"Kevin Grittner" <kevin.gritt...@wicourts.gov> writes:
> Tom Lane <t...@sss.pgh.pa.us> wrote:
>> It's not all that separate: per the Olsen database,
>> 
>> Link America/Denver          US/Mountain
>> Link America/Denver          Navajo
 
> Yeah, it gets complicated, since the State of Arizona ignores
> Daylight Saving Time adjustments.  On the other hand, most of
> Arizona is covered by the Navajo Nation, which *does* observe DST. 
> Except for some government offices on the reservation.  And the Hopi
> Nation goes along with the local state rules, so pay attention.  :-/
 
> So, yeah, Navajo is always the same as most of US/Mountain, but the
> parts in Arizona don't ignore DST like the rest of the state does.

Well, the Arizona rules are described by the America/Phoenix zone,
which we *can* tell apart from America/Denver because there's an
actual behavioral difference.  If the user wanted Arizona rules
and selected US/Mountain, that's their mistake not ours.

                        regards, tom lane

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