Try www.clock.org, it has some pretty good documentation on ntp.
I've found ntp pretty easy to set up, I just cp a simple config
setup into /etc/ntp.conf:

---BOF(Beginning of File)---

server          <ntp server 1> prefer
server		<ntp server 2>

# By default, don't let anyone do anything
restrict        default notrust nomodify ignore
restrict        <ntp server 1>   nomodify
restrict        <ntp server 2>   nomodify
# We place no restriction on ourselves.
restrict        127.0.0.1                       # ourselves

# This next line is if you are a server, and want to
# serve time to boxes on <your net> with mask <your mask>
restrict        <your net> mask <your mask> nomodify nopeer notrust

#----- Drift history
driftfile       /etc/ntp.drift

---EOF---

Then you just change

xntpd=YES

in /etc/rc.conf.  Maybe change ntpdate to YES, with the correct hosts...

Everything should then work on boot.  To start after making said changes,
I think that

# xntpd -p /var/run/xntpd.pid

will just do it.  (The '-p ...' is just to put a pid file in /var/run)

 == Roland
 == http://www.imrryr.org/~elric/

On 902872324 seconds since the Beginning of the UNIX epoch
Kevin Ogden wrote:
>
>At 04:57 PM 8/11/98 -0400, Capt. Avram Dorfman wrote:
>>Hello,
>>
>>Is there any better info out there about dealing w/ the clock problem, 
>>besides what's in the macbsd.com FAQ?
>>
>>Has anyone built a how-to on setting up xntpd? the xntpd man pages say 
>>that there's this great config file to set everything up, but then they 
>>refer you to "The Notes on Configuring NTP and Setting up a NTP page". 
>>Where is this page? I'm assuming it's not a man page...
>>
>>My box loses about 45 minutes a day, so I don't think that rebooting it 
>>is a good enough solution...
>>
>
>My machine loses between 45mins and an hour a day on average.  When the
>object is to keep server uptime high, this can become a real problem.
>Losing an hour a day when the average uptime on my machine is usually over
>30 days is not the best thing in the world.  It hasn't been a real issue
>because nothing I do on the machine really needs the correct time although
>correct time/date in e-mail, logs, etc would be cool.  If you find the page
>on setting up xntpd, please let me know :)  
>
>Out of curiosity... what exactly keeps NetBSD/mac68k from keeping correct
>time?  Is the problem simple or extremely complex?
>
>	Kevin Ogden
>