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

Question

I tired to covert from 21/07/2016 to 2016-07-21 but got this date 2015-12-20
Here is the Code that i have try

let inputFormatter = NSDateFormatter()
inputFormatter.dateFormat = "MM/dd/YYYY"

let outputFormatter = NSDateFormatter()
outputFormatter.dateFormat = "YYYY-MM-dd"

let showDate = inputFormatter.dateFromString("07/21/2016")
let resultString = outputFormatter.stringFromDate(showDate!)

print(resultString)

How to convert?
Thank you

Nirav D · Accepted Answer · 2022-01-06T11:12:40.957

81

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)

edited Jan 06 '22 at 11:12

answered Jul 21 '16 at 11:50

Nirav D

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@Nirav D hey what if i want to convert the datepicker's date to 'yyyy-MM-dd' ? – deltami Jan 08 '18 at 09:33
@deltami Then set that format with DateFormatter and after that pass date picker date in `string(from:)` method of DateFormatter – Nirav D Jan 09 '18 at 04:43
what is the purpose of z" – Muhammad Shauket Jan 04 '22 at 05:37
@MuhammadShauket z is used for timezone but in question there is no time zone so I have corrected the edit of user IOSSingh – Nirav D Jan 06 '22 at 11:15

score 17 · Answer 2 · answered Jul 21 '16 at 12:13

You can define a function like the one below:

// input string should always be in format "21/07/2016" ("dd/MM/yyyy")

func formattedDateFromString(dateString: String, withFormat format: String) -> String? {

    let inputFormatter = NSDateFormatter()
    inputFormatter.dateFormat = "dd/MM/yyyy"

    if let date = inputFormatter.dateFromString(dateString) {

      let outputFormatter = NSDateFormatter()
      outputFormatter.dateFormat = format

      return outputFormatter.stringFromDate(date)
    }

    return nil
}

You can use the above to pass an output format for your date string. Input format will always be dd/MM/yyyy. Then you use it as follows:

let stringA = formattedDateFromString("21/07/2016", withFormat: "yyyy-MM-dd")
let stringB = formattedDateFromString("21/07/2016", withFormat: "MMM dd, yyyy")

NSLog("stringA: \(stringA)") // 2016-07-21
NSLog("stringB: \(stringB)") // Jul 21, 2016

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

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