Make an animated analog clock using canvas and JavaScript.

<!-- HTML -->
    <canvas id="canvas"></canvas>

    <!-- JavaScript -->
    <script>
        function clock(){
            var now = new Date();
            var ctx = document.getElementById('canvas').getContext('2d');
            ctx.save();
            ctx.clearRect(0,0,150,150);
            ctx.translate(75,75);
            ctx.scale(0.4,0.4);
            ctx.rotate(-Math.PI/2);
            ctx.strokeStyle = "black";
            ctx.fillStyle = "white";
            ctx.lineWidth = 8;
            ctx.lineCap = "round";

            // Hour marks
            ctx.save();
            for (var i=0;i<12;i++){
                ctx.beginPath();
                ctx.rotate(Math.PI/6);
                ctx.moveTo(100,0);
                ctx.lineTo(120,0);
                ctx.stroke();
            }
            ctx.restore();

            // Minute marks
            ctx.save();
            ctx.lineWidth = 5;
            for (i=0;i<60;i++){
                if (i%5!=0) {
                    ctx.beginPath();
                    ctx.moveTo(117,0);
                    ctx.lineTo(120,0);
                    ctx.stroke();
                }
                ctx.rotate(Math.PI/30);
            }
            ctx.restore();

            var sec = now.getSeconds();
            var min = now.getMinutes();
            var hr  = now.getHours();
            hr = hr>=12 ? hr-12 : hr;

            ctx.fillStyle = "black";

            // write Hours
            ctx.save();
            ctx.rotate( hr*(Math.PI/6) + (Math.PI/360)*min + (Math.PI/21600)*sec )
            ctx.lineWidth = 14;
            ctx.beginPath();
            ctx.moveTo(-20,0);
            ctx.lineTo(80,0);
            ctx.stroke();
            ctx.restore();

            // write Minutes
            ctx.save();
            ctx.rotate( (Math.PI/30)*min + (Math.PI/1800)*sec )
            ctx.lineWidth = 10;
            ctx.beginPath();
            ctx.moveTo(-28,0);
            ctx.lineTo(112,0);
            ctx.stroke();
            ctx.restore();

            // Write seconds
            ctx.save();
            ctx.rotate(sec * Math.PI/30);
            ctx.strokeStyle = "#D40000";
            ctx.fillStyle = "#D40000";
            ctx.lineWidth = 6;
            ctx.beginPath();
            ctx.moveTo(-30,0);
            ctx.lineTo(83,0);
            ctx.stroke();
            ctx.beginPath();
            ctx.arc(0,0,10,0,Math.PI*2,true);
            ctx.fill();
            ctx.beginPath();
            ctx.arc(95,0,10,0,Math.PI*2,true);
            ctx.stroke();
            ctx.fillStyle = "rgba(0,0,0,0)";
            ctx.arc(0,0,3,0,Math.PI*2,true);
            ctx.fill();
            ctx.restore();

            ctx.beginPath();
            ctx.lineWidth = 14;
            ctx.strokeStyle = '#325FA2';
            ctx.arc(0,0,142,0,Math.PI*2,true);
            ctx.stroke();

            ctx.restore();

            window.requestAnimationFrame(clock);
        }

        window.requestAnimationFrame(clock);
    </script>