The server then sends the time as a 32-bit unsigned integer in binary format and in network byte order, representing the number of seconds since 00:00 (midnight) 1 January, 1900 GMT, and closes the connection.
The fixed 32-bit data format means that the timestamp rolls over approximately every 136 years, with the first such occurrence on 7 February 2036.
Programs that use the Time Protocol must be carefully designed to use context-dependent information to distinguish these dates from those in 1900.
Many Unix-like operating systems used the Time Protocol to monitor or synchronize their clocks using the rdate utility, but this function was superseded by the Network Time Protocol (NTP) and the corresponding ntpdate utility.
On most UNIX-like operating systems a Time Protocol server is built into the inetd (or xinetd) daemon.