That is the procedure listed in the manual. However, my car has the clock always showing (it's no longer part of the items that you cycle through) so the manual procedure no longer works...Put key turn on power but not engine. Press the button behind the steering wheel once or twice, this will change what's being displayed. I forgot which one, so just try another one if one doesn't work. Press the same button and hold until you see the hour side of the clock blinking. Then adjust it with the same button, press and hold again to go to the min.
Good luck