我正在分析这个
2017-01-23T10:12:31.484Z
使用iOS 10提供的原生ISO8601DateFormatter类，但总是失败.
我try 过这个和许多options个组合，但总是失败...
let formatter = ISO8601DateFormatter()
formatter.timeZone = TimeZone(secondsFromGMT: 0)
formatter.formatOptions = [.withInternetDateTime, .withDashSeparatorInDate, .withColonSeparatorInTime, .withColonSeparatorInTimeZone, .withFullTime]
知道吗？
macOS 10.13/iOS 11之前的版本ISO8601DateFormatter不支持包括毫秒在内的日期字符串.
解决方法是使用正则表达式删除毫秒部分.
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分数秒:
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)