To avoid possible confusion due to time zones and daylight saving time when reporting the occurance of earthquakes, the times of all earthquakes are recorded in a common standard - Coordinated Universal Time (UTC). This is the modern equivalent of Greenwich Mean Time. To determine the local time that an earthquake occurred, use the following tables to subtract the appropriate number of hours from the UTC time to your time zone.
Time Zones & Daylight Saving Time National Research Council of Canada
Winter (Standard) Time Zones - first Sunday in November to second Sunday in March
| Pacific Standard Time | Mountain Standard Time | Central Standard Time | Eastern Standard Time | Atlantic Standard Time | Newfoundland Standard Time |
|---|---|---|---|---|---|
| UTC - 8 hours | UTC - 7 hours | UTC - 6 hours | UTC - 5 hours | UTC - 4 hours | UTC - 3 hours 30min |
| 12:00 UTC is 04:00 PST | 12:00 UTC is 05:00 MST | 12:00 UTC is 06:00 CST | 12:00 UTC is 07:00 EST | 12:00 UTC is 08:00 AST | 12:00 UTC is 08:30 NST |
Summer (Daylight Saving) Time Zones -Starting in March 2007, the standard North American period for Daylight Saving Time is to be from the second Sunday of March to the first Sunday of November.
This standard will replace the previous practice (from 1987 to 2006, DST was from the first Sunday of April to the last Sunday in October).
| Pacific Daylight Time | Mountain Daylight Time | Central Daylight Time | Eastern Daylight Time | Atlantic Daylight Time | Newfoundland Daylight Time |
|---|---|---|---|---|---|
| UTC - 7 hours | UTC - 6 hours | UTC - 5 hours | UTC - 4 hours | UTC - 3 hours | UTC - 2 hours 30min |
| 12:00 UTC is 05:00 PDT | 12:00 UTC is 06:00 MDT | 12:00 UTC is 07:00 CDT | 12:00 UTC is 08:00 EDT | 12:00 UTC is 09:00 ADT | 12:00 UTC is 09:30 NDT |
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