wordpress - scheduled posts are showing when I am logged in -

i have posts , upcoming, visible in site. when logged in admin panel, post's single page ok, when logged out in case redirects error 404 page. what's problem? how can solve this?

found solution, added functions.php , future posts showing in single.php:

add_filter('the_posts', 'show_future_posts'); function show_future_posts($posts){    global $wp_query, $wpdb;    if(is_single() && $wp_query->post_count == 0)    {       $posts = $wpdb->get_results($wp_query->request);    }    return $posts; }