How to calculate 2nd Friday of Month in C# [duplicate]

Question

Possible Duplicate:
How to find the 3rd Friday in a month with C#?

Hi everyone,

I've wrote a little console utility that spits out a line into a text file. I want this line to include the second Friday of the current month. Is there any way to do this?

Thanks everyone!

Answer 1

Slight variation on @druttka: using an extension method.

 public static DateTime NthOf(this DateTime CurDate, int Occurrence , DayOfWeek Day)
 {
     var fday = new DateTime(CurDate.Year, CurDate.Month, 1);

     var fOc = fday.DayOfWeek == Day ? fday : fday.AddDays(Day - fday.DayOfWeek);
     // CurDate = 2011.10.1 Occurance = 1, Day = Friday >> 2011.09.30 FIX. 
     if (fOc.Month < CurDate.Month) Occurrence = Occurrence+1;
     return fOc.AddDays(7 * (Occurrence - 1));
 }

Then called it like this:

 for (int i = 1; i < 13; i++)
 {
      Console.WriteLine(new DateTime(2011, i,1).NthOf(2, DayOfWeek.Friday));
 }

Answer 2

I would go for something like this.

    public static DateTime SecondFriday(DateTime currentMonth)
    {
        var day = new DateTime(currentMonth.Year, currentMonth.Month, 1);
        day = FindNext(DayOfWeek.Friday, day);
        day = FindNext(DayOfWeek.Friday, day.AddDays(1));
        return day;
    }

    private static DateTime FindNext(DayOfWeek dayOfWeek, DateTime after)
    {
        DateTime day = after;
        while (day.DayOfWeek != dayOfWeek) day = day.AddDays(1);
        return day;
    }