<script src="//cdnjs.cloudflare.com/ajax/libs/processing.js/1.4.1/processing-api.min.js"></script><script>
var now = new Date();
var hrs = now.getHours();
var msg = "";
if (hrs >= 0){
alert("Mornin' Sunshine!");
} elseif (hrs > 15){
alert("Good morning");
} elseif (hrs > 12){
alert("Good afternoon");
} elseif (hrs > 17){
alert("Good evening");
} elseif (hrs > 22){
alert("Go to bed!");
}
</script>