The United States observes Daylight Saving Time (DST) from the second Sunday in March to the first Sunday in November. In 2026, clocks spring forward on March 8 and fall back on November 1.
Arizona (except the Navajo Nation) and Hawaii do not observe Daylight Saving Time. US territories including Puerto Rico, Guam, the US Virgin Islands, American Samoa, and the Northern Mariana Islands also do not change their clocks.
During DST (March 8 – November 1), US time zones shift forward by 1 hour: EST → EDT (UTC-4), CST → CDT (UTC-5), MST → MDT (UTC-6), PST → PDT (UTC-7). When DST ends on November 1, clocks return to standard time.
The Sunshine Protection Act, which would make DST permanent in the US, has been introduced in Congress multiple times but has not been enacted into law as of 2026. The US continues to observe seasonal clock changes.
The US first adopted DST during World War I to conserve energy. It was standardized nationally by the Uniform Time Act of 1966. The Energy Policy Act of 2005 extended DST to its current March–November schedule, effective 2007.