Program to check if a date is valid or not

1.6

Given a date, check if it is valid or not. It may be assumed that the given date is in range from 01/01/1800 to 31/12/9999.

Examples :

Input : d = 10, m = 12, y = 2000
Output : Yes
The given date 10/12/2000 is valid

Input  : d = 30, m = 2, y = 2000
Output : No
The given date 30/2/2000 is invalid. The
February month cannot have 30 as day.

The idea is simple. We need to handle following things.
1) y, m and d are in allowed range.
2) Days in February are in allowed range and leap year is handled.
3) Days in 30 day months are handled.

Below is C++/Python implementation to check if a given year is valid or not.

C++

// C++ program to check if given date is valid
// or not.
#include<iostream>
using namespace std;

const int MAX_VALID_YR = 9999;
const int MIN_VALID_YR = 1800;

// Returns true if given year is valid.
bool isLeap(int year)
{
  // Return true if year is a multiple pf 4 and
  // not multiple of 100.
  // OR year is multiple of 400.
  return (((year%4==0) && (year%100!=0)) ||
           (year%400==0));
}

// Returns true if given year is valid or not.
bool isValidDate(int d, int m, int y)
{
    // If year, month and day are not in given range
    if (y > MAX_VALID_YR || y < MIN_VALID_YR)
      return false;
    if (m < 1 || m > 12)
      return false;
    if (d < 1 || d > 31)
      return false;

    // Handle February month with leap year
    if (m == 2)
    {
        if (isLeap(y))
           return (d <= 29);
        else
           return (d <= 28);
    }

    // Months of April, June, Sept and Nov
    // must have number of days less than
    // or equal to 30.
    if (m==4 || m==6 || m==9 || m==11)
        return (d <= 30);

    return true;
}

// Driver code
int main(void)
{
   isValidDate(10, 12, 2000)? cout << "Yes\n" :
                              cout << "No\n";

   isValidDate(31, 11, 2000)? cout << "Yes\n" :
                              cout << "No\n";
}

Python

 #Python Program to check 
#if a date is valid or not

import datetime
def date_validation(day, month, year):
    
    isValidDate = True
    
    try :
        datetime.datetime(int(year), int(month), int(day))
        
    except ValueError :
        isValidDate = False
        
    if(isValidDate) :
        print ("Yes")
    else :
        print ("No")

date_validation(10,12,2000) 
date_validation(31,11,2000)

#This code is contributed by ajay0007

Output :

Yes
No

This article is contributed by RAHUL NITKKR. If you like GeeksforGeeks and would like to contribute, you can also write an article using contribute.geeksforgeeks.org or mail your article to contribute@geeksforgeeks.org. See your article appearing on the GeeksforGeeks main page and help other Geeks.

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