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# Time

Measure how long an operation takes and determine schedules in the future.

## Topics

### Clocks

[`Clock`](/documentation/Swift/Clock)

A mechanism in which to measure time, and delay work until a given point
in time.

[`ContinuousClock`](/documentation/Swift/ContinuousClock)

A clock that measures time that always increments and does not stop
incrementing while the system is asleep.

[`SuspendingClock`](/documentation/Swift/SuspendingClock)

A clock that measures time that always increments but stops incrementing
while the system is asleep.

### Durations

[`Duration`](/documentation/Swift/Duration)

A representation of high precision time.

[`DurationProtocol`](/documentation/Swift/DurationProtocol)

A type that defines a duration for a given `InstantProtocol` type.

### Supporting Types

[`InstantProtocol`](/documentation/Swift/InstantProtocol)


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