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+NWG/RFC# 738                                         KLH 31 Oct 77 42218
+Network Working Group                                     K. Harrenstien
+Request for Comments: 738                                         SRI-KL
+NIC: 42218                                               31 October 1977
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+                              Time Server
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+This note describes the Time Server protocol, as currently implemented
+on ITS hosts (i.e. MIT-(AI/ML/MC/DMS)).  The idea is to provide a
+site-independent, machine readable date and time in as efficient and
+swift a manner as possible; its motivation arises from the fact that not
+all systems have a date/time clock, and all are subject to occasional
+human or machine error.  The use of time-servers makes it possible to
+quickly confirm or correct a system's idea of the time, by making a
+brief poll of several independent sites on the network.
+
+In particular the network time server works as follows:
+
+   S: Listen on socket 37 (45 octal).
+
+   U: Connect to socket 37 [not ICP].
+
+   S: Send the time as a 32 bit binary number.
+
+   U: Close the connection.
+
+   S: Close the connection.
+
+Note that this is not a normal ICP sequence.  Rather, instead of sending
+a 32-bit socket number to reconnect to, the server returns a 32-bit time
+value and closes the connection.  If the server is unable to determine
+the time at its site, it should either refuse the connection or close it
+without sending anything.
+
+The time is the number of seconds since 0000 (midnight) 1 January 1900
+GMT, such that the time 1 is 12:00:01 am on 1 January 1900 GMT; this
+base will serve until the year 2036.  As a further example, the most
+recent leap year as of this writing began from the time 2,398,291,200
+which corresponds to 0000 1 Jan 1976 GMT.
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+                                                                [Page 1]
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