Accessing Private Int in a Subclass

Superclass source code
public class Date {
private int month;
private int day;
private int year;

public Date() {
setMonth(1);
**day = 1;**
setYear(1900);
}

public Date(int month, int day, int year) {
this.setMonth(month);
this.**day** = day;
this.setYear(year);
}

Month and Year works fine because I can use the setMonth and setYear in my subclass. However, when I try to use day it says the var is not visible because its private. There is no setter for day in the superclass but there is a getter. What should the setter look like? Furthermore, what should my subclass contructor look like?

Subclass contructor
public EDate(int month, int day, int year)
{

this.setMonth(month);
day = getDay();
this.setYear(year);
}

Subclass Day setter
public void setDay(int newInt) {
if (isGooddDate(getMonth(), newInt, getYear())==true)
{
newInt = this.getDay();
}

Any help is much appreciated!