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http://www.kloningspoon.com/2014/11/wordpress-display-list-last-updated-posts/
WordPress: Display a List of Last Updated Posts
If you are using last modified date, then you might want to show a list of your recently updated posts on your site. Each time you update a post, WordPress stores the date and time of that update in the posts table as last updated date. We will show you how to create a custom WordPress query to list your most recently updated articles.
Copy code below to your functions.php
function wpb_lastupdated_posts() // Query Arguments $lastupdated_args = array( 'orderby' => 'modified', 'ignore_sticky_posts' => '1' ); //Loop to display 5 recently updated posts $lastupdated_loop = new WP_Query( $lastupdated_args ); $counter = 1; echo '<ul>'; while( $lastupdated_loop->have_posts() && $counter < 5 ) : $lastupdated_loop->the_post(); echo '<li><a href="' . get_permalink( $lastupdated_loop->post->ID ) . '"> ' .get_the_title( $lastupdated_loop->post->ID ) . '</a> ( '. get_the_modified_date() .') </li>'; $counter++; endwhile; echo '</ul>'; wp_reset_postdata(); //add a shortcode add_shortcode('lastupdated-posts', 'wpb_lastupdated_posts');
That’s all. Now if you want to display last updated posts in your theme’s template files, then you can use it like this:
<?php if (function_exists(wpb_lastupdated_posts)) : wpb_lastupdated_posts(); endif; ?>
And if you need to change in the posts or pages then you need to open these files: index.php or home.php, single.php and page.php. But sometimes theme developer change this file with template, like loop.php inside include folder.
Then you will need to locate the following code:
<?php the_modified_time('F jS, Y');?>
Replace it with:
<?php $u_time = get_the_time('U'); $u_modified_time = get_the_modified_time('U'); if ($u_modified_time >= $u_time + 86400) echo "and last modified on "; the_modified_time('F jS, Y'); echo " at "; the_modified_time(); echo ", "; ?>
Or maybe you want to not change the original post date instead add last updated info below post date, you could try WordPress plugin Last Updated Shortcode.
source: wpbeginner