var d = new Date()
var hour = d.getHours();

if (hour >= 0 && hour < 12)
{
	document.write("Good Morning. ")
}

if (hour >= 12 && hour < 18)
{
	document.write("Good Afternoon. ")
}

if (hour >= 18 && hour < 24)
{
	document.write("Good Evening. ")
}