Personally I don't know of any application that would allow the date change for certain applications....this would be a little difficult to develop too as the system time can only exist in one single entry. The fix would have to come from the other application's development...
Have you thought about purchasing a license for this application? If you have good use for this software and are going to put it to work for you for a long time, why not pay the small fee? After all, you are willing to pay a small fee for the date/time change software, right?