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表中数据格式:2019-5-9 PM2:33:51
$cellVal= trim($objPHPExcel->getActiveSheet()->getCell("J" . $j)->getValue());
$toTimestamp = \PhpOffice\PhpSpreadsheet\Shared\Date::excelToTimestamp($cellVal);
$date = date("Y-m-d", $toTimestamp );