Clocks not changed but standard time zone is changed | When local daylight time is about to reach Midnight between Thursday, March 2, 2000 and Friday, March 3, 2000 the standard time zone offset is changed from UTC/GMT -4 hours to UTC/GMT -3 hours and at the same time daylight saving time ended Seconds before and after the change:
| Local time | DST? | UTC offset | Zone name |
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| Thursday, March 2, 2000 at 11:59:57 PM | 1 hour | -3 hours | ARST | | Thursday, March 2, 2000 at 11:59:58 PM | 1 hour | -3 hours | ARST | | Thursday, March 2, 2000 at 11:59:59 PM | 1 hour | -3 hours | ARST | | Midnight between Thursday, March 2, 2000 and Friday, March 3, 2000 | No | -3 hours | ART | | Friday, March 3, 2000 at 12:00:01 AM | No | -3 hours | ART | | Friday, March 3, 2000 at 12:00:02 AM | No | -3 hours | ART |
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