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As Daylight Saving Time Approaches, a Good Opportunity to Look at U.S. Time Zones
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2021-03-11
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Abstract:The clocks in many American households will be set an hour ahead this weekend, signaling the arrival of Daylight Saving Time (DST). This “Spring Forward” tradition is observed across the nation, except for two states (Arizona—exclusive of the Navajo Nation—and Hawaii) and the five major U.S. territories of American Samoa, Guam, the Commonwealth of Northern Mariana Islands, Puerto Rico, and the U.S. Virgin Islands, all of which reside in America’s lesser-known time zones. The U.S. Department of Transportation (USDOT) has supervised standard time since the responsibility was transferred by Congress from the Interstate Commerce Commission when USDOT was established in 1966. Within USDOT, the Bureau of Transportation Statistics maintains a dataset of the nation’s time zones and their geographical boundaries as part of the National Transportation Atlas Database (NTAD).
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