Format a date from a string

Question

I\'m trying to format a date from a string into another format.

For example: 2012-05-29 23:55:52 into 29/05 *newline* 2010.

I just

Answer 1

JFrank answer is good. But Apple says:

"Cache Formatters for Efficiency" (https://developer.apple.com/library/archive/documentation/Cocoa/Conceptual/DataFormatting/Articles/dfDateFormatting10_4.html) to void allocating and discarding. So, as statics are already lazy...

(For clarity I show only generating a date.. output format is similar..)

import Foundation


extension Date{


    // Global constants and variables are always computed lazily:
    static private var yyyyMMdd_dateFormatter : DateFormatter  {
        let df = DateFormatter()
        df.dateFormat = "yyyyMMdd"
        return df
    }


    init?(YYYYMMDDString: String?){

        guard let dateString = YYYYMMDDString else {return nil}

        guard let date = Self.yyyyMMdd_dateFormatter.date(from: dateString) else {
            return nil
        }
            self = date

     }


}