Java Programming

hi everyone

what i am trying to do is get the difference of days between two dates.
first im creating a Calendar and then getting todays date and then i get another date from a database through jdbc....
i want to compare those two dates...if the difference is 4 days , i want to do something specific,....
im not being able to accomplish that....
is there is some kind of method in the API that does that....

this is my source code....

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import java.util.Calendar;
import java.util.Date;

public class DateThing {
    
    private Calendar c = Calendar.getInstance();
    private Date tD = new Date(c.get(Calendar.YEAR),c.get(Calendar.MONTH),c.get(Calendar.DAY_OF_MONTH));
    private Date dtc = null;
    
    
    /** Creates a new instance of DateThing */
    public DateThing(){
        dtc = getRetDate();
        
        if(tD.compareTo(dtc) > 0){
            int time = c.get(Calendar.DAY_OF_YEAR) - dtc.getDay();
            System.out.println(time);
        }
    }
    
    public Date getRetDate(){
        Date d = null;
        try {
            Class.forName("com.mysql.jdbc.Driver").newInstance();
            Connection con = DriverManager.getConnection("jdbc:mysql://localhost/dvd", "root", "password");
            
            String sql = "SELECT retdate " +
                    "FROM rental " +
                    "WHERE title_id = 245";
            
            Statement stmt = con.createStatement();
            ResultSet rs = stmt.executeQuery(sql);
            
            while(rs.next()){
                d = rs.getDate("retdate");
            }
            
            stmt.close();
            con.close();
        } catch (IllegalAccessException ex) {
            ex.printStackTrace();
        } catch (InstantiationException ex) {
            ex.printStackTrace();
        } catch (ClassNotFoundException ex) {
            ex.printStackTrace();
        } catch (SQLException ex) {
            ex.printStackTrace();
        }                        
        return d;
    }
    
    public static void main(String[] args){
        new DateThing();
    }
    
}

the date returned from the database is 2007-8-20 and todays date is 2007-8-25 so the integer time must have 5 in it....

please help me

thanks in advance