public void fastAdd( Object obj, int row, int col, int formatId )
	{
		int[] rc = { row, col };

		// use default format
		if( formatId == -1 )
		{
			formatId = 0;
		}

		if( obj instanceof java.util.Date )
		{
			String address = ExcelTools.formatLocation( rc );
			add( (java.util.Date) obj, address, null );
		}
		else
		{
			BiffRec reca = mysheet.addValue( obj, rc, formatId );
			if( wbh.getFormulaCalculationMode() != wbh.CALCULATE_EXPLICIT )
			{
				ReferenceTracker rt = wbh.getWorkBook().getRefTracker();
				rt.clearAffectedFormulaCells( reca );
			}
				if( reca != null )
				{
					log.debug( "WorkSheetHandle.add() " + reca.toString() + " Successfully Added." );
				}
		}
	}