query_posts ordering issue

Pulling my hair out trying to get these thumbnails to display in the latest order ‘newest first’ – Have tried various different permutations but still the thumbnails display as ‘oldest first’.

<div class="container">
<?php if ( have_posts() ) : ?>
<?php query_posts(array( 'order'=>'desc', 'orderby'=>'post_date','category__and' => (22), 'showposts' => -1 )); $c = 0;  ?>
<?php while ( have_posts() ) : the_post(); $c++; ?>
<div class="four columns"> <a title="<?php the_title(); ?>" href="<?php the_permalink() ?>" style="display:block;">
  <?php
if(has_post_thumbnail()) {
	the_post_thumbnail('medium');
} else {
	echo '<img src="'.get_bloginfo("template_url").'/images/img-default.png" width="220" height="147" />';
}
?>
  </a> <a title="<?php the_title(); ?>" href="<?php the_permalink() ?>">
  <?php the_title(); ?>
  </a>
  <h6>
    <?php the_field('job_url'); ?>
  </h6>
</div>
<?php if( $c == 4) echo '</div><!--container end--><div class="container"><!--container start-->'; elseif ($c == 8) echo '</div><!--container end-->';?>
<?php if( $c == 8) echo '<div class="container"><!--container start-->'; elseif ($c == 12) echo '</div><!--container end-->';?>
<?php if( $c == 12) echo '<div class="container"><!--container start-->'; elseif ($c == 16) echo '</div><!--container end-->';?>
<?php endwhile; endif; ?>