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INTERNET STANDARD

Network Working Group                                          J. Postel
Request for Comments: 867                                            ISI
                                                                May 1983
                            Daytime Protocol
This RFC specifies a standard for the ARPA Internet community.  Hosts on
the ARPA Internet that choose to implement a Daytime Protocol are
expected to adopt and implement this standard.
A useful debugging and measurement tool is a daytime service.  A daytime
service simply sends a the current date and time as a character string
without regard to the input.
TCP Based Daytime Service
   One daytime service is defined as a connection based application on
   TCP.  A server listens for TCP connections on TCP port 13.  Once a
   connection is established the current date and time is sent out the
   connection as a ascii character string (and any data received is
   thrown away).  The service closes the connection after sending the
   quote.
UDP Based Daytime Service
   Another daytime service service is defined as a datagram based
   application on UDP.  A server listens for UDP datagrams on UDP port
   13.  When a datagram is received, an answering datagram is sent
   containing the current date and time as a ASCII character string (the
   data in the received datagram is ignored).
Daytime Syntax
   There is no specific syntax for the daytime.  It is recommended that
   it be limited to the ASCII printing characters, space, carriage
   return, and line feed.  The daytime should be just one line.
      One popular syntax is:
         Weekday, Month Day, Year Time-Zone
         Example:
            Tuesday, February 22, 1982 17:37:43-PST
Postel                                                          [Page 1]

---

RFC 867                                                         May 1983
Daytime Protocol
      Another popular syntax is that used in SMTP:
         dd mmm yy hh:mm:ss zzz
         Example:
            02 FEB 82 07:59:01 PST
NOTE:  For machine useful time use the Time Protocol (RFC-868).
Postel                                                          [Page 2]