Tryit Editor v2.9

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<!DOCTYPE html>
<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>
</html>