hi all

i have this field

class holidays_detail(models.Model):
    _name = 'holiday.detail'

    date_start = fields.Date(string='Start Date',required=True )   

     hari = fields.Char(string='Day')

i want when i choose date ini field date_start its onchange to field hari with value (weekday name ex :Sunday)

i have this method

def onchange_date(self, cr, uid, ids, date_start):
        res ={}       

         if date_start :
            a = datetime.strptime(date_start,"%Y-%m-%d")           

             if a :
                b = datetime.strftime(a, '%A')               

                res = {'hari': b }                

             return {'value': res}      

          return True

its work ! but when i save its getting error  like this

File "/home/susi/odoo/openerp-8.0/openerp/sql_db.py", line 234, in execute    res = self._obj.execute(query, params)

DataError: invalid input syntax for integer: "Friday"

LINE 1: ...('holiday_detail_id_seq'), 7, '2016-09-23', NULL, 'Friday', ...

                                                             ^

anyone can help me what wrong with my code ? thanks before