Hi, yeah, I've adopted tk-clock along time ago for my clock. I have a very minimalist desktop, and all I wanted was a tiny digital clock in the lower right hand corner. It also stays on top across my 10 virtual desktops. I've shown how to cut off the date too. I have a 1024x768 desktop, so you may have to adjust the geometry for your desktop.
#!/usr/bin/perl
use Tk;
use Tk::Clock;
my $m = MainWindow->new();
#$m -> geometry("70x30+930+740"); #with date
$m -> geometry("70x15+940+755"); #no date
$m->overrideredirect(1); #no xterm decorations
my $c = $m->Clock (-background => "Black");
$c->config (
useAnalog => 0,
useDigital => 1,
# tickColor => "Orange",
# handColor => "Red",
# secsColor => "Green",
timeColor => "lightBlue",
# timeFormat => "hh:MM A",
timeFormat => "HH:MM:SS",
# dateColor => "Gold",
# dateFormat => "m/d/y",
timeFont => "-misc-fixed-medium-r-normal--13-*-75-75-c-*-iso8859-
+1",
);
$c->pack;
MainLoop;