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

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

fully tested:

for (int mo = 1; mo <= 12; mo++)
{
    DateTime _date = new DateTime(yr, mo, 1);
    DayOfWeek day = _date.DayOfWeek;

    int d = 0;
    if (day == DayOfWeek.Saturday)
        d += 7;

    var diff = DayOfWeek.Friday - day;

    DateTime secFriday = _date.AddDays(diff + 7 + d);
    Console.WriteLine(secFriday.ToString("MM\tffffd\tdd"));
}  

Final results:

Month           Date
=====================
01      Fri     14
02      Fri     11
03      Fri     11
04      Fri     08
05      Fri     13
06      Fri     10
07      Fri     08
08      Fri     12
09      Fri     09
10      Fri     14
11      Fri     11
12      Fri     09

Answer 3

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;
    }

Answer 4

Untested, but this should grab it.

DateTime today = DateTime.Today;
DateTime secondFriday = 
     Enumerable.Range(8, 7)
               .Select(item => new DateTime(today.Year, today.Month, item))
               .Where(date => date.DayOfWeek == DayOfWeek.Friday)
               .Single();