---
title: absoluteTimeNanoSeconds
framework: xctest
role: symbol
role_heading: Instance Property
path: xctest/xctperformancemeasurementtimestamp/absolutetimenanoseconds
---

# absoluteTimeNanoSeconds

The nanoseconds component of the absolute time.

## Declaration

```swift
var absoluteTimeNanoSeconds: UInt64 { get }
```

## Discussion

Discussion This property reflects the number of nanoseconds since an arbitrary reference time. It doesn’t update while the system is sleeping.

## See Also

### Mach Absolute Time

- [absoluteTime](xctest/xctperformancemeasurementtimestamp/absolutetime.md)