[1] “Daylight Savings Time explained”, CGP Gray. https://youtu.be/84aWtseb2-4. Skip to the 5 minute mark for Arizona.
Is Navajo Nation technically in Arizona, though?
For some purposes yes, for others no. The state has jurisdiction in matters not involving the tribe that take place there and the residents can vote / participate in civil government as Arizonians. However, the nation does have sovereignty in tribal affairs on the reservation and a few outside it.