How to Protect System Time

Hai,

I have developed an attendance project in vb6.0. But, there is a problem in that. i.e. we change the system time the attendance is accepcted.

so, how to protect the time and date. if the system time is changed , the actual time is not to be changed. how it is possible? it is possible to get system date and time from registry? how to get?

ple. send me the clear solution.

thanks in advance.