---
title: clock
framework: realitykit
role: symbol
role_heading: Instance Property
path: realitykit/animationplaybackcontroller/clock
---

# clock

A reference clock to synchronize the animation with other events.

## Declaration

```swift
@MainActor @preconcurrency var clock: CMClockOrTimebase { get set }
```

## See Also

### Timing animation playback

- [duration](realitykit/animationplaybackcontroller/duration.md)
- [speed](realitykit/animationplaybackcontroller/speed.md)
- [time](realitykit/animationplaybackcontroller/time.md)