What kind of timestamp you're talking about? There's always java.sql.Timestamp and System.currentTimeMillis() (In any case, I doubt it has anything to do with Security so someone will probably move this post somewhere else)
HTTP Digest Authentication: Random value that is unique created by the server . (Clients IP address,followed by a timestamp and then a random chunk of data created by the server. ) This what i was looking for (System.currentTimeMillis()) Thanks.