[IMP] calendar: Set default value for start* and stop* date/datetime. Else field.function start and stop are not setted by default while they are required.

addons/calendar/calendar.py

@@ -960,6 +960,8 @@ class calendar_event(osv.Model):
         'active': 1,
         'user_id': lambda self, cr, uid, ctx: uid,
         'partner_ids': _get_default_partners,
+        'start_datetime': lambda *x: datetime.now(),
+        'stop_datetime': lambda *x: datetime.now() + relativedelta(hours=1),
     }
 
     def _check_closing_date(self, cr, uid, ids, context=None):