Java Utililty Methods TimeUnit Usage

long days = TimeUnit.SECONDS.toDays(time) % 30;
long hours = TimeUnit.SECONDS.toHours(time) % 24;
long minutes = TimeUnit.SECONDS.toMinutes(time) % 60;
long seconds = TimeUnit.SECONDS.toSeconds(time) % 60;
return (days == 0L) ? String.format("%d hours, %d minutes; and %d seconds", hours, minutes, seconds)
        : String.format("%d days, %d hours, %d minutes; and %d seconds", days, hours, minutes, seconds);

long minutes = TimeUnit.NANOSECONDS.toMinutes(timeInNanoseconds);
long secondes = TimeUnit.NANOSECONDS.toSeconds(timeInNanoseconds) - TimeUnit.MINUTES.toSeconds(minutes);
long ms = TimeUnit.NANOSECONDS.toMillis(timeInNanoseconds) - TimeUnit.MINUTES.toMillis(minutes)
        - TimeUnit.SECONDS.toMillis(secondes);
StringBuilder builder = new StringBuilder();
if (minutes > 0) {
    builder.append(minutes);
    builder.append(" min ");
...

return formatTime(format, nanoseconds, TimeUnit.NANOSECONDS);

String timeDuration;
long days = TimeUnit.MILLISECONDS.toDays(duration);
long hours = TimeUnit.MILLISECONDS.toHours(duration)
        - TimeUnit.DAYS.toHours(TimeUnit.MILLISECONDS.toDays(duration));
long minutes = TimeUnit.MILLISECONDS.toMinutes(duration)
        - TimeUnit.HOURS.toMinutes(TimeUnit.MILLISECONDS.toHours(duration));
long seconds = TimeUnit.MILLISECONDS.toSeconds(duration)
        - TimeUnit.MINUTES.toSeconds(TimeUnit.MILLISECONDS.toMinutes(duration));
...

try {
    StringBuffer durationInString = new StringBuffer("");
    long minutes = TimeUnit.MILLISECONDS.toSeconds(duration) / 60;
    long seconds = TimeUnit.MILLISECONDS.toSeconds(duration - minutes * 60 * 1000);
    long milliseconds = duration - (minutes * 60 * 1000) - seconds * 1000;
    if (minutes > 0) {
        durationInString.append(minutes).append(" min ");
    if (seconds > 0) {
        durationInString.append(seconds).append(" sec ");
    if (milliseconds > 0) {
        durationInString.append(milliseconds).append(" msec");
    return durationInString.toString();
} catch (Exception e) {
    e.printStackTrace();
    return "-1";

long seconds = TimeUnit.MILLISECONDS.toSeconds(System.currentTimeMillis() - startTime);
final long days = seconds / TimeUnit.DAYS.toSeconds(1);
seconds -= TimeUnit.DAYS.toSeconds(days);
final long hours = seconds / TimeUnit.HOURS.toSeconds(1);
seconds -= TimeUnit.HOURS.toSeconds(hours);
final long minutes = seconds / TimeUnit.MINUTES.toSeconds(1);
seconds -= TimeUnit.MINUTES.toSeconds(minutes);
return String.format("%dd:%dh:%dm:%ds", days, hours, minutes, seconds);
...

long remainingMs = uptimeInMs;
long days = TimeUnit.MILLISECONDS.toDays(remainingMs);
remainingMs -= TimeUnit.DAYS.toMillis(days);
long hours = TimeUnit.MILLISECONDS.toHours(remainingMs);
remainingMs -= TimeUnit.HOURS.toMillis(hours);
long minutes = TimeUnit.MILLISECONDS.toMinutes(remainingMs);
remainingMs -= TimeUnit.MINUTES.toMillis(minutes);
long seconds = TimeUnit.MILLISECONDS.toSeconds(remainingMs);
...

Calendar cal = Calendar.getInstance(TimeZone.getTimeZone("UTC"));
if (laterThan == null) {
    cal.add(GregorianCalendar.YEAR, -1);
    cal.add(GregorianCalendar.MONTH, (int) (Math.round(Math.random() * 12)) * -1);
    cal.add(GregorianCalendar.WEEK_OF_MONTH, (int) (Math.round(Math.random() * 4)) * -1);
    cal.add(GregorianCalendar.DAY_OF_WEEK, (int) (Math.round(Math.random() * 7)) * -1);
    laterThan = cal.getTime();
long randomAdditionalTime = (long) (Math.round(Math.random() * TimeUnit.DAYS.toMillis(1)));
cal.setTimeInMillis(laterThan.getTime() + randomAdditionalTime);
return cal.getTime();

long day = TimeUnit.DAYS.convert(System.currentTimeMillis() - birthday.getTime(), TimeUnit.MILLISECONDS);
return (int) (day / 365);

long headerTimeMillis = TimeUnit.SECONDS.toMillis(headerTimestampSec);
return currentTimeMillis - headerTimeMillis;