Unit converter

    public static void main(String[] args) {
        String t1 = "23:59";
        String t2 = "11:43";

        System.out.println(LocalTime.parse(t2).isAfter(LocalTime.parse(t1)));

        //SpringApplication.run(Application.class, args);
        Map<String, Double> rates = new HashMap<>();
        rates.put("mm", 0.001);
        rates.put("cm", 0.01);
        rates.put("km", 1000D);
        rates.put("mi", 1609.344);
        rates.put("yd", 0.9144);
        rates.put("ft", 0.3048);
        rates.put("m", 1D);
        rates.put("ly", 9_460_730_472_580_800.00);

        Scanner scanner = new Scanner(System.in);
        String metric1 = scanner.nextLine();
        String metric2 = scanner.nextLine();
        double value = Double.parseDouble(scanner.nextLine());

        value = value * rates.get(metric1);
        value = value / rates.get(metric2);

        System.out.println(value);
    }