diff --git a/rest_framework/fields.py b/rest_framework/fields.py
index 7bac2a21f6..deca9d90dc 100644
--- a/rest_framework/fields.py
+++ b/rest_framework/fields.py
@@ -1139,7 +1139,7 @@ def to_representation(self, value):
)
if output_format.lower() == ISO_8601:
- if (isinstance(value, str)):
+ if isinstance(value, six.string_types):
value = datetime.datetime.strptime(value, '%Y-%m-%d').date()
return value.isoformat()
diff --git a/tests/test_fields.py b/tests/test_fields.py
index 029a5bddcc..4b3a36f031 100644
--- a/tests/test_fields.py
+++ b/tests/test_fields.py
@@ -6,7 +6,7 @@
import django
import pytest
from django.http import QueryDict
-from django.utils import timezone
+from django.utils import six, timezone
import rest_framework
from rest_framework import serializers
@@ -895,6 +895,7 @@ class TestDateField(FieldValues):
outputs = {
datetime.date(2001, 1, 1): '2001-01-01',
'2001-01-01': '2001-01-01',
+ six.text_type('2016-01-10'): '2016-01-10',
None: None,
'': None,
}
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