Błąd zmiany daty
DateTime.ParseExact(myDateString, "yyyyMMdd", CultureInfo.InvariantCulture, DateTimeStyles.None);
MOHAMMED EL HMAM
DateTime.ParseExact(myDateString, "yyyyMMdd", CultureInfo.InvariantCulture, DateTimeStyles.None);DateTime.ParseExact(myDateString, "yyyyMMdd", CultureInfo.InvariantCulture, DateTimeStyles.None);DateTime.ParseExact(myDateString, "yyyyMMdd", CultureInfo.InvariantCulture, DateTimeStyles.None);