Fixed #26653 -- Made SyndicationFeed.latest_post_date() return time in UTC.

django/utils/feedgenerator.py

@@ -31,6 +31,7 @@ from django.utils.deprecation import RemovedInDjango20Warning
 from django.utils.encoding import force_text, iri_to_uri
 from django.utils.six import StringIO
 from django.utils.six.moves.urllib.parse import urlparse
+from django.utils.timezone import utc
 from django.utils.xmlutils import SimplerXMLGenerator
 
 
@@ -211,7 +212,7 @@ class SyndicationFeed(object):
     def latest_post_date(self):
         """
         Returns the latest item's pubdate or updateddate. If no items
-        have either of these attributes this returns the current date/time.
+        have either of these attributes this returns the current UTC date/time.
         """
         latest_date = None
         date_keys = ('updateddate', 'pubdate')
@@ -223,7 +224,8 @@ class SyndicationFeed(object):
                     if latest_date is None or item_date > latest_date:
                         latest_date = item_date
 
-        return latest_date or datetime.datetime.now()
+        # datetime.now(tz=utc) is slower, as documented in django.utils.timezone.now
+        return latest_date or datetime.datetime.utcnow().replace(tzinfo=utc)
 
 
 class Enclosure(object):

docs/ref/utils.txt

@@ -397,7 +397,12 @@ https://web.archive.org/web/20110718035220/http://diveintomark.org/archives/2004
 
         Returns the latest ``pubdate`` or ``updateddate`` for all items in the
         feed. If no items have either of these attributes this returns the
-        current date/time.
+        current UTC date/time.
+
+        .. versionchanged:: 1.11
+
+            In older versions, it returned the current date/time without any
+            timezone information.
 
 ``Enclosure``
 -------------

docs/releases/1.11.txt

@@ -207,7 +207,11 @@ Database backend API
 Miscellaneous
 -------------
 
-* ...
+* If no items in the feed have a ``pubdate`` or ``updateddate`` attribute,
+  :meth:`SyndicationFeed.latest_post_date()
+  <django.utils.feedgenerator.SyndicationFeed.latest_post_date>` now returns
+  the current UTC date/time, instead of a datetime without any timezone
+  information.
 
 .. _deprecated-features-1.11:
 

tests/utils_tests/test_feedgenerator.py

@@ -1,13 +1,13 @@
 from __future__ import unicode_literals
 
 import datetime
-import unittest
 
+from django.test import SimpleTestCase
 from django.utils import feedgenerator
-from django.utils.timezone import get_fixed_timezone
+from django.utils.timezone import get_fixed_timezone, utc
 
 
-class FeedgeneratorTest(unittest.TestCase):
+class FeedgeneratorTest(SimpleTestCase):
     """
     Tests for the low-level syndication feed framework.
     """
@@ -121,3 +121,9 @@ class FeedgeneratorTest(unittest.TestCase):
         self.assertIn('<atom:link', feed_content)
         self.assertIn('href="/feed/"', feed_content)
         self.assertIn('rel="self"', feed_content)
+
+    def test_latest_post_date_returns_utc_time(self):
+        for use_tz in (True, False):
+            with self.settings(USE_TZ=use_tz):
+                rss_feed = feedgenerator.Rss201rev2Feed('title', 'link', 'description')
+                self.assertEqual(rss_feed.latest_post_date().tzinfo, utc)