sub timediff($;$) {
    my $then = $_[0];
    
    my $now;
    if (defined $_[1]) {
       $now = $_[1];
    } else {
       # set $now from system clock
    }

    my $diff;

    # $diff = relative time between $now and $then

    return $diff;
}

##</code><code>##

	sub timediff($) {
		use Time::Piece;
		use Time::Piece::MySQL;
		use Time::Duration;

		my $time = Time::Piece->from_mysql_timestamp( $_[0] );

		my $now = localtime;

		my $diff = ago ($now->epoch() - $time->epoch(), 1);

		return $diff;
	}