How do you set clock on 2004 mercury grand marquis?

To set the clock on a 2004 Mercury Grand Marquis, turn the ignition to the "On" position without starting the engine. Press and hold the "Clock" button until the display starts flashing. Use the "Tune" or "Seek" buttons to adjust the hours and minutes, then press the "Clock" button again to save the settings. Make sure to check and adjust for AM/PM if necessary.