diff --git a/golem_activity/models/golem_activity.py b/golem_activity/models/golem_activity.py
index caff6cf..f55926a 100644
--- a/golem_activity/models/golem_activity.py
+++ b/golem_activity/models/golem_activity.py
@@ -17,8 +17,19 @@
 
 """ GOLEM activities related models """
 
+import collections
+from datetime import datetime, timedelta
+from dateutil import parser
+#from dateutil import rrule
+from dateutil.rrule import WEEKLY, rrule
+from dateutil.relativedelta import relativedelta
+
 from odoo import models, fields, api, _
 from datetime import timedelta
+from odoo.tools import DEFAULT_SERVER_DATE_FORMAT, DEFAULT_SERVER_DATETIME_FORMAT
+#from dateutil import rrule
+#from dateutil.rrule import rrule
+#from dateutil.rrule import rrule
 
 class GolemActivityType(models.Model):
     """ GOLEM Activity Type """
@@ -143,13 +154,13 @@ class GolemActivity(models.Model):
                 if not activity.date_stop:
                     activity.date_stop = activity.season_id.date_end
 
-    weekday = fields.Selection([('mon', _('Monday')),
-                                ('tue', _('Tuesday')),
-                                ('wed', _('Wednesday')),
-                                ('thu', _('Thursday')),
-                                ('fri', _('Friday')),
-                                ('sat', _('Saturday')),
-                                ('sun', _('Sunday'))], copy=False)
+    weekday = fields.Selection([(0, _('Monday')),
+                                (1, _('Tuesday')),
+                                (2, _('Wednesday')),
+                                (3, _('Thursday')),
+                                (4, _('Friday')),
+                                (5, _('Saturday')),
+                                (6, _('Sunday'))], copy=False)
     hour_start = fields.Float('Start time', copy=False)
     hour_stop = fields.Float('Stop time', copy=False)
 
@@ -191,7 +202,15 @@ class GolemActivity(models.Model):
         result = []
         for calendar_id, real_id in select:
             res = real_data[real_id].copy()
+
+            date_start = str(calendar_id).split('_')
+            if len(date_start) == 2:
+                dt = datetime.strptime(date_start[1],DEFAULT_SERVER_DATETIME_FORMAT).date()# "%y-%m-%d %H:%M:%S")
+                res['date_start'] = str(dt)
             res['id'] = calendar_id
+
+
+            #res['date_start'] = date_start[1]
             result.append(res)
         return result
 
@@ -223,16 +242,23 @@ class GolemActivity(models.Model):
 
     @api.multi
     def real_id2calendar_id(self, record_id):
+        """ convert Real Id to Calendar ID """
         activity = self.env['golem.activity'].browse(record_id)
-        dates = []
-        delta = timedelta(days=7)
-        date = fields.Date.from_string(activity.date_start)
-        while date <= fields.Date.from_string(activity.date_stop):
-            print date
-            print activity.date_stop
-            dates.append('%s_%s' % (record_id, date))
-            date += delta
-        return dates
+        date_start = fields.Date.from_string(activity.date_start)
+        date_stop = fields.Date.from_string(activity.date_stop)
+        weekday = 0#date_start.weekday()
+        if activity.weekday:
+            weekday = activity.weekday
+        print '_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-'
+        print weekday
+        list_date = list(rrule(freq=WEEKLY, dtstart=date_start, until=date_stop, byweekday=weekday))
+        calendar_ids = []
+        for date in list_date:
+            calendar_ids.append('%s_%s' % (record_id, date))
+        print '_______________________________________________'
+        print calendar_ids
+        return calendar_ids
+
 
     @api.multi
     def get_recurrent_ids(self):