Java local 转UTC时间

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