Java Get List of All Days Between Two OffsetDateTime

Tags: Java OffsetDateTime Java 8 DateUtil

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

How to get list of all days between two OffsetDateTime objects

Firstly, create a new Java class named DateUtil, and implement a static method getAllDaysBetween(OffsetDateTime start, OffsetDateTime end) which return a List of OffsetDateTime for all days between start and end.

DateUtil.java 

import java.time.LocalDate;
import java.time.LocalTime;
import java.time.OffsetDateTime;
import java.util.ArrayList;
import java.util.List;

public class DateUtil {

    /**
     * The method to get all days between two OffsetDateTime values and return as a List of OffsetDateTime
     * @param start the start OffsetDateTime object
     * @param end the end OffsetDateTime object
     * @return the list of all OffsetDateTime between start and end
     */
    public static List<OffsetDateTime> getAllDaysBetween(OffsetDateTime start, OffsetDateTime end) {
        List<OffsetDateTime> result = new ArrayList<>();
        LocalDate startLocalDate = start.toLocalDate();
        LocalDate endLocalDate = end.toLocalDate();
        while(startLocalDate.isBefore(endLocalDate)) {
            result.add(OffsetDateTime.of(startLocalDate, LocalTime.MIDNIGHT, start.getOffset()));
            startLocalDate = startLocalDate.plusDays(1);
        }

        result.add(OffsetDateTime.of(startLocalDate, LocalTime.MIDNIGHT, start.getOffset()));
        return result;
    }
}

In the following Java program, we show how to use the above DateUtil class to get list of all days between two OffsetDateTime 1 August 2022 to 10 August 2022 and print out the result.

GetAllDaysBetweenOffsetDateTimeExample.java 

import java.time.OffsetDateTime;
import java.util.List;

public class GetAllDaysBetweenOffsetDateTimeExample {
    public static void main(String... args) {
        OffsetDateTime start = OffsetDateTime.parse("2022-08-01T07:50:00.00+07:00");
        OffsetDateTime end = OffsetDateTime.parse("2022-08-10T16:50:00.00+07:00");

        // Get List of All Days Between Two OffsetDateTime objects
        List<OffsetDateTime> allDaysBetween = DateUtil.getAllDaysBetween(start, end);

        allDaysBetween.forEach(System.out::println);
    }
}
The output as below. 
2022-08-01T00:00+07:00
2022-08-02T00:00+07:00
2022-08-03T00:00+07:00
2022-08-04T00:00+07:00
2022-08-05T00:00+07:00
2022-08-06T00:00+07:00
2022-08-07T00:00+07:00
2022-08-08T00:00+07:00
2022-08-09T00:00+07:00
2022-08-10T00:00+07:00

Happy Coding 😊

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