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()
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