+    Refresh(true, &rect);
+}
+
+void wxCalendarCtrl::HighlightRange(wxPaintDC* pDC, const wxDateTime& fromdate, const wxDateTime& todate, wxPen* pPen, wxBrush* pBrush)
+{
+    // Highlights the given range using pen and brush
+    // Does nothing if todate < fromdate
+
+
+#if DEBUG_PAINT
+    wxLogDebug("+++ HighlightRange: (%s) - (%s) +++", fromdate.Format("%d %m %Y"), todate.Format("%d %m %Y"));
+#endif
+
+    if ( todate >= fromdate )
+    {
+        // do stuff
+        // date-coordinates
+        int fd, fw;
+        int td, tw;
+
+        // implicit: both dates must be currently shown - checked by GetDateCoord
+        if ( GetDateCoord(fromdate, &fd, &fw) && GetDateCoord(todate, &td, &tw) )
+        {
+#if DEBUG_PAINT
+            wxLogDebug("Highlight range: (%i, %i) - (%i, %i)", fd, fw, td, tw);
+#endif
+            if ( ( (tw - fw) == 1 ) && ( td < fd ) )
+            {
+                // special case: interval 7 days or less not in same week
+                // split in two separate intervals
+                wxDateTime tfd = fromdate + wxDateSpan::Days(7-fd);
+                wxDateTime ftd = tfd + wxDateSpan::Day();
+#if DEBUG_PAINT
+                wxLogDebug("Highlight: Separate segments");
+#endif
+                // draw separately
+                HighlightRange(pDC, fromdate, tfd, pPen, pBrush);
+                HighlightRange(pDC, ftd, todate, pPen, pBrush);
+            }
+            else
+            {
+                int numpoints;
+                wxPoint corners[8]; // potentially 8 corners in polygon
+
+                if ( fw == tw )
+                {
+                    // simple case: same week
+                    numpoints = 4;
+                    corners[0] = wxPoint((fd - 1) * m_widthCol, (fw * m_heightRow) + m_rowOffset);
+                    corners[1] = wxPoint((fd - 1) * m_widthCol, ((fw + 1 ) * m_heightRow) + m_rowOffset);
+                    corners[2] = wxPoint(td * m_widthCol, ((tw + 1) * m_heightRow) + m_rowOffset);
+                    corners[3] = wxPoint(td * m_widthCol, (tw * m_heightRow) + m_rowOffset);
+                }
+                else
+                {
+                    int cidx = 0;
+                    // "complex" polygon
+                    corners[cidx] = wxPoint((fd - 1) * m_widthCol, (fw * m_heightRow) + m_rowOffset); cidx++;
+
+                    if ( fd > 1 )
+                    {
+                        corners[cidx] = wxPoint((fd - 1) * m_widthCol, ((fw + 1) * m_heightRow) + m_rowOffset); cidx++;
+                        corners[cidx] = wxPoint(0, ((fw + 1) * m_heightRow) + m_rowOffset); cidx++;
+                    }
+
+                    corners[cidx] = wxPoint(0, ((tw + 1) * m_heightRow) + m_rowOffset); cidx++;
+                    corners[cidx] = wxPoint(td * m_widthCol, ((tw + 1) * m_heightRow) + m_rowOffset); cidx++;
+
+                    if ( td < 7 )
+                    {
+                        corners[cidx] = wxPoint(td * m_widthCol, (tw * m_heightRow) + m_rowOffset); cidx++;
+                        corners[cidx] = wxPoint(7 * m_widthCol, (tw * m_heightRow) + m_rowOffset); cidx++;
+                    }
+
+                    corners[cidx] = wxPoint(7 * m_widthCol, (fw * m_heightRow) + m_rowOffset); cidx++;
+
+                    numpoints = cidx;
+                }
+
+                // draw the polygon
+                pDC->SetBrush(*pBrush);
+                pDC->SetPen(*pPen);
+                pDC->DrawPolygon(numpoints, corners);
+            }
+        }
+    }
+    // else do nothing
+#if DEBUG_PAINT
+    wxLogDebug("--- HighlightRange ---");
+#endif
+}
+
+bool wxCalendarCtrl::GetDateCoord(const wxDateTime& date, int *day, int *week) const
+{
+    bool retval = true;
+
+#if DEBUG_PAINT
+    wxLogDebug("+++ GetDateCoord: (%s) +++", date.Format("%d %m %Y"));
+#endif
+
+    if ( IsDateShown(date) )
+    {
+        bool startOnMonday = ( GetWindowStyle() & wxCAL_MONDAY_FIRST ) != 0;
+
+        // Find day
+        *day = date.GetWeekDay();
+
+        if ( *day == 0 ) // sunday
+        {
+            *day = ( startOnMonday ) ? 7 : 1;
+        }
+        else
+        {
+            *day += ( startOnMonday ) ? 0 : 1;
+        }
+
+        int targetmonth = date.GetMonth() + (12 * date.GetYear());
+        int thismonth = m_date.GetMonth() + (12 * m_date.GetYear());
+
+        // Find week
+        if ( targetmonth == thismonth )
+        {
+            *week = GetWeek(date);
+        }
+        else
+        {
+            if ( targetmonth < thismonth )
+            {
+                *week = 1; // trivial
+            }
+            else // targetmonth > thismonth
+            {
+                wxDateTime ldcm;
+                int lastweek;
+                int lastday;
+
+                // get the datecoord of the last day in the month currently shown
+#if DEBUG_PAINT
+                wxLogDebug("     +++ LDOM +++");
+#endif
+                GetDateCoord(ldcm.SetToLastMonthDay(m_date.GetMonth(), m_date.GetYear()), &lastday, &lastweek);
+#if DEBUG_PAINT
+                wxLogDebug("     --- LDOM ---");
+#endif
+
+                wxTimeSpan span = date - ldcm;
+
+                int daysfromlast = span.GetDays();
+#if DEBUG_PAINT
+                wxLogDebug("daysfromlast: %i", daysfromlast);
+#endif
+                if ( daysfromlast + lastday > 7 ) // past week boundary
+                {
+                    int wholeweeks = (daysfromlast / 7);
+                    *week = wholeweeks + lastweek;
+                    if ( (daysfromlast - (7 * wholeweeks) + lastday) > 7 )
+                    {
+                        *week += 1;
+                    }
+                }
+                else
+                {
+                    *week = lastweek;
+                }
+            }
+        }
+    }
+    else
+    {
+        *day = -1;
+        *week = -1;
+        retval = false;
+    }
+
+#if DEBUG_PAINT
+    wxLogDebug("--- GetDateCoord: (%s) = (%i, %i) ---", date.Format("%d %m %Y"), *day, *week);
+#endif
+
+    return retval;