Can I write a builtin Clock in my standalone application exe file?

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Dear All,
I am using the datetime to control the days the users can use our standalone application code. But I found a flaw of this approach: the user change his computer date and time, then my code will not have any use-time limit.
I am wondering if anybody knows how to solve this problem. Can I write a builtin clock in my code to control the datetime on my own?
Thanks a lot.

Accepted Answer

Rik on 22 Jun 2020
Edited: Rik on 22 Jun 2020
Host the UTC timestamp on your server and then use a function to retrieve it. That way you have a known correct date to verify your licenses with. ( the NIST has a page that displays the UTC, it used to be possible to retrieve the timestamp through Matlab, but they blocked it due to large amounts of trafic that attracted )
If you want offline protection as well, I don't think you will be able to do it, even if you track total use time.

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