diff --git a/tryton/client.py b/tryton/client.py
index 81c0d4fbb0..2f770b8ab6 100644
--- a/tryton/client.py
+++ b/tryton/client.py
@@ -16,6 +16,8 @@ from config import CONFIG, CURRENT_DIR, PREFIX, PIXMAPS_DIR, TRYTON_ICON
 import translate
 import gui
 import traceback
+import mx.DateTime
+import time
 
 
 class TrytonClient(object):
@@ -42,6 +44,10 @@ class TrytonClient(object):
         else:
             logging.getLogger().setLevel(logging.ERROR)
 
+        if not hasattr(mx.DateTime, 'strptime'):
+            mx.DateTime.strptime = lambda x, y: mx.DateTime.mktime(
+                    time.strptime(x, y))
+
         factory = gtk.IconFactory()
         factory.add_default()