Java TimeZone Class

Java TimeZone class represents a time zone offset, and also figures out daylight savings. It inherits the Object class.

Java TimeZone class declaration

Let's see the declaration of java.util.TimeZone class.

public abstract class TimeZone extends Object  implements Serializable, Cloneable

Methods of Java TimeZone

Method	Description
static String[] getAvailableIDs()	It is used to get all the available IDs supported.
static TimeZone getDefault()	It is used to get the default TimeZone for this host.
String getDisplayName()	It is used to return a name of this time zone suitable for presentation to the user in the default locale.
String getID()	It is used to get the ID of this time zone
int getOffset(long date)	It is used to return the offset of this time zone from UTC at the specified date.
void setID(String ID)	It is used to set the time zone ID

Java TimeZone class Example: getAvailableIDs()

FileName: TimeZoneExample1.java

import java.util.*;
public class TimeZoneExample1 {
   public static void main( String args[] ){       
   String[] id = TimeZone.getAvailableIDs();      
   System.out.println("In TimeZone class available Ids are: ");
   for (int i=0; i<id.length; i++){
   System.out.println(id[i]);
   } 
   }    
}

Test it Now

Output:

In TimeZone class available Ids are: 
Africa/Abidjan
Africa/Accra
Africa/Addis_Ababa
Africa/Algiers
Africa/Asmara
Africa/Asmera
Africa/Bamako
Africa/Bangui
Africa/Banjul
Africa/Bissau and so on ....

Java TimeZone class Example: getOffset()

FileName: TimeZoneExample2.java

import java.util.*;
public class TimeZoneExample2 {
   public static void main( String args[] ){    
   TimeZone zone = TimeZone.getTimeZone("Asia/Kolkata"); 
   System.out.println("The Offset value of TimeZone: " + 
   zone.getOffset(Calendar.ZONE_OFFSET));
   }    
}

Test it Now

Output:

The Offset value of TimeZone: 19800000

Java TimeZone class Example: getID()

FileName: TimeZoneExample3.java

import java.util.*;
public class TimeZoneExample3 {
   public static void main( String args[] ){
   TimeZone timezone = TimeZone.getTimeZone("Asia/Kolkata");     
   System.out.println("Value of ID is: " + timezone.getID());
   }    
}

Test it Now

Output:

Value of ID is: Asia/Kolkata

Java TimeZone class Example: getDisplayName()

FileName: TimeZoneExample4.java

import java.util.*;
public class TimeZoneExample4 {
   public static void main( String args[] ){
   TimeZone zone = TimeZone.getDefault();
   String name = zone.getDisplayName();       
   System.out.println("Display name for default time zone: "+ name);
   }    
}

Test it Now

Output:

Display name for default time zone: India Standard Time

Java TimeZone class Example: getDefault()

Let's see the working of the getDefault() method.

FileName: GetDefaultExample.java

// important import statement
import java.util.*;

public class GetDefaultExample
{
// main method
public static void main(String[] argvs)
{
// invoking the getDefault() Method
TimeZone zone = TimeZone.getDefault();   
System.out.println("The ID of the default TimeZone is: " + zone.getID());  
 
}
}

Output:

The ID of the default TimeZone is: GMT

Java TimeZone class Example: setID()

Let's see the working of the setID() method.

FileName: SetIDExample.java

// important import statement
import java.util.*;

public class SetIDExample 
{
   
// main method
public static void main( String argvs[] ) 
{

// creating an object of the class TimeZone 
TimeZone tz = TimeZone.getDefault();

// setting the time zone ID
tz.setID("GMT + 07:01");

// checking for the time zone ID
System.out.println("The Time zone ID is: " + tz.getID());
}    
}

Output:

The Time zone ID is: GMT + 07:01

Next TopicJava DateFormat

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