#!/usr/bin/perl
use strict;
use Tk;
BEGIN {*Tk::Clock::time = sub { time * -1 } }
use Tk::Clock;
my $wm = MainWindow->new;
my $ck = $wm->Clock->pack();
$ck->config(dateFormat => "dd-mm-yyy");

MainLoop;

##</code><code>##

BEGIN {
    my $time = time;
    *Tk::Clock::time = sub { 2 * $time - time };
}