using System;

using System.Globalization;

using NodaTime;

public class Program

{

    public static void Main()

    {       

        var ts = "2023-09-21T13:53:00Z";

                var ts2 = "26/09/2023 13:47";

        var dt = DateTime.Parse(ts);

        var dt2 = dt.ToUniversalTime();

                Console.WriteLine(dt);

                        Console.WriteLine(dt2);

                                Console.WriteLine(dt2.ToLocalTime());

        Console.WriteLine("Hello World");

 /*     

        DateTime.TryParseExact(ts2,"dd/MM/yyyy HH:mm",  CultureInfo.InvariantCulture, 

                   DateTimeStyles.AssumeUniversal | DateTimeStyles.AdjustToUniversal, out var startDate);

​

        DateTime convertedDate = DateTime.SpecifyKind(

                        startDate,

                        DateTimeKind.Local);

        DateTime dt3 = convertedDate.ToLocalTime();

                            Console.WriteLine(dt3.ToString("O"));

                    var dateTime = startDate.AddHours(-1);

                    Console.WriteLine(dateTime.ToLocalTime().ToString("O"));

        var dateTimeSpecifyKind = DateTime.SpecifyKind(dateTime, DateTimeKind.Utc);

         Console.WriteLine(dateTimeSpecifyKind.ToUniversalTime().ToString("O"));

        var timeZoneInfoConvertTimeToUtc = TimeZoneInfo.ConvertTimeToUtc(dateTime);

                 Console.WriteLine(timeZoneInfoConvertTimeToUtc.ToString("O")); */

                        DateTime.TryParseExact(ts2, "dd/MM/yyyy HH:mm", null, DateTimeStyles.AssumeUniversal, out var startDate2);

​

                var date = startDate2.ToUniversalTime();

                var time = Instant.FromDateTimeUtc(date.AddHours(-2));

                var zone = DateTimeZoneProviders.Tzdb["Europe/London"];

                var zonedTime = time.InZone(zone).ToDateTimeOffset();

​

                 Console.WriteLine(zonedTime.ToString("O"));

    }

}