diff -r 162743b7f59b Lib/http/cookiejar.py
--- a/Lib/http/cookiejar.py	Wed Apr 08 11:24:51 2015 +0300
+++ b/Lib/http/cookiejar.py	Thu May 07 16:23:14 2015 -0500
@@ -758,7 +758,7 @@
                  ):
 
         if version is not None: version = int(version)
-        if expires is not None: expires = int(expires)
+        if expires is not None: expires = int(float(expires))
         if port is None and port_specified is True:
             raise ValueError("if port is None, port_specified must be false")
 
diff -r 162743b7f59b Lib/test/test_http_cookiejar.py
--- a/Lib/test/test_http_cookiejar.py	Wed Apr 08 11:24:51 2015 +0300
+++ b/Lib/test/test_http_cookiejar.py	Thu May 07 16:23:14 2015 -0500
@@ -566,6 +566,16 @@
         self.assertEqual(len(c), 1)
         self.assertIn('spam="bar"', h)
 
+        # test if fractional expiry is accepted
+        cookie  = Cookie(0, "name", "value",
+                         None, False, "www.python.org", 
+                         True, False, "/", 
+                         False, False, "1444312383.018307",
+                         False, None, None,
+                         {})
+        self.assertEqual(cookie.expires, 1444312383)
+
+
         # XXX RFC 2965 expiry rules (some apply to V0 too)
 
     def test_default_path(self):