Get BIOS date in asp.net

Question

i check whether admin have licence or not so i check monthwise to login now i am using system date for check but admin change system date so i want date BIOS date

Answer 1

Getting BIOS date won't change anything, because if someone changes the system date, the hardware real-time clock gets changed too.

Better option is to check date outside of client computer, so for example check some URL.