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Time in Arizona, as in all U.S. states, is regulated by the United States Department of Transportation.
Arizona is in the Mountain Time Zone.
Daylight saving time
Unlike most of the United States, Arizona does not observe daylight saving time (DST), with the exception of the Navajo Nation, which does observe DST. The Hopi Reservation, which is not part of the Navajo Nation but is geographically contained within it, does not observe DST.
The tz database version 2016j contains two time zones for Arizona:
References
Time in Arizona Wikipedia(Text) CC BY-SA