Need a bit of help with setting the time zone on the clock
 

I have a new to me 2008 Corvette, and I can't seem to get the original time zone off of the radio. I have entered the correct time zone in the settings, and as long as I don't turn off the car, it stays correct but the next time I turn it on, the old information appears. This puts the time 2 hours later than it is.
What am I doing wrong? I disconnected the battery yesterday so I could reset all of the settings.:confused:

Thanks
Rick

Apparently I posted this in the wrong spot, could a moderator please delete it for me, I have reposted it in I believe, the proper place