Clock

A Clock

<!DOCTYPE html>
<head>
  <meta charset="utf-8">
  <link href='https://fonts.googleapis.com/css?family=Roboto' rel='stylesheet' type='text/css'>
  <script src="https://cdnjs.cloudflare.com/ajax/libs/d3/3.5.5/d3.min.js"></script>
  <style>
    body { margin:0;position:fixed;top:0;right:0;bottom:0;left:0; font-family: 'Roboto', sans-serif;}
    svg { width: 100%; height: 100%; }
    #wrap{position: absolute; bottom: 10px; left: 446px;}
  </style>
</head>

<body>
  <div id="charts"></div>
  <div id="wrap">
    <span id="h"></span> :
  	<span id="m"></span> :
  	<span id="s"></span>
  </div>
</body>
<script>
  	var h, m, s
    var hx, hy, mx, my, sx, sy
  
    var margin = {top: 20, right: 10, bottom: 20, left: 10};
    var width = 960 - margin.left - margin.right;
    var height = 500 - margin.top - margin.bottom;
    var svg = d3.select("#charts").append("svg")
      .attr("width", width + margin.left + margin.right)
      .attr("height", height + margin.top + margin.bottom)
    .append("g")
      .attr("transform", "translate(" + margin.left + "," + margin.top + ")");
		
  	svg.append('circle')
    	.attr('r', 200)
    	.attr('cx', width/2)
    	.attr('cy', height/2)
      .style('fill', 'pink')
    
    svg.append('line')
      .attr('class', 'h')
      .attr('x1', width/2)
      .attr('x2', hx)
      .attr('y1', height/2)
      .attr('y2', hy)
    	.style('stroke', 'white')
    	.style('stroke-width', 8)
    
    svg.append('line')
    	.attr('class', 'm')
      .attr('x1', width/2)
      .attr('x2', mx)
      .attr('y1', height/2)
      .attr('y2', my)
    	.style('stroke', 'white')
      .style('stroke-width', 5)
       
    svg.append('line')
      .attr('class', 's')
      .attr('x1', width/2)
      .attr('x2', sx)
      .attr('y1', height/2)
      .attr('y2', sy)
    	.style('stroke', 'orange')
      .style('stroke-width', 2)
    
    svg.append('circle')
    	.attr('r', 10)
    	.attr('cx', width/2)
    	.attr('cy', height/2)
      .style('fill', 'white')
        
    function tick() {
      var today = new Date()
     	h = today.getHours()
      m = today.getMinutes()
      s = today.getSeconds()
      
      hx = Math.sin(Math.PI - h/24 * Math.PI * 2) * 120
      hy = Math.cos(Math.PI - h/24 * Math.PI * 2) * 120
      
      mx = Math.sin(Math.PI - m/60 * Math.PI * 2) * 180
      my = Math.cos(Math.PI - m/60 * Math.PI * 2) * 180
      
      sx = Math.sin(Math.PI - s/60 * Math.PI * 2) * 200
      sy = Math.cos(Math.PI - s/60 * Math.PI * 2) * 200
      
      d3.select('#h').html(h < 10 ? '0' + h : h)
      d3.select('#m').html(m < 10 ? '0' + m : m)
      d3.select('#s').html(s < 10 ? '0' + s : s)  
      
      d3.select('.h')
      	.attr('x2', hx + width / 2)
      	.attr('y2', hy + height / 2)
      d3.select('.m')
      	.attr('x2', mx + width / 2)
      	.attr('y2', my + height / 2)  
      d3.select('.s')
      	.attr('x2', sx + width / 2)
      	.attr('y2', sy + height / 2)      
    }

function loop(cb){
      requestAnimationFrame(function(){
        loop(cb)
      })
      cb()
    }

loop(tick)
  </script>

https://cdnjs.cloudflare.com/ajax/libs/d3/3.5.5/d3.min.js