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

# appendInterpolation(timeZone:)

## Declaration

```swift
mutating func appendInterpolation(timeZone: Date.FormatStyle.Symbol.TimeZone)
```