# range(of:start:interval:for:) Returns by reference the starting time and duration of a given calendar unit that contains a given date. ``` func range(of unit: NSCalendar.Unit, start datep: AutoreleasingUnsafeMutablePointer?, interval tip: UnsafeMutablePointer?, for date: Date) -> Bool ``` ## Parameters `unit` A calendar unit (see [`NSCalendar.Unit`](/documentation/Foundation/NSCalendar/Unit) for possible values). `datep` Upon return, contains the starting time of the calendar unit `unit` that contains the date `date` `tip` Upon return, contains the duration of the calendar unit `unit` that contains the date `date` `date` A date. ## Return Value if the starting time and duration of a unit could be calculated, otherwise . ## Discussion --- 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)