Hal Mueller wrote:
> There are places that are fractions of an hour ahead or behind.
> Northern and southern hemispheres switch in different directions at
> not quite similar times of year. There are pockets of time zones
> that don't observe DST at all.
Strictly within the United States, it's much simpler. For any place in
the U.S. there are only two choices: it has DST according to the federal
rules, or it does not have DST at all. The (current) federal rules are:
DST starts at 2:00am (local standard time) on the first Sunday in April,
and ends at 2:00am (local DST) on the last Sunday in October.
--Mark
