title: Select week number or date in JQuery UI datepicker
body: <p>This is the first time that I do something with jQuery UI and also my JS skills are at the beginner level.</p>
  
  <p>What's my problem:</p>
  
  <p>I wanna use JQuery UI datepicker to select:</p>
  
  <ol>
  <li>getting a single date when I click on a day
  or</li>
  <li>getting a date range when I click on the week number.</li>
  </ol>
  
  <p>How can I get the date/date range? But it would be nice to get a simple working example.</p>