D. J. Bernstein
TCP/IP
ucspi-tcp

The date@ program

date@ prints the date on a remote host.

Interface

     date@ host
date@ connects to TCP port 13 (Daytime) on host and prints any data it receives. It removes CR (\015) and converts unprintable characters to a visible format.

If host is not supplied, date@ connects to the local host.

Some computers respond to port 13 with a human-readable date. For example, they may be running 

     tcpserver -RHl0 0 13 date
using tcpserver.