使用joda_time计算两时间的月数差，天数差

private static final DateTimeFormatter formatter = DateTimeFormat.forPattern("yyyy-MM-dd");

    /**
     * 利用joda_time包计算
     *
     * @param dateTime1 时间1
     * @param dateTime2 时间2
     * @return 两个时间的月份差值
     */
    private static int getMonthDifferent(DateTime dateTime1, DateTime dateTime2) {
        return Months.monthsBetween(dateTime1, dateTime2).getMonths();
    }

    /**
     * 利用joda_time包计算
     *
     * @param dateTime1 时间1
     * @param dateTime2 时间2
     * @return 两个时间的自然天数差值
     */
    private static int getDaysDifferent(DateTime dateTime1, DateTime dateTime2) {
        return Days.daysBetween(dateTime1, dateTime2).getDays();
    }

    /**
     * 利用joda_time包计算两个时间的天数差
     *
     * @param dt1 时间1
     * @param dt2 时间2
     * @return 天数差
     */
    private static int getDaysDifferent(Date dt1, Date dt2) {
        DateTime dateTime1 = new DateTime(dt1);
        DateTime dateTime2 = new DateTime(dt2);
        return Days.daysBetween(dateTime1, dateTime2).getDays();
    }


    /**
     * 通过Calendar类得日期比较，在这需要考虑闰年和平年，也要考虑跨年份
     *
     * @param date1 时间1
     * @param date2 时间2
     * @return 两个时间的自然天数差值
     */
    public static int differentDays(Date date1, Date date2) {
        Calendar cal1 = Calendar.getInstance();
        cal1.setTime(date1);

        Calendar cal2 = Calendar.getInstance();
        cal2.setTime(date2);
        int day1 = cal1.get(Calendar.DAY_OF_YEAR);
        int day2 = cal2.get(Calendar.DAY_OF_YEAR);

        int year1 = cal1.get(Calendar.YEAR);
        int year2 = cal2.get(Calendar.YEAR);
        if (year1 != year2) {  //不同一年
            int timeDistance = 0;
            for (int i = year1; i < year2; i++) {
                if (i % 4 == 0 && i % 100 != 0 || i % 400 == 0) { //闰年
                    timeDistance += 366;
                } else { //不是闰年
                    timeDistance += 365;
                }
            }
            return timeDistance + (day2 - day1);
        } else { //同一年
            return day2 - day1;
        }
    }

    /**
     * LocalDateTime 计算两个时间的时间差
     *
     * @param dt1 时间1
     * @param dt2 时间2
     * @return 两个时间的月份差值
     */
    private static int getMonthDifferent(LocalDateTime dt1, LocalDateTime dt2) {
        //获取第一个时间点的月份
        int month1 = dt1.getMonthValue();
        //获取第一个时间点的年份
        int year1 = dt1.getYear();
        //获取第一个时间点的月份
        int month2 = dt2.getMonthValue();
        //获取第一个时间点的年份
        int year2 = dt2.getYear();
        //返回两个时间点的月数差
        return (year2 - year1) * 12 + (month2 - month1);
    }

    /**
     * 计算月份差
     *
     * @param time1 时间1
     * @param time2 时间2
     * @return 两个时间的月份差值
     */
    private static int getMonthDifferent(Integer time1, Integer time2) {
        LocalDateTime startTime = LocalDateTime.ofEpochSecond(time1, 0, ZoneOffset.ofHours(8));
        LocalDateTime endTime = LocalDateTime.ofEpochSecond(time2, 0, ZoneOffset.ofHours(8));
        return getMonthDifferent(startTime, endTime);
    }

    public static void main(String[] args) {
        DateTime dateTime1 = formatter.parseDateTime("2018-01-12");
        DateTime dateTime2 = formatter.parseDateTime("2019-12-25");
        int months = getMonthDifferent(dateTime1, dateTime2);
        System.out.println("1、月份差：" + months);

        LocalDateTime of1 = LocalDateTime.of(2018, 1, 12, 1, 1);
        LocalDateTime of2 = LocalDateTime.of(2019, 12, 25, 23, 16);
        int monthDiff = getMonthDifferent(of1, of2);
        System.out.println("2、月份差：" + monthDiff);

        int daysDifferent = getDaysDifferent(dateTime1, dateTime2);
        System.out.println("1、天数差：" + daysDifferent);

        int days = differentDays(new Date(2018 , 1 , 12), new Date(2019 , 12 ,25));
        System.out.println("2、天数差：" + days);

        Date date = Date.from(LocalDate.of(2016, 2, 1).atStartOfDay().atZone(ZoneId.systemDefault()).toInstant());
        Date date2 = Date.from(LocalDate.of(2018, 3, 1).atStartOfDay().atZone(ZoneId.systemDefault()).toInstant());
        int different = getDaysDifferent(date, date2);
        System.out.println("3、天数差：" +different);
    }

运行结果：

原文链接: https://onlyou.blog.csdn.net//article/details/103768532