
Daylight Saving Time was first observed in the United States on March 19, 1918, during World War I as a way to conserve coal. Although it was halted nationally later that year, it has persisted in some form at local and state levels for decades before being recognized nationally in 1966 by the Uniform Time Act. The US has observed DST for 106 years between 1918 and 2023 with DST being in at least one location
Most of Arizona and Hawaii don’t take part in Daylight Saving Time. Other non-observers are American Samoa, Guam, Northern Mariana Islands, Palmyra Atoll or Palmyra Island, Puerto Rico, US Minor Outlying Island and the Virgin Islands. Indiana introduced Daylight Savings Time in 2006.
Daylight Saving Time will return at 2 a.m. on Sunday, March 10, 2024, and last until Sunday, November 3, 2024, two days before the 2024 election.