  import pytest
  from django.http import QueryDict
  from django.test import TestCase, override_settings
  from django.utils import six
  from django.utils.timezone import utc, pytz
  
  import rest_framework
  from rest_framework import serializers
  from rest_framework.fields import is_simple_callable
  
 
</s> remove         '2017-03-12T02:30:00': [
            'Datetime can not be converted to server timezone due to NonExistentTimeError.'],
        '2017-11-05T01:30:00': [
            'Datetime can not be converted to server timezone due to AmbiguousTimeError.']
 </s> add         '2017-03-12T02:30:00': ['Datetime can not be represented in timezone "America/New_York".'],
        '2017-11-05T01:30:00': ['Datetime can not be represented in timezone "America/New_York".'] </s> remove             return timezone.make_aware(value, field_timezone)
 </s> add             try:
                return timezone.make_aware(value, field_timezone)
            except Exception:
                self.fail('make_aware', timezone=field_timezone)
from django.utils.timezone import pytz, utc
  import pytest
  from django.http import QueryDict
  from django.test import TestCase, override_settings
  from django.utils import six
from django.utils.timezone import pytz, utc
  
  import rest_framework
  from rest_framework import serializers
  from rest_framework.fields import is_simple_callable
  
keep keep keep keep replace keep keep keep keep keep
 Fix bug for not existent or ambiguous datetime during native to aware conversion in timezone with DST.
Ref: #4986 
tests/test_fields.py