// JavaScript Document

function getHour(){
        var currentTime = new Date();
        return (currentTime.getHours());
      }
       
      function doGreeting(){
        var hour=getHour();
        var greeting="";
         
        if (hour>0 && hour<12) greeting="Bom Dia";
        else if(hour>=12 && hour<19) greeting="Boa Tarde";
        else greeting="Boa Noite";
          
        return (greeting+",");
      }