What's Daylight Savings

When is Daylight Saving Time in 2023? Here's What to Know About the Upcoming Time Change

Not long ago, in early November, clocks fell back one hour, reverting to standard time as winter neared and ending the period of daylight saving time for 2022. While it may feel like just yesterday that clocks fell back in early November for the end of daylight saving time, it won't be long until clocks "spring forward" for the season. Most U.S. states, including Illinois, will move their clocks forward in mid-March, marking the beginning of daylight saving time and extending sunlight further into the evening hours. That change is expected to happen this year, even as legislation over whether to make daylight saving time permanent is considered by lawmakers.

Here's what to know about the changing of clocks for 2023:

When does daylight saving time start? Under provisions of the Energy Policy Act of 2005, which amended the Uniform Time Act of 1966, daylight saving time will begin on the second Sunday in March. In 2023, that day is March 12.

When does daylight saving time end? Daylight saving time will end at 2 a.m. on Nov. 5, 2023.

What is daylight saving time? Daylight saving time is the changing of the clocks that typically begins in spring and ends in fall. Under the conditions of the Energy Policy Act of 2005, daylight saving time starts on the second Sunday in March and ends on the first Sunday in November. On those days, clocks either shift forward or backward one hour. But that wasn't always the case.

Clocks used to spring ahead on the first Sunday in April and remained that way until the final Sunday in October, but a change was put in place in part to allow children to trick-or-treat in more daylight. In the United States, daylight saving time lasts for a total of 34 weeks, running from early-to-mid March to the beginning of November in states that observe it. Some people like to credit Benjamin Franklin as the inventor of daylight saving time when he wrote in a 1784 essay about saving candles and saying, "Early to bed, early to rise makes a man healthy, wealthy and wise." But that was meant more as satire than a serious consideration. Germany was the first to adopt daylight saving time on May 1, 1916, during World War I as a way to conserve fuel. The rest of Europe followed soon after. The United States didn't adopt daylight saving time until March 19, 1918. It was unpopular and abolished after World War I. On Feb. 9 ,1942, Franklin Roosevelt instituted a year-round daylight saving time, which he called "war time." This lasted until Sept. 30, 1945.’

Daylight saving time didn't become standard in the US until the passage of the Uniform Time Act of 1966, which mandated standard time across the country within established time zones. It stated that clocks would advance one hour at 2 a.m. on the last Sunday in April and turn back one hour at 2 a.m. on the last Sunday in October. States could still exempt themselves from daylight saving time, as long as the entire state did so. In the 1970s, due to the 1973 oil embargo, Congress enacted a trial period of year-round daylight saving time from January 1974 to April 1975 in order to conserve energy.

Which states observe daylight saving time? Nearly every U.S. state observes daylight saving time, with the exceptions of Arizona (although some Native American tribes do observe DST in their territories) and Hawaii. U.S. territories, including Puerto Rico, American Samoa, Guam and the U.S. Virgin Islands, do not observe daylight saving time.

What is standard time? According to the website Time and Date, standard time is the local time in a country or region when daylight saving time is not in use. "More than 60% of the countries in the world use standard time all year," the site says. "The remaining countries use DST during the summer months, generally setting clocks forward one hour from standard time." According to the AASM, it's standard time that more closely matches our body's internal clock. "The daily cycle of natural light and darkness is the most powerful timing cue to synchronize our body’s internal clock," the Illinois-based organization says. "When we receive more light in the morning and darkness in the evening, our bodies and nature are better aligned, making it easier to wake up for our daily activities and easier to fall asleep at night. Daylight saving time disrupts our internal clock, leading to sleep loss and poor sleep quality, which in turn lead to negative health consequences."

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