Swift 中的日期格式 [英] Date Format in Swift

问题描述

我将如何从日期转换此日期时间?

How will I convert this datetime from the date?

来自:2016-02-29 12:24:26
至:2016 年 2 月 29 日

From this: 2016-02-29 12:24:26
to: Feb 29, 2016

到目前为止，这是我的代码，它返回一个 nil 值:

So far, this is my code and it returns a nil value:

let dateFormatter = NSDateFormatter()
dateFormatter.dateFormat = "MM-dd-yyyy"
dateFormatter.timeZone = NSTimeZone(name: "UTC")
let date: NSDate? = dateFormatter.dateFromString("2016-02-29 12:24:26")
print(date)

推荐答案

您必须声明 2 个不同的 NSDateFormatters，第一个将字符串转换为 NSDate 和第二个以您的格式打印日期.
试试这个代码:

You have to declare 2 different NSDateFormatters, the first to convert the string to a NSDate and the second to print the date in your format.
Try this code:

let dateFormatterGet = NSDateFormatter()
dateFormatterGet.dateFormat = "yyyy-MM-dd HH:mm:ss"

let dateFormatterPrint = NSDateFormatter()
dateFormatterPrint.dateFormat = "MMM dd,yyyy"

let date: NSDate? = dateFormatterGet.dateFromString("2016-02-29 12:24:26")
print(dateFormatterPrint.stringFromDate(date!))

Swift 3 及更高版本:

从 Swift 3 NSDate 类已更改为 Date 和 NSDateFormatter 到 DateFormatter.

From Swift 3 NSDate class has been changed to Date and NSDateFormatter to DateFormatter.

let dateFormatterGet = DateFormatter()
dateFormatterGet.dateFormat = "yyyy-MM-dd HH:mm:ss"

let dateFormatterPrint = DateFormatter()
dateFormatterPrint.dateFormat = "MMM dd,yyyy"

if let date = dateFormatterGet.date(from: "2016-02-29 12:24:26") {
    print(dateFormatterPrint.string(from: date))
} else {
   print("There was an error decoding the string")
}

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