British Columbia

Clocks will gradually, almost imperceptibly, speed up. They gain about 12 seconds every hour — edging forward in a manner that may go unnoticed over a day but can add up over time, leaving locals scratching their heads or rushing to their next appointment. After just two days, affected clocks will be 9 1/2 minutes ahead of the actual time.

This happens when BC Hydro switches to an alternate power source during maintenance or unexpected service interruptions caused by things like electrical storms or trees felled by beavers.