def test_transition_backward(self):
tz_names = ['Europe/London']
before = datetime(2021, 10, 31, 0, 59, 59, 999999, tzinfo=pytz.utc)
after = datetime(2021, 10, 31, 1, 0, 0, 0, tzinfo=pytz.utc)
self.assertEqual(with_gmt_offset(tz_names, now=before),
[('Europe/London', 'GMT+01:00 Europe/London')])
self.assertEqual(with_gmt_offset(tz_names, now=after),
[('Europe/London', 'GMT+00:00 Europe/London')])
def __init__(self, *args, **kwargs):
kwargs.setdefault('coerce', coerce_to_pytz)
kwargs.setdefault('empty_value', None)
if 'choices' in kwargs:
values, displays = zip(*kwargs['choices'])
else:
values = pytz.common_timezones
displays = None
choices_display = kwargs.pop('choices_display', None)
if choices_display == 'WITH_GMT_OFFSET':
choices = with_gmt_offset(values)
elif choices_display == 'STANDARD':
choices = standard(values)
elif choices_display is None:
choices = zip(values, displays) if displays else standard(values)
else:
raise ValueError(
"Unrecognized value for kwarg 'choices_display' of '"
+ choices_display + "'"
)
kwargs['choices'] = choices
super(TimeZoneFormField, self).__init__(*args, **kwargs)
def test_in_northern_winter(self):
now = datetime(2020, 1, 15)
result = with_gmt_offset(self.tz_names, now=now)
self.assertEqual(result, [
('America/Los_Angeles', 'GMT-08:00 America/Los Angeles'),
('Canada/Newfoundland', 'GMT-03:30 Canada/Newfoundland'),
('America/Santiago', 'GMT-03:00 America/Santiago'),
('Europe/London', 'GMT+00:00 Europe/London'),
])
def test_using_timezone_names(self):
result = with_gmt_offset(self.tz_names)
self.assertEqual(result, [
('America/Argentina/Buenos_Aires',
'GMT-03:00 America/Argentina/Buenos Aires'),
('Asia/Qatar', 'GMT+03:00 Asia/Qatar'),
('Asia/Kolkata', 'GMT+05:30 Asia/Kolkata'),
('Asia/Kathmandu', 'GMT+05:45 Asia/Kathmandu'),
])
def test_in_northern_summer(self):
now = datetime(2020, 7, 15, tzinfo=pytz.utc)
result = with_gmt_offset(self.tz_names, now=now)
self.assertEqual(result, [
('America/Los_Angeles', 'GMT-07:00 America/Los Angeles'),
('America/Santiago', 'GMT-04:00 America/Santiago'),
('Canada/Newfoundland', 'GMT-02:30 Canada/Newfoundland'),
('Europe/London', 'GMT+01:00 Europe/London'),
])
def __init__(self, *args, **kwargs):
# allow some use of positional args up until the args we customize
# https://github.com/mfogel/django-timezone-field/issues/42
# https://github.com/django/django/blob/1.11.11/django/db/models/fields/__init__.py#L145
if len(args) > 3:
raise ValueError('Cannot specify max_length by positional arg')
kwargs.setdefault('max_length', self.default_max_length)
if 'choices' in kwargs:
values, displays = zip(*kwargs['choices'])
# Choices can be specified in two forms: either
# [<pytz.timezone>, <str>] or [<str>, <str>]
#
# The [<pytz.timezone>, <str>] format is the one we actually
# store the choices in memory because of
# https://github.com/mfogel/django-timezone-field/issues/24
#
# The [<str>, <str>] format is supported because since django
# can't deconstruct pytz.timezone objects, migration files must
# use an alternate format. Representing the timezones as strings
# is the obvious choice.
if not is_pytz_instance(values[0]):
values = [pytz.timezone(v) for v in values]
else:
values = self.default_tzs
displays = None
choices_display = kwargs.pop('choices_display', None)
if choices_display == 'WITH_GMT_OFFSET':
choices = with_gmt_offset(values)
elif choices_display == 'STANDARD':
choices = standard(values)
elif choices_display is None:
choices = zip(values, displays) if displays else standard(values)
else:
raise ValueError(
"Unrecognized value for kwarg 'choices_display' of '" +
choices_display + "'")
# 'display_GMT_offset' is deprecated, use 'choices_display' instead
if kwargs.pop('display_GMT_offset', False):
choices = add_gmt_offset_to_choices(choices)
kwargs['choices'] = choices
super(TimeZoneField, self).__init__(*args, **kwargs)
