我不知道出了什么问题,但我无法插入数据库。这是我在模型中得到的。保修.phpTimestampBehavior::className(),'createdAtAttribute'=>'tstamp','updatedAtAttribute'=>false,'value'=>newExpression('NOW()'),],];}/***@inheritdoc*/publicfunctionrules(){return[[['item_no','warranty_date'],'required'],[['warranty_date','date'],'string'],['create