code: function findMonthElement(element, date) {
      var months = element.querySelectorAll('[md-calendar-month-body]');
      var monthHeader = dateLocale.monthHeaderFormatter(date);
      var month;
  
      for (var i = 0; i < months.length; i++) {
        month = months[i];
        if (month.querySelector('tr:first-child td:first-child').textContent === monthHeader) {
          return month;
        }
      }
      return null;
    }
docs: Finds a month `tbody` in the calendar element given a date.