using System;

using System.Linq;

using System.Globalization;

public class Program

{

    public static void Main()

    {

      DateTimeFormatInfo dateFormats = CultureInfo.CurrentCulture.DateTimeFormat;

        var tzs = TimeZoneInfo.GetSystemTimeZones();

        var timeZone = tzs.FirstOrDefault(x=>x.Id == "GMT Standard Time");

        bool hasDST = timeZone.SupportsDaylightSavingTime;

TimeSpan offsetFromUtc = timeZone.BaseUtcOffset;

TimeZoneInfo.AdjustmentRule[] adjustRules;

string offsetString;

​

Console.WriteLine("ID: {0}", timeZone.Id);

Console.WriteLine("   Display Name: {0, 40}", timeZone.DisplayName);

Console.WriteLine("   Standard Name: {0, 39}", timeZone.StandardName);

Console.Write("   Daylight Name: {0, 39}", timeZone.DaylightName);

Console.Write(hasDST ? "   ***Has " : "   ***Does Not Have ");

Console.WriteLine("Daylight Saving Time***");

offsetString = String.Format("{0} hours, {1} minutes", offsetFromUtc.Hours, offsetFromUtc.Minutes);

Console.WriteLine("   Offset from UTC: {0, 40}", offsetString);

adjustRules = timeZone.GetAdjustmentRules();

Console.WriteLine("   Number of adjustment rules: {0, 26}", adjustRules.Length);  

if (adjustRules.Length > 0)

{

Console.WriteLine("   Adjustment Rules:");

foreach (TimeZoneInfo.AdjustmentRule rule in adjustRules)

{

   TimeZoneInfo.TransitionTime transTimeStart = rule.DaylightTransitionStart;

   TimeZoneInfo.TransitionTime transTimeEnd = rule.DaylightTransitionEnd; 

​

   Console.WriteLine("      From {0} to {1}", rule.DateStart, rule.DateEnd);

   Console.WriteLine("      Delta: {0}", rule.DaylightDelta);

   if (! transTimeStart.IsFixedDateRule)

   {

      Console.WriteLine("      Begins at {0:t} on {1} of week {2} of {3}", transTimeStart.TimeOfDay, 

                                                                    transTimeStart.DayOfWeek,                                                                                 

                                                                    transTimeStart.Week, 

                                                                    dateFormats.MonthNames[transTimeStart.Month - 1]);

      Console.WriteLine("      Ends at {0:t} on {1} of week {2} of {3}", transTimeEnd.TimeOfDay,

                                                                    transTimeEnd.DayOfWeek, 

                                                                    transTimeEnd.Week,

                                                                    dateFormats.MonthNames[transTimeEnd.Month - 1]);

   }

   else

   {

      Console.WriteLine("      Begins at {0:t} on {1} {2}", transTimeStart.TimeOfDay, 

                                                     transTimeStart.Day, 

                                                     dateFormats.MonthNames[transTimeStart.Month - 1]);

      Console.WriteLine("      Ends at {0:t} on {1} {2}", transTimeEnd.TimeOfDay, 

                                                   transTimeEnd.Day, 

                                                   dateFormats.MonthNames[transTimeEnd.Month - 1]);

   }

}

}    

        Console.WriteLine("Hello World");

    }

}