RFC 850 (obsoleted by 1036)
ditto but no tz. Happens too often
RFC 822/1123
REMIND what rfc? Apache/1.1
REMIND what rfc? Apache/1.1
REMIND what rfc? Apache/1.1
REMIND what rfc? Apache/1.1
Date's string output format
ANSI C asctime format()
No time zone 2 digit year RFC 1123
No time zone RFC 822/1123