <eggert(a)cs.ucla.edu> wrote on Fri, 21 Apr 2006 at 10:07:38 -0700 in <877j5ix3fp.fsf(a)penguin.cs.ucla.edu>: > "Zhe Su" <james.su(a)gmail.com> writes: > > > Unfortunately, most front ends (at least on GNU/Linux system) > > expose timezone identifiers like "Asia/Shanghai" to end users directly. > > Then let's focus on getting those front ends fixed the way you like. It seems like this is a bit naive. Users encounter the $TZ environment variable if they are doing something "out of the ordinary." Users encounter the timezone in the filesystem (/etc/localtime symlinks). But perhaps, most keenly, it is those time geeks who pay close attention to the zone (and manipulate it) who are ticked off (ha ha) by things like Asia/Shanghai, or America/New_York. Somehow, I kind of doubt tzselect will ever solve this. I can't say I see quite why it is such a bad thing to make exceptions in the uniform policy where they are clearly understandable and preferred by most people... I'm skeptical of claims of non-scalability. --jhawk

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Re: Wisconsin's variation of CDT
by Jonathan Lennox April 27, 2006

April 27, 2006

On Wednesday, April 26 2006, "Larry M. Smith" wrote to "tz(a)lecserver.nci.nih.gov" saying: > I have documentation for Wisconsin's variation of CDT. > http://www.legis.state.wi.us/statutes/Stat0175.pdf; The federal Uniform Time Act explicitly says b. State laws superseded It is hereby declared that it is the express intent of Congress by this section to supersede any and all laws of the States or political subdivisions thereof insofar as they may now or hereafter provide for advances in time or changeover dates different from those specified in this section. So Federal law supersedes any Wisconsin rules since the Uniform Time Act was passed in 1966. (I imagine a bar owner could successfully challenge their ticket in court.) -- Jonathan Lennox lennox(a)cs.columbia.edu

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Re: Wisconsin's variation of CDT
by Robert Elz April 27, 2006

April 27, 2006

Date: Thu, 27 Apr 2006 00:38:20 -0700 From: Paul Eggert <eggert(a)CS.UCLA.EDU> Message-ID: <87mze7foyb.fsf(a)penguin.cs.ucla.edu> | If I understand you correctly, people in Wisconsin actually keep their | clocks according to the federal rules, Do you really believe that almost anyone (members of this list perhaps excepted) actually changes their clock at the precise instant that DST (or summer time, or whatever it gets called in different areas) actually changes. The normal "instruction" (or advice) that I recall is "put your clock forward (or back) before you go to bed tonight". If that's true, then the "people actually keep their clocks" test is pretty much irrelevant for this particular question. More likely to be relevant would be what time the radio stations announce during the "different" hour (forget TV, aside from perhaps teletext) - and I wouldn't be too surprised to discover that they may perhaps even announce both times... (I guess someone who lives there, and is actually listening to a radio during the relevant hour, would need to answer this - or perhaps find a radio station (or a few) and ask what their policy is). That would most likely be the only common practice which applies to this particular question (which is quite different from the more mormal one of whether or not a community observes DST at all). kre

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proposed patch for Guatemala, Nicaragua, Indiana, Nova Scotia, etc.
by Paul Eggert April 27, 2006

April 27, 2006

Since the Guatemala and Nicaragua changes are relatively urgent, here are the proposed tz patches that I've been accumulating recently. Thanks again to everyone who's contributed. Changes to time stamps that take effect this weekend: * Guatemala has DST this year from 04-30 00:00 to 10-01 00:00. (Thanks to Oscar van Vlijmen and Gwillim Law for this info.) * Nicaragua has DST this year from 04-30 02:00 to sometime around September 1, we think; for now, guess 09-03 02:00. (Thanks to worldtimezone.com and Jesper Norgaard Welen for this info.) Changes to historical time stamps: * Nicaragua's early 1990s experiment was in 1992, not 1993, fixing a typo in my earlier reading of Shanks. Also, the experiment changed standard time temporarily instead of instituting DST. The late 1990s change was in 1997, not 1998. (This is all taken from the latest edition of Shanks & Pottenger, for which thanks.) Changes to zone.tab and commentary only: * Martin and Pulaski Counties, Indiana, have decided not to rebel against the federal decision after all. Changes to commentary only. * Nova Scotia and Northwest Territories announced they will follow the US lead next year too. (Thanks to Chris Walton for this.) * The Philippines are considering adopting DST this June, and may have used DST for a month or so in 1990. (Thanks to Jesper Norgaard Welen for the info about 1990.) * Common usage for Sri Lanka's local time might not be "IST" these days. (Thanks to Nimal Ratnayake and K Sethu for this info; they are looking into what common practice is after things settle down after the recent UTC offset change.) * Wisconsin state law specifies 01:00 as the legal DST switchover time, even though everybody actually switches at 02:00; this leads to tickets being given to bar owners. (Thanks to Larry M. Smith for this info.) * The wording for the Mandan 2003-10-26 switch was unclear. (Thanks to Jesper Norgaard Welen for this.) =================================================================== RCS file: RCS/asia,v retrieving revision 2006.4 retrieving revision 2006.4.0.1 diff -pu -r2006.4 -r2006.4.0.1 --- asia 2006/04/17 18:30:44 2006.4 +++ asia 2006/04/27 06:43:00 2006.4.0.1 @@ -1467,6 +1467,20 @@ Zone Asia/Gaza 2:17:52 - LMT 1900 Oct # be immediately followed by 1845-01-01. Robert H. van Gent has a # transcript of the decree in <http://www.phys.uu.nl/~vgent/idl/idl.htm>. # The rest of the data are from Shanks & Pottenger. + +# From Paul Eggert (2006-04-25): +# Tomorrow's Manila Standard reports that the Philippines Department of +# Trade and Industry is considering adopting DST this June when the +# rainy season begins. See +# <http://www.manilastandardtoday.com/?page=politics02_april26_2006>. +# For now, we'll ignore this, since it's not definite and we lack details. +# +# From Jesper Norgaard Welen (2006-04-26): +# ... claims that Philippines had DST last time in 1990: +# http://story.philippinetimes.com/p.x/ct/9/id/145be20cc6b121c0/cid/3e5bbccc7… +# [a story dated 2006-04-25 by Cris Larano of Dow Jones Newswires, +# but no details] + # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S Rule Phil 1936 only - Nov 1 0:00 1:00 S Rule Phil 1937 only - Feb 1 0:00 0 - @@ -1531,6 +1545,44 @@ Zone Asia/Singapore 6:55:25 - LMT 1901 J # 0030 hrs on April 15, 2006 (midnight of April 14, 2006 +30 minutes) # at present, become 2400 hours of April 14, 2006 (midnight of April 14, 2006). +# From Peter Apps and Ranga Sirila of Reuters (2006-04-12) in: +# <http://today.reuters.co.uk/news/newsArticle.aspx?type=scienceNews&storyID=2…> +# [The Tamil Tigers] never accepted the original 1996 time change and simply +# kept their clocks set five and a half hours ahead of Greenwich Mean +# Time (GMT), in line with neighbor India. +# From Paul Eggert (2006-04-18): +# People who live in regions under Tamil control can use TZ='Asia/Calcutta', +# as that zone has agreed with the Tamil areas since our cutoff date of 1970. + +# From K Sethu (2006-04-25): +# I think the abbreviation LKT originated from the world of computers at +# the time of or subsequent to the time zone changes by SL Government +# twice in 1996 and probably SL Government or its standardization +# agencies never declared an abbreviation as a national standard. +# +# I recollect before the recent change the government annoucemments +# mentioning it as simply changing Sri Lanka Standard Time or Sri Lanka +# Time and no mention was made about the abbreviation. +# +# If we look at Sri Lanka Department of Government's "Official News +# Website of Sri Lanka" ... http://www.news.lk/ we can see that they +# use SLT as abbreviation in time stamp at the beginning of each news +# item.... +# +# Within Sri Lanka I think LKT is well known among computer users and +# adminsitrators. In my opinion SLT may not be a good choice because the +# nation's largest telcom / internet operator Sri Lanka Telcom is well +# known by that abbreviation - simply as SLT (there IP domains are +# slt.lk and sltnet.lk). +# +# But if indeed our government has adopted SLT as standard abbreviation +# (that we have not known so far) then it is better that it be used for +# all computers. + +# From Paul Eggert (2006-04-25): +# One possibility is that we wait for a bit for the dust to settle down +# and then see what people actually say in practice. + # Zone NAME GMTOFF RULES FORMAT [UNTIL] Zone Asia/Colombo 5:19:24 - LMT 1880 5:19:32 - MMT 1906 # Moratuwa Mean Time =================================================================== RCS file: RCS/northamerica,v retrieving revision 2006.4 retrieving revision 2006.4.0.2 diff -pu -r2006.4 -r2006.4.0.2 --- northamerica 2006/04/17 18:30:44 2006.4 +++ northamerica 2006/04/27 07:36:46 2006.4.0.2 @@ -301,6 +301,13 @@ Zone America/New_York -4:56:02 - LMT 188 # Nebraska, eastern North Dakota, Oklahoma, eastern South Dakota, # western Tennessee, most of Texas, Wisconsin +# From Larry M. Smith (2006-04-26) re Wisconsin: +# http://www.legis.state.wi.us/statutes/Stat0175.pdf ... +# is currently enforced at the 01:00 time of change. Because the local +# "bar time" in the state corresponds to 02:00, a number of citations +# are issued for the "sale of class 'B' alcohol after prohibited +# hours" within the deviated hour of this change every year.... + # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER Rule Chicago 1920 only - Jun 13 2:00 1:00 D Rule Chicago 1920 1921 - Oct lastSun 2:00 0 S @@ -322,7 +329,7 @@ Zone America/North_Dakota/Center -6:45:1 -7:00 US M%sT 1992 Oct 25 02:00 -6:00 US C%sT # Morton County, ND, switched from mountain to central time on -# 2003-10-26, except for the area around Mandan. +# 2003-10-26, except for the area around Mandan which was already central time. # See <http://dmses.dot.gov/docimages/p63/135818.pdf>. # Officially this switch also included part of Sioux County, and # Jones, Mellette, and Todd Counties in South Dakota; @@ -544,17 +551,9 @@ Zone America/Boise -7:44:49 - LMT 1883 N # - Clark, Floyd, and Harrison counties have been like # America/Kentucky/Louisville. # -# - Daviess, Dubois, Knox, and Perry counties +# - Daviess, Dubois, Knox, Martin, Perry, and Pulaski counties # have been like America/Indiana/Vincennes. # -# - Officially, Martin and Pulaski counties have also been like -# America/Indiana/Vincennes, but an AP article on Pulaski county -# <http://www.indystar.com/apps/pbcs.dll/article?AID=/20060207/NEWS01/60207040…> -# (2006-02-07) and an InsideINdianaBusiness.com report on Martin county -# <http://www.insideindianabusiness.com/newsitem.asp?ID=17202> (2006-03-15) -# say that the county commissioners have voted to stay on eastern time in -# 2006, which means they are actually like America/Indiana/Indianopolis. -# # - Crawford, Pike, Starke, and Switzerland counties have their own time zone # histories as noted below. # @@ -619,7 +618,7 @@ Zone America/Indiana/Marengo -5:45:23 - -5:00 - EST 2006 -5:00 US E%sT # -# Daviess, Dubois, Knox, and Perry Counties, Indiana, +# Daviess, Dubois, Knox, Martin, Perry, and Pulaski Counties, Indiana, # switched from eastern to central time in April 2006. # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER Rule Vincennes 1946 only - Apr lastSun 2:00 1:00 D @@ -901,7 +900,7 @@ Zone America/Menominee -5:50:27 - LMT 18 # U.S. and the rest of Canada.... # http://www2.news.gov.bc.ca/news_releases_2005-2009/2006AG0014-000330.htm -# From Paul Eggert (2006-04-09): +# From Paul Eggert (2006-04-25): # H. David Matthews and Mary Vincent's map # <a href="http://www.canadiangeographic.ca/Magazine/SO98/geomap.asp"> # "It's about TIME", _Canadian Geographic_ (September-October 1998) @@ -915,7 +914,7 @@ Zone America/Menominee -5:50:27 - LMT 18 # Its unofficial information is often taken from Matthews and Vincent. # # CBC News reported that Ontario and Manitoba have announced plans to -# follow the US change, and that Nova Scotia is considering it; see +# follow the US change; see # <http://www.cbc.ca/news/background/daylightsavingtime/> (2005-10-21). # CBC news also reported that Prince Edward Island is the first # province in Atlantic Canada to follow the US change, and that Quebec @@ -1016,6 +1015,11 @@ Zone America/Goose_Bay -4:01:40 - LMT 18 # in Canada to observe DST in 1971 but not 1970; for now we'll assume # this is a typo. +# From Chris Walton (2006-04-25): +# Daylight saving time will be extended by four weeks starting in 2007.... +# Here is a news release which was issued today by the Nova Scotia government: +# http://www.gov.ns.ca/news/details.asp?id=20060425004 + # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S Rule Halifax 1916 only - Apr 1 0:00 1:00 D Rule Halifax 1916 only - Oct 1 0:00 0 S @@ -1593,6 +1597,10 @@ Zone America/Dawson_Creek -8:00:56 - LMT # From Paul Eggert (2005-07-26): # For lack of better information, assume that Southampton Island observed # daylight saving only during wartime. +# +# From Chris Walton (2006-04-25): +# Daylight saving time will be extended by four weeks starting in 2007.... +# http://www.cbc.ca/north/story/nor-nwt-time-change.html # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S Rule NT_YK 1918 only - Apr 14 2:00 1:00 D @@ -2097,6 +2105,14 @@ Zone America/Guadeloupe -4:06:08 - LMT 1 -4:00 - AST # Guatemala +# +# From Gwillim Law (2006-04-22), after a heads-up from Oscar van Vlijmen: +# Diario Co Latino, at +# http://www.diariocolatino.com/internacionales/detalles.asp?NewsID=8079, +# says in an article dated 2006-04-19 that the Guatemalan government had +# decided on that date to advance official time by 60 minutes, to lessen the +# impact of the elevated cost of oil.... Daylight saving time will last from +# 2006-04-29 24:00 (Guatemalan standard time) to 2006-09-30 (time unspecified). # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S Rule Guat 1973 only - Nov 25 0:00 1:00 D Rule Guat 1974 only - Feb 24 0:00 0 S @@ -2104,6 +2120,8 @@ Rule Guat 1983 only - May 21 0:00 1:00 D Rule Guat 1983 only - Sep 22 0:00 0 S Rule Guat 1991 only - Mar 23 0:00 1:00 D Rule Guat 1991 only - Sep 7 0:00 0 S +Rule Guat 2006 only - Apr 30 0:00 1:00 D +Rule Guat 2006 only - Oct 1 0:00 0 S # Zone NAME GMTOFF RULES FORMAT [UNTIL] Zone America/Guatemala -6:02:04 - LMT 1918 Oct 5 -6:00 Guat C%sT @@ -2198,9 +2216,7 @@ Zone America/Montserrat -4:08:52 - LMT 1 # Nicaragua # -# From Steffen Thorsen (1998-12-29): -# Nicaragua seems to be back at -6:00 but I have not been able to find when -# they changed from -5:00. +# This uses Shanks & Pottenger for times before 2005. # # From Steffen Thorsen (2005-04-12): # I've got reports from 8 different people that Nicaragua just started @@ -2214,8 +2230,7 @@ Zone America/Montserrat -4:08:52 - LMT 1 # # From Paul Eggert (2005-05-01): # The decree doesn't say anything about daylight saving, but for now let's -# assume that it is daylight saving and that they'll switch back on the -# 3rd Sunday in September. +# assume that it is daylight saving.... # # From Gwillim Law (2005-04-21): # The Associated Press story on the time change, which can be found at @@ -2233,20 +2248,32 @@ Zone America/Montserrat -4:08:52 - LMT 1 # http://www.presidencia.gob.ni/presidencia/files_index/secretaria/comunicado… # (2005-09-26) # +# From Jesper Norgaard Welen (2006-04-24): +# http://www.elnuevodiario.com.ni/2006/04/26/nacionales/18036 +# It claims that DST will start 2006-04-30 at 2:00, and will last until the +# end of august (without being more specific). +# From Paul Eggert (2006-04-26): +# Yesterday the president of Nicaragua announced that DST will begin +# April 30 at 02:00. No end date was announced. +# http://www.presidencia.gob.ni/Presidencia/Files_index/Secretaria/Comunicado… +# For now, assume DST ends first Sunday in September at 02:00. +# # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S Rule Nic 1979 1980 - Mar Sun>=16 0:00 1:00 D Rule Nic 1979 1980 - Jun Mon>=23 0:00 0 S -Rule Nic 1992 only - Jan 1 4:00 1:00 D -Rule Nic 1992 only - Sep 24 0:00 0 S Rule Nic 2005 only - Apr 10 0:00 1:00 D Rule Nic 2005 only - Oct 2 0:00 0 S +Rule Nic 2006 only - Apr 30 2:00 1:00 D +Rule Nic 2006 only - Sep Sun>=1 2:00 0 S # Zone NAME GMTOFF RULES FORMAT [UNTIL] Zone America/Managua -5:45:08 - LMT 1890 -5:45:12 - MMT 1934 Jun 23 # Managua Mean Time? -6:00 - CST 1973 May -5:00 - EST 1975 Feb 16 - -6:00 Nic C%sT 1993 Jan 1 4:00 - -5:00 - EST 1998 Dec + -6:00 Nic C%sT 1992 Jan 1 4:00 + -5:00 - EST 1992 Sep 24 + -6:00 - CST 1993 + -5:00 - EST 1997 -6:00 Nic C%sT # Panama =================================================================== RCS file: RCS/zone.tab,v retrieving revision 2006.3 retrieving revision 2006.3.0.1 diff -pu -r2006.3 -r2006.3.0.1 --- zone.tab 2006/04/03 14:04:45 2006.3 +++ zone.tab 2006/04/27 06:43:00 2006.3.0.1 @@ -376,7 +376,7 @@ US +382232-0862041 America/Indiana/Maren US +411745-0863730 America/Indiana/Knox Eastern Time - Indiana - Starke County US +384452-0850402 America/Indiana/Vevay Eastern Time - Indiana - Switzerland County US +415100-0873900 America/Chicago Central Time -US +384038-0873143 America/Indiana/Vincennes Central Time - Indiana - Daviess, Dubois, Knox & Perry Counties +US +384038-0873143 America/Indiana/Vincennes Central Time - Indiana - Daviess, Dubois, Knox, Martin, Perry & Pulaski Counties US +382931-0871643 America/Indiana/Petersburg Central Time - Indiana - Pike County US +450628-0873651 America/Menominee Central Time - Michigan - Dickinson, Gogebic, Iron & Menominee Counties US +470659-1011757 America/North_Dakota/Center Central Time - North Dakota - Oliver County

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Wisconsin's variation of CDT
by Larry M. Smith April 27, 2006

April 27, 2006

I have documentation for Wisconsin's variation of CDT. http://www.legis.state.wi.us/statutes/Stat0175.pdf; 175.09, enacted in 1923, sets Wisconsin time to "central time" and provides penalties for businesses not following the "standard of time." In 1957 Wisconsin deviated from the rest of the central zone by enacting statute 175.095. This statute directs that Central Daylight Time will being at 1 A.M. on the last Sunday of April. Updated versions of this statute only changed the day of change and kept the time of change at 1 A.M. < http://www.legis.state.wi.us/statutes/Stat0175.pdf > Before the addition of statute 175.095 it was assumed that statute 175.09 did not override Central Daylight Time (Opinions of the Attorney General of the State of Wisconsin - 1942), with his opinion that "[...] that the words 'commonly known as central time' are more than merely descriptive and that they in fact constitute the definition of standard time in the state of Wisconsin." Adding, "I may say in concluding this opinion that there seems to be some misunderstanding as to the purpose of the Wisconsin law relating to standard time. It has been referred to in many instances as an anti-daylight-saving statute. Such a statement is, in my opinion, inaccurate." It should be assumed that Wisconsin followed the America/Chicago rules before 1957, when the 175.095 statute was passed into law. During the years of 1974 and 1975 this statute appears to have been ignored entirely in favor of the Federal law, as it would have advanced time additionally one extra hour. (Opinions of the Attorney General of the State of Wisconsin - 1974) In 1987 this statute (175.095) was updated to reflect the date change, however the time 1 A.M. was left in place. Operationally this statute is currently enforced at the 1 A.M. time of change. Because the local "bar time" in the state corresponds to 2 A.M., a number of citations are issued for the "sale of class 'B' alcohol after prohibited hours" within the deviated hour of this change every year (0100-to-0200 America/Chicago, 0200-0300 America/Wisconsin). Should anyone require additional comments, please contact Larry M. Smith <SgtChains-TZ(a)FahQ2.com> Rule Wisconsin 1957 1973 - Apr lastSun 1:00 1:00 D Rule Wisconsin 1957 max - Oct lastSun 2:00 0 S Rule Wisconsin 1976 1986 - Apr lastSun 1:00 1:00 D Rule Wisconsin 1987 max - Apr Sun>=1 1:00 1:00 D # Zone NAME GMTOFF RULES FORMAT [UNTIL] Zone America/Wisconsin -5:50:36 - LMT 1883 Nov 18 12:09:24 -6:00 US C%sT 1920 -6:00 Chicago C%sT 1936 Mar 1 2:00 -5:00 - EST 1936 Nov 15 2:00 -6:00 Chicago C%sT 1942 -6:00 US C%sT 1946 -6:00 Chicago C%sT 1956 -6:00 Wisconsin C%sT 1973 -6:00 US C%sT 1975 -6:00 Wisconsin C%sT

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DST in Philippines 1990 etc.
by Jesper Norgaard Welen April 27, 2006

April 27, 2006

I saw an article about the plans for implementing DST in Philippines, that claims that Philippines had DST last time in 1990: http://story.philippinetimes.com/p.x/ct/9/id/145be20cc6b121c0/cid/3e5bbccc73 0d258c/ Also, regarding the upcoming Nicaragua DST, there is an article that specifies the date and time it will start, while not being specific about when it will end: http://www.elnuevodiario.com.ni/2006/04/26/nacionales/18036 It claims that DST will start 2006-04-30 at 2:00, and will last until the end of august (without being more specific). Jesper Nørgaard Welen Email: jnorgard(a)Prodigy.Net.mx Project Leader (Líder de Proyecto) Software CIMMYT - Centro Internacional de Mejoramiento de Maíz y Trigo Dirección: CIMMYT Int. c/o Jesper Nørgaard Km. 45, Carretera México-Veracruz El Batán Texcoco, Edo. de México CP 56130 MEXICO Tel.: +52 (55) 58-04-20-04 ext. 1374 Fax: +52 (55) 58-04-75-58 Tel. Casa: 53-10-05-95 ó 53-10-97-78 Download the free program World Time Explorer, I made: http://www.worldtimeexplorer.com/index.html

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