Daylight saving time in the U.S. begins March 9, 2025. The practice of changing the clock started over 100 years ago in the United States, but many Americans don't like it or understand it, and some simply don't observe it.

It wasn't until the passing of the Uniform Time Act of 1966 that daylight saving became permanent, which established time zones across the country. The act stated that clocks would advance by one hour at 2 a.m. on the last Sunday in April and turn back one hour at 2 a.m. on the last Sunday of October.