title: LocalDate from Week and WeekYear
body: <p>Using the NodaTime library, how can I calculate a LocalDate of the first day of the week based on a Week number and week WeekYear.</p>
  
  <p>The reverse of this:</p>
  
  <pre><code>var date = new LocalDate(2012, 1, 1);
  int weekYear = date.WeekYear;      // 2011
  int weekNr = date.WeekOfWeekYear;  // 52
  </code></pre>
  
  <p>Something like this fake code:</p>
  
  <pre><code>var newDate = LocalDate.FirstDayFromWeek(weekYear, weekNr);
  </code></pre>