javascript set target date and time tomorrow at hour -

i'm trying make count down timer counts down couple different hours depending on time of day.

here's how i've tried set function time. if before 14.00, count down 14.00 , if it's after 14.00, count down 20.00. after 20.00, show count down 14.00 tomorrow.

ive tried set target time this, setting date "tomorrow @ 14.00" cant work.

var target_date = new date(); var currentdate = new date();  if (currentdate.gethours() > 0 && currentdate.gethours() < 14) {    target_date.sethours(14,0,0,0); } else if (currentdate.gethours() > 14 && currentdate.gethours() < 20) {    target_date.sethours(20,0,0,0);  }  else {    target_date.setdate(currentdate.getdate()+1).sethours(16,0,0,0); // if 20-24, count down tomorrow @ 14.00 } 

the rest of script count down is

var days, hours, minutes, seconds;  var countdown = document.getelementbyid("countdown");  setinterval(function () {     var current_date = new date().gettime();    var seconds_left = (target_date - current_date) / 1000;    days = parseint(seconds_left / 86400);    seconds_left = seconds_left % 86400;    hours = parseint(seconds_left / 3600);    seconds_left = seconds_left % 3600;    minutes = parseint(seconds_left / 60);    seconds = parseint(seconds_left % 60);      countdown.innerhtml = hours + "t "    + minutes + "m";    }, 1000)}; 

 target_date.setdate(currentdate.getdate()+1).sethours(16,0,0,0);  

setdate() method doesn't return date object, sequence wouldn't work

you should write

 target_date.setdate(currentdate.getdate()+1);  target_date.sethours(16,0,0,0);