I don't believe there is a way to have the time display as 12 hour AM/PM. See the Owner's Manual on Pages 32 and 33.
<edit> Upon inspection of the display and icons, there is not enough room to "paint" hh:mm AM/PM on the display without moving the top row of icons around. The scan/search direction arrow appears immediately to the right of the 24 hour time hh:mm stamp.