Fixed #21363 -- Added datetime.timedelta support to TimestampSigner.unsign().

docs/releases/1.8.txt

@@ -186,6 +186,13 @@ Cache
 * The ``incr()`` method of the
   ``django.core.cache.backends.locmem.LocMemCache`` backend is now thread-safe.
 
+Cryptography
+^^^^^^^^^^^^
+
+* The ``max_age`` parameter of the
+  :meth:`django.core.signing.TimestampSigner.unsign` method now also accept a
+  :py:class:`datetime.timedelta` object.
+
 Database backends
 ^^^^^^^^^^^^^^^^^