How to change Time Zone in Java?

Problem Description :

Write a program in Java that changes Time Zone of current date .

This problem can also be asked as following.

Write a program in Java that changes Time Zone of given date

Here first we have to convert String to Date and remaining program will be same as below.

Change time zone in Java

Concept :

For changing time zone of date we have to use below method of DateFormat class that is present in java.text.* package.

void setTimeZone(TimeZone timezone)

Here we are changing date in IST to GMT and EST.

Java Program :

package com.javamultiplex.datetime; import java.text.DateFormat; import java.text.ParseException; import java.text.SimpleDateFormat; import java.util.Date; import java.util.TimeZone; /** * * @author Rohit Agarwal * @category Date and Time * @problem How to change Time Zone? * */ public class ChangeTimezone { public static void main(String[] args) throws ParseException { // Get Current date. Date date = new Date(); // Get default Time zone. TimeZone timezone = TimeZone.getDefault(); System.out.println("Time Zone : " + timezone.getID() + " | " + timezone.getDisplayName()); /* * d -> Day of month * M -> Month of year * Y -> Year * h -> Hour (1-12) * m -> minute * s -> second * a -> AM/PM * z -> Time zone */ DateFormat format = new SimpleDateFormat("dd/MM/yyyy hh:mm:ss a z"); // Converting Date to String. String dateInString = format.format(date); System.out.println("Current date in IST : " + dateInString); // Getting London time zone. timezone = TimeZone.getTimeZone("Europe/London"); System.out.println("Time Zone : " + timezone.getID() + " | " + timezone.getDisplayName()); // Setting London time zone. format.setTimeZone(timezone); // Converting Date to String. dateInString = format.format(date); System.out.println("Current date in GMT : " + dateInString); // Getting Newyork time zone. timezone = TimeZone.getTimeZone("America/New_York"); System.out.println("Time Zone : " + timezone.getID() + " | " + timezone.getDisplayName()); // Setting Newyork time zone. format.setTimeZone(timezone); // Converting Date to String. dateInString = format.format(date); System.out.println("Current date in EST : " + dateInString); } }

Output :

Output - How to change time zone in Java?

References :

http://docs.oracle.com/javase/7/docs/api/java/text/DateFormat.html#setTimeZone(java.util.TimeZone)

https://docs.oracle.com/javase/7/docs/api/java/text/SimpleDateFormat.html

Thank you friends, I hope you have clearly understood the solution of this problem. If you have any doubt, suggestion or query please feel free to comment below. You can also discuss this solution in our forum.

Tags : Date and Time problems, Change Timezone in Java, String, DateFormat, SimpleDateFormat.

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How to change Time Zone in Java?

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