Java Convert LocalDate to ZonedDateTime

Tags: Java LocalDate Java ZonedDateTime Java 8

In Java ZonedDateTime is a date-time data type with a time-zone in the ISO-8601 calendar system, such as 2022-07-11T10:15:30+01:00 Europe/Paris. In this Java core tutorial we learn how to convert a java.time.LocalDate object to a java.time.ZondedDateTime object in Java programming language.

How to convert LocalDate to ZonedDateTime

In Java with a given LocalDate object we can use LocalDate.atStartOfDay() method with a specified ZoneId to convert LocalDate to ZonedDateTime.

In the following Java program we convert a LocalDate to ZonedDateTime with the default system time zone.

ConvertLocalDateToZonedDateTimeExample1.java 

import java.time.LocalDate;
import java.time.ZoneId;
import java.time.ZonedDateTime;

public class ConvertLocalDateToZonedDateTimeExample1 {
    public static void main(String... args) {
        LocalDate localDate = LocalDate.of(2022, 7, 11);

        ZoneId zoneId = ZoneId.systemDefault();
        ZonedDateTime zonedDateTime = localDate.atStartOfDay(zoneId);

        System.out.println("LocalDate: " + localDate);
        System.out.println("ZonedDateTime: " + zonedDateTime);
    }
}
The output as below. 
LocalDate: 2022-07-11
ZonedDateTime: 2022-07-11T00:00+07:00[Asia/Bangkok]

We can convert LocalDate to ZonedDateTime at a specified time zone, using the ZoneId.of() method to get instance of ZoneId as the following Java program.

ConvertLocalDateToZonedDateTimeExample2.java 

import java.time.LocalDate;
import java.time.ZoneId;
import java.time.ZonedDateTime;

public class ConvertLocalDateToZonedDateTimeExample2 {
    public static void main(String... args) {
        LocalDate localDate = LocalDate.of(2022, 7, 11);

        ZoneId sydneyZoneId = ZoneId.of("Australia/Sydney");
        ZonedDateTime zonedDateTime = localDate.atStartOfDay(sydneyZoneId);

        System.out.println("LocalDate: " + localDate);
        System.out.println("ZonedDateTime: " + zonedDateTime);
    }
}
The output as below. 
LocalDate: 2022-07-11
ZonedDateTime: 2022-07-11T00:00+10:00[Australia/Sydney]

Happy Coding 😊

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