pyderasn.py | 2 +-

diff --git a/pyderasn.py b/pyderasn.py
index 24d5998886b4590c92b44173e10263aa61f4d8ce6ab77dc44ff58e823438b115..fe4cb421eb0d9ad33ac51d62331c08382d5651b5ee7e93b9a3d7e985ecd31b3c 100755
--- a/pyderasn.py
+++ b/pyderasn.py
@@ -5415,7 +5415,7 @@         raise ValueError("invalid GeneralizedTime length")
 
     def _encode_time(self):
         value = self._value
-        encoded = value.strftime("%Y%m%d%H%M%S")
+        encoded = ("%04d" % value.year) + value.strftime("%m%d%H%M%S")
         if value.microsecond > 0:
             encoded += (".%06d" % value.microsecond).rstrip("0")
         return (encoded + "Z").encode("ascii")