Calculating daylight saving time automatically

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Hi guys,

I have to make a event signup page for our company that would display
the event time/date in 3 different time zones (Eastern - New York,
Central - Chicago, and Pacific - San Francisco). To do this. I convert
the inputed date from local time zone and convert it into UTC and store
it in the database (correct me if I'm wrong please). Next to display it
I would add the correct time zone difference value (-5 for Eastern).
How to do I handle the daylight saving time though? For example the -5
Eastern time is right now -4. Is there a way to do this automatically?
Any samples would be greatly appreciated.


Thanks
M.

.

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