Java Utililty Methods Duration Format

final int hours = len / 3600;
final int minutes = len / 60 % 60;
final int seconds = len % 60;
return String.format("%02d:%02d:%02d", hours, minutes, seconds);

StringBuilder builder = new StringBuilder();
long years = duration / millisPerYear;
duration -= years * millisPerYear;
long months = duration / millisPerMonth;
duration -= months * millisPerMonth;
long weeks = duration / millisPerWeek;
duration -= weeks * millisPerWeek;
long days = duration / millisPerDay;
...

if (duration < 0L) {
    return "N/A";
return Long.toString(duration);

if (duration == null) {
    return null;
return LocalTime.ofNanoOfDay(duration.toNanos()).format(DateTimeFormatter.ofPattern(DURATION_FORMAT));

return (int) ((millis / 1000) % 60);

final StringBuffer sb = new StringBuffer(8);
int sec = (int) (msec / 1000);
if (sec > 60 * 60) {
    final int hours = sec / (60 * 60);
    sb.append(hours);
    sec -= hours * (60 * 60);
    sb.append(':');
final int minutes = sec / 60;
if (sb.length() > 0) {
    appendTwoDigits(sb, minutes, '0');
} else {
    sb.append(minutes);
sb.append(':');
sec -= minutes * 60;
appendTwoDigits(sb, sec, '0');
return sb.toString();

String seconds = "" + (int) ((millis / 1000) % 60);
int m = (int) ((millis / 1000) / 60);
if (m > 60) {
    return "";
String minutes = "" + m;
String hours = "" + (int) ((millis / 1000) / 3600);
if (seconds.length() == 1) {
...

long duration = durationInMilliSeconds / 1000; 
StringBuilder result = new StringBuilder();
if (duration >= MONTH) {
    final long value = duration / MONTH;
    duration -= (value * MONTH);
    result.append(value).append("month(s)");
if (duration >= DAY) {
...

double durationInMillis = (double) durationInMillisLong;
return durationToString(durationInMillis);

boolean negative = false;
if (durationMs < 0) {
    negative = true;
    durationMs = -durationMs;
long durationSec = durationMs / 1000;
final int secondsPerMinute = 60;
final int secondsPerHour = 60 * 60;
...