em" data-calendar-month="10">November</a>
    <a href="#" class="dropdown-item" data-calendar-month="11">December</a>
  </div>
</div>
<input type="number" class="form-control" pattern="[0-9]*" maxlength="4">
<button type="button" class="btn text-primary" data-calendar-month="next">
  <i class="fa fa-angle-right"></i>
</button>
