Convert date string swift

Question

I have a date string in this format:

2016-06-20T13:01:46.457+02:00

and I need to change it to something like this:

20/06/2016

Previously I have always used this library -> SwiftDate to manipulate the dates, but it doesn't work now.

I tried also something like:

let myDate = self.dateNoteDict[indexPath.row]!
    let dateFormatter = NSDateFormatter()
    dateFormatter.dateFormat = "yyyy-MM-dd hh:mm:ss.SSSSxxx"
    let date = dateFormatter.dateFromString(myDate)
    print("date -> \(date)")

but it doesn't work. How can I do?

Thanks in advance.

Solution 1

The standard ISO8601 date format with fractional seconds and time zone is

yyyy-MM-dd'T'HH:mm:ss.SSSZ

let myDate = "2016-06-20T13:01:46.457+02:00"
let dateFormatter = NSDateFormatter()
dateFormatter.locale = NSLocale(localeIdentifier: "en_US_POSIX") // edited
dateFormatter.dateFormat = "yyyy-MM-dd'T'HH:mm:ss.SSSZ"
let date = dateFormatter.dateFromString(myDate)!
dateFormatter.dateFormat = "dd/MM/yyyy"
let dateString = dateFormatter.stringFromDate(date)

Swift 3:

let myDate = "2016-06-20T13:01:46.457+02:00"
let dateFormatter = DateFormatter()
dateFormatter.locale = Locale(identifier: "en_US_POSIX") // edited
dateFormatter.dateFormat = "yyyy-MM-dd'T'HH:mm:ss.SSSZ"
let date = dateFormatter.date(from:myDate)!
dateFormatter.dateFormat = "dd/MM/yyyy"
let dateString = dateFormatter.string(from:date)

In macOS 10.13+, iOS 11+ ISO8601DateFormatter is an alternative as input formatter

let myDate = "2016-06-20T13:01:46.457+02:00"
let inputFormatter = ISO8601DateFormatter()
inputFormatter.formatOptions = [.withFullDate, .withFullTime, .withFractionalSeconds]
let date = dateFormatter.date(from:myDate)!
let outputFormatter = DateFormatter()
outputFormatter.locale = Locale(identifier: "en_US_POSIX")
outputFormatter.dateFormat = "dd/MM/yyyy"
let dateString = dateFormatter.string(from:date)

Solution 2

I always use this code while converting String to Date . (Swift 3)

extension String
{
     func  toDate( dateFormat format  : String) -> Date
    {
        let dateFormatter = DateFormatter()
        dateFormatter.dateFormat = format
        if let date = dateFormatter.date(from: self)
        {
            return date
        }
        print("Invalid arguments ! Returning Current Date . ")
        return Date()
    }
}

and just call like . .

print ( "2016-06-20T13:01:46.457+02:00".toDate(dateFormat: "yyyy-MM-dd'T'HH:mm:ss.SSSZ") )
//Capital HH for 24-Hour Time 

Solution 3

I always use this code while converting String to Date. (Swift 4.2)

    let myDate = datePicker.date
    let dateFormatter = DateFormatter()
    dateFormatter.dateFormat = "yyyy-MM-dd'T'HH:mm:ss.SSSZ"
    let date = myDate
    dateFormatter.dateFormat = "dd/MM/yyyy"
    let dateString = dateFormatter.string(from:date)
    print(dateString)

You can try manually also:

    let myDate = "2019-02-22T08:21:11+0000"
    let dateFormatter = DateFormatter()
    dateFormatter.dateFormat = "yyyy-MM-dd'T'HH:mm:ss.SSSZ"
    let date = myDate
    dateFormatter.dateFormat = "dd/MM/yyyy"
    let dateString = dateFormatter.string(from:date)
    print(dateString)

Comments

[Jigen]

It works. Thanks for help and for the explanation. +1

[tmuecksch]

NSDateFormatter() is deprecated since Swift 3

[Samarth Kejriwal]

This conversion gives me the date in UTC, i want to convert it into my local date

[Leo Dabus]

For fixed date formats you need to set the date formatter locale to "en_US_POSIX"

[Leo Dabus]

If you're working with fixed-format dates, first set the locale of the date formatter to something appropriate for your fixed format. In most cases the best locale to choose is en_US_POSIX, a locale that's specifically designed to yield US English results regardless of both user and system preferences. en_US_POSIX is also invariant in time (if the US, at some point in the future, changes the way it formats dates, en_US will change to reflect the new behavior, but en_US_POSIX will not), and between platforms (works the same on iPhone OS as it does on OS X, and as it does on other platforms)

[Leo Dabus]

Resuming it might fail if the user uses 12h instead of 24h time format

[Leo Dabus]

This will actually return now as a Date in case the date string parsing fails. You should change the return type to optional and return nil in case of failure.

[NickCoder]

This is a perfect solution and worked like a charm.