[BirdOPrey5]

What this does is not show the timestamp if anyone is logged in is NOT an administrator.

Perhaps you are trying to hide the date on posts that were not made by an administrator for everyone? (Different logic?)

If so that code would be:

if (!is_member_of($post, 6,22))  
{ 
  $post['posttime'] = ' '; 
  $post['postdate'] = ' '; 
}