Date: Wed, 10 Apr 2002 11:36:09 -0230 From: Paul David Fardy <pdfardy@mac.com> To: Matthias Andree <ma@dt.e-technik.uni-dortmund.de> Cc: freebsd-stable@FreeBSD.ORG Subject: Re: DST vs. Cron = Burp Message-ID: <1B3F8146-4C8C-11D6-81AA-0003938656E6@mac.com> In-Reply-To: <m3n0wbnab4.fsf@merlin.emma.line.org>
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On Wednesday, April 10, 2002, at 07:29 AM, Matthias Andree wrote: > "Brandon S. Allbery KF8NH" <allbery@ece.cmu.edu> writes: >>> Since in most places the changeover to DST occurs at 0100, that >> >> In the U.S. it happens at 0200. > > Is there any country which switches from standard to daylight savings > time at a different time than 02:00 (ante meridies, for those expecting > 12-hour display)? In North America, Daylight Savings Time is regulated regionally, by state or province and occasionally cities/counties opt out. e.g. Indiana, see http://www.mccsc.edu/time.html. Here in Newfoundland, we shift at 12:01 am! That's fine for NST -> NDT, but the reverse: $ export TZ=:America/St_Johns $ perl -le 'for $i (-1..7) { print scalar localtime(1035685800 + $i * 10) }' Sat Oct 26 23:59:50 2002 Sun Oct 27 00:00:00 2002 Sun Oct 27 00:00:10 2002 Sun Oct 27 00:00:20 2002 Sun Oct 27 00:00:30 2002 Sun Oct 27 00:00:40 2002 Sun Oct 27 00:00:50 2002 Sat Oct 26 23:01:00 2002 Sat Oct 26 23:01:10 2002 It's October 27 for a minute, then it goes back to October 26 for another hour. It's actually possible--though *extremely* unlikely--that a younger twin will have his or her birthday first! :-) In 1988, we tried Double Daylight Savings (NDDT) and shifted by 2 hours. That's was great for a single college student[1], but it sucked for parents trying to put children to bed two hours before sunset. I wonder why we didn't switch to 2 am while we were revisiting the rules... I believe at least one community refused to observe DDT. BTW, BSD's zoneinfo is correct; Tru64 shifts at 2am. But since most people don't know the correct rules, I'm not sure which is POLA violation. Paul -- [1] Yeah, every other college student hated it! :-) For our ENL[2] readers, by "single", I mean independent. (Why didn't I say that?) [2] ENL: English as an Nth language. To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-stable" in the body of the message
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