Update models.

app/Models/Role.php

@@ -41,10 +41,10 @@ class Role extends Model
      */
     protected $casts
                      = [
-            'created_at' => 'date',
-            'updated_at' => 'date',
+            'created_at' => 'datetime',
+            'updated_at' => 'datetime',
         ];
-    protected $dates = ['created_at', 'updated_at'];
+
 
     /**
      * @return \Illuminate\Database\Eloquent\Relations\BelongsToMany