Help me with a query shows today’s post only

I need a query showing today’s post only, I searched the forum but all the solutions are old entries from previous wordpress versions.

The codex gave this solution but it’s not working:

<?php $current_month = date(‘m’); ?>
<?php $current_year = date(‘Y’); ?>

<?php query_posts(“cat=22&year=$current_year&monthnum=$current_month&order=ASC”); ?>

Any idea??

Thanks in advance