7.0 nougat - How to delete a date and time tab in setting to prevent user from changing it?

^{(Please understand me about my broken English.)}

I am a student in South Korea.

I am making a quite restricted Lenovo tablet, to make it a perfect education device. The goal is to "help" students to study hard.

To do that, I have to prevent the users from changing the system time in the "Settings", Because changing system time is a easy way to pass my time-dependent application block.

So I am trying to delete the date and time menu from the system settings, to keep only auto time:

By an experience of deleting a guest mode in the system, I think I should use the Buildprop app. But I don't know, what I should delete and change in the system.

Of course it's okay not using Buildprop.

I have a rooted device and my Android version is nougat, 7.1.1.

I'm sorry for using broken English and thanks for reading this. Have a good day!