I have an extension on String to convert my date strings to a Date type in Swift 5.2
extension String {
func toDate(withFormat format: String = "MMM d, YYYY HH:mm:ss a") -> Date {
let dateFormatter = DateFormatter()
dateFormatter.locale = Locale(identifier: "en_US")
dateFormatter.calendar = Calendar(identifier: .iso8601)
dateFormatter.timeZone = .current
dateFormatter.dateFormat = format
guard let date = dateFormatter.date(from: self) else {
preconditionFailure("Check the format!!!")
}
return date
}
}
when I try this to convert my date_string is always wrong(check below) :
var sampleDate = "May 5, 2021 1:34:15 AM"
let newDate = sampleDate.toDate()
print(newDate) //prints: "2020-12-28 05:34:15 +0000\n"
My date_string that I want to convert is always in a similar format: "May 5, 2020 9:20 5:39:15 PM"
Any idea what could be wrong? I played around with local, calendar, timezone but did not work! I'm in the US East Coast timezone right now.
Thanks,
Cam
Your DateFormatter's dateFormat should be "MMM d, yyyy hh:mm:ss a"
("yyyy" instead of "YYYY" and "hh" instead of "HH")
That works.
Edit:
Or, as Leo pointed out in the comments, "MMM d, yyyy h:mm:ss a" (With only one h) would be better, and it's safer to use
dateFormatter.locale = Locale(identifier: "en_US_POSIX")
(That tells the date formatter not to try to adjust the date format for different local date formatting conventions.)
This question already has answers here:
Date does not appear in UILabel
(2 answers)
Closed 5 years ago.
I have date in string with format below code want to change in Date
but i'm getting nil
let addedDate = "Tue, 25 May 2010 12:53:58 +0000"
let formatter = DateFormatter()
formatter.dateFormat = "dd MM YYYY"
let date1 = formatter.date(from: addedDate)
print("DATE \(date1)")
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"
You have to transform your String (addedDateString) to a Date? (addedDate) then you can convert it to a String (dateString) using the format you want. Please note: addedDate is nil when conversion from String to Date failed.
import UIKit
let addedDateString = "Tue, 25 May 2010 12:53:58 +0000"
// Transform addedDateString to Date
let addedDateFormatter = DateFormatter()
addedDateFormatter.dateFormat = "E, d MMM yyyy HH:mm:ss Z"
if let addedDate = addedDateFormatter.date(from: addedDateString) {
// Converstion String to Date return a valid Date
print ("addedDate", addedDate)
let dateFormatter = DateFormatter()
dateFormatter.dateFormat = "dd MM YYYY"
let dateString = dateFormatter.string(from: addedDate)
print("Date: ", dateString)
} else {
// addedDate == nil value when conversion String to Date failed
print ("addedDateString not valid")
}
You can also make a function. Something like this:
func transformStringDate(_ dateString: String,
fromDateFormat: String,
toDateFormat: String) -> String? {
let initalFormatter = DateFormatter()
initalFormatter.dateFormat = fromDateFormat
guard let initialDate = initalFormatter.date(from: dateString) else {
print ("Error in dateString or in fromDateFormat")
return nil
}
let resultFormatter = DateFormatter()
resultFormatter.dateFormat = toDateFormat
return resultFormatter.string(from: initialDate)
}
print (transformStringDate("Tue, 25 May 2010 12:53:58 +0000",
fromDateFormat: "E, d MMM yyyy HH:mm:ss Z",
toDateFormat: "dd MM YYYY") ?? "Error")
I have a date in a string with this format "2017-03-14" (yyyy-MM-dd) and i am trying to convert it into a string with this format "Tuesday, March 14, 2017".
This is my code:
let dateFormatter = DateFormatter()
dateFormatter.dateFormat = "yyyy-MM-dd"
let date = dateFormatter.date(from: "2017-03-14")
Now if i print the value of "date", i get this:
2017-03-13 22:00:00 +0000
This is just the day before. Why is that ?
EDIT:
I need to compare date before formatting it.
var newDateString : String = ""
let date2 = Date()
let comp = date2.compare(date!)
if comp.rawValue == 0 {
newDateString = "TONIGHT"
} else {
dateFormatter.dateFormat = "EEEE, MMMM d, yyyy"
newDateString = dateFormatter.string(from: date!)
}
Thanks
The desired Format should be:
EEEE, MMMM dd, yyyy
All you have to do is to add after your code the following code snippet:
dateFormatter.dateFormat = "EEEE, MMMM dd, yyyy"
let string = dateFormatter.string(from: date!) // "Tuesday, March 14, 2017"
Remark:
I'd like to suggest to do optional binding for declaring the date, as follows:
let dateFormatter = DateFormatter()
dateFormatter.dateFormat = "yyyy-MM-dd"
if let date = dateFormatter.date(from: "2017-03-14") {
dateFormatter.dateFormat = "EEEE, MMMM dd, yyyy"
let string = dateFormatter.string(from: date) // "Tuesday, March 14, 2017"
}
Your confusion is based on a misunderstanding of what Time and Date are. Evidently, you are currently located in a time zone that is 2 hours ahead of UTC (Coordinated Universal Time), previously known as Greenwich Mean Time (GMT).
When you ask the OS for a Date object converted from "2017-03-14" you get a date/time reference of Midnight the morning of 2017-03-14 in your time zone which is, correctly, 10:00 pm (22:00) then night before in UTC.
When you ask the OS for a Date object for now with Date() you get a date/time reference of now in your time zone, which will be two hours earlier in UTC.
To accurately evaluate your date string to say "is now earlier than 'tonight of 2017-03-14'" you will probably want to convert from "2017-03-14 23:59" (or 11:59 pm, or perhaps prior to the start of tonight's event of 8:00 pm, etc).
This will do your original comparison, but would work better as a function (although I'm not sure how you want to use it)...
var newDateString : String = ""
let dateFormatter = DateFormatter()
dateFormatter.dateFormat = "yyyy-MM-dd HH:mm"
// set tonightDate to 1 minute before midnight, tonight, in local time
if let tonightDate = dateFormatter.date(from: "2017-03-14 23:59") {
// set nowDate to current local time
let nowDate = Date()
let comp = nowDate.compare(tonightDate)
if comp.rawValue <= 0 {
newDateString = "TONIGHT"
} else {
dateFormatter.dateFormat = "EEEE, MMMM d, yyyy"
newDateString = dateFormatter.string(from: tonightDate)
}
}
print(newDateString)
It is calculated time based on UTC so you are getting day before.You can get proper format using below code:
func chageDateFormat(date:String) -> String{
let dateFormatter = NSDateFormatter()
dateFormatter.dateFormat = "yyyy-MM-dd"
guard let date = dateFormatter.dateFromString(date) else {
assert(false, "No date from string")
return ""
}
print(date)
dateFormatter.dateFormat = "EEEE, dd MMMM, yyyy"
let result = dateFormatter.stringFromDate(date)
return result
}
let resultFormateDate = chageDateFormat("2017-03-14")
For comparison you also need to convert Date() to proper format.Both date must be in same format.
let dateFormatter = NSDateFormatter()
dateFormatter.dateFormat = "yyyy-MM-dd"
let date = NSDate()
let strdate = dateFormatter.stringFromDate(date)
let resultFormateDate2 = chageDateFormat(strdate)
Now you can compare two strings
if resultFormateDate == resultFormateDate2{
print("True")
}
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/
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.