<P> By 1962 , the transportation industry found the lack of consistency confusing enough to push for federal regulation . The result was the Uniform Time Act of 1966 ( P.L. 89 - 387 ) . Beginning in 1967 , the act mandated standard time within the established time zones and provided for advanced time : clocks would be advanced one hour beginning at 2 : 00 a.m. on the last Sunday in April and turned back one hour at 2 : 00 a.m. on the last Sunday in October . States were allowed to exempt themselves from DST as long as the entire state did so . If a state chose to observe DST , the time changes were required to begin and end on the established dates . In 1967 , Arizona and Michigan became the first states to exempt themselves from DST ( Michigan would begin observing DST in 1972 ) . In 1972 , the act was amended ( P.L. 92 - 267 ) , allowing those states split between time zones to exempt either the entire state or that part of the state lying within a different time zone . The newly created Department of Transportation ( DOT ) was given power to enforce the law . As of 2014 , the following states and territories are not observing DST : Arizona , Hawaii , American Samoa , Puerto Rico , and the Virgin Islands . </P>
<P> By 1962 , the transportation industry found the lack of consistency confusing enough to push for federal regulation . The result was the Uniform Time Act of 1966 ( P.L. 89 - 387 ) . Beginning in 1967 , the act mandated standard time within the established time zones and provided for advanced time : clocks would be advanced one hour beginning at 2 : 00 a.m. on the last Sunday in April and turned back one hour at 2 : 00 a.m. on the last Sunday in October . States were allowed to exempt themselves from DST as long as the entire state did so . If a state chose to observe DST , the time changes were required to begin and end on the established dates . In 1967 , Arizona and Michigan became the first states to exempt themselves from DST ( Michigan would begin observing DST in 1972 ) . In 1972 , the act was amended ( P.L. 92 - 267 ) , allowing those states split between time zones to exempt either the entire state or that part of the state lying within a different time zone . The newly created Department of Transportation ( DOT ) was given power to enforce the law . As of 2014 , the following states and territories are not observing DST : Arizona , Hawaii , American Samoa , Puerto Rico , and the Virgin Islands . </P>
when did arizona stop doing daylight savings time
when did arizona stop doing daylight savings time
1967
1967