Microsoft KB Archive/155005

= DOC: COleDateTime No Longer Accepts 2-Digit Years =

Article ID: 155005

Article Last Modified on 11/21/2006

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APPLIES TO

 Microsoft Foundation Class Library 4.2, when used with:  Microsoft Visual C++ 4.2 Enterprise Edition

 Microsoft Visual C++ 4.2 Professional Edition 

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This article was previously published under Q155005



SUMMARY
In Visual C++ versions 4.0 and 4.1, the COleDateTime class allows the user to pass two-digit years when constructing a COleDateTime object or setting its date. Starting with version 4.2 of Visual C++, you must pass a three- or four-digit year to COleDateTime. This change in behavior was not reflected in the documentation provided with Visual C++ version 4.2. Microsoft has confirmed this to be a bug in the Microsoft products listed at the beginning of this article. This bug has been corrected in Visual C++ versions 5.0 and 6.0.



MORE INFORMATION
The COleDateTime class provided with Visual C++ versions 4.0 and 4.1 automatically converts two-digit years to four-digit values. This conversion process assumes that the date is in the 20th Century. For example, the year 96 is converted to 1996 to correct problems that occur for dates after 12/31/1999; the COleDateTime class no longer performs this conversion. Starting with version 4.2, the user MUST specify the complete year. If a two-digit year is specified in version 4.2, subsequent calls to member functions such as GetYear will fail.

The online documentation was not updated in Visual C++ version 4.2 to reflect this change in behavior. Future versions of the documentation will indicate that 100 - 9999 is the valid range for the year component of COleDateTime.

Applications written with MFC to target Win32s will probably see this problem because MFC from Visual C++ 4.1 is the last version supported on Win32s.

Additional query words: Y2K

Keywords: kbbug kbdocerr kbdocfix kbfix kbvc500fix kbvc600fix KB155005

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