Get ready to tinker with time.
Daylight time officially begins at 2 a.m. Sunday, when clocks are cranked ahead one hour to 3 a.m.
Known as the time of year most parts of the world "spring ahead," the change means an hour of lost sleep but more daylight into the evening.
Saskatchewan is the only Canadian province that doesn't move its clocks. South of the international border, just two U.S. states — Arizona and Hawaii — and three U.S. territories — American Samoa, Puerto Rico and the U.S. Virgin Islands — do not participate.
Daylight time continues until the first Sunday in November, when it will be time again to fall back one hour.
Traditionally, the clocks changed on the first Sunday in April, but in 2007 legislation in the United States moved the start of daylight time three weeks earlier in the spring and the return to standard time a week later in the fall.
The change, which was followed by Canada and most other jurisdictions in the world, was aimed at trying to help save energy, since people aren't expected to need their lights on as early in the evening.
Idea raised more than 100 years ago

Daylight time was first proposed in 1907 by the English builder William Willett, who felt the evenings would offer more daylight for recreation and also reduce lighting costs.
The outbreak of the First World War made the issue more important, primarily because of the need to save coal. The bill providing for the change was finally passed in Britain on March 17, 1916, but Willett did not live to see the day. He died in 1915.
The early morning hour to change the clocks was decided as ideal because it minimized disruption. Most people were at home and this was the time when the fewest trains were running.