---
layout: page
title: "JavaScript checkdate function"
comments: true
sharing: true
footer: true
alias:
- /functions/view/checkdate:366
- /functions/view/checkdate
- /functions/view/366
- /functions/checkdate:366
- /functions/366
---
<!-- Generated by Rakefile:build -->
A JavaScript equivalent of PHP's checkdate

{% codeblock datetime/checkdate.js lang:js https://raw.github.com/kvz/phpjs/master/functions/datetime/checkdate.js raw on github %}
function checkdate (m, d, y) {
  // From: http://phpjs.org/functions
  // +   original by: Kevin van Zonneveld (http://kevin.vanzonneveld.net)
  // +   improved by: Pyerre
  // +   improved by: Theriault
  // *     example 1: checkdate(12, 31, 2000);
  // *     returns 1: true
  // *     example 2: checkdate(2, 29, 2001);
  // *     returns 2: false
  // *     example 3: checkdate(3, 31, 2008);
  // *     returns 3: true
  // *     example 4: checkdate(1, 390, 2000);
  // *     returns 4: false
  return m > 0 && m < 13 && y > 0 && y < 32768 && d > 0 && d <= (new Date(y, m, 0)).getDate();
}
{% endcodeblock %}

 - [Raw function on GitHub](https://github.com/kvz/phpjs/blob/master/functions/datetime/checkdate.js)

Please note that php.js uses JavaScript objects as substitutes for PHP arrays, they are 
the closest match to this hashtable-like data structure. 

Please also note that php.js offers community built functions and goes by the 
[McDonald's Theory](https://medium.com/what-i-learned-building/9216e1c9da7d). We'll put online 
functions that are far from perfect, in the hopes to spark better contributions. 
Do you have one? Then please just: 

 - [Edit on GitHub](https://github.com/kvz/phpjs/edit/master/functions/datetime/checkdate.js)

### Example 1
This code
{% codeblock lang:js example %}
checkdate(12, 31, 2000);
{% endcodeblock %}

Should return
{% codeblock lang:js returns %}
true
{% endcodeblock %}

### Example 2
This code
{% codeblock lang:js example %}
checkdate(2, 29, 2001);
{% endcodeblock %}

Should return
{% codeblock lang:js returns %}
false
{% endcodeblock %}

### Example 3
This code
{% codeblock lang:js example %}
checkdate(3, 31, 2008);
{% endcodeblock %}

Should return
{% codeblock lang:js returns %}
true
{% endcodeblock %}


### Other PHP functions in the datetime extension
{% render_partial _includes/custom/datetime.html %}