Display Time Threads

using System;
using System.Threading;

namespace DisplayTime
{
    class StartUp
    {
        static void Main(string[] args)
        {
            const int frequency = 3000;
            int offset = 0;

            var DisplayTimeThread = new Thread(() =>
            {
                try
                {
                    Thread.CurrentThread.IsBackground = true;
                    while (true)
                    {
                        DisplayTime(offset);
                        Thread.Sleep(frequency);
                    }
                }
                catch (Exception e)
                {
                    //Send a detailed message to an error handler;
                }
            });

            DisplayTimeThread.Priority = ThreadPriority.Normal;
            DisplayTimeThread.Start();
            ShowMenu();
            GetOffsetFromUser(ref offset);

        }

        private static int GetOffsetFromUser(ref int offset)
        {
            while (true)
            {
                switch (Console.ReadKey().Key)
                {
                    case ConsoleKey.UpArrow:
                        offset++;
                        break;
                    case ConsoleKey.DownArrow:
                        offset--;
                        break;
                    case ConsoleKey.Escape:
                        Environment.Exit(0);
                        break;
                }
            }
        }

        static void DisplayTime(int offset)
        {
            Console.WriteLine(DateTime.UtcNow.AddHours(offset).ToString("hh:mm:ss"));
        }

        static void ShowMenu()
        {
            Console.WriteLine("Press Up to Increase by one Hour!");
            Console.WriteLine("Press Down to Decrease by one Hour!");
            Console.WriteLine("Press Esc to Exit!");
        }
    }
}