| Daylight Saving Time started | When local standard time is about to reach Midnight between Saturday, September 18, 2004 and Sunday, September 19, 2004 clocks are turned forward 1 hour to Sunday, September 19, 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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| Saturday, September 18, 2004 at 11:59:57 PM | No | -3 hours | UYT | | Saturday, September 18, 2004 at 11:59:58 PM | No | -3 hours | UYT | | Saturday, September 18, 2004 at 11:59:59 PM | No | -3 hours | UYT | | Sunday, September 19, 2004 at 1:00:00 AM | 1 hour | -2 hours | UYST | | Sunday, September 19, 2004 at 1:00:01 AM | 1 hour | -2 hours | UYST | | Sunday, September 19, 2004 at 1:00:02 AM | 1 hour | -2 hours | UYST |
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