如何将stringdate转换为NSDate？

我想在Swift中把“2014-07-15 06:55:14.198000 + 00：00”这个string的date转换成NSDate。

Answer 1

尝试这个：

let dateFormatter = NSDateFormatter() dateFormatter.dateFormat = /* find out and place date format from * http://userguide.icu-project.org/formatparse/datetime */ let date = dateFormatter.dateFromString(/* your_date_string */) 

进一步的查询请参阅文档 。

Swift 3和更高版本

 let dateFormatter = DateFormatter() dateFormatter.dateFormat = /* date_format_you_want_in_string from * http://userguide.icu-project.org/formatparse/datetime */ let date = dateFormatter.date(from: /* your_date_string */) 

Answer 2

 import Foundation var dateString = "2014-07-15" // change to your date format var dateFormatter = NSDateFormatter() dateFormatter.dateFormat = "yyyy-MM-dd" var date = dateFormatter.dateFromString(dateString) println(date) 

我可以用这个代码来做。

Answer 3

  func convertDateFormatter(date: String) -> String { let dateFormatter = NSDateFormatter() dateFormatter.dateFormat = "yyyy-MM-dd'T'HH:mm:ss.SSSZ"//this your string date format dateFormatter.timeZone = NSTimeZone(name: "UTC") let date = dateFormatter.dateFromString(date) dateFormatter.dateFormat = "yyyy MMM EEEE HH:mm"///this is what you want to convert format dateFormatter.timeZone = NSTimeZone(name: "UTC") let timeStamp = dateFormatter.stringFromDate(date!) return timeStamp } 

更新了Swift 3。

 func convertDateFormatter(date: String) -> String { let dateFormatter = DateFormatter() dateFormatter.dateFormat = "yyyy-MM-dd'T'HH:mm:ss.SSSZ"//this your string date format dateFormatter.timeZone = NSTimeZone(name: "UTC") as TimeZone! let date = dateFormatter.date(from: date) dateFormatter.dateFormat = "yyyy MMM EEEE HH:mm"///this is what you want to convert format dateFormatter.timeZone = NSTimeZone(name: "UTC") as TimeZone! let timeStamp = dateFormatter.string(from: date!) return timeStamp } 

Answer 4

如果您需要经常将stringparsing为date，则可能需要将该function移到扩展中。 我创build了一个sharedCode.swift文件，并在其中放置我的扩展：

 extension String { func toDateTime() -> NSDate { //Create Date Formatter let dateFormatter = NSDateFormatter() //Specify Format of String to Parse dateFormatter.dateFormat = "yyyy-MM-dd hh:mm:ss.SSSSxxx" //Parse into NSDate let dateFromString : NSDate = dateFormatter.dateFromString(self)! //Return Parsed Date return dateFromString } } 

那么如果你想把你的string转换成一个NSDate，你可以只写如下的东西：

 var myDate = myDateString.toDateTime() 

Answer 5

细节

Swift 3，xCode 8.2.1

date格式的扩展

 import Foundation extension DateFormatter { convenience init (format: String) { self.init() dateFormat = format locale = Locale.current } } extension String { func toDate (format: String) -> Date? { return DateFormatter(format: format).date(from: self) } func toDateString (inputFormat: String, outputFormat:String) -> String? { if let date = toDate(format: inputFormat) { return DateFormatter(format: outputFormat).string(from: date) } return nil } } extension Date { func toString (format:String) -> String? { return DateFormatter(format: format).string(from: self) } } 

用法

 var dateString = "14.01.2017T14:54:00" let format = "dd.MM.yyyy'T'HH:mm:ss" let date = Date() print("original String with date: \(dateString)") print("date String() to Date(): \(dateString.toDate(format: format)!)") print("date String() to formated date String(): \(dateString.toDateString(inputFormat: format, outputFormat: "dd MMMM")!)") print("format Date(): \(date.toString(format: "dd MMM HH:mm")!)") 

结果

更多信息

关于date格式

Answer 6

对于Swift 3

 func stringToDate(_ str: String)->Date{ let formatter = DateFormatter() formatter.dateFormat="yyyy-MM-dd hh:mm:ss Z" return formatter.date(from: str)! } func dateToString(_ str: Date)->String{ var dateFormatter = DateFormatter() dateFormatter.timeStyle=DateFormatter.Style.short return dateFormatter.string(from: str) } 

Answer 7

Swift支持扩展，通过扩展可以为现有的class ， structure ， enumeration或protocoltypes添加新的function。

您可以通过使用extension关键字extension对象来将新的init函数添加到NSDate对象。

 extension NSDate { convenience init(dateString:String) { let dateStringFormatter = NSDateFormatter() dateStringFormatter.dateFormat = "yyyyMMdd" dateStringFormatter.locale = NSLocale(localeIdentifier: "fr_CH_POSIX") let d = dateStringFormatter.dateFromString(dateString)! self.init(timeInterval:0, sinceDate:d) } } 

现在你可以使用以下命令来初始化NSDate对象：

 let myDateObject = NSDate(dateString:"2010-12-15 06:00:00") 

Answer 8

自Swift 3以来，许多NS前缀已经被删除。

 let dateFormatter = DateFormatter() dateFormatter.dateFormat = "yyyy-MM-dd'T'HH:mm:ss.SSSZ" /* date format string rules * http://userguide.icu-project.org/formatparse/datetime */ let date = dateFormatter.date(from: dateString) 

Answer 9

这个QA页面上的代码片段是“颠倒的”…

苹果提到的第一件事是你caching你的格式化程序…

链接到苹果doco，说明如何做到这一点：

高速caching格式化程序创builddate格式化程序不是一个便宜的操作。 caching单个实例…

使用全球…

 let df : DateFormatter = { let formatter = DateFormatter() formatter.dateFormat = "yyyy-MM-dd" return formatter }() 

那么只需在任何地方使用格式化程序

 let s = df.string(from: someDate) 

要么

 let d = df.date(from: someString) 

或者使用DateFormatter上其他许多方便的方法。

这很简单。

（如果你在String上编写扩展，你的代码是完全颠倒的 – 你不能使用任何的dateFormatter调用！）

请注意，通常你会有一些全局的..如“formatForClient”“formatForPubNub”“formatForDisplayOnInvoiceScreen”..等

Answer 10

要在Swift中的date格式中添加string，我做了这个

  var dataFormatter:NSDateFormatter = NSDateFormatter() dataFormatter.dateFormat = "dd-MMMM 'at' HH:mm a" cell.timeStamplbl.text = dataFormatter.stringFromDate(object.createdAt) 

Answer 11

对于SWIFT 3.1

 func convertDateStringToDate(longDate: String) -> String{ /* INPUT: longDate = "2017-01-27T05:00:00.000Z" * OUTPUT: "1/26/17" * date_format_you_want_in_string from * http://userguide.icu-project.org/formatparse/datetime */ let dateFormatter = DateFormatter() dateFormatter.dateFormat = "yyyy-MM-dd'T'HH:mm:ss.SSSZ" let date = dateFormatter.date(from: longDate) if date != nil { let formatter = DateFormatter() formatter.dateStyle = .short let dateShort = formatter.string(from: date!) return dateShort } else { return longDate } } 

注意：这将返回原来的string，如果错误

Answer 12

Swift 3,4：

2个有用的转换：

 string(from: Date) // to convert from Date to a String date(from: String) // to convert from String to Date 

用法：1。

 let date = Date() //gives today's date let dateFormatter = DateFormatter() dateFormatter.dateFormat = "dd.MM.yyyy" let todaysDateInUKFormat = dateFormatter.string(from: date) 

2。

  let someDateInString = "23.06.2017" var getDateFromString = dateFormatter.date(from: someDateInString) 

Answer 13

这个工作对我来说..

  import Foundation import UIKit //dateString = "01/07/2017" private func parseDate(_ dateStr: String) -> String { let simpleDateFormat = DateFormatter() simpleDateFormat.dateFormat = "dd/MM/yyyy" //format our date String let dateFormat = DateFormatter() dateFormat.dateFormat = "dd 'de' MMMM 'de' yyyy" //format return let date = simpleDateFormat.date(from: dateStr) return dateFormat.string(from: date!) } 

Answer 14

 Swift: iOS if we have string, convert it to NSDate, var dataString = profileValue["dob"] as String var dateFormatter = NSDateFormatter() dateFormatter.dateFormat = "MM-dd-yyyy" // convert string into date let dateValue:NSDate? = dateFormatter.dateFromString(dataString) if you have and date picker parse date like this // to avoid any nil value if let isDate = dateValue { self.datePicker.date = isDate } 

Answer 15

 import Foundation let now : String = "2014-07-16 03:03:34 PDT" var date : NSDate var dateFormatter : NSDateFormatter date = dateFormatter.dateFromString(now) date // $R6: __NSDate = 2014-07-16 03:03:34 PDT 

https://developer.apple.com/library/prerelease/mac/documentation/Cocoa/Reference/Foundation/Classes/NSDateFormatter_Class/index.html#//apple_ref/doc/uid/20000447-SW32