GMC 2012 Sierra Denali Owner's Manual page 120

5-10 Instruments and Controls
MP3 Radio with a Six-Disc CD
Player
To set the time and date:
1. Turn the ignition key to ACC/
ACCESSORY or ON/RUN, then
O
press the button to turn the
radio on.
2. Press the MENU button and
then the softkey under the
to display HR, MIN, MM, DD,
YYYY (hour, minute, month, day,
and year).
3. Press the softkey located under
any one of the tabs to change
that setting.
4. To increase the time or date, do
one of the following:
Press the softkey below the
selected tab.
Press the
Press the
Turn the
tab 5. To decrease the time or date, do
one of the following:
Press the
Press the
Turn the
counterclockwise.
To change the time default setting
from 12 hour to 24 hour or to change
the date default setting from month/
day to day/month:
1. Press the MENU button and
SEEK button.
\
FWD button.
2. Press the softkey located below
knob clockwise.
SEEK button.
3. Press the softkey located below
s
REV button.
4. Press the MENU button again to
knob
then the softkey under the
tab.
the forward arrow tab. 12H, 24H,
the date MM/DD (month and
day), and DD/MM (day and
month) displays.
the desired option.
apply the desired option, or let
the screen time out.