# formatted(_:referenceDate:) Formats the subscription period using a format style that takes a duration as an input. ``` func formatted(_ format: S, referenceDate: Date = .now) -> S.FormatOutput where S : FormatStyle, S.FormatInput == Duration ``` ## Parameters `format` A format style that has a duration as an input. `referenceDate` The starting date of the subscription period. The default value is . --- Copyright © 2026 Apple Inc. All rights reserved. | [Terms of Use](https://www.apple.com/legal/internet-services/terms/site.html) | [Privacy Policy](https://www.apple.com/privacy/privacy-policy)