Hi makenzi.exc,
Use the meta tag and set the following attribute.
http-equiv - refresh
content - 2 (In second)
Refer below example.
HTML
<!DOCTYPE html>
<html>
<head>
    <meta charset="utf-8" />
    <meta http-equiv="refresh" content="2">
    <title></title>
    <style type="text/css">
        body { font-family: Arial; font-size: 10pt; padding-left: 20px; }
    </style>
</head>
<body>
    <span id="lblDateTime"></span>
    <script type="text/javascript">
        window.onload = function () {
            document.getElementById("lblDateTime").innerHTML = "Page refreshed at: " + new Date().toLocaleString();
        };
    </script>
</body>
</html>
 
Demo
Screenshot

 
Downloads
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