ZoneId systemDefault() method in Java with Examples

The systemDefault() method of the ZoneId class in Java is used to return the system default time-zone.

Syntax:

public String systemDefault()

Parameters: This method does not accepts any parameters.

Return Value: This method returns the zone ID.

Exceptions: This method throws following exception:

  • DateTimeException – It throws this exception if the converted zone ID has an invalid format.
  • ZoneRulesException – It throws this exception if the converted zone region ID cannot be found.

Below programs illustrate the systemDefault() method:
Program 1:

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// Java program to demonstrate
// ZoneId.systemDefault() method
  
import java.time.*;
  
public class GFG {
    public static void main(String[] args)
    {
  
        // create ZoneId object
        ZoneId zoneId
            = ZoneId.systemDefault();
  
        // printresult
        System.out.println("ZoneId: "
                           + zoneId);
    }
}

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Output:

ZoneId: Etc/UTC

Program 2:

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// Java program to demonstrate
// ZoneId.systemDefault() method
  
import java.time.*;
  
public class GFG {
    public static void main(String[] args)
    {
  
        // create ZoneId object
        ZoneId zoneId
            = ZoneId.systemDefault();
  
        if (zoneId.getId().equals("Etc/UTC"))
            System.out.println("This zone is Etc/UTC");
        else
            System.out.println("This zone is not Etc/UTC");
    }
}

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Output:

This zone is Etc/UTC

References:
https://docs.oracle.com/javase/10/docs/api/java/time/ZoneId.html#systemDefault()



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