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using System;

using System.Runtime;

using System.Runtime.InteropServices;

using System.Web;

​

public class HelloWorld

{

    public static void Main(string[] args)

    {

        TimeZoneInfo tzInfo1 = System.TimeZoneInfo.FindSystemTimeZoneById("GMT Standard Time");

        TimeZoneInfo tzInfo2 = System.TimeZoneInfo.FindSystemTimeZoneById("Greenwich Standard Time");

        //TimeZoneInfo tzInfo3 = System.TimeZoneInfo.FindSystemTimeZoneById("Greenwich Mean Time");

        Console.WriteLine(tzInfo1);

        Console.WriteLine(tzInfo2);

        Console.WriteLine(tzInfo1.IsDaylightSavingTime(DateTime.Now));

        Console.WriteLine(tzInfo2.IsDaylightSavingTime(DateTime.Now));

        //Console.WriteLine(tzInfo3);

    }

}