Current time GMT offset

The problem

Write a program that displays the current time in GMT. Prompt the user to enter the time zone offset to GMT and displays the time in the specified time zone. Here is a examples run:

Enter the time zone offset to GMT: -5
The current time is 4:50:34

Breaking it down

private final static String DATE_FORMAT = "EEE, dd MMM yyyy HH:mm:ss z";

public static void main(String[] Strings) {

    Scanner input = new Scanner(System.in);

    System.out.print("Enter the time zone offset to GMT: ");

    int timeZoneChange = input.nextInt();

    input.close();

    String timeZoneAdjustment = timeZoneChange > 0 ? "+" : "-";

    final SimpleDateFormat sdf = new SimpleDateFormat(DATE_FORMAT);
    sdf.setTimeZone(TimeZone.getTimeZone("GMT" + timeZoneAdjustment
            - String.valueOf(timeZoneChange)));
    String dateTimeString = sdf.format(new Date());

    System.out.println("Current date time is " + dateTimeString);
}

Output

Enter the time zone offset to GMT: 0
Current date time is Tue, 05 Apr 2016 02:05:29 GMT-00:00

Enter the time zone offset to GMT: 3
Current date time is Tue, 05 Apr 2016 05:05:51 GMT+03:00