Accu-Chek Compact Plus Manuel De L'utilisateur page 63

Press the M button repeatedly, or press and hold it down, until the
required hour is displayed.
Press the S button to save the chosen setting.
The minute setting comes next.
The minutes flash at top left of the display.
24-hour
format
12-hour
format
Press the M button repeatedly, or press and hold it down, until the
required minutes are displayed.
Press the S button to save the chosen setting.
Settings
3
63