java 换算时区的问题

Question

目前通过
SimpleDateFormat("ddMMyy hhmmss").parse(String)
来取得字符串中的日期时间信息，但该信息是0时区的，如何简便地转换成东8区并输出？

Answer 1

import java.util.*;
public class Now {        public static void main(String[] args){                Calendar cal=Calendar.getInstance(TimeZone.getTimeZone("EST"));
                //Calendar cal=Calendar.getInstance(TimeZone.getDefault());
                String DATE_FORMAT="yyyy-MM-dd HH:mm:ss";
                java.text.SimpleDateFormat sdf=
                        new java.text.SimpleDateFormat(DATE_FORMAT);
                sdf.setTimeZone(TimeZone.getTimeZone("EST"));
                //sdf.setTimeZone(TimeZone.getDefault());
                System.out.println("Now:"+sdf.format(cal.getTime()));        }
}

Answer 2

public static Date fromDateString(String dateString, String fromFormat)
    {
        GregorianCalendar gc = new GregorianCalendar();
        SimpleDateFormat df = new SimpleDateFormat(fromFormat);
        df.setTimeZone(gc.getTimeZone());
        df.setLenient(false);
        Date date = df.parse(dateString, new ParsePosition(0));
        return date;
    }