function getGreeting(){
   var curDateTime = new Date()
   var curHour = curDateTime.getHours()
   var greeting = 'Good evening!'
   if (curHour < 12  && curHour >= 0)
     greeting = 'Good morning!'
   if (curHour >=12 && curHour < 18)
     greeting = 'Good afternoon!'
   return greeting
   }