Function precise_diff

src/pendulum/_helpers.py:161–306

Calculate a precise difference between two datetimes. :param d1: The first datetime :param d2: The second datetime

(
    d1: datetime.datetime | datetime.date, d2: datetime.datetime | datetime.date
)

def precise_diff(
    d1: datetime.datetime | datetime.date, d2: datetime.datetime | datetime.date
) -> PreciseDiff:
    """
    Calculate a precise difference between two datetimes.

    :param d1: The first datetime
    :param d2: The second datetime
    """
    sign = 1

    if d1 == d2:
        return PreciseDiff(0, 0, 0, 0, 0, 0, 0, 0)

    tzinfo1: datetime.tzinfo | None = (
        d1.tzinfo if isinstance(d1, datetime.datetime) else None
    )
    tzinfo2: datetime.tzinfo | None = (
        d2.tzinfo if isinstance(d2, datetime.datetime) else None
    )

    if (tzinfo1 is None and tzinfo2 is not None) or (
        tzinfo2 is None and tzinfo1 is not None
    ):
        raise ValueError(
            "Comparison between naive and aware datetimes is not supported"
        )

    if d1 > d2:
        d1, d2 = d2, d1
        sign = -1

    d_diff = 0
    hour_diff = 0
    min_diff = 0
    sec_diff = 0
    mic_diff = 0
    total_days = _day_number(d2.year, d2.month, d2.day) - _day_number(
        d1.year, d1.month, d1.day
    )
    in_same_tz = False
    tz1 = None
    tz2 = None

    # Trying to figure out the timezone names
    # If we can't find them, we assume different timezones
    if tzinfo1 and tzinfo2:
        tz1 = _get_tzinfo_name(tzinfo1)
        tz2 = _get_tzinfo_name(tzinfo2)

        in_same_tz = tz1 == tz2 and tz1 is not None

    if isinstance(d2, datetime.datetime):
        if isinstance(d1, datetime.datetime):
            # If we are not in the same timezone
            # we need to adjust
            #
            # We also need to adjust if we do not