如何获得当前时间为datetime

从操场开始。我正在尝试创建一个简单的应用程序。

我创建了一个date对象，就像这样:

var date = NSDate()

我怎样才能得到当前的时间?在其他语言中，我可以这样做:

var hour = date.hour

但我找不到任何这样的属性/方法。我找到了一个方法，dateWithCalendarFormat。我应该用这个吗?如果是，怎么做?

当前回答

你可以从Dateformatter获取

let dateFormatter = DateFormatter()
dateFormatter.dateFormat = "dd/MM/yyyy"
let dateString = dateFormatter.string(from:Date())
print(dateString)

2017-04-29 11:18:21

其他回答

你可以用swift 4或5像bellow

let date = Date()
let df = DateFormatter()
df.dateFormat = "yyyy-MM-dd HH:mm:ss"
let dateString = df.string(from: date)

输出将像波纹管

2019-12-20 09:40:08

2019-12-20 03:58:42

使用Date Formatter -Swift 3.0

//Date
let dateFormatter = DateFormatter()
dateFormatter.dateStyle = .medium
let dateString = "Current date is: \(dateFormatter.string(from: Date() as Date))"
labelfordate.text = String(dateString)


//Time    
let timeFormatter = DateFormatter()
timeFormatter.timeStyle = .medium
let timeString = "Current time is: \(timeFormatter.string(from: Date() as Date))"
labelfortime.text = String(timeString)

每秒钟更新一次日期和时间

override func viewDidLoad() {
super.viewDidLoad()

timer = Timer.scheduledTimer(timeInterval: 1, target: self, selector: #selector(DateAndTime.action), userInfo: nil, repeats: true)

       }

func action()
    {
    //Date
    let dateFormatter = DateFormatter()
    dateFormatter.dateStyle = .medium
    let dateString = "Current date is: \(dateFormatter.string(from: Date() as Date))"
    labelfordate.text = String(dateString)


    //Time
    let timeFormatter = DateFormatter()
    timeFormatter.timeStyle = .medium
    let timeString = "Current time is: \(timeFormatter.string(from: Date() as Date))"
    labelfortime.text = String(timeString)

    }

注意:定时器代码中的DateAndTime是类名。

2017-01-10 11:04:46

使用Swift 5 (Xcode 10 & Xcode 11)(来自法国UTC)

func getCurrentDateTime() {
    let now = Date()
    let formatter = DateFormatter()
    formatter.locale = Locale(identifier: "fr_FR")
    formatter.dateFormat = "EEEE dd MMMM YYYY HH:mm"
    myLabel.text = formatter.string(from: now)
    myLabel.font = UIFont(name: "HelveticaNeue-Light", size: 12)
    myLabel.textColor = UIColor.black
}

如果您只想显示日期，请设置formatter.dateFormat

formatter.dateFormat = "EEEE dd MMMM YYYY"

若要只显示小时，请更改格式化程序。dateFormat来

formatter.dateFormat = "HH:mm"

不要忘记在viewDidLoad上添加getCurrentDateTime()。

2019-06-27 19:08:53

斯威夫特5

func printTimestamp() {
    let timestamp = DateFormatter.localizedString(from: NSDate() as Date, dateStyle: .medium, timeStyle: .short)
    print(timestamp)
}

和调用函数printTimestamp()

2019-11-12 11:11:40

斯威夫特4

let dateFormatter : DateFormatter = DateFormatter()
//  dateFormatter.dateFormat = "yyyy-MM-dd HH:mm:ss"
dateFormatter.dateFormat = "yyyy-MMM-dd HH:mm:ss"
let date = Date()
let dateString = dateFormatter.string(from: date)
let interval = date.timeIntervalSince1970

输出

2018 - 5月- 01 10:41:31

2018-05-01 05:14:22

如何获得当前时间为datetime

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