In 2007 if you insert a text box (believed this worked in earlier versions
also), click on Insert, Date & Time, select what you want form the drop down
list, checkmark update automatically, it will show the date and time from
whichever time zone is viewing the presentation. It takes the time from the
computer viewing the presentation.
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Michael Koerner
MS MVP - PowerPoint
Thanks for that, worked great on 2003, not at all on 2007, but didn't solve
my problem: I need to insert into a slide the time in a time zone other than
that on the computer clock (and keep the computer on local time).