How to use time in application

I am designing an application for employee check in and out system. Right now my application capture the system time. Problem is any one can change the system time and date. is their any other way to capture the time and date, or any suggestion how can i make it work better

Is your application client/server? Where is the data being stored? Hopefully the data is being stored on a server and if that's the case you can read the time off the server. Either using the database or IIS depending on what the environment is.

Or if the application is running on computers with access to the internet you can access time from a number of public servers that provide accurate time....but you don't have to go through with this if you can get it off your own network.

Thanks for reply. i can read time from server