On Sunday, America moves its clocks forward in an effort to save daylight.

But not in Arizona. Clocks will remain untouched as daylight saving time officially starts.

The Grand Canyon State is just fine where it is as the nation springs ahead.

That's because Arizona already has plenty of daylight. And when temperatures climb above 100, the state will wish it had daylight-spending time, urging the world to spin faster and return to the more comfortable dark side of Earth.

For a half century, Arizona — but not including the Navajo reservation — has refused to perform the standard to-daylight-saving-and-back-again dance. In 1968, the state legislature decided it was best for Arizona to opt out of the Uniform Time Act of 1966, which mandated the saving of daylight.

The move meant that on 115-degree days in July, the sun would set at 7:40 p.m. MST rather than 8:40 p.m. MDT, avoiding nightly pleas from kids to stay up later because it's too bright (and hot) to go to bed.

Most of Arizona has remained a loyal Mountain Standard Time state ever since. As a result, it's singled out on the time-setting sub-menus for phones and other smart devices. While other states are lumped into time zones, the Grand Canyon State stands alone. #locktheclock