问如何将Excel序列号转换为.NET DateTime？

EN

void ExcelSerialDateToDMY(int nSerialDate, int &nDay, 
                          int &nMonth, int &nYear)
{
    // Excel/Lotus 123 have a bug with 29-02-1900. 1900 is not a
    // leap year, but Excel/Lotus 123 think it is...
    if (nSerialDate == 60)
    {
        nDay    = 29;
        nMonth    = 2;
        nYear    = 1900;

        return;
    }
    else if (nSerialDate < 60)
    {
        // Because of the 29-02-1900 bug, any serial date 
        // under 60 is one off... Compensate.
        nSerialDate++;
    }

    // Modified Julian to DMY calculation with an addition of 2415019
    int l = nSerialDate + 68569 + 2415019;
    int n = int(( 4 * l ) / 146097);
            l = l - int(( 146097 * n + 3 ) / 4);
    int i = int(( 4000 * ( l + 1 ) ) / 1461001);
        l = l - int(( 1461 * i ) / 4) + 31;
    int j = int(( 80 * l ) / 2447);
     nDay = l - int(( 2447 * j ) / 80);
        l = int(j / 11);
        nMonth = j + 2 - ( 12 * l );
    nYear = 100 * ( n - 49 ) + i + l;
}