JavaScript Project - Countdown Timer

In this tutorial, we will learn how to create a simple Countdown Timer JavaScript project.

We will create a Countdown Timer JavaScript project which will start countdown up to 31st Dec of 2020.

1. index.html

Let's create index.html and add the following code to it:

<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8" /> <meta name="viewport" content="width=device-width, initial-scale=1.0" /> <title>Countdown Timer</title> <link rel="stylesheet" href="style.css" /> <script src="script.js" defer></script> </head> <body> <h1>End of Year 2020</h1> <div class="countdown-container"> <div class="countdown-el days-c"> <p class="big-text" id="days">0</p> <span>days</span> </div> <div class="countdown-el hours-c"> <p class="big-text" id="hours">0</p> <span>hours</span> </div> <div class="countdown-el mins-c"> <p class="big-text" id="mins">0</p> <span>mins</span> </div> <div class="countdown-el seconds-c"> <p class="big-text" id="seconds">0</p> <span>seconds</span> </div> </div> </body> </html>

2. script.js

Let's create JavaScript file named script.js and add following JavaScript code to it:

const daysEl = document.getElementById("days"); const hoursEl = document.getElementById("hours"); const minsEl = document.getElementById("mins"); const secondsEl = document.getElementById("seconds"); const newYears = "31 Dec 2020"; function countdown() { const newYearsDate = new Date(newYears); const currentDate = new Date(); const totalSeconds = (newYearsDate - currentDate) / 1000; const days = Math.floor(totalSeconds / 3600 / 24); const hours = Math.floor(totalSeconds / 3600) % 24; const mins = Math.floor(totalSeconds / 60) % 60; const seconds = Math.floor(totalSeconds) % 60; daysEl.innerHTML = days; hoursEl.innerHTML = formatTime(hours); minsEl.innerHTML = formatTime(mins); secondsEl.innerHTML = formatTime(seconds); } function formatTime(time) { return time < 10 ? `0${time}` : time; } // initial call countdown(); setInterval(countdown, 1000);

style.css

Let's create CSS file named style.css and add the following CSS code to it:

@import url("https://fonts.googleapis.com/css2?family=Poppins:wght@200;400;600&display=swap"); * { box-sizing: border-box; } body { background-size: cover; background-position: center center; display: flex; flex-direction: column; align-items: center; min-height: 100vh; font-family: "Poppins", sans-serif; margin: 0; } h1 { font-weight: normal; font-size: 4rem; margin-top: 5rem; } .countdown-container { display: flex; flex-wrap: wrap; justify-content: center; } .big-text { font-weight: bold; font-size: 6rem; line-height: 1; margin: 1rem 2rem; } .countdown-el { text-align: center; } .countdown-el span { font-size: 1.3rem; }

Run index.html in Browser

Let's open the index.html file in browser and you will be able see following screen:

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