2003 Mercedes Benz SL55

Electrical problem
2003 Mercedes Benz SL55 V8 Two Wheel Drive Automatic 34600 miles

The Digital Clock in the dash is working. The incorrect time is displayed. To correct the time I'm told you have to do it through the Mercedes Comand Center. A previous owner of this car removed the comand center and had an aftermarket system installed. Is there any way to correct the time in my Digital Clock?
June 12, 2010.

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