1.\" $NetBSD: rdate.8,v 1.14 2017/08/27 20:45:47 wiz Exp $ 2.\" 3.\" Copyright (c) 1994 Christos Zoulas 4.\" All rights reserved. 5.\" 6.\" Redistribution and use in source and binary forms, with or without 7.\" modification, are permitted provided that the following conditions 8.\" are met: 9.\" 1. Redistributions of source code must retain the above copyright 10.\" notice, this list of conditions and the following disclaimer. 11.\" 2. Redistributions in binary form must reproduce the above copyright 12.\" notice, this list of conditions and the following disclaimer in the 13.\" documentation and/or other materials provided with the distribution. 14.\" 15.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 16.\" IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 17.\" OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 18.\" IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 19.\" INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 20.\" NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 21.\" DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 22.\" THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 23.\" (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 24.\" THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 25.\" 26.Dd August 26, 2017 27.Dt RDATE 8 28.Os 29.Sh NAME 30.Nm rdate 31.Nd set the system's date from a remote host 32.Sh SYNOPSIS 33.Nm 34.Op Fl 46aps 35.Ar host 36.Sh DESCRIPTION 37.Nm 38displays and sets the local date and time from the 39host name or address given as the argument. 40It uses the RFC 868 protocol which is usually implemented as a 41built-in service of 42.Xr inetd 8 . 43.Pp 44Available options: 45.Bl -tag -width indent 46.It Fl 4 47Forces 48.Nm 49to use IPv4 addresses only. 50.It Fl 6 51Forces 52.Nm 53to use IPv6 addresses only. 54.It Fl a 55Use the 56.Xr adjtime 2 57call to gradually skew the local time to the 58remote time rather than just hopping. 59.It Fl p 60Do not set, just print the remote time 61.It Fl s 62Do not print the time. 63.El 64.Sh FILES 65.Bl -tag -width /var/log/wtmp -compact 66.It Pa /var/log/wtmp 67A record of date resets and time changes. 68.El 69.Sh SEE ALSO 70.Xr adjtime 2 , 71.Xr gettimeofday 2 , 72.Xr utmp 5 , 73.Xr inetd 8 74