Java Convert Calendar to Another Time Zone

Tags: Java Calendar Java TimeZone SimpleDateFormat

In this Java tutorial, we learn step by step how to convert a Calendar object to a date time String in another time zone in Java program.

How to convert Calendar to another time zone in Java

With a given Calendar object in Java, we can convert it to a date time String in another time zone with the following steps.

  • Step 1: initialize java.text.SimpleDateFormat object with specified date time format.
  • Step 2: create new instance of java.util.TimeZone with the target time zone ID using the TimeZone.getTimeZone() method
  • Step 3: assign the TimeZone value to SimpleDateFormat object using the SimpleDateFormat.setTimeZone() method.
  • Step 4: use the SimpleDateFormat.format() method to format the Calendar’s date time to target time zone.
SimpleDateFormat simpleDateFormat = new SimpleDateFormat("dd-M-yyyy HH:mm:ss");
TimeZone timeZone = TimeZone.getTimeZone("Australia/Sydney");
simpleDateFormat.setTimeZone(timeZone);
String result = simpleDateFormat.format(calendar.getTime())

In the following example Java program, we learn how to convert a Calendar value from default system time zone to date time in Australia/Sydney time zone.

CalendarTimeZoneExample1.java 

import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.TimeZone;

public class CalendarTimeZoneExample1 {
    public static void main(String... args) {
        Calendar calendar = Calendar.getInstance();

        // Convert Calendar object to another time zone
        SimpleDateFormat simpleDateFormat = new SimpleDateFormat("dd-M-yyyy HH:mm:ss");
        TimeZone timeZone = TimeZone.getTimeZone("Australia/Sydney");
        simpleDateFormat.setTimeZone(timeZone);
        String result = simpleDateFormat.format(calendar.getTime());

        System.out.println("Current time zone: " + calendar.getTimeZone().getID());
        System.out.println("Date time in current time zone: " + calendar.getTime());
        System.out.println("Date time in Australia/Sydney time zone: " + result);

    }
}
The output as below. 
Current time zone: Asia/Bangkok
Date time in current time zone: Tue Oct 18 22:31:50 ICT 2022
Date time in Australia/Sydney time zone: 19-10-2022 02:31:50

Happy Coding 😊

Java Convert Date to Another Time Zone