How to convert String to Date to String in Swift?

Question

I have this type of string, "2019-03-22", and want to convert it to this string, "March 22, 2019", in Swift.

It looks simple and I tried a few different ways. But I haven't figured it out yet.

The best code I have is this:

let originalDate = "2019-03-22"
let dateFormatter = DateFormatter()
dateFormatter.dateFormat = "MMMM dd, yyyy"
dateFormatter.locale = Locale(identifier: "en_US_POSIX")
let newDate = dateFormatter.string(from:originalDate)!
print(newDate)

But I get this error Cannot convert value of type 'String' to expected argument type 'Date'

How do I fix this?

vadian · Accepted Answer · 2020-01-02 16:03:14Z

2

You are trying to convert string(from: string which is not possible.

You have first to convert the string to date with the format yyyy-MM-dd and then change the format and convert it back to string.

let dateString = "2019-03-22"
let dateFormatter = DateFormatter()
dateFormatter.locale = Locale(identifier: "en_US_POSIX")
dateFormatter.dateFormat = "yyyy-MM-dd"
let date = dateFormatter.date(from: dateString)!
dateFormatter.dateFormat = "MMMM dd, yyyy"
let newDate = dateFormatter.string(from:date)
print(newDate)

edited Jan 2, 2020 at 16:03

answered Mar 24, 2019 at 5:27

vadian

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1 Comment

Richard Reis Over a year ago

Ahh I had to format it twice! Thank you this worked

Ratnesh Jain · Accepted Answer · 2019-03-24 05:30:33Z

1

You need to read the provided date string.

dateFormatter.dateFormat = "yyyy-MM-dd"

Now read the date string.

let aDate = dateFormatter.date(from: originalDate)

And then you provide the new format

dateFormatter.dateFormat = "MMMM dd, yyyy"
let newDateString = dateFormat.string(from: aDate)

Now the output is:

March 22, 2019

FullCode:

let originalDate = "2019-03-22"
let dateFormatter = DateFormatter()
dateFormatter.dateFormat = "yyyy-MM-dd"
dateFormatter.locale = Locale(identifier: "en_US_POSIX")
let aDate = dateFormatter.date(from: originalDate)!
dateFormatter.dateFormat = "MMMM dd, yyyy"
let newDate = dateFormatter.string(from: aDate)
print(newDate)

answered Mar 24, 2019 at 5:30

Ratnesh Jain

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Comments

Saurabh · Accepted Answer · 2019-03-24 08:57:58Z

0

I am already using the following method in my project :

func dateFormat(_ originalDate: String) -> String{
     let dateFormatter = DateFormatter()
     dateFormatter.dateFormat = "yyyy-MM-dd"
     dateFormatter.locale = Locale(identifier: "en_US_POSIX")
     let date = dateFormatter.date(from: originalDate)
     dateFormatter.dateFormat = "MMMM dd, yyyy"
     let valueDate = dateFormatter.string(from: date!)
     return valueDate
}

You can utilize the method like this :

dateFormat("2019-03-22") // March 22, 2019

edited Mar 24, 2019 at 8:57

answered Mar 24, 2019 at 7:04

Saurabh

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3 Comments

vadian Over a year ago

As originalDate is non-optional it cannot be nil. The check is pointless

vadian Over a year ago

Actually it’s exactly the same as my answer except it’s wrapped in a function and it declares two completely unnecessary variables.

Saurabh Over a year ago

Actually I have used this method in my code, so it becomes easy to use when wrapped in a function. Just need to pass the parameter while calling the function and it can be used anywhere in the project.

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