timebreakdown

public static String getTimeBreakdown(long millis)
  {
    if (millis < 0L) {
      return "N/A";
    }

    if (TimeUnit.MILLISECONDS.toMinutes(millis) == 0L) {
      return TimeUnit.MILLISECONDS.toSeconds(millis) + " Seconds";
    }

    long days = TimeUnit.MILLISECONDS.toDays(millis);
    millis -= TimeUnit.DAYS.toMillis(days);
    long hours = TimeUnit.MILLISECONDS.toHours(millis);
    millis -= TimeUnit.HOURS.toMillis(hours);
    long minutes = TimeUnit.MILLISECONDS.toMinutes(millis);
    millis -= TimeUnit.MINUTES.toMillis(minutes);

    StringBuilder sb = new StringBuilder(16);

    sb.append(days + "D ");

    sb.append(hours + "H ");

    sb.append(minutes + "M ");

    return sb.toString();
  }