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rfc:rfc867

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]

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