Sort Wordpress Categories by Year

  <?php
      $current_category = get_query_var('cat');
      $year ='';
      if(isset($_GET['postyear'])){
          $year = '&year='.intval($_GET['postyear']);
          $title_year = htmlspecialchars($_GET['postyear']);
      }
      query_posts('cat='.$current_category . $year);
  ?>

http://wordpress.org/support/topic/combining-year-and-category-with-permalinks

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