Tiempo Local - Universal

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace TiempoLocalUniversal
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void button1_Click(object sender, EventArgs e)
        {
            Application.Exit();
        }

        private void Form1_Load(object sender, EventArgs e)
        {

            TimeZone zona = TimeZone.CurrentTimeZone;
            DateTime local = zona.ToLocalTime(DateTime.Now);
            label1.Text = "La hora local es: "+ local.ToString();
            DateTime universal = zona.ToUniversalTime(DateTime.Now);
            label2.Text = "La hora Universal es: " + universal.ToString();
       


            TimeZoneInfo localzona = TimeZoneInfo.Local;
            label3.Text = "La Zona horaria actual es: " + localzona.DisplayName +"\r\n";
            label4.Text = "Estas " + Math.Abs(localzona.BaseUtcOffset.Hours) + " hora y "
             + Math.Abs(localzona.BaseUtcOffset.Minutes) + " minutos " + "\r\n";
            label5.Text = (localzona.BaseUtcOffset >= TimeSpan.Zero) ? "por delante de UTC" : "por detras de UTC";
       
            foreach (TimeZoneInfo z in TimeZoneInfo.GetSystemTimeZones())
            {
                textBox2.AppendText(z.ToString()+"\r\n");
            }
        }
    }
}

https://msdn.microsoft.com/es-es/library/system.datetime.tolocaltime(v=vs.110).aspx

https://msdn.microsoft.com/es-es/library/system.timezone.tolocaltime(v=vs.110).aspx

https://msdn.microsoft.com/es-es/library/system.datetime.touniversaltime(v=vs.110).aspx