using System;

using NodaTime;

using NodaTime.Text;

public class Program

{

    public static void Main()

    {

        var pattern = ZonedDateTimePattern.CreateWithInvariantCulture("yyyy'-'MM'-'dd'T'HH':'mm':'sso<m>'['z']'", DateTimeZoneProviders.Tzdb);

        var result = pattern.Parse("2021-03-28T01:50:00+01:00[Europe/Berlin]");

        Console.WriteLine(result.Success);

        if (result.Success) Console.WriteLine(pattern.Format(result.Value));

        else Console.WriteLine(result.Exception.ToString());

    }

}