South Australia fools around with it's timezone again
Just when I thought the politicians had got some sort of system into our magic roundabout of a timezone they play about with it again! It appears that even though there is no Adelaide Festival next year we are ending daylight saving on March 26 (ie we are using the even year rule in an odd year). Apparently we are doing this to stay in line with Victoria and Tasmania so maybe this is for Moomba or something. NSW and ACT are finishing daylight saving as usual on March 5. At least they haven't played with the start of daylight saving which is still the last Sunday in October. So next year's rule is Rule AS 1995 only - Mar 26 2:00 0 - Mark.
Date: Mon, 19 Sep 1994 12:17:09 +0930 From: Mark Prior <mrp@itd.adelaide.edu.au> Message-ID: <9409190247.AA17698@jarrah.itd.adelaide.edu.au> It appears that even though there is no Adelaide Festival next year we are ending daylight saving on March 26 (ie we are using the even year rule in an odd year). My guess is that this will now be the permanent end date, with no odd/even year stuff. Apparently we are doing this to stay in line with Victoria and Tasmania so maybe this is for Moomba or something No, there was (in the eastern states anyway) a big rucus earlier this year aboth extending DST, and attemptint to get all of the DST states onto the same rules (note that Tas ran longer than Vic SA (etc) before). NSW and ACT are finishing daylight saving as usual on March 5. NSW decided not to go along with the other states - though some concession was made - originally the plan was to move the start date as well (to early Oct), and if NSW persist in not changing at all, that may happen in the other states next year. ACT obviously just goes along with NSW, anything else would be silly. So next year's rule is Rule AS 1995 only - Mar 26 2:00 0 - I suspect that you're going to want 1995 -> forever ("forever" being until they decide to change it again of course). Ie: if no further changes are made, 97 should be the same, etc. I had been intending to send a emssage about this for some time, but wanted to check the details first - which I still haven't done - eg: I don't know if Mar 26 is the 4th Sunday, the last Sunday (next year its both of those) or something else. The Vic & Tas rules will need adjusting as well. At least all three should (in theory) become the same now. Once I get a chance to find out what te rules really should become, I will send a message (to the tz list). kre
Date: Mon, 19 Sep 1994 12:17:09 +0930 From: Mark Prior <mrp@itd.adelaide.edu.au> Rule AS 1995 only - Mar 26 2:00 0 - Is that `2:00' or `3:00'? According to the latest tz tables, since 1945 every Australian jurisdiction has used 3:00 for the fall switchover if it used DST at all. However, Shanks (1991) gives 2:00 for all the switchovers. When I incorporated Shanks's data, I went with the tz tables, but it'd be nice to check this. Date: Mon, 19 Sep 1994 18:43:57 +1000 From: Robert Elz <kre@munnari.OZ.AU> I don't know if Mar 26 is the 4th Sunday, the last Sunday (next year its both of those) or something else. Judging from the past, it's probably the last Sunday; as far as I know no Australian jurisdiction has ever used a 4th-Sunday rule. We'll find out in 1996, if they don't change the rules again before then. The Vic & Tas rules will need adjusting as well. At least all three should (in theory) become the same now. If my guesses are right, this won't change Tasmania, just Victoria. ACT obviously just goes along with NSW, anything else would be silly. While I was looking into this, I noticed Shanks says that precisely that silliness occurred in fall 1982, causing an error in the tz data for 1982 Sydney (since had I copied the Canberra data, assuming Sydney and Canberra were the same). I'll incorporate a fix into my next proposed patch.
Is that `2:00' or `3:00'? According to the latest tz tables, since 1945 every Australian jurisdiction has used 3:00 for the fall switchover if it used DST at all. However, Shanks (1991) gives 2:00 for all the switchovers. When I incorporated Shanks's data, I went with the tz tables, but it'd be nice to check this. I was just going along with what the newspaper said but we all know how reliable they are! :-) I don't know if Mar 26 is the 4th Sunday, the last Sunday (next year its both of those) or something else. Judging from the past, it's probably the last Sunday; as far as I know no Australian jurisdiction has ever used a 4th-Sunday rule. We'll find out in 1996, if they don't change the rules again before then. If I get the chance I will wander up to the Law School library and check the government bulletins although I expect even if they do have some idea what they are doing more than a year ahead the bulletin will only proclaim that daylight saving finishes on the 26th of March 1995. Unfortunately these chances only ever seem to be made by proclamation rather than amendments to the act. Mark.
Why am I reveiving all this mail regarding Daylight Saving. It's interisting but not productive for me, if I do need to know please advise as to WHY. It appears you have some sort of redirection/distribution to moe. Is this necessary ro am I as is often the case, missing the point. Regards, Andrew.
Date: 19 Sep 1994 10:15:05 -0700 From: eggert@twinsun.com (Paul Eggert) Message-ID: <9409191715.AA28923@spot.twinsun.com> Date: Mon, 19 Sep 1994 12:17:09 +0930 From: Mark Prior <mrp@itd.adelaide.edu.au> Rule AS 1995 only - Mar 26 2:00 0 - Is that `2:00' or `3:00'? According to the latest tz tables, since 1945 every Australian jurisdiction has used 3:00 for the fall switchover if it used DST at all. It would be the autumn switchover, we don't have a "fall"... (what's more, almost no, if any, Australian flora is actually deciduous, so its not just a difference in terminology... Nothing native falls in autumn except rain & the temperature!) More seriously, it is, and always has been 02:00 when the switchover occurs, its just that it's 02:00 standard time, not 02:00 wallclock time (so its 03:00 summer time that reverts to 02:00 standard time). In the tz files, that's written as 03:00. At least, that is very explicitly what is in the Victorian legislation, I can't really imagine that its different in the other states, but I can imagine that the legislators don't really think it matters what happens around 02:00 on a Sunday morning, and could have done anything at all. This is also true (to my knowledge) only with respect to the current series of DST (since about 1970) - what happened back in the 40's, or whenever DST previously applied, I have absolutely no idea whatever, it could have been either way. kre ps: to those "unix-admins" at Adelaide Univ who have no idea why they're getting this mail ... nor do I, Mark just included you on the first message. However you are probably going to have to edit your timezone files sometime between now and next Morch. So are all the rest of us.
participants (4)
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Andrew Trotter. Buildings Branch. Ph. 303 4247 -
eggert＠twinsun.com -
Mark Prior -
Robert Elz