Getting error when converting date format error | Swift - swift

Essentially I would like to convert the following:
2022-07-01 14:35:00
To simply:
July 1st
The following is what I currently have because the initial input is string, but when I'm converting from string to date time the hour seems to have +2 hours added to it. Why is this happening?
// Create String
let string = "2022-07-01 14:35:00"
// Create Date Formatter
let dateFormatter = DateFormatter()
// Set Date Format
dateFormatter.dateFormat = "yyyy-MM-dd HH:mm:ss"
// Convert String to Date
let newdate = dateFormatter.date(from: string)
print(newdate!)

Time depends on where you are. So in this case the +2 hours you see, may be due to the difference in TimeZone. So adjust the TimeZone in the format to match the original place, or put everything in GMT TimeZone, or a common TimeZone of your choosing. Alternatively, keep the time difference.
Try something like this:
let string = "2022-07-01 14:35:00"
let readFormatter = DateFormatter()
readFormatter.timeZone = TimeZone(abbreviation: "GMT") // <-- here adjust
readFormatter.dateFormat = "yyyy-MM-dd HH:mm:ss"
let writeFormatter = DateFormatter()
writeFormatter.timeZone = TimeZone(abbreviation: "GMT") // <-- here adjust
writeFormatter.dateFormat = "LLLL dd"
if let theDate = readFormatter.date(from: string) {
print("\n----> theDate: \(theDate)") // ----> theDate: 2022-07-01 14:35:00 +0000
let simpleDate = writeFormatter.string(from: theDate)
print("\n----> simpleDate: \(simpleDate)") // ----> simpleDate: July 01
}

Related

Date format from url (JSON)

How would I be able to take the date format from a URL and turn It into 2 separate date values in SwiftUI. The format from JSON is 2019-11-06 18:30:00 and I'm trying to get it to show as Dec 5 and would also like it to separate the time and show 8:00PM, is this possible?
This is the code that references the start time:
let startTime: String
var startTime: String {
return self.post.startTime
}
Let's step around the fact that 2019-11-06 18:30:00 can't be represented as Dec 5 and 8:00PM and focus on the work flow you'd need.
The basic idea is to:
Convert the String to a Date, via a DateFormatter
Use a custom DateFormatter to format the Date to the required "date" value
Use a custom DateFormatter to format the Date to the required "time" value
This might look something like...
let startTime = "2019-11-06 18:30:00"
let formatter = DateFormatter()
formatter.dateFormat = "yyyy-MM-dd HH:mm:ss"
if let date = formatter.date(from: startTime) {
let dateFormatter = DateFormatter()
dateFormatter.dateFormat = "MMM d"
let dateString = dateFormatter.string(from: date)
let timeFormatter = DateFormatter()
timeFormatter.dateFormat = "h:ma"
let timeString = timeFormatter.string(from: date)
} else {
print("Bad date/format")
}
In my testing, this outputs Nov 6 and 6:30PM
you can pass your string date to date with this function
func stringToDate(date: String, format: String) -> Date
{
let date2 = date.count == 0 ? getCurrentDate(format: "dd-MM-yyyy") : date
let dateFormatter = DateFormatter()
dateFormatter.timeZone = TimeZone.init(identifier: "América/Mexico_City")
dateFormatter.dateFormat = format
let dateDate = dateFormatter.date(from: date2)
return dateDate!
}
func getCurrentDate(format: String) -> String
{
let formD = DateFormatter()
formD.dateFormat = format
let str = formD.string(from:Date())
return str
}
let dateA = stringToDate(date: "2019-11-06 18:30:00", format: "yyyy-MM-dd HH:mm:ss")
if dateA < Date() //Date() always will be the current date, including the time
{
print("dateA is older")
}
else
{
print("dateA in newer")
}
play with the format examples formats

Date (String) to Date (ISO) at Swift

I am aware about similar questions, however, I couldn't find this exact one:
In an iOS application, I am receiving a date in the format dd-MM-yyyy HH:mm:ss (i.e. 30-07-2019 12:05:00) in GMT +2h, and I like to convert it to yyyy-MM-dd HH:mm:ss +0000 in GMT ±0h (i.e. 2019-07-30 10:05:00 +0000).
How can I do this?
Firstly create 2 DateFormatter.
First dateFormat for create date from dateString.
Second dateFormat for create string from created date.
Code:
let dateString = "30-07-2019 12:05:00"
let dateFormatForDate = DateFormatter()
dateFormatForDate.timeZone = TimeZone(abbreviation: "GMT+2")
dateFormatForDate.dateFormat = "dd-MM-yyyy HH:mm:ss"
//date
let date = dateFormatForDate.date(from: dateString)
let dateFormatForString = DateFormatter()
dateFormatForString.timeZone = TimeZone(abbreviation: "GMT")
dateFormatForString.dateFormat = "yyyy-MM-dd HH:mm:ss +0000"
//string
let formattedDateString = dateFormatForString.string(from: date!)
Result:
dateString: 30-07-2019 12:05:00
formattedDateString: 2019-07-30 09:05:00 +0000
extension Date {
func convert(_ from: TimeZone, toTimeZone: TimeZone) -> Date {
let delta = TimeInterval(toTimeZone.secondsFromGMT() - from.secondsFromGMT())
return addingTimeInterval(delta)
}
}
let dateFmt = DateFormatter()
dateFmt.timeZone = TimeZone(abbreviation: "GMT+2")
dateFmt.dateFormat = "dd-MM-yyyy HH:mm:ss"
if let date = dateFmt.date(from: "30-07-2019 12:05:00") {
let localDate = date.convert(TimeZone(abbreviation: "GMT+02")!, toTimeZone: TimeZone(abbreviation: "GMT+00")!)
}

Getting wrong date when converting string with timezone

In Swift Playground, I run this.
let string = "2019-01-14T00:00:00+08:00"
let utcTimezone = TimeZone(abbreviation: "UTC")!
let sgtTimezone = TimeZone(abbreviation: "SGT")!
let dfs = DateFormatter()
dfs.timeZone = sgtTimezone
dfs.locale = Locale(identifier: "en_sg")
dfs.dateFormat = "yyyy-MM-dd'T'HH:mm:ssZZZ"
dfs.calendar = Calendar(identifier: Calendar.Identifier.iso8601)
let date = dfs.date(from: string)!
Why is date = Jan 13, 2019 at 11:00 PM and not the accurate Jan 14, 2019 at 00:00 AM ?
Tried changing the timezone to UTC but by default the result is UTC
I am expecting Jan 14, 2019 at 00:00 AM.. or at least Jan 14
// This lets us parse a date from the server using the RFC3339 format
let rfc3339DateFormatter = DateFormatter()
rfc3339DateFormatter.locale = Locale(identifier: "en_US_POSIX")
rfc3339DateFormatter.dateFormat = "yyyy-MM-dd'T'HH:mm:ssZZZZZ"
rfc3339DateFormatter.timeZone = TimeZone(secondsFromGMT: 0)
// This string is just a human readable format.
// The timezone at the end of this string does not mean your date
// will magically contain this timezone.
// It just tells the parser what timezone to use to convert this
// string into a date which is basically just seconds since epoch.
let string = "2019-01-14T00:00:00+08:00"
// At this point the date object has no timezone
let shiftDate = rfc3339DateFormatter.date(from: string)!
// If you want to keep printing in SGT, you have to give the formatter an SGT timezone.
let printFormatter = DateFormatter()
printFormatter.dateStyle = .none
printFormatter.timeStyle = .full
printFormatter.timeZone = TimeZone(abbreviation: "SGT")!
let formattedDate = printFormatter.string(from: shiftDate)
You will notice that it prints 12am. There is nothing wrong with your code. You just misunderstand the Date object. Most people do.
Edit: I used the RFC formatter found in the Apple docs here. The result is the same if you use your formatter. And yes, as rmatty said, there are a few things wrong with your formatter (I stand corrected :))

How to convert a String to NSdate?

I am trying to convert fajerTime to NSDate. When I compile the project the dateValue is nil. Any idea how to fix this issue?
if prayerCommingFromAdan.id == 0 && prayerCommingFromAdan.ringToneId != 0{
// NSNotificationCenter.defaultCenter().addObserver(self, selector: #selector(YourClassName.methodOfReceivedNotification(_:)), name:"NotificationIdentifier", object: nil)
let fajerTime = "\(prayer0.time[0...1]):\(prayer0.time[3...4])" as String
var dateFormatter = NSDateFormatter()
dateFormatter.dateFormat = "MM-dd-yyyy"
dateFormatter.timeZone = NSTimeZone.localTimeZone()
// convert string into date
let dateValue = dateFormatter.dateFromString(fajerTime) as NSDate!
print(dateValue)
var dateComparisionResult:NSComparisonResult = NSDate().compare(dateValue)
if dateComparisionResult == NSComparisonResult.OrderedDescending {
addNotificationAlarm(year, month: month, day: day, hour: prayer0.time[0...1], minutes: prayer0.time[3...4], soundId: prayerCommingFromAdan.ringToneId, notificationBody: "It is al fajr adan")
}
The problem seems be the format of fajerTime. It looks like fajerTime is a time string, e.g. 12:34, whereas the date formatter is configured to accept string containing a month, day and year, e.g. 24-07-2016.
You need to format fajerTime to include the year, month and day, as well as the time. Also configure the date formatter to accept the full date and time.
Assuming prayer0 is an array, you will also need to combine the elements into a string, using joinWithSeparator.
e.g.
let hours = prayer0.time[0...1].joinWithSeparator("")
let minutes = prayer0.time[3...4].joinWithSeparator("")
let fajerTime = "\(month)-\(day)-\(year) \(hours):\(minutes)"
var dateFormatter = NSDateFormatter()
dateFormatter.dateFormat = "MM-dd-yyyy hh:mm"
dateFormatter.timeZone = NSTimeZone.localTimeZone()
// convert string into date
let dateValue = dateFormatter.dateFromString(fajerTime) as NSDate!
Please follow example (Swift 3):
let dateStr = "2016-01-15 20:10:01 +0000"
let dateFormatter = DateFormatter()
dateFormatter.dateFormat = "yyyy-MM-dd HH:mm:ss Z"
let myDate = dateFormatter.date(from: dateStr)
Keep in mind:
Date format e.g. "yyyy-MM-dd HH:mm:ss Z" must match the date string pattern
In your case, your date string contains only time, yet, your date
formatter contains only date
When using dateFormatter.date() there is no need to cast it to Date as it returns a Date:
Helpful website for date formats:
http://nsdateformatter.com/

Convert string to date in Swift

How can I convert this string "2016-04-14T10:44:00+0000" into an NSDate and keep only the year, month, day, hour?
The T in the middle of it really throws off what I am used to when working with dates.
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)
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)!
Try the following Date Format.
let dateFormatter = NSDateFormatter()
dateFormatter.dateFormat = "yyyy'-'MM'-'dd'T'HH':'mm':'ssZZZ"
let date = dateFormatter.dateFromString(strDate)
For Swift 4.1:
let dateFormatter = DateFormatter()
dateFormatter.dateFormat = "yyyy'-'MM'-'dd'T'HH':'mm':'ssZZZ"
let date = dateFormatter.date(from: strDate)
In Swift 4.1 you can do:
func getDate() -> Date? {
let dateFormatter = DateFormatter()
dateFormatter.dateFormat = "yyyy-MM-dd'T'HH:mm:ss"
dateFormatter.timeZone = TimeZone.current
dateFormatter.locale = Locale.current
return dateFormatter.date(from: "2015-04-01T11:42:00") // replace Date String
}
Swift 3.0 - 4.2
import Foundation
extension String {
func toDate(withFormat format: String = "yyyy-MM-dd HH:mm:ss")-> Date?{
let dateFormatter = DateFormatter()
dateFormatter.timeZone = TimeZone(identifier: "Asia/Tehran")
dateFormatter.locale = Locale(identifier: "fa-IR")
dateFormatter.calendar = Calendar(identifier: .gregorian)
dateFormatter.dateFormat = format
let date = dateFormatter.date(from: self)
return date
}
}
extension Date {
func toString(withFormat format: String = "EEEE ، d MMMM yyyy") -> String {
let dateFormatter = DateFormatter()
dateFormatter.locale = Locale(identifier: "fa-IR")
dateFormatter.timeZone = TimeZone(identifier: "Asia/Tehran")
dateFormatter.calendar = Calendar(identifier: .persian)
dateFormatter.dateFormat = format
let str = dateFormatter.string(from: self)
return str
}
}
make global function
func convertDateFormat(inputDate: String) -> String {
let olDateFormatter = DateFormatter()
olDateFormatter.dateFormat = "yyyy-MM-dd'T'HH:mm:ss"
let oldDate = olDateFormatter.date(from: inputDate)
let convertDateFormatter = DateFormatter()
convertDateFormatter.dateFormat = "MMM dd yyyy h:mm a"
return convertDateFormatter.string(from: oldDate!)
}
Called function and pass value in it
get_OutputStr = convertDateFormat(inputDate: "2019-03-30T05:30:00+0000")
and here is output
Feb 25 2020 4:51 PM
Swift 5. To see IF A DATE HAS PASSED:
let expiryDate = "2020-01-10" // Jan 10 2020
let dateFormatter = DateFormatter()
dateFormatter.dateFormat = "yyyy-MM-dd"
if Date() < dateFormatter.date(from: expiryDate) ?? Date() {
print("Not Yet expiryDate")
} else {
print("expiryDate has passed")
}
Converting string to Date in swift using the string extension
Swift - 5.0
extension String {
public enum DateFormatType {
/// The ISO8601 formatted year "yyyy" i.e. 1997
case isoYear
/// The ISO8601 formatted year and month "yyyy-MM" i.e. 1997-07
case isoYearMonth
/// The ISO8601 formatted date "yyyy-MM-dd" i.e. 1997-07-16
case isoDate
/// The ISO8601 formatted date and time "yyyy-MM-dd'T'HH:mmZ" i.e. 1997-07-16T19:20+01:00
case isoDateTime
/// The ISO8601 formatted date, time and sec "yyyy-MM-dd'T'HH:mm:ssZ" i.e. 1997-07-16T19:20:30+01:00
case isoDateTimeSec
/// The ISO8601 formatted date, time and millisec "yyyy-MM-dd'T'HH:mm:ss.SSSZ" i.e. 1997-07-16T19:20:30.45+01:00
case isoDateTimeMilliSec
/// The dotNet formatted date "/Date(%d%d)/" i.e. "/Date(1268123281843)/"
case dotNet
/// The RSS formatted date "EEE, d MMM yyyy HH:mm:ss ZZZ" i.e. "Fri, 09 Sep 2011 15:26:08 +0200"
case rss
/// The Alternative RSS formatted date "d MMM yyyy HH:mm:ss ZZZ" i.e. "09 Sep 2011 15:26:08 +0200"
case altRSS
/// The http header formatted date "EEE, dd MM yyyy HH:mm:ss ZZZ" i.e. "Tue, 15 Nov 1994 12:45:26 GMT"
case httpHeader
/// A generic standard format date i.e. "EEE MMM dd HH:mm:ss Z yyyy"
case standard
/// A custom date format string
case custom(String)
/// The local formatted date and time "yyyy-MM-dd HH:mm:ss" i.e. 1997-07-16 19:20:00
case localDateTimeSec
/// The local formatted date "yyyy-MM-dd" i.e. 1997-07-16
case localDate
/// The local formatted time "hh:mm a" i.e. 07:20 am
case localTimeWithNoon
/// The local formatted date and time "yyyyMMddHHmmss" i.e. 19970716192000
case localPhotoSave
case birthDateFormatOne
case birthDateFormatTwo
///
case messageRTetriveFormat
///
case emailTimePreview
var stringFormat:String {
switch self {
//handle iso Time
case .birthDateFormatOne: return "dd/MM/YYYY"
case .birthDateFormatTwo: return "dd-MM-YYYY"
case .isoYear: return "yyyy"
case .isoYearMonth: return "yyyy-MM"
case .isoDate: return "yyyy-MM-dd"
case .isoDateTime: return "yyyy-MM-dd'T'HH:mmZ"
case .isoDateTimeSec: return "yyyy-MM-dd'T'HH:mm:ssZ"
case .isoDateTimeMilliSec: return "yyyy-MM-dd'T'HH:mm:ss.SSSZ"
case .dotNet: return "/Date(%d%f)/"
case .rss: return "EEE, d MMM yyyy HH:mm:ss ZZZ"
case .altRSS: return "d MMM yyyy HH:mm:ss ZZZ"
case .httpHeader: return "EEE, dd MM yyyy HH:mm:ss ZZZ"
case .standard: return "EEE MMM dd HH:mm:ss Z yyyy"
case .custom(let customFormat): return customFormat
//handle local Time
case .localDateTimeSec: return "yyyy-MM-dd HH:mm:ss"
case .localTimeWithNoon: return "hh:mm a"
case .localDate: return "yyyy-MM-dd"
case .localPhotoSave: return "yyyyMMddHHmmss"
case .messageRTetriveFormat: return "yyyy-MM-dd'T'HH:mm:ssZZZZZ"
case .emailTimePreview: return "dd MMM yyyy, h:mm a"
}
}
}
func toDate(_ format: DateFormatType = .isoDate) -> Date?{
let dateFormatter = DateFormatter()
dateFormatter.dateFormat = format.stringFormat
let date = dateFormatter.date(from: self)
return date
}
}
we use like
string.toDate(.isoDate)
"1997-05-24".toDate(.isoDate)
Hi You have separate T Format and then convert as you like
// create dateFormatter with UTC time format
let dateFormatter = NSDateFormatter()
dateFormatter.dateFormat = "yyyy-MM-dd'T'HH:mm:ss"
dateFormatter.timeZone = NSTimeZone(name: "UTC")
let date = dateFormatter.dateFromString("2015-04-01T11:42:00")
// change to a readable time format and change to local time zone
dateFormatter.dateFormat = "EEE, MMM d, yyyy - h:mm a"
dateFormatter.timeZone = NSTimeZone.localTimeZone()
let timeStamp = dateFormatter.stringFromDate(date!)
Since iOS 15.0, we can convert a String to Date in a more swift way:
let strategy = Date.ParseStrategy(format: "\(year: .defaultDigits)-\(month: .twoDigits)-\(day: .twoDigits)T\(hour: .twoDigits(clock: .twentyFourHour, hourCycle: .zeroBased)):\(minute: .twoDigits):\(second: .twoDigits)\(timeZone: .iso8601(.short))", timeZone: .current)
let date = try? Date("2016-04-14T10:44:00+0000", strategy: strategy)
Just your passing your dateformate and your date then you get Year,month,day,hour. Extra info
func GetOnlyDateMonthYearFromFullDate(currentDateFormate:NSString , conVertFormate:NSString , convertDate:NSString ) -> NSString
{
let dateFormatter = NSDateFormatter()
dateFormatter.dateFormat = currentDateFormate as String
let formatter = NSDateFormatter()
formatter.dateFormat = Key_DATE_FORMATE as String
let finalDate = formatter.dateFromString(convertDate as String)
formatter.dateFormat = conVertFormate as String
let dateString = formatter.stringFromDate(finalDate!)
return dateString
}
Get Year
let Year = self.GetOnlyDateMonthYearFromFullDate("yyyy-MM-dd'T'HH:mm:ssZ", conVertFormate: "YYYY", convertDate: "2016-04-14T10:44:00+0000") as String
Get Month
let month = self.GetOnlyDateMonthYearFromFullDate("yyyy-MM-dd'T'HH:mm:ssZ", conVertFormate: "MM", convertDate: "2016-04-14T10:44:00+0000") as String
Get Day
let day = self.GetOnlyDateMonthYearFromFullDate("yyyy-MM-dd'T'HH:mm:ssZ", conVertFormate: "dd", convertDate: "2016-04-14T10:44:00+0000") as String
Get Hour
let hour = self.GetOnlyDateMonthYearFromFullDate("yyyy-MM-dd'T'HH:mm:ssZ", conVertFormate: "hh", convertDate: "2016-04-14T10:44:00+0000") as String
I was getting crazy with this format as well.
See the solution below.
Your String that came from your back or another source:
let isoDate = "2020-05-06 20:00:00-03"
Identify the date format
let dateFormatter = DateFormatter()
dateFormatter.locale = Locale(identifier: "en_US_POSIX")
dateFormatter.dateFormat = "yyyy-MM-dd' 'HH:mm:ssZ"
let date = dateFormatter.date(from:isoDate)!
Now that you have the date as Date() you can change to whatever format you want using the formatDate.string
let formatDate = DateFormatter()
formatDate.dateFormat = "dd/MM/yyyy HH:mm"
let drawDate = formatDate.string(from: date)
print(drawDate)
Output:
06/05/2020 20:00
just
Step 1 >
get the String value from JSON or dataSource
Step 2 > create a local variable and assign it.
let startDate = CurrentDashBoard.startdate
Step 3> create an instance of DateFormatter.
let dateFormatter = DateFormatter()
step 4>
call the dateFormat from dateFormatter and provide saved date dataType.
dateFormatter.dateFormat = "MM-dd-yyyy HH:mm:ss"("may be String formate")
step 5>
Assign the Local variable to this variable to convert.
let dateFromStringstartDate : NSDate = dateFormatter.date(from: startDate)! as NSDate
Step 6>
provide your required date Formate by the following code.
dateFormatter.dateFormat = "MM/dd/yyyy HH:mm:ss"
Step 6> Assign it to label/text
cell.lblStartDate.text = String(format: "%#", strstartDate)
Code:
let startDate = CurrentDashBoard.startdate let dateFormatter = DateFormatter()
dateFormatter.dateFormat = "MM-dd-yyyy HH:mm:ss" let dateFromStringstartDate :
NSDate = dateFormatter.date(from: startDate)! as NSDate
dateFormatter.dateFormat = "MM/dd/yyyy HH:mm:ss"
let strstartDate = dateFormatter.string(from: dateFromStringstartDate as Date)
Sometimes, converting string to Date in swift can result to return nil so that you should add "!" mark to format.date function!
let dateFormatterUK = DateFormatter()
dateFormatterUK.dateFormat = "dd-MM-yyyy"
let stringDate = "11-03-2018"
let date = dateFormatterUK.date(from: stringDate)!
In swift4,
var Msg_Date_ = "2019-03-30T05:30:00+0000"
let dateFormatterGet = DateFormatter()
dateFormatterGet.dateFormat = "yyyy-MM-dd'T'HH:mm:ss"
let dateFormatterPrint = DateFormatter()
dateFormatterPrint.dateFormat = "MMM dd yyyy h:mm a" //"MMM d, h:mm a" for Sep 12, 2:11 PM
let datee = dateFormatterGet.date(from: Msg_Date_)
Msg_Date_ = dateFormatterPrint.string(from: datee ?? Date())
print(Msg_Date_)
//output :- Mar 30 2019 05:30 PM
Swift 5.6
Here is an easy way to get a string and convert it back to string with Date in structure by String extension
Date String Example "2022-03-15T07:13:49.607+00:00"
If the date is not in the format "yyyy-MM-dd'T'HH:mm:ss.SSSSSSSZ"
It will return 01-01-70
import Foundation
extension String {
func convertToDate() -> String {
let dateFormatter = DateFormatter()
dateFormatter.dateFormat = "yyyy-MM-dd'T'HH:mm:ss.SSSSSSSZ"
if let dt = dateFormatter.date(from: self) {
dateFormatter.dateFormat = "MM-dd-yy"
let formatedStringDate = dateFormatter.string(from: dt)
return formatedStringDate
}
return "01-01-70"
}
}
Just use SwifterSwift.
stringDate = "2020-04-26T08:56:17.987Z"
let date = Date(iso8601String: stringDate)
What about SwiftDate ?. The best Date and Time parsing and manipulation library for Swift.
https://github.com/malcommac/SwiftDate#1-date-parsing
Install using Cocoa Pods:
https://github.com/malcommac/SwiftDate/blob/master/Documentation/0.Informations.md#installation
And then:
import SwiftDate
// All default datetime formats (15+) are recognized automatically
let _ = "2010-05-20 15:30:00".toDate()
// You can also provide your own format!
let _ = "2010-05-20 15:30".toDate("yyyy-MM-dd HH:mm")
// All ISO8601 variants are supported too with timezone parsing!
let _ = "2017-09-17T11:59:29+02:00".toISODate()
// RSS, Extended, HTTP, SQL, .NET and all the major variants are supported!
let _ = "19 Nov 2015 22:20:40 +0100".toRSS(alt: true)
Please use an ISO8601 parsing library for doing this. There are too many ways how the string could be encoded. Don't rely on a specific format and don't rely on the server sending always the same. The problems start with the 'Z' at the end and it will extend through all varieties of the standard. A parsing library will handle all cases and will always provide a safe conversion - whereas a fixed formatting string is likely to fail in the future.
You could use one of these libraries. They are also available on CococaPods:
https://github.com/boredzo/iso-8601-date-formatter/
https://github.com/malcommac/SwiftDate
Take a look at the implementations. They are both several hundred lines long - for good reason.
With regards to the question: You can pull out the date components from the date using NSDateComponents. The example on the website covers exactly your case.
https://developer.apple.com/documentation/foundation/nscalendar/1414841-components?language=objc
Please be aware, that converting your date will take into account the time zone. You might want to set the 'locale' of the NSCalendar explicitly.