# Duration.UnitsFormatStyle.FractionalPartDisplayStrategy A strategy that determines how to format the fractional part of a duration if the allowed units can’t represent it exactly. ``` struct FractionalPartDisplayStrategy ``` ## Overview When using a [`Duration.UnitsFormatStyle`](/documentation/Swift/Duration/UnitsFormatStyle), specifying a `FractionalPartDisplayStrategy` enables you to decide how to balance between accuracy and verbosity when you’re not using all of the available units (hours, minutes, and seconds). When a formatted duration has a fractional part, you can hide it entirely, round the unit up or down while hiding the fractional part, or show the unit with a fraction. The following example shows different display strategies used with a duration of 1 hour, 15 minutes and unit format styles that only show hours. ``` let duration = Duration.seconds(75 * 60) // 1 minute, 15 seconds let hide = duration.formatted( .units(allowed: [.hours], width: .wide, fractionalPart: .hide)) // 1 hour let hideRounded = duration.formatted( .units(allowed: [.hours], width: .wide, fractionalPart: .hide(rounded:.up))) // 2 hours let show = duration.formatted( .units(allowed: [.hours], width: .wide, fractionalPart: .show(length: 2))) // 1.25 hours ``` ## Topics ### Creating a fractional part display strategy [`init(lengthLimits: Range, roundingRule: FloatingPointRoundingRule, roundingIncrement: Double?)`](/documentation/Swift/Duration/UnitsFormatStyle/FractionalPartDisplayStrategy/init(lengthLimits:roundingRule:roundingIncrement:)) Creates a fractional part display strategy that uses the provided behaviors. ### Using common strategies [`static var hide: Duration.UnitsFormatStyle.FractionalPartDisplayStrategy`](/documentation/Swift/Duration/UnitsFormatStyle/FractionalPartDisplayStrategy/hide) A display strategy that hides any fractional part by truncating it. [`static func hide(rounded: FloatingPointRoundingRule) -> Duration.UnitsFormatStyle.FractionalPartDisplayStrategy`](/documentation/Swift/Duration/UnitsFormatStyle/FractionalPartDisplayStrategy/hide(rounded:)) Creates a display strategy that hides any fractional part rounding the unit value. [`static func show(length: Int, rounded: FloatingPointRoundingRule, increment: Double?) -> Duration.UnitsFormatStyle.FractionalPartDisplayStrategy`](/documentation/Swift/Duration/UnitsFormatStyle/FractionalPartDisplayStrategy/show(length:rounded:increment:)) Creates a display strategy that shows a fractional part. ### Working with strategy properties [`var minimumLength: Int`](/documentation/Swift/Duration/UnitsFormatStyle/FractionalPartDisplayStrategy/minimumLength) The minimum length of the fractional part, if shown. [`var maximumLength: Int`](/documentation/Swift/Duration/UnitsFormatStyle/FractionalPartDisplayStrategy/maximumLength) The maximum length of the fractional part, if shown. [`var roundingIncrement: Double?`](/documentation/Swift/Duration/UnitsFormatStyle/FractionalPartDisplayStrategy/roundingIncrement) A multiple by which a formatter rounds a fractional part of a duration. [`var roundingRule: FloatingPointRoundingRule`](/documentation/Swift/Duration/UnitsFormatStyle/FractionalPartDisplayStrategy/roundingRule) The rule for rounding a unit up or down if it has a fractional part. ### Encoding and decoding ### Hashing ### Comparing fractional part display strategies ## Relationships ### Conforms To [`Equatable`](/documentation/Swift/Equatable) [`SendableMetatype`](/documentation/Swift/SendableMetatype) [`Sendable`](/documentation/Swift/Sendable) [`Hashable`](/documentation/Swift/Hashable) [`Encodable`](/documentation/Swift/Encodable) [`Decodable`](/documentation/Swift/Decodable) --- 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)