---
title: deltaBetweenPreferredStartTimes
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/deltabetweenpreferredstarttimes
---

# deltaBetweenPreferredStartTimes

The delta between successive preferred start times.

## Declaration

```swift
var deltaBetweenPreferredStartTimes: CMTime
```

## Discussion

Discussion Add integer multiples of this delta to clockStartTime and hostClockStartTime to calculate near-future preferred start times.