把毫秒转换成时间

/**
     * 转变从GPS获取到的long类型的微秒转换到时分秒的形式
     * 
     * @param time
     * @return
*/
private static String getTimeFromGPS() {
        SimpleDateFormat sdf = new SimpleDateFormat("HHmmss", Locale.CHINA);
        Date m_date = new Date();
        Calendar c = Calendar.getInstance();
        c.setTime(m_date);
long lMill = c.getTimeInMillis();
        c.setTimeInMillis(lMill);
return sdf.format(c.getTime());
    }