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RDATE(8)		FreeBSD	System Manager's Manual		      RDATE(8)

     rdate -- set the system's date from a remote host

     rdate [-46acnopsv]	host

     rdate displays and	sets the local date and	time from the host name	or ad-
     dress given as the	argument.  The time source may be an RFC 5905 protocol
     SNTP/NTP server or	an RFC 868 TCP protocol	server,	which is usually im-
     plemented as a built-in service of	inetd(8).  By default, rdate uses the
     RFC 5905 SNTP/NTP protocol.

     The options are as	follows:

     -4	     Forces rdate to use IPv4 addresses	only.

     -6	     Forces rdate to use IPv6 addresses	only.

     -a	     Use the adjtime(2)	call to	gradually skew the local time to the
	     remote time rather	than just hopping.

     -c	     Correct leap seconds.  This should	be used	only when synchroniz-
	     ing to a server which does	not correctly account for leap sec-

     -n	     Use SNTP (RFC 5905) instead of the	RFC 868	time protocol.	This
	     is	the default.  This protocol counts 32 bits of seconds from
	     January 1,	1900 and will rollover in March	2036.

     -o	     Use an RFC	868 TCP	protocol server	instead	of SNTP.  This proto-
	     col is obsolete as	it is not capable of representing dates	past
	     January 19, 2038 03:14:07 GMT.

     -p	     Do	not set, just print the	remote time.

     -s	     Do	not print the time.

     -v	     Verbose output.  Always show the adjustment.

     /var/log/wtmp  record of date resets and time changes

     To	get the	legal time in Germany, set the /etc/localtime symlink to
     /usr/share/zoneinfo/Europe/Berlin and issue the following command:

	   # rdate -v

     The command of course assumes you have a working internet connection and
     DNS set up	to connect to the server at Physikalisch-Technische
     Bundesanstalt in Braunschweig, Germany.

     date(1), adjtime(2), inetd(8), ntpd(8)

FreeBSD	13.0		       February	10, 2015		  FreeBSD 13.0


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