2013-12-31 and 2014-1-1 should both be CW1, 2014, but aren't. Happens in .NET 2.0 and 4.0

calendarweek.cs

public void WrongCalendarWeekCalculation()
{
  var calendar = new System.Globalization.CultureInfo("en-US").Calendar;
            
  var m1 = calendar.GetWeekOfYear(new DateTime(2013, 12, 31), System.Globalization.CalendarWeekRule.FirstFourDayWeek, DayOfWeek.Monday);
  var m2 = calendar.GetWeekOfYear(new DateTime(2014, 1, 1), System.Globalization.CalendarWeekRule.FirstFourDayWeek, DayOfWeek.Monday);

  Console.Write("m1= {0}; m2= {1}", m1, m2); //> m1= 53; m2= 1;
}