Sample code to properly format Sql timestamp in JSON from a web service.

iOSDateFormatter.swift

// Language: Swift 4
func getDayFromSqlTime(timeStamp: String) -> String {
        let dateFormatter = DateFormatter()
        
        /*
        This format is based on what is returned from the webservice. My webservice returns "2018-12-12 20:19:22".
        Every character has to be represented for this to work properly else Xcode would throw an error.
        For example if your webservice returns "2018-02-21T10:10:14", then valid format would be "yyyy-MM-dd'T'HH:mm:ss",
        if "2018-02-02 06:50:16 +0000", then format is "yyyy-MM-dd HH:mm:ss +zzzz".
        */
        dateFormatter.dateFormat = "yyyy-MM-dd HH:mm:ss"
        
        let displayDate1 = dateFormatter.date(from: timeStamp)
        
        /*
        This is the readable format I want displayed on my app. For example, this would return "03 Dec, 2018".
        */
        dateFormatter.dateFormat = "dd MMM, yyyy"
        
        let displayDate2 = dateFormatter.string(from: displayDate1!)
        return displayDate2
 }