| Daylight Saving Time started | When local standard time is about to reach Midnight between Monday, November 1, 2004 and Tuesday, November 2, 2004 clocks are turned forward 1 hour to Tuesday, November 2, 2004 at 1:00:00 AM local daylight time instead Seconds before and after the change:
| Local time | DST? | UTC offset | Zone name |
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| Monday, November 1, 2004 at 11:59:57 PM | No | -4 hours | AMT | | Monday, November 1, 2004 at 11:59:58 PM | No | -4 hours | AMT | | Monday, November 1, 2004 at 11:59:59 PM | No | -4 hours | AMT | | Tuesday, November 2, 2004 at 1:00:00 AM | 1 hour | -3 hours | AMST | | Tuesday, November 2, 2004 at 1:00:01 AM | 1 hour | -3 hours | AMST | | Tuesday, November 2, 2004 at 1:00:02 AM | 1 hour | -3 hours | AMST |
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