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Why Do Clocks Fall Back and Who Decided It?

Clocks fall back on November 1, 2026 because federal law sets the DST schedule. Here's how that rule began and where the repeal bill stands.

By Written Facts StaffOctober 17, 20267 min read

You get an extra hour of sleep on a Sunday morning in November, and by Tuesday it's dark at the dinner table. Clocks fall back because daylight saving time (DST) ends and standard time returns. The US Congress made that decision, not your state or your city. This year the change comes on November 1, 2026, the night after Halloween. It will happen even though the House has voted to stop it.

The short answer

Under federal law, DST in the United States starts at 2:00 a.m. on the second Sunday in March and ends at 2:00 a.m. on the first Sunday in November. In 2026 that means March 8 to November 1. When it ends, 2:00 a.m. becomes 1:00 a.m. again, and the hour you lost in spring comes back to you.

The schedule is set by Congress in federal law. The Department of Transportation is the agency that oversees DST and the country's time zones. States have one real choice, covered below: they can stay on standard time all year. They can't stay on DST all year, and they can't pick their own dates.

The practice itself started as a wartime measure. Germany became the first country to adopt DST nationwide in 1916, during World War I. The goal was to save energy, which at the time mostly meant coal. Britain and other countries soon followed. Whether DST actually saves energy is still debated, and experts disagree. By then, though, the idea already had a long history.

Who first came up with it

The earliest version was a joke. In 1784 Benjamin Franklin wrote a satirical essay about saving money, and in it he suggested making better use of morning daylight. He was mostly kidding.

The first serious proposal came from New Zealand. In 1895 George Vernon Hudson, an entomologist, proposed a seasonal time shift to the Royal Society there. His reason was personal: he wanted more daylight after work for collecting insects.

The man who did the most to promote it was William Willett, a British builder. In July 1907 he paid to publish a pamphlet called The Waste of Daylight. It proposed moving clocks forward 80 minutes in April, in four 20-minute steps on successive Sundays, and moving them back the same way in September. By 1908 he had the support of a Member of Parliament, Robert Pearce, who tried several times to make the plan law. Every attempt failed.

None of the three lived to see the idea adopted. Willett came closest. He died on March 4, 1915, aged 58. Fourteen months later Britain passed its daylight saving law, and the clocks went forward an hour on May 21, 1916. Germany had already done it that spring. It took a world war to put the idea into practice.

War, repeal and chaos

The United States adopted DST in 1918, the year World War I ended. It didn't last. Congress repealed it after the war, and the pushback is usually credited mainly to farmers, whose work follows the sun rather than the clock. Historians still debate how much the farmers actually mattered.

The idea came back with the next war. Britain, Germany and the US all brought DST back during World War II. The US did so about a month after the attack on Pearl Harbor. When the war ended, Congress repealed it again.

This time the country didn't simply go back to one clock. More and more towns and states adopted DST on their own, with their own start and end dates. Neighboring areas could be an hour apart for part of the year. For anyone running a train schedule, a broadcast or a business across state lines, it was a mess. Congress eventually stepped in to fix it.

How Congress set one schedule

The fix was the Uniform Time Act of 1966. It set one national schedule for DST and ended the patchwork of local choices.

The law left states one way out. Any state can choose not to observe DST at all and stay on standard time all year. But a state that does observe DST has to do it statewide, on the federal start and end dates. A state can't run its own calendar, and a single city or county can't set its own rule. That is still the rule today, and it's why "who decided it" has a clear answer: Congress sets the dates, and the only choice a state has is whether to take part.

Congress has changed the dates since then. The Energy Policy Act of 2005 made DST about a month longer, and the new schedule took effect in 2007. That change created today's rule of the second Sunday in March to the first Sunday in November. DST now lasts 238 days a year, about 65% of the calendar. Standard time, the "normal" time, now covers only about a third of the year.

Who doesn't fall back, and will it end?

Some Americans won't change their clocks at all on November 1. Hawaii and most of Arizona stay on standard time all year. So do American Samoa, Guam, the Northern Mariana Islands, Puerto Rico and the US Virgin Islands.

Arizona last observed DST in 1967. The usual explanation is the heat: an extra hour of evening sun in an Arizona summer isn't welcome, and it keeps air conditioners running longer. The Navajo Nation is the exception. It does observe DST, to stay in step with Navajo communities in Utah and New Mexico. Hawaii tried DST in 1933 and dropped it after three weeks. It followed DST during World War II and stopped in 1967. Close to the equator, the islands get roughly 11 to 13.5 hours of daylight all year, so there's little to shift.

For everyone else, the twice-a-year change could end someday. On July 14, 2026, the House passed the Sunshine Protection Act, 308–117. The bill would put the whole country on DST all year. President Trump supports it. Nineteen states have already passed laws to make DST permanent, but those laws can't take effect while federal law doesn't allow it.

The bill has stalled in the Senate, though. As of late September it was still in the Commerce, Science and Transportation Committee without a vote. Majority Leader John Thune has said there's "no clear path forward or consensus on it yet." He has also doubted it can get the 60 votes it needs to advance. The Senate then recessed for the midterm elections, and senators aren't due back until November 9, eight days after the change. A similar bill passed the Senate unanimously in March 2022 and then died in the House. To stop this year's change, the Senate would have had to pass the bill and the President sign it before November 1. That isn't going to happen, so the clocks will fall back on November 1 as scheduled. Congress.gov has the bill's latest status.

Not everyone wants permanent DST, either. The American Academy of Sleep Medicine opposes the bill and supports the opposite plan: permanent standard time. The two options would feel very different in winter. Permanent DST keeps summer-style evenings all year, but it pushes sunrise an hour later on winter mornings. Senator Tom Cotton, the bill's most vocal opponent in the Senate, has warned of "absurdly late sunrises in the winter" that would "again make winter a dark and dismal time for millions of Americans." Under current law, states may already choose year-round standard time. Even if the bill passes, states could still choose standard time by passing their own laws.

So for now, the rule from 1966 still holds, with the dates set in 2005. Set the clocks back an hour on November 1, and plan on darker evenings through Thanksgiving.

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