1 comment

1. Here is what you need:

   $yearly = new WP_Query(array('posts_per_page' => -1));
   $prev_year = null;
   if( $yearly->have_posts() ) : while( $yearly->have_posts() ) : $yearly->the_post();
         $this_year = get_the_date('Y');
         if ($prev_year != $this_year) {
             if (!is_null($prev_year)) {
                echo '</ul>';
             }
             echo '<h3>' . $this_year . '</h3>';
             echo '<ul>';
         }
         echo '<li>';
         echo '</li>';
         $prev_year = $this_year;
       endwhile;    
       echo '</ul>';
   endif;
   

   Please take a look at the documentation as well: http://codex.wordpress.org/Class_Reference/WP_Query

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