# interval A style for formatting a date interval. ``` static var interval: Date.IntervalFormatStyle { get } ``` ## Discussion Use this type property when the call point allows the use of [`Date.IntervalFormatStyle`](/documentation/Foundation/Date/IntervalFormatStyle). You typically do this when calling the method of a `Range`. The folllowing example uses [`interval`](/documentation/Foundation/FormatStyle/interval) to create a date interval string with specific styling of the day, month, and weekday components, omitting the year and time. ```swift if let today = Calendar.current.date(byAdding: .day, value: -120, to: Date()), let thirtyDaysBeforeToday = Calendar.current.date(byAdding: .day, value: -30, to: today) { // today: June 5, 2023 // thirtyDaysBeforeToday: May 6, 2023 // Create a Range. let last30days = thirtyDaysBeforeToday..