---
title: timeRange
framework: vision
role: symbol
role_heading: Instance Property
path: vision/documentobservation/timerange
---

# timeRange

Time in a video frame where the observation was detected.

## Declaration

```swift
let timeRange: CMTimeRange?
```

## Discussion

Discussion When evaluating a sequence of image buffers, use this property to determine each observation’s start time and duration.

## See Also

### Inspecting an observation

- [uuid](vision/documentobservation/uuid.md)
- [confidence](vision/documentobservation/confidence.md)
- [document](vision/documentobservation/document.md)