USA & Canada clocks
Daylight Saving Time dates 2013
Sunday 10 March 2013 2am local time
until Sunday 3 November 2013 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).
After the Summer months the time is shifted back by 1 hour
resulting in the normal 7 hours difference behind GMT.