ValidDate2011_3

import java.io.*;
class ValidDate2011_3
{
int days[]={31,28,31,30,31,30,31,31,30,31,30,31};
BufferedReader br=new BufferedReader(new InputStreamReader(System.in));
int d,m,y;
public void takeDate() throws Exception
{
System.out.println("Enter date of birth in dd mm yyyy format:");
d=Integer.parseInt(br.readLine());
m=Integer.parseInt(br.readLine());
y=Integer.parseInt(br.readLine());
if(m>12)
{
System.out.println("INVALID MONTH");
return;
}
else if(d>12)
{
System.out.println("INVALID DATE");
return;
}
y=validDate(d,m,y);
if(y>0)
{
System.out.println("VALID DATE \n"+y);
}
else
{
System.out.println("INVALID DATE");
return;
}
}
int validDate(int d1,int m1,int y1)
{

int li,i;
li=leap(y1);
if(d1>days[m1-1])
return 0;
else
{
for(i=0;i< m1-1;i++)
{
d1=d1+days[i];
}
d1=d1+li;
return d1;
}
}
int leap(int y)
{
if(y%100==0 && y%400==0)
return 1;
else if(y%100!=0 && y%4==0)
return 1;
else
return 0;
}
public static void main(String args[]) throws Exception
{
ValidDate2011_3 ob=new ValidDate2011_3();
ob.takeDate();
}
}