US all observe daylight saving time?

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Most US states observe daylight saving time, but Arizona and Hawaii do not. The Navajo Nation, located in northeastern Arizona, follows daylight saving time, while the Hopi Reservation within it and the rest of Arizona do not. The Navajo Nation covers a large area and wanted a standard time for the entire community.

Most Americans are very familiar with the DST routine: Move the clock forward one hour in March so that there is more daylight in the evening to enjoy in the warmest part of the year, and then move it back to November. Most US states observe daylight saving time, but there are exceptions, namely Arizona, Hawaii, and US territories. Arizona calculated that it saves millions on cooling costs by staying on Mountain Standard Time year-round, so the state gave up the federal standard in 1967. However, the Navajo Nation, located in the northeastern corner of Arizona, it follows daylight savings time, making it the only part of Arizona that changes its clocks. The semi-autonomous territory covers 27,425 square miles (71,030 sq km) and extends into parts of Utah and New Mexico, both of which observe daylight saving time. The rationale of the Navajo Nation was that it would be better to have a standard time for the entire Navajo community.

Saving daylight, but not everywhere:

To further complicate matters, the Hopi Reservation, an enclave located entirely within the Navajo Nation, does not observe daylight saving time, just like the rest of Arizona.
Because of Hawaii’s tropical latitude, there isn’t much variation in the amount of daylight between winter and summer, so that state doesn’t change its clocks either.
The Navajo Nation is the largest reservation in the United States, covering an area roughly the size of West Virginia.




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