2007 GMC Yukon Owner's Manual - Page 278

Changing the Time and Date Default Settings You can 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 the instructions below: 1. Press the MENU button. Once the clock option is displayed, press the pushbutton located under that label. The 12H and 24H, and the date MM/DD/YYYY (month, day, and year) and DD/MM/YYYY (day, month, and year) will appear on the display. 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 with CD (MP3) Radio with CD shown, Radio with Six-Disc CD (MP3) similar 278