Simple demonstration of self refreshing Tk window using the system clock. I'd love to improve this to query a few NTP servers so that I can get the correct time even on a computer where I don't have admin rights and can't set up a full NTP client.
#!perl -w
use strict;
use Tk;

my $mw=MainWindow->new(-title=>'Time');
my $cv=$mw->Canvas(-height => 25, -width => 150)->pack;
my $i=0; 
my $l=undef;

sub t 
{
    $cv->delete( $l ) if defined $l; 
    $l = $cv->create( 'text', 75, 15, -text => scalar( localtime( time
+() ) ) );
}

$cv->repeat( 250, \&t, $cv ); 

MainLoop

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In reply to Simple Tk Clock by Anonymous Monk

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