When you export your Microsoft Office PivotTable list to Microsoft Excel, 12:00:00 AM is displayed in the PivotTable where you expect a date to be.
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This problem occurs when your PivotTable list contains dates earlier than January 1, 1900. Excel does not support date values earlier than January 1, 1900.
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Excel converts dates earlier than January 1, 1900 to a value of zero. The value of 12:00:00 AM that you see is the result of the default formatting that Excel applies to the number.
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