Date d1 = xxx;
Date d2 = yyy;
Calendar c1 = Calendar.getInstance();
Calendar c2 = Calendar.getInstance();
c1.setTime(d1);
c2.setTime(d2);
c1.set(Calendar.SECOND, 0);
c1.set(Calendar.MILLISECOND, 0);
c2.set(Calendar.SECOND, 0);
c2.set(Calendar.MILLISECOND, 0);
if (c1.before(c2)) {
    System.out.println("c1 is smaller than c2");
} else if (c1.after(c2)) {
    System.out.println("c1 is bigger than c2");
} else {
    System.out.println("c1 equals c2");
}