eau at astsun.fujitsu.com.au
Tue Nov 10 20:48:08 UTC 1998
From: Michael S. Klein <mklein at alumni.caltech.edu>
>> > Does anyone out there know how timezones work, in detail?
>> > more elusive. Is everyone's local time always an integral number of
>> > offset from Greenwich, or can it be more complicated?
> [various responces indicating 1/2 hour & 1/4 hour offsets]
>Worse still... There are zones whose legal definition of time was solar,
>although, I beleive there are no such current zones. To do timezones
>right, you need to handle historical changes.
Saudi Arabia still uses solar time, I believe. But like leap seconds, this
is too fiddly to worry about. The easy thing is just to use GMT and h:m:s
offsets dependent upon location and date.
There are also "future historical" changes - expected changes in time zone
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