Pretty minutes ago formatter for Calendar bject

PrettyFormatCalendar.java

public class PrettyFormatCalendar{
  private Calendar before;

  public PrettyFormatCalendar(Calendar before) {
    this.before = before;
  }

  public long minutesAgoFrom(Calendar other){
    long diff = other.getTimeInMillis() - before.getTimeInMillis();
    return TimeUnit.MILLISECONDS.toMinutes(diff);
  }
}