Conversion of Microsoft DATE to int day, int month, int year?

Posted on 2008-06-24
Last Modified: 2008-06-24
Any system or free code to convert the DATE value to the integer values representing the day, month, year?

Hi experts,

I need to convert the Microsoft data type DATE (typedef double, if I am not mistaken) to the integer values. So far I have found the code by Victor Vogelpoel Is there any "more official" code by Microsoft or any other proven code?

The value was read from a MS Access database using Microsoft.Jet.OLEDB.4.0 + ADO Recordset, thus getting the VARIANT value of the VT_DATE (the _variant_t v variable inside C++ source, value).


    Excel serial date to Day, Month, Year and vise versa

    By Victor Vogelpoel


void ExcelSerialDateToDMY(DATE SerialDate, int &nDay, 

                          int &nMonth, int &nYear)


    int nSerialDate = static_cast<int>(SerialDate);

    // 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;



    else if (nSerialDate < 60)


        // Because of the 29-02-1900 bug, any serial date 

        // under 60 is one off... Compensate.



    // 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;


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Question by:pepr
  • 2
LVL 30

Accepted Solution

Zoppo earned 500 total points
Comment Utility
Hi pepr,

there's a function VariantTimeToSystemTime - as arguments it has a double value represanting the DATA and a pointer to an SYSTEMTIME instance which get's filled - the SYSTEMTIME structure has members for year, month, day a.s.o.

Hope that helps,

LVL 30

Expert Comment

Comment Utility
You could even use the COleDateTime class if you use MFC. This encapsulates calls to VariantTimeToSystemTime ...
LVL 28

Author Comment

Comment Utility
Yes, this is what I have searched for (VariantTimeToSystemTime --



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