How to use the cftime.__version__ function in cftime

delta_year = (date.month + months) // 12
    month = (date.month + months) % 12

    if month == 0:
        month = 12
        delta_year = delta_year - 1
    year = date.year + delta_year

    if day_option == "start":
        day = 1
    elif day_option == "end":
        reference = type(date)(year, month, 1)
        day = _days_in_month(reference)
    else:
        raise ValueError(day_option)
    if LooseVersion(cftime.__version__) < LooseVersion("1.0.4"):
        # dayofwk=-1 is required to update the dayofwk and dayofyr attributes of
        # the returned date object in versions of cftime between 1.0.2 and
        # 1.0.3.4.  It can be removed for versions of cftime greater than
        # 1.0.3.4.
        return date.replace(year=year, month=month, day=day, dayofwk=-1)
    else:
        return date.replace(year=year, month=month, day=day)

def runTest(self):
        # Get the real dates
        # skip this until cftime pull request #55 is in a released
        # version (1.0.1?). Otherwise, fix for issue #808 breaks this
        if parse_version(cftime.__version__) >= parse_version('1.0.1'):
            dates = []
            for file in self.files:
                f = Dataset(file)
                t = f.variables['time']
                dates.extend(num2date(t[:], t.units, t.calendar))
                f.close()

        # Compare with the MF dates
        f = MFDataset(self.files,check=True)
        t = f.variables['time']
        mfdates = num2date(t[:], t.units, t.calendar)

        T = MFTime(t)
        assert_equal(len(T), len(t))
        assert_equal(T.shape, t.shape)
        assert_equal(T.dimensions, t.dimensions)

dates.extend(num2date(t[:], t.units, calendar))
                f.close()

        # Compare with the MF dates
        f = MFDataset(self.files,check=True)
        t = f.variables['time']

        T = MFTime(t, calendar=calendar)
        assert_equal(T.calendar, calendar)
        assert_equal(len(T), len(t))
        assert_equal(T.shape, t.shape)
        assert_equal(T.dimensions, t.dimensions)
        assert_equal(T.typecode(), t.typecode())
        # skip this until cftime pull request #55 is in a released
        # version (1.0.1?). Otherwise, fix for issue #808 breaks this
        if parse_version(cftime.__version__) >= parse_version('1.0.1'):
            assert_array_equal(num2date(T[:], T.units, T.calendar), dates)
        assert_equal(date2index(datetime.datetime(1980, 1, 2), T), 366)
        f.close()

        # Test exception is raised when no calendar attribute is available on the
        # time variable.
        with MFDataset(self.files, check=True) as ds:
            with self.assertRaises(ValueError):
                MFTime(ds.variables['time'])

        # Test exception is raised when the calendar attribute is different on the
        # variables. First, add calendar attributes to file. Note this will modify
        # the files inplace.
        calendars = ['standard', 'gregorian']
        for idx, f in enumerate(self.files):
            with Dataset(f, 'a') as ds:

def runTest(self):
        # The test files have no calendar attribute on the time variable.
        calendar = 'standard'

        # Get the real dates
        # skip this until cftime pull request #55 is in a released
        # version (1.0.1?). Otherwise, fix for issue #808 breaks this
        if parse_version(cftime.__version__) >= parse_version('1.0.1'):
            dates = []
            for file in self.files:
                f = Dataset(file)
                t = f.variables['time']
                dates.extend(num2date(t[:], t.units, calendar))
                f.close()

        # Compare with the MF dates
        f = MFDataset(self.files,check=True)
        t = f.variables['time']

        T = MFTime(t, calendar=calendar)
        assert_equal(T.calendar, calendar)
        assert_equal(len(T), len(t))
        assert_equal(T.shape, t.shape)
        assert_equal(T.dimensions, t.dimensions)

dates.extend(num2date(t[:], t.units, t.calendar))
                f.close()

        # Compare with the MF dates
        f = MFDataset(self.files,check=True)
        t = f.variables['time']
        mfdates = num2date(t[:], t.units, t.calendar)

        T = MFTime(t)
        assert_equal(len(T), len(t))
        assert_equal(T.shape, t.shape)
        assert_equal(T.dimensions, t.dimensions)
        assert_equal(T.typecode(), t.typecode())
        # skip this until cftime pull request #55 is in a released
        # version (1.0.1?). Otherwise, fix for issue #808 breaks this
        if parse_version(cftime.__version__) >= parse_version('1.0.1'):
            assert_array_equal(num2date(T[:], T.units, T.calendar), dates)
        assert_equal(date2index(datetime.datetime(1980, 1, 2), T), 366)
        f.close()

def f(self, min_cftime_version=min_cftime_version):
        import cftime

        version = cftime.__version__

        if LooseVersion(version) >= LooseVersion(min_cftime_version):
            return get_date_field(self._data, name)
        else:
            raise ImportError(
                "The {!r} accessor requires a minimum "
                "version of cftime of {}. Found an "
                "installed version of {}.".format(name, min_cftime_version, version)
            )

def _parse_iso8601_with_reso(date_type, timestr):
    import cftime

    default = date_type(1, 1, 1)
    result = parse_iso8601(timestr)
    replace = {}

    for attr in ["year", "month", "day", "hour", "minute", "second"]:
        value = result.get(attr, None)
        if value is not None:
            # Note ISO8601 conventions allow for fractional seconds.
            # TODO: Consider adding support for sub-second resolution?
            replace[attr] = int(value)
            resolution = attr
    if LooseVersion(cftime.__version__) < LooseVersion("1.0.4"):
        # dayofwk=-1 is required to update the dayofwk and dayofyr attributes of
        # the returned date object in versions of cftime between 1.0.2 and
        # 1.0.3.4.  It can be removed for versions of cftime greater than
        # 1.0.3.4.
        replace["dayofwk"] = -1
    return default.replace(**replace), resolution