using System;

public class Program

{

    public static void Main()

    {

        var utc = new DateTimeOffset(2018, 1, 31, 0, 0, 0, TimeSpan.Zero);

        var aest = TimeZoneInfo.FindSystemTimeZoneById("AUS Eastern Standard Time");

        var local = TimeZoneInfo.ConvertTime(utc, aest);

        Console.WriteLine(utc.ToString("o"));

        Console.WriteLine(local.ToString("o"));

    }

}