Daylight saving time occurs between March and November, when most Americans adjust their clocks ahead by one hour.

The Standard Time Act in 1918 was the first introduction of daylight saving time to American clocks. What was then a temporary measure, held the nickname 'war time,' and lasted from spring to fall in an attempt to cut energy costs during World War I. The act is also responsible for the five time zones still in place today.

Clocks will "spring forward" one hour at 2 a.m. on Sunday, March 9, 2025, causing most people to lose an hour of sleep. It won't be until Nov. 2, the first Sunday of November, when Americans fiddle with their clocks again to " fall back" to standard time.