In less than a week, the clocks will once again spring forward an hour, marking the start of Daylight Saving Time in 2025.

Daylight saving time is the period between the second Sunday of March and the first Sunday of November when clocks for most states in the U.S. shift back for one hour.

Daylight saving time is set to start in a few days. See why most of the U.S. observes it and when it starts and ends in California.