Daylight Savings Time begins in the spring and ends in the fall. When it begins, we change the time on our clocks one hour ahead. If the clock says 10:00, we change it to 11:00. The time officially changes at 2:00 a.m. on Sunday, March 8, 2015. However, most of us are asleep at 2:00 a.m., so we change our clocks before we go to sleep on Saturday night.
Your cell (mobile) phone will probably change automatically, but you should change the other clocks in your house and car.