Daylight saving time in 2024 changed on two dates: clocks moved forward on March 10 and back on November 3

In the United States, daylight saving time (DST) began at 2 a.m. on Sunday, March 10, 2024. At that moment, clocks jumped forward one hour to 3 a.m., giving the evening an extra hour of daylight. The change ended on Sunday, November 3, 2024, when clocks moved back one hour at 2 a.m., returning to standard time.

These dates apply across most of the country. However, Hawaii, most of Arizona, and some U.S. territories do not observe daylight saving time and kept the same clock year-round. If you live in one of those places, your clocks did not change either date.

Key Takeaways

  • Daylight saving time started on March 10, 2024, at 2 a.m., when clocks moved forward one hour.
  • Standard time returned on November 3, 2024, at 2 a.m., when clocks moved back one hour.
  • Hawaii, most of Arizona, and some U.S. territories do not change their clocks and remained on the same time all year.
  • The change affects when sunrise and sunset occur but does not change the actual passage of time.

Why the time changes on these specific dates

The dates for daylight saving time are set by federal law. Congress established that DST would begin on the second Sunday in March and end on the first Sunday in November. This means the exact dates shift slightly each year, but they always fall within the same week range.

The reasoning behind these dates is to align daylight hours with when most people are awake and active. By moving the clock forward in spring, sunset occurs later in the evening, extending daylight into the time when people typically leave work or school. In fall, moving the clock back aligns sunrise earlier with morning commutes.

What changed on March 10, 2024

When daylight saving time began on March 10, clocks moved forward one hour at 2 a.m. This meant that 2 a.m. became 3 a.m. instantly. Most people experienced this change when they woke up — their clocks showed one hour later than they expected.

The practical effect was that sunrise and sunset both occurred about one hour later on the clock than they would have without the change. Sunrise moved from around 7 a.m. to around 8 a.m., and sunset moved from around 6 p.m. to around 7 p.m. This gave people more daylight in the evening but less in the morning.

What changed on November 3, 2024

When standard time returned on November 3, clocks moved backward one hour at 2 a.m. This meant that 2 a.m. became 1 a.m., giving that hour twice. Most people noticed the change when they woke up — their clocks showed one hour earlier than expected, and they gained an extra hour of sleep if they stayed in bed through the transition.

The practical effect was that sunrise and sunset both occurred about one hour earlier on the clock. Sunrise moved from around 7 a.m. back to around 6 a.m., and sunset moved from around 5 p.m. to around 4 p.m. This restored more daylight in the morning but meant darkness fell earlier in the evening.

Which devices and systems updated automatically

Most modern devices updated their clocks automatically on both dates. Smartphones, computers, tablets, and smartwatches connected to the internet typically adjusted without any action from you. These devices receive time updates from network time servers that account for daylight saving time rules.

Devices that do not connect to the internet — such as wall clocks, car clocks, and some older appliances — required manual adjustment. If you have a device that did not update on its own, you can change it by hand using the clock settings or the physical buttons on the device.

Places that did not change their clocks in 2024

Hawaii and most of Arizona do not observe daylight saving time. These states remain on standard time all year, so their clocks did not change on March 10 or November 3. The Navajo Nation, which spans parts of Arizona, New Mexico, and Utah, does observe daylight saving time, so clocks changed there even though most of Arizona did not.

U.S. territories including Puerto Rico, the U.S. Virgin Islands, Guam, American Samoa, and the Northern Mariana Islands also do not observe daylight saving time. If you were in any of these places in 2024, your clocks stayed the same throughout the year.

How to find out what time it is in your location

The easiest way to know whether your location observes daylight saving time is to check your device's automatic time settings. If your phone or computer adjusted on March 10 and November 3, your location follows daylight saving time. If it did not, your area stays on standard time year-round.

You can also search online for your state or territory name plus "daylight saving time" to confirm. Government websites and time-tracking sites list which regions observe the change and which do not. If you travel between regions that observe different time rules, your device will update automatically when you cross the border, as long as location services are enabled.

Frequently Asked Questions

Did daylight saving time happen on the same date everywhere in the United States?

Yes, daylight saving time changed on the same dates nationwide for places that observe it: March 10 and November 3, 2024. However, Hawaii, most of Arizona, and U.S. territories did not change their clocks on either date because they do not observe daylight saving time.

Why do some places not change their clocks?

States and territories can choose not to observe daylight saving time under federal law. Hawaii and Arizona decided the practice does not benefit their residents and opted out. Hawaii's location near the equator means daylight hours do not vary as much throughout the year, and Arizona's hot climate means people prefer earlier sunsets in summer.

If I travel, do I need to manually change my clock?

No. Your smartphone and most connected devices will update automatically when you travel to a different time zone or region. If you are using an older device without internet connection, you may need to adjust it manually, but modern phones and computers handle the change on their own.

Does daylight saving time actually give us more daylight?

No. Daylight saving time does not create more daylight — the sun rises and sets at the same times regardless of what the clock says. The change only shifts when those times appear on the clock. Moving the clock forward in spring makes sunset occur later on the clock, but the actual amount of daylight stays the same.

Will daylight saving time continue in 2025?

Yes, unless Congress changes the law. Daylight saving time is scheduled to continue in 2025 and beyond, with the same pattern: beginning on the second Sunday in March and ending on the first Sunday in November. Some states and territories may continue to opt out, but the federal rule remains in place.