gistfile1.cs

public class LocalizableDateTime
	{
		private string _tzid;
		private TimeZoneInfo _tzi;
		private DateTime _utc;

		public string TimeZoneId
		{
			get { return _tzid; }
			
			private set
			{
				_tzi = TimeZoneInfo.FindSystemTimeZoneById(value);
				_tzid = value;
			}
		}

		public LocalizableDateTime()
			: this("GMT Standard Time")
		{
		}

		public LocalizableDateTime(string timezoneId)
		{
			TimeZoneId = timezoneId;
			_utc = DateTime.UtcNow;
		}

		public LocalizableDateTime(DateTime dt, string timezoneId)
		{
			TimeZoneId = timezoneId;
			_utc = dt.ToUniversalTime();
		}

		public override string ToString()
		{
			return _utc.ToString(CultureInfo.InvariantCulture);
		}

		public string ToString(string format)
		{
			return _utc.ToString(format);
		}

		public string ToLocalString(string format)
		{
			return ToLocalDateTime().ToString(format);
		}

		public string ToLocalString()
		{
			return ToLocalDateTime().ToString(CultureInfo.InvariantCulture);
		}

		public DateTime ToLocalDateTime()
		{
			return TimeZoneInfo.ConvertTimeFromUtc(_utc, _tzi);
		}
	}