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Ejemplo 1: temporizador html
<!DOCTYPEHTML><html><head><meta name="viewport" content="width=device-width, initial-scale=1"><style>
p
text-align: center;
font-size:60px;
margin-top:0px;</style></head><body><p id="demo"></p><script>// Set the date we're counting down tovar countDownDate =newDate("Jan 5, 2021 15:37:25").getTime();// Update the count down every 1 secondvar x =setInterval(function()// Get today's date and timevar now =newDate().getTime();// Find the distance between now and the count down datevar distance = countDownDate - now;// Time calculations for days, hours, minutes and secondsvar days = Math.floor(distance /(1000*60*60*24));var hours = Math.floor((distance %(1000*60*60*24))/(1000*60*60));var minutes = Math.floor((distance %(1000*60*60))/(1000*60));var seconds = Math.floor((distance %(1000*60))/1000);// Output the result in an element with id="demo"
document.getElementById("demo").innerHTML = days +"d "+ hours +"h "+ minutes +"m "+ seconds +"s ";// If the count down is over, write some text if(distance <0)clearInterval(x);
document.getElementById("demo").innerHTML ="EXPIRED";,1000);</script></body></html>Ejemplo 2: cuenta regresiva en js
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