diff --git a/addons/event/event.py b/addons/event/event.py
index 0eb2dda8312..57ccf674a24 100644
--- a/addons/event/event.py
+++ b/addons/event/event.py
@@ -19,6 +19,7 @@
 #
 ##############################################################################
 
+from datetime import datetime, timedelta, date
 from osv import fields, osv
 from tools.translate import _
 from openerp import SUPERUSER_ID
@@ -288,6 +289,13 @@ class event_event(osv.osv):
 
         return {'value' : values}
 
+    def onchange_start_date(self, cr, uid, ids, date_end, date_begin, context=None):
+        value = {}
+        if date_begin:
+            start = datetime.strptime(date_begin, "%Y-%m-%d %H:%M:%S")
+            if not date_end or date_end:
+                date_end = start + timedelta(hours=1.00)
+            return {'value': {'date_end':date_end.strftime("%Y-%m-%d %H:%M:%S")}}
 
     # ----------------------------------------
     # OpenChatter methods and notifications
diff --git a/addons/event/event_view.xml b/addons/event/event_view.xml
index 6ad8fb20467..978fc71689f 100644
--- a/addons/event/event_view.xml
+++ b/addons/event/event_view.xml
@@ -134,7 +134,7 @@
                                 </group>
                                 <group>
                                     <field name="type" on_change="onchange_event_type(type,context)"/>
-                                    <field name="date_begin"/>
+                                    <field name="date_begin" on_change="onchange_start_date(date_end,date_begin,context)"/>
                                     <field name="date_end"/>
                                 </group>
                             </group>