       from 2017-11-05T02:00:00 to 2017-11-05T01:00:00 in 2017.
      """
      valid_inputs = {}
      invalid_inputs = {
          '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.']
      }
      outputs = {}
      field = serializers.DateTimeField(default_timezone=pytz.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) </s> remove from django.utils.timezone import utc, pytz
 </s> add from django.utils.timezone import pytz, utc
        '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".']
       from 2017-11-05T02:00:00 to 2017-11-05T01:00:00 in 2017.
      """
      valid_inputs = {}
      invalid_inputs = {
        '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".']
        '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".']
        '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".']
        '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".']
      }
      outputs = {}
      field = serializers.DateTimeField(default_timezone=pytz.timezone('America/New_York'))
  
  
keep keep keep keep replace replace replace 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