Date Calculator

Javascript

Date Calculator

HiroDaegu 2022. 6. 15. 01:30

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<!DOCTYPE html>
<html lang="ko">
<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>DATE CALCULATOR</title>
  <link rel="stylesheet" href="style.css">
  <script defer src="main.js"></script>
</head>
<body>
  <header>
    <h1>DATE CALCULATOR</h1>
    <p>How many days are there between two dates?</p>
    <p>(Change a date to automatically calculate the difference)</p>
  </header>
  <div>
    <form action="#">
      <label>Start date</label>
      <input type="date" name="start_date">
      <label>End date</label>
      <input type="date" name="end_date">
    </form>
    <p>
      Time elapsed:
      <span class="date_span"></span>
    </p>
  </div>
</body>
</html>

h1 {
  font-size: 2.5em;
  font-weight: 700;
  text-align: center;
}

header > p {
  text-align: center;
  font-size: 1.5rem;
  font-weight: 700;
}

div {
  text-align: center;
  border: .1em solid #000;
}

p {
  font-size: 1.4rem;
  font-weight: 700;
}

body {
  background-color: #000;
  color: #FFF;
}

let span = document.querySelector(".date_span");
let dateInputs = document.querySelectorAll("input");
dateInputs[1].valueAsDate = new Date();
function calculateElapse() {
  if(!isNaN(dateInputs[0].valueAsDate) && !isNaN(dateInputs[1].valueAsDate)) {
    span.textContent = ""+((dateInputs[1].valueAsDate - dateInputs[0].valueAsDate) / (24 * 60 * 60 * 1000)) + "day(s)";
  }
}
dateInputs.forEach(elements => elements.addEventListener("change", calculateElapse));

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