java.time · java.base · since Java 1.8

Duration

declaration

public final class Duration
        implements TemporalAmount, Comparable<Duration>, Serializable

A machine-time span in seconds/nanos: timeouts, elapsed measurement, exact arithmetic. Period is its calendar-unit sibling.

Key methods

`static Duration ofSeconds/ofMillis/ofMinutes(long)`	Creation.
`static Duration between(Temporal start, Temporal end)`	Elapsed between two instants.
`long toMillis() / toSeconds()`	Conversions for legacy APIs.
`Duration plus(Duration) / multipliedBy(long)`	Arithmetic.