Daylight saving time is set to start in less than a week. See why most of the U.S. observes it and when it starts and ends.

There are several sure indications that another cold winter is coming to a close and spring is on the way. Weeks before the spring equinox arrives on March 20, the air starts getting warmer, days become longer and there are new signs of life in plants and animals.

March signals the return of daylight saving time, a practice that has been debated for over a century. On March 9, 5, we “spring ahead”