public static void main(String[] args) throws ParseException {
SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
String nowStr = dateFormat.format(new Date());
String endStr = nowStr.substring(0,nowStr.indexOf(" ")) + " 23:59:59";
System.out.println("相差的秒数:"+((dateFormat.parse(endStr).getTime() - dateFormat.parse(nowStr).getTime()) / 1000));
}