show future posts

There are several plugins for that:

https://ww.wp.xz.cn/plugins/future/

In one of my project I was using this hard coded solution. It was based on Twenty Ten theme. In index.php I modified loop to:

<div id="container">

			<div id="content" role="main">

						<!-- Constructing new custom LOOP outside the main LOOP -->

						<?php /* Adding filter to show posts for today and future */ ?>
						<?php add_filter( 'posts_where', 'my_posts_where_from_today' ); ?>

						<?php query_posts( array( 'category_name' => 'naujienos', 'post_status' => 'future || publish', 'post_type' => 'post', 'post_per_page' => '15', 'orderby' => 'date', 'order' => 'ASC' ) ); ?>
						<?php while ( have_posts() ) : the_post(); ?>

						<div id="post-<?php the_ID(); ?>" <?php post_class(); ?>>
						<h2 class="entry-title"><a href="<?php the_permalink(); ?>" title="<?php printf( esc_attr__( 'Permalink to %s', 'twentyten' ), the_title_attribute( 'echo=0' ) ); ?>" rel="bookmark"><?php the_title(); ?></a></h2>

[...]

Then this functions goes to functions.php:

//Show posts for today and future
function my_posts_where_from_today( $where = '' ) {
	$where .= " AND post_date > '" . date('Y-m-d', strtotime('now')) . "'";
	return $where;
}

/* Show future posts on single posts and pages*/
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;
}
add_filter('the_posts', 'show_future_posts');