Python源码示例:datetime.MAXYEAR

示例1
def itermonthdates(self, year, month):
        """
        Return an iterator for one month. The iterator will yield datetime.date
        values and will always iterate through complete weeks, so it will yield
        dates outside the specified month.
        """
        date = datetime.date(year, month, 1)
        # Go back to the beginning of the week
        days = (date.weekday() - self.firstweekday) % 7
        date -= datetime.timedelta(days=days)
        oneday = datetime.timedelta(days=1)
        while True:
            yield date
            try:
                date += oneday
            except OverflowError:
                # Adding one day could fail after datetime.MAXYEAR
                break
            if date.month != month and date.weekday() == self.firstweekday:
                break 
示例2
def test_bad_constructor_arguments(self):
        # bad years
        self.theclass(MINYEAR, 1, 1)  # no exception
        self.theclass(MAXYEAR, 1, 1)  # no exception
        self.assertRaises(ValueError, self.theclass, MINYEAR-1, 1, 1)
        self.assertRaises(ValueError, self.theclass, MAXYEAR+1, 1, 1)
        # bad months
        self.theclass(2000, 1, 1)    # no exception
        self.theclass(2000, 12, 1)   # no exception
        self.assertRaises(ValueError, self.theclass, 2000, 0, 1)
        self.assertRaises(ValueError, self.theclass, 2000, 13, 1)
        # bad days
        self.theclass(2000, 2, 29)   # no exception
        self.theclass(2004, 2, 29)   # no exception
        self.theclass(2400, 2, 29)   # no exception
        self.assertRaises(ValueError, self.theclass, 2000, 2, 30)
        self.assertRaises(ValueError, self.theclass, 2001, 2, 29)
        self.assertRaises(ValueError, self.theclass, 2100, 2, 29)
        self.assertRaises(ValueError, self.theclass, 1900, 2, 29)
        self.assertRaises(ValueError, self.theclass, 2000, 1, 0)
        self.assertRaises(ValueError, self.theclass, 2000, 1, 32) 
示例3
def test_tz_independent_comparing(self):
        dt1 = self.theclass(2002, 3, 1, 9, 0, 0)
        dt2 = self.theclass(2002, 3, 1, 10, 0, 0)
        dt3 = self.theclass(2002, 3, 1, 9, 0, 0)
        self.assertEqual(dt1, dt3)
        self.assertTrue(dt2 > dt3)

        # Make sure comparison doesn't forget microseconds, and isn't done
        # via comparing a float timestamp (an IEEE double doesn't have enough
        # precision to span microsecond resolution across years 1 thru 9999,
        # so comparing via timestamp necessarily calls some distinct values
        # equal).
        dt1 = self.theclass(MAXYEAR, 12, 31, 23, 59, 59, 999998)
        us = timedelta(microseconds=1)
        dt2 = dt1 + us
        self.assertEqual(dt2 - dt1, us)
        self.assertTrue(dt1 < dt2) 
示例4
def itermonthdates(self, year, month):
        """
        Return an iterator for one month. The iterator will yield datetime.date
        values and will always iterate through complete weeks, so it will yield
        dates outside the specified month.
        """
        date = datetime.date(year, month, 1)
        # Go back to the beginning of the week
        days = (date.weekday() - self.firstweekday) % 7
        date -= datetime.timedelta(days=days)
        oneday = datetime.timedelta(days=1)
        while True:
            yield date
            try:
                date += oneday
            except OverflowError:
                # Adding one day could fail after datetime.MAXYEAR
                break
            if date.month != month and date.weekday() == self.firstweekday:
                break 
示例5
def timestampWin64(value):
    """
    Convert Windows 64-bit timestamp to string. The timestamp format is
    a 64-bit number which represents number of 100ns since the
    1st January 1601 at 00:00. Result is an unicode string.
    See also durationWin64(). Maximum date is 28 may 60056.

    >>> timestampWin64(0)
    datetime.datetime(1601, 1, 1, 0, 0)
    >>> timestampWin64(127840491566710000)
    datetime.datetime(2006, 2, 10, 12, 45, 56, 671000)
    """
    try:
        return WIN64_TIMESTAMP_T0 + durationWin64(value)
    except OverflowError:
        raise ValueError(_("date newer than year %s (value=%s)") % (MAXYEAR, value))

# Start of 60-bit UUID timestamp: 15 October 1582 at 00:00 
示例6
def timestampWin64(value):
    """
    Convert Windows 64-bit timestamp to string. The timestamp format is
    a 64-bit number which represents number of 100ns since the
    1st January 1601 at 00:00. Result is an unicode string.
    See also durationWin64(). Maximum date is 28 may 60056.

    >>> timestampWin64(0)
    datetime.datetime(1601, 1, 1, 0, 0)
    >>> timestampWin64(127840491566710000)
    datetime.datetime(2006, 2, 10, 12, 45, 56, 671000)
    """
    try:
        return WIN64_TIMESTAMP_T0 + durationWin64(value)
    except OverflowError:
        raise ValueError(_("date newer than year %s (value=%s)") % (MAXYEAR, value))

# Start of 60-bit UUID timestamp: 15 October 1582 at 00:00 
示例7
def test_bad_constructor_arguments(self):
        # bad years
        self.theclass(MINYEAR, 1, 1)  # no exception
        self.theclass(MAXYEAR, 1, 1)  # no exception
        self.assertRaises(ValueError, self.theclass, MINYEAR-1, 1, 1)
        self.assertRaises(ValueError, self.theclass, MAXYEAR+1, 1, 1)
        # bad months
        self.theclass(2000, 1, 1)    # no exception
        self.theclass(2000, 12, 1)   # no exception
        self.assertRaises(ValueError, self.theclass, 2000, 0, 1)
        self.assertRaises(ValueError, self.theclass, 2000, 13, 1)
        # bad days
        self.theclass(2000, 2, 29)   # no exception
        self.theclass(2004, 2, 29)   # no exception
        self.theclass(2400, 2, 29)   # no exception
        self.assertRaises(ValueError, self.theclass, 2000, 2, 30)
        self.assertRaises(ValueError, self.theclass, 2001, 2, 29)
        self.assertRaises(ValueError, self.theclass, 2100, 2, 29)
        self.assertRaises(ValueError, self.theclass, 1900, 2, 29)
        self.assertRaises(ValueError, self.theclass, 2000, 1, 0)
        self.assertRaises(ValueError, self.theclass, 2000, 1, 32) 
示例8
def test_tz_independent_comparing(self):
        dt1 = self.theclass(2002, 3, 1, 9, 0, 0)
        dt2 = self.theclass(2002, 3, 1, 10, 0, 0)
        dt3 = self.theclass(2002, 3, 1, 9, 0, 0)
        self.assertEqual(dt1, dt3)
        self.assertTrue(dt2 > dt3)

        # Make sure comparison doesn't forget microseconds, and isn't done
        # via comparing a float timestamp (an IEEE double doesn't have enough
        # precision to span microsecond resolution across years 1 thru 9999,
        # so comparing via timestamp necessarily calls some distinct values
        # equal).
        dt1 = self.theclass(MAXYEAR, 12, 31, 23, 59, 59, 999998)
        us = timedelta(microseconds=1)
        dt2 = dt1 + us
        self.assertEqual(dt2 - dt1, us)
        self.assertTrue(dt1 < dt2) 
示例9
def itermonthdates(self, year, month):
        """
        Return an iterator for one month. The iterator will yield datetime.date
        values and will always iterate through complete weeks, so it will yield
        dates outside the specified month.
        """
        date = datetime.date(year, month, 1)
        # Go back to the beginning of the week
        days = (date.weekday() - self.firstweekday) % 7
        date -= datetime.timedelta(days=days)
        oneday = datetime.timedelta(days=1)
        while True:
            yield date
            try:
                date += oneday
            except OverflowError:
                # Adding one day could fail after datetime.MAXYEAR
                break
            if date.month != month and date.weekday() == self.firstweekday:
                break 
示例10
def test_bad_constructor_arguments(self):
        # bad years
        self.theclass(MINYEAR, 1, 1)  # no exception
        self.theclass(MAXYEAR, 1, 1)  # no exception
        self.assertRaises(ValueError, self.theclass, MINYEAR-1, 1, 1)
        self.assertRaises(ValueError, self.theclass, MAXYEAR+1, 1, 1)
        # bad months
        self.theclass(2000, 1, 1)    # no exception
        self.theclass(2000, 12, 1)   # no exception
        self.assertRaises(ValueError, self.theclass, 2000, 0, 1)
        self.assertRaises(ValueError, self.theclass, 2000, 13, 1)
        # bad days
        self.theclass(2000, 2, 29)   # no exception
        self.theclass(2004, 2, 29)   # no exception
        self.theclass(2400, 2, 29)   # no exception
        self.assertRaises(ValueError, self.theclass, 2000, 2, 30)
        self.assertRaises(ValueError, self.theclass, 2001, 2, 29)
        self.assertRaises(ValueError, self.theclass, 2100, 2, 29)
        self.assertRaises(ValueError, self.theclass, 1900, 2, 29)
        self.assertRaises(ValueError, self.theclass, 2000, 1, 0)
        self.assertRaises(ValueError, self.theclass, 2000, 1, 32) 
示例11
def test_tz_independent_comparing(self):
        dt1 = self.theclass(2002, 3, 1, 9, 0, 0)
        dt2 = self.theclass(2002, 3, 1, 10, 0, 0)
        dt3 = self.theclass(2002, 3, 1, 9, 0, 0)
        self.assertEqual(dt1, dt3)
        self.assertTrue(dt2 > dt3)

        # Make sure comparison doesn't forget microseconds, and isn't done
        # via comparing a float timestamp (an IEEE double doesn't have enough
        # precision to span microsecond resolution across years 1 thru 9999,
        # so comparing via timestamp necessarily calls some distinct values
        # equal).
        dt1 = self.theclass(MAXYEAR, 12, 31, 23, 59, 59, 999998)
        us = timedelta(microseconds=1)
        dt2 = dt1 + us
        self.assertEqual(dt2 - dt1, us)
        self.assertTrue(dt1 < dt2) 
示例12
def itermonthdates(self, year, month):
        """
        Return an iterator for one month. The iterator will yield datetime.date
        values and will always iterate through complete weeks, so it will yield
        dates outside the specified month.
        """
        date = datetime.date(year, month, 1)
        # Go back to the beginning of the week
        days = (date.weekday() - self.firstweekday) % 7
        date -= datetime.timedelta(days=days)
        oneday = datetime.timedelta(days=1)
        while True:
            yield date
            try:
                date += oneday
            except OverflowError:
                # Adding one day could fail after datetime.MAXYEAR
                break
            if date.month != month and date.weekday() == self.firstweekday:
                break 
示例13
def test_bad_constructor_arguments(self):
        # bad years
        self.theclass(MINYEAR, 1, 1)  # no exception
        self.theclass(MAXYEAR, 1, 1)  # no exception
        self.assertRaises(ValueError, self.theclass, MINYEAR-1, 1, 1)
        self.assertRaises(ValueError, self.theclass, MAXYEAR+1, 1, 1)
        # bad months
        self.theclass(2000, 1, 1)    # no exception
        self.theclass(2000, 12, 1)   # no exception
        self.assertRaises(ValueError, self.theclass, 2000, 0, 1)
        self.assertRaises(ValueError, self.theclass, 2000, 13, 1)
        # bad days
        self.theclass(2000, 2, 29)   # no exception
        self.theclass(2004, 2, 29)   # no exception
        self.theclass(2400, 2, 29)   # no exception
        self.assertRaises(ValueError, self.theclass, 2000, 2, 30)
        self.assertRaises(ValueError, self.theclass, 2001, 2, 29)
        self.assertRaises(ValueError, self.theclass, 2100, 2, 29)
        self.assertRaises(ValueError, self.theclass, 1900, 2, 29)
        self.assertRaises(ValueError, self.theclass, 2000, 1, 0)
        self.assertRaises(ValueError, self.theclass, 2000, 1, 32) 
示例14
def itermonthdates(self, year, month):
        """
        Return an iterator for one month. The iterator will yield datetime.date
        values and will always iterate through complete weeks, so it will yield
        dates outside the specified month.
        """
        date = datetime.date(year, month, 1)
        # Go back to the beginning of the week
        days = (date.weekday() - self.firstweekday) % 7
        date -= datetime.timedelta(days=days)
        oneday = datetime.timedelta(days=1)
        while True:
            yield date
            try:
                date += oneday
            except OverflowError:
                # Adding one day could fail after datetime.MAXYEAR
                break
            if date.month != month and date.weekday() == self.firstweekday:
                break 
示例15
def test_bad_constructor_arguments(self):
        # bad years
        self.theclass(MINYEAR, 1, 1)  # no exception
        self.theclass(MAXYEAR, 1, 1)  # no exception
        self.assertRaises(ValueError, self.theclass, MINYEAR-1, 1, 1)
        self.assertRaises(ValueError, self.theclass, MAXYEAR+1, 1, 1)
        # bad months
        self.theclass(2000, 1, 1)    # no exception
        self.theclass(2000, 12, 1)   # no exception
        self.assertRaises(ValueError, self.theclass, 2000, 0, 1)
        self.assertRaises(ValueError, self.theclass, 2000, 13, 1)
        # bad days
        self.theclass(2000, 2, 29)   # no exception
        self.theclass(2004, 2, 29)   # no exception
        self.theclass(2400, 2, 29)   # no exception
        self.assertRaises(ValueError, self.theclass, 2000, 2, 30)
        self.assertRaises(ValueError, self.theclass, 2001, 2, 29)
        self.assertRaises(ValueError, self.theclass, 2100, 2, 29)
        self.assertRaises(ValueError, self.theclass, 1900, 2, 29)
        self.assertRaises(ValueError, self.theclass, 2000, 1, 0)
        self.assertRaises(ValueError, self.theclass, 2000, 1, 32) 
示例16
def test_tz_independent_comparing(self):
        dt1 = self.theclass(2002, 3, 1, 9, 0, 0)
        dt2 = self.theclass(2002, 3, 1, 10, 0, 0)
        dt3 = self.theclass(2002, 3, 1, 9, 0, 0)
        self.assertEqual(dt1, dt3)
        self.assertTrue(dt2 > dt3)

        # Make sure comparison doesn't forget microseconds, and isn't done
        # via comparing a float timestamp (an IEEE double doesn't have enough
        # precision to span microsecond resolution across years 1 thru 9999,
        # so comparing via timestamp necessarily calls some distinct values
        # equal).
        dt1 = self.theclass(MAXYEAR, 12, 31, 23, 59, 59, 999998)
        us = timedelta(microseconds=1)
        dt2 = dt1 + us
        self.assertEqual(dt2 - dt1, us)
        self.assertTrue(dt1 < dt2) 
示例17
def itermonthdates(self, year, month):
        """
        Return an iterator for one month. The iterator will yield datetime.date
        values and will always iterate through complete weeks, so it will yield
        dates outside the specified month.
        """
        date = datetime.date(year, month, 1)
        # Go back to the beginning of the week
        days = (date.weekday() - self.firstweekday) % 7
        date -= datetime.timedelta(days=days)
        oneday = datetime.timedelta(days=1)
        while True:
            yield date
            try:
                date += oneday
            except OverflowError:
                # Adding one day could fail after datetime.MAXYEAR
                break
            if date.month != month and date.weekday() == self.firstweekday:
                break 
示例18
def _check_year(year):
    """Check if year is a valid year.

    :param year: The year to test
    :return: The year
    :rtype: int
    :raises TypeError: If year is not an int or int-like string
    :raises ValueError: If year is out of range
    """
    year = _check_int(year)

    if datetime.MINYEAR <= year <= datetime.MAXYEAR:
        return year
    else:
        raise ValueError('year must be in %d..%d' % (
            datetime.MINYEAR, datetime.MAXYEAR), year) 
示例19
def test_constants(self):
        import datetime
        self.assertEqual(datetime.MINYEAR, 1)
        self.assertEqual(datetime.MAXYEAR, 9999)

#############################################################################
# tzinfo tests 
示例20
def test_bad_constructor_arguments(self):
        # bad years
        self.theclass(MINYEAR, 1, 1)  # no exception
        self.theclass(MAXYEAR, 1, 1)  # no exception
        self.assertRaises(ValueError, self.theclass, MINYEAR-1, 1, 1)
        self.assertRaises(ValueError, self.theclass, MAXYEAR+1, 1, 1)
        # bad months
        self.theclass(2000, 1, 1)    # no exception
        self.theclass(2000, 12, 1)   # no exception
        self.assertRaises(ValueError, self.theclass, 2000, 0, 1)
        self.assertRaises(ValueError, self.theclass, 2000, 13, 1)
        # bad days
        self.theclass(2000, 2, 29)   # no exception
        self.theclass(2004, 2, 29)   # no exception
        self.theclass(2400, 2, 29)   # no exception
        self.assertRaises(ValueError, self.theclass, 2000, 2, 30)
        self.assertRaises(ValueError, self.theclass, 2001, 2, 29)
        self.assertRaises(ValueError, self.theclass, 2100, 2, 29)
        self.assertRaises(ValueError, self.theclass, 1900, 2, 29)
        self.assertRaises(ValueError, self.theclass, 2000, 1, 0)
        self.assertRaises(ValueError, self.theclass, 2000, 1, 32) 
示例21
def test_tz_independent_comparing(self):
        dt1 = self.theclass(2002, 3, 1, 9, 0, 0)
        dt2 = self.theclass(2002, 3, 1, 10, 0, 0)
        dt3 = self.theclass(2002, 3, 1, 9, 0, 0)
        self.assertEqual(dt1, dt3)
        self.assertTrue(dt2 > dt3)

        # Make sure comparison doesn't forget microseconds, and isn't done
        # via comparing a float timestamp (an IEEE double doesn't have enough
        # precision to span microsecond resolution across years 1 thru 9999,
        # so comparing via timestamp necessarily calls some distinct values
        # equal).
        dt1 = self.theclass(MAXYEAR, 12, 31, 23, 59, 59, 999998)
        us = timedelta(microseconds=1)
        dt2 = dt1 + us
        self.assertEqual(dt2 - dt1, us)
        self.assertTrue(dt1 < dt2) 
示例22
def itermonthdates(self, year, month):
        """
        Return an iterator for one month. The iterator will yield datetime.date
        values and will always iterate through complete weeks, so it will yield
        dates outside the specified month.
        """
        date = datetime.date(year, month, 1)
        # Go back to the beginning of the week
        days = (date.weekday() - self.firstweekday) % 7
        date -= datetime.timedelta(days=days)
        oneday = datetime.timedelta(days=1)
        while True:
            yield date
            try:
                date += oneday
            except OverflowError:
                # Adding one day could fail after datetime.MAXYEAR
                break
            if date.month != month and date.weekday() == self.firstweekday:
                break 
示例23
def test_constants(self):
        datetime = datetime_module
        self.assertEqual(datetime.MINYEAR, 1)
        self.assertEqual(datetime.MAXYEAR, 9999) 
示例24
def test_tz_independent_comparing(self):
        dt1 = self.theclass(2002, 3, 1, 9, 0, 0)
        dt2 = self.theclass(2002, 3, 1, 10, 0, 0)
        dt3 = self.theclass(2002, 3, 1, 9, 0, 0)
        self.assertEqual(dt1, dt3)
        self.assertTrue(dt2 > dt3)

        # Make sure comparison doesn't forget microseconds, and isn't done
        # via comparing a float timestamp (an IEEE double doesn't have enough
        # precision to span microsecond resolution across years 1 thru 9999,
        # so comparing via timestamp necessarily calls some distinct values
        # equal).
        dt1 = self.theclass(MAXYEAR, 12, 31, 23, 59, 59, 999998)
        us = timedelta(microseconds=1)
        dt2 = dt1 + us
        self.assertEqual(dt2 - dt1, us)
        self.assertTrue(dt1 < dt2) 
示例25
def itermonthdates(self, year, month):
        """
        Return an iterator for one month. The iterator will yield datetime.date
        values and will always iterate through complete weeks, so it will yield
        dates outside the specified month.
        """
        date = datetime.date(year, month, 1)
        # Go back to the beginning of the week
        days = (date.weekday() - self.firstweekday) % 7
        date -= datetime.timedelta(days=days)
        oneday = datetime.timedelta(days=1)
        while True:
            yield date
            try:
                date += oneday
            except OverflowError:
                # Adding one day could fail after datetime.MAXYEAR
                break
            if date.month != month and date.weekday() == self.firstweekday:
                break 
示例26
def test_bad_constructor_arguments(self):
        # bad years
        self.theclass(MINYEAR, 1, 1)  # no exception
        self.theclass(MAXYEAR, 1, 1)  # no exception
        self.assertRaises(ValueError, self.theclass, MINYEAR-1, 1, 1)
        self.assertRaises(ValueError, self.theclass, MAXYEAR+1, 1, 1)
        # bad months
        self.theclass(2000, 1, 1)    # no exception
        self.theclass(2000, 12, 1)   # no exception
        self.assertRaises(ValueError, self.theclass, 2000, 0, 1)
        self.assertRaises(ValueError, self.theclass, 2000, 13, 1)
        # bad days
        self.theclass(2000, 2, 29)   # no exception
        self.theclass(2004, 2, 29)   # no exception
        self.theclass(2400, 2, 29)   # no exception
        self.assertRaises(ValueError, self.theclass, 2000, 2, 30)
        self.assertRaises(ValueError, self.theclass, 2001, 2, 29)
        self.assertRaises(ValueError, self.theclass, 2100, 2, 29)
        self.assertRaises(ValueError, self.theclass, 1900, 2, 29)
        self.assertRaises(ValueError, self.theclass, 2000, 1, 0)
        self.assertRaises(ValueError, self.theclass, 2000, 1, 32) 
示例27
def test_tz_independent_comparing(self):
        dt1 = self.theclass(2002, 3, 1, 9, 0, 0)
        dt2 = self.theclass(2002, 3, 1, 10, 0, 0)
        dt3 = self.theclass(2002, 3, 1, 9, 0, 0)
        self.assertEqual(dt1, dt3)
        self.assert_(dt2 > dt3)

        # Make sure comparison doesn't forget microseconds, and isn't done
        # via comparing a float timestamp (an IEEE double doesn't have enough
        # precision to span microsecond resolution across years 1 thru 9999,
        # so comparing via timestamp necessarily calls some distinct values
        # equal).
        dt1 = self.theclass(MAXYEAR, 12, 31, 23, 59, 59, 999998)
        us = timedelta(microseconds=1)
        dt2 = dt1 + us
        self.assertEqual(dt2 - dt1, us)
        self.assert_(dt1 < dt2) 
示例28
def itermonthdates(self, year, month):
        """
        Return an iterator for one month. The iterator will yield datetime.date
        values and will always iterate through complete weeks, so it will yield
        dates outside the specified month.
        """
        date = datetime.date(year, month, 1)
        # Go back to the beginning of the week
        days = (date.weekday() - self.firstweekday) % 7
        date -= datetime.timedelta(days=days)
        oneday = datetime.timedelta(days=1)
        while True:
            yield date
            try:
                date += oneday
            except OverflowError:
                # Adding one day could fail after datetime.MAXYEAR
                break
            if date.month != month and date.weekday() == self.firstweekday:
                break 
示例29
def test_bad_constructor_arguments(self):
        # bad years
        self.theclass(MINYEAR, 1, 1)  # no exception
        self.theclass(MAXYEAR, 1, 1)  # no exception
        self.assertRaises(ValueError, self.theclass, MINYEAR-1, 1, 1)
        self.assertRaises(ValueError, self.theclass, MAXYEAR+1, 1, 1)
        # bad months
        self.theclass(2000, 1, 1)    # no exception
        self.theclass(2000, 12, 1)   # no exception
        self.assertRaises(ValueError, self.theclass, 2000, 0, 1)
        self.assertRaises(ValueError, self.theclass, 2000, 13, 1)
        # bad days
        self.theclass(2000, 2, 29)   # no exception
        self.theclass(2004, 2, 29)   # no exception
        self.theclass(2400, 2, 29)   # no exception
        self.assertRaises(ValueError, self.theclass, 2000, 2, 30)
        self.assertRaises(ValueError, self.theclass, 2001, 2, 29)
        self.assertRaises(ValueError, self.theclass, 2100, 2, 29)
        self.assertRaises(ValueError, self.theclass, 1900, 2, 29)
        self.assertRaises(ValueError, self.theclass, 2000, 1, 0)
        self.assertRaises(ValueError, self.theclass, 2000, 1, 32) 
示例30
def test_tz_independent_comparing(self):
        dt1 = self.theclass(2002, 3, 1, 9, 0, 0)
        dt2 = self.theclass(2002, 3, 1, 10, 0, 0)
        dt3 = self.theclass(2002, 3, 1, 9, 0, 0)
        self.assertEqual(dt1, dt3)
        self.assertTrue(dt2 > dt3)

        # Make sure comparison doesn't forget microseconds, and isn't done
        # via comparing a float timestamp (an IEEE double doesn't have enough
        # precision to span microsecond resolution across years 1 thru 9999,
        # so comparing via timestamp necessarily calls some distinct values
        # equal).
        dt1 = self.theclass(MAXYEAR, 12, 31, 23, 59, 59, 999998)
        us = timedelta(microseconds=1)
        dt2 = dt1 + us
        self.assertEqual(dt2 - dt1, us)
        self.assertTrue(dt1 < dt2)