Schermerhorn said our circadian rhythms would throw a wrench in that plan. So, would it be easier to have one, universal time? For instance, the Navajo Nation participates in the time change, but the Hopi Tribe does not.ĭST also is not observed in Hawaii, American Samoa, Guam, Puerto Rico or the Virgin Islands. “It means shifting the time to when the day is hottest so citizens promptly said, ‘No, we don’t want that,’ and Arizona opted out.”Īrizona has been on Mountain Standard Time since 1968.īut there are many oddities with the time-zone system, even within Arizona. The state originally participated in the time change, until there was a public outcry in 1967.Ĭalvin Schermerhorn, a history professor at Arizona State University, said people were reluctant to pay for an extra hour of air conditioning. (Clocks are adjusted in most of the United States and its territories the second Sunday in March and the first Sunday in November.) A KJZZ listener asked through our Q&AZ reporting project why doesn’t Arizona participate in daylight saving time.Īrizona has a long history of opting in and out of daylight saving (DST), which started in the United States in 1918 to create more sunlight in warm-weather months. When most of the country is told to adjust their clocks this weekend, Arizona doesn’t need to re-set anything. 3, when most Americans “fall back” and set their clocks back one hour - essentially gaining one hour of daylight, according to the Old Farmer’s Almanac.The sun sets in Scottsdale in October 2018. So does Hawaii, the only other state that doesn’t observe daylight saving time.ĭaylight savings ended Nov. “We’ll have to think and act more like computers and less like human beings where we have this internalized, cultural clock,” he said.įor now, Arizona follows its own clock. Schermerhorn said human circadian rhythms would throw a wrench in that plan. That means someone could drive through three time changes while never leaving the state, according to a Cronkite News article. Daylight saving time is observed on the vast Navajo Reservation but not on the Hopi Reservation, which is surrounded by Navajo lands. “It means shifting the time to when the day is hottest, so citizens promptly said, ‘No, we don’t want that,’ and Arizona opted out,” he said.īut not all of Arizona opted out. Arizona signed on, but that extra hour of daylight quickly provoked a public outcry.Ĭalvin Schermerhorn, a history professor at Arizona State University, said Arizona residents and businesses objected to paying for an extra hour of air-conditioning. It standardized time zones and called for nationwide daylight savings rules, but states were allowed to opt out of daylight saving. It was repealed after the war, but experiments with the idea continued until 1966, when the Uniform Time Act became law. Source: Arizona State Library, Archives and Public Records Within Arizona, however, the Navajo Nation does. Today: Arizona and Hawaii, along with Puerto Rico, American Samoa, Guam, the Northern Marianas and the U.S. October 1944: Arizona returns to Mountain Standard Time.Īpril-October 1967: Arizona joins the rest of the nation in DST under the Uniform Time Act of 1966.ġ968: Arizona opts out of future participation in DST.ġ974: Arizona, with Idaho and Oregon, is exempted from a federal trial of year-round DST. January 1944: Arizona goes off War Time, though some Western communities remain and some interstate commerce continues to observe it. Summer 1921: Some Yuma County communities observe DST.įebruary 1942: Nation moves to “War Time,” Arizona complies, again in two time zones. March 1919: Country returns to DST, Arizona complies but again in two time zones. Arizona complies, but some areas are in the Mountain Time Zone and some in the Pacific Time Zone. March 1918: DST is established nationwide to save energy during World War I. Arizona has a long on-again, off-again relationship with daylight saving time (DST), here are a few examples:
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