Step 1: Press the "Menu" button on the steering wheel.
Step 2: Use the arrow keys to navigate to the "Settings" menu, and press the "OK" button.
Step 3: Select the "Clock" option, and press the "OK" button.
Step 4: Use the arrow keys to adjust the hour and minute, and press the "OK" button.
Step 5: Select the "Date" option, and press the "OK" button.
Step 6: Use the arrow keys to adjust the day, month, and year, and press the "OK" button.
Step 7: Press the "Menu" button to exit the settings menu.
Note: The clock on some Mercedes Benz C Class models can also be adjusted through the central display. The steps for adjusting the clock through the central display may vary depending on the specific model.