swift：如何计算日期间隔（今天~指定日期）

Question

从当前间隔指定日期算起的天数，

例如：指定日期=15/01/2016，今天=03/01/2016
预期结果： 应显示 12 天后

Answer 1

您可以简单地使用 NSDateFormatter()... 和 NSCalendar()... 尝试这样的事情：

let start = "03/01/2016" 
let end = "15/01/2016"

let dateFormatter = NSDateFormatter()
dateFormatter.dateFormat = "dd/mm/yyyy"

let startDate:NSDate = dateFormatter.dateFromString(start)!
let endDate:NSDate = dateFormatter.dateFromString(end)!

let cal = NSCalendar.currentCalendar()
let unit:NSCalendarUnit = NSCalendarUnit.Day
let components = cal.components(unit, fromDate: startDate, toDate: endDate, options: [])

如果我理解错了，欢迎指正。最好的问候，亚历克斯

Answer 2

试试这个扩展：

extension NSDate{

    func relativeDaysFromToday()->String
    {
        let now = NSDate()

            let calendar = NSCalendar.currentCalendar()
            let unitFlags:NSCalendarUnit = NSCalendarUnit.Day
            let components = calendar.components(unitFlags, fromDate: now, toDate: self, options: [])
            return "After \(components.day) days"
    }
}

let jan2 = NSDate(timeIntervalSinceNow: 24*60*60*5)

jan2.relativeDaysFromToday()

Answer 3

试试这个

let startDateString = "03/01/2016" // start date
let endDateString = "15/01/2016" // end date

let dateFormatter = NSDateFormatter()
dateFormatter.dateFormat = "dd/MM/yyyy"

let startDate:NSDate = dateFormatter.dateFromString(startDateString)!
let endDate:NSDate = dateFormatter.dateFromString(endDateString)!

let gregorian = NSCalendar(calendarIdentifier:NSCalendarIdentifierGregorian)
let components = gregorian?.components(NSCalendarUnit.Day, fromDate: startDate, toDate: endDate, options: .MatchFirst)

let day = components?.day
if day == 0 {
  print( "Today")
} else {
  print( "After\(Int64(day!)) day(s)")
}

Answer 4

您可以使用以下代码 Swift 5:

func DateFormat() -> DateFormatter {
    let x = DateFormatter()
    x.dateFormat = "dd/MM/yyyy"
    x.timeZone = TimeZone(abbreviation: "GMT")
    return x
}

func secondsToDays (seconds : Int) -> (Int) {
    return (seconds / 86400)
}

var dates: Date?
var today: Date?

dates = DateFormat().date(from: "15/01/2016")
today = DateFormat().date(from: "17/01/2016")

let timeInterval = Int(exactly: (today?.timeIntervalSince(dates!))!) ?? 0
print("After", secondsToDays(seconds: timeInterval), "days" ) //After 2 days

Answer 5

我建议使用下一个方法计算。

func relativeDaysFromToday(startDate: Date, endDate: Date)->String
{
let diffComponents = Calendar.current.dateComponents([.day], from: startDate, to: endDate)
let days = diffComponents.day
return "After \(days ?? 0) days"
}

swift：如何计算日期间隔（今天~指定日期）

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