Add a number of days to a date, with PHP
This simple example written in PHP, it shows how to add a number of days to a date.
<?php
// Set timezone
date_default_timezone_set('Europe/London');
$today = date('d/m/Y');
// Add 3 days to a date (today)
$n = 3;
$new_date = date('d/m/Y', time() + ($n * 24 * 60 * 60));
echo $today;
echo "<br />";
echo $new_date;
?>