microformats wordpress date elements

$send_time_rs = get_the_time('c');
$updated_time_rs = get_the_modified_time('c');		

echo '<time class="published" style="display: none;" datetime="';		
echo $send_time_rs;
echo '">';
echo $send_time_rs;
echo '</time> ';

if($send_time_rs!==$updated_time_rs) {
  echo '<time class="updated" style="display: none;" datetime="';		
  echo $updated_time_rs;
  echo '">';
  echo $updated_time_rs;
  echo '</time> ';			
}