Answer:
// here is code in java.
import java.util.*;
// class definition
public class Main {
// main method of the class
public static void main(String[] args) throws Exception {
// Scanner object to read date
Scanner in = new Scanner(System.in);
System.out.print("Enter a date in format mm/dd/yyyy to check:");
// read the date from user
String inp_date = in .next();
// split the date with "/" delimeter
String[] ip = inp_date.split("/");
// find month from date
int inp_month = Integer.parseInt(ip[0]);
// find day from date
int inp_day = Integer.parseInt(ip[1]);
// find year from date
int inp_year = Integer.parseInt(ip[2]);
// boolean variable
boolean flag = true;
// print the input date
System.out.println("Your Entered date was: " + inp_date);
// check month is valid or not
if (inp_month < 1 || inp_month > 12)
{
System.out.println("Entered Date is invalid:");
System.out.println("The input month is not from 1 - 12.");
flag = false;
}
//check day is valid or not
else if (inp_day < 1) {
System.out.println("Entered Date is invalid:");
System.out.println("The value of day is less than 1.");
flag = false;
}
// check days in those month which has 30 days
else if ((inp_month == 4 || inp_month == 6 || inp_month == 9 || inp_month == 11) && inp_day > 30) {
System.out.println("Entered Date is invalid::");
System.out.println("This month have only 30 days, but Entered day is greater than 30.");
flag = false;
}
// if month is February then check leap year and days
else if (inp_month == 2 && ((inp_year % 4 == 0) && (inp_year % 100 != 0))) {
if (inp_day > 29) {
System.out.println("Entered Date is invalid::");
System.out.println("In a leap year, only 29 days in February.");
flag = false;
}
}
// if month is February and year is non-leap
else if (inp_month == 2 && inp_day > 28) {
System.out.println("Entered Date is invalid:");
System.out.println("In a non-leap year, only 28 days in February.");
flag = false;
}
// if all are valid
if (flag)
System.out.println("Entered Date is valid:");
}
}
Explanation:
Read the date from user in mm/dd/yyyy format with the help of Scanner object. Extract day, month and year from the date. Then check whether month is between 1-12 or not and print appropriate message. After that check day is less than 1 or not, if not then print reason. Check the days in those month which has 30 days in it.If month is February then check for leap year and day is greater than 29 then print reason. Else if month is February and year is non-leap then check days whether it is greater than 28 or not. In last If value of flag is true then print date is valid.
Output:
Enter a date in format mm/dd/yyyy to check:2/30/2012
Your Entered date was: 2/30/2012
Entered Date is invalid::
In a leap year, only 29 days in February.
