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copied!<p>I wrote a type extender to allow me to add (or subtract) weekdays to a given date. Maybe this will help you. Works great, so please vote for my post if this helped you.</p> <pre><code> /// <summary> /// Adds weekdays to date /// </summary> /// <param name="value">DateTime to add to</param> /// <param name="weekdays">Number of weekdays to add</param> /// <returns>DateTime</returns> public static DateTime AddWeekdays(this DateTime value, int weekdays) { int direction = Math.Sign(weekdays); int initialDayOfWeek = Convert.ToInt32(value.DayOfWeek); //--------------------------------------------------------------------------- // if the day is a weekend, shift to the next weekday before calculating if ((value.DayOfWeek == DayOfWeek.Sunday && direction < 0) || (value.DayOfWeek == DayOfWeek.Saturday && direction > 0)) { value = value.AddDays(direction * 2); weekdays += (direction * -1); // adjust days to add by one } else if ((value.DayOfWeek == DayOfWeek.Sunday && direction > 0) || (value.DayOfWeek == DayOfWeek.Saturday && direction < 0)) { value = value.AddDays(direction); weekdays += (direction * -1); // adjust days to add by one } //--------------------------------------------------------------------------- int weeksBase = Math.Abs(weekdays / 5); int addDays = Math.Abs(weekdays % 5); int totalDays = (weeksBase * 7) + addDays; DateTime result = value.AddDays(totalDays * direction); //--------------------------------------------------------------------------- // if the result is a weekend, shift to the next weekday if ((result.DayOfWeek == DayOfWeek.Sunday && direction > 0) || (result.DayOfWeek == DayOfWeek.Saturday && direction < 0)) { result = result.AddDays(direction); } else if ((result.DayOfWeek == DayOfWeek.Sunday && direction < 0) || (result.DayOfWeek == DayOfWeek.Saturday && direction > 0)) { result = result.AddDays(direction * 2); } //--------------------------------------------------------------------------- return result; } </code></pre>

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