$rq=$objPHPExcel->getActiveSheet()->getCell("A".$i)->getValue();
$account = $objPHPExcel->getActiveSheet()->getCell("B".$i)->getValue();
$childaccount=$objPHPExcel->getActiveSheet()->getCell("C".$i)->getValue();


$rqt = $this->excelTime($rq); //问题就出在这里了，如果不加$this->excelTime保存执行保存下面的字段都能取到值，加了下面的值就都是NULL了？？
$model = M( "accountbalance" );
$model->balancedate = $rqt;
$model->balance = $objPHPExcel->getActiveSheet()->getCell("D".$i)->getValue();
$model->account_id = $this->getAccountID($account,$childaccount);
$model->modifier = session('users');
$model->add();