Ray:

"From that first Sunday in November through the second Sunday in March we are one hour ahead of those states on Pacific Time, like California and Nevada; one hour behind states in the Central Time zone, such as Texas and Illinois; and only two hours behind those states on Eastern Time, such as New York and Florida." From: http://phoenix.about.com/cs/weather/qt/timezone.htm

So, your time changes relative to DocJohn's because his time changes, not because your time changes, LOL!

When you get lost, just ask the Government, they're here to help you and will know what time it is where: http://www.time.gov/