2005 Mazda Tribute

My sister has a 2005 Mazda Tribute.

She is trying to change the clock to read the time

and no matter what obvious buttons she chooses,

the time results in MILITARY TIME.( Example 17:00 hours.)

She has checked the owners manual several times over

with no change.

If anyone out there knows the step-by-step procedure for a

solution to this problem, it would greatly be appreciated.