d = new Date()
hourValue = d.getHours()

if (hourValue < 12)
    {
    greeting = "Good morning!"
    }
else if (hourValue == 12)
    {
    greeting = "Good afternoon!"
    }
else if (hourValue < 18)
    {
    greeting = "Good afternoon!"
    }
else
    {
    greeting = "Good evening!"
    }

document.write(greeting)