import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Date;
import java.util.TimeZone;

public class GetUTCTime {

    public static void main(String[] args) throws ParseException {
        
        String pattern_ori = "yyyy-MM-dd‘T‘HH:mm:ss.SSSZ";
        SimpleDateFormat format 
 
= new SimpleDateFormat(pattern_ori);
       
        Date now=new Date();
        
        System.out.println("LOC:"+format.format(now));
        System.out.println("UTC:"+getUTC(now,format));
        
    }
    
    private static String getUTC(Date date,SimpleDateFormat format) throws ParseException {
        format.setTimeZone(TimeZone.getTimeZone(
 
"UTC"));
        return format.format(format.parse(format.format(date)));
    }
}

LOC:2017-09-14T18:54:57.612+0800
UTC:2017-09-14T10:54:57.612+0000

Java local 轉UTC時間