Restrict user to change system date in ASP.Net

In asp.net this is of no use as your application will be hosted on server.

Thus you have to check date of server and not of user machine.

Thanx a lot @Mudassar Sir,

But in case if the server and client is same.

That means my web application hosted on clinet machine iis where client and server are same.

Then that is not True Client Server configurartion.

And why would you allow clients to work on Server?

Please note ASP.Net does not allow you to control Client machines.

If your Client and Server is same then make a Windows App as there is no need of ASP.Net in such scenario.