[bdonlan]

The semantics of "time X at point Y" are different from "time X in time zone Z". Sometimes the former may indeed be what you want, but it's uncommon for the user to be providing precise location information for a point in time far in the future. If you're told "time X, Eastern standard time", then the semantically correct thing to do is to not guess a point in space, but instead preserve the time zone as provided.