Why America can't stop changing the clocks

In 2026 the House said yes and the Senate has not voted. But in March 2022 the Senate passed the same idea by unanimous consent, and the House never held a vote. Each chamber has said yes, four years apart, and each time the other one stopped. An obstacle that moves between buildings is rarely one person.

On the switch itself they agree: in an AP-NORC poll in October 2025 only 12% of adults supported changing clocks twice a year. The split comes one step later, when you have to keep one clock forever: summer time (daylight saving time, light late into the evening) or standard time (light early in the morning).

The Uniform Time Act of 1966 (15 U.S.C. §260a) sets the dates when clocks change and gives a state one way out: it may exempt itself and stay on standard time all year. That is how Arizona and Hawaii stopped. What a state may not do is stay on summer time all year.

All nineteen states that voted to stop wanted summer time. So their laws are promises that take effect the day Congress allows it; Delaware's waits on Pennsylvania, New Jersey and Maryland too.

The bill the House passed (H.R. 139) puts the whole country on summer time for good and takes away the way back to standard time. Only places already exempt (Arizona, Hawaii and the territories) may keep their old clock. Under the old law and the new bill alike, Washington decides which direction a state may go.

Boston and Detroit share a time zone. Detroit is about 12 degrees of longitude further west, so its sun rises 48 minutes later. On 3 January the sun rises in Boston at 7:14 and in Detroit at 8:02. On permanent summer time, Detroit's January sunrise would come at 9:02, Indianapolis at 9:06, Boise at 9:18.

China spans about five time zones by geography and has kept one clock, Beijing time, since 1949. In Kashgar the January sun rises at about 10:17. In Xinjiang many Uyghurs keep an unofficial local time two hours behind Beijing.

Zone lines are moved by the Department of Transportation when a county petitions, and the statutory test is the convenience of commerce (15 U.S.C. §261), not sunrise.

No clock adds a minute of daylight. Each only decides which end of the day gets it.

Summer time all year, chosen in Washington (H.R. 139). What nineteen state legislatures voted for, and what most people chose in the October 2025 poll. Price: winter mornings. America tried it in January 1974 as an oil-crisis emergency measure planned for two years; support fell from about four in five to two in five by February and Congress ended it before the year was out.

Standard time all year. Russia moved to it in 2014 after three years of permanent summer time, when Moscow's December sun rose close to ten; Mexico chose it in 2022. Price: a 4:07 June sunrise in Boston, summer evenings an hour shorter, and a choice against the majority of that poll. Mexico's border towns kept switching to stay in step with the US.

Each state chooses (H.R. 9638, introduced July 2026: standard time by default, states may move forward all year or seasonally; close to the EU Commission's 2018 proposal). Price: a patchwork; across a zone line, two hours between neighbours. The European Parliament voted to end the switch in March 2019 (410–192); by 2026 the member governments had not agreed. In Arizona the Navajo Nation switches and the Hopi reservation inside it does not.

Arizona had nothing Florida lacks but the direction: it wanted the clock the 1966 law lets a state keep. Most people want to stop changing the clocks. The disagreement is which clock to keep, and the answer lands differently depending on where your town sits in its time zone.