How Many Days Are Between Two Dates in Java Using the German Date Format?

Calculating Days Between Two Dates with Java

Challenge

Develop a Java program to calculate the number of days between two dates specified using the German notation "dd mm yyyy". The program should account for leap years and summer time.

Code

A comprehensive code that adheres to the specified requirements below:

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

public class DaysBetweenDates {

    public static void main(String[] args) {
        // Create a formatter for the German date format
        DateTimeFormatter formatter = DateTimeFormatter.ofPattern("dd MM yyyy");

        // Get the first and second dates from the user
        Scanner scanner = new Scanner(System.in);
        System.out.print("Enter the first date (dd MM yyyy): ");
        String firstDateInput = scanner.nextLine();
        System.out.print("Enter the second date (dd MM yyyy): ");
        String secondDateInput = scanner.nextLine();

        // Parse the dates into LocalDate objects
        LocalDate firstDate = LocalDate.parse(firstDateInput, formatter);
        LocalDate secondDate = LocalDate.parse(secondDateInput, formatter);

        // Calculate the number of days between the dates
        long daysBetween = ChronoUnit.DAYS.between(firstDate, secondDate);

        // Print the result
        System.out.println("Days between the dates: " + Math.abs(daysBetween));
    }
}

Explanation

• This code utilizes the java.time package, which offers classes for more modern and intuitive date handling in Java.
• We employ DateTimeFormatter to manage date input and output in the German format.
• Temporal units are used to compute the difference between the two dates in days using ChronoUnit.DAYS.between(firstDate, secondDate).
• We take the absolute difference of the computed days to ensure accuracy regardless of date order.

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