The US is split over Daylight Saving Time. Here’s Why

Most of the United States still follows the same daylight saving schedule set by federal law, even as the debate over whether to keep it has grown louder in Congress and statehouses. The split is not really about whether people like changing clocks. It is about what should come next, and who has the power to make that change.

Congress keeps the issue alive, but the law has not changed

The latest federal push came on January 7, 2025, when Sen. Rick Scott of Florida introduced the Sunshine Protection Act of 2025 in the Senate, according to the bill text filed in the 119th Congress. That bill would make daylight saving time permanent for places that now observe it, but it had not become law as of July 24, 2026.

Current federal rules still control the clock for most of the country. The National Institute of Standards and Technology said daylight saving time in 2026 runs from March 8 at 2 a.m. to November 1 at 2 a.m., and the U.S. Department of Transportation said states that observe it must follow those federally mandated dates.

The legal split is a big reason the national argument drags on. The Department of Transportation says states may opt out of daylight saving time and stay on standard time year round by state law, but they do not have authority to adopt permanent daylight saving time on their own.

The local map is uneven, and that affects daily life

That federal rule has created a patchwork that travelers see every year. NIST says Hawaii and most of Arizona do not observe daylight saving time, while Puerto Rico, Guam, the U.S. Virgin Islands, American Samoa, and the Northern Mariana Islands also stay on standard time year round.

Even inside Arizona, there is an exception. NIST says the Navajo Nation does observe daylight saving time, which means nearby communities can follow different clocks depending on jurisdiction and season.

For residents, the split shows up in very ordinary ways. Airline schedules, school start times, work calls, and TV programming all have to track whether a place follows the March and November clock changes, and DOT says it oversees uniform time observance because time standards matter across transportation systems nationwide.

The real disagreement is over health, sunlight, and convenience

There is broad agreement that many Americans dislike changing clocks twice a year, but that does not settle the harder question. The American Academy of Sleep Medicine said in a 2020 position statement, updated with a permanent standard time statement in 2024, that seasonal clock changes should be abolished and replaced with year-round standard time for health and safety.

That puts sleep medicine experts at odds with many lawmakers who back permanent daylight saving time because it keeps later evening light. The AASM said standard time better aligns with human circadian biology, while the case for longer evening daylight has remained politically popular in states that want brighter post-work hours.

So the country is split for two reasons at once. Federal law allows permanent standard time but not permanent daylight saving time without Congress, and the two main replacement options still have different backers. Until Congress changes the Uniform Time Act, most Americans will keep springing forward in March and falling back in November.