[howto] Add a datetimepicker in Odoo website

datetimepicker_website_template_odoo.xml

<div class="form-group">
    <div class="input-group datetime"
         id="datetimepickerID"
         data-target-input="nearest">
        <input type="text"
               class="form-control datetimepicker-input"
               data-target="#datetimepickerID"
               name="my_datetimepicker"/>
        <div class="input-group-append"
             data-target="#datetimepickerID"
             data-toggle="datetimepicker">
            <div class="input-group-text"><i class="fa fa-calendar"></i></div>
        </div>
    </div>
    <script type="text/javascript">
        $(function () {
            $('#datetimepickerID').datetimepicker();
        });
    </script>
</div>