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2023-09-08 890d242d8b36aecd36c4a5f506384a08ea7b12a6

 java110-utils/src/main/java/com/java110/utils/util/DateUtil.java

@@ -495,6 +495,12 @@
        return maxDate;
    }

    public static int getMonthDay(Date date) {
        Calendar a = Calendar.getInstance();
        a.setTime(date);
        return a.getActualMaximum(Calendar.DAY_OF_MONTH);
    }

    public static void main(String[] args) throws ParseException {

//        SimpleDateFormat sf = new SimpleDateFormat(DateUtil.DATE_FORMATE_STRING_A);
@@ -673,60 +679,60 @@
        return Integer.parseInt(String.valueOf(between_days));
    }

    public static double dayCompare(Date fromDate, Date toDate) {
        double resMonth = 0.0;
        Calendar from = Calendar.getInstance();
        from.setTime(fromDate);
        Calendar to = Calendar.getInstance();
        to.setTime(toDate);
        //比较月份差 可能有整数 也会负数
        int result = to.get(Calendar.MONTH) - from.get(Calendar.MONTH);
        //比较年差
        int month = (to.get(Calendar.YEAR) - from.get(Calendar.YEAR)) * 12;

        //真实 相差月份
        result = result + month;

        //开始时间  2021-06-01  2021-08-05   result = 2    2021-08-01
        Calendar newFrom = Calendar.getInstance();
        newFrom.setTime(fromDate);
        newFrom.add(Calendar.MONTH, result);
        //如果加月份后 大于了当前时间 默认加 月份 -1 情况 12-19  21-01-10
        //这个是神的逻辑一定好好理解
        if (newFrom.getTime().getTime() > toDate.getTime()) {
            newFrom.setTime(fromDate);
            result = result - 1;
            newFrom.add(Calendar.MONTH, result);
        }

        // t1 2021-08-01   t2 2021-08-05
        long t1 = newFrom.getTime().getTime();
        long t2 = to.getTime().getTime();
        //相差毫秒
        double days = (t2 - t1) * 1.00 / (24 * 60 * 60 * 1000);
        BigDecimal tmpDays = new BigDecimal(days); //相差天数
        BigDecimal monthDay = null;
        Calendar newFromMaxDay = Calendar.getInstance();
        newFromMaxDay.set(newFrom.get(Calendar.YEAR), newFrom.get(Calendar.MONTH), 1, 0, 0, 0);
        newFromMaxDay.add(Calendar.MONTH, 1); //下个月1号
        //在当前月中 这块有问题
        if (toDate.getTime() < newFromMaxDay.getTime().getTime()) {
            monthDay = new BigDecimal(newFrom.getActualMaximum(Calendar.DAY_OF_MONTH));
            return tmpDays.divide(monthDay, 4, BigDecimal.ROUND_HALF_UP).add(new BigDecimal(result)).doubleValue();
        }
        // 上月天数
        days = (newFromMaxDay.getTimeInMillis() - t1) * 1.00 / (24 * 60 * 60 * 1000);
        tmpDays = new BigDecimal(days);
        monthDay = new BigDecimal(newFrom.getActualMaximum(Calendar.DAY_OF_MONTH));
        BigDecimal preRresMonth = tmpDays.divide(monthDay, 4, BigDecimal.ROUND_HALF_UP);

        //下月天数
        days = (t2 - newFromMaxDay.getTimeInMillis()) * 1.00 / (24 * 60 * 60 * 1000);
        tmpDays = new BigDecimal(days);
        monthDay = new BigDecimal(newFromMaxDay.getActualMaximum(Calendar.DAY_OF_MONTH));
        resMonth = tmpDays.divide(monthDay, 4, BigDecimal.ROUND_HALF_UP).add(new BigDecimal(result)).add(preRresMonth).doubleValue();
        return resMonth;
    }
//    public static double dayCompare(Date fromDate, Date toDate) {
//        double resMonth = 0.0;
//        Calendar from = Calendar.getInstance();
//        from.setTime(fromDate);
//        Calendar to = Calendar.getInstance();
//        to.setTime(toDate);
//        //比较月份差 可能有整数 也会负数
//        int result = to.get(Calendar.MONTH) - from.get(Calendar.MONTH);
//        //比较年差
//        int month = (to.get(Calendar.YEAR) - from.get(Calendar.YEAR)) * 12;
//
//        //真实 相差月份
//        result = result + month;
//
//        //开始时间  2021-06-01  2021-08-05   result = 2    2021-08-01
//        Calendar newFrom = Calendar.getInstance();
//        newFrom.setTime(fromDate);
//        newFrom.add(Calendar.MONTH, result);
//        //如果加月份后 大于了当前时间 默认加 月份 -1 情况 12-19  21-01-10
//        //这个是神的逻辑一定好好理解
//        if (newFrom.getTime().getTime() > toDate.getTime()) {
//            newFrom.setTime(fromDate);
//            result = result - 1;
//            newFrom.add(Calendar.MONTH, result);
//        }
//
//        // t1 2021-08-01   t2 2021-08-05
//        long t1 = newFrom.getTime().getTime();
//        long t2 = to.getTime().getTime();
//        //相差毫秒
//        double days = (t2 - t1) * 1.00 / (24 * 60 * 60 * 1000);
//        BigDecimal tmpDays = new BigDecimal(days); //相差天数
//        BigDecimal monthDay = null;
//        Calendar newFromMaxDay = Calendar.getInstance();
//        newFromMaxDay.set(newFrom.get(Calendar.YEAR), newFrom.get(Calendar.MONTH), 1, 0, 0, 0);
//        newFromMaxDay.add(Calendar.MONTH, 1); //下个月1号
//        //在当前月中 这块有问题
//        if (toDate.getTime() < newFromMaxDay.getTime().getTime()) {
//            monthDay = new BigDecimal(newFrom.getActualMaximum(Calendar.DAY_OF_MONTH));
//            return tmpDays.divide(monthDay, 4, BigDecimal.ROUND_HALF_UP).add(new BigDecimal(result)).doubleValue();
//        }
//        // 上月天数
//        days = (newFromMaxDay.getTimeInMillis() - t1) * 1.00 / (24 * 60 * 60 * 1000);
//        tmpDays = new BigDecimal(days);
//        monthDay = new BigDecimal(newFrom.getActualMaximum(Calendar.DAY_OF_MONTH));
//        BigDecimal preRresMonth = tmpDays.divide(monthDay, 4, BigDecimal.ROUND_HALF_UP);
//
//        //下月天数
//        days = (t2 - newFromMaxDay.getTimeInMillis()) * 1.00 / (24 * 60 * 60 * 1000);
//        tmpDays = new BigDecimal(days);
//        monthDay = new BigDecimal(newFromMaxDay.getActualMaximum(Calendar.DAY_OF_MONTH));
//        resMonth = tmpDays.divide(monthDay, 4, BigDecimal.ROUND_HALF_UP).add(new BigDecimal(result)).add(preRresMonth).doubleValue();
//        return resMonth;
//    }

    /**
     * 通过时间秒毫秒数判断两个时间的间隔
@@ -802,4 +808,85 @@
        return calendar.getTime();
    }

    public static boolean sameMonthDay(Date startDate,Date endDate){
        Calendar startCalendar = Calendar.getInstance();
        startCalendar.setTime(startDate);
        Calendar endCalender = Calendar.getInstance();
        endCalender.setTime(endDate);
        if(startCalendar.get(Calendar.DAY_OF_MONTH) == endCalender.get(Calendar.DAY_OF_MONTH)){
            return true;
        }

        return false;
    }

    /**
     * 计算 fromDate 2023-01-12  toDate 2023-09-15
     * 2023-01-12--->2023-01-01        --->  2023-09-01    ------> 2023-09-15
     * fromDate ---> fromDateFirstDate --->  toDateFirstDate ----> toDate
     *
     * @param fromDate
     * @param toDate
     * @return
     */
    public static double dayCompare(Date fromDate, Date toDate) {


        //todo 需要计算三端时间 相加即可
        Date fromDateFirstDate = fromDate; // 第一个1日

        Date toDateFirstDate = toDate; // 最后一个1日

        boolean firstDay = true;

        //todo 1.0 计算 fromDateFirstDate
        Calendar fromDateCal = Calendar.getInstance();
        fromDateCal.setTime(fromDate);
        fromDateCal.set(Calendar.DAY_OF_MONTH, 1);
        if (fromDate.getTime() > fromDateCal.getTime().getTime()) {
            fromDateCal.add(Calendar.MONTH, 1);
            firstDay = false;
            fromDateFirstDate = fromDateCal.getTime();
        }

        //todo 2.0 计算 toDateFirstDate
        Calendar toDateCal = Calendar.getInstance();
        toDateCal.setTime(toDate);
        toDateCal.set(Calendar.DAY_OF_MONTH, 1);
        if (toDate.getTime() > toDateCal.getTime().getTime()) {
            toDateFirstDate = toDateCal.getTime();
        }

        // todo 3.0 计算整数月  fromDateFirstDate --->  toDateFirstDate
        Calendar from = Calendar.getInstance();
        from.setTime(fromDateFirstDate);
        Calendar to = Calendar.getInstance();
        to.setTime(toDateFirstDate);
        //比较月份差 可能有整数 也会负数
        int result = to.get(Calendar.MONTH) - from.get(Calendar.MONTH);
        //比较年差
        int month = (to.get(Calendar.YEAR) - from.get(Calendar.YEAR)) * 12;
        //真实 相差月份
        result = result + month;

        //todo 3.1  如果 fromDate 和toDate 是同一天 则直接返回整月，不再计算 4.0 和5.0
        if (DateUtil.sameMonthDay(fromDate, toDate)) {
            return firstDay ? result : result + 1;
        }

        // todo 4.0 计算 fromDate ---> fromDateFirstDate 的月份
        double days = (fromDateFirstDate.getTime() - fromDate.getTime()) * 1.00 / (24 * 60 * 60 * 1000);
        BigDecimal tmpDays = new BigDecimal(days); //相差天数
        BigDecimal monthDay = new BigDecimal(DateUtil.getMonthDay(fromDate));
        BigDecimal resMonth = tmpDays.divide(monthDay, 4, BigDecimal.ROUND_HALF_UP).add(new BigDecimal(result));

        // todo 5.0 计算  toDateFirstDate ----> toDate 月份
        days = (toDate.getTime() - toDateFirstDate.getTime()) * 1.00 / (24 * 60 * 60 * 1000);
        tmpDays = new BigDecimal(days); //相差天数
        monthDay = new BigDecimal(DateUtil.getMonthDay(toDate));
        resMonth = tmpDays.divide(monthDay, 4, BigDecimal.ROUND_HALF_UP).add(resMonth);

        return resMonth.doubleValue();

    }
}