Starting at 2 a.m. Sunday roll their clocks back one hour as daylight time ends this year.

Starting at 2 a.m. Sunday, most Canadians will need to roll their clocks back one hour as daylight time ends this year.
Twice a year, we have to fiddle around with our clocks to adhere to daylight time with the goal to adjust our days to the changing amount of daylight as the planet revolves around the sun.

Daylight time begins in the spring during March of every year, as a way for people to make the most of the daylight. This was particularly useful when larger portions of the country’s population were devoted to farming and agriculture and needed more time to plant and harvest crops.
Because you roll your clocks forward in the spring and roll them back in autumn, a common mnemonic device to help people remember what to do is: Spring forward, fall back.

Although wrist watches, some clock radios and car timepieces will need to be tweaked, most digital clocks such as the ones on your phone or computers adjust their clocks automatically. So be sure not to make the mistake of adjusting them twice and check how your devices are programmed.
What places in Canada don’t have daylight time?
Although most of Canada adheres to daylight time, there are plenty of places that don’t, including nearly the entire province of Saskatchewan.
On the West Coast, several places in British Columbia including Creston, Chetwynd, Dawson Creek, Hudson's Hope, Fort Nelson, Peace River Regional District, and Tumbler Ridge all abstain from daylight time.
Then in Ontario, the citizens of Atikokan, Pickle Lake and New Osnaburgh don’t touch their clocks at any point in the year. If you live in Quebec’s north shore, you also avoid the drudgery of clock-tweaking altogether.