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Or you can provide a couple of macros that do exactly what your users need, without the confusion the built-in features sometimes cause.
With just a little training, you can eliminate that confusion.
(Tip: when creating a new filter in Process Monitor, click the reset button in the filter dialog first to clear any filter from the previous session.) Now do your file copy again and Process Monitor will show you when any process hits your files.
If there is too much noise, you can right-click on things to exclude stuff, or you can make the filter more specific.
When you enter a date, Excel converts it into a serial number that represents the number of elapsed days since January 1, 1904.
This gets into the leap year issue that Tech Republic member Paul mentioned.