How do I use java.time.ZoneId class?

java.time.ZoneId is a class in Java’s Date-Time API used to represent a time zone identifier. This identifier is used to get a ZoneRules, which then can be used to convert between an Instant and a LocalDateTime.

Here is how you can use the ZoneId class in a simple way:

package org.kodejava.datetime;

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

public class ZoneIdExample {
    public static void main(String[] args) {
        // Get the system default ZoneId
        ZoneId defaultZoneId = ZoneId.systemDefault();
        System.out.println("System Default TimeZone : " + defaultZoneId);

        // Get ZoneId instance using the specified zone ID as a string
        ZoneId londonZoneId = ZoneId.of("Europe/London");
        System.out.println("London ZoneId : " + londonZoneId);

        // Get ZonedDateTime using ZoneId
        ZonedDateTime zonedDateTimeInLondon = ZonedDateTime.now(londonZoneId);
        System.out.println("Current date and time in London: " + zonedDateTimeInLondon);
    }
}

Output:

System Default TimeZone : Asia/Makassar
London ZoneId : Europe/London
Current date and time in London: 2024-01-19T06:43:23.076855Z[Europe/London]

In the above code:

ZoneId.systemDefault() is used to get the system default ZoneId.
ZoneId.of(String zoneId) is used to get a ZoneId instance using the specified zone ID as a string. You can get all available zone IDs by calling ZoneId.getAvailableZoneIds().
ZonedDateTime.now(ZoneId zoneId) is used to get the current date and time in the specified time zone.

Please note that the ZoneId is immutable and thread-safe, it ensures the class can be used safely in multithreaded systems.

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Wayan

Founder at Kode Java Org

A programmer, runner and recreational diver, lives on the island of Bali, Indonesia. Programming in Java, Spring, Hibernate / JPA. You can support me working on this project, buy me a cup of coffee ☕, every little bit helps. Thank you 🙏

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