title: How to modify fullcalendar columnFormat with bracket?
body: <p>I need to display like this <code>10/15 (Sun)</code> as my client want ! But if I set that format on <code>columnFormat</code> ,it can't display within bracket text . How can I set <code>M/D (ddd)</code> to display in <code>columnFormat</code> . But you know , other like <code>{ddd}</code> is can display on week column</p>
  
  <p><div class="snippet" data-lang="js" data-hide="false" data-console="true" data-babel="false">
  <div class="snippet-code">
  <pre class="snippet-code-js lang-js prettyprint-override"><code>$("#calendar").fullCalendar({
      header: {
              left: 'prev,next today',
              center: 'title',
              right: 'month,agendaWeek,agendaDay,listWeek'
          },
          defaultView: 'agendaWeek',
          views : {
             agendaWeek : {
                columnFormat : "M/D (ddd)"
             }
          }
  });</code></pre>
  <pre class="snippet-code-html lang-html prettyprint-override"><code>&lt;script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"&gt;&lt;/script&gt;
  &lt;script src="https://cdnjs.cloudflare.com/ajax/libs/moment.js/2.19.1/moment.min.js"&gt;&lt;/script&gt;
  &lt;link href="https://cdnjs.cloudflare.com/ajax/libs/fullcalendar/3.6.1/fullcalendar.min.css" rel="stylesheet"/&gt;
  &lt;script src="https://cdnjs.cloudflare.com/ajax/libs/fullcalendar/3.6.1/fullcalendar.min.js"&gt;&lt;/script&gt;
  &lt;div id="calendar"&gt;&lt;/div&gt;</code></pre>
  </div>
  </div>
  </p>