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Network Working Group                                          J. PostelRequest for Comments: 867                                            ISI                                                                May 1983Daytime ProtocolThis RFC specifies a standard for the ARPA Internet community.  Hosts onthe ARPA Internet that choose to implement a Daytime Protocol areexpected to adopt and implement this standard.A useful debugging and measurement tool is a daytime service.  A daytimeservice simply sends a the current date and time as a character stringwithout 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-PSTPostel                                                          [Page 1]

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