JS DateTimePicker onChange event not working

JS datetimepicker onChange event not working at all.

I've tried OnSelect, OnClose, OnChange, OnHide, OnChangeMonth to trigger datetimepicker event, but none of them works.

<input type="text" class="form-control datetimepicker-input" id="Datetimepicker" data-toggle="datetimepicker" data-target="#Datetimepicker" autocomplete="off" style="width: 200px;" />

$("#Datetimepicker").datetimepicker({
    format: 'MMM,YYYY',
    defaultDate: today,
    onSelect: function () {
        alert("It works!");
    }
})

$("#Datetimepicker").datetimepicker("change",function(){
    alert("It works!")});


$("#Datetimepicker").datetimepicker("changeDate",function(){
    alert("It works!")});

I've tried many ways, but still none of them working. Do I need to provide some other js library in order to make it work? Appreciate your help.