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Daylight saving time (DST) is now observed in all Canadian provinces,〔National Research Council http://www.nrc-cnrc.gc.ca/eng/services/time/time_zones.html〕 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. ==History== Five Canadian cities, by local ordinance, used Daylight Saving Time before 1918: Brandon, Manitoba and Winnipeg, Manitoba (already in 1916)〔(Doris Chase Doane, ''Time Changes in Canada and Mexico'', 2nd edition, Professional Astrologers, Inc., 1972 - 1975, p. 9, 23 )〕 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: * Ontario, Manitoba - October 20, 2005 * Quebec - December 5, 2005 * Prince Edward Island - December 6, 2005 * New Brunswick - December 23, 2005 * Alberta - February 2, 2006 * Northwest Territories - March 4, 2006 * British Columbia - March 31, 2006 * Nova Scotia - April 25, 2006 * Yukon - July 14, 2006 * Newfoundland - November 20, 2006, but officially announced on January 18, 2007 * Nunavut - February 19, 2007〔(Nunavut News/North "Nunavut to follow new seasonal time standard" (unofficial, cached version) )〕 * Saskatchewan - ''no official action taken, as most of the province does not change their clocks back in winter, but the small parts that have historically observed 'DST' near Alberta and Manitoba are presumed to be authorized to have the start and end dates the same as Alberta and Manitoba.'' 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Daylight saving time in Canada」の詳細全文を読む スポンサード リンク
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