订单列表显示创建时间

app/Admin/Controllers/OrderController.php

@@ -129,6 +129,11 @@ class OrderController extends AdminController
             });
 
             $grid->column('msg')->limit(10);
+            $grid->column('create_time')->display(function (){
+                if(!empty($this->create_time)){
+                    return date("Y-m-d H:i:s", $this->create_time);
+                }
+            })->sortable();
 
             $grid->filter(function (Grid\Filter $filter) {
                 $filter->equal('id');