Where the text needs to appear put this code

<?=date('F d Y', time()+259200)?>

259200 is the number of seconds in 3 day, so thats what has to be changed if needed

Also make sure that the webpage you use that on is a .php page

EDIT: Also if you want to change how the date is displayed, heres the documentation for the date function

http://us.php.net/manual/en/function.date.php

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