create a web site that lets you input two dates and calculates the number of days between those two dates. in javascript

<form>
  <label for="startDate">Start Date:</label>
  <input type="date" id="startDate" name="startDate">

  <label for="endDate">End Date:</label>
  <input type="date" id="endDate" name="endDate">

  <button type="button" id="calculateBtn">Calculate Difference</button>
</form>
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index.tsx
document.getElementById('calculateBtn').addEventListener('click', function() {
  var startDate = new Date(document.getElementById('startDate').value);
  var endDate = new Date(document.getElementById('endDate').value);
  var timeDiff = endDate.getTime() - startDate.getTime();
  var daysDiff = Math.floor(timeDiff / (1000 * 3600 * 24));
  
  alert('The number of days between ' + startDate.toLocaleDateString() + ' and ' + endDate.toLocaleDateString() + ' is ' + daysDiff);
});
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index.tsx
document.getElementById('calculateBtn').addEventListener('click', function() {
  var startDate = new Date(document.getElementById('startDate').value);
  var endDate = new Date(document.getElementById('endDate').value);
  var timeDiff = endDate.getTime() - startDate.getTime();
  var daysDiff = Math.floor(timeDiff / (1000 * 3600 * 24));
  
  var resultElement = document.createElement('div');
  resultElement.textContent = 'The number of days between ' + startDate.toLocaleDateString() + ' and ' + endDate.toLocaleDateString() + ' is ' + daysDiff;
  
  document.body.appendChild(resultElement);
});
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