PHP help with WP Nav Menus

I trying to get some help with a little php code so that my menu will display what I want it to.

I have the exec php plug-in and have been able to call my custom menu up on the page that I wanted it by using:

<?php wp_nav_menu(array(‘menu’ => ‘144’)); ?>

What I want is for the date that I add something to the menu to show up before the tag. I read that you can have some text there, or that you can call the date by setting get_date() to either true or false by adding this (somehow) to what I already have, but I have no idea how to write it.

$before =>

My theme (suffusion) already has each menu item and the ul and li tags wrapped in divs so that I can modify the output any way that I like. Hope this makes sense. Thanks!