Returns a curve with holidays between start_date and end_date

        Parameters
        ----------
        start : starting date, datetime-like, optional
        end : ending date, datetime-like, optional
        return_name : bool, optional
            If True, return a series that has dates and holiday names.
            False will only return a DatetimeIndex of dates.

        Returns
        -------
            DatetimeIndex of holidays

def holidays(self, start=None, end=None, return_name=False):
        """
        Returns a curve with holidays between start_date and end_date

        Parameters
        ----------
        start : starting date, datetime-like, optional
        end : ending date, datetime-like, optional
        return_name : bool, optional
            If True, return a series that has dates and holiday names.
            False will only return a DatetimeIndex of dates.

        Returns
        -------
            DatetimeIndex of holidays
        """
        if self.rules is None:
            raise Exception('Holiday Calendar {name} does not have any '
                            'rules specified'.format(name=self.name))

        if start is None:
            start = AbstractHolidayCalendar.start_date

        if end is None:
            end = AbstractHolidayCalendar.end_date

        start = Timestamp(start)
        end = Timestamp(end)

        holidays = None
        # If we don't have a cache or the dates are outside the prior cache, we
        # get them again
        if (self._cache is None or start < self._cache[0] or
                end > self._cache[1]):
            for rule in self.rules:
                rule_holidays = rule.dates(start, end, return_name=True)

                if holidays is None:
                    holidays = rule_holidays
                else:
                    holidays = holidays.append(rule_holidays)

            self._cache = (start, end, holidays.sort_index())

        holidays = self._cache[2]
        holidays = holidays[start:end]

        if return_name:
            return holidays
        else:
            return holidays.index