title: fullcalendar.js showing dates twice from json input
body: <p>I am making a calendar based on dates coming from json input. The problem is even if my json data does not have duplicate dates. its showing two slots of same datetime in one day. I have tried to make the calendar a 24 hours supported calendar as well , but the issue is still there </p>
  
  <pre><code>http://jsfiddle.net/xpsg9pa4/28/
  </code></pre>
  
  <p>The js calendar code i am using. </p>
  
  <pre><code>    $('#calendar').fullCalendar({
       header: {
          left: 'prev',
          center: 'title',
          right: 'next'
        },
        defaultView:'agendaWeek',
        weekNumberCalculation:'ISO',
        defaultDate: new Date(),
        selectable: false,
        editable: false,
        validRange: {
          start: moment(new Date(Date.now() + 24 * 60 * 60 * 1000)).format('Y-MM-DD')
        },  
        weekNumbersWithinDays: true,
        navLinks: false, // can click day/week names to navigate views
        eventLimit: true, // allow "more" link when too many events
  
  
  
  events:[{"title":"17:30","start":"2018-09-27 17:30"},{"title":"18:30","start":"2018-09-27 18:30"},{"title":"19:30","start":"2018-09-27 19:30"},{"title":"20:30","start":"2018-09-27 20:30"},{"title":"21:30","start":"2018-09-27 21:30"},{"title":"22:30","start":"2018-09-27 22:30"},{"title":"23:30","start":"2018-09-27 23:30"},{"title":"00:30","start":"2018-09-28 00:30"},{"title":"01:30","start":"2018-09-28 01:30"},{"title":"02:30","start":"2018-09-28 02:30"},{"title":"15:30","start":"2018-09-28 15:30"},{"title":"17:30","start":"2018-09-28 17:30"},{"title":"18:30","start":"2018-09-28 18:30"},{"title":"19:30","start":"2018-09-28 19:30"},{"title":"20:30","start":"2018-09-28 20:30"},{"title":"21:30","start":"2018-09-28 21:30"},{"title":"22:30","start":"2018-09-28 22:30"},{"title":"23:30","start":"2018-09-28 23:30"},{"title":"00:30","start":"2018-09-29 00:30"},{"title":"01:30","start":"2018-09-29 01:30"},{"title":"02:30","start":"2018-09-29 02:30"},{"title":"15:30","start":"2018-09-29 15:30"},{"title":"17:30","start":"2018-09-29 17:30"},{"title":"18:30","start":"2018-09-29 18:30"},{"title":"19:30","start":"2018-09-29 19:30"},{"title":"20:30","start":"2018-09-29 20:30"},{"title":"21:30","start":"2018-09-29 21:30"},{"title":"22:30","start":"2018-09-29 22:30"},{"title":"23:30","start":"2018-09-29 23:30"},{"title":"00:30","start":"2018-09-30 00:30"},{"title":"01:30","start":"2018-09-30 01:30"},{"title":"02:30","start":"2018-09-30 02:30"},{"title":"17:30","start":"2018-09-30 17:30"},{"title":"18:30","start":"2018-09-30 18:30"},{"title":"19:30","start":"2018-09-30 19:30"},{"title":"20:30","start":"2018-09-30 20:30"},{"title":"21:30","start":"2018-09-30 21:30"},{"title":"22:30","start":"2018-09-30 22:30"},{"title":"23:30","start":"2018-09-30 23:30"},{"title":"00:30","start":"2018-10-01 00:30"},{"title":"01:30","start":"2018-10-01 01:30"},{"title":"02:30","start":"2018-10-01 02:30"}]
        });
  </code></pre>
  
  <p>The slots such as <code>2018-09-28 23:30</code> is being repeated two times</p>