This is easy.
Here are the steps (all done as root):
1. Copy /etc/inet/ntp.server to /etc/inet/ntp.conf, and then edit ntp.conf to comment out the “server” and “fudge” lines. Add a line to the bottom of the file,
server timeservername
Like,
server tick.usno.navy.mil
2. Create a drift file,
touch /var/ntp/ntp.drift
3. Initialize the ntpd service,
svcadm enable svc:/network/ntp
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