How to format a Date from String in Swift 4

Question

I have a "createdAt" date string that I want to format like EEEE, MMM d, yyyy in Swift 4.

var createdAt:String = ""

And a function that formats a date

func getFormattedDate(date: Date, format: String) -> String {
    let dateformat = DateFormatter()
    dateformat.dateFormat = format
    return dateformat.string(from: date)
}

I can use this function to correctly format todays date like so:

let formatingDate = getFormattedDate(date: Date(), format: "EEEE, MMM d, yyyy")
Text(formatingDate)

But how do I make it so it correctly formats my "createdAt" string not just todays date?

convert your createdAt string to date firstly and pass it to your getFormattedDate — Alexandr Kolesnik, Jan 02 '20 at 15:50
What is the source for createdAt, what type of value do you get that you want to assign to createdAt? — Joakim Danielson, Jan 02 '20 at 15:52
You cannot format a empty string to any date. Please add the source format. — vadian, Jan 02 '20 at 15:55

Shehata Gamal · Answer 1 · 2020-01-02T16:12:56.643

0

You need

func getFormattedDate(str:String, format: String) -> String { 
    let dateformat = DateFormatter()
    dateformat.locale = Locale(identifier: "en_US_POSIX") 
    dateformat.dateFormat = "createAtForm"
    let dInpu = dateformat.date(from: str)!
    dateformat.dateFormat = format
    return dateformat.string(from:dInpu)
}

let formatingStr = getFormattedDate(str: createdAt, format: "EEEE, MMM d, yyyy")

edited Jan 02 '20 at 16:12

answered Jan 02 '20 at 15:52

Shehata Gamal

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what is dInpu ? – Jawad Ali Jan 02 '20 at 16:00
date of createdAt – Shehata Gamal Jan 02 '20 at 16:00
good answer sir – Jawad Ali Jan 02 '20 at 16:01
Thanks for the speedy answer! Is this how I use it? let formatingDate = getFormattedDate(str: createdAt, format: "EEEE, MMM d, yyyy") Text(formatingDate) Value of optional type 'Date?' must be unwrapped to a value of type 'Date' – Tom Wicks Jan 02 '20 at 16:08
ok re-copy answer and change `createAtForm` to the format of the created at string – Shehata Gamal Jan 02 '20 at 16:10
Just tried that but get this error: Cannot use instance member 'createdAt' within property initializer; property initializers run before 'self' is available – Tom Wicks Jan 02 '20 at 16:11

How to format a Date from String in Swift 4

1 Answers1