--- title: "TN3130: Changes to EventKit in macOS Ventura 13" framework: technotes role: article role_heading: Article path: technotes/tn3130-changes-to-eventkit-in-macos13-ventura --- # TN3130: Changes to EventKit in macOS Ventura 13 Test your apps against EventKit API changes in macOS Ventura 13. ## Overview Overview In macOS Ventura 13, the EventKit framework has seen significant changes. This document highlights some of the notable changes. To learn about related changes in iOS 16, see TN3132: Changes to EventKit and EventKitUI in iOS 16. For apps running on systems prior to macOS Ventura 13, the legacy behavior remains in place when using EventKit. When you run your app on macOS Ventura 13, and have built it with Xcode 14 and linked against the macOS 13 SDK, you may see behavior that you are unfamiliar with when using EventKit. To identify these changes in behavior, thoroughly test your app for each major OS version it supports. Confirm that your implementation of EventKit behaves as you expect in each OS version and update your code where needed. If you notice an unexpected behavior in EventKit, report it using Feedback Assistant. EKCalendar The inherited initializer init() throws an exception when attempting to create a new calendar. Use init(for:eventStore:) instead. let calendar = EKCalendar(for: .event, eventStore: eventStore) In the legacy behavior, this inherited initializer returns an unusable EKCalendar object. EKCalendarItem Fetching recurrence rules The recurrenceRules property returns an empty array if the calendar item doesn’t have any recurrence rules. In the legacy behavior, recurrenceRules returns nil if the calendar item doesn’t have any recurrence rules. Updating time zones Changing the time zone of an event no longer changes the absolute time at which it occurs. EKEvent Creating events The inherited initializer init() throws an exception when attempting to create a new event. Use init(eventStore:) to create new events. In the legacy behavior, this inherited initializer returns an unusable EKEvent object. Event identifiers The eventIdentifier property now returns identifiers in a new format. The previous identifier format will continue to work. End date of all-day events The endDate property of all-day events returns a time of 11:59:59 PM on the last day of this event. Event title: Marathon Start date: June 18, 2022 at 12:00:00 AM PDT End date: June 18, 2022 at 11:59:59 PM PDT In the legacy behavior, this property returns a time of 12:00:00 AM on the day after the event. Event title: Marathon Start date: June 18, 2022 at 12:00:00 AM PDT End date: June 19, 2022 at 12:00:00 AM PDT EKEventStore Accessing sources The sources property now contains delegate sources. // Fetch all sources associated with the event store. let sources = eventStore.sources sources.forEach { source in // Let's check whether source is a delegate event source. let name = (source.isDelegate) ? "Delegate Source" : "Source" print("\(name): \(source.title)") } // Prints "Source: iCloud" // Prints "Delegate Source: Calculus Office Hours" Fetching events events(matching:) and enumerateEvents(matching:using:) no longer necessarily return events sorted by start date. Accessing calendar events The calendarItem(withIdentifier:), calendarItems(withExternalIdentifier:), and event(withIdentifier:) methods may return different occurrences of an event or reminder with a given identifier in some cases. For instance, when the first occurrence of a recurring event was modified and the specified identifier refers to this occurrence. In this case, use the given identifier to fetch the unmodified version of the event’s first occurrence. Committing changes When you call saveCalendar(_:commit:), removeCalendar(_:commit:), save(_:span:commit:), remove(_:span:commit:), save(_:commit:), or remove(_:commit:) methods with the commit parameter set to true, EKEventStore attempts to immediately save and commit your changes to the event store. If the commit fails, EKEventStore automatically rolls back all changes that been saved but aren’t yet committed to the event store. In the legacy behavior, uncommitted objects remain saved in the event store. EKReminder The inherited initializer init() throws an exception when attempting to create a new reminder. Use init(eventStore:) instead. let reminder = EKReminder(eventStore: eventStore) In the legacy behavior, this inherited initializer returns an unusable EKReminder object. EKSource The isDelegate property indicates whether the source is an event source delegated to the user. Revision History 2022-08-16 First published. ## See Also ### Latest - [TN3210: Optimizing your app for iPhone Mirroring](technotes/tn3210-optimizing-your-app-for-iphone-mirroring.md) - [TN3211: Resolving SwiftUI source incompatibilities for State and ContentBuilder](technotes/tn3211-resolving-swiftui-source-incompatibilities-for-state-and-contentbuilder.md) - [TN3212: Adopting gesture recognizers for Sidecar touch support](technotes/tn3212-adopting-gesture-recognizers-for-sidecar-touch-support.md) - [TN3208: Preparing your app’s launch screen to meet App Store requirements](technotes/tn3208-preparing-your-apps-launch-screen-to-meet-app-store-requirements.md) - [TN3205: Low-latency communication with RDMA over Thunderbolt](technotes/tn3205-low-latency-communication-with-rdma-over-thunderbolt.md) - [TN3206: Updating Apple Pay certificates](technotes/tn3206-updating-apple-pay-certificates.md) - [TN3179: Understanding local network privacy](technotes/tn3179-understanding-local-network-privacy.md) - [TN3190: USB audio device design considerations](technotes/tn3190-usb-audio-device-design-considerations.md) - [TN3194: Handling account deletions and revoking tokens for Sign in with Apple](technotes/tn3194-handling-account-deletions-and-revoking-tokens-for-sign-in-with-apple.md) - [TN3193: Managing the on-device foundation model’s context window](technotes/tn3193-managing-the-on-device-foundation-model-s-context-window.md) - [TN3115: Bluetooth State Restoration app relaunch rules](technotes/tn3115-bluetooth-state-restoration-app-relaunch-rules.md) - [TN3192: Migrating your iPad app from the deprecated UIRequiresFullScreen key](technotes/tn3192-migrating-your-app-from-the-deprecated-uirequiresfullscreen-key.md) - [TN3151: Choosing the right networking API](technotes/tn3151-choosing-the-right-networking-api.md) - [TN3111: iOS Wi-Fi API overview](technotes/tn3111-ios-wifi-api-overview.md) - [TN3191: IMAP extensions supported by Mail for iOS, iPadOS, and visionOS](technotes/tn3191-imap-extensions-supported-by-mail.md)