Check page 17 in the "M1G Installation and Programming Guide":
Menu 8 consists of 8 sub-menus used for advanced system settings. Press the right arrow key
and enter a valid user code. Press the UP or DOWN arrow keys to select a sub-menu or enter
the one digit number to jump directly to any sub-menu. I.E. enter 6 to jump to 86.
To set the system clock press the RIGHT arrow key, then press the UP or DOWN arrow key to
select the day. Next, press the RIGHT arrow key to move to Date/Time setting. Enter two digits
for month, date, year, hour, and min. To exit press the * key.