The Uniform Time Act of 1966 – which allows states to choose whether to remain on standard time or change their clocks twice a year – has been in effect in the U.S. since 1967.
Hawaii also stays on standard time.
Within Arizona, the Navajo Nation has opted to continue observing DST, which ensures that everyone on the reservation that spans three states is in the same time zone.
Arizona participated in daylight saving time in 1967, but energy consumption soared. Air conditioners had to run longer.
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