[j0hnik]

<input type="number" id="day">Дней<br>
	<input type="number" id="hour">Часов<br>
	<input type="number" id="min">Минут<br>
	<button id="st">start</button>
	<div id="time"></div>
	<script>

		var end;
		function timer(){
			var now = new Date(),
			ost = new Date(end - now),
			s = Math.floor(ost/1000),
			m = Math.floor(s/60),
			h = Math.floor(m/60),
			d = Math.floor(h/24);
			s = s%60+'';
			m = m%60+'';
			h = h%24+'';
			d = d+'';
			if(ost>0){
				setTimeout(timer, 1000);
				time.textContent = `${d}-дней ${h}-часов ${m}-минут ${s}-секунд`;
			}
			else window.open("http://google.com");
		}
		st.onclick = e =>{
			end = Date.now() + ( day.value*86400000 ) + ( hour.value*3600000) + ( min.value* 60000);
			timer();
		};

	</script>