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))
}