diff --git a/aiohttp/helpers.py b/aiohttp/helpers.py
index 0a34f9a1bc8..eb542ba96b0 100644
--- a/aiohttp/helpers.py
+++ b/aiohttp/helpers.py
@@ -254,7 +254,7 @@ def atoms(message, environ, response, transport, request_time):
         'f': headers.get(hdrs.REFERER, '-'),
         'a': headers.get(hdrs.USER_AGENT, '-'),
         'T': str(int(request_time)),
-        'D': str(request_time).split('.', 1)[-1][:5],
+        'D': str(request_time).split('.', 1)[-1][:6],
         'p': "<%s>" % os.getpid()
     }
 
diff --git a/tests/test_helpers.py b/tests/test_helpers.py
index 875e99fa28f..dc9e94be4a6 100644
--- a/tests/test_helpers.py
+++ b/tests/test_helpers.py
@@ -116,6 +116,17 @@ def prop(self):
             a.prop = 123
 
 
+class TestAtoms(unittest.TestCase):
+
+    def test_get_seconds_and_milliseconds(self):
+        response = dict(status=200, output_length=1)
+        request_time = 321.012345678901234
+
+        atoms = helpers.atoms(None, None, response, None, request_time)
+        self.assertEqual(atoms['T'], '321')
+        self.assertEqual(atoms['D'], '012345')
+
+
 class TestSafeAtoms(unittest.TestCase):
 
     def test_get_non_existing(self):