7. Setting the Clock on the AWM910 stereo: Press T/F (6) to display the clock. Press and hold T/F, and the clock display will flash. While holding T/F, press H (7a) to adjust the hour or M (7b) to adjust the minute. The new time will be saved five seconds after the last adjustment is made.
Below is a link to the full manual too.https://www.rvupgradestore.com/v/vspfiles/assets/pdf/AWM910_Manual.pdf