---
title: realTimeClockSource
framework: AVFoundation
role: symbol
role_heading: Type Property
platforms: [iOS 26.0+, iPadOS 26.0+, Mac Catalyst 26.0+, macOS 26.0+, tvOS 26.0+]
path: avfoundation/avcapturetimecodegenerator/realtimeclocksource
---

# realTimeClockSource

A predefined timecode source synchronized to the real-time system clock.

## Declaration

```swift
class var realTimeClockSource: AVCaptureTimecode.Source { get }
```

## Discussion

Discussion This class property provides a default timecode source based on the real-time system clock, requiring no external device. It is ideal for live events or scenarios where alignment with the current time of day is necessary.

## See Also

### Managing sources

- [currentSource](avfoundation/avcapturetimecodegenerator/currentsource.md)
- [availableSources](avfoundation/avcapturetimecodegenerator/availablesources.md)
- [frameCountSource](avfoundation/avcapturetimecodegenerator/framecountsource.md)
- [startSynchronization(source:)](avfoundation/avcapturetimecodegenerator/startsynchronization(source:).md)