---
title: previousZoneDuration
framework: healthkit
role: symbol
role_heading: Instance Property
path: healthkit/hkliveworkoutzoneupdate/previouszoneduration
---

# previousZoneDuration

The new zone duration that has just been entered, or nil if no zone is active.

## Declaration

```swift
@nonobjc final var previousZoneDuration: HKWorkoutZoneDuration? { get }
```