diff --git a/product/ERP5Type/DateUtils.py b/product/ERP5Type/DateUtils.py
index 3788310e14438e47be0b282744bcee0685f91eb3..55fce9a60db442a9792314de4f828a29f42e8efb 100644
--- a/product/ERP5Type/DateUtils.py
+++ b/product/ERP5Type/DateUtils.py
@@ -97,7 +97,7 @@ def addToDate(date, to_add=None, **kw):
                                                 return_value['hour'],
                                                 return_value['minute'],
                                                 return_value['second'],
-                                                date.localZone()))
+                                                date.timezone()))
   return_date += day_to_add
   return return_date