0 ????? ?? ??? ???? ?? 31 ??????
0 ????? ????? ????? ???? ??? ??? 1 ????? ?? ??????? ?????? ??????.
In the Microsoft Office Spreadsheet Component, the value 0 evaluates to the date December 30, 1899 and the value 1 evaluates to December 31, 1899. ... In Excel, the value 0 evaluates to January 0, 1900 and the value 1 evaluates to January 1, 1900.