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As the colder months draw near, many US citizens will also see more hours of daylight in the mornings and darker evenings – due to the end of daylight saving time (DST).

Daylight saving time is the practice of setting the clock forward an hour each spring, beginning on the second Sunday in March and ending on the first Sunday in November. However, that wasn’t always the case.

This year, daylight saving time ends on Sunday, November 3 – when most people in the US will get an extra hour of sleep.

When does daylight saving time begin and end?

In the US, daylight saving time begins on the second Sunday of March, which fell on March 10, 2024. At 2am local time, the clocks were set forward by an hour for most US citizens.

On November 3, 2024, daylight saving time will end at 2am local time when we “fall back” and gain an extra hour of sleep. It will occur again next year on Sunday, March 9, 2025.

Who follows daylight saving time?

In the United States, most states adhere to the rules of daylight saving time, with the exception of Arizona, the Navajo Indian Reservation, and Hawaii, according to the National Institutes of Standard and Technology (NIST).

The territories of American Samoa, Guam, the Northern Mariana Islands, Puerto Rico, and the US Virgin Islands also do not follow the practice.

Why do we follow daylight saving time?

The idea for daylight saving time was reportedly first proposed by Benjamin Franklin in 1784. However, it did not become uniformly implemented until 1966 when the Uniform Time Act was created, according to the US Department of Transportation.

Although there were previous periods where the US followed daylight saving – including during World War II when President Roosevelt instituted year-round daylight saving called “War Time” – the Uniform Time Act mandated that all states follow a time as decided under the four main time zones and follow DST, unless the entire state agreed to be exempt. The Uniform Time Act also meant that all states would implement the time change at the same time.

In later years, the Department of Transportation hypothesized that daylight saving could positively impact violent crime rates, traffic safety, and energy conservation. However, a subsequent report found that there were minimal changes when DST was implemented.

The daylight saving time the United States follows now wasn’t implemented until 2007, when it was decided it would begin on the second Sunday of March and end on the first Sunday of November. The annual practice previously took place from the last Sunday of April to the last Sunday of October.

DST is now followed for 238 days of the year.

Do you have to manually switch your clocks?

Most clocks will update the time on their own. However, certain appliance clocks may require the time to be updated manually.

Some clocks may also have a DST on/off function that needs to be switched on to change the time.

Why do some Americans call for an end to DST?

In recent years, the practice of daylight saving time has become increasingly unpopular, with multiple states proposing bills to end the practice of switching clocks. In March 2022, the Senate passed The Sunshine Protection Act, which would make US daylight saving time permanent. The bill was introduced in the House in March 2023, though it has yet to be passed.

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