Convert datetime to timestamp and timestamp to datetime in C#

	public static readonly DateTime EpochUtc = new DateTime(1970, 1, 1, 0, 0, 0, DateTimeKind.Utc);
	public static long ConvertDatetime2Timestamp(DateTime value)
	{
	TimeSpan elapsedTime = value - EpochUtc;
	return (long)elapsedTime.TotalSeconds;
	}
	public static DateTime ConvertTimestamp2Datetime(double timestampMilisec)
	{
	DateTime dateTime = DateTime.SpecifyKind(EpochUtc, DateTimeKind.Utc);
	return dateTime.AddSeconds(timestampMilisec);
	}

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