---
title: AttributeScopes.FoundationAttributes.DurationFieldAttribute.Field.nanoseconds
framework: foundation
role: symbol
role_heading: Case
path: foundation/attributescopes/foundationattributes/durationfieldattribute/field/nanoseconds
---

# AttributeScopes.FoundationAttributes.DurationFieldAttribute.Field.nanoseconds

## Declaration

```swift
case nanoseconds
```