title: MySQL date_add() doesn't work in WHERE clause?
body: <p>When I try to run the following query:</p>
  
  <pre><code>... WHERE `date` = DATE_ADD(NOW(), INTERVAL 10 HOUR)
  </code></pre>
  
  <p>It doesn't work, so I have to use the <code>$date = date("Y-m-d", strtotime('+10 hours'))</code></p>
  
  <p>But why <code>date_add</code> doesn't work?</p>
  
  <p>Thanks much</p>