Java Get List of All Days Between Two ZonedDateTime

Tags: Java ZonedDateTime Java 8 DateUtil

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

How to get all days between two ZonedDateTime objects

At this step, create a new Java class named DateUtil, and implement a static method named getAllDaysBetween(ZonedDateTime start, ZonedDateTime end) which return a List of ZonedDateTime values of all days between start and end as the following Java code.

DateUtil.java 

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

public class DateUtil {

    /**
     * Get list of all days between two ZonedDateTime values and return it as list of ZonedDateTime
     * @param start the start ZonedDateTime object
     * @param end the end ZonedDateTime object
     * @return the list of all ZonedDateTime objects between start and end
     */
    public static List<ZonedDateTime> getAllDaysBetween(ZonedDateTime start, ZonedDateTime end) {
        List<ZonedDateTime> result = new ArrayList<>();
        LocalDate startLocalDate = start.toLocalDate();
        LocalDate endLocalDate = end.toLocalDate();
        while(startLocalDate.isBefore(endLocalDate)) {
            result.add(ZonedDateTime.of(startLocalDate, LocalTime.MIDNIGHT, start.getZone()));
            startLocalDate = startLocalDate.plusDays(1);
        }
        result.add(ZonedDateTime.of(startLocalDate, LocalTime.MIDNIGHT, start.getZone()));

        return result;
    }
}

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

GetAllDaysBetweenZonedDateTimeExample.java 

import java.time.ZonedDateTime;
import java.util.List;

public class GetAllDaysBetweenZonedDateTimeExample {
    public static void main(String... args) {
        ZonedDateTime start = ZonedDateTime.parse("2022-08-01T08:15:30+02:00[Europe/Paris]");
        ZonedDateTime end = ZonedDateTime.parse("2022-08-10T19:20:30+02:00[Europe/Paris]");

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

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

Happy Coding 😊

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