using System;

using System.Collections.Generic;

using System.Collections;

using System.Linq;

public class Program

{

    public static void Main()

    {

        var timeZones = TimeZoneInfo.GetSystemTimeZones();

        string[] expectedZoneIDs = {"UTC", "GMT Standard Time", "Greenwich Standard Time"};

        foreach (var timeZone in timeZones)  

        {  

            var zoneId = timeZone.Id;

            if(expectedZoneIDs.Contains(zoneId))

            {

                var dateTime = DateTime.Now;  

                var timeZoneInfo = TimeZoneInfo.FindSystemTimeZoneById(zoneId);  

                var dateTimeByZoneId = TimeZoneInfo.ConvertTime(dateTime, TimeZoneInfo.Local, timeZoneInfo);  

                var dateTimeFromUTC = TimeZoneInfo.ConvertTimeFromUtc(DateTime.UtcNow, timeZoneInfo);  

                var isDaylightSavings = timeZoneInfo.IsDaylightSavingTime(dateTimeByZoneId);

                var isDaylightSavingsUTC = timeZoneInfo.IsDaylightSavingTime(dateTimeFromUTC);

                Console.WriteLine("Zone : {0} DateTimeUTC: {1}", zoneId, dateTime); 

                Console.WriteLine("DateTimeFromLocal: {0} isDaylightSaving: {1}", dateTimeByZoneId, isDaylightSavings); 

                Console.WriteLine("DateTimeFromUTC: {0} isDaylightSavingUTC: {1}", dateTimeFromUTC, isDaylightSavingsUTC); 

                Console.WriteLine(""); 

            }

        }  

    }

}