Expiration date file

Before releasing the file to the end user just keep a temp sheet.
In Temp Sheet just store the Start Date in A1 cell and End Date in A2 Cell.
Hide it with very hidden property of VBA window and lock the project with a password too...

In Workbook_Open event compare whether A3 cell (In the initial Stage It will be blank cell) value is lower than the current system date if so then just store the current date of the sytem in A3 cell and allow the code to check the rest of the Start and End Date conditions.

If A3 is greater than Current System Date then have a code to exit the file and write Exit in A3.

So when next time workbook opens and find a value Exit in A3 then the code will simply exit the file instead of checking the rest of the parts.

So the current date is assigned in A3 cell so changing the system time won't help the end users in this case

Sorry I don't have any other options with me

I hope someone will pitch in and give solution for this issue