Java Get List of All Days Between Two LocalDateTime

Tags: Java LocalDateTime Java 8 DateUtil

In this Java tutorial, we learn how to write Java utility method to get the all days between two LocalDateTime values and return it a as a List of LocalDateTime objects in Java programming language.

How to get list of all days between two LocalDateTime objects

In this first step, we create a new Java class named DateUtil, and implement a static method named getAllLocalDateTimeBetween(LocalDateTime start, LocalDateTime end) to return a List of LocalDateTime contain the days between start and end as the following Java code.

DateUtil.java 

import java.time.LocalDate;
import java.time.LocalDateTime;
import java.util.ArrayList;
import java.util.List;

public class DateUtil {

    /**
     * Get list of all days between two LocalDateTime objects and return a List of LocalDateTime
     * @param start the start LocalDateTime value
     * @param end the end LocalDateTime value
     * @return the list of LocalDateTime of all days between start and end
     */
    public static List<LocalDateTime> getAllLocalDateTimeBetween(LocalDateTime start, LocalDateTime end) {
        List<LocalDateTime> result = new ArrayList<>();
        LocalDate startLocalDate = start.toLocalDate();
        LocalDate endLocalDate = end.toLocalDate();
        while(startLocalDate.isBefore(endLocalDate)) {
            result.add(startLocalDate.atStartOfDay());
            startLocalDate = startLocalDate.plusDays(1);
        }
        result.add(endLocalDate.atStartOfDay());

        return result;
    }
}

In the following example Java program, we show how to use the DateUtil above to get list of all days between two LocalDateTime from 1 August 2022 to 5 August 2022 and print out the result.

GetAllDaysBetweenLocalDateTimeExample.java 

import java.time.LocalDateTime;
import java.util.List;

public class GetAllDaysBetweenLocalDateTimeExample {
    public static void main(String... args) {
        LocalDateTime start = LocalDateTime.parse("2022-08-01T08:29:50.00");
        LocalDateTime end = LocalDateTime.parse("2022-08-05T13:30:40.00");

        // Get List of All Days Between Two LocalDateTime object
        List<LocalDateTime> listOfAllDays = DateUtil.getAllLocalDateTimeBetween(start, end);

        listOfAllDays.forEach(System.out::println);
    }
}
The output as below. 
2022-08-01T00:00
2022-08-02T00:00
2022-08-03T00:00
2022-08-04T00:00
2022-08-05T00:00

Happy Coding 😊

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