计算时间差公式

 要求：计算2个日期之间的时间差

    /**
     * 计算两个日期之间的时间差
     * 
     * @param begindate
     * @param enddate
     */
    public void getTimeDiff(Date begindate, Date enddate) {
        // 开始时间
        Instant startInstant = Instant.ofEpochMilli(begindate.getTime());
        // 结束时间
        Instant endtInstant = Instant.ofEpochMilli(enddate.getTime());
        // 结束时间-开始时间
        Duration duration = Duration.between(startInstant, endtInstant);

        long days = duration.toDays();
        System.err.println("间隔天数:" + days);

        long hours = duration.toHours();
        System.err.println("间隔小时数:" + hours);

        long minutes = duration.toMinutes();
        System.err.println("间隔分钟数:" + minutes);

        long seconds = duration.getSeconds();
        System.err.println("间隔秒数:" + seconds);

        long millis = duration.toMillis();
        System.err.println("间隔毫秒数:" + millis);

        long nanos = duration.toNanos();
        System.err.println("间隔纳秒数:" + nanos);
    }