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1. NSCalendar.numberOfDaysBetweenStartDate(_:andEndDate:)

   extension NSCalendar {
       func numberOfDaysBetweenStartDate(startDate: NSDate, andEndDate endDate: NSDate) -> Int {
           let startDay = self.ordinalityOfUnit(.Day, inUnit: NSCalendarUnit.Era, forDate: startDate)
           let endDay = self.ordinalityOfUnit(.Day, inUnit: NSCalendarUnit.Era, forDate: endDate)
           return endDay - startDay
       }
   }