Show future posts in wordpress single pages

gistfile1.php

function allow_future_posts($posts) {
	global $wp_query, $wpdb;

	if (is_single() && $wp_query->post_count == 0) {
		$posts = $wpdb->get_results($wp_query->request);
	}

	return $posts;
}
add_filter('the_posts', 'allow_future_posts');