From e61a4f19cf5f89c2506a5f6a3e61b0d2d864efc2 Mon Sep 17 00:00:00 2001
From: cabbagenom <calumcalder@hotmail.co.uk>
Date: Sun, 27 Mar 2016 12:08:52 +0100
Subject: [PATCH] DateTimeField to_representation string check str ->
 six.string_types

---
 rest_framework/fields.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/rest_framework/fields.py b/rest_framework/fields.py
index 16074b76a..d4496a2e8 100644
--- a/rest_framework/fields.py
+++ b/rest_framework/fields.py
@@ -1072,7 +1072,7 @@ class DateTimeField(Field):
             return value
 
         if output_format.lower() == ISO_8601:
-            if isinstance(value, str):
+            if isinstance(value, six.string_types):
                 format_strings = (format_prefix + timezone_extension
                                   for format_prefix in ('%Y-%m-%dT%H:%M', '%Y-%m-%dT%H:%M:%S', '%Y-%m-%dT%H:%M:%S.%f')
                                   for timezone_extension in ('', '%Z', '%z'))