View difference between Paste ID: ggZ31GuE and MjsFcZfk

 // add custom columns
 add_filter('manage_ii-movies_posts_columns' , 'ii_add_movies_columns');
 // add corresponding values
 add_action( 'manage_ii-movies_posts_custom_column', 'ii_add_movies_values', 10, 2 );
 // make them sortable
 add_filter('manage_ii-movies_sortable_columns','ii_make_sortable_columns');
 // This function deals with managing all movies
 function ii_add_movies_columns() {
 	return array(
         'cb' => '<input type="checkbox" />',
         'title' => __('Title'),
         'year' => __('Year'),
         'directors' => __('Director(s)'),
         'genres' =>__( 'Genres'),
         'date'=>__('Date of publication')
     );
 }
 function ii_add_movies_values( $column, $post_id ) {
 	global $post;
 	if ($column == 'directors') {
 		// Get the meta
 		$director = get_post_meta( $post_id, 'director', true );
 		if ( empty( $director ) ) {	echo __( 'not set' ); }
 		else {
 			for ($i=0;$i<count($director);$i++) {
 				$directors[]=$director[$i]['name'];
 			}
 			echo implode(' / ',$directors);
 		}
 	}
 	elseif ($column == 'year') {
 		// Get the meta
 		$year = get_post_meta( $post_id, 'year', true );
 		if ( empty( $year ) ) {	echo __( 'not set' ); }
 		else { 						echo $year; }
 	}
 	elseif ($column == 'genres') {
 		// Get the meta
 		$genres = get_post_meta( $post_id, 'genres', true );
 		if ( empty( $genres ) ) {	echo __( 'not set' ); }
 		else {
 			echo implode(' / ',$genres);
 		}
 	}
 }
 function ii_make_sortable_columns($columns){
-	// function is never called
+	$columns['date'] = 'date';
-	unset($columns['date']);
+
 }