---
title: timeIntervalSinceStart
framework: healthkit
role: symbol
role_heading: Instance Property
path: healthkit/hkheartbeatseriesquerydescriptor/heartbeat/timeintervalsincestart
---

# timeIntervalSinceStart

## Declaration

```swift
let timeIntervalSinceStart: TimeInterval
```

## See Also

### Accessing Heartbeat Data

- [precededByGap](healthkit/hkheartbeatseriesquerydescriptor/heartbeat/precededbygap.md)