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<!DOCTYPE html> <html> <body> <p>Click the button to get a time-based greeting:</p> <button onclick="myFunction()">Try it</button> <p id="demo"></p> <script> function myFunction() { var greeting; var time = new Date().getHours(); if (time < 10) { greeting = "Good morning"; } else if (time < 20) { greeting = "Good day"; } else { greeting = "Good evening"; } document.getElementById("demo").innerHTML = greeting; } </script> </body> </html>