var currentdate=new Date();
var currenthour=currentdate.getHours();
if(currenthour<8)
 document.write("早上好！");
else if(currenthour<12)
 document.write("上午好！");
else if(currenthour<19)
 document.write("下午好！");
else
 document.write("晚上好！");

var currentyear=currentdate.getYear();
var currentmonth=currentdate.getMonth()+1;
var currentdateofmonth=currentdate.getDate();
document.write("现在是 "+currentyear+"-"+currentmonth+"-"+currentdateofmonth+" ");

var currentday=currentdate.getDay();
var sday;
if(currentday==0)
 sday='星期日';
else if(currentday==1)
 sday='星期一';
else if(currentday==2)
 sday='星期二';
else if(currentday==3)
 sday='星期三';
else if(currentday==4)
 sday='星期四';
else if(currentday==5)
 sday='星期五';
else if(currentday==6)
 sday='星期六';
document.write(sday);