title: Date format in FullCalendar Timeline view
body: <p>I am trying to configure FullCalendar 4.3.1 in Timeline view to display date in UK format in the title and on column headers. I use slotLabelFormat and titleFormat as below:</p>
  
  <pre><code>slotLabelFormat: [
    { day: 'numeric', weekday: 'short', month: 'short'},
    { hour: 'numeric' }
  ],
  titleFormat: {day: 'numeric', month: 'long', year: 'numeric'}
  </code></pre>
  
  <p>This works, however, it does not choose the order of items so I end up with Mon Dec 31 instead of Mon 31 Dec. Is there a way to set the order or default date format (based on location)? I can't find it in the docs.</p>