Daylight Saving Time (DST), or summer time ends on Sunday, November 1, 2015 at 2:00 a.m. Clocks are set back one hour. The changes will affect many cities in Canada. The main purpose of Daylight Saving Time is to save energy and make better use of the natural daylight. It was first put into practice by the German government in 1916. Before 1918, five Canadian cities used Daylight Saving Time [Wikipedia]. In Canada, Daylight Saving Time usually has been regulated by the provincial and territorial governments.