Daylight Savings (US)

That's what I thought until I Google'd

Arizona (with the exception of the Navajo Nation) and Hawaii and the territories of Puerto Rico, Virgin Islands, Guam, and American Samoa are the only places in the U.S. that do not observe DST but instead stay on "standard time" all year long. And if you've spent any time in the sweltering summer sun in those regions you can understand why residents don't need another hour of sunlight.

http://www.infoplease.com/spot/daylight1.html

Arizona does not observe Daylight Saving Time (March through November). We do not "spring Forward" in Phoenix -- we always stay on Mountain Standard Time. During Daylight Saving Time (DST) most of Arizona is at the same time as California (Pacific Daylight Time or PDT).

http://phoenix.about.com/cs/weather/qt/timezone.htm

So I am guessing instead of doing DST, they switch time zones (Mountain to Pacific, and vice versa).
 
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