Date value set to current datetime, after recall the date value is null

Output as below

D:\Example\javaux\OO>java appmotor
The engine is now on. Tue Oct 10 23:44:41 CST 2006 (Yamaha RZ350)
Engine Start date = Tue Oct 10 23:44:41 CST 2006

Detail:
        Model is Yamaha RZ350
        Color is Yello
        Year is 2003
        Engine Started on null

D:\Example\javaux\OO>

"Engine Started" should not null , should be Tue Oct 10 23:44:41 CST
2006.

What wrong as below two java program ?

import java.util.*;
import java.text.*;

class Motorcycle {

private String Model;
private String Color;
private int Year;
private Date EngineStartDate;
private boolean engineStatus = false;

void setModel (String loName) {
    this.Model = loName;
}

void setColor(String loColor) {
    this.Color = loColor ;
}

void setYear (int loYear) {
    this.Year = loYear;

}

public String getEngineStartDate() {

     return "xx";

}

void showDetail() {
    System.out.println("\nDetail:");
    System.out.println("\tModel is " + this.Model);
    System.out.println("\tColor is " + this.Color);
    System.out.println("\tYear is " + this.Year);
    System.out.println("\tEngine Started on " + EngineStartDate +
"\n");

}
public void startEngine() {
  if (engineStatus == true)
   System.out.println("The engine is alreay on. " + EngineStartDate +
" (" + this.Model + ")");
  else {
     engineStatus = true;
     Date EngineStartDate = new Date();
     System.out.println("The engine is now on. " + EngineStartDate +
" (" + this.Model+ ")");
     System.out.println("Engine Start date = " + EngineStartDate);
     }
 }
}

/* eof */

import java.lang.*;
/* Testing Inheritance */
class M2 extends Motorcycle {
   private int speed;
   public void setSpeed(int loSpeed) {
    this.speed = loSpeed ;
   }
   public int getSpeed() {
    return this.speed;
   }
}

/* Main Part */
public class appmotor {
public static void main (String args[]) {

   M2 m = new M2();

   m.setModel ("Yamaha RZ350");
   m.setColor ("Yello");
   m.setYear (2003);

   m.startEngine();
   m.showDetail();

 // m.startEngine();
  // m.showDetail();

}
}