Daylight Saving Time is once again upon us with the onset of Spring. In just days, BVA members and their families will lose an hour of sleep if they slumber during their normal hours. With the exception of the states of Arizona and Hawaii, most of the continental United States “springs forward” officially one hour at 2:00am local time on Sunday, March 10. The additional daylight during the evening hours will last until November 3, when we “fall back” an hour.

More than 60 percent of the countries in the world do not set their clocks forward and back. The remaining countries observe Daylight Saving Time during the summer months, generally setting clocks forward one hour from standard time.

Daylight Saving Time has been around for more than 100 years. It was originally established in 1918 to save energy costs during World War I, according to the Library of Congress. The law was repealed about a year later due to the war’s end but implemented once again during World War II. It was reinstated to help conserve fuel and “promote national security and defense,” and as a result, called “war time.”

The law was repealed a second time, following the War’s end, to allow states to establish their own standard time, the Library of Congress stated. Daylight Saving Time later became standard in the U.S. until the passage of the Uniform Time Act of 1966, which mandated standard time across the country within established time zones.

Nearly every state in the union 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.