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  1. using System;
  2.  
  3. public class Program {
  4. 	public static void Main() {
  5. 		Console.WriteLine((new DateTime(2016, 06, 13)).BusinessDaysUntil(DateTime.Now));
  6. 	}
  7. }
  8. public static class DateExt {
  9. 	public static int BusinessDaysUntil(this DateTime firstDay, DateTime lastDay, params DateTime[] bankHolidays) {
  10. 		firstDay = firstDay.Date;
  11. 		lastDay = lastDay.Date;
  12. 		if (firstDay > lastDay)	throw new ArgumentException("Incorrect last day " + lastDay);
  13. 		TimeSpan span = lastDay - firstDay;
  14. 		int businessDays = span.Days + 1;
  15. 		int fullWeekCount = businessDays / 7;
  16. 		// find out if there are weekends during the time exceedng the full weeks
  17. 		if (businessDays > fullWeekCount*7) {
  18. 			// we are here to find out if there is a 1-day or 2-days weekend
  19. 			// in the time interval remaining after subtracting the complete weeks
  20. 			int firstDayOfWeek = (int) firstDay.DayOfWeek;
  21. 			int lastDayOfWeek = (int) lastDay.DayOfWeek;
  22. 			if (lastDayOfWeek < firstDayOfWeek)
  23. 				lastDayOfWeek += 7;
  24. 			if (firstDayOfWeek <= 6) {
  25. 				if (lastDayOfWeek >= 7)// Both Saturday and Sunday are in the remaining time interval
  26. 					businessDays -= 2;
  27. 				else if (lastDayOfWeek >= 6)// Only Saturday is in the remaining time interval
  28. 					businessDays -= 1;
  29. 			}
  30. 			else if (firstDayOfWeek <= 7 && lastDayOfWeek >= 7)// Only Sunday is in the remaining time interval
  31. 				businessDays -= 1;
  32. 		}
  33. 		// subtract the weekends during the full weeks in the interval
  34. 		businessDays -= fullWeekCount + fullWeekCount;
  35. 		// subtract the number of bank holidays during the time interval
  36. 		foreach (DateTime bankHoliday in bankHolidays) {
  37. 			DateTime bh = bankHoliday.Date;
  38. 			if (firstDay <= bh && bh <= lastDay) --businessDays;
  39. 		}
  40. 		return businessDays;
  41. 	}
  42. }
  43.  
  44. //https://pt.stackoverflow.com/q/134961/101
Success #stdin #stdout 0.03s 17876KB
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stdin 
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https://ideone.com/L0x34g
language:
C# (gmcs 5.20.1)
created:
4 years ago
visibility:
public

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