.NET: Unix Date Functions, Timestamps, Start of Day, etc

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public static DateTime UnixTimeStampToDateTime(long unixTimeStamp)
{
	// Unix timestamp is seconds past epoch
	DateTime dateTime = new DateTime(1970, 1, 1, 0, 0, 0, 0, DateTimeKind.Utc);
	dateTime = dateTime.AddSeconds(unixTimeStamp);

	return dateTime;
}


public static long UnixTimeStamp()
{
	return UnixTimeStamp(DateTime.UtcNow);
}


public static long UnixTimeStamp(DateTime dt)
{
	return new DateTimeOffset(dt).ToUnixTimeSeconds();
}


public static DateTime UTCStartOfDay()
{
	var utc_date = new DateTime(DateTime.UtcNow.Year, DateTime.UtcNow.Month, DateTime.UtcNow.Day, 0, 0, 0, DateTimeKind.Utc);
            return utc_date;
}