Java Data Type How to - Get the current date and time in UTC or GMT

Question

We would like to know how to get the current date and time in UTC or GMT.

Answer

import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Date;
import java.util.TimeZone;
//w ww  . j av  a  2s. com
public class Main {
    public static void main (String[] args){
        System.out.println(my_time_in("GMT-5:00", "MM/dd/yyyy HH:mm:ss") );
        System.out.println(my_time_in("GMT+5:30", "HH:mm a z 'on' MM/dd/yyyy"));

        System.out.println(my_time_in("America/Los_Angeles", "HH:mm a z 'on' MM/dd/yyyy") );
        System.out.println(my_time_in("America/Buenos_Aires", "HH:mm a z 'on' MM/dd/yyyy") );
    }

    public static String my_time_in(String target_time_zone, String format){
        TimeZone tz = TimeZone.getTimeZone(target_time_zone);
        Date date = Calendar.getInstance().getTime();
        SimpleDateFormat date_format_gmt = new SimpleDateFormat(format);
        date_format_gmt.setTimeZone(tz);
        return date_format_gmt.format(date);
    }
}

The code above generates the following result.