Java ZoneId

The Java ZoneId abstract class is used to distinguish the rules used to convert between an Instant and LocalDateTime.

How to use

The class ZoneId represents a time-zone ID, such as Asia/Calcutta or Asia/Tokyo. Try the following examples to better understand –

System default example

The following example program shows how you can use the ZoneId class to get the system default zone.

ZoneIdExample1 .javaCopy
import java.time.ZoneId;

public class ZoneIdExample1 {

    public static void main(String[] args) {

        // Get system default zone id
        ZoneId zoneId = ZoneId.systemDefault();
        System.out.println(zoneId);
    }
}
Try It

Display name example

The following example program shows how you can use getDisplayName() function to get the display name of a zone.

ZoneIdExample2.javaCopy
import java.time.ZoneId;
import java.time.format.TextStyle;
import java.util.Locale;

public class ZoneIdExample2 {

    public static void main(String[] args) {

        // Get system default zone id
        ZoneId zoneId = ZoneId.of("Asia/Calcutta");

        // Get display name
        String displayName = zoneId.getDisplayName(TextStyle.FULL, Locale.ENGLISH);

        System.out.println(displayName);
    }
}
Try It

Time of different zone example

The following example program shows how you can use ZoneId class with LocalTime class to get the time of different zones.

ZoneIdExample3.javaCopy
import java.time.LocalTime;
import java.time.ZoneId;

public class ZoneIdExample3 {

    public static void main(String[] args) {

        // Get system default zone id
        ZoneId zoneIdCalcutta = ZoneId.of("Asia/Calcutta");
        ZoneId zoneIdTokyo = ZoneId.of("Asia/Tokyo");

        LocalTime localTimeCalcutta = LocalTime.now(zoneIdCalcutta);
        LocalTime localTimeTokyo = LocalTime.now(zoneIdTokyo);

        // Print time at Asia/Calcutta;
        System.out.println(localTimeCalcutta);
        
        // Print time at Asia/Tokyo
        System.out.println(localTimeTokyo);
    }
}
Try It