Daylight saving time (DST) is a practice of advancing clocks during warmer months so that evenings have more daylight and mornings have less. In the United States, DST begins on the second Sunday of March and ends on the first Sunday of November. In 2025, Daylight Saving Time will begin on March 9th and end on November 2nd.
DST was first introduced in the United States during World War I as a way to conserve energy. It has been shown to have a number of benefits, including reducing traffic accidents, crime, and energy consumption. However, DST can also have some negative effects, such as disrupting sleep patterns and increasing the risk of heart attacks.