---
title: day()
framework: healthkit
role: symbol
role_heading: Type Method
path: healthkit/hkunit/day()
---

# day()

Returns a HealthKit unit for measuring time in days.

## Declaration

```swift
class func day() -> Self
```

## Return Value

Return Value A HealthKit unit for measuring time in days.

## See Also

### Constructing time units

- [second()](healthkit/hkunit/second().md)
- [secondUnit(with:)](healthkit/hkunit/secondunit(with:).md)
- [minute()](healthkit/hkunit/minute().md)
- [hour()](healthkit/hkunit/hour().md)