如何快速将分钟添加到当前时间

Question

I am new to Swift and am trying a scheduler. I have the start time selected and I need to add 5 minutes (or multiples of it) to the start time and display it in an UILabel ?

@IBAction func timePickerClicked(sender: UIDatePicker) {
    var dateFormatter = NSDateFormatter()
    dateFormatter.timeStyle = NSDateFormatterStyle.ShortStyle
    var dateStr = dateFormatter.stringFromDate(startTime.date)
    let sttime = dateStr
    startTimeDisplay.text = dateStr
}

// How to advance time by 5 minutes for each section based on the   start time selected and display time 
// section 1 = start time + 5
// section 2 = start time + 10*

Answer 1

Two approaches:

1. Use Calendar and date(byAdding:to:wrappingComponents:) . Eg, in Swift 3 and later:

    let calendar = Calendar.current let date = calendar.date(byAdding: .minute, value: 5, to: startDate)

2. Just use + operator (see +(_:_:) ) to add a TimeInterval (ie a certain number of seconds). Eg to add five minutes, you can:

    let date = startDate + 5 * 60

   (Note, the order is specific here: The date on the left side of the + and the seconds on the right side.)

   You can also use addingTimeInterval , if you'd prefer:

    let date = startDate.addingTimeInterval(5 * 60)

Bottom line, + / addingTimeInterval is easiest for simple scenarios, but if you ever want to add larger units (eg, days, months, etc.), you would likely want to use the calendrical calculations because those adjust for daylight savings, whereas addingTimeInterval doesn't.

---

For Swift 2 renditions, see the previous revision of this answer .

Answer 2

You can use Calendar's method

func date(byAdding component: Calendar.Component, value: Int, to date: Date, wrappingComponents: Bool = default) -> Date?

to add any Calendar.Component to any Date . You can create a Date extension to add x minutes to your UIDatePicker 's date:

Xcode 8 and Xcode 9 • Swift 3.0 and Swift 4.0

extension Date {
    func adding(minutes: Int) -> Date {
        return Calendar.current.date(byAdding: .minute, value: minutes, to: self)!
    }
}

---

Then you can just use the extension method to add minutes to the sender (UIDatePicker):

let section1 = sender.date.adding(minutes: 5)
let section2 = sender.date.adding(minutes: 10)

---

Playground testing:

Date().adding(minutes: 10)  //  "Jun 14, 2016, 5:31 PM"

Answer 3

Swift 4 :

// add 5 minutes to date

let date = startDate.addingTimeInterval(TimeInterval(5.0 * 60.0))

// subtract 5 minutes from date

let date = startDate.addingTimeInterval(TimeInterval(-5.0 * 60.0))

Swift 5.1:

// subtract 5 minutes from date
transportationFromDate.addTimeInterval(TimeInterval(-5.0 * 60.0))

Answer 4

You can use in swift 4 or 5

    let date = Date()
    let dateFormatter = DateFormatter()
    dateFormatter.dateFormat = "yyyy-MM-dd H:mm:ss"
    let current_date_time = dateFormatter.string(from: date)
    print("before add time-->",current_date_time)

    //adding 5 miniuts
    let addminutes = date.addingTimeInterval(5*60)
    dateFormatter.dateFormat = "yyyy-MM-dd H:mm:ss"
    let after_add_time = dateFormatter.string(from: addminutes)
    print("after add time-->",after_add_time)

output:

before add time--> 2020-02-18 10:38:15
after add time--> 2020-02-18 10:43:15

Answer 5

You can do date arithmetic by using NSDateComponents . For example:

import Foundation

let comps = NSDateComponents()

comps.minute = 5

let cal = NSCalendar.currentCalendar()

let r = cal.dateByAddingComponents(comps, toDate: NSDate(), options: nil)

It is what you see when you try it in playground

Answer 6

NSDate.init with timeIntervalSinceNow :
Ex:

 let dateAfterMin = NSDate.init(timeIntervalSinceNow: (minutes * 60.0))

Answer 7

Save this little extension:

extension Int {

 var seconds: Int {
    return self
 }

 var minutes: Int {
    return self.seconds * 60
 }

 var hours: Int {
    return self.minutes * 60
 }

 var days: Int {
    return self.hours * 24
 }

 var weeks: Int {
    return self.days * 7
 }

 var months: Int {
    return self.weeks * 4
 }

 var years: Int {
    return self.months * 12
 }
}

Then use it intuitively like:

let threeDaysLater = TimeInterval(3.days)
date.addingTimeInterval(threeDaysLater)

Answer 8

Swift 3:

let minutes: TimeInterval = 1 * 60
let nowPlusOne = Date() + minutes

Answer 9

extension Date {
    func withAddedMinutes(minutes: Double) -> Date {
         addingTimeInterval(minutes * 60)
    }

    func withAddedHours(hours: Double) -> Date {
         withAddedMinutes(minutes: hours * 60)
    }
}

useCase

let anHourFromNow = Date().withAddedHours(hours: 1)
let aMinuteFromNow = Date().withAddedMinutes(minutes: 1)

Answer 10

In case you want unix timestamp

        let now : Date = Date()
        let currentCalendar : NSCalendar = Calendar.current as NSCalendar

        let nowPlusAddTime : Date = currentCalendar.date(byAdding: .second, value: accessTime, to: now, options: .matchNextTime)!

        let unixTime = nowPlusAddTime.timeIntervalSince1970

Answer 11

我认为最简单的将是

let minutes = Date(timeIntervalSinceNow:(minutes * 60.0))