Java時間差

DateFormat df = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
			try {
				Date d1 = df.parse("2016-05-01 13:22:35"));
				Date d2 = new Date(System.currentTimeMillis());// 你也可以獲取當前時間
				long diff = d2.getTime() - d1.getTime();// 這樣得到的差值是微秒級別
				long days = diff / (1000 * 60 * 60 * 24);
				long hours = (diff - days * (1000 * 60 * 60 * 24))
						/ (1000 * 60 * 60);
				long minutes = (diff - days * (1000 * 60 * 60 * 24) - hours
						* (1000 * 60 * 60))
						/ (1000 * 60);
				if (days > 0) {
					holder.tv_time.setText(days + "天前");
				} else if (hours > 0) {
					holder.tv_time.setText(hours + "小時前");
				} else if (minutes >= 0) {
					holder.tv_time.setText(hours + "分鐘前");
				}
			} catch (Exception e) {
				e.printStackTrace();
			}