Java Utililty Methods Duration to

Float hours = Float.valueOf(duration.toMinutes()) / 60;
return round(hours, 2);

String s = "";
boolean started = false;
if (d.toDays() >= 365) {
    started = true;
    s += d.toDays() / 365 + " year" + ((d.toDays() / 365 != 1) ? "s" : "") + ", ";
    d = d.minus(Duration.ofDays(d.toDays() / 365 * 365));
if (started || d.toDays() >= 30) {
...

LocalDateTime start = LocalDateTime.ofInstant(Instant.ofEpochSecond(unixTime), ZoneId.systemDefault());
LocalDateTime end = LocalDateTime.ofInstant(Instant.ofEpochSecond(0), ZoneId.systemDefault());
Duration duration = Duration.between(end, start);
long hours = duration.toHours();
long minutes = duration.minusHours(hours).toMinutes();
return String.format("%02d:%02d", hours, minutes);

Duration dur = Duration.ZERO;
Matcher match = DUR_PAT.matcher(durationString);
while (match.find()) {
    long amount = Long.parseLong(match.group(1));
    switch (match.group(2)) {
    case "d":
        dur = dur.plusDays(amount);
        break;
...

BigInteger ret = BigInteger.valueOf(duration.getSeconds());
ret = ret.multiply(micromult);
ret = ret.add(BigInteger.valueOf(duration.getNano() / 1000));
return ret;

double result = time.getSeconds();
result += ((double) time.getNano()) / NANOS_PER_SECOND;
return result;

return duration.toMillis() / 50;

switch ((ChronoUnit) unit) {
case NANOS:
    return duration.toNanos();
case MICROS:
    return toMicros(duration);
case MILLIS:
    return duration.toMillis();
case SECONDS:
...