NSDate extension that makes easier to operate with NSDate, its built on the top functionalities of SWIFT to give the best experience and safety.

Features

• Compare dates using common compare operators: >, >=, <, <=
• Get interval between dates using that custom operator >-<
• Add/remove date components by using aritmethic operators: +, -, +=, -=
• Curryed functions
• Use subscripting to access single or group of date components

Requirements

• iOS7 or above
• Swift 1.2

Usage

Create dates directly from components

Embracing default values for parameters in SWIFT is possible to omit hour,minute and second arguments while creating a date, those will be set to 0.

let d1 = NSDate.dateWithTime(hour: 22)
let d2 = NSDate.dateWithTime(hour: 22, minutes:10)
let d3 = NSDate.dateWithComponents(year: 1978, month: 5, day: 24, hour: 12);

Use subscripting to read components

Using subsscript is possible to obtain only one component or group of componets in a touple of optionals (hour:Int?, minute:Int?, second:Int?, day:Int?, month:Int?, year:Int?). Values not requested are retuned as nil.

let d3 = NSDate.dateWithComponents(year: 1978, month: 5, day: 24, hour: 12);
let val = d3![.Months] // 5
let tupla = d3![.Hours,.Days,.Months] // (hour:12, nil, nil, day:24, month:5, nil)
println("Hour:\(tupla.hour!) Days:\(tupla.day!) Month:\(tupla.month!)")

Add/Remove date componets using common plus and minus operator

Thanks to the Int extension is possible to add (or remove) seconds, minutes, hours days, weeks, months and years by simply those commands.

let date = NSDate()
let dateMinusOneDay = date - 1.days
let datePlustTwoHours = date + 2.hours

Compare Dates

Compare dates using common compare operators: >, >=, <, <=

let now = NSDate()
let now2 = NSDate()
let answer = now == now2
println("\(answer)") // true

let laterDate = now2 + 1.days
let answer = laterDate! > now
println("\(answer)") // true
        
let earlierDate = now2 - 2.days
let answer2 = earlierDate! < now
println("\(answer2)") // true

Curried functions

You can easily use the provide curried functions dateByAddingCalendarComponent and dateByRemovingCalendarComponent to add an remove calendar units

let arrayDate = [NSDate(),NSDate.dateByAddingCalendarComponent(timeUnitMeasure: .Days)(date: NSDate(),value: 4)]
let addMonth = NSDate.dateByAddingCalendarComponent(timeUnitMeasure: .Months)
let mapArray = arrayDate.map{addMonth(date:$0!,value:3)}

Install

Just copy AFDateSwiftExtension.swift `file in your project.

Thanks

Even if I was already working on that extension I must tell the article from Karatal blog has really inspired me

License

AFSwiftDateExtension is released under MIT license. See LICENSE for details.