One of the great things about the Nokia N9 is the AMOLED screen with its low power mode. Unfortunately, it only shows the current time, and not the current date. Billboard is here to fix this - and add some more goodies along the way!
If you have problems with the Billboard display, please uninstall Billboard and re-install it and after that, the problem will be fixed. Alternatively (if you are comfortable with the command line) you can follow the manual instructions.