How to use the tomlkit._utils.parse_rfc3339 function in tomlkit

def test_parse_rfc3339_datetime(string, expected):
    assert parse_rfc3339(string) == expected

from tomlkit._utils import parse_rfc3339
from tomlkit.exceptions import TOMLKitError


def to_bool(s):
    assert s in ["true", "false"]

    return s == "true"


stypes = {
    "string": unicode,
    "bool": to_bool,
    "integer": int,
    "float": float,
    "datetime": parse_rfc3339,
}


def untag(value):
    if isinstance(value, list):
        return [untag(i) for i in value]
    elif "type" in value and "value" in value and len(value) == 2:
        if value["type"] in stypes:
            val = decode(value["value"])

            return stypes[value["type"]](val)
        elif value["type"] == "array":
            return [untag(i) for i in value["value"]]
        else:
            raise Exception("Unsupported type {}".format(value["type"]))
    else:

def test_parse_rfc3339_time(string, expected):
    assert parse_rfc3339(string) == expected

def date(raw):  # type: (str) -> Date
    value = parse_rfc3339(raw)
    if not isinstance(value, _datetime.date):
        raise ValueError("date() only accepts date strings.")

    return item(value)

return item

            raise self.parse_error(InvalidNumberError)
        elif c in string.digits:
            # Integer, Float, Date, Time or DateTime
            while self._current not in " \t\n\r#,]}" and self.inc():
                pass

            raw = self.extract()

            m = RFC_3339_LOOSE.match(raw)
            if m:
                if m.group(1) and m.group(5):
                    # datetime
                    try:
                        dt = parse_rfc3339(raw)
                        return DateTime(
                            dt.year,
                            dt.month,
                            dt.day,
                            dt.hour,
                            dt.minute,
                            dt.second,
                            dt.microsecond,
                            dt.tzinfo,
                            trivia,
                            raw,
                        )
                    except ValueError:
                        raise self.parse_error(InvalidDateTimeError)

                if m.group(1):

dt.month,
                            dt.day,
                            dt.hour,
                            dt.minute,
                            dt.second,
                            dt.microsecond,
                            dt.tzinfo,
                            trivia,
                            raw,
                        )
                    except ValueError:
                        raise self.parse_error(InvalidDateTimeError)

                if m.group(1):
                    try:
                        dt = parse_rfc3339(raw)
                        return Date(dt.year, dt.month, dt.day, trivia, raw)
                    except ValueError:
                        raise self.parse_error(InvalidDateError)

                if m.group(5):
                    try:
                        t = parse_rfc3339(raw)
                        return Time(
                            t.hour,
                            t.minute,
                            t.second,
                            t.microsecond,
                            t.tzinfo,
                            trivia,
                            raw,
                        )

trivia,
                            raw,
                        )
                    except ValueError:
                        raise self.parse_error(InvalidDateTimeError)

                if m.group(1):
                    try:
                        dt = parse_rfc3339(raw)
                        return Date(dt.year, dt.month, dt.day, trivia, raw)
                    except ValueError:
                        raise self.parse_error(InvalidDateError)

                if m.group(5):
                    try:
                        t = parse_rfc3339(raw)
                        return Time(
                            t.hour,
                            t.minute,
                            t.second,
                            t.microsecond,
                            t.tzinfo,
                            trivia,
                            raw,
                        )
                    except ValueError:
                        raise self.parse_error(InvalidTimeError)

            item = self._parse_number(raw, trivia)
            if item is not None:
                return item