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<!DOCTYPE html>
<html>
<head>
<script>
function displayDate() {
  document.getElementById("demo").innerHTML = Date();
}
</script>
</head>
<body>
<h1>My First JavaScript</h1>
<p id="demo">This is a paragraph.</p>
<button type="button" onclick="displayDate()">Display Date</button>
</body>
</html>