fullcalendar

HTML

<script src="https://cdnjs.cloudflare.com/ajax/libs/moment.js/2.18.1/moment.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/jqueryui/1.12.1/jquery-ui.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/fullcalendar/3.4.0/fullcalendar.min.js"></script>
<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/fullcalendar/3.4.0/fullcalendar.min.css">
<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/jqueryui/1.12.1/jquery-ui.min.css">
<div id='calendar'></div>

JavaScript

$(document).ready(function() {
  $('#calendar').fullCalendar({
    dayRender: function(date, cell) {
      var today = moment('2017-09-11T00:00Z');
      if (date.isSame(today, "day")) {
        cell.css("background-color", "red");
      }
    },
    defaultView: 'month',
    header: {
      left: 'prev,next today',
      center: 'title',
      right: 'month,agendaWeek,agendaDay'
    }
  });

});