Convert US date to EU date in C# project?

Question

using System;
using System.Globalization;

public class Example
{
public static void Main()
{
string dateString, format;
DateTime result;
CultureInfo provider = CultureInfo.InvariantCulture;
// Parse date-only value with invariant culture.
dateString = "11/25/2019";
format = "d";
try {
result = DateTime.ParseExact(dateString, format, provider);
Console.WriteLine("{0} converts to {1}.", dateString, result.ToString());
}
catch (FormatException) {
Console.WriteLine("{0} is not in the correct format.", dateString);
}
// Parse date-only value without leading zero in month using "d" format.
// Should throw a FormatException because standard short date pattern of
// invariant culture requires two-digit month.
dateString = "11/25/2019";
try {
result = DateTime.ParseExact(dateString, format, provider);
Console.WriteLine("{0} converts to {1}.", dateString, result.ToString());

Answer 1

What is wrong of this codes in C# that are not an acceptable answer to the related project?