  from django.forms import widgets
  from django.utils.encoding import is_protected_type
  from django.utils.translation import ugettext_lazy as _
  
  from rest_framework import ISO8601
  from rest_framework.compat import timezone, parse_date, parse_datetime, parse_time
  from rest_framework.compat import BytesIO
  from rest_framework.compat import six
  from rest_framework.compat import smart_text
  from rest_framework.settings import api_settings
 
</s> remove from rest_framework.utils.dates import get_readable_date_format
 </s> add  </s> remove from rest_framework import ISO8601
 </s> add from rest_framework import ISO_8601 </s> remove     'TIME_OUTPUT_FORMAT': ISO8601,
 </s> add     'TIME_FORMAT': ISO_8601, </s> remove ISO8601 = 'iso-8601' </s> add  </s> remove                                           "HH:MM[:ss[.uuuuuu]]"])
 </s> add                                           "hh:mm[:ss[.uuuuuu]]"])
from rest_framework import ISO_8601
  from django.forms import widgets
  from django.utils.encoding import is_protected_type
  from django.utils.translation import ugettext_lazy as _
  
from rest_framework import ISO_8601
  from rest_framework.compat import timezone, parse_date, parse_datetime, parse_time
  from rest_framework.compat import BytesIO
  from rest_framework.compat import six
  from rest_framework.compat import smart_text
  from rest_framework.settings import api_settings
keep keep keep keep replace keep keep keep keep keep
 Clean ups to datetime formatting 
rest_framework/fields.py