Why do we observe daylight savings time?

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Twice a year, you wake up to find that your circadian rhythm has been disrupted. Daylight savings time strikes again! In the spring, our clocks spring forward an hour, and in the fall, they fall back an hour. Why do we do this?

DST was first implemented in Germany in 1916, with the military hoping it would help conserve energy during World War I. The United States promptly followed suit in 1918, although it was repealed a year later. It would make a comeback in 1942, once again implemented as a wartime measure to conserve energy.

While most locales chose to abandon it post-war, New York City went against the grain and continued observing it, influencing other areas to do the same. This led to a patchwork scenario where some towns observed the time change while others didn’t. To bring order to the situation, Congress passed the Uniform Time Act in 1966, which standardized DST and its schedule nationwide—except for Hawaii and Arizona, which decided to stick with standard time year-round.

In recent years, U.S. lawmakers, including Colorado Gov. Jared Polis, have expressed interest in transitioning to permanent DST. This discussion gained momentum when the U.S. Senate unanimously approved the Sunshine Protection Act of 2021, which aimed to eliminate the biannual clock adjustments. However, for permanent DST to become a reality, the Sunshine Protection Act must be approved by the House of Representatives and signed into law by President Joe Biden.

Until then, make sure to set your clocks ahead on March 10.