This system only supports the 24-hour mode. 1. In standby mode, press and hold CLOCK on the remote until the time flashes on the display. 2. Turn VOLUME -/+ clockwise or anticlockwise, or press VOLUME +/- on the remote to set the hour. 3. Press CLOCK to confirm. 4. Repeat steps 2-3 to set the minutes. The clock setting will be erased when the system is disconnected from the power supply.