React Js Calculate Hours Between two Dates | Time Difference Between Two Dates

<!DOCTYPE html>
<html>

<body>
  <div id="app"></div>
  <script type="text/babel">
    const { useState } = React;

function App() {
      const [dateInputs, setDateInputs] = useState({
        startDate: '',
        endDate: '',
      });

const [timeDifference, setTimeDifference] = useState({
        hours: 0,
        minutes: 0,
      });

const calculateTimeDifference = () => {
        const startTime = new Date(dateInputs.startDate).getTime();
        const endTime = new Date(dateInputs.endDate).getTime();

if (isNaN(startTime) || isNaN(endTime)) {
          alert('Please enter valid start and end dates.');
          return;
        }

if (startTime >= endTime) {
          alert('End date and time must be after start date and time.');
          return;
        }

const timeDifference = Math.abs(endTime - startTime);
        const hours = Math.floor(timeDifference / (1000 * 60 * 60));
        const minutes = Math.floor((timeDifference % (1000 * 60 * 60)) / (1000 * 60));

setTimeDifference({ hours, minutes });
      };

const handleInputChange = (event) => {
        const { name, value } = event.target;
        setDateInputs({
          ...dateInputs,
          [name]: value,
        });
      };

return (
        <div className='container'>
          <h2>React Js Calculate Time Difference Between Two Dates</h2>
          <div>
            <label>Start Date and Time:</label>
            <input
              type="datetime-local"
              name="startDate"
              value={dateInputs.startDate}
              onChange={handleInputChange}
            />
          </div>
          <div>
            <label>End Date and Time:</label>
            <input
              type="datetime-local"
              name="endDate"
              value={dateInputs.endDate}
              onChange={handleInputChange}
            />
          </div>
          <button onClick={calculateTimeDifference}>Calculate</button>
          <div>
            {timeDifference.hours > 0 && (
              <p>
                Time Difference: {timeDifference.hours} hours, {timeDifference.minutes} minutes
              </p>
            )}
          </div>
        </div>
      );
    }

ReactDOM.render(<App />, document.getElementById("app"));
  </script>
  <style>
    .container {
      text-align: center;
      padding: 20px;
      box-shadow: 0 1px 2px 0 rgba(0, 0, 0, 0.12), 0 2px 4px 0 rgba(0, 0, 0, 0.24);
      margin: 0 auto;
      max-width: 600px;
    }

h2 {
      font-size: 24px;
      margin-bottom: 20px;
      color: #333;
    }

label {
      display: block;
      margin-bottom: 8px;
      color: #555;
    }

input[type="datetime-local"] {
      width: 100%;
      padding: 10px;
      border: 1px solid #ddd;
      border-radius: 4px;
      font-size: 16px;
      color: #333;
      box-sizing: border-box;
    }

button {
      background-color: #007bff;
      color: #fff;
      border: none;
      border-radius: 4px;
      padding: 10px 20px;
      font-size: 18px;
      cursor: pointer;
      transition: background-color 0.3s ease;
    }

button:hover {
      background-color: #0056b3;
    }

p {
      font-size: 18px;
      color: #333;
      margin-top: 10px;
    }
  </style>
</body>

</html>