Well, there you go, Paul ...
In date and time settings switch off "set time automatically" to prevent Windows from messing up, as it's your batch file what will be in charge of messing up from now on.
Create this batch file. For some weird reason let's name it GroundhogDay.cmd and put in the desired date.
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date 31-10-16
This needs to be run with administrator privileges every time Windows starts up and maybe every midnight. Therefore create a job within the Task Scheduler ("create task"). A basic task won't allow you to choose the administrator account. The trigger will be "when the computer starts" and (maybe) "daily" at 00:00:01.
That should do the trick.
A hint for other readers: Be aware of side effects that might occur.