Tk Update

[dabella12]

Hello Monks I need a little help :) I'm writing a script that needs to update a label with the current time. here is the code I'm using but it doesn't work

#!/usr/bin/perl
use strict;
use warnings;
use diagnostics;
use Tk;
use Date::Manip;
my $time=&UnixDate('now',"The time is: %r on %B %d, %Y");
my $mw=MainWindow->new(-title=>'Time Test');

my @top = qw/-side top -fill both -padx 2 -pady 2 -expand 1/;
my @left = qw/-side left -fill both -padx 2 -pady 2 -expand 1/;
my $frm=$mw->Frame(-bd =>2);
my $frm1=$mw->Frame(-bd =>2);
my $oper=$frm->Button(
    -text      => "Entrada De Operaciones",
    -command   => sub{print "Hello World\n"},
);
my $client =$frm->Button(
    -text      => 'Informe De Clientes',
    -command   => sub{print "Hello World\n"},
);
my $general =$frm->Button(
    -text      => 'Informe General',
    -command   => sub{print "Hello World\n"},
);
my $util =$frm->Button(
    -text      => 'Utilidades',
    -command   => sub{print "Hello World\n"},
);
my $exit =$frm->Button(
    -text      => 'Exit Application',
    -command   => sub{exit},
);
my $lb=$mw->Label(-text=>\&update_time)->pack(@top);
$frm->pack(@top);
$oper->pack(@top);
$client->pack(@top);
$general->pack(@top);
$util->pack(@top);
$exit->pack(@top);
MainLoop;

sub update_time {
    $time=&UnixDate('now',"The time is: %r on %B %d, %Y");
    print "$time\n";
    $lb->configure(-text=>"$time");
    $mw->update;
    $mw->after(1);
}

This doesn't work for some reason.