Java tutorial
import java.text.DateFormat; import java.util.Calendar; import java.util.SimpleTimeZone; public class Test { public static void main(String[] args) { Calendar calendar = Calendar.getInstance(); if (calendar.isWeekDateSupported()) { System.out.println("Number of weeks in this year: " + calendar.getWeeksInWeekYear()); System.out.println("Current week number: " + calendar.get(Calendar.WEEK_OF_YEAR)); } calendar.setWeekDate(2012, 16, 3); System.out.println( DateFormat.getDateTimeInstance(DateFormat.LONG, DateFormat.LONG).format(calendar.getTime())); } }