Question

As the title says, given the year and the week number, how do I get the month number?

edit: if a week crosses two months, I want the month the first day of the week is in.

edit(2): This is how I get the week number:

CultureInfo.CurrentCulture.Calendar.GetWeekOfYear(DateTime.Now, CalendarWeekRule.FirstDay, DayOfWeek.Monday); 

I’m just trying to do the reverse.

Answer 1

This is what I ended up doing:

static int GetMonth(int Year, int Week) {     DateTime tDt = new DateTime(Year, 1, 1);      tDt.AddDays((Week - 1) * 7);      for (int i = 0; i <= 365; ++i)     {         int tWeek = CultureInfo.CurrentCulture.Calendar.GetWeekOfYear(             tDt,              CalendarWeekRule.FirstDay,              DayOfWeek.Monday);         if (tWeek == Week)             return tDt.Month;          tDt = tDt.AddDays(1);     }     return 0; } 

I would have preferred something simpler, but it works 🙂