timestamp changed to format laravel

Question

protected function grid()
    {
        $grid = new Grid(new Article());

        $grid->column('id', __('Id'));
        $grid->column('name', __('Author'));
        $grid->column('title', __('Title'));
        $grid->column('content', __('Content'));
        $grid->column('created_at', __('Created at')); // here 
        $grid->column('updated_at', __('Updated at'));

        return $grid;
}

I want to change the datetime format in laravel admin version 7 please help me