Arizona's Time Choice
Why Does Arizona Stay on Mountain Standard Time (MST) All Year?

Discover why Arizona does not observe Daylight Saving Time and stays on MST year-round for energy savings and climate reasons.

Arizona's Time System
How Does Arizona Time Work Without Daylight Saving Time?

Learn why Arizona mostly stays on Mountain Standard Time year-round and how the Navajo Nation observes Daylight Saving Time.

Arizona Time Zone
What Time Zone Is Arizona In? Understanding MST and Navajo Nation Exceptions

Learn about Arizona's time zone, its year-round use of MST, and the Navajo Nation's daylight saving time observance.