php 导入excel 表格里时间 进行处理

 /**
    * [excelTime description]
    * @Author:XuXianGang
    * @Method:excel 转换时间
    * @DateTime:2022-06-06T09:36:37+0800
    * @param [type]  $days [description]
    * @param boolean $time [description]
    * @return [type]       [description]
    */
  
  function excelTime($days, $time=false){
      if(is_numeric($days)){
          //based on 1900-1-1
          $jd = GregorianToJD(1, 1, 1970);
          $gregorian = JDToGregorian($jd+intval($days)-25569);
          $myDate = explode('/',$gregorian);
          $myDateStr = str_pad($myDate[2],4,'0', STR_PAD_LEFT)
                  ."-".str_pad($myDate[0],2,'0', STR_PAD_LEFT)
                  ."-".str_pad($myDate[1],2,'0', STR_PAD_LEFT)
                  .($time?" 00:00:00":'');
          return $myDateStr;
      }
      return $days;
  }

# 调用方式
$t = "44972";
$this->excelTime($t);