Chevrolet 2010 Impala Owner's Manual page 204

This radio has a button for setting the time.
To set the time:
1. Press the button until the hour begins flashing
on display. Press
minutes begin flashing on display.
2. To increase or decrease the time, do one of the
following while the hours or minutes are flashing:
Turn the knob.
Press SEEK or
Press FWD or
3. Press the button again until the clock display
stops flashing to set the currently displayed time,
or wait five seconds until the flashing stops and the
current time displayed is automatically set.
4-58
a second time and the
SEEK.
REV.
To change the time default setting from 12 hour to
24 hour, press the button until 12H or 24H is
displayed. Once 12H or 24H is displayed, turn
the knob to the desired option to select the setting.
Press the button again to apply the setting, or let the
screen time out.
This radio has a button for setting the time.
To set the time and date:
1. Turn the radio on.
2. Press the button and the HR, MIN, MM, DD,
YYYY (hour, minute, month, day, and year)
displays.
3. Press the pushbutton located under any one of the
tabs to be changed.