grdw/index.html

## index.html
<!DOCTYPE html>
<html>
  <head>
    <title>Date of birth</title>
  </head>
  <body>
    <canvas id="canvas" width="200" height="200"></canvas>
    <form>
      <label>Date of birth</label>
      <input id="day" disabled="disabled" maxlength="2" name="date-of-birth-day"/>
      <input id="month" disabled="disabled" maxlength="2" name="date-of-birth-month"/>
      <input id="year" disabled="disabled" maxlength="4" name="date-of-birth-year"/>
      <button id="stop">Stop</button>
    </form>
    <style>
      input[name="date-of-birth-year"] {
          width: 40px;
      }
      input[name="date-of-birth-day"], input[name="date-of-birth-month"] {
          width: 20px;
      }
    </style>
    <script>
      const button = document.getElementById("stop");
      const day = document.getElementById("day");
      const month = document.getElementById("month");
      const year = document.getElementById("year");
      const canvas = document.getElementById("canvas");
      let ctx = canvas.getContext("2d");
      let radius = canvas.height / 2;
      let t = 0;
      setDate(t);

      let i = setInterval(function() {
          t += 1;
          setDate(t);
          drawClock();
      }, 1000);

      ctx.translate(radius, radius);
      radius = radius * 0.90

      button.addEventListener("click", function(e) {
          e.preventDefault();

          clearInterval(i);
      });

      function setDate(t) {
          const d = new Date(t * 1000);
          console.log(d);
          year.value = d.getFullYear();
          month.value = d.getMonth() + 1;
          day.value = d.getDate();
      }

      function drawClock() {
        drawFace(ctx, radius);
        drawNumbers(ctx, radius);
        drawTime(ctx, radius);
      }

      function drawFace(ctx, radius) {
        ctx.beginPath();
        ctx.arc(0, 0, radius, 0, 2*Math.PI);
        ctx.fillStyle = 'white';
        ctx.fill();
        ctx.lineWidth = radius*0.1;
        ctx.stroke();
        ctx.beginPath();
        ctx.arc(0, 0, radius*0.1, 0, 2*Math.PI);
        ctx.fillStyle = '#333';
        ctx.fill();
      }

      function drawNumbers(ctx, radius) {
        var ang;
        var num;
        ctx.font = radius*0.15 + "px arial";
        ctx.textBaseline="middle";
        ctx.textAlign="center";
        for(num = 1; num < 13; num++){
          ang = num * Math.PI / 6;
          ctx.rotate(ang);
          ctx.translate(0, -radius*0.85);
          ctx.rotate(-ang);
          ctx.fillText(num.toString(), 0, 0);
          ctx.rotate(ang);
          ctx.translate(0, radius*0.85);
          ctx.rotate(-ang);
        }
      }

      function drawTime(ctx, radius){
          var now = new Date();
          var hour = now.getHours();
          var minute = now.getMinutes();
          var second = now.getSeconds();
          //hour
          hour=hour%12;
          hour=(hour*Math.PI/6)+
          (minute*Math.PI/(6*60))+
          (second*Math.PI/(360*60));
          drawHand(ctx, hour, radius*0.5, radius*0.07);
          //minute
          minute=(minute*Math.PI/30)+(second*Math.PI/(30*60));
          drawHand(ctx, minute, radius*0.8, radius*0.07);
          // second
          second=(second*Math.PI/30);
          drawHand(ctx, second, radius*0.9, radius*0.02);
      }

      function drawHand(ctx, pos, length, width) {
          ctx.beginPath();
          ctx.lineWidth = width;
          ctx.lineCap = "round";
          ctx.moveTo(0,0);
          ctx.rotate(pos);
          ctx.lineTo(0, -length);
          ctx.stroke();
          ctx.rotate(-pos);
      }
    </script>
  </body>
</html>
	<!DOCTYPE html>
	<html>
	<head>
	<title>Date of birth</title>
	</head>
	<body>
	<canvas id="canvas" width="200" height="200"></canvas>
	<form>
	<label>Date of birth</label>
	<input id="day" disabled="disabled" maxlength="2" name="date-of-birth-day"/>
	<input id="month" disabled="disabled" maxlength="2" name="date-of-birth-month"/>
	<input id="year" disabled="disabled" maxlength="4" name="date-of-birth-year"/>
	<button id="stop">Stop</button>
	</form>
	<style>
	input[name="date-of-birth-year"] {
	width: 40px;
	}
	input[name="date-of-birth-day"], input[name="date-of-birth-month"] {
	width: 20px;
	}
	</style>
	<script>
	const button = document.getElementById("stop");
	const day = document.getElementById("day");
	const month = document.getElementById("month");
	const year = document.getElementById("year");
	const canvas = document.getElementById("canvas");
	let ctx = canvas.getContext("2d");
	let radius = canvas.height / 2;
	let t = 0;
	setDate(t);

	let i = setInterval(function() {
	t += 1;
	setDate(t);
	drawClock();
	}, 1000);

	ctx.translate(radius, radius);
	radius = radius * 0.90

	button.addEventListener("click", function(e) {
	e.preventDefault();

	clearInterval(i);
	});

	function setDate(t) {
	const d = new Date(t * 1000);
	console.log(d);
	year.value = d.getFullYear();
	month.value = d.getMonth() + 1;
	day.value = d.getDate();
	}

	function drawClock() {
	drawFace(ctx, radius);
	drawNumbers(ctx, radius);
	drawTime(ctx, radius);
	}

	function drawFace(ctx, radius) {
	ctx.beginPath();
	ctx.arc(0, 0, radius, 0, 2*Math.PI);
	ctx.fillStyle = 'white';
	ctx.fill();
	ctx.lineWidth = radius*0.1;
	ctx.stroke();
	ctx.beginPath();
	ctx.arc(0, 0, radius0.1, 0, 2Math.PI);
	ctx.fillStyle = '#333';
	ctx.fill();
	}

	function drawNumbers(ctx, radius) {
	var ang;
	var num;
	ctx.font = radius*0.15 + "px arial";
	ctx.textBaseline="middle";
	ctx.textAlign="center";
	for(num = 1; num < 13; num++){
	ang = num * Math.PI / 6;
	ctx.rotate(ang);
	ctx.translate(0, -radius*0.85);
	ctx.rotate(-ang);
	ctx.fillText(num.toString(), 0, 0);
	ctx.rotate(ang);
	ctx.translate(0, radius*0.85);
	ctx.rotate(-ang);
	}
	}

	function drawTime(ctx, radius){
	var now = new Date();
	var hour = now.getHours();
	var minute = now.getMinutes();
	var second = now.getSeconds();
	//hour
	hour=hour%12;
	hour=(hour*Math.PI/6)+
	(minuteMath.PI/(660))+
	(secondMath.PI/(36060));
	drawHand(ctx, hour, radius0.5, radius0.07);
	//minute
	minute=(minuteMath.PI/30)+(secondMath.PI/(30*60));
	drawHand(ctx, minute, radius0.8, radius0.07);
	// second
	second=(second*Math.PI/30);
	drawHand(ctx, second, radius0.9, radius0.02);
	}

	function drawHand(ctx, pos, length, width) {
	ctx.beginPath();
	ctx.lineWidth = width;
	ctx.lineCap = "round";
	ctx.moveTo(0,0);
	ctx.rotate(pos);
	ctx.lineTo(0, -length);
	ctx.stroke();
	ctx.rotate(-pos);
	}
	</script>
	</body>
	</html>