Let’s create a clean, glowing digital clock that not only shows the time but also gives the user a greeting like “Good Morning” or “Good Night” — all using HTML, CSS, and JavaScript functions.

Great for learners who want to build real, visual projects while practicing function-based logic in JS.

🧱 Step 1: Create the HTML

We need two things on the screen: the clock and the greeting.

<!-- index.html -->
<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8" />
  <meta name="viewport" content="width=device-width, initial-scale=1.0" />
  <title>Digital Clock</title>
  <link rel="stylesheet" href="style.css" />
</head>
<body>
  <div class="clock-container">
    <div id="clock">00:00:00</div>
    <div id="greeting">Hello!</div>
  </div>

  <script src="script.js"></script>
</body>
</html>

🎨 Step 2: Style the Clock and Greeting with CSS

Let’s make it glow and center everything.

/* style.css */
body {
  margin: 0;
  padding: 0;
  background: #111;
  display: flex;
  justify-content: center;
  align-items: center;
  height: 100vh;
  font-family: 'Segoe UI', sans-serif;
}

.clock-container {
  background: #222;
  padding: 40px 60px;
  border-radius: 20px;
  box-shadow: 0 0 20px rgba(0, 255, 100, 0.5);
  text-align: center;
}

#clock {
  font-size: 4rem;
  color: #0f0;
  letter-spacing: 3px;
  text-shadow: 0 0 10px #0f0;
}

#greeting {
  margin-top: 10px;
  color: #fff;
  font-size: 1.5rem;
}

🧠 Step 3: Use JavaScript Functions for Time & Greeting

Let’s create reusable functions to:

  • Format the time
  • Get a greeting based on the hour
  • Update everything every second
// script.js

function updateClock() {
  const now = new Date();

  const hours = formatTime(now.getHours());
  const minutes = formatTime(now.getMinutes());
  const seconds = formatTime(now.getSeconds());

  document.getElementById('clock').textContent = `${hours}:${minutes}:${seconds}`;
  document.getElementById('greeting').textContent = getGreeting(now.getHours());
}

function formatTime(unit) {
  return unit < 10 ? '0' + unit : unit;
}

function getGreeting(hour) {
  if (hour < 12) return "Good Morning 🌅";
  if (hour < 17) return "Good Afternoon ☀️";
  if (hour < 21) return "Good Evening 🌇";
  return "Good Night 🌙";
}

setInterval(updateClock, 1000);
updateClock();

🔄 What’s Happening?

  • updateClock() fetches the current time and updates the clock and greeting.
  • formatTime() ensures we always have two digits (e.g., “08” not “8”).
  • getGreeting() returns a greeting emoji based on the current hour.

🎯 Result

You get something like this:

🕒 14:23:41  
☀️ Good Afternoon

And it updates every second, all with reusable JavaScript functions. Clean and smart!

🧪 Practice Questions

Test what you’ve learned:

  1. What does setInterval(updateClock, 1000) do exactly?
  2. Modify the clock to show time in 12-hour format with AM/PM.
  3. Add today’s date below the greeting in this format: Monday, May 26, 2025.
  4. Why do we call updateClock() immediately, before the interval starts?
  5. Change the greeting logic to use a switch statement instead of if...else.
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