错误：Class 'Home\Controller\PHPExcel_Shared_Date' not found
found

解决办法
$data['accepttime']=gmdate("Y-m-d H:i:s", PHPExcel_Shared_Date::ExcelToPHP($objPHPExcel->getActiveSheet()->getCell("B".$i)->getValue()));

PHPExcel_Shared_Date前面需要添加“\”