When I copy 12/31/39 from MS Access 2013 or Word 2013 to Excel 2013, the result populates as 12/31/1939 vs. 12/31/2039.
I've checked the Region & Language settings in the control panel. They are set to treat 2-digit year entries as years between 1950 and 2049.
Entering 12/39 directly into...