import java.util.Scanner;

    public class Dates

    {
        public static void main(String[] args)
         {
          int month, day, year; //date read in from user
          int daysInMonth; //number of days in month read in

          boolean monthValid, yearValid, dayValid; //true if input from user is valid
          boolean leapYear; //true if user's year is a leap year

          Scanner scan = new Scanner(System.in);

    System.out.print ("Enter Month as a number: ");
    month = scan.nextInt();

    System.out.print ("Enter in the day:");
    day = scan.nextInt();

    System.out.print ("Enter in the year in the 2nd-millennium:");
    year = scan.nextInt();

    //Get integer month, day, and year from user

       if (month >= 1 && month <=12)
              monthValid = true; //Check to see if month is valid

    if (year >=1000 && year <= 1999)
              yearValid = true; //Check to see if year is valid

          //Determine whether it's a leap year

    if (year % 400 == 0)
      {
             leapYear = true;
      }
      else if (year % 4 == 0)
      {
              if (year %100 == 0)
        {
               leapYear = false;
    }
      else
         {
                 leapYear = true;
         }
    }

          //Determine number of days in month

    daysInMonth = 31;

    if (month == 4 || month == 6 || month == 9 || month == 11)
      {
       daysInMonth = 30;
      }
      else
      {
        if (month == 2 && leapYear == true)
         daysinmonth = 29;
              }
    else
    {
                  daysinmonth = 28;
              }
    }

    if (monthValid == false)
        daysInMonth = 0;

          //User number of days in month to check to see if day is valid

    if (day == daysInMonth)
       {
    dayValid = true;
    }
    else
    {
      dayValid = false;
    }


          //Determine whether date is valid and print appropriate message

         }
    }