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From: dgary@ecsvax.UUCP (D Gary Grady)
Newsgroups: net.micro.mac
Subject: Re: Daylight Savings Time vs. Macintosh
Message-ID: <1231@ecsvax.UUCP>
Date: Fri, 10-May-85 17:22:56 EDT
Article-I.D.: ecsvax.1231
Posted: Fri May 10 17:22:56 1985
Date-Received: Mon, 13-May-85 23:47:11 EDT
References: <622@utcs.UUCP>, <544@wanginst.UUCP>
Organization: Duke U Comp Ctr
Lines: 34

> Many areas in the U.S. are not on standard daylight savings time (pardon
> my oxymoron); some do not use daylight savings time at all.  Will you add
> controls to the control panel for describing the local dst rules?  Or will
> the Mac simply ask where you live?

To the best of my knowledge, areas in the US either use national DST
rules or they stay on standard time.  Hawaii, Arizona, Puerto Rico, the
Virgin Islands, American Samoa, and part of Indiana stay on standard
time year round.  The islands are at such low latitudes that there is
relatively little change in daylight length year round.  Indiana uses
its split-zone approach so that the whole state is effectively in one
time zone during the summer months.  Arizona uses standard time year
round just to be ornery, and if you think I'm kidding you haven't spent
much time in Arizona.

European summer time rules are far more complicated, and it annoys the
dickens out of me that this information is hard to come by for
travelers.  (I once spent four days in Scotland with my watch set an
hour off and nearly missed a flight out of Glasgow as a consequence.
The only reason I didn't is that Icelandic Airlines actually came
looking for me in the airport lounge, bless 'em!!)

It would probably be possible to handle all current rules with four
entries, each recording a date and time to change and the amount to
change by.  I think a few countries have a two-step daylight savings
time system, with a different time in effect for each of the four
seasons (spring and fall being the same).  Seems not unreasonable, and I
seem to recall at least some Unix versions use something along these
lines...
-- 
D Gary Grady
Duke U Comp Center, Durham, NC  27706
(919) 684-3695
USENET:  {seismo,decvax,ihnp4,akgua,etc.}!mcnc!ecsvax!dgary