Sunday marks the beginning of Daylight Saving Time for 2019. Most of Arizona won’t have to worry about moving its clocks ahead an hour, but if you live up on the Navajo Nation, you do. So starting Sunday morning, people on the reservation will be ahead an hour than the rest of the state. The Navajo Nation goes on Daylight Saving Time to stick with the rest of their territory in other states. For those of us off the reservation, just go to bed Saturday night and use your clock as you would normally with no changes.