date@ — prints the date on a remote host.
date@ uses tcpclient(1) to connect to TCP port 13 on
host and prints any data that it receives.
It uses delcr(1) and cat(1) to remove CR (\015) and convert unprintable characters to a visible format.
host is not supplied, date@ connects to the local host.
TCP port 13 is the well-known port for the Daytime service.
Some computers respond to connections on this port with a human-readable date.
For example, they may be running
tcpserver -R -H -l0 0 13 date using tcpserver(1).