Today’s the day most of us in the United States switch back from daylight saving time to standard time – giving ourselves a 25-hour day and commanding the sun to rise and set an hour earlier than it did yesterday. When time shifts, remember your body has a clock, too Today’s the day most of us in the United States switch back from daylight saving time to standard time – giving ourselves a 25-hour day and commanding the sun to rise and set an hour earlier than it did yesterday.