Is there any way to know about the cahnge of system date by the user?

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  i m using vb.net

  there is a validation of a product for 90 days. And i m checking it by the differance of installation and current date. 

  But if the user change the system date then  it will work as per the current system date..the there will be chances to use the product for more then 90 days...

  I think i will take the system date each time when the user runs the application...and check with the system date and time for the next use...if it will be a post date then it will ask for validation.. but if the user will change the system date to the last used date again then there will be a problem...

  please suggest me...

  Monday, February 19, 2007 11:03 AM