get date by week number and week day

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how can find any date by specify week number of month and week day...

Example...

If i want

What is the date every month on third Thursday

so it should reply...

17/11/2011
15/11/2011
19/1/2012
16/2/2012

how can i achieve this please help....

i am able to do this

C#

DateTime dt = DateTime.Today;
   CultureInfo ciCurr = CultureInfo.CurrentCulture;
   int weekNum = ciCurr.Calendar.GetWeekOfYear(dt, CalendarWeekRule.FirstFullWeek, DayOfWeek.Monday);
   weekNum = weekNum / 12;
   string weekday = dt.DayOfWeek.ToString();

i am able to get week number and week day of any date.....

but now i want to find date by given week number and week day....

Posted 16-Nov-11 19:11pm

dilip.aim11

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vinoth kumar rajendran · Answer 1 · 2011-11-16T19:27:00

to add an extension method called WeekNumber for a DateTime instance here is the code:

C#

public static class DateTimeExtensions
{
    public static int WeekNumber(this System.DateTime value)
    {
        return CultureInfo.CurrentCulture.Calendar.GetWeekOfYear(value,CalendarWeekRule.FirstFourDayWeek,DayOfWeek.Monday);
 
    }
}

Anurag Gandhi · Answer 2 · 2011-11-16T19:54:00

Thanks for comment. I updated it.
You the following method:

C#

private List<datetime> GetDateByWeek(DateTime startDate, int weekNumOfMonth, int dayOfWeek)
    {
        List<datetime> dates = new List<datetime>();
        DateTime dt = new DateTime(startDate.Year, startDate.Month, 1);

        for (int i = 0; i < 5; i++)
        {
            int day = (weekNumOfMonth - 1) * 7 - 1 + dayOfWeek - (int)dt.DayOfWeek;
            dates.Add(dt.AddDays(day >= 0 ? day : day + 7));
            dt = dt.AddMonths(1);
        }
        return dates;
    }</datetime></datetime></datetime>

To use this, for example for third week, thursday, just call like this:

List<DateTime> myDates = GetDateByWeek(DateTime.Now, 3, 5);

get date by week number and week day

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