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Datumsberechnung

A01.cs
using System;
using System.Text;

public class Test {

  static void Main(string[] arg) {
    foreach (string s in arg) {
      Console.Write(s);
      if (s.Length == 10 && s[2] == '/' && s[5] == '/') {
        StringBuilder buf = new StringBuilder();
        buf.Append(s.Substring(3, 2));
        buf.Append('.');
        buf.Append(s.Substring(0, 2));
        buf.Append('.');
        buf.Append(s.Substring(6, 4));
        Console.WriteLine(": " + buf.ToString());
      } else Console.WriteLine(": invalid format");
    }
  }
}