circular calendar

<!DOCTYPE html>
<head>
  <meta charset="utf-8">
  <script src="https://d3js.org/d3.v4.min.js"></script>
  <style>
    body { margin:0;position:fixed;top:0;right:0;bottom:0;left:0; }
    .inner { stroke: black; stroke-width: 2; }
    line { stroke: red; stroke-width: 2; }
    text { text-anchor: middle; font-size: 20px; font-family: sans-serif; font-weight: bold; }
    .special {
      fill: steelblue;
    }
    
    .DS {
      fill: green;
    }
    
    .N {
      fill: purple;
    }
    
    .S {
      fill: pink;
    }
    
    .march {
      fill: #f2f0dd;
      stroke: #f2f0dd;
    }
    .april {
      fill: #d8d29a;
      stroke: #d8d29a;
    }
    .may {
      fill: #aca243;
      stroke: #d8d29a;
    }
    
    .june {
      fill: #9bce9b;
      stroke: #9bce9b;
    }
    .july {
      fill: #4ea24e;
      stroke: #4ea24e;
    }
    .august {
      fill: #316731;
      stroke: #316731;
    }
    
    .september {
      fill: #dba498;
      stroke: #dba498;
    } 
    .october {
      fill: #c8715d;
      stroke: #c8715d;
    } 
    .november {
      fill: #974634;
      stroke: #974634;
    }
    
    .december {
      fill: #6bdaff;
      stroke: #6bdaff;
    }
    .january {
      fill: #00bfff;
      stroke: #00bfff;
    }
    .february {
      fill: #005b7a;
      stroke: #005b7a;
    }
    	
    .week {
      fill-opacity: 0.1;
    }
    
    .day {
      fill-opacity: 0.3;
      stroke: #adadad;
    }
    
    .monthText {
      fill: white;
      font-size: 20px;
      stroke: #3d3d3d;
      stroke-width: 1px;
      text-transform: capitalize;
    }
    
    text.middle {
      font-size: 120px;
      fill: #d3d3d3;
      stroke: #202020;
    }
  </style>
</head>

<body>
  <script>  
    var data = [
      { date: new Date().toString(), project: 'special', special: true},
 			{ date: '2017-04-21', project: 'DS'},
      { date: '2017-05-01', project: 'DS'},
      { date: '2017-06-01', project: 'N'},
      { date: '2017-08-01', project: 'N'},
      { date: '2017-05-01', project: 'N'},
      { date: '2017-05-31', project: 'N'},
      { date: '2017-07-01', project: 'N'},
      { date: '2017-06-01', project: 'S'},
    ];
    
    Date.prototype.isLeapYear = function() {
      var year = this.getFullYear();
      if((year & 3) != 0) return false;
      return ((year % 100) != 0 || (year % 400) == 0);
    };

// Get Day of Year
    Date.prototype.getDOY = function() {
        var dayCount = [0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334];
        var mn = this.getMonth();
        var dn = this.getDate();
        var dayOfYear = dayCount[mn] + dn;
        if(mn > 1 && this.isLeapYear()) dayOfYear++;
        return dayOfYear;
    };
    
    function doyToDegrees(doy) {
      return doy / 366 * 360;
    }
    
    function DegToRadians(degrees) {
      return degrees * Math.PI / 180 - Math.PI / 2;
    }
 
    var arcPosition = 200;
    
    var width = 800;
    var height = 800;
    
    var svg = d3.select("body").append("svg")
      .attr("width", width)
      .attr("height", height)
    
    function addArch(arc, className, classNameAsId) {
      const g = svg.append('g');
      const path = g.append('path')
        .attr('class', className)
        .attr('d', arc)
        .attr("transform", "translate(" + width / 2 + "," + height / 2 + ")");
      
      if (classNameAsId) {
      	path.attr('id', className.split(' ')[0]);
      }
    }
    
    function drawArc(start, end, innerPosition, outerPosition, className, classNameAsId) {
       var arc = d3.arc()
        .innerRadius(arcPosition + innerPosition)
        .outerRadius(arcPosition + outerPosition)
        .startAngle(DegToRadians(doyToDegrees(start)) + Math.PI / 2)
        .endAngle(DegToRadians(doyToDegrees(end)) + Math.PI / 2)
        
       addArch(arc, className, classNameAsId);
    }
    
    let seasons = [
      { className: 'march', start: '2017-03-01', end: '2017-04-01' },
      { className: 'april', start: '2017-04-01', end: '2017-05-01' },
      { className: 'may', start: '2017-05-01', end: '2017-06-01' },
      { className: 'june', start: '2017-06-01', end: '2017-07-01' },
      { className: 'july', start: '2017-07-01', end: '2017-08-01' },
      { className: 'august', start: '2017-08-01', end: '2017-09-01' },
      { className: 'september', start: '2017-09-01', end: '2017-10-01' },
      { className: 'october', start: '2017-10-01', end: '2017-11-01' },
      { className: 'november', start: '2017-11-01', end: '2017-12-01' },
      { className: 'december', start: '2017-12-01', end: '2017-12-31' },
      { className: 'january', start: '2017-01-01', end: '2017-02-01' },
      { className: 'february', start: '2017-02-01', end: '2017-03-01' },
    ];
    
    seasons = seasons.map(d => ({
      	className: d.className,
        start: new Date(d.start).getDOY(),
        end: new Date(d.end).getDOY(),
    }));
    
    let days = [];
    let weeks = []
   	for(let i = 1; i <= 366; i++) {
      const dayClassName = seasons.find(d => { 
          	return i >= d.start && i <= d.end + 1; 
        }).className;
      
      days[i-1] = { 
          data: i, 
          className: `${dayClassName} day`  ,
        }; 
      
      if (i%7 == 1) {
        const weekClassName = seasons.find(d => { 
          	return i >= d.start && i < d.end + 1; 
        }).className;
         
        weeks[weeks.length] = { 
          data: i, 
          className: `${weekClassName} week`  ,
        }; 
      }
    }
    
    days.forEach((d) => drawArc(d.data, d.data+1, 100, 150, d.className));
    weeks.forEach((d) => drawArc(d.data, d.data+7, 20, 100, d.className));
    seasons.forEach((d) => drawArc(
      d.start + (d.className === 'january' ? -1 : 0), 
      d.end + (d.className === 'december' ? 1 : 0),
      -10, 
      20, 
      `${d.className} season`, 
    	true));
    
    data.forEach((d) => {
      const startDate = new Date(d.date);
      const endDate = new Date(startDate.getTime());
      endDate.setDate(startDate.getDate() + 1);
      
      drawArc(
    		startDate.getDOY(),
        endDate.getDOY(),
        100,
        180 + (d.special ? 30 : 0),
        d.project
    	)});
    
    svg.selectAll('.monthText')
    	.data(seasons)
   		.enter()
      .append("text")
        .attr("class", "monthText")
        .attr("x", 58)   //Move the text from the start angle of the arc
        .attr("dy", '1.1em') //Move the text down
      .append("textPath")
        .attr("xlink:href", d => `#${d.className}`)
        .text(d => d.className.slice(0,3));	
    
    svg.append('text')
    	.classed('middle', true)
    	.attr("transform", "translate(" + width / 2 + "," + height / 2 + ")")
    	.attr("dy", "0.33em")
    	.text('2017')

</script>
</body>

https://d3js.org/d3.v4.min.js