> > ... or you could add rdate to rc.local or write a custom rc.d script > > for yourself. > > You can also use cron for this, e.g. > > @reboot /usr/sbin/rdate -n ntp_server
Don't do that. It is very bad practice. After all the daemons have started, it suddenly jumps the time. Forwards or backwards. You don't know.
