DateFormatter returning string with incorrect language

func portugueseFormattedEn_US -> String {
        Formatter.date.calendar = Calendar(identifier: .iso8601)
        Formatter.date.locale   = Locale(identifier: “pt-PT”)
        Formatter.date.timeZone = .current
        Formatter.date.dateFormat = "dd/M/yyyy, H:mm"
        return Formatter.date.string(from: self)
    }

in "Locale(identntfier: “pt-PT”)" you have to pass exact identifier which you want and need to set language as well.

As I Understand your question. You want to change the date format with the current device language.

Set Locale as your preferred language

let formatter = DateFormatter()
formatter.timeZone = TimeZone.current
formatter.locale = Locale.init(identifier: Locale.preferredLanguages.first!)
formatter.setLocalizedDateFormatFromTemplate("ddMMMMyyyy HH:mm")
let stringDate = formatter.string(from: Date())

print(stringDate)

Output:- Show date with current device language.

08 de março de 2019 10:54