HIHIHI

 /**
     * STAČÍ POUŽÍT GOOGLE, ZMRDI
     * S LÁSKOU, FRANTIŠEK <3
     */
    public static void main(String[] args) {
        int enteredDay, enteredMonth, enteredYear, dayOfYear;

        System.out.println("Zadejte den:");
        Scanner scanner = new Scanner(System.in);
        enteredDay = scanner.nextInt();

        System.out.println("Zadejte mesic:");
        Scanner newScanner = new Scanner(System.in);
        enteredMonth = newScanner.nextInt();

        System.out.println("Zadejte rok:");
        Scanner yearScanner = new Scanner(System.in);
        enteredYear = yearScanner.nextInt();

        LocalDate localDate = LocalDate.of(enteredYear, enteredMonth, enteredDay);
        DateTimeFormatter formatter = DateTimeFormatter.ofPattern("dd-MM-yyyy");
        formatter.format(localDate);

        dayOfYear = localDate.getDayOfYear();

        System.out.println("Den v roce je: " + dayOfYear);
    }