import datetime

import dateutil.parser

    cast,

class RTDateTime(datetime.datetime):

    """Construct datetime objects from strings returned by RT

    Typical usage looks like::

        ticket = rt_client.get_ticket(...)

        created = RTDateTime(ticket.get('Created'))

    """

    # Normally I'd just write a function to do this, but having a dedicated

    # class helps support query-report: the class can pull double duty to both

    # parse the data from RT, and determine proper output formatting.

    # The RT REST API returns datetimes in the user's configured timezone, and

    # there doesn't seem to be any API call that tells you what that is. You

    # have to live with the object being timezone-naive.

    def __new__(cls, source: str) -> 'RTDateTime':

        if not source or source == 'Not set':

            retval = datetime.datetime.min

        else:

            retval = dateutil.parser.parse(source)

        return cast(RTDateTime, retval)

        'python-dateutil>=2.7',  # Debian:python3-dateutil

import datetime

@pytest.mark.parametrize('arg,exp_num,exp_offset', [

    # These correspond to the different datetime formats available through

    # RT's user settings.

    ('Mon Mar 1 01:01:01 2021', 1, None),

    ('2021-03-02 02:02:02', 2, None),

    ('2021-03-03T03:03:03-0500', 3, -18000),

    ('Thu, 4 Mar 2021 04:04:04 -0600', 4, -21600),

    ('Fri, 5 Mar 2021 05:05:05 GMT', 5, 0),

    ('20210306T060606Z', 6, 0),

    ('Sun, Mar 7, 2021 07:07:07 AM', 7, None),

    ('Sun, Mar 14, 2021 02:14:14 PM', 14, None),

])

def test_rt_datetime(arg, exp_num, exp_offset):

    actual = rtutil.RTDateTime(arg)

    assert actual.year == 2021

    assert actual.month == 3

    assert actual.day == exp_num

    assert actual.hour == exp_num

    assert actual.minute == exp_num

    assert actual.second == exp_num

    if exp_offset is None:

        assert actual.tzinfo is None

    else:

        assert actual.tzinfo.utcoffset(None).total_seconds() == exp_offset

@pytest.mark.parametrize('arg', ['Not set', '', None])

def test_rt_datetime_empty(arg):

    actual = rtutil.RTDateTime(arg)

    assert actual == datetime.datetime.min

    assert actual.tzinfo is None