EDWARDS AIR FORCE BASE, Calif. -- Daylight saving time begins March 12. Make sure to set your clocks ahead one hour at 2 a.m. This gives people one more hour of daylight in the evening.
Beginning in 2007, Congress established that daylight saving time begins on the second Sunday in March and ends on the first Sunday in November. Before then, daylight saving time dates have varied as Congress passed new statutes several times since the Act of March 19, 1918, sometimes called the Standard Time Act. The act also established daylight saving time, a contentious idea then.
Not all places in the United States observe daylight saving time. In particular, Hawaii and most of Arizona do not.