Swift:How to Convert String to String with Time Format

Swift : How to convert String to string with time format?

You need 2 NSDateFormatters, one for dateFromString, one for stringFromDate

let inFormatter = NSDateFormatter()
inFormatter.locale = NSLocale(localeIdentifier: "en_US_POSIX")
inFormatter.dateFormat = "HH:mm"

let outFormatter = NSDateFormatter()
outFormatter.locale = NSLocale(localeIdentifier: "en_US_POSIX")
outFormatter.dateFormat = "hh:mm"

let inStr = "16:50"
let date = inFormatter.dateFromString(inStr)!
let outStr = outFormatter.stringFromDate(date)
println(outStr) // -> outputs 04:50

Swift 5

let inFormatter = DateFormatter()
inFormatter.locale = NSLocale(localeIdentifier: "en_US_POSIX") as Locale
inFormatter.dateFormat = "hh:mm:ssa"

let outFormatter = DateFormatter()
outFormatter.locale = NSLocale(localeIdentifier: "en_US_POSIX") as Locale
outFormatter.dateFormat = "hh:mm a"
 
let inStr = "16:50"       
let datess = inFormatter.date(from: inStr)!
let outStr = outFormatter.string(from: datess)
print(outstr)

How to convert string to date without change time swift

You can add a timezone to dateFormatter

dateFromat.timeZone = TimeZone(secondsFromGMT: 0)

Updated code:

let scheduleDate : String = "2020-01-25 20:11:00"
let dateFromat : DateFormatter = DateFormatter()
dateFromat.dateFormat = "yyyy-MM-dd HH:mm:ss"
dateFromat.timeZone = TimeZone.init(secondsFromGMT: 0)
let dateFromString = dateFromat.date(from: scheduleDate)
print(dateFromString as Any) 

How to convert string date time format to another format using Swift

extension String {
func convertToDateFormate(current: String, convertTo: String) -> String {
    let dateFormatter = DateFormatter()
    dateFormatter.dateFormat = current
    guard let date = dateFormatter.date(from: self) else {
        return self
    }
    dateFormatter.dateFormat = convertTo
    return  dateFormatter.string(from: date)
}
}

convert to required formate as

let dateString = "12-10-2019"
let convertedDate = dateString.convertToDateFormate(current: "dd-MM-YYYY", convertTo: "YYYY-MM-dd")

Convert string to date in Swift

• Convert the ISO8601 string to date

    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)!
  

• Get the date components for year, month, day and hour from the date

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

• Finally create a new Date object and strip minutes and seconds

    let finalDate = calendar.date(from:components)
  

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Consider also the convenience formatter ISO8601DateFormatter introduced in iOS 10 / macOS 10.12:

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

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

Converting a String to a Date in Swift

The date format needs to be for the string you are trying to convert, not the format you want back

so

formatter.dateFormat = "dd MM YYYY"

should be

formatter.dateFormat = "E, d MMM yyyy HH:mm:ss Z"

Date to String [format string] String to Date in Swift

This should fix your issue

func convertStartDate(StartDate: Date) -> Date {

    let dateFormatter = DateFormatter()
    dateFormatter.timeZone = TimeZone(secondsFromGMT: 0)
    dateFormatter.dateFormat = "yyy-MM-dd '00':'00':'01' +0000"
    let dateString = dateFormatter.string(from: StartDate)
    dateFormatter.dateFormat = "yyy-MM-dd HH:mm:ss +0000"
    let date = dateFormatter.date(from: dateString)
    print(date as Any)

    return date!
}

func convertEndDate(EndDate: Date) -> Date {

    let dateFormatter = DateFormatter()
    dateFormatter.timeZone = TimeZone(secondsFromGMT: 0)
    dateFormatter.dateFormat = "yyy-MM-dd '23':'59':'59' +0000"
    let dateString = dateFormatter.string(from: EndDate)
    dateFormatter.dateFormat = "yyy-MM-dd HH:mm:ss +0000"
    let date = dateFormatter.date(from: dateString)

    return date!
}

How Can I Make A Timer Using String In xCode

To keep things simple, here's the code. I have removed the functions that aren't relevant to the discussion - non-implemented buttons, etc.,

The simple idea is that you use numbers (Int / Double / whatever) to store variables that you are counting with, and then have helper functions to present the variable in different formats

import UIKit

class ChessTimer: UIViewController {
    var timer = Timer()

    var isTimerRunning = false

    var storedTime : Int = 0 // use an integer to store the time

    override func viewDidLoad() {
        super.viewDidLoad()

       if isTimerRunning == false {
           runTimer()
       }
    }

    func runTimer() {
        timer = Timer.scheduledTimer(timeInterval: 1, target: self,selector: (#selector(ChessTimer.updateTimer)),userInfo: nil, repeats: true)
       isTimerRunning = true
   }

    @objc func updateTimer() {
        // because we're storing the value in an Int, we don't need to convert it here
        storedTime -= 1
        if storedTime < 1 {
            timer.invalidate()
            // use the helper function to format the result for zero time as well as everything else
            // that way, if you ever change it, you only have to change in one place
            playerTimer1.text = prodTimeString(0)
            playerTimer2.text = prodTimeString(0)
         }
         else {
            playerTimer1.text = prodTimeString(storedTime)
          }
     }

    func prodTimeString(_ time: Int) -> String {
        // because there's only one parameter, and it's obvious, add '_' then you don't need the label when you call it
        let prodMinutes = time / 60 % 60
        let prodSeconds = time % 60

        return String(format: "%02d:%02d", prodMinutes, prodSeconds)
    }
}

Swift - How to convert String to Double

Swift 4.2+ String to Double

You should use the new type initializers to convert between String and numeric types (Double, Float, Int). It'll return an Optional type (Double?) which will have the correct value or nil if the String was not a number.

Note: The NSString doubleValue property is not recommended because it returns 0 if the value cannot be converted (i.e.: bad user input).

let lessPrecisePI = Float("3.14")

let morePrecisePI = Double("3.1415926536")
let invalidNumber = Float("alphabet") // nil, not a valid number

Unwrap the values to use them using if/let

if let cost = Double(textField.text!) {
    print("The user entered a value price of \(cost)")
} else {
    print("Not a valid number: \(textField.text!)")
}

You can convert formatted numbers and currency using the NumberFormatter class.

let formatter = NumberFormatter()
formatter.locale = Locale.current // USA: Locale(identifier: "en_US")
formatter.numberStyle = .decimal
let number = formatter.number(from: "9,999.99")

Currency formats

let usLocale = Locale(identifier: "en_US")
let frenchLocale = Locale(identifier: "fr_FR")
let germanLocale = Locale(identifier: "de_DE")
let englishUKLocale = Locale(identifier: "en_GB") // United Kingdom
formatter.numberStyle = .currency

formatter.locale = usLocale
let usCurrency = formatter.number(from: "$9,999.99")

formatter.locale = frenchLocale
let frenchCurrency = formatter.number(from: "9999,99€")
// Note: "9 999,99€" fails with grouping separator
// Note: "9999,99 €" fails with a space before the €

formatter.locale = germanLocale
let germanCurrency = formatter.number(from: "9999,99€")
// Note: "9.999,99€" fails with grouping separator

formatter.locale = englishUKLocale
let englishUKCurrency = formatter.number(from: "£9,999.99")

Read more on my blog post about converting String to Double types (and currency).

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