Daylight saving time​ in 2025, when clocks change by an hour, has started. Here's a look at when exactly we "spring forward."

The clocks in most U.S. states jumped ahead by an hour over the weekend with the return of daylight saving time, meaning millions of people lost an hour of sleep. The time change will remain until November when standard time returns.

The practice of daylight saving time spans over a century of U.S. law. Here's who started it and why we observe the time change.