ISO8601DateFormatter 不解析 ISO 日期字符串 [英] ISO8601DateFormatter doesn't parse ISO date string

问题描述

我正在尝试解析这个

2017-01-23T10:12:31.484Z

2017-01-23T10:12:31.484Z

使用 iOS 10 提供的原生 ISO8601DateFormatter 类，但总是失败.如果字符串不包含毫秒，则创建 Date 对象没有问题.

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

我尝试过这个和许多 options 组合但总是失败......

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]

有什么想法吗?谢谢！

推荐答案

macOS 10.13/iOS 11 之前的ISO8601DateFormatter 不支持包含毫秒的日期字符串.

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

解决方法是使用正则表达式删除毫秒部分.

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)

在 macOS 10.13+/iOS 11+ 中添加了一个新选项以支持小数秒:

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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