Question: how to start xntpd service in aix?
Answer: Verify that you have a server suitable for synchronization. Enter: # ntpdate -d ip.address.of.server. ... 
Specify your xntp server in /etc/ntp.conf, enter: # vi /etc/ntp.conf. ... 
Start the xntpd daemon: # startsrc -s xntpd. ... 
Uncomment xntpd from /etc/rc. ... 
Verify that the client is synched.