If you work with a lot of dates and times in your apps, here’s a cool extension I wrote that allows you to quickly add hours, days, weeks or months to any date.

NSDate+.swift

// This work is licensed under a Creative Commons Attribution-ShareAlike 4.0 International License.
// Created by Fares K. Alaboud on 13/01/2016.
// faresalaboud.me

import UIKit

extension NSDate {
    
    func addToDate(measurement: DateComponent, number: Int) -> NSDate {
        let dateComponents = NSDateComponents()
        let CurrentCalendar = NSCalendar.currentCalendar()
        let CalendarOption = NSCalendarOptions()

        switch(measurement) {
        case DateComponent.Hour:
            dateComponents.hour = number
            break
        case DateComponent.Day:
            dateComponents.day = number
            break
        case DateComponent.Week:
            dateComponents.day = (number * 7)
            break
        case DateComponent.Month:
            dateComponents.month = number
            break
        }
        
        let newDate = CurrentCalendar.dateByAddingComponents(dateComponents, toDate: NSDate(), options: CalendarOption)
        return newDate!
    }
}

enum DateComponent {
    case Hour
    case Day
    case Week
    case Month
}

// Example:
// var now = NSDate()
// var tomorrow = now.addToDate(DateComponent.Day, number: 1)

Thank you for this. Really helpful :)