---
title: clockDomain
framework: Core Audio
role: symbol
role_heading: Instance Property
platforms: [macOS 15.0+]
path: coreaudio/audiohardwareclock/clockdomain
---

# clockDomain

A UInt32 whose value indicates the clock domain to which this object belongs. Clocks and devices that have the same value for this property are able to be synchronized in hardware.

## Declaration

```swift
var clockDomain: UInt32 { get throws }
```

## Discussion

Discussion A value of 0 indicates that the clock domain for the object is unspecified and should be assumed to be separate from every other object’s clock domain, even if they have the value of 0 as their clock domain as well.