兩個 Date 對象之間的所有日期 (Swift)

Question

我正在使用NSDateComponents()創建一個日期。

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

...現在我想打印從startDate到今天的所有日期NSDate() 。 我已經嘗試過使用NSCalendarUnit ，但它只輸出整個差異，而不是之間的單個日期。

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

如何打印兩個Date對象之間的所有日期？

編輯 2019

與此同時，類的命名發生了變化—— NSDate現在只是Date 。 NSDateComponents現在被稱為DateComponents 。 NSCalendar.currentCalendar()現在只是Calendar.current 。

Answer 1

只需在日期中添加一個天單位，直到它到達當前日期（Swift 2 代碼）：

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: [])!
}

Swift 3更新：

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.current.date(byAdding: .day, value: 1, to: date)!
}

Answer 2

使用擴展：

extension Date {
    static func dates(from fromDate: Date, to toDate: Date) -> [Date] {
        var dates: [Date] = []
        var date = fromDate
        
        while date <= toDate {
            dates.append(date)
            guard let newDate = Calendar.current.date(byAdding: .day, value: 1, to: date) else { break }
            date = newDate
        }
        return dates
    }
}

用法：

let datesBetweenArray = Date.dates(from: Date(), to: Date())

Answer 3

同樣的事情，但更漂亮：

extension Date {

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

如何獲取接下來 20 天的所有日期：

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

Answer 4

你想要的代碼變得像

    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 5

這是打印兩個日期之間的所有日期的解決方案（Swift 4 代碼）

var mydates : [String] = []
var dateFrom =  Date() // First date
var dateTo = Date()   // Last date

// Formatter for printing the date, adjust it according to your needs:
let fmt = DateFormatter()
fmt.dateFormat = "yyy-MM-dd"
dateFrom = fmt.date(from: strstartDate)! // "2018-03-01"
dateTo = fmt.date(from: strendDate)! // "2018-03-05"


while dateFrom <= dateTo {
    mydates.append(fmt.string(from: dateFrom))
    dateFrom = Calendar.current.date(byAdding: .day, value: 1, to: dateFrom)!

}

print(mydates) // Your Result

輸出是：

["2018-03-01", "2018-03-02", "2018-03-03", "2018-03-04", "2018-03-05"]

Answer 6

我正在使用這種方法（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)!
    }
}

我這樣稱呼它：

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

輸出是：

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