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mysql> SELECT CONVERT_TZ('2012-06-07 12:00:00', 'GMT', 'America/New_York');
+--------------------------------------------------------------+
| CONVERT_TZ('2012-06-07 12:00:00', 'GMT', 'America/New_York') |
+--------------------------------------------------------------+
| 2012-06-07 08:00:00                                          |
+--------------------------------------------------------------+
1 row in set (0.00 sec)