COleDateTime Comparison Asserts or Returns Incorrect Value

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Article ID: 326459 - View products that this article applies to.
This article was previously published under Q326459
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You receive an assertion in debug builds when an instance of the COleDateTime class with null status is compared with another instance with null status by using either of the following operators:
In release builds, the comparison returns an incorrect value.


This is a change in behavior from the Microsoft Foundation Classes (MFC) that is included with Microsoft Visual C++ 6.0.


A supported hotfix is now available from Microsoft, but it is only intended to correct the problem that is described in this article. Only apply it to systems that are experiencing this specific problem. This hotfix may receive additional testing. Therefore, if you are not severely affected by this problem, we recommend that you wait for the next Visual Studio .NET service pack that contains this hotfix.

To resolve this problem immediately, contact Microsoft Product Support Services to obtain the fix. For a complete list of Microsoft Product Support Services phone numbers and information about support costs, visit the following Microsoft Web site:
NOTE: In special cases, charges that are ordinarily incurred for support calls may be canceled if a Microsoft Support Professional determines that a specific update will resolve your problem. The typical support costs will apply to additional support questions and issues that do not qualify for the specific update in question.

The English version of this fix has the file attributes (or later) that are listed in the following table. The dates and times for these files are listed in coordinated universal time (UTC). When you view the file information, it is converted to local time. To find the difference between UTC and local time, use the Time Zone tab in the Date and Time tool in Control Panel.
   Date          Time    Version        Size        File Name 
   03-Aug-2002   04:49    7.00.9524.0     974,848   Mfc70.dll
   03-Aug-2002   04:49                  9,554,944   Mfc70.pdb
   03-Aug-2002   04:06    7.00.9524.0   1,933,312   Mfc70d.dll
   03-Aug-2002   04:06                  7,572,480   Mfc70d.pdb
   03-Aug-2002   04:39    7.00.9524.0     964,608   Mfc70u.dll
   03-Aug-2002   04:39                  9,538,560   Mfc70u.pdb
   03-Aug-2002   04:08    7.00.9524.0   1,925,632   Mfc70ud.dll
   03-Aug-2002   04:08                  7,597,056   Mfc70ud.pdb
   03-Aug-2002   02:49    7.00.9524.0      84,992   Atl70.dll
   03-Aug-2002   02:49                  2,011,136   Atl70.pdb
   03-Aug-2002   02:49                     14,546   Atl.lib
   03-Aug-2002   02:49                     48,090   Atlmincrt.lib
   03-Aug-2002   02:49                    934,264   Atls.lib
   19-Jul-2002   16:42                    998,634   Atlsd.lib
   03-Aug-2002   04:02                 16,466,620   Nafxcw.lib
   03-Aug-2002   04:02                 16,601,214   Nafxcwd.lib
   03-Aug-2002   04:05                 16,741,976   Uafxcw.lib
   03-Aug-2002   04:05                 17,034,618   Uafxcwd.lib
   03-Aug-2002   02:49                  1,306,624   Atls.pdb
   19-Jul-2002   16:42                  1,306,624   Atlsd.pdb
   03-Aug-2002   04:02                  2,068,480   Nafxcw.pdb
   03-Aug-2002   04:00                  2,093,056   Nafxcwd.pdb
   03-Aug-2002   04:04                  2,068,480   Uafxcw.pdb
   03-Aug-2002   04:03                  2,093,056   Uafxcwd.pdb
   03-Aug-2002   14:35                    850,944   VC_MFC.msm
   02-Aug-2002   18:01                     15,737   ATLComTime.inl


Microsoft has confirmed that this is a problem in the Microsoft products that are listed at the beginning of this article.


Article ID: 326459 - Last Review: October 26, 2013 - Revision: 3.0
Applies to
  • Microsoft Foundation Class Library 4.2, when used with:
    • Microsoft Visual C++ .NET 2002 Standard Edition
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