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Backport of iOS 15 formatting api
.package(url: "https://github.com/simonsalomons/BPFormatted.git", from: "0.0.5")


This is a back-port of the .formatted API in Foundation that was introduced at WWDC '21 for iOS 15, macOS 12.0, tvOS 15.0, and watchOS 8.0.

Most developers cannot start developing their apps from those platforms and upwards.

But now they can! This package provides the same nice api for projects starting at iOS 9.0, macOS 10.10, tvOS 9.0 and watchOS 2.0!!!


To provide the exact same api with the exact same results as Apple's Foundation api.


What's already available and what's to come.

  • ☑ Date
  • ☑ ISO8601 (iOS 10, macOS 10.12, watchOS 3, tvOS 10)
  • ☑ DateInterval
  • ☑ Relative Dates (iOS 15, macOS 10.15, watchOS 6, tvOS 13)
  • ☐ DateComponents
    • ☐ Components
    • ☐ Time Duration
  • ☑ Number
    • ☑ Decimal
    • ☑ Float
    • ☑ Integer
  • ☐ Currency
    • ☐ Decimal
    • ☐ Float
    • ☐ Integer
  • ☐ Percent
    • ☐ Decimal
    • ☐ Float
    • ☐ Integer
  • ☐ Measurement
  • ☐ List
  • ☐ PersonNameComponent
  • ☐ RelativeDate
  • ☐ ByteCount
  • ☐ String parsing (maybe)

How to use

The same API as in Apple's Foundation framework, but prefixed with bp.

// Apple's Foundation
// BPFormatted

You will get automatic compiler warnings if you try to use this framework when your minimum deployment already allows you to use Apple's official API.

All possibilities are not yet fully documented by Apple. Your best bet right now is to watch What's new in Foundation (WWDC 2021) starting at 14:30.

Known issues

  • Date
    • Requesting .quarter(.narrow) in Apple's api results in "2nd Quarter" while it should be "2". My implementation does not do this. This has been reported in FB9165857
    • Requesting .localizedGMT(.short) in Apple's api results in "" while it should be something like "GMT+2" My implementation does not do this. This has been reported in FB9165947
  • Date Interval
    • All locales except en-US return a 4-digit year. Something seems not quite right yet in Apple's implementation
  • Number:
    • .rounded() is currently not implemented because I'm unable to get the same results as Apple
    • .notation(.compactName) is excluded because this is something new to Foundation and it cannot be replicated with a NumberFormatter
    • Some combinations of specifiers result in different results compared to Apple's implementation... but my implementation does not lose precision while Apple's does... What's up with that? You can check the tests in DecimalTests.swift to see which combinations.


  • Since the current release of Foundation this is based on is still in bèta, everything is still subject to change.
  • To use the same syntax as the new API, you need to use Swift 5.5, otherwise, a longer form will be necessary.
// Swift 5.5
// Swift 5.x
  • This is my first open source project. If you have any suggestions/improvements, I am open-minded.



dependencies: [
    .package(url: "https://github.com/simonsalomons/BPFormatted.git", .upToNextMajor(from: "0.0.1"))




Stars: 3
Last commit: 2 weeks ago

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iOS Software Engineer @ Perry Street Software
Perry Street Software is Jack’d and SCRUFF. We are two of the world’s largest gay, bi, trans and queer social dating apps on iOS and Android. Our brands reach more than 20 million members worldwide so members can connect, meet and express themselves on a platform that prioritizes privacy and security. We invest heavily into SwiftUI and using Swift Packages to modularize the codebase.

Release Notes

2 weeks ago

Integer and Float number formatting

Swiftpack is being maintained by Petr Pavlik | @ptrpavlik | @swiftpackco | API