Taken from official manual:
Date/Time: in the Date Time section, you can adjust the time stamp on your
videos. Choose PC Date Time to program the device using the time and date
saved to your computer.
Click the Custom Date Time option button to manually program the timestamp
using the dropdown boxes.
DVR Date Time SnapShot displays the timestamp programmed into your
Camscura Pro when it was connected to your PC.
To load any time changes, click on Sync Date Time to DVR. You should see a
notification that reads “Date Time Updated” when complete.