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I need to find 2 elegant complete implementations of public static DateTime AddBusinessDays(this DateTime date, int days) { // code here } and public static int GetBusinessDays(this DateTime start, DateTime end) { // code here } O(1) preferable (no loops). EDIT: By business days i mean working days (Monday, Tuesday, Wednesday, Thursday, Friday). No holidays, just weekends excluded. I already have some ugly solutions that seem to work but i wonder if there are elegant ways to do this. Thanks This is what i've written so far. It works in all cases and does negatives too. Still need a GetBusinessDays implementation public static DateTime AddBusinessDays(this DateTime startDate, int businessDays) { int direction = Math.Sign(businessDays); if(direction == 1) { if(startDate.DayOfWeek == DayOfWeek.Saturday) { startDate = startDate.AddDays(2); businessDays = businessDays - 1; } else if(startDate.DayOfWeek == DayOfWeek.Sunday) { startDate = startDate.AddDays(1); businessDays = businessDays - 1; } } else { if(startDate.DayOfWeek == DayOfWeek.Saturday) { startDate = startDate.AddDays(-1); businessDays = businessDays + 1; } else if(startDate.DayOfWeek == DayOfWeek.Sunday) { startDate = startDate.AddDays(-2); businessDays = businessDays + 1; } } int initialDayOfWeek = (int)startDate.DayOfWeek; int weeksBase = Math.Abs(businessDays / 5); int addDays = Math.Abs(businessDays % 5); if((direction == 1 && addDays + initialDayOfWeek > 5) || (direction == -1 && addDays >= initialDayOfWeek)) { addDays += 2; } int totalDays = (weeksBase * 7) + addDays; return startDate.

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