Please launch your browser and enter http://dlinkrouter.local or http://192.168.0.1 into the address bar. Then login and follow the steps below:
Step 1: Click on the Maintenance -> Time & Schedule

 
Step 2: By default, the D-Link NTP server is enabled. Specify the Time Zone if you need to synchronize the time with the specific region, and enable daylight saving if required, and click Save.

 
Note: To manually specify the time, change the automatic time configuration to Disabled, then adjust time as needed and click Save.