This is going to be a quick configuration of the NTP server to synchronize the clock on the gateway. In order to do that, follow these steps:
Click on the Configuration tab and expand System:
Select NTP Servers and click on Add. You will get the following form in which you can enter the information about your NTP server and poll interval. Once done, click on Create:
Once created, you will see them in the NTP Servers list:
NTP Servers list
Now click on the Action dropdown and then on Configure NTP Synchronization. Enable the synchronization and click on OK:
Once enabled, you system time will change as per the NTP server and you can verify that by going to the System view:
System information