Thursday, 7 July 2016

DateTime Extensions

public static class DateTimeExtensions
    {
        /// 
        /// Includes the from and to dates so from Monday to Tuesday it returns 2
        /// 
        public static int FindBusinessDaysUntil(this DateTime from, DateTime to)
        {
            double calcBusinessDays =
                1 + ((to - from).TotalDays * 5 -
                (from.DayOfWeek - to.DayOfWeek) * 2) / 7;

            if ((int)to.DayOfWeek == 6) calcBusinessDays--;
            if ((int)from.DayOfWeek == 0) calcBusinessDays--;

            return Convert.ToInt16(calcBusinessDays);
        }

        public static DateTime NextBusinessDay(this DateTime from)
        {
            var nextDay = from.AddDays(1);

            while (true)
            {
                var numberOfBusinessDays = FindBusinessDaysUntil(from, nextDay);

                if (numberOfBusinessDays == 2)
                {
                    return nextDay;
                }

                nextDay = nextDay.AddDays(1);
            }
        }

        public static DateTime NextBusinessDay(this DateTime from, int days)
        {
            var result = from;

            for (int i = 0; i < days; i++)
            {
                result = result.NextBusinessDay();
            }

            return result;
        }        
    }
}

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