bubasuma\simplechat\models\Message::fields PHP Method

    public function fields()
    {
        return ['senderId' => 'sender_id', 'text', 'date' => function ($model) {
            return static::formatDate($model['created_at'])[1];
        }, 'when' => function ($model) {
            return static::formatDate($model['created_at'])[0];
        }];
    }