Function _check_date_is_after_shift

xarray/coding/times.py:444–455

(
    date: pd.Timestamp | datetime | CFTimeDatetime, calendar: str
)

def _check_date_is_after_shift(
    date: pd.Timestamp | datetime | CFTimeDatetime, calendar: str
) -> None:
    # if we have gregorian/standard we need to raise
    # if we are outside the well-defined date range
    # proleptic_gregorian and standard/gregorian are only equivalent
    # if reference date and date range is >= 1582-10-15
    if calendar != "proleptic_gregorian" and date < type(date)(1582, 10, 15):
        raise OutOfBoundsDatetime(
            f"Dates before 1582-10-15 cannot be decoded "
            f"with pandas using {calendar!r} calendar: {date}"
        )


def _check_higher_resolution(