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Daylight-Saving Time is not in effect.

The Eastern part of Ontario falls in the Eastern Time Zone, which is 5 hours behind Greenwich Mean Time (GMT-5) and the Western part of Ontario, west of 90° W longitude, are in the Central Time zone, which is 6 hours behind Greenwich Mean time (GMT-6).

Like most provinces in Canada, Daylight Saving Time is observed in Ontario, where the time is shifted forward by 1 hour, resulting in a 4 hours (GMT-4) and 5 hours (GMT-5) difference behind GMT for the Eastern and Western part of Ontario respectively.

After the Summer months the time is shifted back by 1 hour resulting in the normal time difference behind GMT.

Daylight Saving Time starts on 3/11/2012 2:00:00 AM local standard time.
Daylight Saving Time ends on 11/4/2012 3:00:00 AM local daylight time.