title: SMARTY - how to add days in variable to date?
body: <p>I want to add to $order->date_add which is date, additional days. Number of days is in variable $order->days
  i have code like this</p>
  
  <pre><code>{$order-&gt;date_add|cat:' +60 days'|date_format:"%d-%m-%Y"}
  </code></pre>
  
  <p>but i want to replace number '60' by variable $order->days. Unfortunetly i can't do it in php - I must make it in smarty. Is it possible? How to replace that 60 by variable?</p>