NSDateUtils.swift

import Foundation

extension NSDate {
    func coolDate() -> String {
        if self.minutesFromNow() < 1 {
            return "Now"
        } else if self.minutesFromNow() < 60 {
            return numberWithSuffix(self.minutesFromNow(), "m", false)
        } else if self.hoursFromNow() < 24 {
            return numberWithSuffix(self.hoursFromNow(), "h", false)
        } else if self.daysFromNow() < 8 {
            return numberWithSuffix(self.daysFromNow(), "d", false)
        } else if self.weeksFromNow() < 4 {
            return numberWithSuffix(self.weeksFromNow(), "w", false)
        } else if self.monthsFromNow() < 12 {
            return numberWithSuffix(self.monthsFromNow(), "M", false)
        } else {
            return numberWithSuffix(self.yearsFromNow(), "y", false)
        }
    }
    
    func minutesFromNow() -> Int { return self.timeFrom(60) }
    
    func hoursFromNow() -> Int { return self.timeFrom(3600) }
    
    func daysFromNow() -> Int { return self.timeFrom(86400) }
    
    func weeksFromNow() -> Int { return self.timeFrom(648000) }
    
    func monthsFromNow() -> Int { return self.timeFrom(2592000) }
    
    func yearsFromNow() -> Int { return self.timeFrom(31536000) }
    
    func timeFrom(timeUnit: Double) -> Int {
        return Int(self.timeIntervalSinceNow / timeUnit) * (self.timeIntervalSinceNow < 0 ? -1 : 1)
    }
}