You are correct that caution should be used in setting or even looking at system date on Windows. System date is critical for our licensing to function properly and it can be easy to set it to the wrong date. Fortunately, if you accidentally set the date wrong and set it correctly before running any Mentor application, you should not encounter any problem.
Given that this is part of our security system, you'll need to open a Service Request for this and have one of our CAE's help you resolve it. With current versions of our software, the fix cannot be implemented without direct support.