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Swift 3-encuentra el número de días calendario entre dos fechas

Question

La forma en que hice esto en Swift 2.3 fue:

    let currentDate         = NSDate()
    let currentCalendar     = NSCalendar.currentCalendar()

    var startDate : NSDate?
    var endDate   : NSDate?

   // The following two lines set the `startDate` and `endDate` to the start of the day

    currentCalendar.rangeOfUnit(.Day, startDate: &startDate, interval: nil, forDate: currentDate)
    currentCalendar.rangeOfUnit(.Day, startDate: &endDate, interval: nil, forDate: self)

    let intervalComps = currentCalendar.components([.Day], fromDate: startDate!, toDate: endDate!, options: [])

    print(intervalComps.day)

Ahora todo esto ha cambiado con Swift 3. Tengo que usar NSCalendar y NSDate al escribir constantemente casting con as , o encontrar la forma Swift 3 de hacerlo.

¿Cuál es la forma correcta de hacerlo en Swift 3?

Answer 1

Actualizado para Swift 3:

si desea imprimir la cantidad de días y la lista de días entre dos fechas de calendario, utilice el código simple a continuación;

// Declaración Variable:

var daysListArray = [String]()

// Definición de la función:

func printCountBtnTwoDates(mStartDate: Date, mEndDate: Date) -> Int {
    let calendar = Calendar.current
    let formatter = DateFormatter()
    var newDate = mStartDate
    daysListArray.removeAll()

    while newDate <= mEndDate {
        formatter.dateFormat = "yyyy-MM-dd"
        daysListArray.append(formatter.string(from: newDate))
        newDate = calendar.date(byAdding: .day, value: 1, to: newDate)!
    }
   // print("daysListArray: /(daysListArray)") // if you want to print list between start date and end date
    return daysListArray.count
}

// Para llamar a la función anterior:

    let count = self.printCountBtnTwoDates(mStartDate: your_start_date, mEndDate: your_end_date)
    print("count: /(count)") // date count

// ¡Disfruta de la codificación ...!

Answer 2

En Swift 4 hay una línea simple para obtener el número de días (o cualquier otro DateComponent) entre dos fechas:

let diffInDays = Calendar.current.dateComponents([.day], from: dateA, to: dateB).day

Answer 3

En Swift4 podemos obtener fácilmente el número de días entre dos fechas de calendario diferentes utilizando los códigos que se muestran a continuación.

El primero es la diferencia en días con la fecha actual.

let previousDate = "2017-03-01"
let currentDate = Date()
let dateFormatter = DateFormatter()
dateFormatter.dateFormat = "yyyy-MM-dd"
let previousDateFormated : Date? = dateFormatter.date(from: previousDate)
let difference = currentDate.timeIntervalSince(previousDateFormated!)
var differenceInDays = Int(difference/(60 * 60 * 24 ))
print(differenceInDays)

Continuando con el código anterior ... A continuación se muestra el número de días para dos fechas diferentes. El contenido de la fecha anterior se toma de la fecha anterior.

let futureDate = "2017-12-30"
let futureDateFormatted : Date? = dateFormatter.date(from: futureDate)
differenceInDays = (futureDateFormatted?.timeIntervalSince(previousDateFormated!))! / (60 * 60 * 24)

print(differenceInDays)

Answer 4

Encontré esto en un hilo diferente, pero finalmente fue la solución más simple para mí usando Swift 4:

let previousDate = ENTER DATE HERE
let now = Date()

let formatter = DateComponentsFormatter()
formatter.unitsStyle = .brief // May delete the word brief to let Xcode show you the other options
formatter.allowedUnits = [.month, .day, .hour]
formatter.maximumUnitCount = 1   // Show just one unit (i.e. 1d vs. 1d 6hrs)

let stringDate = formatter.string(from: previousDate, to: now)

Answer 5

Resulta que esto es mucho más simple de hacer en Swift 3:

extension Date {    

    func interval(ofComponent comp: Calendar.Component, fromDate date: Date) -> Int {

        let currentCalendar = Calendar.current

        guard let start = currentCalendar.ordinality(of: comp, in: .era, for: date) else { return 0 }
        guard let end = currentCalendar.ordinality(of: comp, in: .era, for: self) else { return 0 }

        return end - start
    }
}

Editar

La comparación de la ordinalidad de las dos fechas debe estar dentro de la misma era lugar del mismo year , ya que, naturalmente, las dos fechas pueden caer en años diferentes.

Uso

let yesterday = Date(timeInterval: -86400, since: Date())
let tomorrow = Date(timeInterval: 86400, since: Date())


let diff = tomorrow.interval(ofComponent: .day, fromDate: yesterday)
// return 2

Answer 6

Si alguien quiere hacerlo más específicamente siga los siguientes pasos

1.Agregue esta extensión de fecha

extension Date {
    /// Returns the amount of years from another date
func years(from date: Date) -> Int {
    return Calendar.current.dateComponents([.year], from: date, to: self).year ?? 0
}
/// Returns the amount of months from another date
func months(from date: Date) -> Int {
    return Calendar.current.dateComponents([.month], from: date, to: self).month ?? 0
}
/// Returns the amount of weeks from another date
func weeks(from date: Date) -> Int {
    return Calendar.current.dateComponents([.weekOfMonth], from: date, to: self).weekOfMonth ?? 0
}
/// Returns the amount of days from another date
func days(from date: Date) -> Int {
    return Calendar.current.dateComponents([.day], from: date, to: self).day ?? 0
}
/// Returns the amount of hours from another date
func hours(from date: Date) -> Int {
    return Calendar.current.dateComponents([.hour], from: date, to: self).hour ?? 0
}
/// Returns the amount of minutes from another date
func minutes(from date: Date) -> Int {
    return Calendar.current.dateComponents([.minute], from: date, to: self).minute ?? 0
}
/// Returns the amount of seconds from another date
func seconds(from date: Date) -> Int {
    return Calendar.current.dateComponents([.second], from: date, to: self).second ?? 0
}
/// Returns the amount of nanoseconds from another date
func nanoseconds(from date: Date) -> Int {
    return Calendar.current.dateComponents([.nanosecond], from: date, to: self).nanosecond ?? 0
}
/// Returns the a custom time interval description from another date
func offset(from date: Date) -> String {
    var result: String = ""
            if years(from: date)   > 0 { return "/(years(from: date))y"   }
            if months(from: date)  > 0 { return "/(months(from: date))M"  }
            if weeks(from: date)   > 0 { return "/(weeks(from: date))w"   }
    if seconds(from: date) > 0 { return "/(seconds(from: date))" }
            if days(from: date)    > 0 { result = result + " " + "/(days(from: date)) D" }
            if hours(from: date)   > 0 { result = result + " " + "/(hours(from: date)) H" }
            if minutes(from: date) > 0 { result = result + " " + "/(minutes(from: date)) M" }
           if seconds(from: date) > 0 { return "/(seconds(from: date))" }
    return ""
 }
}

2.Defínelo en global

 fileprivate var timer: Timer?

3.Llama este método en viewDidLoad o donde quieras

override func viewDidLoad() {
    super.viewDidLoad()
    self.getRemainingTime()
} 

4.Uso

fileprivate func getRemainingTime() {
    let dateFormatter = DateFormatter()
    dateFormatter.dateFormat = "yyyy-MM-dd HH:mm:ss"

    let startDate = "2018-06-02 10:11:12"
    let currentDate = dateFormatter.string(from: Date())

    if currentDate != startDate {
        timer = Timer.scheduledTimer(timeInterval: 1, target: self, selector: (#selector(calculateTime)), userInfo: nil, repeats: true)
        RunLoop.current.add(timer!, forMode: RunLoopMode.commonModes)
        timer?.fire()
    }
    else {
        self.timer?.invalidate()
        self.timer = nil
    }
}

func calculateTime() {
    let dateFormatter = DateFormatter()
    dateFormatter.dateFormat = "yyyy-MM-dd HH:mm:ss"

    let stdate : String = "2018-06-02 10:11:12"
    let startDate = dateFormatter.date(from: stdate)!

    let currentDate = Date()

    let strTimer : String = startDate.offset(from: currentDate)
    if !strTimer.isEmpty {
        let stDay: String = "/((Int(strTimer)! % 31536000) / 86400)"
        let stHour: String = "/((Int(strTimer)! % 86400) / 3600)"
        let stMin: String = "/((Int(strTimer)! % 3600) / 60)"
        let stSec: String = "/(Int(strTimer)! % 60)"
        yourLabelOutlet.text = "Start In :/(stDay) Days /(stHour) Hours /(stMin) Minutes /(stSec) Seconds"
    }

}

Funciona como Charm. Puedes usar cada cadena por separado para tu lado UI, disfruta

Answer 7

Versión Swift 4

let startDate = "2000-11-22"
let dateFormatter = DateFormatter()
dateFormatter.dateFormat = "yyyy-MM-dd"
let formatedStartDate = dateFormatter.date(from: startDate)
let currentDate = Date()
let components = Set<Calendar.Component>([.second, .minute, .hour, .day, .month, .year])
let differenceOfDate = Calendar.current.dateComponents(components, from: formatedStartDate!, to: currentDate)

print (differenceOfDate)

Impreso - año: 16 meses: 10 días: 19 horas: 12 minutos: 16 segundos: 42 isLeapMonth: false

date calendar swift4

Answer 8

private func calculateDaysBetweenTwoDates(start: Date, end: Date) -> Int {

    let currentCalendar = Calendar.current
    guard let start = currentCalendar.ordinality(of: .day, in: .era, for: start) else {
        return 0
    }
    guard let end = currentCalendar.ordinality(of: .day, in: .era, for: end) else {
        return 0
    }
    return end - start
}

Answer 9

private func days(actual day1:[Int],expect day2:[Int]) -> Int {

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

        let first = "/(day1[2])-/(day1[1])-/(day1[0])"
        let firstDate = dateFormatter.date(from:first)!
        let last = "/(day2[2])-/(day2[1])-/(day2[0])"
        let lastDate = dateFormatter.date(from:last)!

        let currentCalendar = NSCalendar.current

        let components = currentCalendar.dateComponents([.day], from: firstDate, to: lastDate)

        return components.day!
    }

Otro enfoque para comparar con componentes de día mes año

Uso:

Ingrese las fechas en el siguiente formato

[dd, mm, yyyy]
[9, 6, 2017]
[6, 6, 2017]