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GetWeekOfYear varies depending on the FirstDayOfWeek and the CalendarWeekRule used

//If the specified date is the last day of the year, GetWeekOfYear returns the total number of weeks in that year. using System; using System.Globalization; public class SamplesCalendar  {    public static void Main()  {       CultureInfo myCI = new CultureInfo("en-US");       Calendar myCal = myCI.Calendar;       CalendarWeekRule myCWR = myCI.DateTimeFormat.CalendarWeekRule;       DayOfWeek myFirstDOW = myCI.DateTimeFormat.FirstDayOfWeek;       Console.WriteLine( "The CalendarWeekRule used for the en-US culture is {0}.", myCWR );       Console.WriteLine( "The FirstDayOfWeek used for the en-US culture is {0}.", myFirstDOW );       Console.WriteLine(myCal.GetWeekOfYear( DateTime.Now, myCWR, myFirstDOW ));       DateTime LastDay = new System.DateTime( DateTime.Now.Year, 12, 31 );       Console.WriteLine( "There are {0} weeks in the current year ({1}).", myCal.GetWeekOfYear( LastDay, myCWR, myFirstDOW ), LastDay.Year );    } }