.\"	$OpenBSD: rdate.8,v 1.16 2002/05/16 20:10:15 stevesk Exp $
.\"	$NetBSD: rdate.8,v 1.4 1996/04/08 20:55:17 jtc Exp $
.\"
.\" Copyright (c) 1994 Christos Zoulas
.\" All rights reserved.
.\"
.\" Redistribution and use in source and binary forms, with or without
.\" modification, are permitted provided that the following conditions
.\" are met:
.\" 1. Redistributions of source code must retain the above copyright
.\"    notice, this list of conditions and the following disclaimer.
.\" 2. Redistributions in binary form must reproduce the above copyright
.\"    notice, this list of conditions and the following disclaimer in the
.\"    documentation and/or other materials provided with the distribution.
.\" 3. All advertising materials mentioning features or use of this software
.\"    must display the following acknowledgement:
.\"	This product includes software developed by Christos Zoulas.
.\" 4. The name of the author may not be used to endorse or promote products
.\"    derived from this software without specific prior written permission.
.\"
.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
.\" IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
.\" OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
.\" IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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.\" NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
.\" DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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.\"
.Dd April 30, 1994
.Dt RDATE 8
.Os
.Sh NAME
.Nm rdate
.Nd set the system's date from a remote host
.Sh SYNOPSIS
.Nm rdate
.Op Fl npsa
.Ar host
.Sh DESCRIPTION
.Nm
displays and sets the local date and time from the
host name or address given as the argument.
The time source may be an RFC868 TCP protocol server,
which is usually implemented as a built-in service of
.Xr inetd 8 ,
or an RFC1361 protocol SNTP/NTP server.
By default,
.Nm
uses the RFC868 TCP protocol.
.Pp
The options are as follows:
.Bl -tag -width Ds
.It Fl n
Use SNTP (RFC1361) instead of the RFC868 time protocol.
.It Fl p
Do not set, just print the remote time.
.It Fl s
Do not print the time.
.It Fl a
Use the
.Xr adjtime 2
call to gradually skew the local time to the
remote time rather than just hopping.
.Sh FILES
.Bl -tag -width /var/log/wtmp -compact
.It Pa /var/log/wtmp
record of date resets and time changes
.El
.Sh SEE ALSO
.Xr adjtime 2 ,
.Xr gettimeofday 2 ,
.Xr inetd 8