OK, you could create a plugin using hook location
postbit_display_complete and code like this:
PHP Code:
$post['day'] = vbdate('l', $post['dateline']);
$post['month'] = vbdate('F', $post['dateline']);
$post['year'] = vbdate('Y', $post['dateline']);
and then in the template use {vb:raw post.day}, {vb:raw post.month}, and {vb:raw post.year}.
To see what the 'l', 'F', and 'Y' mean and what other things you could put there, see this page in the php manual:
http://us2.php.net/manual/en/function.date.php
If you haven't created a plugin before, see the vb manual here:
https://www.vbulletin.com/docs/html/main/add_plugin