ISO8601DateFormatter doesn't parse ISO date string

ios swift date swift3 ios10
mhergon picture mhergon · Jan 25, 2017 · Viewed 13.6k times · Source

I'm trying to parse this

2017-01-23T10:12:31.484Z

using native ISO8601DateFormatter class provided by iOS 10 but always fails. If the string not contains milliseconds, the Date object is created without problems.

I'm tried this and many options combination but always fails...

let formatter = ISO8601DateFormatter()
formatter.timeZone = TimeZone(secondsFromGMT: 0)
formatter.formatOptions = [.withInternetDateTime, .withDashSeparatorInDate, .withColonSeparatorInTime, .withColonSeparatorInTimeZone, .withFullTime]

Any idea? Thanks!

Answer

vadian picture vadian · Jan 25, 2017

Prior to macOS 10.13 / iOS 11 ISO8601DateFormatter does not support date strings including milliseconds.

A workaround is to remove the millisecond part with regular expression.

let isoDateString = "2017-01-23T10:12:31.484Z"
let trimmedIsoString = isoDateString.replacingOccurrences(of: "\\.\\d+", with: "", options: .regularExpression)
let formatter = ISO8601DateFormatter()
let date = formatter.date(from: trimmedIsoString)

In macOS 10.13+ / iOS 11+ a new option is added to support fractional seconds:

static var withFractionalSeconds: ISO8601DateFormatter.Options { get }

let isoDateString = "2017-01-23T10:12:31.484Z"
let formatter = ISO8601DateFormatter()
formatter.formatOptions =  [.withInternetDateTime, .withFractionalSeconds]
let date = formatter.date(from: isoDateString)

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