java计算两时间相隔年月日时分秒,

 返回 2018/12/19-16:58:24 格式的日期格式

  //获取时间差方法    
    public static String getTime(Date currentTime,Date firstTime){
        long diff = currentTime.getTime() - firstTime.getTime();//这样得到的差值是微秒级别
        Calendar  currentTimes =dataToCalendar(currentTime);//当前系统时间转Calendar类型
        Calendar  firstTimes =dataToCalendar(firstTime);//查询的数据时间转Calendar类型
        int year = currentTimes.get(Calendar.YEAR) - firstTimes.get(Calendar.YEAR);//获取年
        int month = currentTimes.get(Calendar.MONTH) - firstTimes.get(Calendar.MONTH);
        int day = currentTimes.get(Calendar.DAY_OF_MONTH) - firstTimes.get(Calendar.DAY_OF_MONTH);
        if (day < 0) {
            month -= 1;
            currentTimes.add(Calendar.MONTH, -1);
            day = day + currentTimes.getActualMaximum(Calendar.DAY_OF_MONTH);//获取日
        }
        if (month < 0) {
            month = (month + 12) % 12;//获取月
            year--;
        }
        long days = diff / (1000 * 60 * 60 * 24);
        long hours = (diff-days*(1000 * 60 * 60 * 24))/(1000* 60 * 60); //获取时 
        long minutes = (diff-days*(1000 * 60 * 60 * 24)-hours*(1000* 60 * 60))/(1000* 60);//获取分钟
        long s=(diff/1000-days*24*60*60-hours*60*60-minutes*60);//获取秒
        //年月日时分秒
        String CountTime=year+"/"+month+"/"+day+"-"+hours+":"+minutes+":"+s+"";
        return CountTime;
    }

    //Date类型转Calendar类型
    public static Calendar dataToCalendar(Date date) {
        Calendar calendar = Calendar.getInstance();
        calendar.setTime(date);
        return calendar;
    }