NEW: Master Swift design patterns with my latest book! >>

How to specify your own date format with Codable and JSONEncoder

Written by Paul Hudson    @twostraws

When using JSONEncoder to encode dates, there are a handful of built-in date formats you can choose from. If none of them fit your needs, why not make your own? You can configure a DateFormatter using whatever date and time format you want, then pass that to the JSONEncoder as its dateEncodingStrategy property, like this:

let formatter = DateFormatter()
formatter.dateStyle = .full
formatter.timeStyle = .full
encoder.dateEncodingStrategy = .formatted(formatter)

That converts any Date properties to be the fullest possible string for your locale, e.g. "Monday, February 5, 2018 at 9:28:10 PM Greenwich Mean Time”.

Available from iOS 8.0

Did this solution work for you? Please pass it on!

Other people are reading…

About the Swift Knowledge Base

This is part of the Swift Knowledge Base, a free, searchable collection of solutions for common iOS questions.

Upgrade to the premium experience

Get all 40 projects in PDF and ePub, plus exclusive content that will take your Swift learning to the next level – buy the Hacking with Swift book today!

Click here to visit the Hacking with Swift store >>