The clock can be configured for "American" (12 hr) time and date or "European" (24hr) time and date. This setting is stored permanently in EEPROM.
In 12hr mode, be sure to look for the 'dash' on the left hand side of the display to indicate PM when setting the time and alarm. Also note that when setting the date, the date will be displayed in MM-DD-YY format.
In 12hr mode, there will be no 'dash' on the left hand side as time and alarm will be in 24 hr format. Also note that when setting the date, the date will be displayed in DD-MM-YY format.
Press the MENU button until Set regn is displayed.
Now press the SET button to change the region.
If the region is USA/12hr you will see the following: