var dateString1 = DateTime.Now.ToString("yyyyMMdd"); var dateString2 = DateTime.Now.ToString("yyyy-MM-dd"); Console.WriteLine("yyyyMMdd " + dateString1); Console.WriteLine("yyyy-MM-dd "+ dateString2);
DateTime dt = DateTime.ParseExact(dateString, "ddMMyyyy", CultureInfo.InvariantCulture); dt.ToString("yyyyMMdd");