def test_pickling_subclass(self):
# Make sure we can pickle/unpickle an instance of a subclass.
offset = timedelta(minutes=-300)
for otype, args in [
(PicklableFixedOffset, (offset, 'cookie')),
(timezone, (offset,)),
(timezone, (offset, "EST"))]:
orig = otype(*args)
oname = orig.tzname(None)
self.assertIsInstance(orig, tzinfo)
self.assertIs(type(orig), otype)
self.assertEqual(orig.utcoffset(None), offset)
self.assertEqual(orig.tzname(None), oname)
for pickler, unpickler, proto in pickle_choices:
green = pickler.dumps(orig, proto)
derived = unpickler.loads(green)
self.assertIsInstance(derived, tzinfo)
self.assertIs(type(derived), otype)
self.assertEqual(derived.utcoffset(None), offset)
self.assertEqual(derived.tzname(None), oname)
python类utcoffset()的实例源码
def test_astimezone(self):
# Pretty boring! The TZ test is more interesting here. astimezone()
# simply can't be applied to a naive object.
dt = self.theclass.now()
f = FixedOffset(44, "")
self.assertRaises(TypeError, dt.astimezone) # not enough args
self.assertRaises(TypeError, dt.astimezone, f, f) # too many args
self.assertRaises(TypeError, dt.astimezone, dt) # arg wrong type
self.assertRaises(ValueError, dt.astimezone, f) # naive
self.assertRaises(ValueError, dt.astimezone, tz=f) # naive
class Bogus(tzinfo):
def utcoffset(self, dt): return None
def dst(self, dt): return timedelta(0)
bog = Bogus()
self.assertRaises(ValueError, dt.astimezone, bog) # naive
self.assertRaises(ValueError,
dt.replace(tzinfo=bog).astimezone, f)
class AlsoBogus(tzinfo):
def utcoffset(self, dt): return timedelta(0)
def dst(self, dt): return None
alsobog = AlsoBogus()
self.assertRaises(ValueError, dt.astimezone, alsobog) # also naive
def test_pickling(self):
# Try one without a tzinfo.
args = 20, 59, 16, 64**2
orig = self.theclass(*args)
for pickler, unpickler, proto in pickle_choices:
green = pickler.dumps(orig, proto)
derived = unpickler.loads(green)
self.assertEqual(orig, derived)
# Try one with a tzinfo.
tinfo = PicklableFixedOffset(-300, 'cookie')
orig = self.theclass(5, 6, 7, tzinfo=tinfo)
for pickler, unpickler, proto in pickle_choices:
green = pickler.dumps(orig, proto)
derived = unpickler.loads(green)
self.assertEqual(orig, derived)
self.assertIsInstance(derived.tzinfo, PicklableFixedOffset)
self.assertEqual(derived.utcoffset(), timedelta(minutes=-300))
self.assertEqual(derived.tzname(), 'cookie')
def test_pickling(self):
# Try one without a tzinfo.
args = 6, 7, 23, 20, 59, 1, 64**2
orig = self.theclass(*args)
for pickler, unpickler, proto in pickle_choices:
green = pickler.dumps(orig, proto)
derived = unpickler.loads(green)
self.assertEqual(orig, derived)
# Try one with a tzinfo.
tinfo = PicklableFixedOffset(-300, 'cookie')
orig = self.theclass(*args, **{'tzinfo': tinfo})
derived = self.theclass(1, 1, 1, tzinfo=FixedOffset(0, "", 0))
for pickler, unpickler, proto in pickle_choices:
green = pickler.dumps(orig, proto)
derived = unpickler.loads(green)
self.assertEqual(orig, derived)
self.assertIsInstance(derived.tzinfo, PicklableFixedOffset)
self.assertEqual(derived.utcoffset(), timedelta(minutes=-300))
self.assertEqual(derived.tzname(), 'cookie')
def test_pickling_subclass(self):
# Make sure we can pickle/unpickle an instance of a subclass.
offset = timedelta(minutes=-300)
orig = PicklableFixedOffset(offset, 'cookie')
self.assertIsInstance(orig, tzinfo)
self.assertTrue(type(orig) is PicklableFixedOffset)
self.assertEqual(orig.utcoffset(None), offset)
self.assertEqual(orig.tzname(None), 'cookie')
for pickler, unpickler, proto in pickle_choices:
green = pickler.dumps(orig, proto)
derived = unpickler.loads(green)
self.assertIsInstance(derived, tzinfo)
self.assertTrue(type(derived) is PicklableFixedOffset)
self.assertEqual(derived.utcoffset(None), offset)
self.assertEqual(derived.tzname(None), 'cookie')
#############################################################################
# Base class for testing a particular aspect of timedelta, time, date and
# datetime comparisons.
def test_argument_passing(self):
cls = self.theclass
# A datetime passes itself on, a time passes None.
class introspective(tzinfo):
def tzname(self, dt): return dt and "real" or "none"
def utcoffset(self, dt):
return timedelta(minutes = dt and 42 or -42)
dst = utcoffset
obj = cls(1, 2, 3, tzinfo=introspective())
expected = cls is time and "none" or "real"
self.assertEqual(obj.tzname(), expected)
expected = timedelta(minutes=(cls is time and -42 or 42))
self.assertEqual(obj.utcoffset(), expected)
self.assertEqual(obj.dst(), expected)
def test_pickling(self):
# Try one without a tzinfo.
args = 6, 7, 23, 20, 59, 1, 64**2
orig = self.theclass(*args)
for pickler, unpickler, proto in pickle_choices:
green = pickler.dumps(orig, proto)
derived = unpickler.loads(green)
self.assertEqual(orig, derived)
# Try one with a tzinfo.
tinfo = PicklableFixedOffset(-300, 'cookie')
orig = self.theclass(*args, **{'tzinfo': tinfo})
derived = self.theclass(1, 1, 1, tzinfo=FixedOffset(0, "", 0))
for pickler, unpickler, proto in pickle_choices:
green = pickler.dumps(orig, proto)
derived = unpickler.loads(green)
self.assertEqual(orig, derived)
self.assertIsInstance(derived.tzinfo, PicklableFixedOffset)
self.assertEqual(derived.utcoffset(), timedelta(minutes=-300))
self.assertEqual(derived.tzname(), 'cookie')
def test_pickling_subclass(self):
# Make sure we can pickle/unpickle an instance of a subclass.
offset = timedelta(minutes=-300)
orig = PicklableFixedOffset(offset, 'cookie')
self.assertIsInstance(orig, tzinfo)
self.assertTrue(type(orig) is PicklableFixedOffset)
self.assertEqual(orig.utcoffset(None), offset)
self.assertEqual(orig.tzname(None), 'cookie')
for pickler, unpickler, proto in pickle_choices:
green = pickler.dumps(orig, proto)
derived = unpickler.loads(green)
self.assertIsInstance(derived, tzinfo)
self.assertTrue(type(derived) is PicklableFixedOffset)
self.assertEqual(derived.utcoffset(None), offset)
self.assertEqual(derived.tzname(None), 'cookie')
#############################################################################
# Base class for testing a particular aspect of timedelta, time, date and
# datetime comparisons.
def test_argument_passing(self):
cls = self.theclass
# A datetime passes itself on, a time passes None.
class introspective(tzinfo):
def tzname(self, dt): return dt and "real" or "none"
def utcoffset(self, dt):
return timedelta(minutes = dt and 42 or -42)
dst = utcoffset
obj = cls(1, 2, 3, tzinfo=introspective())
expected = cls is time and "none" or "real"
self.assertEqual(obj.tzname(), expected)
expected = timedelta(minutes=(cls is time and -42 or 42))
self.assertEqual(obj.utcoffset(), expected)
self.assertEqual(obj.dst(), expected)
def test_pickling(self):
# Try one without a tzinfo.
args = 6, 7, 23, 20, 59, 1, 64**2
orig = self.theclass(*args)
for pickler, unpickler, proto in pickle_choices:
green = pickler.dumps(orig, proto)
derived = unpickler.loads(green)
self.assertEqual(orig, derived)
# Try one with a tzinfo.
tinfo = PicklableFixedOffset(-300, 'cookie')
orig = self.theclass(*args, **{'tzinfo': tinfo})
derived = self.theclass(1, 1, 1, tzinfo=FixedOffset(0, "", 0))
for pickler, unpickler, proto in pickle_choices:
green = pickler.dumps(orig, proto)
derived = unpickler.loads(green)
self.assertEqual(orig, derived)
self.assertIsInstance(derived.tzinfo, PicklableFixedOffset)
self.assertEqual(derived.utcoffset(), timedelta(minutes=-300))
self.assertEqual(derived.tzname(), 'cookie')
def test_pickling_subclass(self):
# Make sure we can pickle/unpickle an instance of a subclass.
offset = timedelta(minutes=-300)
for otype, args in [
(PicklableFixedOffset, (offset, 'cookie')),
(timezone, (offset,)),
(timezone, (offset, "EST"))]:
orig = otype(*args)
oname = orig.tzname(None)
self.assertIsInstance(orig, tzinfo)
self.assertIs(type(orig), otype)
self.assertEqual(orig.utcoffset(None), offset)
self.assertEqual(orig.tzname(None), oname)
for pickler, unpickler, proto in pickle_choices:
green = pickler.dumps(orig, proto)
derived = unpickler.loads(green)
self.assertIsInstance(derived, tzinfo)
self.assertIs(type(derived), otype)
self.assertEqual(derived.utcoffset(None), offset)
self.assertEqual(derived.tzname(None), oname)
def test_astimezone(self):
# Pretty boring! The TZ test is more interesting here. astimezone()
# simply can't be applied to a naive object.
dt = self.theclass.now()
f = FixedOffset(44, "")
self.assertRaises(ValueError, dt.astimezone) # naive
self.assertRaises(TypeError, dt.astimezone, f, f) # too many args
self.assertRaises(TypeError, dt.astimezone, dt) # arg wrong type
self.assertRaises(ValueError, dt.astimezone, f) # naive
self.assertRaises(ValueError, dt.astimezone, tz=f) # naive
class Bogus(tzinfo):
def utcoffset(self, dt): return None
def dst(self, dt): return timedelta(0)
bog = Bogus()
self.assertRaises(ValueError, dt.astimezone, bog) # naive
self.assertRaises(ValueError,
dt.replace(tzinfo=bog).astimezone, f)
class AlsoBogus(tzinfo):
def utcoffset(self, dt): return timedelta(0)
def dst(self, dt): return None
alsobog = AlsoBogus()
self.assertRaises(ValueError, dt.astimezone, alsobog) # also naive
def test_pickling(self):
# Try one without a tzinfo.
args = 20, 59, 16, 64**2
orig = self.theclass(*args)
for pickler, unpickler, proto in pickle_choices:
green = pickler.dumps(orig, proto)
derived = unpickler.loads(green)
self.assertEqual(orig, derived)
# Try one with a tzinfo.
tinfo = PicklableFixedOffset(-300, 'cookie')
orig = self.theclass(5, 6, 7, tzinfo=tinfo)
for pickler, unpickler, proto in pickle_choices:
green = pickler.dumps(orig, proto)
derived = unpickler.loads(green)
self.assertEqual(orig, derived)
self.assertIsInstance(derived.tzinfo, PicklableFixedOffset)
self.assertEqual(derived.utcoffset(), timedelta(minutes=-300))
self.assertEqual(derived.tzname(), 'cookie')
def test_pickling(self):
# Try one without a tzinfo.
args = 6, 7, 23, 20, 59, 1, 64**2
orig = self.theclass(*args)
for pickler, unpickler, proto in pickle_choices:
green = pickler.dumps(orig, proto)
derived = unpickler.loads(green)
self.assertEqual(orig, derived)
# Try one with a tzinfo.
tinfo = PicklableFixedOffset(-300, 'cookie')
orig = self.theclass(*args, **{'tzinfo': tinfo})
derived = self.theclass(1, 1, 1, tzinfo=FixedOffset(0, "", 0))
for pickler, unpickler, proto in pickle_choices:
green = pickler.dumps(orig, proto)
derived = unpickler.loads(green)
self.assertEqual(orig, derived)
self.assertIsInstance(derived.tzinfo, PicklableFixedOffset)
self.assertEqual(derived.utcoffset(), timedelta(minutes=-300))
self.assertEqual(derived.tzname(), 'cookie')
def test_pickling_subclass(self):
# Make sure we can pickle/unpickle an instance of a subclass.
offset = timedelta(minutes=-300)
orig = PicklableFixedOffset(offset, 'cookie')
self.assertIsInstance(orig, tzinfo)
self.assertTrue(type(orig) is PicklableFixedOffset)
self.assertEqual(orig.utcoffset(None), offset)
self.assertEqual(orig.tzname(None), 'cookie')
for pickler, unpickler, proto in pickle_choices:
green = pickler.dumps(orig, proto)
derived = unpickler.loads(green)
self.assertIsInstance(derived, tzinfo)
self.assertTrue(type(derived) is PicklableFixedOffset)
self.assertEqual(derived.utcoffset(None), offset)
self.assertEqual(derived.tzname(None), 'cookie')
#############################################################################
# Base class for testing a particular aspect of timedelta, time, date and
# datetime comparisons.
def test_argument_passing(self):
cls = self.theclass
# A datetime passes itself on, a time passes None.
class introspective(tzinfo):
def tzname(self, dt): return dt and "real" or "none"
def utcoffset(self, dt):
return timedelta(minutes = dt and 42 or -42)
dst = utcoffset
obj = cls(1, 2, 3, tzinfo=introspective())
expected = cls is time and "none" or "real"
self.assertEqual(obj.tzname(), expected)
expected = timedelta(minutes=(cls is time and -42 or 42))
self.assertEqual(obj.utcoffset(), expected)
self.assertEqual(obj.dst(), expected)
def test_pickling(self):
# Try one without a tzinfo.
args = 6, 7, 23, 20, 59, 1, 64**2
orig = self.theclass(*args)
for pickler, unpickler, proto in pickle_choices:
green = pickler.dumps(orig, proto)
derived = unpickler.loads(green)
self.assertEqual(orig, derived)
# Try one with a tzinfo.
tinfo = PicklableFixedOffset(-300, 'cookie')
orig = self.theclass(*args, **{'tzinfo': tinfo})
derived = self.theclass(1, 1, 1, tzinfo=FixedOffset(0, "", 0))
for pickler, unpickler, proto in pickle_choices:
green = pickler.dumps(orig, proto)
derived = unpickler.loads(green)
self.assertEqual(orig, derived)
self.assertIsInstance(derived.tzinfo, PicklableFixedOffset)
self.assertEqual(derived.utcoffset(), timedelta(minutes=-300))
self.assertEqual(derived.tzname(), 'cookie')
def test_pickling_subclass(self):
# Make sure we can pickle/unpickle an instance of a subclass.
offset = timedelta(minutes=-300)
for otype, args in [
(PicklableFixedOffset, (offset, 'cookie')),
(timezone, (offset,)),
(timezone, (offset, "EST"))]:
orig = otype(*args)
oname = orig.tzname(None)
self.assertIsInstance(orig, tzinfo)
self.assertIs(type(orig), otype)
self.assertEqual(orig.utcoffset(None), offset)
self.assertEqual(orig.tzname(None), oname)
for pickler, unpickler, proto in pickle_choices:
green = pickler.dumps(orig, proto)
derived = unpickler.loads(green)
self.assertIsInstance(derived, tzinfo)
self.assertIs(type(derived), otype)
self.assertEqual(derived.utcoffset(None), offset)
self.assertEqual(derived.tzname(None), oname)
def test_issue23600(self):
DSTDIFF = DSTOFFSET = timedelta(hours=1)
class UKSummerTime(tzinfo):
"""Simple time zone which pretends to always be in summer time, since
that's what shows the failure.
"""
def utcoffset(self, dt):
return DSTOFFSET
def dst(self, dt):
return DSTDIFF
def tzname(self, dt):
return 'UKSummerTime'
tz = UKSummerTime()
u = datetime(2014, 4, 26, 12, 1, tzinfo=tz)
t = tz.fromutc(u)
self.assertEqual(t - t.utcoffset(), u)
def test_astimezone(self):
# Pretty boring! The TZ test is more interesting here. astimezone()
# simply can't be applied to a naive object.
dt = self.theclass.now()
f = FixedOffset(44, "")
self.assertRaises(ValueError, dt.astimezone) # naive
self.assertRaises(TypeError, dt.astimezone, f, f) # too many args
self.assertRaises(TypeError, dt.astimezone, dt) # arg wrong type
self.assertRaises(ValueError, dt.astimezone, f) # naive
self.assertRaises(ValueError, dt.astimezone, tz=f) # naive
class Bogus(tzinfo):
def utcoffset(self, dt): return None
def dst(self, dt): return timedelta(0)
bog = Bogus()
self.assertRaises(ValueError, dt.astimezone, bog) # naive
self.assertRaises(ValueError,
dt.replace(tzinfo=bog).astimezone, f)
class AlsoBogus(tzinfo):
def utcoffset(self, dt): return timedelta(0)
def dst(self, dt): return None
alsobog = AlsoBogus()
self.assertRaises(ValueError, dt.astimezone, alsobog) # also naive
def test_argument_passing(self):
cls = self.theclass
# A datetime passes itself on, a time passes None.
class introspective(tzinfo):
def tzname(self, dt): return dt and "real" or "none"
def utcoffset(self, dt):
return timedelta(minutes = dt and 42 or -42)
dst = utcoffset
obj = cls(1, 2, 3, tzinfo=introspective())
expected = cls is time and "none" or "real"
self.assertEqual(obj.tzname(), expected)
expected = timedelta(minutes=(cls is time and -42 or 42))
self.assertEqual(obj.utcoffset(), expected)
self.assertEqual(obj.dst(), expected)
def test_pickling(self):
# Try one without a tzinfo.
args = 20, 59, 16, 64**2
orig = self.theclass(*args)
for pickler, unpickler, proto in pickle_choices:
green = pickler.dumps(orig, proto)
derived = unpickler.loads(green)
self.assertEqual(orig, derived)
# Try one with a tzinfo.
tinfo = PicklableFixedOffset(-300, 'cookie')
orig = self.theclass(5, 6, 7, tzinfo=tinfo)
for pickler, unpickler, proto in pickle_choices:
green = pickler.dumps(orig, proto)
derived = unpickler.loads(green)
self.assertEqual(orig, derived)
self.assertIsInstance(derived.tzinfo, PicklableFixedOffset)
self.assertEqual(derived.utcoffset(), timedelta(minutes=-300))
self.assertEqual(derived.tzname(), 'cookie')
def test_pickling_subclass(self):
# Make sure we can pickle/unpickle an instance of a subclass.
offset = timedelta(minutes=-300)
orig = PicklableFixedOffset(offset, 'cookie')
self.assertIsInstance(orig, tzinfo)
self.assertTrue(type(orig) is PicklableFixedOffset)
self.assertEqual(orig.utcoffset(None), offset)
self.assertEqual(orig.tzname(None), 'cookie')
for pickler, unpickler, proto in pickle_choices:
green = pickler.dumps(orig, proto)
derived = unpickler.loads(green)
self.assertIsInstance(derived, tzinfo)
self.assertTrue(type(derived) is PicklableFixedOffset)
self.assertEqual(derived.utcoffset(None), offset)
self.assertEqual(derived.tzname(None), 'cookie')
#############################################################################
# Base clase for testing a particular aspect of timedelta, time, date and
# datetime comparisons.
def test_argument_passing(self):
cls = self.theclass
# A datetime passes itself on, a time passes None.
class introspective(tzinfo):
def tzname(self, dt): return dt and "real" or "none"
def utcoffset(self, dt):
return timedelta(minutes = dt and 42 or -42)
dst = utcoffset
obj = cls(1, 2, 3, tzinfo=introspective())
expected = cls is time and "none" or "real"
self.assertEqual(obj.tzname(), expected)
expected = timedelta(minutes=(cls is time and -42 or 42))
self.assertEqual(obj.utcoffset(), expected)
self.assertEqual(obj.dst(), expected)
def test_pickling(self):
# Try one without a tzinfo.
args = 6, 7, 23, 20, 59, 1, 64**2
orig = self.theclass(*args)
for pickler, unpickler, proto in pickle_choices:
green = pickler.dumps(orig, proto)
derived = unpickler.loads(green)
self.assertEqual(orig, derived)
# Try one with a tzinfo.
tinfo = PicklableFixedOffset(-300, 'cookie')
orig = self.theclass(*args, **{'tzinfo': tinfo})
derived = self.theclass(1, 1, 1, tzinfo=FixedOffset(0, "", 0))
for pickler, unpickler, proto in pickle_choices:
green = pickler.dumps(orig, proto)
derived = unpickler.loads(green)
self.assertEqual(orig, derived)
self.assertIsInstance(derived.tzinfo, PicklableFixedOffset)
self.assertEqual(derived.utcoffset(), timedelta(minutes=-300))
self.assertEqual(derived.tzname(), 'cookie')
def test_pickling_subclass(self):
# Make sure we can pickle/unpickle an instance of a subclass.
offset = timedelta(minutes=-300)
for otype, args in [
(PicklableFixedOffset, (offset, 'cookie')),
(timezone, (offset,)),
(timezone, (offset, "EST"))]:
orig = otype(*args)
oname = orig.tzname(None)
self.assertIsInstance(orig, tzinfo)
self.assertIs(type(orig), otype)
self.assertEqual(orig.utcoffset(None), offset)
self.assertEqual(orig.tzname(None), oname)
for pickler, unpickler, proto in pickle_choices:
green = pickler.dumps(orig, proto)
derived = unpickler.loads(green)
self.assertIsInstance(derived, tzinfo)
self.assertIs(type(derived), otype)
self.assertEqual(derived.utcoffset(None), offset)
self.assertEqual(derived.tzname(None), oname)
def test_astimezone(self):
# Pretty boring! The TZ test is more interesting here. astimezone()
# simply can't be applied to a naive object.
dt = self.theclass.now()
f = FixedOffset(44, "")
self.assertRaises(ValueError, dt.astimezone) # naive
self.assertRaises(TypeError, dt.astimezone, f, f) # too many args
self.assertRaises(TypeError, dt.astimezone, dt) # arg wrong type
self.assertRaises(ValueError, dt.astimezone, f) # naive
self.assertRaises(ValueError, dt.astimezone, tz=f) # naive
class Bogus(tzinfo):
def utcoffset(self, dt): return None
def dst(self, dt): return timedelta(0)
bog = Bogus()
self.assertRaises(ValueError, dt.astimezone, bog) # naive
self.assertRaises(ValueError,
dt.replace(tzinfo=bog).astimezone, f)
class AlsoBogus(tzinfo):
def utcoffset(self, dt): return timedelta(0)
def dst(self, dt): return None
alsobog = AlsoBogus()
self.assertRaises(ValueError, dt.astimezone, alsobog) # also naive
def test_argument_passing(self):
cls = self.theclass
# A datetime passes itself on, a time passes None.
class introspective(tzinfo):
def tzname(self, dt): return dt and "real" or "none"
def utcoffset(self, dt):
return timedelta(minutes = dt and 42 or -42)
dst = utcoffset
obj = cls(1, 2, 3, tzinfo=introspective())
expected = cls is time and "none" or "real"
self.assertEqual(obj.tzname(), expected)
expected = timedelta(minutes=(cls is time and -42 or 42))
self.assertEqual(obj.utcoffset(), expected)
self.assertEqual(obj.dst(), expected)
def test_pickling(self):
# Try one without a tzinfo.
args = 20, 59, 16, 64**2
orig = self.theclass(*args)
for pickler, unpickler, proto in pickle_choices:
green = pickler.dumps(orig, proto)
derived = unpickler.loads(green)
self.assertEqual(orig, derived)
# Try one with a tzinfo.
tinfo = PicklableFixedOffset(-300, 'cookie')
orig = self.theclass(5, 6, 7, tzinfo=tinfo)
for pickler, unpickler, proto in pickle_choices:
green = pickler.dumps(orig, proto)
derived = unpickler.loads(green)
self.assertEqual(orig, derived)
self.assertIsInstance(derived.tzinfo, PicklableFixedOffset)
self.assertEqual(derived.utcoffset(), timedelta(minutes=-300))
self.assertEqual(derived.tzname(), 'cookie')
def test_pickling(self):
# Try one without a tzinfo.
args = 6, 7, 23, 20, 59, 1, 64**2
orig = self.theclass(*args)
for pickler, unpickler, proto in pickle_choices:
green = pickler.dumps(orig, proto)
derived = unpickler.loads(green)
self.assertEqual(orig, derived)
# Try one with a tzinfo.
tinfo = PicklableFixedOffset(-300, 'cookie')
orig = self.theclass(*args, **{'tzinfo': tinfo})
derived = self.theclass(1, 1, 1, tzinfo=FixedOffset(0, "", 0))
for pickler, unpickler, proto in pickle_choices:
green = pickler.dumps(orig, proto)
derived = unpickler.loads(green)
self.assertEqual(orig, derived)
self.assertIsInstance(derived.tzinfo, PicklableFixedOffset)
self.assertEqual(derived.utcoffset(), timedelta(minutes=-300))
self.assertEqual(derived.tzname(), 'cookie')
