---
title: "init(start:duration:)"
framework: foundation
role: symbol
role_heading: Initializer
path: "foundation/dateinterval/init(start:duration:)"
---

# init(start:duration:)

Initializes an interval with the specified start date and duration.

## Declaration

```swift
init(start: Date, duration: TimeInterval)
```

## Discussion

Discussion Precondition: duration >= 0

## See Also

### Creating a Date Interval

- [init()](foundation/dateinterval/init().md)
- [init(start:end:)](foundation/dateinterval/init(start:end:).md)