func toIslamic() -> String {
    let dateFormatter: DateFormatter = DateFormatter()

    dateFormatter.dateFormat = "dd/MM/yyyy"
    dateFormatter.locale = Locale(identifier: "en")
    let GregorianDate = dateFormatter.date(from: "23/03/1992")
    let islamic = Calendar(identifier: Calendar.Identifier.islamicUmmAlQura)
    let components = (islamic as NSCalendar?)?.components(NSCalendar.Unit(rawValue: UInt.max), from: GregorianDate!)
    let fina_date = "(components!.day!)/(components!.month!)/(components!.year!)"
    print("final Islamic Date :: (fina_date)") // 18/9/1412
    return fina_date

}

print("final Islamic Date :: (fina_date)") // 18/9/1412

20/9/1412