Proof of windows handling timezones and transitions between standard time and daylight savings time

TimeZonePoC.cs

Console.WriteLine("NOW: " + DateTime.UtcNow);

var timesOfYear = new List<Tuple<string, DateTime>>
{
	Tuple.Create("Today (now)", DateTime.UtcNow),
	Tuple.Create("Calgary Summer", new DateTime(2018, 6, 27, 14, 30, 0).ToUniversalTime()),
	Tuple.Create("Calgary Winter", new DateTime(2018, 11, 21, 14, 00, 0).ToUniversalTime()),
	Tuple.Create("In between DST", new DateTime(2018, 3, 19, 14, 30, 0).ToUniversalTime()),
	Tuple.Create("Sydney/London crossover", new DateTime(2018, 3, 28, 07, 30, 0).ToUniversalTime()) // London still on GMT, Sydney in DST
};

foreach (var timeOfYear in timesOfYear)
{
	Console.WriteLine($"\r\n==={timeOfYear.Item1} (UTC: {timeOfYear.Item2})===");
	DateTime calgaryTime = TimeZoneInfo.ConvertTimeBySystemTimeZoneId(timeOfYear.Item2, "Mountain Standard Time");
	DateTime londonTime = TimeZoneInfo.ConvertTimeBySystemTimeZoneId(timeOfYear.Item2, "GMT Standard Time");
	DateTime dubaiTime = TimeZoneInfo.ConvertTimeBySystemTimeZoneId(timeOfYear.Item2, "Arab Standard Time");
	DateTime sydneyTime = TimeZoneInfo.ConvertTimeBySystemTimeZoneId(timeOfYear.Item2, "AUS Eastern Standard Time");

	Console.WriteLine($"CALGARY TIME: {calgaryTime}");
	Console.WriteLine($"LONDON TIME: {londonTime}");
	Console.WriteLine($"DUBAI TIME: {dubaiTime}");
	Console.WriteLine($"SYDNEY TIME: {sydneyTime}");
}