Difference Between 2 Dates

<html lang="en">
  <head>
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>Difference Between 2 Dates</title>
    
    <link
      href="https://fonts.googleapis.com/css2?family=Rubik:wght@400;600&display=swap"
      rel="stylesheet"
    />
    
    <style>

* {
  padding: 0;
  margin: 0;
  box-sizing: border-box;
  font-family: "Rubik", sans-serif;
}
body {
  height: 100vh;
}
.container {
  width: 90vw;
  max-width: 37.5em;
  background-color: #242831;
  padding: 6em 3em;
  position: relative;
  transform: translate(-50%, -50%);
  top: 50%;
  left: 50%;
}
.inp-wrapper {
  display: flex;
  justify-content: space-around;
  gap: 1.2em;
}
label {
  color: #d5d5d5;
  display: block;
  font-weight: 600;
}
input[type="date"] {
  font-size: 16px;
  padding: 1em;
  color: #242831;
  border: none;
  outline: none;
  border-radius: 0.2em;
  margin-top: 0.6em;
}
::-webkit-calendar-picker-indicator {
  background-color: #18f08b;
  padding: 0.2em;
  cursor: pointer;
  border-radius: 0.1em;
}
button {
  display: block;
  background-color: #18f08b;
  color: #16191e;
  font-size: 18px;
  margin: 1em auto 2em auto;
  border: none;
  padding: 0.7em 2em;
  border-radius: 0.3em;
  font-weight: 600;
}

#output {
  background-color: rgba(255, 255, 255, 0.15);
  text-align: center;
  padding: 1em;
  color: #ffffff;
  font-size: 1.2em;
  letter-spacing: 0.05em;
}
#output span {
  color: #18f08b;
  font-size: 1.4em;
  font-weight: 600;
}
@media screen and (max-width: 550px) {
  .container {
    padding: 4em 2em;
  }
  .inp-wrapper {
    flex-direction: column;
  }
  .date-wrapper {
    display: flex;
    align-items: center;
    flex-direction: column;
  }
}

</style>
  </head>
  <body>
    <div class="container">
      <div class="inp-wrapper">
        <div class="date-wrapper">
          <label for="date-1">Start Date</label>
          <input type="date" id="date-1" />
        </div>
        <div class="date-wrapper">
          <label for="date-2">End Date</label>
          <input type="date" id="date-2" />
        </div>
      </div>
      <button id="submit">Submit</button>
      <div id="output">Select the dates to get started</div>
    </div>
    
    <script>

//Declaring and initializing variables
let submit = document.getElementById("submit");
let output = document.getElementById("output");

submit.addEventListener("click", () => {
  //Create a Date object from input value
  let date1 = new Date(document.getElementById("date-1").value);
  let date2 = new Date(document.getElementById("date-2").value);

//Check if the input dates are valid
  //If valid calculate the difference
  if (date1.getTime() && date2.getTime()) {
    //Calculate difference in time using getTime function
    //getTime calculates number of years since January 1,1970
    let timeDifference = date2.getTime() - date1.getTime();

//Since this value is in milliseconds we need to convert it into days
    //We want the difference to be a non-negative number. Hence we use Math.abs()
    let dayDifference = Math.abs(timeDifference / (1000 * 3600 * 24));
    output.innerHTML = `Difference between the two dates is <span>${dayDifference}</span> days`;
  }

//Else display that the input is valid
  else {
    output.innerHTML = "Please select a valid date";
  }
});

</script>
  </body>
</html>

demo

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Difference Between 2 Dates