將格林威治時間轉換爲北京時間

	Date nowTime = new Date(); // 要轉換的時間
        Calendar cal = Calendar.getInstance();
        cal.setTimeInMillis(nowTime.getTime());
        
        Log.i("OTH","北京時間：" + cal.getTime().toString().substring(0, 19));
        
        cal.add(Calendar.HOUR, -8);
        Log.i("OTH","格林威治時間：" + cal.getTime());