In this we are taking date, month and year with three different variable and then check whether the date is valid or not. The below program shows how to check whether the data value is valid or not. Example import java.util.*; class GetBirthDate { //get the birthdate of his or her public static void main(String args[]) { int dt,month,year,leap=0,noOfDay=0; Scanner sc=new Scanner(System.in); System.out.println("Enter Birth Year"); year=sc.nextInt(); if(year>2019) { System.out.println("Year Is Invalid Please Enter Proper Year"); } else { if(year%4==0) { leap=1; } System.out.println("Enter Birth Month"); month=sc.nextInt(); switch(month) { case 1: noOfDay=31; break; case 2: if(leap==1) noOfDay=29; else noOfDay=28; break; case…