/**
* Obtains a {@code Duration} representing an amount in the specified unit.
* <p>
* The parameters represent the two parts of a phrase like '6 Hours'. For example:
* <pre>
* Duration.of(3, SECONDS);
* Duration.of(465, HOURS);
* </pre>
* Only a subset of units are accepted by this method.
* The unit must either have an {@linkplain TemporalUnit#isDurationEstimated() exact duration} or
* be {@link ChronoUnit#DAYS} which is treated as 24 hours. Other units throw an exception.
*
* @param int $amount the amount of the duration, measured in terms of the unit, positive or negative
* @param TemporalUnit $unit the unit that the duration is measured in, must have an exact duration, not null
* @return Duration a {@code Duration}, not null
* @throws DateTimeException if the period unit has an estimated duration
* @throws ArithmeticException if a numeric overflow occurs
*/
public static function of($amount, TemporalUnit $unit)
{
return self::$ZERO->plus($amount, $unit);
}
