" clearly show that we must wait until about 9 p.m. in the summer (instead of 8 p.m., like it does currently). If Arizona were to observe Daylight Saving Time, the sun would stay out until 9 p.m. But Arizona asked for – and was eventually granted an exemption.Īccording to an Arizona Republic editorial from 1969, the reason was the state's extreme heat. In 1973, a more permanent federal law was enacted to help with the oil shortages of that time. Over the course of the last 100 years, the United States (including Arizona) has gone on Daylight Saving Time in both World War 1 and World War 2 but then gone off after the wars were over. Government, that leads to energy and fuel savings. Switching to DST in the summer means more sunlight at night, which in turn means homes don't have to turn on lights as early.Īccording to the U.S. The history of daylight saving is tied to energy conservation. It means the state is in the same time zone as Denver from November to March but then falls behind Denver to Los Angeles time from March to November. "Following, employees slept 40 min less, had 5.7 percent more workplace injuries, and lost 67.6 percent more work days because of injuries than on non-phase change days," explained the study, which looked at mining injuries between 19 from the National Institute for Occupational Safety and Health.Īrizona's independence from this annual time change can cause a lot of confusion for residents and visitors alike.
That's enough power for 100,000 households over a year.Īnother study shows that switching clocks causes a 25 percent jump in heart attacks in the few days following the switch.Ī 2009 Michigan State University published by the American Psychological Association study showed that DST has adverse effects on the American workplace. Department of Energy said sticking with one time could save approximately 0.5% of electricity per day for the country. March 12, 2023, marks the start of Daylight Saving Time for most of the United States.īut unlike almost everywhere else, Arizona doesn't observe Daylight Saving Time and hasn't done so for about the last 40 years.Ī 2008 report from the U.S. Clocks in 48 states will "spring forward" this weekend as most of the United States moves to Daylight Saving Time (DST) - but not for Arizona.
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