获得当前日期是今年的第几周？

Question

TimeZone zone=TimeZone.getTimeZone("Asia/Shanghai");
Calendar cal = Calendar.getInstance(zone);
int c = cal.get(cal.WEEK_OF_YEAR);
System.out.println(c);
现在应该是第24周，为什么输出25？

Answer 1

private static int GetWeekOfYear(DateTime dt)
{
    CultureInfo myCI = new CultureInfo("zh-CN");
    System.Globalization.Calendar myCal = myCI.Calendar;
    CalendarWeekRule myCWR = myCI.DateTimeFormat.CalendarWeekRule;
    DayOfWeek myFirstDOW = myCI.DateTimeFormat.FirstDayOfWeek;
    return myCal.GetWeekOfYear(dt, myCWR, myFirstDOW);
}
private static int GetWeekOfYear(string str)
{
        DateTime time = new DateTime();
        time = DateTime.Parse(str);
        GregorianCalendar gc = new GregorianCalendar();
        int weekOfYear = gc.GetWeekOfYear(time,CalendarWeekRule.FirstDay, DayOfWeek.Sunday);
}

Answer 2

好像在日期方面都要减一吧Calendar calendar = Calendar.getInstance(); 
int weekOfYear=calender.get(Calendar.WEEK_OF_YEAR); 

Answer 3

Month需要加一，其他不需要操作
25周是正确的，楼主提了一个错误的问题

Answer 4

为什么我在ubuntu下显示的第24周 
还有对于mysql数据库 我select week(now());显示的也是24？

Answer 5

24是从零开始。
Calendar calendar = Calendar.getInstance(TimeZone.getTimeZone("Asia/Chongqing"));
calendar.set(2010,0,1);
System.out.println(calendar.get(Calendar.WEEK_OF_YEAR)); // 1

Answer 6

赞成楼上说法
http://topic.csdn.net/u/20100611/10/156d72cf-516c-42d0-9565-f403ce785383.html

Answer 7

System.out.println(Calendar.getInstance().get(Calendar.WEEK_OF_YEAR));25..
为什么？
25对还是24对？

Answer 8

SimpleDateFormat sdfyyyyMMdd = new SimpleDateFormat("yyyy-MM-dd");
Date date = sdfyyyyMMdd.parse("2010-01-01");
Calendar c1 = Calendar.getInstance();
c1.setTimeInMillis(date.getTime());
System.out.println(date.getTime() == c1.getTimeInMillis());
System.out.println(c1.get(Calendar.WEEK_OF_YEAR));25应该不会错，吓一跳以为出问题了，今天还用Calendar 

Answer 9

Calendar calendar = Calendar.getInstance(); 
int weekOfYear=calender.get(Calendar.WEEK_OF_YEAR);