---
title: allowedUnits
framework: swift
role: symbol
role_heading: Instance Property
path: swift/duration/unitsformatstyle/allowedunits
---

# allowedUnits

The units that may be included in the output string.

## Declaration

```swift
var allowedUnits: Set<Duration.UnitsFormatStyle.Unit>
```

## See Also

### Working with units

- [Duration.UnitsFormatStyle.Unit](swift/duration/unitsformatstyle/unit.md)
- [maximumUnitCount](swift/duration/unitsformatstyle/maximumunitcount.md)
- [valueLengthLimits](swift/duration/unitsformatstyle/valuelengthlimits.md)