Days between Two Dates (using LocalDate)

/* Write a program to calculate the difference between two dates in number of days.
 * The dates are entered at two consecutive lines in format day-month-year.
 * Days are in range [1…31]. Months are in range [1…12].
 * Years are in range [1900…2100]. */

import java.time.LocalDate;
import java.time.format.DateTimeFormatter;
import java.util.Scanner;

public class _07_DaysBetweenTwoDates_Using_LocalDate {

    public static void main(String[] args) {
        // TODO Auto-generated method stub
        Scanner scan = new Scanner(System.in);
        System.out.println("Enter 2 dates exactly in this format [day-month-year]: ");
        String firstInputStr = scan.next();
        String secondInputStr = scan.next();

        LocalDate startDate = convertSpecificInputDateStringToLocalDate(firstInputStr);
        LocalDate endDate = convertSpecificInputDateStringToLocalDate(secondInputStr);

        long resultDays = 0;
        if (!endDate.equals(startDate)) {
            boolean resultIsNegative = endDate.isBefore(startDate);
            int startYear = startDate.getYear();
            int startDayOfYear = startDate.getDayOfYear();
            int endYear = endDate.getYear();
            int endDayOfYear = endDate.getDayOfYear();
            int yearsBetweenDates = getYearsBetweenTwoDates(resultIsNegative,
                    startYear, startDayOfYear, endYear, endDayOfYear);

            double daysBetweenDates = yearsBetweenDates * 365.2425;
            int differenceDayOfYear = getDifferenceFromDayOfYearComponent(
                    resultIsNegative, startDayOfYear, endDayOfYear);

            resultDays = Math.round(daysBetweenDates + differenceDayOfYear);

        }
        System.out.printf("The number of Days between these 2 dates is: %d !\n",
                resultDays);
    }

    private static int getDifferenceFromDayOfYearComponent(
            boolean resultIsNegative, int startDayOfYear, int endDayOfYear) {
        int differenceDayOfYear = 0;
        if (endDayOfYear != startDayOfYear) {
            differenceDayOfYear = endDayOfYear - startDayOfYear;
            if (resultIsNegative && endDayOfYear > startDayOfYear) {
                differenceDayOfYear -= 365;
            } else if (!resultIsNegative && endDayOfYear < startDayOfYear) {
                differenceDayOfYear += 365;
            }
        }
        return differenceDayOfYear;
    }

    private static int getYearsBetweenTwoDates(boolean resultIsNegative,
            int startYear, int startDayOfYear, int endYear, int endDayOfYear) {
        int yearsBetweenDates = 0;
        if (endYear != startYear) {
            yearsBetweenDates = endYear - startYear;
            if (resultIsNegative && endDayOfYear > startDayOfYear) {
                yearsBetweenDates += 1;
            } else if (!resultIsNegative && endDayOfYear < startDayOfYear) {
                yearsBetweenDates -= 1;
            }
        }
        return yearsBetweenDates;
    }

    private static LocalDate convertSpecificInputDateStringToLocalDate(String inputStr) {
        // TODO Auto-generated method stub
        DateTimeFormatter dateFormat = DateTimeFormatter.ofPattern("d-MM-yyyy");
        return LocalDate.parse(inputStr, dateFormat);
    }

}