Signum.Utilities.DateSpan.DateSpan C# (CSharp) Method

        public DateSpan(int years, int months, int days)
        {
            int sign = Math.Sign(years).DefaultToNull() ?? Math.Sign(months).DefaultToNull() ?? Math.Sign(days);

            if (0 < sign && (months < 0 || days < 0) ||
                sign < 0 && (0 < months || 0 < days))
                throw new ArgumentException("All arguments should have the same sign");

            this.Years = years;
            this.Months = months;
            this.Days = days;
        }