I really like OpenIndiana, but finding some documentation for even the most basic things sometimes is difficult. Take NTP for instance, should be easy right.. And it is if you know what you are doing.
Setup the search domain above, then copy the ntp configuration file:
cp /etc/inet/ntp.client /etc/inet/ntp.conf
Edit the configuration file putting in the servers that are near to you.
svcadm enable ntp