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Apple Developer Docs

Foundation / ProcessInfo / systemUptime

Contents

Declaration
Discussion
See Also

systemUptime

The amount of time the system has been awake since the last time it was restarted.

Declaration

var systemUptime: TimeInterval { get }

Discussion

important:

This API has the potential of being misused to access device signals to try to identify the device or user, also known as fingerprinting. Regardless of whether a user gives your app permission to track, fingerprinting is not allowed. When you use this API in your app or third-party SDK (an SDK not provided by Apple), declare your usage and the reason for using the API in your app or third-party SDK’s PrivacyInfo.xcprivacy file. For more information, including the list of valid reasons for using the API, see Describing use of required reason API.

See Also

Getting computer information

processorCount
activeProcessorCount
physicalMemory
isDeviceCertified(for:)
hasPerformanceProfile(_:)

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FoundationInstance Property

iOS 4.0+iPadOS 4.0+Mac Catalyst 13.1+macOS 10.6+tvOS 9.0+visionOS 1.0+watchOS 2.0+

Declaration
Discussion
See Also

Built on 2026-06-12 · Snapshot snapshot-20260612-beta.1 (macOS 27.0) · Commit fba13e1 · by @g-cqd · based on Apple Developer Documentation