02-23-2011
rdate is real old and obsolete program. Few servers still run the daytime service needed to accommodate it. ntp comes with ntpdate which is a better program.
When you first turn a computer on, you need some way to set the time close to being correct. Then ntpd will correct it the rest of the way. One way is for the computer to have a battery operated clock that runs while the system is off. Most computers have this and it usually is managed automatically by the OS. In Linux we have hwclock to do it and by making it command we have explicit control over the process. In general it's better than nothing and it's worth doing... as a first step.
But then I would try an ntpdate command. The ntp server must be running for this to work. But if it is ntpdate will give a more accurate initial setting. This should be done in the ntp start up script before starting ntpd.
Since everyone runs ntpdate followed by ntpd it makes since to build an option into ntpd to effective do what ntpdate does as it starts. I notice the docs for the latest ntpd suggests that we retire ntpdate. But I still run it anyway...old habits die hard.
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LEARN ABOUT XFREE86
rdate
rdate(1M) System Administration Commands rdate(1M)
NAME
rdate - set system date from a remote host
SYNOPSIS
rdate hostname
DESCRIPTION
rdate sets the local date and time from the hostname given as an argument. You must have the authorization solaris.system.date on the local
system. Typically, rdate is used in a startup script.
The inetd daemon responds to rdate requests. To enable inetd response, the lines invoking the time command in inetd.conf must not be com-
mented out.
USAGE
The rdate command is IPv6-enabled. See ip6(7P).
ATTRIBUTES
See attributes(5) for descriptions of the following attributes:
+-----------------------------+-----------------------------+
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
+-----------------------------+-----------------------------+
|Availability |SUNWrcmdc |
+-----------------------------+-----------------------------+
SEE ALSO
inetd(1M), inetd.conf(4), attributes(5), ip6(7P)
SunOS 5.10 15 Feb 2001 rdate(1M)