Log into the web interface (I've only done this in switch mode, so I cannot comment if your in router mode).
Once logged in to the web interface, go to :
System >
SNTP >
Server Configuration >
Choose Create on the drop-down
Enter the IP of the local NTP server (usually your router or AD server if you've configured it that way)
IPv4
Port: 123
Priority: 1
Version: 3
Submit
I then went to SNTP > Global Configuration
Client Mode: Unicast
Port: 123
6, 6, 5, 1 (for the remaining values in order).
Submit.
It then takes the switch a little while to actually trigger the NTP query and update its time-stamp. The only thing that I have not been able to configure is my timezone, so it always wants to set its time to UTC time, not my current TZ (EST = GMT - 5). So if someone figures out how to specify the TimeZone that should be the final step needed.