title: Django: get last user visit date
body: <p>In Django, we can get the time user last logged in by using <code>Auth.User.last_login</code>.  That is only updated when the user logs in using his username/password.  Suppose the user is already logged in and the authentication information is saved in a cookie, therefore is able to access the site without logging in.  How can we get the date the user previously visited the site?  This would be useful for queries such as getting the number of new records since the last visit.</p>