PHOENIX - This weekend marks the end of Daylight Saving time for most of the United States – but not Arizona.
Unlike almost everywhere else, Arizona doesn't observe Daylight Saving Time (DST), and hasn't done so for the last 40 years.
Arizona's independence from DST can cause a lot of confusion for both residents and visitors.
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.
Why doesn't Arizona change? It has a lot to do with the weather.
The history of daylight saving is tied to energy conservation. 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.
According to the U.S. Government , that leads to energy and fuel savings.
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.
In 1973, a more permanent federal law was enacted to help with the oil shortages of that time. But Arizona asked for – and was eventually granted an exemption.
According to an Arizona Republic editorial from 1969, the reason was the state's extreme heat. If Arizona were to observe Daylight Saving Time, the sun would stay out until 9 p.m. in the summer (instead of 8 p.m., like it does currently).
"[Data] clearly show that we must wait until about 9 p.m. DST to start any night-time activity such as drive-in movies, moonlight rides, convincing little children it’s bedtime, etc," the editorial stated. "And it’s still hot as blazes!"
Another Arizona Republic editorial from 1968 stated, "Drive-in theaters, the parents of small children, the bars, the farmers and those who do business with California" were against Daylight Saving time while "power companies, the evening golfers, the late risers, and the people with business interests on the Eastern seaboard" were for it.
But don't be fooled by Arizona's DST stance. Not every corner of Arizona is exempt from Daylight Saving Time today.
The Navajo Indian Reservation follows DST, but the reservation stretches across four different states.
If all of Arizona were to re-evaluate its stance and choose to observe DST, here's what would change.
Instead of sunrise at 5:30 a.m. during most of the summer, the sun would come up at 6:30 a.m. And at the end of the day, the sun would set at 9 p.m. instead of 8 p.m. Winter sunrise and sunset times would remain the same.
A 2009 Michigan State University published by the American Psychological Association study showed that DST has adverse effects on the American workplace.
"Following [the start and end of DST], employees slept 40 min less, had 5.7% more workplace injuries, and lost 67.6% more work days because of injuries than on non phase change days," explained the study, which looked at mining injuries between 1983 and 2006 from the National Institute for Occupational Safety and Health.
Daylight Saving Time started at 3 a.m. on Sunday, March 13. It will end on November 6, 2011.
So, should Arizona change times like the rest of the U.S.? Do you like staying off DST?
Copyright 2011 Scripps Media, Inc. All rights reserved. This material may not be published, broadcast, rewritten, or redistributed.
RIGHT NOW on ABC15.com
Things are warming up again, but we're also tracking the next storm system that may bring rain back to the Valley this week.
The head coach of the youth football team says dad’s overall misconduct on sidelines during games and practices, not just the Facebook post, led to his son’s dismissal.
It's very important that when you hire a contractor, you make sure you have a written contract with payments based on progress.
Have you ever wondered what it's like to be a Phoenix Suns player? Good news! The Suns will be featured in a "live" web special offering real-time, behind the scenes look into a typical day with the NBA team.
Officials have arrested a former coach on sex charges Wednesday in Goodyear.
Officials are investigating a murder-suicide in a Phoenix neighborhood.
A scathing memo from the Phoenix police detective overseeing criminal investigations at Arizona's Child Protective Services department triggered the latest crisis at the agency.
DES Director Clarence Carter made the decision to place five Child Protective Services supervisors on leave pending the results of a probe into thousands of cases that went uninvestigated.
A team investigating thousands of cases ignored by CPS has been working on getting the reports categorized by city so they can utilize the support of local law enforcement agencies.
Jurors deliberating the sentence for Arizona inmate John McCluskey failed to reach a unanimous verdict, meaning the judge will sentence him to life in prison for murdering a retired Oklahoma couple.