Nobu NBFS-48IDU Service Manual page 10

Setting of Present Time
This remote controller has the clock function and time setting is available: 1 Remove the back cover of remote
controller and press "CLOCK" button, and it displays "0: 00", Press "HOUR" button once to increase 1 hour,
After setting the hour, press "MIN" button once to increase 1 minute,
After setting, press "CLOCK" button again to complete setting. To set again, repeat the above steps.
When the remote controller doesn't work, press "RESET" button to cancel the display.