Arizona highway sign with notice for travelers about local time standard.
Time in Arizona, as in all U.S. states, is regulated by the United States Department of Transportation[1] as well as by state and tribal law.
All of Arizona is in the Mountain Time Zone.[2] Since 1968, most of the state—except the Navajo Nation—does not observe daylight saving time and remains on Mountain Standard Time (MST) all year. This results in most of Arizona having the same time as neighboring California each year from March to November, when locations in the Pacific Time Zone observe daylight saving time.
^"Uniform Time". US Department of Transportation. 13 February 2015. Archived from the original on 24 August 2018. Retrieved 24 August 2018. The U.S. Department of Transportation (DOT) oversees the Nation's time zones and the uniform observance of Daylight Saving Time. The oversight of time zones was assigned to DOT because time standards are important for many modes of transportation.
^Cite error: The named reference TND was invoked but never defined (see the help page).
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