PHPExcel检测单元格值是否格式化为日期

Good day guys i have a problem on how to detect if the cell value is formated to date or not when i been upload a date value i use this code

$data = $objWorksheet->getCellByColumnAndRow($col, $row);

when a cell value is formated into date the value is $data = 27474 when is not $data = 12/2/1983 then i use this code to format their date

if(PHPExcel_Shared_Date::isDateTime($data)){
           $cellValue = $objWorksheet->getCellByColumnAndRow($col, $row)->getValue();
           $dateValue = PHPExcel_Shared_Date::ExcelToPHP($cellValue);                        
           $dob =  date('Y-m-d',$dateValue);    
    }                               

now, the problem is when $data is in formated on date this code is OK but when $data is not formated the value is $data = 2036-02-18 which is wrong value

can anyone help me how to resolve this problem Thanks in Advance

Please try this, this should work,

if(PHPExcel_Shared_Date::isDateTime($data)){
   $cellValue = $objWorksheet->getCellByColumnAndRow($col, $row);
   $InvDate= $cellValue->getValue();

   if(PHPExcel_Shared_Date::isDateTime($cell)) {
   $InvDate = date($format, PHPExcel_Shared_Date::ExcelToPHP($InvDate)); 
}  
}  

Thanks to your help guys, however this turned out to be the solution to my problem:

$data = $objWorksheet->getCellByColumnAndRow($col, $row);   

if(!strtotime($data)) {
    if(PHPExcel_Shared_Date::isDateTime($data)) {
        $cellValue = $objWorksheet->getCellByColumnAndRow($col, $row)->getValue();
        $dateValue = PHPExcel_Shared_Date::ExcelToPHP($cellValue);                       
        $dateh     = date('Y-m-d',$dateValue);                          
    } else {                        
        $dateh  = "";                                                   
    } else {
        $st = strtotime($data);
        $dateh = date('Y-m-d',$st);                         

    }               
}