timeUtil

/**
     * 字符串的日期 格式 yyyy-MM-dd 转入参数，添加或减去它的天数，在返回字符串
     */
    public static String addOrDelRq(String rq, int num) throws Exception {
        SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
        Calendar c = Calendar.getInstance();
        c.setTime(sdf.parse(rq));
        c.add(Calendar.DATE, num);
        String rtn = sdf.format(c.getTime());
        return rtn;
    }

    // 获取当前时间所在年的周数
    public static int getWeekOfYear(Date date) {
        Calendar c = new GregorianCalendar();
        c.setFirstDayOfWeek(Calendar.MONDAY);
        c.setMinimalDaysInFirstWeek(7);
        c.setTime(date);

        return c.get(Calendar.WEEK_OF_YEAR);
    }

    // 获取当前时间所在年的最大周数
    public  static int getMaxWeekNumOfYear(int year) {
        Calendar c = new GregorianCalendar();
        c.set(year, Calendar.DECEMBER, 31, 23, 59, 59);

        return getWeekOfYear(c.getTime());
    }

    // 获取某年的第几周的开始日期
    public static Date getFirstDayOfWeek(int year, int week) {
        // week+=-1;
        Calendar c = new GregorianCalendar();
        c.set(Calendar.YEAR, year);
        c.set(Calendar.MONTH, Calendar.JANUARY);
        c.set(Calendar.DATE, 1);

        Calendar cal = (GregorianCalendar) c.clone();
        cal.add(Calendar.DATE, week * 7);
        cal.add(Calendar.DATE, -1);
        /*
         * //如果第一周有上一年的时间 if(week==1){
         * 
         * }
         */

        return getFirstDayOfWeek(cal.getTime());
    }

    // 获取某年的第几周的结束日期
    public static Date getLastDayOfWeek(int year, int week) {
        // week+=-1;
        Calendar c = new GregorianCalendar();
        c.set(Calendar.YEAR, year);
        c.set(Calendar.MONTH, Calendar.JANUARY);
        c.set(Calendar.DATE, 1);

        Calendar cal = (GregorianCalendar) c.clone();
        cal.add(Calendar.DATE, week * 7);
        cal.add(Calendar.DATE, -1);

        return getLastDayOfWeek(cal.getTime());
    }

    // 获取当前时间所在周的开始日期
    public static Date getFirstDayOfWeek(Date date) {
        Calendar c = new GregorianCalendar();
        c.setFirstDayOfWeek(Calendar.MONDAY);
        c.setTime(date);
        c.set(Calendar.DAY_OF_WEEK, c.getFirstDayOfWeek()); // Monday
        return c.getTime();
    }

    // 获取当前时间所在周的结束日期
    public static Date getLastDayOfWeek(Date date) {
        Calendar c = new GregorianCalendar();
        c.setFirstDayOfWeek(Calendar.MONDAY);
        c.setTime(date);
        c.set(Calendar.DAY_OF_WEEK, c.getFirstDayOfWeek() + 6); // Sunday
        return c.getTime();
    }