# DateFeatureExtractor A time and date feature extractor. ``` struct DateFeatureExtractor where Scalar : BinaryFloatingPoint ``` ## Overview This transformer takes a and extracts floating-point feature values according to the features parameter. Every feature value is roughly between -0.5 and 0.5. All date calculations are based on a , which defaults to . ## Topics ### Creating a data feature extractor [`init(features: DateFeatures, calendar: Calendar)`](/documentation/CreateMLComponents/DateFeatureExtractor/init(features:calendar:)) Creates a date feature extractor. ### Applying a data feature extractor [`func applied(to: Date, eventHandler: EventHandler?) -> [Scalar]`](/documentation/CreateMLComponents/DateFeatureExtractor/applied(to:eventHandler:)) Extracts features of a particular date. ### Inspecting a data feature extractor [`let calendar: Calendar`](/documentation/CreateMLComponents/DateFeatureExtractor/calendar) The calendar. [`let features: DateFeatures`](/documentation/CreateMLComponents/DateFeatureExtractor/features) The date and time features. ## Relationships ### Conforms To [`Sendable`](/documentation/Swift/Sendable) [`Transformer`](/documentation/CreateMLComponents/Transformer) [`Escapable`](/documentation/Swift/Escapable) [`Copyable`](/documentation/Swift/Copyable) [`Decodable`](/documentation/Swift/Decodable) [`Encodable`](/documentation/Swift/Encodable) [`SendableMetatype`](/documentation/Swift/SendableMetatype) --- 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)