Convert Local Time to GMT in Java

In this article, we will understand how to convert the local Time to GMT. Java does not have a built-in Date class, but we can import the java.time package to work with the date and time API. The package includes many date and time classes.

Below is a demonstration of the same −

Suppose our input is −

The local time is: Fri Mar 18 00:01:54 IST 2022

The desired output would be −

The time in Gmt is: 17/03/2022 18:31:54

Algorithm

Step 1 - START
Step 2 - Declare an object of LocalDateTime namely date.
Step 3 - Define the values.
Step 4 - Define different date time formats using DateTimeFormatter objects.
Step 5 - Display the GMT date time formats
Step 6 - Stop

Example 1

Here, we bind all the operations together under the ‘main’ function.

import java.text.DateFormat;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.TimeZone;
public class Demo {
   public static void main(String[] args){
      System.out.println("The required packages have been imported");
      Date localTime = new Date();
      System.out.println("A Date object is defined");
      DateFormat GMT_format = new SimpleDateFormat("dd/MM/yyyy" + " " + " HH:mm:ss");
      GMT_format.setTimeZone(TimeZone.getTimeZone("GMT"));
      System.out.println("\nThe local time is: " + localTime);
      System.out.println("The time in Gmt is: " + GMT_format.format(localTime));
   }
}

Output

The required packages have been imported
A Date object is defined

The local time is: Tue Mar 29 08:59:11 UTC 2022
The time in Gmt is: 29/03/2022 08:59:11

Example 2

Here, we encapsulate the operations into functions exhibiting object-oriented programming.

import java.text.DateFormat;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.TimeZone;
public class Demo {
   static void GMT_time(Date localTime){
      DateFormat GMT_format = new SimpleDateFormat("dd/MM/yyyy" + " " + " HH:mm:ss");
      GMT_format.setTimeZone(TimeZone.getTimeZone("GMT"));
      System.out.println("\nThe local time is: " + localTime);
      System.out.println("The time in Gmt is: " + GMT_format.format(localTime));
   }
   public static void main(String[] args){
      System.out.println("The required packages have been imported");
      Date localTime = new Date();
      System.out.println("A Date object is defined");
      GMT_time(localTime);
   }
}

Output

The required packages have been imported
A Date object is defined

The local time is: Tue Mar 29 08:59:38 UTC 2022
The time in Gmt is: 29/03/2022 08:59:38