using System;

public class Program

{

    public static void Main()

    {

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

        var now = new DateTime(2016, 5, 17, 17, 0, 0, DateTimeKind.Local);

        var dtHere = new DateTimeWithZone(now, tz);

​

        Console.WriteLine("AU: {0} ---> GMT: {1}", dtHere.LocalTime, dtHere.UniversalTime);

    }

    public struct DateTimeWithZone

    {

        private readonly DateTime utcDateTime;

        private readonly TimeZoneInfo timeZone;

        public DateTimeWithZone(DateTime dateTime, TimeZoneInfo timeZone)

        {

            utcDateTime = TimeZoneInfo.ConvertTimeToUtc(DateTime.SpecifyKind(dateTime, DateTimeKind.Unspecified), timeZone); 

            this.timeZone = timeZone;

        }

        public DateTime UniversalTime { get { return utcDateTime; } }

        public TimeZoneInfo TimeZone { get { return timeZone; } }

        public DateTime LocalTime

        { 

            get 

            { 

                return TimeZoneInfo.ConvertTime(utcDateTime, timeZone); 

            }

        }        

    }

}