[Java] Smart Display of TimeAgo using miliseconds (eg. 20 days ago)

main.java

public static void main(){
    // String to convert into date
    String toConvert = "2015-12-09 13:48:17"
    SimpleDateFormat formatter = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");

    // Convert the string into date
    Date convertedDate = formatter.parse(toConvert);

    // Get Current Date
    Date now = new Date();

    // Get date difference in milliseconds
    long diffInMillies =  now.getTime() - convertedDate.getTime();

    // Return result
    System.out.println(TimeAgo.toDuration(diffInMillies));
}

TimeAgo.java

import java.util.Arrays;
import java.util.List;
import java.util.concurrent.TimeUnit;

public class TimeAgo {
    public static final List<Long> times = Arrays.asList(
            TimeUnit.DAYS.toMillis(365),
            TimeUnit.DAYS.toMillis(30),
            TimeUnit.DAYS.toMillis(1),
            TimeUnit.HOURS.toMillis(1),
            TimeUnit.MINUTES.toMillis(1),
            TimeUnit.SECONDS.toMillis(1));
    public static final List<String> timesString = Arrays.asList("year", "month", "day", "hour", "minute", "second");

    public static String toDuration(long duration) {

        StringBuffer res = new StringBuffer();
        for (int i = 0; i < times.size(); i++) {
            Long current = times.get(i);
            long temp = duration / current;
            if (temp > 0) {
                res.append(temp).append(" ").append(timesString.get(i)).append(temp > 1 ? "s" : "").append(" ago");
                break;
            }
        }
        if ("".equals(res.toString()))
            return "0 second ago";
        else
            return res.toString();
    }
}