java 日期 第几周-java 获取给定日期属于当年第几周

public static int getWeekDate(String date){
SimpleDateFormat format = new SimpleDateFormat(“yyyy-MM-dd”);
int weekOfYear;
try {
Date date1 = format.parse(date);
Calendar calendar = Calendar.getInstance();

        calendar.setFirstDayOfWeek(Calendar.MONDAY);

        calendar.setTime(date1);
        weekOfYear = calendar.get(Calendar.WEEK_OF_YEAR);

    }catch(ParseException e)
    {
        e.printStackTrace();
        return  0;
    }
    return weekOfYear;
    }

public static void main(String[] args) {
System.out.println(getWeekDate(“2022-01-01”));
System.out.println(getWeekDate(“2022-01-02”));
System.out.println(getWeekDate(“2022-01-03”));

    System.out.println(getWeekDate("2022-01-06"));

    System.out.println(getWeekDate("2022-01-08"));
    System.out.println(getWeekDate("2022-01-09"));
}

结果：
1
1
2
2
2
2

注意：setFirstDayOfWeek(int value) 设置起始日期