Excel actually stores dates as integers on the backend, so you might be able to just add a number to all your data.
June 1, 1981 = 29738 in Excel
So if your June 1, 1981 = 4901, then you should be able to just add 29738 - 4901 = 24837 to every date to get it into Excel.
Note that different versions of Excel may use a different starting point if you're on Mac or PC, so test it first and adjust the offset if necessary.
Once you get all the integers in a column in Excel, you should be able to reformat the cells as dates to see the full date displayed.
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| 10/02/2015, 8:50 PM | Days from date calcuatlor |
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