You can escape it using backslash character. Replace %> with %/>. Following example showcases the same.
<html>
<head>
<title>A Comment Test</title>
</head>
<body>
<h2>Syntax: <\%= (new java.util.Date()).toLocaleString() %\></h2>
<p>Today's date: <%= (new java.util.Date()).toLocaleString()%></p>
</body>
</html>