title: Change day number color on click - not background
body: <p>I need to change the day number color when I click in any day in full calendar. I'm trying to show that the day clicked is activated.</p>
  
  <p>I tried to use the recommended textColor, color, borderColor and backgroundColor but only the last one works.</p>
  
  <pre><code>dayClick: function(date, jsEvent, view) {
                  $(this).css('textColor', 'red');
              },
  </code></pre>
  
  <p>Thank you.</p>