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    <p>There were three errors in your code, see the comments inline below:</p> <p>The year value of first option was 991 instead of 1991, might cause you to think the calculation is wrong.</p> <p>String containing date that is being assigned to birth variable has to be passed as parameter to Date() function to create a date object that can be used with the current date object below it.</p> <p>Variable milliDay was declared, then you were trying to use milliday (wrong case D).</p> <pre><code>&lt;input name= "date" type="text" readonly="readonly" /&gt; &lt;select id="Ultra" onchange="run()"&gt; &lt;option value="11/15/1991"&gt;1991-11-15&lt;/option&gt; &lt;!-- year value was 991 instead of 1991, might cause you to think the calculation is wrong --&gt; &lt;option value="10/23/1992"&gt;1992-10-23&lt;/option&gt; &lt;/select&gt;&lt;br&gt;&lt;br&gt; TextBox1&lt;br&gt; &lt;input type="text" id="srt" placeholder="get value on option select" readonly="readonly"&gt;&lt;br&gt; &lt;script type="text/javascript"&gt; function run() { var birth = new Date(document.getElementById("Ultra").value); //string containing date has to be passed as parameter to Date() function to create a date object that can be used with the current date object below var check = new Date(); var milliDay = 1000 * 60 * 60 * 24; var AgeinDay = (check - birth) / milliDay; //variable here was milliday all small case, declared above as milliDay with a capital D var ComputAge = Math.floor(AgeinDay / 365 ); var age = ComputAge / 365; document.getElementById("srt").value = age; } &lt;/script&gt; </code></pre> <p>This will return the following values assuming the first option is selected:</p> <p>age: 0.057534246575342465</p> <p>ComputAge: 21</p> <p>Are you just trying to get the age in years, or months, days hours too?</p>
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    1. POAge Calculator in Javascript
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    1. COIm trying to get it on Years :)
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    2. COOk, then you just need the ComputAge variable, no need to divide by 365 :)
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