diff --git a/Lib/test/test_urllibnet.py b/Lib/test/test_urllibnet.py
index ffb8b988910..b92bfc9c69f 100644
--- a/Lib/test/test_urllibnet.py
+++ b/Lib/test/test_urllibnet.py
@@ -8,6 +8,7 @@ import urllib
 import sys
 import os
 import mimetools
+import time
 
 
 def _open_with_retry(func, host, *args, **kwargs):
@@ -178,6 +179,16 @@ class urlretrieveNetworkTests(unittest.TestCase):
         self.assert_(isinstance(header, mimetools.Message),
                      "header is not an instance of mimetools.Message")
 
+    def test_data_header(self):
+        logo = "http://www.python.org/community/logos/python-logo-master-v3-TM.png"
+        file_location, fileheaders = self.urlretrieve(logo)
+        os.unlink(file_location)
+        datevalue = fileheaders.getheader('Date')
+        dateformat = '%a, %d %b %Y %H:%M:%S GMT'
+        try:
+            time.strptime(datevalue, dateformat)
+        except ValueError:
+            self.fail('Date value not in %r format', dateformat)
 
 
 def test_main():
diff --git a/Lib/urllib.py b/Lib/urllib.py
index e12d981ad02..70900cd211e 100644
--- a/Lib/urllib.py
+++ b/Lib/urllib.py
@@ -592,7 +592,7 @@ class URLopener:
         else:
             encoding = ''
         msg = []
-        msg.append('Date: %s'%time.strftime('%a, %d %b %Y %T GMT',
+        msg.append('Date: %s'%time.strftime('%a, %d %b %Y %H:%M:%S GMT',
                                             time.gmtime(time.time())))
         msg.append('Content-type: %s' % type)
         if encoding == 'base64':