I need to convert a date time from EST to PST time. ex: 3/24/2004 09:00:00 -> 3/24/2004 06:00:00 I thought I could just subtract 3 hours and be done but the date could change after subtracting 3 hours from 1AM (01:00:00) and that threw in another problem... Are any classes I that do something similiar to what I need? Any examples would be excellent as well.... Thanks, Dave
I believe if you create a GregorianCalendar object you can specify the timezone that the object will return. Create the object using EST and then change the timezone to PST for the new value.
Well, you don't necessarily have to subtract 3 hours; just set the hours value to 3 less:
I think that should work. The whole mod thing is so if it turns out to be a negative number, we actually want the value set to 24 - value. See if this will work for you. My only other suggestion is the use of java.util.TimeZone and it's methods to compute differences of times between different time zones and UTC; but it seems your non-change-of-day constraint makes some of this a bit akward.
you can represent the EST date object in term of mill seconds then use setTimeInMillis(currentTimeMill - 60*60*3000) to get the PST time. this way, the new date will adjust itself automatically. [ March 25, 2004: Message edited by: chi Lin ]
not so smart guy still curious to learn new stuff every now and then
Actually I need the date to change with the time. If I've got 03/10/2004 01:00:00 EST and when converting to PST I need the date to change if necessary. Example 03/10/2004 01:00:00 EST => 03/09/2004 22:00:00 PST. So which class would be better to use timezone or gregorian calendar?