Changing Date Format on iOS

How to change date format in iOS

the dateFormat = @"yyyy-MM-dd'T'HH:mm:ssxxx" to convert your NSString to NSDate

Code:

NSString *myString = @"2015-06-08T00:00:00+02:00";
NSDateFormatter *formatter = [[NSDateFormatter alloc] init];
formatter.dateFormat = @"yyyy-MM-dd'T'HH:mm:ssxxx";
NSDate * myDate = [formatter dateFromString:myString];
formatter.dateFormat = @"dd/MM/yyyy";
NSString *newString = [formatter stringFromDate:myDate];
NSLog(@"%@",newString);

See ICU Formatting Dates and Times to format DateTime

How to convert date format from dd/MM/YYYY to YYYY-MM-dd in swift

First changes your year formatter with yyyy and instead of using two NSDateFormatter use just one like this

let inputFormatter = NSDateFormatter()
inputFormatter.dateFormat = "MM/dd/yyyy"
let showDate = inputFormatter.dateFromString("07/21/2016")
inputFormatter.dateFormat = "yyyy-MM-dd"
let resultString = inputFormatter.stringFromDate(showDate!)
print(resultString)

For Swift3 and later

let dateFormatter = DateFormatter()
dateFormatter.dateFormat = "MM/dd/yyyy"
let date = dateFormatter.date(from: date)
dateFormatter.dateFormat = "yyyy-MM-dd"
let resultString = dateFormatter.string(from: date!)
print(resultString)

Swift date format returning wrong date

The code in your question is muddled up. You try to convert a string into a string in the first example and something unspecified into a Date in the second example.

Here's how to convert a Date into a String:

import Foundation

let formatter = DateFormatter()
formatter.locale = Locale(identifier: "en_US_POSIX")
formatter.dateFormat = "yyyy-MM-dd'T'HH:mm:ssXXXXX"
let string: String = formatter.string(from: Date())

print(string) // prints for example 2020-10-18T10:54:07+01:00

Here's how to convert a string into a date

let formatter = DateFormatter()
formatter.locale = Locale(identifier: "en_US_POSIX")
formatter.dateFormat = "yyyy-MM-dd' 'HH:mm:ssZ"
let date: Date = formatter.date(from: "2020-10-18 10:59:56+0100")! // In real life, handle the optional properly
print(date)  // prints 2020-10-18 09:59:56 +0000

When you print a Date directly, it automatically uses UTC as the time zone. This is why it changed it in the code above.

In the examples, I explicitly specified the type of string and date to show what type they are. Type inference means you can omit these in normal code.

As a general rule when handling dates:

• always use Date in your code. Date is a type that stores the number of seconds since Jan 1st 1970 UTC.
• Only convert dates to strings when displaying them to the user or communicating with an external system.
• When calculating periods etc, always use a Calendar to get things like date components and intervals in units other than seconds. You might think to get "the same time tomorrow" you could just add 24 * 60 * 60 to a Date but in many countries, like mine, that will work on only 363 days in the year. Calendar will correctly handle things like daylight saving and leap years.

Changing date format on iOS

To convert from 1 string to the other use the following

NSString *inputString = @"2012-06-26 12:00:00 +0000";
NSDateFormatter *formatter = [[NSDateFormatter alloc] init];
[formatter setDateFormat:@"yyyy-MM-dd hh:mm:ss z"];//input

NSDate *date = [formatter dateFromString:inputString];

[formatter setDateFormat:@"MMM dd, yyyy hh:mm:ss a"];
NSString *outputString = [formatter stringFromDate:date];
NSLog(@"output : %@",outputString);

iOS 15.4 Date Format Sep now Sept

Assuming this problem occurs just for September and on iOS 15.4, then
a quick work around, is to replace "Sept" with "Sep", using

 dateTextField.text = dateFormatter.string(from: (datePicker?.date )!)

 if dateTextField.text.contains("Sept") {
     dateTextField.text = dateTextField.text.replacingOccurrences(of: "Sept", with: "Sep")
 }

Date Format in Swift

You have to declare 2 different NSDateFormatters, the first to convert the string to a NSDate and the second to print the date in your format.

Try this code:

let dateFormatterGet = NSDateFormatter()
dateFormatterGet.dateFormat = "yyyy-MM-dd HH:mm:ss"

let dateFormatterPrint = NSDateFormatter()
dateFormatterPrint.dateFormat = "MMM dd,yyyy"

let date: NSDate? = dateFormatterGet.dateFromString("2016-02-29 12:24:26")
print(dateFormatterPrint.stringFromDate(date!))

Swift 3 and higher:

From Swift 3 NSDate class has been changed to Date and NSDateFormatter to DateFormatter.

let dateFormatterGet = DateFormatter()
dateFormatterGet.dateFormat = "yyyy-MM-dd HH:mm:ss"

let dateFormatterPrint = DateFormatter()
dateFormatterPrint.dateFormat = "MMM dd,yyyy"

if let date = dateFormatterGet.date(from: "2016-02-29 12:24:26") {
    print(dateFormatterPrint.string(from: date))
} else {
   print("There was an error decoding the string")
}

How to convert date from server in Swift?

You need to learn a bit more about how to set the dateFormat string. You forgot the Z in the string. Also as a warning. Creating date formatter objects is extremely expensive. Do not create a new one for every date you want to format. Be sure to cache it and reuse it.

import Foundation

let serverDateFormatter:DateFormatter = {
    let result = DateFormatter()
    result.dateFormat = "yyyy-MM-dd'T'HH:mm:ss.SZ"
    result.locale = Locale(identifier: "en_US_POSIX")
    result.timeZone = TimeZone(secondsFromGMT: 0)
    return result
}()

let date = "2021-09-08T20:52:47.001Z"
let dateformat = serverDateFormatter.date(from: date)

print(dateformat as Any)

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