Until laws were standardized in 2006, things were even more complicated in Indiana. The Arizona portion of the Navajo Nation is, therefore, sometimes called the Daylight Saving Donut: a ring of noon surrounded both outside and inside by 11 a.m. The Hopi, like the rest of Arizona, have no reason to switch to daylight saving time, so they donвЂ™t. But hereвЂ™s the tricky part: The Navajo nation completely surrounds the smaller Hopi Reservation, which is entirely within Arizona. ItвЂ™s the only part of Arizona that changes its clocks in the summer. Rather than putting neighboring Navajo communities on two different clocks, the reservation has elected to adopt daylight saving time even though most of their land lies within Arizona. The Navajo Nation, however, includes parts of two states that do observe summer time. Arizona saves millions of dollars in cooling costs by staying on Mountain Standard Time year-round. Giving Arizonans more sunlight in the summer is like donating water to the passengers aboard the sinking Titanic: TheyвЂ™ve already got plenty, thanks. That makes it by far the largest Native American jurisdiction in the country, covering the entire Four Corners area, including parts of Utah and New Mexico.ДЄrizona hasnвЂ™t observed Daylight Saving Time since 1967, mostly due to energy conservation.

The reservation covers 27,425 square miles, an area larger than West Virginia. The northeast corner of Arizona belongs to the Navajo Nation.

Arizona time zones