why this constructor doesn't give me the right answer

i did a break from programming for a while and i want to realize why this class doesn't give me the right answer i expect to get:

public class Date
{
    private int _day;
    private int _month;
    private int _year;
    public Date(int day, int month, int year)
    {
        _day=day;
        _month=month;
        _year=year;
        if((day<1||day>31)&&(month<1||month>12)&&(year<1000||year>9999))
            {
                _day=26;
                _month=2;
                _year=2019;
            }
        }
    public String toString()
    {
        return _day+"/"+_month+"/"+_year;
    }
    public static void main(String[]args)
    {
        Date test= new Date(5,13,1999);
        System.out.println(test.toString());
    }
}

When I insert the values to "test" object as (32,5,1999) it prints out 26.2.2019 hen I insert the values as (5,14,1999) it prints out 5.14.1999 and when I insert the values as (5,6,900) it prints out as 5.8.900 why don't I get the default values that I set at the constructor when the user inputs an illegal value (26.2.2019) thank you for your answers :)