Untitled

<html>
<head>
  <title>Date Input with PHP Filtering</title>
  <script src="date_validation.js"></script>
</head>
<body>
  <form method="post" action="process_date.php">
    <label for="preformattedDate">Preformatted Date (YYYY-MM-DD):</label>
    <input type="date" id="preformattedDate" name="preformattedDate" placeholder="YYYY-MM-DD">
    <input type="submit" value="Submit">
  </form>
</body>
</html>