Everytime i reset the clock, it works fine, but when i shut the car off and then restart the car it goes back to 1 o'clock. don't know why it won't stay set to the time i put in

Sounds like the "power switch" is defective...(sticking) Try leaving the power to the radio on when you shut off your Seville...if this works great...there is no extra power drain...if this does not work...then it is cheapest to replace the radio...or if you want to maintain the AC Delco factory radio...there are a few web sites that advertise complete repair for AC Delco radios as low as $125....Hope this helps...:)