# vi /etc/inet/ntp.conf
server (IP of NTP Server) prefer
driftfile /var/ntp/ntp.drift
============ Start NTP Daemon =========
# /usr/lib/inet/xntpd
or
# svcadm -v enable svc:/network/ntp ####
========== Test ==============
# ntpq
ntpq> peers
remote refid st t when poll reach delay offset disp
===================================================
* (IP of NTP Server) 10.216.13.50 2 u 786 1024 377 5.97 1.607 3.45