Add the movie's release date to movie title display

functions.php

<?php

/**
 * Add release date to a movie's title
 * 
 * Add this at then end of your theme's functions.php file
 * 
 * @deprecated since WordPress 4.4
 * 
 * @param    string        Current, unfiltered movie title
 * @param    int|object    Post ID ('the_title' filter) or Post object ('single_post_title' filter)
 * 
 * @return   string    Filtered movie title
 */
function wpmoly_movie_title_year( $title, $post_id ) {

	// Don't do this in admin
	if ( is_admin() )
		return $title;

	// Apply only to movies
	if ( 'movie' != get_post_type( $post_id ) )
		return $title;

	// 'the_title' filter gives a post ID, but 'single_post_title' gives a post object
	if ( is_object( $post_id ) )
		$post_id = $post_id->ID;

	// Get release_date for WPMovieLibrary 1.x movies
	$meta = get_post_meta( $post_id, '_wpmoly_movie_data', $single = true );

	// If release date is available
	if ( '' != $meta && isset( $meta['meta']['release_date'] ) ) {
		$date = $meta['meta']['release_date'];
		$date = date_i18n( 'Y', strtotime( $date ) );
		$title = $title . ' (' . $date . ')';
	}

	return $title;
}
add_filter( 'the_title', 'wpmoly_movie_title_year', 10, 2 );
add_filter( 'single_post_title', 'wpmoly_movie_title_year', 10, 2 );