diff --git a/addons/calendar/calendar.py b/addons/calendar/calendar.py
index de6ab511446..0a56d5a31c1 100644
--- a/addons/calendar/calendar.py
+++ b/addons/calendar/calendar.py
@@ -764,7 +764,7 @@ class calendar_event(osv.Model):
         if not tz:  # tz can have a value False, so dont do it in the default value of get !
             context['tz'] = self.pool.get('res.users').read(cr, SUPERUSER_ID, uid, ['tz'])['tz']
             tz = context['tz']
-        tz = tools.ustr(tz).encode('utf-8')  # make safe for str{p,f}time()
+        tz = tools.ustr(tz).encode('utf-8') # make safe for str{p,f}time()
 
         format_date, format_time = self.get_date_formats(cr, uid, context=context)
         date = fields.datetime.context_timestamp(cr, uid, datetime.strptime(start, tools.DEFAULT_SERVER_DATETIME_FORMAT), context=context)
@@ -960,8 +960,6 @@ 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):