java8中计算两个日期时间LocalDateTime的时间差，格式化成xx年yy月zz日aa时bb分cc秒

    @Test
    public void test2()
    {
        LocalDateTime fromDateTime = LocalDateTime.of(1984, 12, 16, 7, 45, 55);
        LocalDateTime toDateTime = LocalDateTime.of(2014, 9, 10, 6, 40, 45);

        LocalDateTime tempDateTime = LocalDateTime.from( fromDateTime );

        long years = tempDateTime.until( toDateTime, ChronoUnit.YEARS);
        tempDateTime = tempDateTime.plusYears( years );

        long months = tempDateTime.until( toDateTime, ChronoUnit.MONTHS);
        tempDateTime = tempDateTime.plusMonths( months );

        long days = tempDateTime.until( toDateTime, ChronoUnit.DAYS);
        tempDateTime = tempDateTime.plusDays( days );


        long hours = tempDateTime.until( toDateTime, ChronoUnit.HOURS);
        tempDateTime = tempDateTime.plusHours( hours );

        long minutes = tempDateTime.until( toDateTime, ChronoUnit.MINUTES);
        tempDateTime = tempDateTime.plusMinutes( minutes );

        long seconds = tempDateTime.until( toDateTime, ChronoUnit.SECONDS);

        System.out.println( years + " 天 " +
                months + " 月 " +
                days + " 天 " +
                hours + " 时 " +
                minutes + " 分 " +
                seconds + " 秒.");
    }