ios Swift 中的日期格式
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Date Format in Swift
提问by Sydney Loteria
How will I convert this datetime from the date?
我将如何从日期转换这个日期时间？
From this: 2016-02-29 12:24:26
to: Feb 29, 2016
从此：2016-02-29 12:24:26
至：2016 年 2 月 29 日
So far, this is my code and it returns a nil value:
到目前为止，这是我的代码，它返回一个 nil 值：
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)
回答by LorenzOliveto
You have to declare 2 different NSDateFormatters, the first to convert the string to a NSDateand the second to print the date in your format.
Try this code:
您必须声明 2 个不同的NSDateFormatters，第一个将字符串转换为 a NSDate，第二个以您的格式打印日期。
试试这个代码：
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 and higher:
Swift 3 及更高版本：
From Swift 3 NSDateclass has been changed to Dateand NSDateFormatterto DateFormatter.
从斯威夫特3NSDate类已更改为Date与NSDateFormatter对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")
}
回答by BatyrCan
This may be useful for who want to use dateformater.dateformat;
if you want 12.09.18you use dateformater.dateformat = "dd.MM.yy"
这对于想要使用 dateformater.dateformat 的人可能很有用；如果你想12.09.18你使用dateformater.dateformat = "dd.MM.yy"
Wednesday, Sep 12, 2018 --> EEEE, MMM d, yyyy
09/12/2018 --> MM/dd/yyyy
09-12-2018 14:11 --> MM-dd-yyyy HH:mm
Sep 12, 2:11 PM --> MMM d, h:mm a
September 2018 --> MMMM yyyy
Sep 12, 2018 --> MMM d, yyyy
Wed, 12 Sep 2018 14:11:54 +0000 --> E, d MMM yyyy HH:mm:ss Z
2018-09-12T14:11:54+0000 --> yyyy-MM-dd'T'HH:mm:ssZ
12.09.18 --> dd.MM.yy
10:41:02.112 --> HH:mm:ss.SSS
回答by Jonas Deichelmann
Swift 3 and higher
Swift 3 及更高版本
let dateFormatter = DateFormatter()
dateFormatter.dateStyle = .medium
dateFormatter.timeStyle = .none
dateFormatter.locale = Locale(identifier: "en_US")
print(dateFormatter.string(from: date)) // Jan 2, 2001
This is also helpful when you want to localize your App. The Locale(identifier: ) uses the ISO 639-1 Code. See also the Apple Documentation
当您想要本地化您的应用程序时，这也很有帮助。Locale(identifier :)使用ISO 639-1 代码。另请参阅Apple 文档
回答by Vishal Vaghasiya
Swift - 5.0
斯威夫特 - 5.0
let date = Date()
let formate = date.getFormattedDate(format: "yyyy-MM-dd HH:mm:ss") // Set output formate
extension Date {
func getFormattedDate(format: String) -> String {
let dateformat = DateFormatter()
dateformat.dateFormat = format
return dateformat.string(from: self)
}
}
Swift - 4.0
斯威夫特 - 4.0
2018-02-01T19:10:04+00:00Convert Feb 01,2018
2018-02-01T19:10:04+00:00转换2018 年 2 月 1 日
extension Date {
static func getFormattedDate(string: String , formatter:String) -> String{
let dateFormatterGet = DateFormatter()
dateFormatterGet.dateFormat = "yyyy-MM-dd'T'HH:mm:ssZ"
let dateFormatterPrint = DateFormatter()
dateFormatterPrint.dateFormat = "MMM dd,yyyy"
let date: Date? = dateFormatterGet.date(from: "2018-02-01T19:10:04+00:00")
print("Date",dateFormatterPrint.string(from: date!)) // Feb 01,2018
return dateFormatterPrint.string(from: date!);
}
}
回答by ciccioska
Swift 3version with the new Dateobject instead NSDate:
Swift 3版本改为使用新Date对象NSDate：
let dateFormatterGet = DateFormatter()
dateFormatterGet.dateFormat = "yyyy-MM-dd HH:mm:ss"
let dateFormatter = DateFormatter()
dateFormatter.dateFormat = "MMM dd,yyyy"
let date: Date? = dateFormatterGet.date(from: "2017-02-14 17:24:26")
print(dateFormatter.string(from: date!))
EDIT: after mitul-nakumsuggestion
编辑：在mitul-nakum建议之后
回答by iParesh
swift 3
迅捷 3
let date : Date = Date()
let dateFormatter = DateFormatter()
dateFormatter.dateFormat = "MMM dd, yyyy"
let todaysDate = dateFormatter.string(from: date)
回答by ?ngelo Polotto
I solved my problem to the format yyyy-MM-dd'T'HH:mm:ss.SSS'Z'(e.g 2018-06-15T00:00:00.000Z) with this:
我通过以下格式解决了我的问题yyyy-MM-dd'T'HH:mm:ss.SSS'Z'（例如 2018-06-15T00:00:00.000Z）：
func formatDate(date: String) -> String {
let dateFormatterGet = DateFormatter()
dateFormatterGet.dateFormat = "yyyy-MM-dd'T'HH:mm:ss.SSS'Z'"
let dateFormatter = DateFormatter()
dateFormatter.dateStyle = .medium
dateFormatter.timeStyle = .none
// dateFormatter.locale = Locale(identifier: "en_US") //uncomment if you don't want to get the system default format.
let dateObj: Date? = dateFormatterGet.date(from: date)
return dateFormatter.string(from: dateObj!)
}
回答by Akbar Khan
Swift 4, 4.2 and 5
斯威夫特 4、4.2 和 5
func getFormattedDate(date: Date, format: String) -> String {
let dateformat = DateFormatter()
dateformat.dateFormat = format
return dateformat.string(from: date)
}
let formatingDate = getFormattedDate(date: Date(), format: "dd-MMM-yyyy")
print(formatingDate)
回答by Jonathan Cravotta
Swift 3 with a Dateextension
带有Date扩展的Swift 3
extension Date {
func string(with format: String) -> String {
let dateFormatter = DateFormatter()
dateFormatter.dateFormat = format
return dateFormatter.string(from: self)
}
}
Then you can use it like so:
然后你可以像这样使用它：
let date = Date()
date.string(with: "MMM dd, yyyy")
回答by Markus
Another interessant possibility of format date. This screenshot belongs to Apple's App "News".
格式化日期的另一个有趣的可能性。这张截图属于苹果的App“新闻”。
Here is the code:
这是代码：
let dateFormat1 = DateFormatter()
dateFormat1.dateFormat = "EEEE"
let stringDay = dateFormat1.string(from: Date())
let dateFormat2 = DateFormatter()
dateFormat2.dateFormat = "MMMM"
let stringMonth = dateFormat2.string(from: Date())
let dateFormat3 = DateFormatter()
dateFormat3.dateFormat = "dd"
let numDay = dateFormat3.string(from: Date())
let stringDate = String(format: "%@\n%@ %@", stringDay.uppercased(), stringMonth.uppercased(), numDay)
Nothing to add to alternative proposed by lorenzoliveto. It's just perfect.
没有什么可以添加到 lorenzoliveto 提出的替代方案。这太完美了。
let dateFormat = DateFormatter()
dateFormat.dateFormat = "EEEE\nMMMM dd"
let stringDate = dateFormat.string(from: Date()).uppercased()
