时间比较
目标日期在当前日期之前：before parse.before(date)
目标日期在当前日期之后：after parse.after(date)
public static void main(String[] args) throws ParseException {
SimpleDateFormat sdf=new SimpleDateFormat("yyyy-MM-dd");
String old = "2023-09-09";
Date parse = sdf.parse(old);
Date date = new Date();
System.out.println(parse.before(date));
}