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Time Zones in Canada

There are six time zones in Canada covering four and a half hours. From west to east these time zones are: Pacific, Mountain, Central, Eastern, Atlantic and Newfoundland. From the first Sunday in November to the second Sunday in March these zones are referred to as standard time zones, and may be abbreviated as PST, MST, CST, etc. From the second Sunday in March to the first Sunday in November most of Canada follows daylight saving time. During this summer period the time zones may be abbreviated as PDT, MDT, CDT, etc. The boundaries of the standard time zones are not necessarily the same as those of the corresponding daylight saving time zones. For example, the Mountain time zone includes a portion of northeastern British Columbia in the summer, but not during the winter (see maps below). Boundaries shift because some municipalities choose not to participate in daylight saving time. Similarly, Saskatchewan follows CST year-round.