2009 Buick Enclave Owner's Manual - Page 188

3-70 Instrument Panel Changing the Time and Date Default Setting To change the time default setting from 12 hour to 24 hour or to change the date default setting from month/day/year to day/month/year: 1. Press G and then the pushbutton located under the forward arrow that displays on the radio screen until the time 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 G again to apply the selected default, or let the screen time out. Radio(s) Radio with CD