- date_add: documentation ( source)
- date_create: documentation ( source)
- date_interval_create_from_date_string: documentation ( source)
- date_format: documentation ( source)
<?php
$date = date_create();
$shipping_date = date_add($date,date_interval_create_from_date_string("3 days"));
echo date_format($shipping_date, "m/dd/Y");