Flip Countdown Clock With JS And CSS3 – Countdown.js

A pure JavaScript countdown clock that makes uses of CSS3 to flip days/hours/minutes/seconds slots when counting down.

How to use it:

Create the HTML for the countdown clock.

<div id="clock"></div>
<div id="units">
  <span>Days</span>
  <span>Hours</span>
  <span>Minutes</span>
  <span>Seconds</span>
</div>

Put the Countdown.js at the bottom of the webpage.

<script src='countdown.js'></script>

Set the time the clock will countdown from.

window.onload = () => {
  const deadline = new Date("December 23, 2018 13:00:00");
  startTimer("clock", deadline)
};

Animate the countdown clock with the following CSS/CSS3.

#clock span {
    float: left;
    text-align: center;
    font-size: 60px;
    margin: 0 2.5%;
    color: #ffffff;
    padding: 20px;
    width: 20%;
    border-radius: 20px;
    box-sizing: border-box;
}
#clock span:nth-child(1) {
    background: #C70039;
}
#clock span:nth-child(2) {
    background: #FF5733;
}
#clock span:nth-child(3) {
    background: #FFC300;
}
#clock span:nth-child(4) {
    background: #C9E498;
}
#clock:after {
    content: "";
    display: block;
    clear: both;
}
#units span {
    float: left;
    width: 25%;
    text-align: center;
    margin-top: 30px;
    color: #D7DBDD;
    text-transform: uppercase;
    font-size: 13px;
    letter-spacing: 2px;
    text-shadow: 1px 1px 1px rgba(10, 10, 10, 0.7)
}
span.turn {
    animation: turn 0.5s ease forwards;
}
@keyframes turn {
    0% {
        transform: rotateY(0deg)
    }
    100% {
        transform: rotateY(360deg)
    }
}