gistfile1.swift

public extension NSDate {
	var calendarComponents: NSDateComponents {
		get {
			//let componentFlags: NSCalendarUnit = NSCalendarUnit(CalendarUnitEra)
			let componentFlags = NSCalendarUnit(UInt.max)
			return NSDate.currentCalendar().components(componentFlags, fromDate:self)
		}
	}

	var hour: Int {
		get {
			return calendarComponents.hour
		}
		mutating set (newHours) {
			self += Double(newHours)
		}
	}
}


func += (inout date: NSDate, timeInterval: Double) {
	date = date + timeInterval
}