datetime compare - eastern and pacific

Hi,
I need to compare two datetime values, one is eastern and anther is pacific. Is there an existing function that I can turn a pacific time to eastern one? or I have to write it by myself?
Thanks,
Liliyou might try using the dateadd function to manipulate the time by +2 hours.|||It works! Thank you.

In case someone wanna know, I used:
SET @.NEWSTART = DATEADD(HH, 3, OLDSTARTTIME)