title: Rails 3.2.8 - How do I get the week number from Rails?
body: <p>I would like to know how to get the current week number from Rails and how do I manipulate it: </p>
  
  <ol>
  <li>Translate the week number into date.</li>
  <li>Make an interval based on week number.</li>
  </ol>
  
  <p>Thanks.</p>