# rateAndAnchorTime(relativeTo:) Queries the relative rate of one timebase or clock relative to another timebase or clock, and the times of each timebase or clock at which the relative rate went into effect. ``` func rateAndAnchorTime(relativeTo clockOrTimebase: T) throws -> (rate: Double, anchorTime: CMTime, referenceTime: CMTime) where T : CMSyncProtocol ``` ## Parameters `clockOrTimebase` The clock to compare to. --- 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)