using System;

public class Program

{

    public static void Main()

    {           

        GetSystemTimeZoneInformation();

        // https://docs.microsoft.com/en-us/windows-hardware/manufacture/desktop/default-time-zones

        GetTimeZoneInformation("GMT Standard Time");        

        GetTimeZoneInformation("Greenwich Standard Time");

    }

    public static void GetSystemTimeZoneInformation()

    {

        Console.WriteLine("---------");

        // https://docs.microsoft.com/en-us/dotnet/api/system.datetime.now?view=net-5.0

        Console.WriteLine($"The current system time (influenced by the executing system's configuration): {DateTime.Now}");     

        Console.WriteLine($"The current time as UTC: {DateTime.UtcNow}");       

    }

    public static void GetTimeZoneInformation(string timeZoneName)

    {

        Console.WriteLine("---------");

        Console.WriteLine(timeZoneName);                        

        TimeZoneInfo timeZone = TimeZoneInfo.FindSystemTimeZoneById(timeZoneName);      

        Console.WriteLine($"UTC now is the following time in this zone: {TimeZoneInfo.ConvertTimeFromUtc(DateTime.UtcNow, timeZone)}");     

        Console.WriteLine($"Is this zone currently in daylight savings: {timeZone.IsDaylightSavingTime(DateTime.UtcNow)}");

        Console.WriteLine($"Daylight savings name: {timeZone.DaylightName}");       

    }

}