---
title: timeRange
framework: vision
role: symbol
role_heading: Instance Property
path: vision/vnobservation/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 zero.

## See Also

### Evaluating Observations

- [confidence](vision/vnobservation/confidence.md)
- [VNConfidence](vision/vnconfidence.md)