Bug fix: copy the timezone in which the date is represented.

git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@13857 20353a03-c40f-0410-a6d1-a30d3c3de9de

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