Openerp 7 the below code (overridden ORM load method to change the Import Data format

def checkdatatype(self, cr, uid, date, context=None):
       dateValue = False
       data = {}
       for format in ['%Y%m%d']:
            try:
                result = datetime.datetime.strptime(date, format)
                datatype = (date == result.strftime(format)) 
            except:
                pass
       if  datatype:
           msg = 'Date Type'
           data['msg'] = 'Date Type'
       else:
            msg = 'other'
            data['msg'] = 'other'
       return data     

    def load(self, cr, uid, fields, data, context=None):
        Listalldata = []
        for value in data:
            Listdata = list(value)
            Listalldata.append(Listdata)
        for listvalue in Listalldata:        
            for i, val in enumerate(listvalue):
                res = self.checkdatatype(cr, uid, str(val), context=context)
                if res['msg']=='Date Type':
                     listvalue[i] = datetime.datetime.strptime(val, '%Y%m%d').strftime('%Y-%m-%d')
        data = []
        for val in Listalldata:
            Listalldata = tuple(val)
            data.append(Listalldata)         
        return super(model_class_name, self).load(cr, uid, fields, data, context=context)