<button type="button" class="btn text-primary" data-calendar-month="previous">
  <i class="fa fa-angle-left"></i>
</button>
<div class="dropdown">
  <button type="button" class="btn dropdown-toggle" data-toggle="dropdown"></button>
  <div class="dropdown-menu">
    <a href="#" class="dropdown-item" data-calendar-month="0">January</a>
    <a href="#" class="dropdown-item" data-calendar-month="1">February</a>
    <a href="#" class="dropdown-item" data-calendar-month="2">March</a>
    <a href="#" class="dropdo