How to get the current date when i pass the parameter as week and year

Heres the logic:
1. Find out the Day of Week of Jan 1 of the year (Sunday or Monday etc......)
2. Based on results from step 1, determine the first Sunday of the year.
3. If Jan 1st itself is a Sunday, that becomes the first week, else it is the second week.
4. Use results from step 3 to determine the days for any specific week # using the fact that a week has 7 days.

Try:

private static DateTime GetDateFromWeek(int year, int weekOfYear)
   {
   DateTime jan1 = new DateTime(year, 1, 1);
   int daysOffset = (int)CultureInfo.CurrentCulture.DateTimeFormat.FirstDayOfWeek - (int)jan1.DayOfWeek;
   DateTime firstMonday = jan1.AddDays(daysOffset);
   int firstWeek = CultureInfo.CurrentCulture.Calendar.GetWeekOfYear(jan1, CultureInfo.CurrentCulture.DateTimeFormat.CalendarWeekRule, CultureInfo.CurrentCulture.DateTimeFormat.FirstDayOfWeek);
   if (firstWeek <= 1)
      {
      weekOfYear -= 1;
      }
   return firstMonday.AddDays(weekOfYear * 7);
   }

Can't remember where I got it, but there you go...

Use System.DateTime. Take a first day of the year for initial value, by number of week calculate number of days (multiply by 7 minus one) and use System.DateTime.AddDays. See http://msdn.microsoft.com/en-us/library/system.datetime.aspx[^].

—SA

Define a function as:

private DateTime GetDateByWeekAndYear(int year, int WeekNo)
       {
           DateTime dt = new DateTime(year, 1, 1); //initialize date to 1-jan-year
           CultureInfo ci = CultureInfo.CurrentCulture;
           dt = ci.Calendar.AddWeeks(dt, WeekNo); // Add required no of weeks
           return dt;

       }

Call the method by passing year and week no

DateTime dt =  GetDateByWeekAndYear(2011,25);

Here is the another way to implement the method:

private DateTime GetDateByWeekAndYear(int year, int WeekNo)
        {
            DateTime dt = new DateTime(year, 1, 1); //initialize date to 1-jan-year

            while (dt.DayOfWeek != DayOfWeek.Monday)
            {
                dt = dt.AddDays(1); //complete the first week till sunday, this is first week
            }
            dt = dt.AddDays((WeekNo - 2) * 7); //Already date is incremented till first week, add 7*(WeekNo - 2) to get 1st day of that week

            return dt;
        }