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GregorianCalendar setTimeZone() Method in Java

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The java.util.GregorianCalendar.setTimeZone() method is an in-built method in Java which modifies the current time zone to a new time zone according to the parameter passed. Syntax:
public void setTimeZone(TimeZone tz)
Parameters: The method takes one parameter tz of TimeZone object which specifies the new time zone value. Return Values: This method does not return any value. Examples:
Input : IST
Output : India Standard Time

Input : UTC
Output : Coordinated Universal Time
Below programs illustrate the java.util.GregorianCalendar.setTimeZone() function in Java: Program 1:
// Java Program to  illustrate 
// GregorianCalendar.setTimeZone()
// function 
  
import java.io.*;
import java.util.*;
  
class GFG {
     public static void main(String[] args) {
      
      // Create a new calendar
      GregorianCalendar cal = (GregorianCalendar) 
                    GregorianCalendar.getInstance();
  
      // Display the current date and time
      System.out.println("" + cal.getTime());
        
      System.out.println("Current Time Zone : "
                    cal.getTimeZone().getDisplayName());
        
      // Convert to another time zone
      cal.setTimeZone(TimeZone.getTimeZone("CST"));
      System.out.println("New Time Zone : "
                    cal.getTimeZone().getDisplayName());
   }
}

                    
Output:
Wed Jul 25 11:11:14 UTC 2018
Current Time Zone : Coordinated Universal Time
New Time Zone : Central Standard Time
Program 2:
// Java Program to  illustrate 
// GregorianCalendar.setTimeZone()
// function 
  
import java.io.*;
import java.util.*;
  
class GFG {
     public static void main(String[] args) {
      
      // Create a new calendar
      GregorianCalendar cal = (GregorianCalendar) 
                    GregorianCalendar.getInstance();
  
      // Display the current date and time
      System.out.println("" + cal.getTime());
        
      System.out.println("Current Time Zone : "
                    cal.getTimeZone().getDisplayName());
        
      // Convert to another time zone
      cal.setTimeZone(TimeZone.getTimeZone("IST"));
      System.out.println("New Time Zone : "
                    cal.getTimeZone().getDisplayName());
   }
}

                    
Output:
Wed Jul 25 11:11:21 UTC 2018
Current Time Zone : Coordinated Universal Time
New Time Zone : India Standard Time
Reference: https://docs.oracle.com/javase/7/docs/api/java/util/GregorianCalendar.html#setTimeZone()

Last Updated : 25 Jul, 2018
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