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    copied!<p>First, add numbers as values for months:</p> <pre><code>&lt;select name="mo"&gt; &lt;option disabled="disabled"&gt;SELECT MONTH&lt;/option&gt; &lt;option value="1"&gt;January&lt;/option&gt; &lt;option value="2"&gt;February&lt;/option&gt; &lt;option value="3"&gt;March&lt;/option&gt; &lt;option value="4"&gt;April&lt;/option&gt; &lt;option value="5"&gt;May&lt;/option&gt; &lt;option value="6"&gt;June&lt;/option&gt; &lt;option value="7"&gt;July&lt;/option&gt; &lt;option value="8"&gt;August&lt;/option&gt; &lt;option value="9"&gt;September&lt;/option&gt; &lt;option value="10"&gt;October&lt;/option&gt; &lt;option value="11"&gt;November&lt;/option&gt; &lt;option value="12"&gt;December&lt;/option&gt; &lt;/select&gt; </code></pre> <p>Then use <a href="http://php.net/manual/en/function.checkdate.php" rel="nofollow">checkdate()</a>:</p> <pre><code>&lt;?php $month = $_POST["mo"]; $day = $_POST["theDay"]; $yr = $_POST["year"]; if (checkdate($month, $day, $yr) !== true) { // ? } ?&gt; </code></pre> <p>And if you want to do it in the browser as well, first add an onsubmit handler to the year form:</p> <pre><code>&lt;FORM method="POST" action="&lt;?php echo $PHP_SELF;?&gt;" onsubmit="return checkLeap(this);"&gt; </code></pre> <p>Then your function:</p> <pre><code>function checkLeap(form) { var month = form.mo.options[form.mo.selectedIndex].value; var day = form.theDay.options[form.theDay.selectedIndex].value; var year = form.year.options[form.year.selectedIndex].value; if (month == 2 &amp;&amp; day == 29 &amp;&amp; (new Date(year,month,year).getDate() != 29)) { alert('That is not a leap year. Please fix.'); return false; } return true; } </code></pre>
 

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