在Swift 3中，

    let date = Date()
    let calendar = Calendar.current()

    let hour = calendar.component(.hour, from: date)

仅用于特定格式的日期

    let dateFormatter1 = NSDateFormatter()
    dateFormatter1.dateStyle = .MediumStyle
    dateFormatter1.timeStyle = .NoStyle
    dateFormatter1.dateFormat = "dd-MM-yyyy"
    let date = dateFormatter1.stringFromDate(NSDate())

在Swift 5中，Foundation提供了许多从Date对象中获取小时值的方法。根据您的需要，您可以选择以下四个Playground代码片段之一。

---

# 1。使用Calendar dateComponents(_:from:)方法

Calendar有一个叫做dateComponents(_:from:)的方法。dateComponents(_:from:)有如下声明:

func dateComponents(_ components: Set<Calendar.Component>, from date: Date) -> DateComponents

使用日历时区返回日期的所有日期组件。

用法:

import Foundation

let date = Date()
let dateComponents = Calendar.current.dateComponents([.hour], from: date)
let hour = dateComponents.hour
print(String(describing: hour)) // may print: Optional(13)

---

# 2。使用Calendar组件(_:from:)方法

Calendar有一个叫做component(_:from:)的方法。组件(_:from:)有以下声明:

返回日期的一个组件的值。

func component(_ component: Calendar.Component, from date: Date) -> Int

用法:

import Foundation

let date = Date()
let hour = Calendar.current.component(.hour, from: date)
print(hour) // may print: 13

---

# 3。使用DateFormatter dateFormat属性

DateFormatter有一个名为dateFormat的属性。dateFormat有如下声明:

var dateFormat: String! { get set }

接收方使用的日期格式字符串。

用法:

import Foundation

let date = Date()
let dateFormatter = DateFormatter()
dateFormatter.dateFormat = "HH"
let hour = dateFormatter.string(from: date)
print(hour) // may print: 13

---

# 4。使用数据格式化器setLocalizedDateFormatFromTemplate(_:)方法

Dateformatter有一个名为setLocalizedDateFormatFromTemplate(_:)的方法。setLocalizedDateFormatFromTemplate(_:)有如下声明:

func setLocalizedDateFormatFromTemplate(_ dateFormatTemplate: String)

使用指定区域设置接收方的模板的日期格式。

用法:

import Foundation

let date = Date()
let dateFormatter = DateFormatter()
dateFormatter.setLocalizedDateFormatFromTemplate("HH")
let hour = dateFormatter.string(from: date)
print(hour) // may print: 13

扩展noiiv的史诗般的简洁解决方案，这里是更简洁的Swift 3/4实现:

斯威夫特3/4

let components = Calendar.current.dateComponents([.hour, .minute], from: Date())
let (hour, minute) = (components.hour, components.minute)

同时，扩展Leo Dabus的扩展，我们可以有:

extension Date {

    func components(_ components: Set<Calendar.Component>) -> DateComponents {
        return Calendar.current.dateComponents(components, from: self)
    }

    func component(_ component: Calendar.Component) -> Int {
        return Calendar.current.component(component, from: self)
    }

    var era: Int { return component(.era) }
    var year: Int { return component(.year) }
    var month: Int { return component(.month) }
    var day: Int { return component(.day) }
    var hour: Int { return component(.hour) }
    var minute: Int { return component(.minute) }
    var second: Int { return component(.second) }
    var weekday: Int { return component(.weekday) }
    var weekdayOrdinal: Int { return component(.weekdayOrdinal) }
    var quarter: Int { return component(.quarter) }
    var weekOfMonth: Int { return component(.weekOfMonth) }
    var weekOfYear: Int { return component(.weekOfYear) }
    var yearForWeekOfYear: Int { return component(.yearForWeekOfYear) }
    var nanosecond: Int { return component(.nanosecond) }
    var calendar: Calendar? { return components([.calendar]).calendar }
    var timeZone: TimeZone? { return components([.timeZone]).timeZone }

}

像这样使用它:

let date = Date()
let (hour, minute) = (date.hour, date.minute)

迅速回答:

 let date = NSDate()
 let calendar = NSCalendar.currentCalendar()
 let components = calendar.components([.Hour, .Minute], fromDate: date)
 let hour = components.hour
 let minutes = components.minute

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