If you program in Java and have to convert dates and times between different timezones then you will know that the Date, Calendar & TimeZone objects of the java.util package are the way to go.
The JavaDoc for java.util.TimeZone mentions that you can use a 'time zone ID' of "America/Los_Angeles" to get the US Pacific Time. It doesn't give examples of any other time zone ID, so here is a list of the standard US time zone IDs:
(Table sourced from Statoids: Time Zones of the United States.)
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