No more pain with ugly NSDate code.

Time.swift

//
//  Time.swift
//  Playground
//
//  Created by Lukas Machalik on 17/03/15.
//  Copyright © 2015 Beers&Chill LLC. All rights reserved.
//

// Examples:
// let duration = 100.milliseconds
// let tomorrow = (Time.now + 24.hours).asDate
// let tomorrow2 = NSDate() + 24.hours
// let today = Time.now.asDate
// let yesterday = 24.hours.ago
// 
// var now = NSDate()
// now += 12.hours

import Foundation

typealias Time = Double

extension Time {
	var years: Time {
		return self * 365.days
	}
	var year: Time { return years }
	
	var days: Time {
		return self * 24.hours
	}
	var day: Time { return days }
	
	var hours: Time {
		return self * 60.minutes
	}
	var hour: Time { return hours }
	
	var minutes: Time {
		return self * 60.seconds
	}
	var minute: Time { return minutes }
	
	var seconds: Time {
		return self
	}
	var second: Time { return seconds }
	
	var milliseconds: Time {
		return self * 0.001
	}
	var millisecond: Time { return milliseconds }
	
	var ago: NSDate {
		return NSDate() - self
	}
	
	var asDate: NSDate {
		return NSDate(withTime: self)
	}
	
	static var minTime: Time {
		return NSDate.minTime
	}
	
	static var now: Time {
		return NSDate().asTime
	}
}

extension NSDate {
	var asTime: Time {
		return Time(timeIntervalSince1970)
	}
	
	class var minTime: Time {
		return distantPast().asTime
	}
	
	class var maxTime: Time {
		return distantFuture().asTime
	}
	
	convenience init(withTime time: Time) {
		self.init(timeIntervalSince1970: time)
	}
}

func +(left: NSDate, right: Time) -> NSDate {
	return left.dateByAddingTimeInterval(NSTimeInterval(right))
}

func -(left: NSDate, right: Time) -> NSDate {
	return left.dateByAddingTimeInterval(NSTimeInterval(-right))
}

func += (inout left: NSDate, right: Time) {
	left = left + right
}

func -= (inout left: NSDate, right: Time) {
	left = left - right
}