---
title: timeSinceSampleStart
framework: healthkit
role: symbol
role_heading: Instance Property
path: healthkit/hkelectrocardiogram/voltagemeasurement/timesincesamplestart
---

# timeSinceSampleStart

The time of the measurement relative to the sample’s start time.

## Declaration

```swift
var timeSinceSampleStart: TimeInterval { get }
```

## See Also

### Accessing Data

- [quantity(for:)](healthkit/hkelectrocardiogram/voltagemeasurement/quantity(for:).md)