Date registered: Aug 2007
Vehicle: '04 SL 500; '05 SLK 350
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Go to the "SYS" menu, chose "date/time"
Now either activate or deacitve automatic updates and automatic DST in the menu.
Press the right button longer than two seconds to save your changes.
If you want to set the time manually scroll to the time (hrs or mins) using the right button. Once the item you want to change is under the cursor, press the right button. The display color of the item changes to red, now you turn the right button again to reach the desired setting and press it again - for more than two seconds - to save what you have changed.
The system should update time and date from the GPS-signal - check your settings first, seems to me something is off with yours.