PHPexcel 判断日期类型

若已经确定某列为日期型数据：

 for($currentRow=2;$currentRow <= $allRow;$currentRow++){
                     //从哪列开始，A表示第一列
                     for($currentColumn='A';$currentColumn <= $allColumn;$currentColumn++){
                     //数据坐标
                         $address=$currentColumn.$currentRow;
                         if($currentColumn =='E'){
                             $cvalue = gmdate("Y-m-d H:i:s", \PHPExcel_Shared_Date::ExcelToPHP($PHPExcel->getActiveSheet()->getCell($address)->getValue())); 

                         }
                         else{
                             $cvalue = $currentSheet->getCell($address)->getValue();
                         }

                         $arr[$currentRow][$currentColumn]=$cvalue;
                     }

                 }

若先判断，再设置

  for($currentRow=1;$currentRow<=$allRow;$currentRow++){
         //从哪列开始，A表示第一列
             for($currentColumn='A';$currentColumn<=$allColumn;$currentColumn++){
                 //数据坐标
                 $address=$currentColumn.$currentRow;
                 $cell = $currentSheet->getCell($address);
                 $cvalue = $cell->getValue();

                 if($cell->getDataType()==\PHPExcel_Cell_DataType::TYPE_NUMERIC){
                     $cellstyleformat = $cell->getStyle($cell->getCoordinate())
                     ->getNumberFormat();  

                     $formatcode = $cellstyleformat->getFormatCode(); 

                     if (preg_match('/^(\[\$[A-Z]*-[0-9A-F]*\])*[hmsdy]/i', $formatcode)) {
                         $cvalue = gmdate("Y-m-d", \PHPExcel_Shared_Date::ExcelToPHP($cvalue));
                     }
                     else{
                         $cvalue=\PHPExcel_Style_NumberFormat::toFormattedString($cvalue,$formatcode);
                     }
                 }

                 //读取到的数据，保存到数组$arr中\
                 $arr[$currentRow][$currentColumn]=$cvalue;
             }
         }