public List <DateTime?> GetListDates(int Year, int Month)
        {
            var contexto = new ATLANEntities();

            try
            {
                return(contexto.usp_ST_SYSFLEX_GET_RENEW_DATES(Year, Month).ToList());
            }
            catch (Exception)
            {
                throw;
            }
            finally
            {
                contexto.Dispose();
            }
        }