update: laravel 7

app/Models/InviteCode.php

@@ -8,4 +8,8 @@ class InviteCode extends Model
 {
     protected $table = 'v2_invite_code';
     protected $dateFormat = 'U';
+    protected $casts = [
+        'created_at' => 'timestamp',
+        'updated_at' => 'timestamp'
+    ];
 }