Java Utililty Methods TimeUnit Usage

Calendar cal = Calendar.getInstance();
Date dateEnd = cal.getTime();
long diffInMillies = dateEnd.getTime() - dateStart.getTime();
TimeUnit timeUnit = TimeUnit.SECONDS;
return timeUnit.convert(diffInMillies, TimeUnit.MILLISECONDS);

return (int) TimeUnit.NANOSECONDS.toSeconds(System.nanoTime());

return TimeUnit.MILLISECONDS.toSeconds(new Date().getTime());

return timeComparisonEpsilonMicros;

String result = "";
long duration = endDate.getTime() - startDate.getTime();
long diffInMilli = TimeUnit.MILLISECONDS.toMillis(duration);
long diffInSeconds = TimeUnit.MILLISECONDS.toSeconds(duration);
long diffInMinutes = TimeUnit.MILLISECONDS.toMinutes(duration);
long diffInHours = TimeUnit.MILLISECONDS.toHours(duration);
long diffInDays = TimeUnit.MILLISECONDS.toDays(duration);
if (diffInDays > 0)
...

final String format = String.format("%02d:%02d:%02d", TimeUnit.MILLISECONDS.toHours(time),
        TimeUnit.MILLISECONDS.toMinutes(time) % TimeUnit.HOURS.toMinutes(1),
        TimeUnit.MILLISECONDS.toSeconds(time) % TimeUnit.MINUTES.toSeconds(1));
return time < 3600000 ? format.substring(3) : format;

return new Date(System.currentTimeMillis() + TimeUnit.DAYS.toMillis(1));

TimeUnit timeUnit;
int unitsLen = 1;
switch (str.charAt(str.length() - 1)) {
case 'd':
    timeUnit = TimeUnit.DAYS;
    break;
case 'h':
    timeUnit = TimeUnit.HOURS;
...

if (millis < 1L) {
    return "not very long!";
} else {
    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);
...

long hours = TimeUnit.MILLISECONDS.toHours(timeZone.getRawOffset());
long minutes = TimeUnit.MILLISECONDS.toMinutes(timeZone.getRawOffset()) - TimeUnit.HOURS.toMinutes(hours);
minutes = Math.abs(minutes);
String result = "";
if (hours > 0) {
    result = String.format("GMT+%d:%02d %s", hours, minutes, timeZone.getID());
} else {
    result = String.format("GMT%d:%02d %s", hours, minutes, timeZone.getID());
...