Daylight saving time in Canada

Daylight saving time (DST) is now observed in all Canadian provinces, with the exception of most of Saskatchewan, which observes Central Standard Time year-round even though it is in the Mountain Zone, effectively putting it on DST year round. Under the Canadian Constitution, laws related to timekeeping are a purely provincial matter.

In regions where daylight-saving time is used, it commences on the second Sunday of March, and standard time restarts on the first Sunday in November.

Five Canadian cities, by local ordinance, used Daylight Saving Time before 1918: Brandon, Manitoba and Winnipeg, Manitoba (already in 1916) as well as Halifax, Nova Scotia, Hamilton, Ontario, and Montreal, Quebec. St. John's, Newfoundland (now Newfoundland and Labrador), which did not become part of Canada until 1949, also used DST before 1918.

In practice, since the late 1960s DST across Canada has been closely or completely synchronized with its observance in the United States to promote consistent economic and social interaction. When the United States extended DST in 1987 to the first Sunday in April, all DST-observing Canadian provinces followed suit to mimic the change.

The latest United States change (Energy Policy Act of 2005), adding parts of March and November starting in 2007, was adopted by the various provinces and territories on the following dates:

Most of British Columbia (BC) is on Pacific Time and observes DST. However, there are two main exceptions:

Part of the Peace River Regional District of BC (including the communities of Chetwynd, Dawson Creek, Hudson's Hope, Fort St. John, Taylor and Tumbler Ridge) is on Mountain Time and does not observe DST. This means that the region's clocks are the same as those in Calgary and Edmonton in the winter, they are the same as those in Vancouver in the summer. The residents of Fort Nelson have voted to also stay on year-round MST since 2015.

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