Amebr
says:
For US east coast (New York), take off 2 hours from the current time and make it the other side of the day. So if it's 10pm here, it'a 8am there.
For US west coast (LA), take off 5 hours. 10pm = 5am.
I haven't worked out what happens when we go to summer time yet. 
07/17/2007
Melbourne