title: LDAP filter : getting only users updated since given date
body: <p>I have trouble setting up an Active Directory filter to synchronize a MySQL database containing all my users. And I can not create a filter that only retrieves users with an update date greater than a given date.</p>
  
  <p>I tried using uSNChanged attribute on my filter but it returns me 0 result. </p>
  
  <p>Any suggestion is welcome thanks to all</p>