using System;

using System.Globalization;

using System.Linq;

​

public class Program

{

​

    public static void Main()

    {   

        var dateTime=new DateTime(2023,9,21);

        Console.WriteLine(dateTime.ToString(CultureInfo.InvariantCulture));

        var cults=CultureInfo.GetCultures(CultureTypes.AllCultures)

            .Where(ci=>dateTime.ToString("dd-MMM-yyyy",ci)=="21-Sept-2023");

        foreach(var cult in cults)

        {

            Console.WriteLine("{0} {1}",cult.Name,cult.DisplayName);

        }

    }

}