NSDate extension

extension NSDate {
    
    func isGreaterThanDate(dateToCompare : NSDate) -> Bool {
        return self.compare(dateToCompare) == NSComparisonResult.OrderedDescending
    }
    
    
    func isLessThanDate(dateToCompare : NSDate) -> Bool {
        return self.compare(dateToCompare) == NSComparisonResult.OrderedAscending
    }
    
    func addDays(daysToAdd : Int) -> NSDate
    {
        let secondsInDays : NSTimeInterval = Double(daysToAdd) * 60 * 60 * 24

        return self.dateByAddingTimeInterval(secondsInDays)
    }
    
    
    func addHours(hoursToAdd : Int) -> NSDate
    {
        let secondsInHours : NSTimeInterval = Double(hoursToAdd) * 60 * 60

        return self.dateByAddingTimeInterval(secondsInHours)
    }
}