---
title: "appendInterpolation(standaloneMonth:)"
framework: foundation
role: symbol
role_heading: Instance Method
path: "foundation/date/formatstring/stringinterpolation/appendinterpolation(standalonemonth:)"
---

# appendInterpolation(standaloneMonth:)

## Declaration

```swift
mutating func appendInterpolation(standaloneMonth: Date.FormatStyle.Symbol.StandaloneMonth)
```