DateTime ConvertDate  = Convert.ToDateTime(DateTime.ParseExact(item.Key, "yyyyMMdd", null, System.Globalization.DateTimeStyles.AllowWhiteSpaces).ToString("yyyy-MM-dd"));

 DateTime.ParseExact("18/05/2014", "dd/MM/yyyy", System.Globalization.CultureInfo.GetCultureInfo("en-US")).ToString("yyyy-MM-dd") ;

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