# Program to check if a date is valid or not

• Difficulty Level : Medium
• Last Updated : 07 Feb, 2022

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 the implementation to check if a given year is valid or not.

## C++

 `// C++ program to check if``// given date is valid or not.``#include``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 of 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"``;``}`

## Java

 `// Java program to check if``// given date is valid or not.``import` `java.io.*;` `class` `GFG``{` `    ``static` `int` `MAX_VALID_YR = ``9999``;``    ``static` `int` `MIN_VALID_YR = ``1800``;` `    ``// Returns true if``    ``// given year is valid.``    ``static` `boolean` `isLeap(``int` `year)``    ``{``        ``// Return true if year is``        ``// a multiple of 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.``    ``static` `boolean` `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``    ``public` `static` `void` `main(String args[])``    ``{``        ``if` `(isValidDate(``10``, ``12``, ``2000``))``            ``System.out.println(``"Yes"``);``        ``else``            ``System.out.println(``"No"``);` `        ``if` `(isValidDate(``31``, ``11``, ``2000``))``            ``System.out.println(``"Yes"``);``        ``else``            ``System.out.println(``"No"``);``    ``}``}` `// This code is contributed``// by Nikita Tiwari.`

## Python3

 `# 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`

## C#

 `// C# program to check if``// given date is valid or not.``using` `System;` `class` `GFG``{` `    ``const` `int` `MAX_VALID_YR = 9999;``    ``const` `int` `MIN_VALID_YR = 1800;` `    ``// Returns true if``    ``// given year is valid.``    ``static` `bool` `isLeap(``int` `year)``    ``{``        ` `        ``// Return true if year is a``        ``// multiple of 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.``    ``static` `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``    ``public` `static` `void` `Main()``    ``{``        ` `        ``if` `(isValidDate(10, 12, 2000))``            ``Console.WriteLine(``"Yes"``);``        ``else``            ``Console.WriteLine(``"No"``);` `        ``if` `(isValidDate(31, 11, 2000))``            ``Console.WriteLine(``"Yes"``);``        ``else``            ``Console.WriteLine(``"No"``);``    ``}``}` `// This code is contributed``// by Anant Agarwal.`

## PHP

 ` ``\$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``{``if``(isValidDate(10, 12, 2000))``echo` `"Yes\n"` `;``else``echo` `"No\n"``;` `if``(isValidDate(31, 11, 2000))``    ``echo` `"Yes\n"` `;``else``echo` `"No\n"``;``    ` `}` `// This code is contributed``// by nitin mittal.``?>`

## Javascript

 ``

Output :

```Yes
No```

Time Complexity: O(1)
Auxiliary Space: O(1)
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