$d1 = '05-02-2003 10:30:44';
$d2 = '06-02-2003 11:31:47';

my ( $days, $hours, $mins, $secs ) = delta_date( $d1, $d2 );;
die "Auction expired" unless defined $secs;
print format_time_remaining( $days, $hours, $mins, $secs), 'remaining';

sub delta_date {
    use Time::Local;
    my ($start, $end) = @_;
    my($d,$m,$y,$h,$min,$s) = split /[- :]/, $start;
    my $start_sec = timegm($s, $min, $h, $d, $m-1, $y);
    ($d,$m,$y,$h,$min,$s) = split /[- :]/, $end;
    my $end_sec = timegm($s, $min, $h, $d, $m-1, $y);
    my $diff = $end_sec - $start_sec;
  return undef if $diff < 0;
    my $days = int( $diff / (24*3600) );
    $diff -= $days * 24*3600;
    my $hours = int( $diff / (3600) );
    $diff -= $hours * 24*60;
    my $mins = int( $diff/ 60 );
    $diff -= $mins * 60;
  return $days, $hours, $mins, $diff;
}

sub format_time_remaining {
    ($days, $hours, $mins, $secs) = @_;
    my $str = '';
    $str .= $days  . ' day'    . (($days ==1 )  ? ', ' : 's, ');
    $str .= $hours . ' hour'   . (($hours == 1) ? ', ' : 's, ');
    $str .= $mins  . ' minute' . (($mins == 1)  ? ', ' : 's, ');
    $str .= $secs  . ' second' . (($secs == 1)  ? ' '  : 's ');
  return $str; 
}