---
title: clockStartTime
framework: Core Media
role: symbol
role_heading: Instance Property
platforms: [iOS 27.0+, iPadOS 27.0+, Mac Catalyst 27.0+, macOS 27.0+, tvOS 27.0+, visionOS 27.0+, watchOS 27.0+]
path: coremedia/cmclock/starttimepattern/clockstarttime
---

# clockStartTime

The clock time of the next preferred start time.

## Declaration

```swift
var clockStartTime: CMTime
```