<P> In March 2015 the Alaska Senate passed a bill, introduced by state senator Anna MacKinnon, to end daylight saving time . The Alaska House formed a sub-committee that was due to look into the issue during the 2016 legislative session . </P> <P> Arizona observed DST in 1967 under the Uniform Time Act because the state legislature did not enact an exemption statute that year . In March 1968 the DST exemption statute was enacted and the state of Arizona has not observed DST since 1967 . This is in large part due to an effort to conserve energy . Phoenix and Tucson are among the hottest U.S. metropolitan areas during the summer, resulting in more power usage from air conditioning units and evaporative coolers in homes and businesses . An extra hour of sunlight while people are active would cause people to run their cooling systems longer, thereby using more energy . </P> <P> The Navajo Indian Reservation extends into Utah and New Mexico and does observe daylight saving time . The Hopi Reservation is entirely within the state of Arizona and is an enclave within the Navajo Indian Reservation, but does not observe DST . </P> <P> California voters passed Proposition 12 in 1949, approving DST in the state . In February 2017, California Assembly member Kansen Chu introduced A.B. 807, proposing to enable the legislature to eliminate DST in the state, or, if federal law allows, to adopt DST for the entire year . However, Chu later shelved his bill in September 2017 . </P>

What states are on daylight savings time year-round