Python datetime.combine() Examples

def test_combine(self):
        d = date(2002, 3, 4)
        t = time(18, 45, 3, 1234)
        expected = self.theclass(2002, 3, 4, 18, 45, 3, 1234)
        combine = self.theclass.combine
        dt = combine(d, t)
        self.assertEqual(dt, expected)

        dt = combine(time=t, date=d)
        self.assertEqual(dt, expected)

        self.assertEqual(d, dt.date())
        self.assertEqual(t, dt.time())
        self.assertEqual(dt, combine(dt.date(), dt.time()))

        self.assertRaises(TypeError, combine) # need an arg
        self.assertRaises(TypeError, combine, d) # need two args
        self.assertRaises(TypeError, combine, t, d) # args reversed
        self.assertRaises(TypeError, combine, d, t, 1) # too many args
        self.assertRaises(TypeError, combine, "date", "time") # wrong types 

def till(time_in):
  d_now = datetime.now()
  time_today = datetime.combine(datetime.today(), time_in)
  if d_now < time_today:
    return time_today - d_now 
  return (time_today + a_day) - d_now 

def test_combine(self):
        d = date(2002, 3, 4)
        t = time(18, 45, 3, 1234)
        expected = self.theclass(2002, 3, 4, 18, 45, 3, 1234)
        combine = self.theclass.combine
        dt = combine(d, t)
        self.assertEqual(dt, expected)

        dt = combine(time=t, date=d)
        self.assertEqual(dt, expected)

        self.assertEqual(d, dt.date())
        self.assertEqual(t, dt.time())
        self.assertEqual(dt, combine(dt.date(), dt.time()))

        self.assertRaises(TypeError, combine) # need an arg
        self.assertRaises(TypeError, combine, d) # need two args
        self.assertRaises(TypeError, combine, t, d) # args reversed
        self.assertRaises(TypeError, combine, d, t, 1) # too many args
        self.assertRaises(TypeError, combine, "date", "time") # wrong types 

def test_combine(self):
        met = FixedOffset(60, "MET")
        d = date(2002, 3, 4)
        tz = time(18, 45, 3, 1234, tzinfo=met)
        dt = datetime.combine(d, tz)
        self.assertEqual(dt, datetime(2002, 3, 4, 18, 45, 3, 1234,
                                        tzinfo=met)) 

def test_combine(self):
        d = date(2002, 3, 4)
        t = time(18, 45, 3, 1234)
        expected = self.theclass(2002, 3, 4, 18, 45, 3, 1234)
        combine = self.theclass.combine
        dt = combine(d, t)
        self.assertEqual(dt, expected)

        dt = combine(time=t, date=d)
        self.assertEqual(dt, expected)

        self.assertEqual(d, dt.date())
        self.assertEqual(t, dt.time())
        self.assertEqual(dt, combine(dt.date(), dt.time()))

        self.assertRaises(TypeError, combine) # need an arg
        self.assertRaises(TypeError, combine, d) # need two args
        self.assertRaises(TypeError, combine, t, d) # args reversed
        self.assertRaises(TypeError, combine, d, t, 1) # too many args
        self.assertRaises(TypeError, combine, "date", "time") # wrong types 

def diff_dates(self, date1, date2):
        try:
            try:
                d1 = datetime.strptime(date1, '%d/%m/%Y')
            except:
                d1 = datetime.combine(date1, datetime.min.time())
            d2 = datetime.strptime(date2, '%d/%m/%Y')
            diff = abs((d1 - d2).days)
            return str(diff)
        except:
            return "diff_dates_error"

    # Try to sum each row from a given column in a table (each value from the given column must be integer)
    # table_var : this is the variable name of the table in forms.
    # id_colonne : the id of the column in the table!
    # price : default value = 1.
    # return =  [sum of all row in given column] * price. 

def test_combine(self):
        d = date(2002, 3, 4)
        t = time(18, 45, 3, 1234)
        expected = self.theclass(2002, 3, 4, 18, 45, 3, 1234)
        combine = self.theclass.combine
        dt = combine(d, t)
        self.assertEqual(dt, expected)

        dt = combine(time=t, date=d)
        self.assertEqual(dt, expected)

        self.assertEqual(d, dt.date())
        self.assertEqual(t, dt.time())
        self.assertEqual(dt, combine(dt.date(), dt.time()))

        self.assertRaises(TypeError, combine) # need an arg
        self.assertRaises(TypeError, combine, d) # need two args
        self.assertRaises(TypeError, combine, t, d) # args reversed
        self.assertRaises(TypeError, combine, d, t, 1) # too many args
        self.assertRaises(TypeError, combine, "date", "time") # wrong types 

def test_class_ops_pytz(self):
        tm._skip_if_no_pytz()
        from pytz import timezone

        def compare(x, y):
            self.assertEqual(int(Timestamp(x).value / 1e9), int(Timestamp(y).value / 1e9))

        compare(Timestamp.now(), datetime.now())
        compare(Timestamp.now('UTC'), datetime.now(timezone('UTC')))
        compare(Timestamp.utcnow(), datetime.utcnow())
        compare(Timestamp.today(), datetime.today())
        current_time = calendar.timegm(datetime.now().utctimetuple())
        compare(Timestamp.utcfromtimestamp(current_time),
                datetime.utcfromtimestamp(current_time))
        compare(Timestamp.fromtimestamp(current_time),
                datetime.fromtimestamp(current_time))

        date_component = datetime.utcnow()
        time_component = (date_component + timedelta(minutes=10)).time()
        compare(Timestamp.combine(date_component, time_component),
                datetime.combine(date_component, time_component)) 

def test_class_ops_dateutil(self):
        tm._skip_if_no_dateutil()
        from dateutil.tz import tzutc

        def compare(x,y):
            self.assertEqual(int(np.round(Timestamp(x).value/1e9)), int(np.round(Timestamp(y).value/1e9)))

        compare(Timestamp.now(),datetime.now())
        compare(Timestamp.now('UTC'), datetime.now(tzutc()))
        compare(Timestamp.utcnow(),datetime.utcnow())
        compare(Timestamp.today(),datetime.today())
        current_time = calendar.timegm(datetime.now().utctimetuple())
        compare(Timestamp.utcfromtimestamp(current_time),
                datetime.utcfromtimestamp(current_time))
        compare(Timestamp.fromtimestamp(current_time),
                datetime.fromtimestamp(current_time))

        date_component = datetime.utcnow()
        time_component = (date_component + timedelta(minutes=10)).time()
        compare(Timestamp.combine(date_component, time_component),
                datetime.combine(date_component, time_component)) 

def test_combine(self):
        met = FixedOffset(60, "MET")
        d = date(2002, 3, 4)
        tz = time(18, 45, 3, 1234, tzinfo=met)
        dt = datetime.combine(d, tz)
        self.assertEqual(dt, datetime(2002, 3, 4, 18, 45, 3, 1234,
                                        tzinfo=met)) 

def test_bug_1028306(self):
        # Trying to compare a date to a datetime should act like a mixed-
        # type comparison, despite that datetime is a subclass of date.
        as_date = date.today()
        as_datetime = datetime.combine(as_date, time())
        self.assertTrue(as_date != as_datetime)
        self.assertTrue(as_datetime != as_date)
        self.assertFalse(as_date == as_datetime)
        self.assertFalse(as_datetime == as_date)
        self.assertRaises(TypeError, lambda: as_date < as_datetime)
        self.assertRaises(TypeError, lambda: as_datetime < as_date)
        self.assertRaises(TypeError, lambda: as_date <= as_datetime)
        self.assertRaises(TypeError, lambda: as_datetime <= as_date)
        self.assertRaises(TypeError, lambda: as_date > as_datetime)
        self.assertRaises(TypeError, lambda: as_datetime > as_date)
        self.assertRaises(TypeError, lambda: as_date >= as_datetime)
        self.assertRaises(TypeError, lambda: as_datetime >= as_date)

        # Neverthelss, comparison should work with the base-class (date)
        # projection if use of a date method is forced.
        self.assertTrue(as_date.__eq__(as_datetime))
        different_day = (as_date.day + 1) % 20 + 1
        self.assertFalse(as_date.__eq__(as_datetime.replace(day=different_day)))

        # And date should compare with other subclasses of date.  If a
        # subclass wants to stop this, it's up to the subclass to do so.
        date_sc = SubclassDate(as_date.year, as_date.month, as_date.day)
        self.assertEqual(as_date, date_sc)
        self.assertEqual(date_sc, as_date)

        # Ditto for datetimes.
        datetime_sc = SubclassDatetime(as_datetime.year, as_datetime.month,
                                       as_date.day, 0, 0, 0)
        self.assertEqual(as_datetime, datetime_sc)
        self.assertEqual(datetime_sc, as_datetime) 

def test_bug_1028306(self):
        # Trying to compare a date to a datetime should act like a mixed-
        # type comparison, despite that datetime is a subclass of date.
        as_date = date.today()
        as_datetime = datetime.combine(as_date, time())
        self.assertTrue(as_date != as_datetime)
        self.assertTrue(as_datetime != as_date)
        self.assertFalse(as_date == as_datetime)
        self.assertFalse(as_datetime == as_date)
        self.assertRaises(TypeError, lambda: as_date < as_datetime)
        self.assertRaises(TypeError, lambda: as_datetime < as_date)
        self.assertRaises(TypeError, lambda: as_date <= as_datetime)
        self.assertRaises(TypeError, lambda: as_datetime <= as_date)
        self.assertRaises(TypeError, lambda: as_date > as_datetime)
        self.assertRaises(TypeError, lambda: as_datetime > as_date)
        self.assertRaises(TypeError, lambda: as_date >= as_datetime)
        self.assertRaises(TypeError, lambda: as_datetime >= as_date)

        # Nevertheless, comparison should work with the base-class (date)
        # projection if use of a date method is forced.
        self.assertTrue(as_date.__eq__(as_datetime))
        different_day = (as_date.day + 1) % 20 + 1
        self.assertFalse(as_date.__eq__(as_datetime.replace(day=different_day)))

        # And date should compare with other subclasses of date.  If a
        # subclass wants to stop this, it's up to the subclass to do so.
        date_sc = SubclassDate(as_date.year, as_date.month, as_date.day)
        self.assertEqual(as_date, date_sc)
        self.assertEqual(date_sc, as_date)

        # Ditto for datetimes.
        datetime_sc = SubclassDatetime(as_datetime.year, as_datetime.month,
                                       as_date.day, 0, 0, 0)
        self.assertEqual(as_datetime, datetime_sc)
        self.assertEqual(datetime_sc, as_datetime) 

def Now(dt):
    """ A context processor that sets the current datetime. """
    from datetime import date, time, datetime
    try:
        from unittest import mock
    except ImportError:
        import mock

    if isinstance(dt, date) and not isinstance(dt, datetime):
        dt = datetime.combine(dt, time(0))

    return mock.patch('{}._now'.format(__name__), lambda: dt) 

def Now(dt):
    """ A context processor that sets the current datetime. """
    from datetime import date, time, datetime
    try:
        from unittest import mock
    except ImportError:
        import mock

    if isinstance(dt, date) and not isinstance(dt, datetime):
        dt = datetime.combine(dt, time(0))

    return mock.patch('{}._now'.format(__name__), lambda: dt) 

def test_combine(self):
        met = FixedOffset(60, "MET")
        d = date(2002, 3, 4)
        tz = time(18, 45, 3, 1234, tzinfo=met)
        dt = datetime.combine(d, tz)
        self.assertEqual(dt, datetime(2002, 3, 4, 18, 45, 3, 1234,
                                        tzinfo=met)) 

def test_bug_1028306(self):
        # Trying to compare a date to a datetime should act like a mixed-
        # type comparison, despite that datetime is a subclass of date.
        as_date = date.today()
        as_datetime = datetime.combine(as_date, time())
        self.assertTrue(as_date != as_datetime)
        self.assertTrue(as_datetime != as_date)
        self.assertFalse(as_date == as_datetime)
        self.assertFalse(as_datetime == as_date)
        self.assertRaises(TypeError, lambda: as_date < as_datetime)
        self.assertRaises(TypeError, lambda: as_datetime < as_date)
        self.assertRaises(TypeError, lambda: as_date <= as_datetime)
        self.assertRaises(TypeError, lambda: as_datetime <= as_date)
        self.assertRaises(TypeError, lambda: as_date > as_datetime)
        self.assertRaises(TypeError, lambda: as_datetime > as_date)
        self.assertRaises(TypeError, lambda: as_date >= as_datetime)
        self.assertRaises(TypeError, lambda: as_datetime >= as_date)

        # Neverthelss, comparison should work with the base-class (date)
        # projection if use of a date method is forced.
        self.assertTrue(as_date.__eq__(as_datetime))
        different_day = (as_date.day + 1) % 20 + 1
        self.assertFalse(as_date.__eq__(as_datetime.replace(day=different_day)))

        # And date should compare with other subclasses of date.  If a
        # subclass wants to stop this, it's up to the subclass to do so.
        date_sc = SubclassDate(as_date.year, as_date.month, as_date.day)
        self.assertEqual(as_date, date_sc)
        self.assertEqual(date_sc, as_date)

        # Ditto for datetimes.
        datetime_sc = SubclassDatetime(as_datetime.year, as_datetime.month,
                                       as_date.day, 0, 0, 0)
        self.assertEqual(as_datetime, datetime_sc)
        self.assertEqual(datetime_sc, as_datetime) 

def __call__(self, data):
        '''
        Params:
          - data: the data source to filter/process

        Returns:
          - False (always) because this filter does not remove bars from the
            stream
        '''
        # Get time of current (from data source) bar
        dtime = datetime.combine(data.datetime.date(), self.p.endtime)
        data.datetime[0] = data.date2num(dtime)
        return False 

def test_combine(self):
        met = FixedOffset(60, "MET")
        d = date(2002, 3, 4)
        tz = time(18, 45, 3, 1234, tzinfo=met)
        dt = datetime.combine(d, tz)
        self.assertEqual(dt, datetime(2002, 3, 4, 18, 45, 3, 1234,
                                        tzinfo=met)) 

def test_bug_1028306(self):
        # Trying to compare a date to a datetime should act like a mixed-
        # type comparison, despite that datetime is a subclass of date.
        as_date = date.today()
        as_datetime = datetime.combine(as_date, time())
        self.assert_(as_date != as_datetime)
        self.assert_(as_datetime != as_date)
        self.assert_(not as_date == as_datetime)
        self.assert_(not as_datetime == as_date)
        self.assertRaises(TypeError, lambda: as_date < as_datetime)
        self.assertRaises(TypeError, lambda: as_datetime < as_date)
        self.assertRaises(TypeError, lambda: as_date <= as_datetime)
        self.assertRaises(TypeError, lambda: as_datetime <= as_date)
        self.assertRaises(TypeError, lambda: as_date > as_datetime)
        self.assertRaises(TypeError, lambda: as_datetime > as_date)
        self.assertRaises(TypeError, lambda: as_date >= as_datetime)
        self.assertRaises(TypeError, lambda: as_datetime >= as_date)

        # Neverthelss, comparison should work with the base-class (date)
        # projection if use of a date method is forced.
        self.assert_(as_date.__eq__(as_datetime))
        different_day = (as_date.day + 1) % 20 + 1
        self.assert_(not as_date.__eq__(as_datetime.replace(day=
                                                     different_day)))

        # And date should compare with other subclasses of date.  If a
        # subclass wants to stop this, it's up to the subclass to do so.
        date_sc = SubclassDate(as_date.year, as_date.month, as_date.day)
        self.assertEqual(as_date, date_sc)
        self.assertEqual(date_sc, as_date)

        # Ditto for datetimes.
        datetime_sc = SubclassDatetime(as_datetime.year, as_datetime.month,
                                       as_date.day, 0, 0, 0)
        self.assertEqual(as_datetime, datetime_sc)
        self.assertEqual(datetime_sc, as_datetime) 

def http_error_422(self, req, fp, code, msg, hdrs):

        s = fp.read().decode(encoding='UTF-8')
        data = json.loads(s)

        logging.info('Received HTTP Error 422')
        logging.debug(data)

        if 'Failed to parse date' in data['reason']:
            logging.error(req.get_full_url())
            logging.error(data)
            return

        if 'Requested date range is invalid for this system' in data['reason']:
            logging.error(req.get_full_url())
            logging.error(data)
            return

        startAt = self.dtt.datetimeify('start_at',data['start_at'])
        lastInt = self.dtt.datetimeify('last_interval', data['last_interval'])

        if startAt > lastInt:
            endAt = self.dtt.datetimeify('end_at',data['end_at'])
            startAt = dt.combine(endAt.date(),datetime.time())

            s,n,pa,pr,q,f = p.urlparse(req.get_full_url())
            params = dict(p.parse_qsl(q))
            params['start_at'] = self.dtt.stringify('start_at',
                    startAt.timestamp())
            qstring = p.urlencode(params)
            url = p.urlunparse((s,n,pa,pr,qstring,f))
            return r.build_opener(self).open(url)
        #handle other potential error cases 

def summary(self, system_id, no_cache = False, **kwargs):
        '''Get the system summary'''

        if no_cache is True:
            summary = super(CachingEnphaseInterface,self)._execQuery(
                system_id,'summary',kwargs)
        else:
            q = 'select * from summary where system_id = ? and summary_date = ?'

            #summary_date defaults to midnight local time today
            default_date = dt.datetime.combine(dt.date.today(),dt.time(0))
            summary_date = kwargs.get('summary_date',default_date)
            params = (system_id,summary_date.isoformat())

            with self.engine.connect() as con:
                summary = pd.read_sql(
                        q, 
                        con.connection, 
                        index_col=['system_id','summary_date'], 
                        parse_dates=['summary_date'],
                        params = params)

                if len(summary) < 1:
                    summary = super(CachingEnphaseInterface,self)._execQuery(
                        system_id,'summary',kwargs)

                    summary.to_sql('summary',con.connection, if_exists='append')

        return summary 

def _CombineDateAndTime(date, time, tzinfo):
    """Creates a datetime object from date and time objects.

    This is similar to the datetime.combine method, but its timezone
    calculations are designed to work with pytz.

    Arguments:
      date: a datetime.date object, in any timezone
      time: a datetime.time object, in any timezone
      tzinfo: a pytz timezone object, or None

    Returns:
      a datetime.datetime object, in the timezone 'tzinfo'
    """
    naive_result = datetime.datetime(
        date.year, date.month, date.day, time.hour, time.minute, time.second)
    if tzinfo is None:
      return naive_result

    try:
      return tzinfo.localize(naive_result, is_dst=None)
    except AmbiguousTimeError:


      return min(tzinfo.localize(naive_result, is_dst=True),
                 tzinfo.localize(naive_result, is_dst=False))
    except NonExistentTimeError:




      while True:
        naive_result += datetime.timedelta(minutes=1)
        try:
          return tzinfo.localize(naive_result, is_dst=None)
        except NonExistentTimeError:
          pass 

def test_tz_aware_arithmetic(self):
        import random

        now = self.theclass.now()
        tz55 = FixedOffset(-330, "west 5:30")
        timeaware = now.time().replace(tzinfo=tz55)
        nowaware = self.theclass.combine(now.date(), timeaware)
        self.assertIs(nowaware.tzinfo, tz55)
        self.assertEqual(nowaware.timetz(), timeaware)

        # Can't mix aware and non-aware.
        self.assertRaises(TypeError, lambda: now - nowaware)
        self.assertRaises(TypeError, lambda: nowaware - now)

        # And adding datetime's doesn't make sense, aware or not.
        self.assertRaises(TypeError, lambda: now + nowaware)
        self.assertRaises(TypeError, lambda: nowaware + now)
        self.assertRaises(TypeError, lambda: nowaware + nowaware)

        # Subtracting should yield 0.
        self.assertEqual(now - now, timedelta(0))
        self.assertEqual(nowaware - nowaware, timedelta(0))

        # Adding a delta should preserve tzinfo.
        delta = timedelta(weeks=1, minutes=12, microseconds=5678)
        nowawareplus = nowaware + delta
        self.assertIs(nowaware.tzinfo, tz55)
        nowawareplus2 = delta + nowaware
        self.assertIs(nowawareplus2.tzinfo, tz55)
        self.assertEqual(nowawareplus, nowawareplus2)

        # that - delta should be what we started with, and that - what we
        # started with should be delta.
        diff = nowawareplus - delta
        self.assertIs(diff.tzinfo, tz55)
        self.assertEqual(nowaware, diff)
        self.assertRaises(TypeError, lambda: delta - nowawareplus)
        self.assertEqual(nowawareplus - nowaware, delta)

        # Make up a random timezone.
        tzr = FixedOffset(random.randrange(-1439, 1440), "randomtimezone")
        # Attach it to nowawareplus.
        nowawareplus = nowawareplus.replace(tzinfo=tzr)
        self.assertIs(nowawareplus.tzinfo, tzr)
        # Make sure the difference takes the timezone adjustments into account.
        got = nowaware - nowawareplus
        # Expected:  (nowaware base - nowaware offset) -
        #            (nowawareplus base - nowawareplus offset) =
        #            (nowaware base - nowawareplus base) +
        #            (nowawareplus offset - nowaware offset) =
        #            -delta + nowawareplus offset - nowaware offset
        expected = nowawareplus.utcoffset() - nowaware.utcoffset() - delta
        self.assertEqual(got, expected)

        # Try max possible difference.
        min = self.theclass(1, 1, 1, tzinfo=FixedOffset(1439, "min"))
        max = self.theclass(MAXYEAR, 12, 31, 23, 59, 59, 999999,
                            tzinfo=FixedOffset(-1439, "max"))
        maxdiff = max - min
        self.assertEqual(maxdiff, self.theclass.max - self.theclass.min +
                                  timedelta(minutes=2*1439)) 

def test_tz_aware_arithmetic(self):
        import random

        now = self.theclass.now()
        tz55 = FixedOffset(-330, "west 5:30")
        timeaware = now.time().replace(tzinfo=tz55)
        nowaware = self.theclass.combine(now.date(), timeaware)
        self.assertIs(nowaware.tzinfo, tz55)
        self.assertEqual(nowaware.timetz(), timeaware)

        # Can't mix aware and non-aware.
        self.assertRaises(TypeError, lambda: now - nowaware)
        self.assertRaises(TypeError, lambda: nowaware - now)

        # And adding datetime's doesn't make sense, aware or not.
        self.assertRaises(TypeError, lambda: now + nowaware)
        self.assertRaises(TypeError, lambda: nowaware + now)
        self.assertRaises(TypeError, lambda: nowaware + nowaware)

        # Subtracting should yield 0.
        self.assertEqual(now - now, timedelta(0))
        self.assertEqual(nowaware - nowaware, timedelta(0))

        # Adding a delta should preserve tzinfo.
        delta = timedelta(weeks=1, minutes=12, microseconds=5678)
        nowawareplus = nowaware + delta
        self.assertIs(nowaware.tzinfo, tz55)
        nowawareplus2 = delta + nowaware
        self.assertIs(nowawareplus2.tzinfo, tz55)
        self.assertEqual(nowawareplus, nowawareplus2)

        # that - delta should be what we started with, and that - what we
        # started with should be delta.
        diff = nowawareplus - delta
        self.assertIs(diff.tzinfo, tz55)
        self.assertEqual(nowaware, diff)
        self.assertRaises(TypeError, lambda: delta - nowawareplus)
        self.assertEqual(nowawareplus - nowaware, delta)

        # Make up a random timezone.
        tzr = FixedOffset(random.randrange(-1439, 1440), "randomtimezone")
        # Attach it to nowawareplus.
        nowawareplus = nowawareplus.replace(tzinfo=tzr)
        self.assertIs(nowawareplus.tzinfo, tzr)
        # Make sure the difference takes the timezone adjustments into account.
        got = nowaware - nowawareplus
        # Expected:  (nowaware base - nowaware offset) -
        #            (nowawareplus base - nowawareplus offset) =
        #            (nowaware base - nowawareplus base) +
        #            (nowawareplus offset - nowaware offset) =
        #            -delta + nowawareplus offset - nowaware offset
        expected = nowawareplus.utcoffset() - nowaware.utcoffset() - delta
        self.assertEqual(got, expected)

        # Try max possible difference.
        min = self.theclass(1, 1, 1, tzinfo=FixedOffset(1439, "min"))
        max = self.theclass(MAXYEAR, 12, 31, 23, 59, 59, 999999,
                            tzinfo=FixedOffset(-1439, "max"))
        maxdiff = max - min
        self.assertEqual(maxdiff, self.theclass.max - self.theclass.min +
                                  timedelta(minutes=2*1439)) 

def test_tz_aware_arithmetic(self):
        import random

        now = self.theclass.now()
        tz55 = FixedOffset(-330, "west 5:30")
        timeaware = now.time().replace(tzinfo=tz55)
        nowaware = self.theclass.combine(now.date(), timeaware)
        self.assertIs(nowaware.tzinfo, tz55)
        self.assertEqual(nowaware.timetz(), timeaware)

        # Can't mix aware and non-aware.
        self.assertRaises(TypeError, lambda: now - nowaware)
        self.assertRaises(TypeError, lambda: nowaware - now)

        # And adding datetime's doesn't make sense, aware or not.
        self.assertRaises(TypeError, lambda: now + nowaware)
        self.assertRaises(TypeError, lambda: nowaware + now)
        self.assertRaises(TypeError, lambda: nowaware + nowaware)

        # Subtracting should yield 0.
        self.assertEqual(now - now, timedelta(0))
        self.assertEqual(nowaware - nowaware, timedelta(0))

        # Adding a delta should preserve tzinfo.
        delta = timedelta(weeks=1, minutes=12, microseconds=5678)
        nowawareplus = nowaware + delta
        self.assertIs(nowaware.tzinfo, tz55)
        nowawareplus2 = delta + nowaware
        self.assertIs(nowawareplus2.tzinfo, tz55)
        self.assertEqual(nowawareplus, nowawareplus2)

        # that - delta should be what we started with, and that - what we
        # started with should be delta.
        diff = nowawareplus - delta
        self.assertIs(diff.tzinfo, tz55)
        self.assertEqual(nowaware, diff)
        self.assertRaises(TypeError, lambda: delta - nowawareplus)
        self.assertEqual(nowawareplus - nowaware, delta)

        # Make up a random timezone.
        tzr = FixedOffset(random.randrange(-1439, 1440), "randomtimezone")
        # Attach it to nowawareplus.
        nowawareplus = nowawareplus.replace(tzinfo=tzr)
        self.assertIs(nowawareplus.tzinfo, tzr)
        # Make sure the difference takes the timezone adjustments into account.
        got = nowaware - nowawareplus
        # Expected:  (nowaware base - nowaware offset) -
        #            (nowawareplus base - nowawareplus offset) =
        #            (nowaware base - nowawareplus base) +
        #            (nowawareplus offset - nowaware offset) =
        #            -delta + nowawareplus offset - nowaware offset
        expected = nowawareplus.utcoffset() - nowaware.utcoffset() - delta
        self.assertEqual(got, expected)

        # Try max possible difference.
        min = self.theclass(1, 1, 1, tzinfo=FixedOffset(1439, "min"))
        max = self.theclass(MAXYEAR, 12, 31, 23, 59, 59, 999999,
                            tzinfo=FixedOffset(-1439, "max"))
        maxdiff = max - min
        self.assertEqual(maxdiff, self.theclass.max - self.theclass.min +
                                  timedelta(minutes=2*1439)) 

def test_tz_aware_arithmetic(self):
        import random

        now = self.theclass.now()
        tz55 = FixedOffset(-330, "west 5:30")
        timeaware = now.time().replace(tzinfo=tz55)
        nowaware = self.theclass.combine(now.date(), timeaware)
        self.failUnless(nowaware.tzinfo is tz55)
        self.assertEqual(nowaware.timetz(), timeaware)

        # Can't mix aware and non-aware.
        self.assertRaises(TypeError, lambda: now - nowaware)
        self.assertRaises(TypeError, lambda: nowaware - now)

        # And adding datetime's doesn't make sense, aware or not.
        self.assertRaises(TypeError, lambda: now + nowaware)
        self.assertRaises(TypeError, lambda: nowaware + now)
        self.assertRaises(TypeError, lambda: nowaware + nowaware)

        # Subtracting should yield 0.
        self.assertEqual(now - now, timedelta(0))
        self.assertEqual(nowaware - nowaware, timedelta(0))

        # Adding a delta should preserve tzinfo.
        delta = timedelta(weeks=1, minutes=12, microseconds=5678)
        nowawareplus = nowaware + delta
        self.failUnless(nowaware.tzinfo is tz55)
        nowawareplus2 = delta + nowaware
        self.failUnless(nowawareplus2.tzinfo is tz55)
        self.assertEqual(nowawareplus, nowawareplus2)

        # that - delta should be what we started with, and that - what we
        # started with should be delta.
        diff = nowawareplus - delta
        self.failUnless(diff.tzinfo is tz55)
        self.assertEqual(nowaware, diff)
        self.assertRaises(TypeError, lambda: delta - nowawareplus)
        self.assertEqual(nowawareplus - nowaware, delta)

        # Make up a random timezone.
        tzr = FixedOffset(random.randrange(-1439, 1440), "randomtimezone")
        # Attach it to nowawareplus.
        nowawareplus = nowawareplus.replace(tzinfo=tzr)
        self.failUnless(nowawareplus.tzinfo is tzr)
        # Make sure the difference takes the timezone adjustments into account.
        got = nowaware - nowawareplus
        # Expected:  (nowaware base - nowaware offset) -
        #            (nowawareplus base - nowawareplus offset) =
        #            (nowaware base - nowawareplus base) +
        #            (nowawareplus offset - nowaware offset) =
        #            -delta + nowawareplus offset - nowaware offset
        expected = nowawareplus.utcoffset() - nowaware.utcoffset() - delta
        self.assertEqual(got, expected)

        # Try max possible difference.
        min = self.theclass(1, 1, 1, tzinfo=FixedOffset(1439, "min"))
        max = self.theclass(MAXYEAR, 12, 31, 23, 59, 59, 999999,
                            tzinfo=FixedOffset(-1439, "max"))
        maxdiff = max - min
        self.assertEqual(maxdiff, self.theclass.max - self.theclass.min +
                                  timedelta(minutes=2*1439))