Mlclock is the best clock for the mlvwm window manager.
HOW TO USE
Copy /usr/X11R6/share/mlclock/mlclockrc file to your home
directory as ".mlclockrc"
(or specifyed name in Imakefile).
Then, add following line into .mlvwmrc.
Swallow "MLClock" Action Exec "mlclock" exec mlclock
that's all.
WWW: http://www2u.biglobe.ne.jp/~y-miyata/mlvwm.html