---
title: presentationTimeStamp
framework: coremedia
role: symbol
role_heading: Instance Property
path: coremedia/cmreadysamplebuffer/presentationtimestamp-7ea7z
---

# presentationTimeStamp

Numerically earliest sample presentation timestamp in the sample buffer.

## Declaration

```swift
var presentationTimeStamp: CMTime { get }
```

## Discussion

Discussion For in-presentation-order samples, this is the presentation timestamp of the first sample. For out-of-presentation-order samples, this is the presentation timestamp of the sample that will be presented first, which is not necessarily the first sample in the buffer. Returns invalid if sampleTimings is empty or contains invalid presentationTimeStamp.