Intro

In this article I am going to build a beautiful countdown timer just using html , CSS and vanilla JavaScript.
Our countdown timer will show us the time left till a particular date and time.

Making the structure

We all know that Html is used for structuring an web dev project.

<main>
      <h1>Time remaining for the Fest</h1>
      <div class="countdown-container">
        <div class="days-c">
          <p class="big-text" id="days"></p>
          <span>Days</span>
        </div>
        <div class="hours-c">
          <p class="big-text" id="hours"></p>
          <span>Hours</span>
        </div>
        <div class="minutes-c">
          <p class="big-text" id="minutes"></p>
          <span>Minutes</span>
        </div>
        <div class="seconds-c">
          <p class="big-text" id="seconds"></p>
          <span>Seconds</span>
        </div>
      </div>
    </main>

Here I am putting all the micro elements of our countdown timer within a div so that we can give our timer a box like shape and a beautiful UI by adding a background image .Again I have separated the <p> & <span> within a separate div with different class names to classify each of the elements i.e. days, hrs , mins and seconds. Let's make it easy , consider the body element is the whole screen of any device and the <div class='countdown-timer '></div> is a box, containing four more boxes i.e. the days, hrs, mins and seconds. See the image below

Designing our timer

Now our structure is ready so let's add some CSS to give our countdown timer a beautiful look.

`<body>`

I want all my elements to the center of a screen also I want the whole screen to have a background color and to make these things happen I will use

body
{
  display: flex;
  align-items: center;
  justify-content: center;
  background-color: #eeee;
}

`<main>`

Here I am going to create a beautiful box like structure having a height and with of 25 and 30 rems respectively with a beautiful background image

main {
  background: url(https://images.unsplash.com/photo-1646429411544-b735d4c77bb7?ixlib=rb-1.2.1&ixid=MnwxMjA3fDB8MHxwaG90by1wYWdlfHx8fGVufDB8fHx8&auto=format&fit=crop&w=872&q=80);
  height: 25rem;
  width: 30rem;
  color: white;
  border-radius: 10px;
}

this is how it looks like now

fixing the font an size

.countdown-container span {
  margin: 1.5rem;
  font-size: 1rem;
  font-weight: 500;
}

.big-text {
  margin: 1rem;
  font-size: 3rem;
  font-weight: bolder;
  padding: 5px;
}

Aligning the `countdown-container`

.countdown-container {
  padding: 1rem;
  margin: 1rem;
  display: flex;
  justify-content: center;
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

Adding the values dynamically

Now our styling part is over so let's add the timer values dynamically, and for this I will add some JavaScript to it

grabbing the elements

Now we will grab our micro elements to add values

const days = document.getElementById('days')
const hours = document.getElementById('hours')
const minutes = document.getElementById('minutes')
const seconds = document.getElementById('seconds')

defining and calling a function

As we are building a countdown timer we need a date object , also we will use the JavaScript Math.floor() for filtering desires values. Now, the first task is to get the remaining time

 //the final date   
    const fest = new Date(2022, 3, 2);
  // the system date   
  const current = new Date();
  //time remianing   
  const sec = (fest - current) / 1000;

we are subtraction of two days will provide us a value in milliseconds so we diving it with 1000 to get the value in seconds now lets convert it to days , hrs , mins and sec

    const d = Math.floor(sec / 3600 / 24);
    const hrs = Math.floor(sec / 3600) % 24;
    const min = Math.floor(sec / 60) % 60;
    const s = Math.floor(sec) % 60

Now we have our values so let's add these to our html dynamically using the innerText property

    days.innerText = d;
    hours.innerText = hrs;
    minutes.innerText = min;
    seconds.innerText = s;

now to change the values every second we will use the setInterval(handler, milisec)

putting it together

const days = document.getElementById('days')
const hours = document.getElementById('hours')
const minutes = document.getElementById('minutes')
const seconds = document.getElementById('seconds')

function goCountown() {
  //the final date   
    const fest = new Date(2022, 3, 2);
  // the system date   
  const current = new Date();
  //time remianing   
  const sec = (fest - current) / 1000;
    const d = Math.floor(sec / 3600 / 24);
    const hrs = Math.floor(sec / 3600) % 24;
    const min = Math.floor(sec / 60) % 60;
    const s = Math.floor(sec) % 60
    days.innerText = d;
    hours.innerText = hrs;
    minutes.innerText = min;
    seconds.innerText = s;
}
goCountown()

setInterval(goCountown, 1000)

Conclusion

I this article I have covered some important topics like CSS flex , JavaScript Dates and Math.floor(). I hope this article will help everyone to gain web dev basic knowledge. Feel free to comment , react and share this article if you love this. Thanks for giving you precious time for reading my article. Stay tuned for the next. Happy coding !

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Building a JavaScript Countdown timer in just 10 mins