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.

Recommended :

How to convert String to Date ?

How to convert Date to String ?

How to get Time Zone information ?

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);
	}
	}

view raw ChangeTimezone.java hosted with ❤ by GitHub

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

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

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