1. Press the Menu button on your steering wheel.
2. Use the arrow keys to select Settings.
3. Press the OK button.
4. Select Clock.
5. Press the Set button.
6. Use the arrow keys to set the time.
7. Press the OK button.
8. The clock will be reset.
Alternatively, you can also reset the clock by using the Audi A3's voice control system:
1. Press the Voice button on your steering wheel.
2. Say "Set clock".
3. The system will ask you for the time.
4. Say the time out loud.
5. The clock will be reset.