2010 GMC Savana 2500 Cargo Owner's Manual - Page 208

Changing the Time and Date Default Settings To change the time default setting from 12 hours to 24 hours or change the date default setting from month/day/year to day/month/year. To change the time or date default settings, follow these instructions: 1. Press the MENU button. Once the H option displays, press the pushbutton located under the forward arrow that is currently displayed on the radio screen until the 12H (hour) and 24H (hour), and the date MM/DD (month and day) and DD/MM (day and month) displays. 2. Press the pushbutton located under the desired option. 3. Press the MENU button again to apply the selected default, or let the screen time out. Radio(s) AM-FM Radio shown, Radio with CD (Base) similar 4-62