How to use the bpk-component-calendar.DateUtils.daysInMonth function in bpk-component-calendar

const monthItemHeights = months.map(month => {
      const firstDayOffset = (month.getDay() + 7 - props.weekStartsOn) % 7;
      const monthLength = DateUtils.daysInMonth(
        month.getYear(),
        month.getMonth(),
      );
      const calendarGridSpaces = firstDayOffset + monthLength;
      const rowCount = Math.ceil(calendarGridSpaces / COLUMN_COUNT);
      return BASE_MONTH_ITEM_HEIGHT + ROW_HEIGHT * rowCount;
    });