<html>
<body>
<p>Clck the button to display "Good day", only if the time is less than 20:00.</p>
<button onclick="myFunction()">Try it</button>
<p id="demo"></p>
<script>
function myFunction() {
var time = new Date().getHours();
if (time < 20) {
document.getElementById("demo").innerHTML = "Good day";
}
}
</script>
</body>
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</html>