Java计算年月日时分秒时间差（两个时间相减）

//测试主方法 public static void main(String[] args) { Date currentTime = df.parse("2004-03-26 13:31:40"); //当前系统时间 Date firstTime = df.parse("2004-01-02 11:30:24"); //查询的数据时间 String str=getTime（currentTime ,firstTime ）; System.out.println("获取的年月日时分秒时间差为："+str); } //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 String CountTime=""+"year"+"年"+month+"月"+day+"天"+hours+"小时"+minutes+"分"+s+"秒"; return CountTime; } //Date类型转Calendar类型 public static Calendar dataToCalendar(Date date) { Calendar calendar = Calendar.getInstance(); calendar.setTime(date); return calendar; }