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

# appendInterpolation(cyclicYear:)

## Declaration

```swift
mutating func appendInterpolation(cyclicYear: Date.FormatStyle.Symbol.CyclicYear)
```