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

# timeRange

The time range of the reported observation.

## Declaration

```swift
var timeRange: CMTimeRange? { get }
```

## Discussion

Discussion When evaluating a sequence of image buffers, use this property to determine each observation’s start time and duration. If a request doesn’t support time ranges, or the time range is unknown, the value of this property is nil.

## See Also

### Inspecting an observation

- [uuid](vision/visionobservation/uuid.md)
- [confidence](vision/visionobservation/confidence.md)
- [description](vision/visionobservation/description.md)
- [originatingRequestDescriptor](vision/visionobservation/originatingrequestdescriptor.md)
- [RequestDescriptor](vision/requestdescriptor.md)