datetime difference as minute

import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Date;


public class Main {

	public static void main(String[] args) {
			
		
		SimpleDateFormat format = new SimpleDateFormat("dd MM yy HH:mm");  
		
		String dateStart = "10 11 2015 21:00";
		Date start = null;
		 
		try {
			start = format.parse(dateStart);		   
		} catch (ParseException e) {
		    e.printStackTrace();
		}
		
		System.out.println(getDiff(start));


	}
	
	public static String getDiff(Date _date){
		Date _now = new Date();
		long diff = _now.getTime() - _date.getTime();
		
		int diffMinutes = (int)diff / (60 * 1000);     
		
		String mesaj = "";
		if(diffMinutes < 60)
			mesaj = diffMinutes + " dakika önce";
		else if(60 <= diffMinutes && diffMinutes < 60*24)
			mesaj = diffMinutes/60 + " saat önce";
		else if(60*24 <= diffMinutes && diffMinutes < 30*60*24)
			mesaj = diffMinutes/(60*24) + " gun önce";
		else
			mesaj = "yıllaar önce";
		
		return mesaj;
	}

}