Check the log file under Monitoring - Filterable Event Log, you should see a message like:
33661 09/27/2004 22:05:18.000 SEV=6 TIME/1 RPT=2
The time has been set.
33662 09/27/2004 22:05:18.000 SEV=4 GENERAL/1 RPT=3
NTP time synchronized with server 10.10.10.150 by -0.009213 seconds
Note to see the first message you'll need to go under Config - System - Events - Classes, and add the TIME class at Severity to Log 1-6.
