Your clock may need to receive a signal indicating the time change. You can try moving it to another room, or outside to see if it reads the signal. Mine didn't, so I removed the battery and reset the clock. It wasn't obvious how to do that and I didn't save the owner's manual but upon close inspection there was a tiny black button (that looks like where you would lift a cover for a battery) and pressing it allowed me to adjust to the correct time. It is a "Sharp" bought at Target a couple of years ago.