Program.cs

using System;
using System.Threading;

namespace ConsoleApplication3 {
	class Program {
		static void Main(string[] args) {
			Thread.CurrentThread.CurrentCulture = new System.Globalization.CultureInfo("en-US");

			DateTime postedDk = new DateTime(2016, 12, 17, 6, 28, 0, DateTimeKind.Local);
			DateTime postedUtc = TimeZoneInfo.ConvertTime(postedDk, TimeZoneInfo.Local, TimeZoneInfo.Utc);
			DateTime postedMountain = TimeZoneInfo.ConvertTime(postedDk, TimeZoneInfo.Local, TimeZoneInfo.GetSystemTimeZones()[12]);

			TimeZoneInfo mountain = TimeZoneInfo.FindSystemTimeZoneById("Mountain Standard Time");

			Console.WriteLine($"Posted by me, in Denmark, at {postedDk.ToLongDateString()} {postedDk.ToLongTimeString()} local time");
			Console.WriteLine($"That's UTC: {postedUtc.ToLongDateString()} {postedUtc.ToLongTimeString()} UTC");
			Console.WriteLine($"And displays as {mountain.DisplayName} time: {postedMountain.ToLongDateString()} {postedMountain.ToLongTimeString()}");

			Console.ReadLine();
		}
	}
}