Sunday 8 March 2015 2am local time
until Sunday 1 November 2015 2am local time
see: Daylight-Saving-Time.com for details
USA and Canada Standard Time Date schedules here
Arizona is in the Mountain Time Zone in the United States, which is 7 hours behind Greenwich Mean Time (GMT).
The Navajo Nation Community of Arizona observes Daylight-Saving Time, where the time is shifted forward by 1 hour, resulting in a 6 hours difference behind GMT. The Hopi Nation, within the Navajo Reservation, does not operate time changes .
After the Summer months the time is shifted back by 1 hour resulting in the normal 7 hours difference behind GMT.