I am trying to format a datepicker to have a specific format. The format

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Asked: May 27, 20262026-05-27T04:40:33+00:00 2026-05-27T04:40:33+00:00

I am trying to format a datepicker to have a specific format. The format

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I am trying to format a datepicker to have a specific format. The format I am looking for is ISO 8601 yy-mm-dd. Something is wrong inside $(function), but I’m not sure what.

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="utf-8">
    <title>jQuery UI Datepicker - Format date</title>
    <link rel="stylesheet" href="<?php echo $jquery_css?>" type="text/css" />

    <script type="text/javascript" src="<?php echo $jquery?>"></script>
    <script type="text/javascript" src="<?php echo $jquery_ui?>"></script>

    <script type="text/javascript">

    $(function() {
        $.datepicker.formatDate('yy-mm-dd', "datepicker");
    });
    </script>
</head>
<body>

<div class="demo">

<p>Date: <input type="text" id="datepicker" size="30"/></p>

</div>