Swift：无法正确获取NSDate dateFormatter [英] Swift: can't get NSDate dateFormatter right

问题描述

DateFormatter对我来说很有趣：

DateFormatter is acting funny to me:

let dateFormatter = NSDateFormatter()
dateFormatter.dateFormat = "MM'/'DD'/'YYYY"
var dateString = "09/28/1989"
var date = dateFormatter.dateFromString(dateString)
println(date)

返回：

可选（ 1988-12-24 13:00:00 +0000）

"Optional(1988-12-24 13:00:00 +0000)"

任何帮助将不胜感激。

推荐答案

看来您的日期格式化程序有点麻烦了。 MM'/'DD'/'YYYY 读取已填充月份/一年中的某天（而非月份）/当前周的某年（因此1月1-6日可能会重叠并增加副作用）

It looks like your date formatter is a bit off. "MM'/'DD'/'YYYY" reads "Padded month / day of the year (not month) / year of the current week (so Jan 1-6 could overlap and add side-effects)"

我猜您的目标是 MM'/'dd'/'yyyy ，显示为每月的填充月份/每月的填充日期

I'm guessing that what you're aiming for is "MM'/'dd'/'yyyy", which reads "Padded month / padded day of month / year"

作为参考，这是当前使用的 Unicode技术标准，Apple将其记录为iOS 7+和OSX 10.9+的标准此处

For reference, here's the currently-used Unicode Technical Standard that Apple documents as their standard for iOS 7+ and OSX 10.9+ here

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