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I create date time cell, set this options:

    d->ModifyStyle(__EGCS_BUTTON_DROPDOWN,0);
    d->SetMode(CExtGridCellDateTime::date);

Cell is initially empty. When I click into cell to start edit, then press "1", it puts there some date like 1.January....... Then I open the calendar control, click to "none" button to erase the date. When I select cell to start edit and press "1" again, in debug mode it asserts in

CExtDateTimeWnd::stat_GetDaysInMonth( INT nYear, INT nMonth )

at

ASSERT( dt1.GetStatus() == COleDateTime::valid
        ||    dt1.GetStatus() == COleDateTime::null
        );

nMonth is -1

I’m trying it with 2.92
Can you check it please? Thank you.

Thank you for reporting this issue. To fix it, please update the source code for the CExtGridInplaceDateTime::Create() virtual method in the ExtGridWnd.h file:

    virtual bool Create()
    {
        __EXT_DEBUG_GRID_ASSERT_VALID( this );
        __EXT_DEBUG_GRID_ASSERT( m_hWnd == NULL );
        if( m_wndGrid.GetSafeHwnd() == NULL )
        {
            __EXT_DEBUG_GRID_ASSERT( FALSE );
            delete this;
            return false;
        }
        DWORD dwAreaFlags =
            CExtGridHitTestInfo::CellTypesToAreaFlags(
                m_nColType,
                m_nRowType
                );
        bool bFontMustBeDestroyed = false;
        HFONT hCellFont = m_cell.OnQueryCellFont( m_wndGrid, m_nVisibleColNo, m_nVisibleRowNo, m_nColNo, m_nRowNo, m_nColType, m_nRowType, dwAreaFlags, bFontMustBeDestroyed );
        HFONT hFont = hCellFont;
        if( hFont == NULL )
        {
            hFont = (HFONT)
                m_wndGrid.OnSiwGetDefaultFont().GetSafeHandle();
            if( hFont == NULL )
                hFont = (HFONT)
                    ::GetStockObject(DEFAULT_GUI_FONT);
            if( hFont == NULL )
            {
                if( hFont == NULL )
                    hFont = (HFONT)
                        ::GetStockObject(SYSTEM_FONT);
                if( hFont == NULL )
                {
                    __EXT_DEBUG_GRID_ASSERT( FALSE );
                    delete this;
                    return false;
                }
            }
        }
        LOGFONT lf;
        __EXT_DEBUG_GRID_VERIFY( ::GetObject(hFont,sizeof(LOGFONT),&lf) );
        if(        bFontMustBeDestroyed 
            &&    hCellFont != NULL 
            )
            ::DeleteObject( hCellFont );
        if( ! m_font.CreateFontIndirect(&lf) )
        {
            __EXT_DEBUG_GRID_ASSERT( FALSE );
            delete this;
            return false;
        }
        UINT nDrawTextFlags = m_cell.OnQueryDrawTextFlagsForInplaceEdit( m_nVisibleColNo, m_nVisibleRowNo, m_nColNo, m_nRowNo, m_nColType, m_nRowType, dwAreaFlags, 0 );
        bool bReadOnly = false;
        bool bPassword = false;
        COLORREF clrText = COLORREF(-1L);
        COLORREF clrBack = COLORREF(-1L);
        m_cell.OnInplaceControlQueryStyle(
            m_wndGrid, this, m_nVisibleColNo, m_nVisibleRowNo, m_nColNo, m_nRowNo, m_nColType, m_nRowType,
            dwAreaFlags, bReadOnly, bPassword, clrBack, clrText
            );
        COLORREF clrTextAll = m_cell.TextColorGet( CExtGridCell::__ECS_ALL );
        COLORREF clrTextNormal = m_cell.TextColorGet( CExtGridCell::__ECS_NORMAL );
        if( clrTextAll != COLORREF(-1L) )
            clrText = clrTextAll;
        else if( clrTextNormal != COLORREF(-1L) )
            clrText = clrTextNormal;
        COLORREF clrBackAll = m_cell.BackColorGet( CExtGridCell::__ECS_ALL );
        COLORREF clrBackNormal = m_cell.BackColorGet( CExtGridCell::__ECS_NORMAL );
        if( clrBackAll != COLORREF(-1L) )
            clrBack = clrBackAll;
        else if( clrBackNormal != COLORREF(-1L) )
            clrBack = clrBackNormal;
        if( clrText != COLORREF(-1L) )
            SetTextColor( clrText );
        if( clrBack != COLORREF(-1L) )
            SetBkColor( clrBack );
        m_bInConstruction = true;
        CExtGIED < CExtGIE < CExtDateTimeWnd > > :: Create( &m_wndGrid, m_rcInplaceControl );        
        if( m_hWnd == NULL )
        {
            __EXT_DEBUG_GRID_ASSERT( FALSE );
            delete this;
            return false;
        }
        SetFont( &m_font );
        CExtGridCellDateTime * pCell = DYNAMIC_DOWNCAST( CExtGridCellDateTime, &m_cell );
        __EXT_DEBUG_GRID_ASSERT( pCell != NULL );
        __EXT_DEBUG_GRID_ASSERT_VALID( pCell );
        CExtGridCellDateTime::eMode_t eMode = pCell->GetMode();
        SetMode( (eMode_t)eMode );
        CExtGridCellDateTime::eTimeFormat_t eTimeFormat = pCell->GetTimeFormat();
        SetTimeFormat( (eTimeFormat_t)eTimeFormat );
        // synchronize item’s visible status
        if( eMode == CExtGridCellDateTime::date || eMode == CExtGridCellDateTime::all )
        {
            SetShowItem( CExtDurationWnd::year, pCell->IsItemVisible( CExtGridCellDateTime::year ), false );
            SetShowItem( CExtDurationWnd::month, pCell->IsItemVisible( CExtGridCellDateTime::month ), false );
            SetShowItem( CExtDurationWnd::month_name_short, pCell->IsItemVisible( CExtGridCellDateTime::month_name_short ), false );
            SetShowItem( CExtDurationWnd::month_name_long, pCell->IsItemVisible( CExtGridCellDateTime::month_name_long ), false );
            SetShowItem( CExtDurationWnd::day, pCell->IsItemVisible( CExtGridCellDateTime::day ), false );
        }
        if( eMode == CExtGridCellDateTime::time || eMode == CExtGridCellDateTime::all )
        {
            SetShowItem( CExtDurationWnd::hour, pCell->IsItemVisible( CExtGridCellDateTime::hour ), false );
            SetShowItem( CExtDurationWnd::minute, pCell->IsItemVisible( CExtGridCellDateTime::minute ), false );
            SetShowItem( CExtDurationWnd::second, pCell->IsItemVisible( CExtGridCellDateTime::second ), false );
            SetShowItem( CExtDurationWnd::designator, pCell->IsItemVisible( CExtGridCellDateTime::designator ), false );
        }
        if( ( nDrawTextFlags & DT_RIGHT ) != NULL )
            SetAlign( right );
        else if( ( nDrawTextFlags & DT_CENTER ) != NULL )
            SetAlign( center );
        else
            SetAlign( left );
        DWORD dwCellStyle = m_cell.GetStyle();
        if(    (dwCellStyle&__EGCS_READ_ONLY) != 0 || bReadOnly )
            SetReadOnly( true );
        if(        m_cell.IsUndefined() 
            ||    m_cell.IsEmpty()
            )
            m_dtPrevious = COleDateTime::GetCurrentTime();
        else
            m_dtPrevious = pCell->GetDateTime();
        if( m_dtPrevious.GetStatus() != COleDateTime::valid )
            m_dtPrevious = COleDateTime::GetCurrentTime();
        m_dtInitial = m_dtPrevious;
        SetDateTime( m_dtInitial, false );
        UpdateDurationWnd( true );
        SetWindowPos( &CWnd::wndTop,0,0,0,0, SWP_NOMOVE|SWP_NOSIZE|SWP_NOACTIVATE|SWP_FRAMECHANGED|SWP_SHOWWINDOW );
        SetFocus();
        m_bInConstruction = false;
        return true;
    }