時間差 dateDifference

public static void main(String[] args) {
	// TODO Auto-generated method stub
	try {
		SimpleDateFormat df = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");//設置日期格式
		String currentTime = df.format(new Date());// new Date()爲獲取當前系統時間
		String oldTime = "2013-12-29 12:13:22";// 之前查詢的時間
		String aString = TimeDiff(oldTime, currentTime);
		System.out.println(aString);
	} catch (Exception e) {
		// TODO Auto-generated catch block
		e.printStackTrace();
	}
}

public static String TimeDiff(String oldTime, String newTime)
		throws Exception {
	SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd hh:mm:ss");
	Long beginL = format.parse(oldTime).getTime();
	Long endL = format.parse(newTime).getTime();
	Long year = (endL - beginL) / 86400000 / 30 / 12;
	Long month = (endL - beginL) / 86400000 / 30;
	Long day = (endL - beginL) / 86400000;
	Long hour = ((endL - beginL) % 86400000) / 3600000;
	Long min = ((endL - beginL) % 86400000 % 3600000) / 60000;
	if(year == 0){
		if(month == 0){
			if(day == 0){
				if(hour == 0){
					if(min > 0){
						return min+"分鐘前";
					}else{
						return "剛剛";
					}
				}else{
					return hour+"小時前";
				}
			}else{
				return day+"天前";
			}
		}else{
			return month+"個月前";
		}
	}else{
		return year+"年前";
	}
}