User Account Deactivation

We are thinking of using WP as a communications portal/intranet at the non-profit I work for. One of the key things I need to be able to use is a user management tool that will allow me to set user accounts to be deactivated or closed on a certain date. Basically, we have volunteers that come in and work for us for anywhere from a day to a few weeks. Can I create a user account and specify on which day/date it will expire/deactivate? Thanks in advance!