<link rel="stylesheet" type="text/css" href="owm-datepicker/owm.datepicker.css">
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.1.1/jquery.min.js"></script>
<script type="text/javascript" src="owm-datepicker/owm.datepicker.js"></script>


var dp = new OWMDatePicker('datepicker');
dp.onChange(function(from, to) {
  console.log('from: ', from, '\nto: ', to);
});
dp.loadDates(data);