This was a pain in the butt to make, but now that I'm done:
(WARNING: there is a lot of flicker in this video.)
The source code for the clock is attached. Also attached is a ZIP file containing a library necessary for making the display work. This library is my modification of a library provided by Adafruit Industries for this purpose.
I gave it to my grandmother and it seems she loves it.
For reference, here is an old thread relating to this clock:
http://forum.arduino.cc/index.php?topic=161684
HT1632.zip (5.37 KB)
bclock_with_rtc_f4.ino (20.1 KB)