Mon, Apr 26, 2010 
D, M j, Y

Apr 26 '10 
M j 'y

04/26/2010 
m/d/Y

In drupal, you can configure custom formats at:
http://yourdomain.com/admin/settings/date-time/formats/add

You can also use these in a custom php function like:
<?php>created, 'custom', "F jS, Y"); ?>

To look up more options see http://php.net/manual/function.date.php

Common Custom PHP Date Formats

date

Other