datetoday = new Date();
timenow=datetoday.getTime();
datetoday.setTime(timenow);
thehour = datetoday.getHours();
if (thehour >= 18) display = "Goedenavond, ";
else if (thehour >= 12) display = "Goedemiddag, ";
else if (thehour >= 6) display = "Goedemorgen, ";
else display = "Goedenacht, ";
var greeting = (display);
document.write(greeting);