You can choose to have the display show the time in 12-hour (AM/PM) or 24-hour time.
To change the time format, follow these steps:
on the remote, press and hold alarm setup/menu until "-setup menu-" is displayed
press tune/playlist > three times until "time-" is displayed
press time - or time + to select "12 hour" or "24 hour"
press alarm setup/menu to exit the setup menu or wait 10 seconds for the setup menu to exit automatically