Ok, got it.
In date_to_unix
$new_date = ($time + 86400);
then in get_date
my ($sec, $min, $hour, $day, $mon, $year, $dweek, $dyear, $daylight) = localtime($new_date );
In date_to_unix
$new_date = ($time + 86400);
then in get_date
my ($sec, $min, $hour, $day, $mon, $year, $dweek, $dyear, $daylight) = localtime($new_date );