RDATE(8) BSD System Manager's Manual RDATE(8)
rdate - set the system's date from a remote host
rdate [-346adnprsv] [-P ntpport] host
rdate displays and sets the local date and time from the host name (or
address) given as the argument. The time source may be an RFC 868 TCP
protocol server, which is usually implemented as a built-in service of
inetd(8), or an RFC 2030 protocol SNTP/NTP server. By default, rdate uses
the RFC 868 TCP protocol.
The options are as follows:
-3 Sets the NTP protocol version to 3.
-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 match the
remote time rather than just hopping.
-d Debug the SNTP exchange. If given twice, debug each packet received.
-n Use SNTP (RFC 2030) instead of the RFC 868 time protocol.
-P ntpport
With -n, use the UDP port ntpport instead of the default 123.
-p Do not set, just print the remote time.
-r Show the remainder from the last adjtime(2) call.
-s Do not print the time. Overrides any previous -v options.
-v Verbose output. Always show the adjustment. Put this on a command
line to reset all previous -s options.
/var/log/wtmp record of date resets and time changes
date(1), adjtime(2), crontab(1), gettimeofday(2), symlink(7), inetd(8),
ntpd(8), timed(8)
MirBSD #10-current November 19, 2020 1