Method _round_via_method

xarray/coding/cftimeindex.py:710–730

Round dates using a specified method.

(self, freq, method)

        return infer_freq(self)

    def _round_via_method(self, freq, method):
        """Round dates using a specified method."""
        from xarray.coding.cftime_offsets import CFTIME_TICKS, Day, to_offset

        if not self._data.size:
            return CFTimeIndex(np.array(self))

        offset = to_offset(freq)
        if isinstance(offset, Day):
            # Following pandas, "In the 'round' context, Day unambiguously
            # means 24h, not calendar-day"
            offset_as_timedelta = timedelta(days=offset.n)
        elif isinstance(offset, CFTIME_TICKS):
            offset_as_timedelta = offset.as_timedelta()
        else:
            raise ValueError(f"{offset} is a non-fixed frequency")

        unit = _total_microseconds(offset_as_timedelta)
        values = self.asi8
        rounded = method(values, unit)
        return _cftimeindex_from_i8(rounded, self.date_type, self.name)

    def floor(self, freq):
        """Round dates down to fixed frequency.