Method rollback

xarray/coding/cftime_offsets.py:604–609

Roll date backward to nearest end of year

(self, date)

            return date + YearEnd(month=self.month)

    def rollback(self, date):
        """Roll date backward to nearest end of year"""
        if self.onOffset(date):
            return date
        else:
            return date - YearEnd(month=self.month)


class Day(BaseCFTimeOffset):