Daylight saving correction
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From: Dr J R Stockton on 16 Mar 2010 09:24 In comp.lang.java.programmer message <i53qp5dnm4ro53afcfkqvbgqr7kl9g4dea @4ax.com>, Sun, 14 Mar 2010 09:22:18, Roedy Green <see_website(a)mindprod. com.invalid> posted: >Your computer should have automatically set your PC clock ahead 1 hour >at 2AM this morning. Codswallop and balderdash. The proper date for that is the last Sunday in March and the proper time is 01:00 UTC (or GMT), which all Canadians should realise. The proper date to change back is the last Sunday in October, at the same UTC. Except, of course, for those in the Southern Hemisphere. Both except those near the Equator, in Iceland, or on the ISS - etc. -- (c) John Stockton, nr London, UK. ?@merlyn.demon.co.uk Turnpike v6.05. Web <URL:http://www.merlyn.demon.co.uk/> - w. FAQish topics, links, acronyms PAS EXE etc : <URL:http://www.merlyn.demon.co.uk/programs/> - see 00index.htm Dates - miscdate.htm estrdate.htm js-dates.htm pas-time.htm critdate.htm etc.
From: Joshua Cranmer on 16 Mar 2010 20:33 On 03/14/2010 12:22 PM, Roedy Green wrote: > Your computer should have automatically set your PC clock ahead 1 hour > at 2AM this morning. If you want to check that it worked ok, and if > not correct the problem and resynch your clock with an atomic source, > see > > http://mindprod.com/webstart/setclock.html Only if you are part of the ~5% of the world population who lives in parts of North America and the Caribbean islands. A more complete (but not fully correct) chart, taken courtesy of another newsgroup that requires coordination between people from many different countries (most notably U.S., Canada, a variety of European countries, New Zealand, Japan, among others): Sunday, February 21: -1 hour: South, Southeast, and Central-West Brazil (GO, DF, MG, ES, RJ, SP, PR, SC, RS, MS, MT) Sunday, March 14: +1 hour: Canada (except Saskatchewan (excluding western parts that are in Mountain Time) and the areas around Resolute (NU), Atikokan (ON) and Southampton Island (NU), Blanc-Sablon (PQ), and Dawson Creek and Fort Saint John (BC)) United States (except Hawaii and most (non-Navajo areas) of Arizona) parts of Mexico near US border (except Sonora) Bahamas Bermuda Cuba Turks & Caicos Islands St. Pierre & Miquelon Thule area (Greenland) -1 hour: Uruguay San Luis area (Argentina) Palmer Station (Antarctica) Monday, March 22: +1 hour: Iran Friday, March 26: +1 hour: Jordan, Syria, Israel, Palestinian Territories Sunday, March 28: +1 hour: all of Europe (except Iceland and Georgia), including: all of Russia (except Novokuznetsk area) all of Turkey Armenia Azerbaijan Cyprus Faroe Islands Tunisia Lebanon most of Greenland (except Thule and Danmarkshavn areas) -1 hour: Samoa Fiji Thursday, April 1: +1 hour: Bangladesh Sunday, April 4: -1 hour: much of Australia (Victoria, NSW, Tasmania, SA, ACT?) New Zealand Namibia Chile McMurdo and Amundsen-Scott Stations (Antarctica) -0.5 hours: Lord Howe Island (Australia) +1 hour: Mexico (except Sonora and parts near US border) Sunday, April 11: -1 hour: Paraguay Thursday, April 15: +1 hour: Pakistan Sunday, April 18: -1 hour: Falkland Islands Friday, April 30: +1 hour: Egypt On second thought, don't bother posting DST correction announcements. The newsgroup would be flooded throughout late March and April, as well as a similar timeframe near the other equinox. -- Beware of bugs in the above code; I have only proved it correct, not tried it. -- Donald E. Knuth
From: Roedy Green on 17 Mar 2010 01:43 On Mon, 15 Mar 2010 09:54:17 +0000, bugbear <bugbear(a)trim_papermule.co.uk_trim> wrote, quoted or indirectly quoted someone who said : >> Your computer should have automatically set your PC clock ahead 1 hour >> at 2AM this morning. > >No it shouldn't! I presume by that you mean the UTC time should not have shifted, just the displayed local time? Or that this only applies to Canada and the USA? -- Roedy Green Canadian Mind Products http://mindprod.com Responsible Development is the style of development I aspire to now. It can be summarized by answering the question, �How would I develop if it were my money?� I�m amazed how many theoretical arguments evaporate when faced with this question. ~ Kent Beck (born: 1961 age: 49) , evangelist for extreme programming.
From: Roedy Green on 17 Mar 2010 01:49 On Tue, 16 Mar 2010 13:24:12 +0000, Dr J R Stockton <reply1011(a)merlyn.demon.co.uk> wrote, quoted or indirectly quoted someone who said : >Codswallop and balderdash. The proper date for that is the last Sunday >in March and the proper time is 01:00 UTC (or GMT), which all Canadians >should realise. The proper date to change back is the last Sunday in >October, at the same UTC. Not any more. Remember Mr. Bush extended the range of DST. The 2:00 AM local time rule is what I learned as a young child, and in general that is when public clocks change in my part of the world. What is your source for 1:00 UTC? -- Roedy Green Canadian Mind Products http://mindprod.com Responsible Development is the style of development I aspire to now. It can be summarized by answering the question, �How would I develop if it were my money?� I�m amazed how many theoretical arguments evaporate when faced with this question. ~ Kent Beck (born: 1961 age: 49) , evangelist for extreme programming.
From: Roedy Green on 17 Mar 2010 01:52
On Tue, 16 Mar 2010 13:24:12 +0000, Dr J R Stockton <reply1011(a)merlyn.demon.co.uk> wrote, quoted or indirectly quoted someone who said : > >Codswallop and balderdash. The proper date for that is the last Sunday >in March and the proper time is 01:00 UTC (or GMT), which all Canadians >should realise. The proper date to change back is the last Sunday in >October, at the same UTC. according to TimeZone.inDaylightTime, for PST, the shift happened 2010-03-14. -- Roedy Green Canadian Mind Products http://mindprod.com Responsible Development is the style of development I aspire to now. It can be summarized by answering the question, �How would I develop if it were my money?� I�m amazed how many theoretical arguments evaporate when faced with this question. ~ Kent Beck (born: 1961 age: 49) , evangelist for extreme programming. |