---
title: Date.FormatString.StringInterpolation
framework: foundation
role: symbol
role_heading: Structure
path: foundation/date/formatstring/stringinterpolation
---

# Date.FormatString.StringInterpolation

## Declaration

```swift
struct StringInterpolation
```

## Topics

### Initializers

- [init(literalCapacity:interpolationCount:)](foundation/date/formatstring/stringinterpolation/init(literalcapacity:interpolationcount:).md)

### Instance Methods

- [appendInterpolation(cyclicYear:)](foundation/date/formatstring/stringinterpolation/appendinterpolation(cyclicyear:).md)
- [appendInterpolation(day:)](foundation/date/formatstring/stringinterpolation/appendinterpolation(day:).md)
- [appendInterpolation(dayOfYear:)](foundation/date/formatstring/stringinterpolation/appendinterpolation(dayofyear:).md)
- [appendInterpolation(dayPeriod:)](foundation/date/formatstring/stringinterpolation/appendinterpolation(dayperiod:).md)
- [appendInterpolation(era:)](foundation/date/formatstring/stringinterpolation/appendinterpolation(era:).md)
- [appendInterpolation(hour:)](foundation/date/formatstring/stringinterpolation/appendinterpolation(hour:).md)
- [appendInterpolation(minute:)](foundation/date/formatstring/stringinterpolation/appendinterpolation(minute:).md)
- [appendInterpolation(month:)](foundation/date/formatstring/stringinterpolation/appendinterpolation(month:).md)
- [appendInterpolation(quarter:)](foundation/date/formatstring/stringinterpolation/appendinterpolation(quarter:).md)
- [appendInterpolation(second:)](foundation/date/formatstring/stringinterpolation/appendinterpolation(second:).md)
- [appendInterpolation(secondFraction:)](foundation/date/formatstring/stringinterpolation/appendinterpolation(secondfraction:).md)
- [appendInterpolation(standaloneMonth:)](foundation/date/formatstring/stringinterpolation/appendinterpolation(standalonemonth:).md)
- [appendInterpolation(standaloneQuarter:)](foundation/date/formatstring/stringinterpolation/appendinterpolation(standalonequarter:).md)
- [appendInterpolation(standaloneWeekday:)](foundation/date/formatstring/stringinterpolation/appendinterpolation(standaloneweekday:).md)
- [appendInterpolation(timeZone:)](foundation/date/formatstring/stringinterpolation/appendinterpolation(timezone:).md)
- [appendInterpolation(week:)](foundation/date/formatstring/stringinterpolation/appendinterpolation(week:).md)
- [appendInterpolation(weekday:)](foundation/date/formatstring/stringinterpolation/appendinterpolation(weekday:).md)
- [appendInterpolation(year:)](foundation/date/formatstring/stringinterpolation/appendinterpolation(year:).md)
- [appendInterpolation(yearForWeekOfYear:)](foundation/date/formatstring/stringinterpolation/appendinterpolation(yearforweekofyear:).md)
- [appendLiteral(_:)](foundation/date/formatstring/stringinterpolation/appendliteral(_:).md)

## Relationships

### Conforms To

- [Sendable](swift/sendable.md)
- [SendableMetatype](swift/sendablemetatype.md)
- [StringInterpolationProtocol](swift/stringinterpolationprotocol.md)