fechas - string to date swift

Swift: imprime todas las fechas entre dos NSDate()

Question

Estoy creando una fecha usando NSDateComponents() :

let startDate = NSDateComponents()
startDate.year = 2015
startDate.month = 9
startDate.day = 1
let calendar = NSCalendar.currentCalendar()
let startDateNSDate = calendar.dateFromComponents(startDate)!

... ahora quiero imprimir todas las fechas desde el día de startDate hasta el día de hoy, NSDate() . Ya intenté jugar con NSCalendarUnit, pero solo muestra la diferencia completa, no las fechas individuales entre.

let unit: NSCalendarUnit = [.Year, .Month, .Day, .Hour, .Minute, .Second]
let diff = NSCalendar.currentCalendar().components(unit, fromDate: startDateNSDate, toDate: NSDate(), options: [])

¿Cómo puedo imprimir todas las fechas entre dos NSDates?

Answer 1

Tu código deseado se vuelve como

    let startDate = NSDateComponents()
    startDate.year = 2015
    startDate.month = 9
    startDate.day = 1
    let calendar = NSCalendar.currentCalendar()
    let startDateNSDate = calendar.dateFromComponents(startDate)!


    var offsetComponents:NSDateComponents = NSDateComponents();
    offsetComponents.day = 1
    var nd:NSDate = startDateNSDate;

    println(nd)
    while nd.timeIntervalSince1970 < NSDate().timeIntervalSince1970 {
        nd = calendar.dateByAddingComponents(offsetComponents, toDate: nd, options: nil)!;
            println(nd)


    }

Answer 2

Simplemente agregue una unidad de un día a la fecha hasta que llegue a la fecha actual (código Swift 2):

var date = startDateNSDate // first date
let endDate = NSDate() // last date

// Formatter for printing the date, adjust it according to your needs:
let fmt = NSDateFormatter()
fmt.dateFormat = "dd/MM/yyyy"

// While date <= endDate ...
while date.compare(endDate) != .OrderedDescending {
    print(fmt.stringFromDate(date))
    // Advance by one day:
    date = calendar.dateByAddingUnit(.Day, value: 1, toDate: date, options: [])!
}

Actualización para Swift 3:

var date = startDate // first date
let endDate = Date() // last date

// Formatter for printing the date, adjust it according to your needs:
let fmt = DateFormatter()
fmt.dateFormat = "dd/MM/yyyy"

while date <= endDate {
    print(fmt.string(from: date))
    date = calendar.date(byAdding: .day, value: 1, to: date)!
}

Answer 3

Estoy usando este enfoque (Swift 3):

import Foundation

class Dates {
    static func printDatesBetweenInterval(_ startDate: Date, _ endDate: Date) {
        var startDate = startDate
        let calendar = Calendar.current

        let fmt = DateFormatter()
        fmt.dateFormat = "yyyy-MM-dd"

        while startDate <= endDate {
            print(fmt.string(from: startDate))
            startDate = calendar.date(byAdding: .day, value: 1, to: startDate)!
        }
    }

    static func dateFromString(_ dateString: String) -> Date {
        let dateFormatter = DateFormatter()
        dateFormatter.dateFormat = "yyyy-MM-dd"

        return dateFormatter.date(from: dateString)!
    }
}

y lo llamo así:

Dates.printDatesBetweenInterval(Dates.dateFromString("2017-01-02"), Dates.dateFromString("2017-01-9"))

El resultado es:

2017-01-02
2017-01-03
2017-01-04
2017-01-05
2017-01-06
2017-01-07
2017-01-08
2017-01-09

Answer 4

Usando la extensión:

extension Date{

func generateDatesArrayBetweenTwoDates(startDate: Date , endDate:Date) ->[Date]
{
    var datesArray: [Date] =  [Date]()
    var startDate = startDate
    let calendar = Calendar.current

    let fmt = DateFormatter()
    fmt.dateFormat = "yyyy-MM-dd"

    while startDate <= endDate {
        datesArray.append(startDate)
        startDate = calendar.date(byAdding: .day, value: 1, to: startDate)!

    }
    return datesArray
}
}

Uso:

let datesBetweenArray = Date().generateDatesArrayBetweenTwoDates(startDate: Your Start Date Object , endDate: Your End Date Object)

Answer 5

Lo mismo pero más bonito:

extension Date {

  func allDates(till endDate: Date) -> [Date] {
    var date = self
    var array: [Date] = []
    while date <= endDate {
      array.append(startDate)
      date = Calendar.current.date(byAdding: .day, value: 1, to: startDate)!
    }
    return array
  }
}

Cómo obtener todas las fechas para los próximos 20 días:

if let date = Calendar.current.date(byAdding: .day, value: 20, to: Date()) {
  print(Date().allDates(till: date))
}