Add the movie's release date to movie title display

functions.php

<?php

/**
 * Filter Yoast SEO title
 * 
 * @param    string   $title 
 * 
 * @return   string
 */
function wpseo_movie_title( $title ) {

	global $post;

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

	// Apply only to movies
	if ( 'movie' != get_post_type( $post->ID ) ) {
		return $title;
	}

	// Get release_date for WPMovieLibrary 1.x movies
	$date = get_post_meta( $post->ID, '_wpmoly_movie_release_date', $single = true );
	if ( empty( $date ) ) {
		return $title;
	}

	$date = date_i18n( 'Y', strtotime( $date ) );
	$new_title = $post->post_title . ' (' . $date . ')';

	$title = str_replace( $post->post_title, $new_title, $title );

	return $title;
}
add_filter( 'wpseo_title', 'wpseo_movie_title' );