<div class="form-group">
   <input class="time ui-timepicker-input" id="FromTime" name="FromTime" type="text" value="" autocomplete="off">
</div>
<div class="form-group">
   <input class="time ui-timepicker-input" id="ToTime" name="FromTime" type="text" value="" autocomplete="off">
</div>
 $(document).ready(function () {
     $('#ToTime').timepicker();
     $('#FromTime').timepicker();
 });

$('#FromTime').timepicker().on('changeTime.timepicker', function(e) {
   //how to get selected time here
   //set ToTime value with a difference of 1 hour ie if 12:30 am selected set ToTime as 1:30 am
});