iOS DateFormatter error with year 2099

Question

I have created an extension to manage my dates parsing but I have an issue with date of 2099/12/31!

Here's my extension which gives me date object from YYYYMMdd string and reverse fonction.

extension Date {



// build date from string with YYYYMMDD format

static func dateCSDFrom(_ stringDate : String) -> Date?{

    let dateFormatter = CSDDateFormatter()

    return dateFormatter.date(from: stringDate)

}

// reverse function

func stringCSDFromDate() -> String{

    return Date.CSDDateFormatter().string(from: self)

}



private static func CSDDateFormatter() -> DateFormatter{

    let dateFormatter = DateFormatter()

    dateFormatter.dateFormat = "YYYYMMdd"

    return dateFormatter

}}

Here's my test :

let dateString = "20991231"

let date = Date.dateCSDFrom(dateString)

print("date object: \(date)")

print("date string: \(date?.stringCSDFromDate())")

And here's my output :

date object: Optional(2099-12-30 23:00:00 +0000)
date string: Optional("21001231")

As you can see I have a error of a year :(
I have the same result with year 2098, but all is correct with year 2100.

Any idea ?

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Answer 1

Use yyyy instead of YYYY Take a look at this : http://www.unicode.org/reports/tr35/tr35-31/tr35-dates.html#Date_Format_Patterns

iOS DateFormatter error with year 2099

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