Как массово изменять дату обновления у публикаций?

<div class="mediaupload-file-params" style="display:none;"><span class="mediaupload-insert-descr">{$lang['media_upload_b2']}</span>
	<label class="radio-inline"><input id="attachfordownload" class="icheck" type="radio" name="filemode" value="1" checked="checked">{$lang['media_upload_ip4']}</label>
	<label class="radio-inline"><input id="attachforplayer" class="icheck" type="radio" name="filemode" value="0">{$lang['media_upload_ip5']}</label>
</div>

$user_query = "subaction=allnews&user=" . urlencode ( $user );

$vardas = urlencode ( $user );
$tpl->set( '{vardas}', ( $vardas ) );