using System;

using System.Globalization;

public class Program

{

    private static string[] _dateFormats = { "dd/MM/yyyy", "dd/M/yyyy", "d/MM/yyyy" };

    public static void Main()

    {

        Console.WriteLine(Format("12.4.1956"));

    }

    public static string Format(string value) // TODO Make it scalable. Same code exists on ExternalTable project

    {

        if (string.IsNullOrEmpty(value)) return string.Empty;

        var transformed = value.Replace(".", "/").Replace("-", "/").Replace(",", "/");

        if (DateTime.TryParseExact(transformed, _dateFormats, null, DateTimeStyles.None, out var parsedDate))

        {

            return parsedDate.ToString("dd/MM/yyyy");

        }

        else

        {

            throw new Exception("DateFormat invalid");

        }

    }

}

​

​