Daylight saving time ends Sunday. Here’s what to know : NPR

Vintage clocks, seen here at the Electric Time Company in Medfield, Massachusetts, will need to be reset to reflect Sunday’s time change.

Charles Krupa/AP

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Charles Krupa/AP

It’s that time of year again: Many Americans will need to reset their clocks and circadian rhythms when Daylight Saving Time ends on Sunday.

This means, in most states, brighter mornings and darker evenings.

At 2 a.m. Sunday, the time will move back an hour for millions of people across the country — an adjustment that has been both welcomed by those looking for extra sleep time or criticized by those who see it as an inconvenience.

Here’s what you need to know.

How many states observe daylight saving time?

All U.S. states observe daylight saving time except Hawaii and Arizona. according to the National Conference of State Legislatures (NCSL). However, the part of the Navajo Nation located in Arizona observes daylight saving time. The U.S. territories of Guam, Puerto Rico, American Samoa, Virgin Islands, and Northern Mariana Islands also do not change their time.

Many others want it. Nineteen states have passed legislation that would allow daylight saving time for its residents throughout the year, the NCSL said.

“Because federal law does not currently authorize full-time DST, Congress should act before states can enact changes,” according to the NCSL.

Many Americans want to switch to daylight saving time year-round

In the United States, only 12% of adults support the current daylight saving time system, while 47% oppose it, according to one study. AP-NORC survey released Thursday.

And 56% of adults surveyed said they preferred permanent daylight saving time with less light in the morning and more light in the evening, according to the poll. Forty-two percent said they preferred a permanent standard time, with more light in the morning and less light in the evening.

Making daylight saving time permanent has failed again

President Trump has urged Congress to pass legislation that would make daylight saving time permanent — which, if passed, would end the debate over whether the time in the United States should be changed twice a year.

The House and Senate should “work hard to get more daylight at the end of the day,” the president wrote in April on Truth Social.

But the attempt to stop the time adjustment is once again blocked in Congress.

The Sunshine Protection Act, sponsored by Republican Sen. Rick Scott of Florida with bipartisan support, would make daylight saving time the permanent standard time. Earlier this week, Republican Sen. Tom Cotton of Arkansas objected to Scott’s request to advance the measure using unanimous consent, which said permanent daylight saving time would make winter “a dark and dreary time for millions of Americans.”

“By moving the clock back an hour in winter, permanent daylight saving time would push winter sunrises to an absurdly late hour, depriving Americans of the early morning sunshine that is essential to our safety and well-being,” Cotton said on the Senate floor Tuesday.

Former Sen. Marco Rubio, another Florida Republican, previously championed the bill, first introducing it in 2018 and reintroducing it in 2021. The Senate passed the bill in 2022, but it never came to a vote in the House.