I got! Thanks anyway! The correct code is:
<?php
if ("".((isset($_POST["graduationdate"]))?date("m/d/Y", strtotime($_POST["graduationdate"])):"") ."" >= "".date('m/d/Y', strtotime( "-30 days")) ."") { // WebAssist Show If
?>
Your friends over here at WebAssist! These Dreamweaver extensions will assist you in building unlimited, custom websites.
These out-of-the-box solutions provide you proven, tested applications that can be up and running now. Build a store, a gallery, or a web-based email solution.