Formatting String to Date object returns nil when there are no milliseconds

Question

I am parsing some dates sent via JSON and until today its been working perfectly. I am using the code from this answer:

extension Formatter {
    static let iso8601: DateFormatter = {
        let formatter = DateFormatter()
        formatter.calendar = Calendar(identifier: .iso8601)
        formatter.locale = Locale(identifier: "en_US_POSIX")
        formatter.timeZone = TimeZone(secondsFromGMT: 0)
        formatter.dateFormat = "yyyy-MM-dd'T'HH:mm:ss.SSSZ"
        return formatter
    }()
}


extension String {
    var dateFromISO8601: Date? {
        let date = Formatter.iso8601.date(from: self)
        return date
    }
}

...
let date = crossingTime.dateFromISO8601!
...

Looking at the dates that are being sent and assigned to crossingTime the one that is causing date to be nil is "2018-08-27T16:00:09Z". However another that works perfectly fine is "2018-08-23T13:59:54.447Z"

Which looking at the dates its clear one date has the milliseconds and the one thats failed doesn't. Is it possible to support both date formats?

FYI - there is no need to set the formatter's timezone since the string you are parsing provides its own timezone. — rmaddy, Aug 30 '18 at 20:21
@rmaddy This won't make a difference while parsing but it is required when creating a string from date. — Leo Dabus, Aug 30 '18 at 20:25
@LeoDabus Of course but then, in most cases, you want the locale timezone. But that's up to the needs of the app. — rmaddy, Aug 30 '18 at 21:56

Formatting String to Date object returns nil when there are no milliseconds

0 Answers0