EST to GMT/UTC

I need to convert a field called CALL_TIMSTAMP from Eastern Standard Time to MM/DD/YYYY HH24:MM:SS in GMT or UTC.
I was wondering if there is a snippet of code out there, perhaps with a case statement, which identifies whether or not the date is of the current/past year's daylight savings time and takes that into account when pulling the data.
Edited by: Morrison on May 13, 2010 10:19 PM

SQL> select  systimestamp est,
  2          systimestamp at time zone'UTC' utc
  3    from  dual
  4  /
EST                                      UTC
13-MAY-10 04.28.43.572000 PM -04:00      13-MAY-10 08.28.43.572000 PM UTC
SQL> SY.

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