date diff in java for android app test NOTE: months begins with 0 in calendar

DateTest

import static java.lang.System.*;
import java.util.*;
import java.util.concurrent.TimeUnit;

class DateTest
{
    public void test()
    {
        TimeUnit timeUnit = TimeUnit.SECONDS;

        Calendar cal1 = Calendar.getInstance(); 
        Date d = cal1.getTime();
        out.println(d.toString());
        Calendar cal2 = Calendar.getInstance();
        cal2.set(2013, 9-1, 23);
        Date d2 = cal2.getTime();

        long dl = d.getTime();
        long dl2 = d2.getTime();

        long diffInMillies = dl-dl2;
        long s = timeUnit.convert(diffInMillies, TimeUnit.MILLISECONDS);

        long years = s / (60 * 60 * 24 * 365);
        long restYears = s - (years * 60 * 60 * 24 * 365);
        long months = restYears / (24 * 60 * 60 * 30);
        long restMonths = restYears - (months * 24 * 60 * 60 * 30);
        long weeks = restMonths / (24 * 60 * 60 * 7);
        long restWeeks = restMonths - (weeks * 24 * 60 * 60 * 7);
        long days = restWeeks / (24 * 60 * 60);

        String dates = "";

        if (years > 0) {
            dates += years + " year";
            if (years == 1) 
                dates += " ";
            else
                dates += "s ";
        }

        if (months > 0) {
            dates += months + " month";
            if (months == 1)
                dates += " ";
            else 
                dates += "s ";
        }

        if (weeks > 0) {
            dates += weeks + " week";
            if (weeks == 1) 
                dates += " ";
            else
                dates += "s ";
        }

        dates += days + " day";
        if (days > 1) {
            dates += "s";
        }

        dates += " old";

        out.println( dates );
    }

	public static void main(String[] args)
    {
		DateTest d = new DateTest();
        d.test();
	}

}

its also possible to use MessageFormat for plural/singular forms:

String formatString = "there were {0} {0,choice,0#objects|1#object|1<objects}";
MessageFormat fmt = new MessageFormat(formatString);
fmt.format(new Object[] { new Long(numberOfObjects) });