Changes for RFC1252https://datatracker.ietf.org/doc/rfc1252/history/1991-08-09T07:00:00+00:00History of change entries for RFC1252.[(System)] Document has expired [rev. 04]1991-08-09T07:00:00+00:00(System)https://datatracker.ietf.org/doc/rfc1252/history/#history-17074Document has expired[(System)] RFC published [rev. 04]1991-08-01T07:00:00+00:00(System)https://datatracker.ietf.org/doc/rfc1252/history/#history-265056RFC published