Bootstrap datetimepicker: show calendar pop-up when a user clicks on input

Is there a way to show calendar when a user clicks on input as well? Right now I have to click on the calendar icon which will then show calendar.

HTML:

<div class='input-group date' id='datetimepicker1'>
  <input type='text' class="form-control" />
  <span class="input-group-addon"><span class="glyphicon glyphicon-calendar"></span>
  </span>
</div>

JavaScript:

$(function() {
  $('#datetimepicker1').datetimepicker();
});

Example: https://jsfiddle.net/8jpmkcr5/81/