在Swift中转换字符串为日期

小开

试试下面的日期格式。

let dateFormatter = NSDateFormatter()
dateFormatter.dateFormat = "yyyy'-'MM'-'dd'T'HH':'mm':'ssZZZ"
let date = dateFormatter. dateFromString (strDate)

希望能有所帮助。

Swift 4.1:

let dateFormatter = DateFormatter()
dateFormatter.dateFormat = "yyyy'-'MM'-'dd'T'HH':'mm':'ssZZZ"
let date = dateFormatter.date(from: strDate)

小开

嗨，你有单独的T格式，然后转换为你喜欢

// create dateFormatter with UTC time format
let dateFormatter = NSDateFormatter()
dateFormatter.dateFormat = "yyyy-MM-dd'T'HH:mm:ss"
dateFormatter.timeZone = NSTimeZone(name: "UTC")
let date = dateFormatter.dateFromString("2015-04-01T11:42:00")


// change to a readable time format and change to local time zone
dateFormatter.dateFormat = "EEE, MMM d, yyyy - h:mm a"
dateFormatter.timeZone = NSTimeZone.localTimeZone()
let timeStamp = dateFormatter.stringFromDate(date!)

小开

最佳答案

将ISO8601字符串转换为日期

  let isoDate = "2016-04-14T10:44:00+0000"


let dateFormatter = DateFormatter()
dateFormatter.locale = Locale(identifier: "en_US_POSIX") // set locale to reliable US_POSIX
dateFormatter.dateFormat = "yyyy-MM-dd'T'HH:mm:ssZ"
let date = dateFormatter.date(from:isoDate)!

从日期中获取年、月、日和小时的日期组件

  let calendar = Calendar.current
let components = calendar.dateComponents([.year, .month, .day, .hour], from: date)

最后创建一个新的Date对象并剥离分钟和秒
```
  let finalDate = calendar.date(from:components)
```

还可以考虑iOS 10 / macOS 10.12中引入的方便格式化程序ISO8601DateFormatter:

let isoDate = "2016-04-14T10:44:00+0000"


let dateFormatter = ISO8601DateFormatter()
let date = dateFormatter.date(from:isoDate)!

小开

只要你传递你的dateformate和你的日期，你就会得到Year,month,day,hour。额外信息

func GetOnlyDateMonthYearFromFullDate(currentDateFormate:NSString , conVertFormate:NSString , convertDate:NSString ) -> NSString
{
let dateFormatter = NSDateFormatter()
dateFormatter.dateFormat = currentDateFormate as String
let formatter = NSDateFormatter()
formatter.dateFormat = Key_DATE_FORMATE as String
let finalDate = formatter.dateFromString(convertDate as String)
formatter.dateFormat = conVertFormate as String
let dateString = formatter.stringFromDate(finalDate!)


return dateString
}

获得年度< / >强

let Year = self.GetOnlyDateMonthYearFromFullDate("yyyy-MM-dd'T'HH:mm:ssZ", conVertFormate: "YYYY", convertDate: "2016-04-14T10:44:00+0000") as String
 得到月< / >强

let month = self.GetOnlyDateMonthYearFromFullDate("yyyy-MM-dd'T'HH:mm:ssZ", conVertFormate: "MM", convertDate: "2016-04-14T10:44:00+0000") as String
 得到一天< / >强

let day = self.GetOnlyDateMonthYearFromFullDate("yyyy-MM-dd'T'HH:mm:ssZ", conVertFormate: "dd", convertDate: "2016-04-14T10:44:00+0000") as String
 得到小时< / >强

let hour = self.GetOnlyDateMonthYearFromFullDate("yyyy-MM-dd'T'HH:mm:ssZ", conVertFormate: "hh", convertDate: "2016-04-14T10:44:00+0000") as String

小开

在Swift 4.1你可以做:

func getDate() -> Date? { let dateFormatter = DateFormatter() dateFormatter.dateFormat = "yyyy-MM-dd'T'HH:mm:ss" dateFormatter.timeZone = TimeZone.current dateFormatter.locale = Locale.current return dateFormatter.date(from: "2015-04-01T11:42:00") // replace Date String }

小开

Swift 3.0 - 4.2

import Foundation extension String { func toDate(withFormat format: String = "yyyy-MM-dd HH:mm:ss")-> Date?{ let dateFormatter = DateFormatter() dateFormatter.timeZone = TimeZone(identifier: "Asia/Tehran") dateFormatter.locale = Locale(identifier: "fa-IR") dateFormatter.calendar = Calendar(identifier: .gregorian) dateFormatter.dateFormat = format let date = dateFormatter.date(from: self) return date } } extension Date { func toString(withFormat format: String = "EEEE ، d MMMM yyyy") -> String { let dateFormatter = DateFormatter() dateFormatter.locale = Locale(identifier: "fa-IR") dateFormatter.timeZone = TimeZone(identifier: "Asia/Tehran") dateFormatter.calendar = Calendar(identifier: .persian) dateFormatter.dateFormat = format let str = dateFormatter.string(from: self) return str } }

小开

请使用ISO8601解析库来执行此操作。编码字符串的方法太多了。不要依赖于特定的格式，也不要依赖于始终发送相同的服务器。问题从末尾的“Z”开始，它将扩展到标准的所有品种。解析库将处理所有情况，并始终提供安全转换——而固定格式化字符串在将来可能会失败。

您可以使用这些库之一。CococaPods上也有:

https://github.com/boredzo/iso-8601-date-formatter/

https://github.com/malcommac/SwiftDate

看一下实现。它们都有几百行——这是有原因的。

关于这个问题:你可以使用NSDateComponents从日期中提取日期组件。网站上的例子正好符合你的情况。

https://developer.apple.com/documentation/foundation/nscalendar/1414841-components?language=objc

请注意，转换日期时会考虑到时区。你可能想显式地设置NSCalendar的locale。

小开

在swift4,

var Msg_Date_ = "2019-03-30T05:30:00+0000" let dateFormatterGet = DateFormatter() dateFormatterGet.dateFormat = "yyyy-MM-dd'T'HH:mm:ss" let dateFormatterPrint = DateFormatter() dateFormatterPrint.dateFormat = "MMM dd yyyy h:mm a" //"MMM d, h:mm a" for Sep 12, 2:11 PM let datee = dateFormatterGet.date(from: Msg_Date_) Msg_Date_ = dateFormatterPrint.string(from: datee ?? Date()) print(Msg_Date_)

//输出:- 2019年3月30日05:30 PM

小开

只是步骤1 > 从JSON或dataSource中获取String值

步骤2 >创建本地变量并赋值。

let startDate = CurrentDashBoard.startdate

步骤3>创建DateFormatter实例。

let dateFormatter = DateFormatter()
步骤4 > 从dateFormatter调用dateFormat并提供保存的日期dataType.

dateFormatter.dateFormat = "MM-dd-yyyy HH:mm:ss"("may be String formate")
 步骤5 >
.
.
let dateFromStringstartDate : NSDate = dateFormatter.date(from: startDate)! as NSDate
 步骤6 >

dateFormatter.dateFormat = "MM/dd/yyyy HH:mm:ss"

步骤6>分配给label/text

cell.lblStartDate.text = String(format: "%@", strstartDate)

代码:

let startDate = CurrentDashBoard.startdate let dateFormatter = DateFormatter() dateFormatter.dateFormat = "MM-dd-yyyy HH:mm:ss" let dateFromStringstartDate : NSDate = dateFormatter.date(from: startDate)! as NSDate dateFormatter.dateFormat = "MM/dd/yyyy HH:mm:ss" let strstartDate = dateFormatter.string(from: dateFromStringstartDate as Date)

小开

斯威夫特5。看是否一个日期已经通过:

let expiryDate = "2020-01-10" // Jan 10 2020 let dateFormatter = DateFormatter() dateFormatter.dateFormat = "yyyy-MM-dd" if Date() < dateFormatter.date(from: expiryDate) ?? Date() { print("Not Yet expiryDate") } else { print("expiryDate has passed") }

小开

创建全局函数

func convertDateFormat(inputDate: String) -> String { let olDateFormatter = DateFormatter() olDateFormatter.dateFormat = "yyyy-MM-dd'T'HH:mm:ss" let oldDate = olDateFormatter.date(from: inputDate) let convertDateFormatter = DateFormatter() convertDateFormatter.dateFormat = "MMM dd yyyy h:mm a" return convertDateFormatter.string(from: oldDate!) }

调用函数并在其中传递值

get_OutputStr = convertDateFormat(inputDate: "2019-03-30T05:30:00+0000")

这里是输出

Feb 25 2020 4:51 PM

小开

我对这种格式也很着迷。

请参阅下面的解决方案。

你的字符串来自你的背部或其他来源:

let isoDate = "2020-05-06 20:00:00-03"

识别日期格式

let dateFormatter = DateFormatter() dateFormatter.locale = Locale(identifier: "en_US_POSIX") dateFormatter.dateFormat = "yyyy-MM-dd' 'HH:mm:ssZ" let date = dateFormatter.date(from:isoDate)!

现在您已经将日期设置为date()，您可以使用formatDate.string将其更改为您想要的任何格式

let formatDate = DateFormatter() formatDate.dateFormat = "dd/MM/yyyy HH:mm" let drawDate = formatDate.string(from: date) print(drawDate)

输出:

06/05/2020 20:00

小开

就用SwifterSwift吧。

stringDate = "2020-04-26T08:56:17.987Z" let date = Date(iso8601String: stringDate)

小开

有时，在swift中将字符串转换为Date可能会返回nil，因此您应该添加"!"标记到格式。日期函数!

let dateFormatterUK = DateFormatter() dateFormatterUK.dateFormat = "dd-MM-yyyy" let stringDate = "11-03-2018" let date = dateFormatterUK.date(from: stringDate)!

小开

从iOS 15.0开始，我们可以更快速地将字符串转换为日期:

let strategy = Date.ParseStrategy(format: "\(year: .defaultDigits)-\(month: .twoDigits)-\(day: .twoDigits)T\(hour: .twoDigits(clock: .twentyFourHour, hourCycle: .zeroBased)):\(minute: .twoDigits):\(second: .twoDigits)\(timeZone: .iso8601(.short))", timeZone: .current) let date = try? Date("2016-04-14T10:44:00+0000", strategy: strategy)

小开

在swift中使用字符串扩展名将字符串转换为日期 Swift - 5.0

extension String { public enum DateFormatType { /// The ISO8601 formatted year "yyyy" i.e. 1997 case isoYear /// The ISO8601 formatted year and month "yyyy-MM" i.e. 1997-07 case isoYearMonth /// The ISO8601 formatted date "yyyy-MM-dd" i.e. 1997-07-16 case isoDate /// The ISO8601 formatted date and time "yyyy-MM-dd'T'HH:mmZ" i.e. 1997-07-16T19:20+01:00 case isoDateTime /// The ISO8601 formatted date, time and sec "yyyy-MM-dd'T'HH:mm:ssZ" i.e. 1997-07-16T19:20:30+01:00 case isoDateTimeSec /// The ISO8601 formatted date, time and millisec "yyyy-MM-dd'T'HH:mm:ss.SSSZ" i.e. 1997-07-16T19:20:30.45+01:00 case isoDateTimeMilliSec /// The dotNet formatted date "/Date(%d%d)/" i.e. "/Date(1268123281843)/" case dotNet /// The RSS formatted date "EEE, d MMM yyyy HH:mm:ss ZZZ" i.e. "Fri, 09 Sep 2011 15:26:08 +0200" case rss /// The Alternative RSS formatted date "d MMM yyyy HH:mm:ss ZZZ" i.e. "09 Sep 2011 15:26:08 +0200" case altRSS /// The http header formatted date "EEE, dd MM yyyy HH:mm:ss ZZZ" i.e. "Tue, 15 Nov 1994 12:45:26 GMT" case httpHeader /// A generic standard format date i.e. "EEE MMM dd HH:mm:ss Z yyyy" case standard /// A custom date format string case custom(String) /// The local formatted date and time "yyyy-MM-dd HH:mm:ss" i.e. 1997-07-16 19:20:00 case localDateTimeSec /// The local formatted date "yyyy-MM-dd" i.e. 1997-07-16 case localDate /// The local formatted time "hh:mm a" i.e. 07:20 am case localTimeWithNoon /// The local formatted date and time "yyyyMMddHHmmss" i.e. 19970716192000 case localPhotoSave case birthDateFormatOne case birthDateFormatTwo /// case messageRTetriveFormat /// case emailTimePreview var stringFormat:String { switch self { //handle iso Time case .birthDateFormatOne: return "dd/MM/YYYY" case .birthDateFormatTwo: return "dd-MM-YYYY" case .isoYear: return "yyyy" case .isoYearMonth: return "yyyy-MM" case .isoDate: return "yyyy-MM-dd" case .isoDateTime: return "yyyy-MM-dd'T'HH:mmZ" case .isoDateTimeSec: return "yyyy-MM-dd'T'HH:mm:ssZ" case .isoDateTimeMilliSec: return "yyyy-MM-dd'T'HH:mm:ss.SSSZ" case .dotNet: return "/Date(%d%f)/" case .rss: return "EEE, d MMM yyyy HH:mm:ss ZZZ" case .altRSS: return "d MMM yyyy HH:mm:ss ZZZ" case .httpHeader: return "EEE, dd MM yyyy HH:mm:ss ZZZ" case .standard: return "EEE MMM dd HH:mm:ss Z yyyy" case .custom(let customFormat): return customFormat //handle local Time case .localDateTimeSec: return "yyyy-MM-dd HH:mm:ss" case .localTimeWithNoon: return "hh:mm a" case .localDate: return "yyyy-MM-dd" case .localPhotoSave: return "yyyyMMddHHmmss" case .messageRTetriveFormat: return "yyyy-MM-dd'T'HH:mm:ssZZZZZ" case .emailTimePreview: return "dd MMM yyyy, h:mm a" } } } func toDate(_ format: DateFormatType = .isoDate) -> Date?{ let dateFormatter = DateFormatter() dateFormatter.dateFormat = format.stringFormat let date = dateFormatter.date(from: self) return date } }

我们用like

string.toDate(.isoDate) "1997-05-24".toDate(.isoDate)

小开

那SwiftDate呢?Swift最好的日期和时间解析和操作库。

https://github.com/malcommac/SwiftDate#1-date-parsing

使用可可豆荚安装: https://github.com/malcommac/SwiftDate/blob/master/Documentation/0.Informations.md#installation 
然后:

import SwiftDate // All default datetime formats (15+) are recognized automatically let _ = "2010-05-20 15:30:00".toDate() // You can also provide your own format! let _ = "2010-05-20 15:30".toDate("yyyy-MM-dd HH:mm") // All ISO8601 variants are supported too with timezone parsing! let _ = "2017-09-17T11:59:29+02:00".toISODate() // RSS, Extended, HTTP, SQL, .NET and all the major variants are supported! let _ = "19 Nov 2015 22:20:40 +0100".toRSS(alt: true)

小开

斯威夫特5.6

这是一个简单的方法来获得一个字符串，并将其转换回字符串与日期的结构通过字符串扩展

日期字符串示例"2022-03-15T07:13:49.607+00:00"

如果日期不是格式"yyyy-MM-dd'T'HH:mm:ss. sssssz" 返回01-01-70

import Foundation extension String { func convertToDate() -> String { let dateFormatter = DateFormatter() dateFormatter.dateFormat = "yyyy-MM-dd'T'HH:mm:ss.SSSSSSSZ" if let dt = dateFormatter.date(from: self) { dateFormatter.dateFormat = "MM-dd-yy" let formatedStringDate = dateFormatter.string(from: dt) return formatedStringDate } return "01-01-70" } }