Dear friend!
Please log in to the web management page of the device, click Advanced Configuration > Application tab, and choose Time Setting in the navigation tree on the left. In the pane on the right, set the parameters related to the system time, including the SNTP server, time zone, and daylight
saving time (DST), Then click Apply.

Parameters related to the system time:

If you still cannot set the system time, Please log in to the system using the administrator account and try again.
Thanks!