In BC, most of us will lose an hour of sleep as we adjust for Daylight Savings Time, but not everyone…

“… Chetwynd, Dawson Creek, Hudson’s Hope, Fort St. John, Taylor and Tumbler Ridge are on Mountain Time and do not observe DST. This means that their clocks are the same as those in Edmonton in the winter and the same as Vancouver in the summer.”

“… also Cranbrook, Fernie, Golden and Invermere are on Mountain Time and observes DST, so they are always on the same time as Calgary. One exception: Creston, is the same time as Calgary in the winter, and Vancouver in the summer.” (Source: wikipedia)

In Canada, Saskatchewan never changes…

“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…” (Source: wikipedia)

As far as the rest of the world…

BLUE=DST is used.
ORANGE=DST is no longer used.
RED= DST has never been used.