Ariana Brockington is a trending news reporter at TODAY digital. She is based in Los Angeles.
The holiday season is just around the corner which means it is almost time to “fall back” to mark the end of daylight saving time. Daylight saving, which refers to most U.S. states moving an hour ahead to maximize sunlight during spring and summer, began on March 9.
But in just a few weeks, many will gain an extra hour of sleep as clocks are turned one hour back for the fall and winter months. “We advance our clocks ahead one hour at the beginning of DST, and move them back one hour when we return to standard time ,” the National Institute of Standards and Technology explains on its website. “The transition from DST to ST effectively moves one hour of daylight from the evening to the morning.” Read on to learn more about when daylight saving time ends, which states and territories are impacted by the change and who regulates daylight saving time, below. When Does Daylight Saving Time End in 2025? Daylight saving time starts on the second Sunday of March every year and concludes on the first Sunday of November, according to the NIST. The daylight save time cycle for this year will end on Sunday, Nov. 2, when clocks will “fall back” one hour. What Time Does Daylight Saving Time End? The rules for daylight saving time changed after the Energy Policy Act of 2005. Since then, “DST is now in effect for 238 days, or about 65% of the year, although Congress retained the right to revert to the prior law should the change prove unpopular or if energy savings are not significant,” the NIST explains on its website. On Nov. 2, those who live in areas that follow daylight saving time will adjust their clocks to 1 a.m. when the local time reads 2 a.m., thus giving them an extra hour. Which U.S. States Don’t Observe Daylight Saving Time? The U.S. Department of Transportation explains on its website that the amended Uniform Time Act allows states to exempt themselves from observing daylight saving time. The following states and territories do not observe daylight saving time: Hawaii, American Samoa, Guam, Northern Mariana Islands, Puerto Rico, the Virgin Islands, and most of Arizona. However, the NIST notes that the Navajo Indian Reservation, which is located in parts of Arizona, does follow daylight saving time. “Daylight saving time and time zones are regulated by the U. S. Department of Transportation, not by NIST. However, as an official timekeeper for the United States, NIST observes all rules regarding DST when it distributes time-of-day information to the public,” the NIST website reads. Why Did Daylight Saving Time Start? Daylight saving time, which used to be known as “war time,” first began on March 19, 1918, according to the U.S. Department of Defense. The time change, implemented under the Standard Time Act, “allowed for additional daylight hours to be added into the day to help save energy costs during World War I.” The same law also created five time zones in the U.S. After a year, the law was repealed when WWI ended. But when World War II began, Congress decided in February 1942 that a national daylight saving time was needed to preserve fuel and “promote national security and defense.” Thus, daylight saving time also became known as “war time.” The conclusion of WWII in 1945 led to the law being repealed again. Then in 1966, following decades of confusion, the Uniform Time Act was passed. The act has been amended throughout the years, and in 2005 President George W. Bush extended daylight saving time to its current format: the second Sunday in March until the first Sunday in November.
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