US Time Zones
Daylight Saving Time (DST) in the USA starts on the 2nd Sunday in March and ends on the 1st Sunday in November. In 2021 Daylight Savings Time begins on March 14 and ends on November 7.
On March 14 clocks are set ahead one hour at 2:00 a.m. local standard time, which becomes 3:00 a.m. local daylight time. On November 7 clocks are set back one hour at 2:00 a.m. local daylight time, which becomes 1:00 a.m. local standard time.
Not all places in the U.S. observe Daylight Savings Time (such as Arizona and Hawaii).
Learn more about the history and purpose of daylight savings time.