Here's unique bit of additional information about time zones, and Daylight Saving Time, in Arizona.
As noted at WebExhibits:Daylight Saving Time [with minor editing, emphasis, added links, by myself]:
Quote:In the U.S., Arizona doesn’t observe Daylight Saving Time, but the Navajo Nation (parts of which are in three states [AZ, UT and NM]) does.
However, the Hopi Reservation, which is entirely surrounded by the Navajo Nation, follows the State of Arizona in using Mountain Standard Time and not observing DST. In effect, there is a donut-shaped area of Arizona that does observe DST, but the “hole” in the center does not.
Just to make this a bit more interesting, there is