How to display lastest post date in the homepage?

2 comments

1. I would save an option on post save:

   add_action(
     'save_post',
     function($id,$p) {
       if (
         (defined('DOING_AUTOSAVE') && DOING_AUTOSAVE) 
         || (defined('DOING_AJAX') && DOING_AJAX)
         || ($p->post_status === 'auto-draft')
       ) {
         return;
       }
       update_option('_last_site_update',$p->post_date);
     },
     1,2
   );
   

   And retrieve it with a variant of the function provided by @G-M :

   function my_last_updated( $format = '' ) {
     $last = get_option('_last_site_update');
     if ( empty($last) ) return;
     if ( empty($format) ) {
       $format = get_option('date_format');
     }
     return mysql2date($format,$last);
   }
   echo my_last_updated();
   

   This way you:

   1. push the heavy lifting to the admin side,
   2. eliminate the unnecessary work of a full post query (via
      wp_get_recent_posts),
   3. replace that heavy query with a very simple get_option query,
   4. and make the whole thing cache-friendly

2. There are different way to do this.

   The easiest, in my opinion is to use wp_get_recent_posts to retrieve the last post and the print the post modified date.

   Wrapping it in a function make it flexible and reusable. In your functions.php you can put:

   function my_last_updated( $format = '' ) {
     $lasts = wp_get_recent_posts( array('numberposts'=>1, 'post_status'=>'publish') );
     if ( empty($lasts) ) return;
     $last = array_pop($lasts);
     if ( empty($format) ) $format = get_option('date_format');
     return mysql2date( $format, $last['post_modified'] );
   }
   

   Then you can use it like so:

   <p>Last updated: <?php echo my_last_updated() ?>.</p>
   

   The argument $format let you choose a different date format for the date see here to choose one. If nothing is passed, the format set in WP options is used.

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