Method _ensure_matching_resos

pandas/core/arrays/datetimelike.py:2074–2081

(self, other)

    # TODO: annotate other as DatetimeArray | TimedeltaArray | Timestamp | Timedelta
    #  with the return type matching input type.  TypeVar?
    def _ensure_matching_resos(self, other):
        if self._creso != other._creso:
            # Just as with Timestamp/Timedelta, we cast to the higher resolution
            if self._creso < other._creso:
                self = self.as_unit(other.unit)
            else:
                other = other.as_unit(self.unit)
        return self, other

    # --------------------------------------------------------------