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# operatingSystemVersion

A string that identifies the operating system used to save a sample.

```
var operatingSystemVersion: OperatingSystemVersion { get }
```

## Discussion

For samples saved on watchOS 4.0, HealthKit sets the operating system property to `{4, 0, 0}`.

> Note:
> For samples saved using older versions of HealthKit, the system approximates the operating system. For instance, HealthKit marks samples saved after iOS 8.0 but before 8.2 as `{8, 0, 0}`. HealthKit marks samples saved after 8.2 but before 9.0  as `{8, 2, 0}`.

## Topics

### Constants

[`let HKSourceRevisionAnyOperatingSystem: OperatingSystemVersion`](/documentation/HealthKit/HKSourceRevisionAnyOperatingSystem)

A constant that matches any operating system.


---

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