Subtraction of a date from Sql and other from java.

import java.sql.*;
import java.util.*;
public class DateDifference{
       public int daysBetween(java.util.Date d1, java.util.Date d2){
       return (int)( (d2.getTime() - d1.getTime()) / (1000 * 60 * 60 * 24));
       }
     public DateDifference(){
    try{
    Class.forName("com.mysql.jdbc.Driver");
    Connection con = DriverManager.getConnection("jdbc:mysql://localhost:3306/test", "root", "root");
    Statement st=con.createStatement();
    ResultSet rs=st.executeQuery("select dob from student where id=7");
    java.util.Date date=null;
    if(rs.next()){
    java.sql.Date d = rs.getDate("dob");
    date = new java.util.Date(d.getTime());
    }
    java.util.Date currentDate=new java.util.Date();
     System.out.println("Days= "+daysBetween(date,currentDate));
    }
    catch(Exception e){
        System.out.println(e);
    }
    }
    public static void main(String[] args){
      DateDifference inner = new DateDifference();
      }
}