How to Display a List of Last Updated Posts in WordPress

functions.php

<?php
/**
 * @link http://www.uckan.net/2017/02/08/wordpress-son-guncellenen-yazilari-listeleme/
 * @package WordPress
 * @uckannet
**/

function last_updated_posts () {
   $args = array(
    'ignore_sticky_posts' => '1',
    'orderby' => 'modified',
   );
  $the_query = new WP_Query( $args );

  if ( $the_query->have_posts() ) {
	echo '<ul>';
	while ( $the_query->have_posts() ) {
		$the_query->the_post();
		echo '<li>' . get_the_title() . '';
		echo ' - Last Modified:';
		echo ''.the_modified_date().'</li>';
	}
	echo '</ul>';
	/* Restore original Post Data */
	wp_reset_postdata();
  } else {
	// no posts found
}
}