Xcode Swift am/pm time to 24 hour format

Question

I am trying to convert an am/pm format time to a 24 hour format time

6:35 PM to 18:35

I tried this piece of code on playground but it doesn't seem to work if I put the time alone

let dateAsString = "02/12/15, 6:35 PM"
let dateFormatter = NSDateFormatter()
dateFormatter.dateFormat = "HH"
let date = dateFormatter.dateFromString(dateAsString) //returns nil

Does anyone know how to accomplish this?

import UIKit let date = Date() print(" Date:",date) let dateFormatter = DateFormatter() dateFormatter.dateFormat = "h:mm a" let Date12Hr = dateFormatter.string(from: date) print("12 hour formatted Date:",Date12) this work fine in playground or Simulator ..while running in device its not converted ??? — SANTOSH, Jan 08 '20 at 11:37

score 183 · Accepted Answer · edited Jul 14 '21 at 20:57

183

Just convert it to a date using NSDateFormatter and the "h:mm a" format and convert it back to a string using the "HH:mm" format. Check out this date formatting guide to familiarize yourself with this material.

let dateAsString = "6:35 PM"
let dateFormatter = NSDateFormatter()
dateFormatter.dateFormat = "h:mm a"
dateFormatter.locale = Locale(identifier: "en_US_POSIX") // fixes nil if device time in 24 hour format
let date = dateFormatter.dateFromString(dateAsString)

dateFormatter.dateFormat = "HH:mm"
let date24 = dateFormatter.stringFromDate(date!)

edited Jul 14 '21 at 20:57

SwiftiSwift

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answered Mar 28 '15 at 20:17

Ian

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21

This code gives nil if device time in 24 hour format. Any advice? – Tejinder Oct 26 '16 at 05:28
23

try this Add following line after dateFormatter declaration. dateFormatter.locale = NSLocale(localeIdentifier: "en_US_POSIX") as Locale! This resolve my issue. – Nipul Daki Sep 18 '17 at 08:43
2

@Tejinder @ Nipul Daki I gave locale identifier and problem is solved! formatter.locale = Locale(identifier: "en_US_POSIX") – Burcu Kutluay Apr 06 '21 at 07:39
1

but why does it even return nil when the device is in 24 hours format? Why does it even effect the date (of nil) when specifying the dateFormat itself? @BurcuKutluay – SwiftiSwift Jul 14 '21 at 21:01
Thanks for mentioning the reason of you using an explicit locale – Mojtaba Hosseini Aug 26 '21 at 13:49
1

@BurcuKutluay Thank you. ```dateFormatter.locale = Locale(identifier: "en_US_POSIX") ``` this line saved my time. – Badal Shah Jan 25 '22 at 18:19

score 69 · Answer 2 · edited Apr 09 '18 at 06:32

69

Swift 3

Time format 24 hours to 12 hours

let dateAsString = "13:15"
let dateFormatter = DateFormatter()
dateFormatter.dateFormat = "HH:mm"

let date = dateFormatter.date(from: dateAsString)
dateFormatter.dateFormat = "h:mm a"
let Date12 = dateFormatter.string(from: date!)
print("12 hour formatted Date:",Date12)

output will be 12 hour formatted Date: 1:15 PM

Time format 12 hours to 24 hours

let dateAsString = "1:15 PM"
let dateFormatter = DateFormatter()
dateFormatter.dateFormat = "h:mm a"

let date = dateFormatter.date(from: dateAsString)
dateFormatter.dateFormat = "HH:mm"

let Date24 = dateFormatter.string(from: date!)
print("24 hour formatted Date:",Date24)

output will be 24 hour formatted Date: 13:15

edited Apr 09 '18 at 06:32

CodeBender

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answered May 05 '17 at 09:45

Azharhussain Shaikh

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When changing from 24-hour to 12-hour format, I need to add dateFormatter.locale = Locale(identifier: "en_US_POSIX") to force it to ignore device locale. – Sunly Jun 21 '18 at 03:36
it is just a conversion of the date! – Azharhussain Shaikh Jun 21 '18 at 05:35
2

You can try setting device to 24-hour format. The code above doesn't work in my case. – Sunly Jun 22 '18 at 04:29
1

This is the only thing that worked for my out of all the crap I found out there to transform AM/PM time into 24h time. Thanks – C. Hellmann Apr 24 '21 at 23:07

Anupam Mishra · Answer 3 · 2019-06-01T13:50:00.783

Swift 3 *

Code to convert 12 hours (i.e. AM and PM) to 24 hours format which includes-

Hours:Minutes:Seconds:AM/PM to Hours:Minutes:Seconds

func timeConversion24(time12: String) -> String {
    let dateAsString = time12
    let df = DateFormatter()
    df.dateFormat = "hh:mm:ssa"

    let date = df.date(from: dateAsString)
    df.dateFormat = "HH:mm:ss"

    let time24 = df.string(from: date!)
    print(time24)
    return time24
}

Input

07:05:45PM

Output

19:05:45

Similarly

Code to convert 24 hours to 12 hours (i.e. AM and PM) format which includes-

Hours:Minutes:Seconds to Hours:Minutes:Seconds:AM/PM

func timeConversion12(time24: String) -> String {
    let dateAsString = time24
    let df = DateFormatter()
    df.dateFormat = "HH:mm:ss"

    let date = df.date(from: dateAsString)
    df.dateFormat = "hh:mm:ssa"

    let time12 = df.string(from: date!)
    print(time12)
    return time12
}

Input

19:05:45

Output

07:05:45PM

score 6 · Answer 4 · answered Oct 27 '20 at 02:57

Here is the answer with more extra format.

** Xcode 12, Swift 5.3 **

let dateFormatter = DateFormatter()
dateFormatter.dateFormat = "HH:mm:ss"
var dateFromStr = dateFormatter.date(from: "12:16:45")!

dateFormatter.dateFormat = "hh:mm:ss a 'on' MMMM dd, yyyy"
//Output: 12:16:45 PM on January 01, 2000

dateFormatter.dateFormat = "E, d MMM yyyy HH:mm:ss Z"
//Output: Sat, 1 Jan 2000 12:16:45 +0600

dateFormatter.dateFormat = "yyyy-MM-dd'T'HH:mm:ssZ"
//Output: 2000-01-01T12:16:45+0600

dateFormatter.dateFormat = "EEEE, MMM d, yyyy"
//Output: Saturday, Jan 1, 2000

dateFormatter.dateFormat = "MM-dd-yyyy HH:mm"
//Output: 01-01-2000 12:16

dateFormatter.dateFormat = "MMM d, h:mm a"
//Output: Jan 1, 12:16 PM

dateFormatter.dateFormat = "HH:mm:ss.SSS"
//Output: 12:16:45.000

dateFormatter.dateFormat = "MMM d, yyyy"
//Output: Jan 1, 2000

dateFormatter.dateFormat = "MM/dd/yyyy"
//Output: 01/01/2000

dateFormatter.dateFormat = "hh:mm:ss a"
//Output: 12:16:45 PM

dateFormatter.dateFormat = "MMMM yyyy"
//Output: January 2000

dateFormatter.dateFormat = "dd.MM.yy"
//Output: 01.01.00

//Output: Customisable AP/PM symbols
dateFormatter.amSymbol = "am"
dateFormatter.pmSymbol = "Pm"
dateFormatter.dateFormat = "a"
//Output: Pm

// Usage
var timeFromDate = dateFormatter.string(from: dateFromStr)
print(timeFromDate)

score 5 · Answer 5 · answered Jul 17 '17 at 20:29

Below is the swift 3 version of the solution -

let dateAsString = "6:35:58 PM"
let dateFormatter = DateFormatter()
dateFormatter.dateFormat = "h:mm:ss a"
let date = dateFormatter.date(from: dateAsString)

dateFormatter.dateFormat = "HH:mm:ss"
let date24 = dateFormatter.string(from: date!)
print(date24)

Shobhakar Tiwari · Answer 6 · 2017-09-05T19:37:48.013

4

Swift version 3.0.2 , Xcode Version 8.2.1 (8C1002) (12 hr format ):

func getTodayString() -> String{

        let formatter = DateFormatter()
        formatter.dateFormat = "h:mm:ss a "
        formatter.amSymbol = "AM"
        formatter.pmSymbol = "PM"

        let currentDateStr = formatter.string(from: Date())
        print(currentDateStr)
        return currentDateStr 
}

OUTPUT : 12:41:42 AM

Feel free to comment. Thanks

edited Sep 05 '17 at 19:37

answered Sep 03 '17 at 19:20

Shobhakar Tiwari

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This question is about going from 12 hour time to 24 hour time, this answer deals with going in the other direction. – Abizern Sep 04 '17 at 08:51
1

Not correct answer!! You are confused because you are testing with 12:41:42. Try 1pm or greater. – TheTiger Sep 04 '17 at 09:30
hi if a user input 6:11AM, how can i convert to 2019-03-09 13:38:32 +0000 in this format – Gorib Developer Mar 09 '19 at 12:38
so you have to use current date with time ( input provided by user) – Shobhakar Tiwari Mar 10 '19 at 08:51
this work fine in playground and Simulator ..while running in device its not converted – SANTOSH Jan 08 '20 at 10:31

score 3 · Answer 7 · edited Jan 08 '21 at 06:13

Use this function for date conversion, its working fine when your device in 24/12 hr format

See https://developer.apple.com/library/archive/qa/qa1480/_index.html

func convertDateFormatter(fromFormat:String,toFormat:String,_ dateString: String) -> String{
    let formatter = DateFormatter()
    formatter.locale = Locale(identifier: "en_US_POSIX")
    formatter.dateFormat = fromFormat
    let date = formatter.date(from: dateString)
    formatter.dateFormat = toFormat
    return  date != nil ? formatter.string(from: date!) : ""
}

score 2 · Answer 8 · edited Feb 26 '20 at 05:45

Unfortunately apple priority the device date format, so in some cases against what you put, swift change your format to 12hrs

To fix this is necessary to use setLocalizedDateFormatFromTemplate instead of dateFormat an hide the AM and PM

let formatter = DateFormatter()
formatter.setLocalizedDateFormatFromTemplate("HH:mm:ss a")
formatter.amSymbol = ""
formatter.pmSymbol = ""
formatter.timeZone = TimeZone(secondsFromGMT: 0)
var prettyDate = formatter.string(from: Date())

You can check a very useful post with more information detailed in https://prograils.com/posts/the-curious-case-of-the-24-hour-time-format-in-swift

score 1 · Answer 9 · answered Feb 22 '17 at 09:39

1

Here is code for other way around

For Swift 3

 func amAppend(str:String) -> String{
    var temp = str
    var strArr = str.characters.split{$0 == ":"}.map(String.init)
    var hour = Int(strArr[0])!
    var min = Int(strArr[1])!
    if(hour > 12){
        temp = temp + "PM"
    }
    else{
        temp = temp + "AM"
    }
    return temp
}

answered Feb 22 '17 at 09:39

Rishabh Dugar

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5
16

Shouldn't it be (hour >= 12) - since 12.00 noon is 12 p.m. and 00.00 midnight is 12 a.m. – iKK Apr 29 '20 at 19:58

score 1 · Answer 10 · answered May 21 '19 at 15:58

1

let calendar = Calendar.current
let hours    = calendar.component(.hour, from: Date())
let minutes  = calendar.component(.minute, from: Date())
let seconds  = calendar.component(.second, from: Date())

answered May 21 '19 at 15:58

koliush

186
10

This isn't military time. – WikipediaBrown Jan 05 '20 at 22:42

score 0 · Answer 11 · answered Dec 28 '15 at 09:12

I am using a function here in my case by which I am updating a label with the normal time format and after that I am storing the selected time's 24hr format to do some another tasks..

Here is my code...

func timeUpdate(sender: NSDate)
{
    let timeSave = NSDateFormatter() //Creating first object to update time label as 12hr format with AM/PM
    timeSave.timeStyle = NSDateFormatterStyle.ShortStyle //Setting the style for the time selection.
    self.TimeShowOutlet.text = timeSave.stringFromDate(sender) // Getting the string from the selected time and updating the label as 1:40 PM
    let timeCheck = NSDateFormatter() //Creating another object to store time in 24hr format.
    timeCheck.dateFormat = "HH:mm:ss" //Setting the format for the time save.
    let time = timeCheck.stringFromDate(sender) //Getting the time string as 13:40:00
    self.timeSelectedForCheckAvailability = time //At last saving the 24hr format time for further task.
}

After writing this function you can call this where you are choosing the time from date/time picker.

Thanks, Hope this helped.

C. Hellmann · Answer 12 · 2021-04-25T08:52:29.113

this is similar to our friends answer: https://stackoverflow.com/a/43801717/2796837 but using all our internet friends ideas I came up with the following more complete singular solution:

let amPmFormat = "h:mm a"
let twentyFourHFormat = "HH:mm"
func hourMinuteParser(date: Date) -> KotlinInt{
    let formatter = DateFormatter()
    if DateFormatter.dateFormat(fromTemplate: "j",options:0, locale: Locale.current)!.contains("a") {
        formatter.dateFormat = amPmFormat
    }else{
        formatter.dateFormat = twentyFourHFormat
    }
    let stringTime = formatter.string(from: date)
    let time = formatter.date(from: stringTime)
    formatter.dateFormat = twentyFourHFormat

    let time24 = formatter.string(from: time!)
    let timeWithoutSpecialCharacters = time24.replacingOccurrences(of: ":", with: "")
    let int2 = Int32(timeWithoutSpecialCharacters) ?? 0
    return KotlinInt(int: int2)
}

This will parse your time even independent of the format it comes and outputs it into HH:mm, you could change the third format change into whatever you would want.

Xcode Swift am/pm time to 24 hour format

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