TimeDifferenceCalculator

import java.util.Calendar;

public class TimeDifferenceCalculator {

    static long secondInMillis = 1000;
    static long minuteInMillis = secondInMillis * 60;
    static long hourInMillis = minuteInMillis * 60;
    static long dayInMillis = hourInMillis * 24;

    public static void main(String[] args) {
        Calendar day1 = Calendar.getInstance();
        Calendar day2 = Calendar.getInstance();
        day1.set(2017, 0, 1);
        day2.set(2015, 6, 8);
        long diff = Math.abs(day1.getTimeInMillis() - day2.getTimeInMillis());
        int years = (int)((diff / dayInMillis)/ 365);
        int months = (int) ((diff / dayInMillis) / 30);
        int residualMonths = (int) (((diff / dayInMillis) / 30) - (12 * years));
        long elapsedDays = diff / dayInMillis;
        diff = diff % dayInMillis;
        long elapsedHours = diff / hourInMillis;
        diff = diff % hourInMillis;
        long elapsedMinutes = diff / minuteInMillis;
        diff = diff % minuteInMillis;
        long elapsedSeconds = diff / secondInMillis;
        long days = (diff / (60 * 60 * 24 * 1000));
    }
}