CLK, a Beautiful (!) Big Digital Clock, by Dave Marsh.
Documentation by Joe Horn.

Load and attach this library.  It adds the command CLOCK to the HP 48.

To exit the clock, press any key.

The beautiful digits were downloaded from a MacIntosh.

The screen disolve effect was written by Joe Ervin; see DISS on this disk.

Note: use this program to impress friends, but not as a long-running
clock, or you'll drain your batteries in no time.  It doesn't go into
idle (low-drain) mode between display updates.  Anybody want to rewrite
it using a repeating alarm?