Monday-based Calendar

An example adaption of D3’s calendar-view using weeks that start on Monday. The only change is the definition of the day number and week number methods. For a Sunday-based week, use:

var day = function(d) { return d.getDay(); },
    week = d3.time.format("%U");

For a Monday-based week, use:

var day = function(d) { return (d.getDay() + 6) % 7; },
    week = d3.time.format("%W");

<!DOCTYPE html>
<meta charset="utf-8">
<style>

@import url(//d3js.org/colorbrewer.v1.css);

svg {
  font: 10px sans-serif;
}

.day {
  fill: #fff;
  stroke: #ccc;
}

.month {
  fill: none;
  stroke: #000;
  stroke-width: 2px;
}

</style>
<body>
<script src="//d3js.org/d3.v3.min.js"></script>
<script>

var margin = {top: 5.5, right: 0, bottom: 5.5, left: 19.5},
    width = 960 - margin.left - margin.right,
    height = 130 - margin.top - margin.bottom,
    size = height / 7;

var day = function(d) { return (d.getDay() + 6) % 7; }, // monday = 0
    week = d3.time.format("%W"), // monday-based week number
    date = d3.time.format("%Y-%m-%d"),
    percent = d3.format("+.1%");

var color = d3.scale.quantize()
    .domain([-.05, .05])
    .range(d3.range(9));

var svg = d3.select("body").selectAll("svg")
    .data(d3.range(1990, 2011))
  .enter().append("svg")
    .attr("class", "RdYlGn")
    .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("text")
    .attr("transform", "translate(-6," + size * 3.5 + ")rotate(-90)")
    .attr("text-anchor", "middle")
    .text(function(d) { return d; });

rect.append("title")
    .text(function(d) { return d; });

svg.selectAll(".month")
    .data(function(d) { return d3.time.months(new Date(d, 0, 1), new Date(d + 1, 0, 1)); })
  .enter().append("path")
    .attr("class", "month")
    .attr("d", monthPath);

d3.csv("dji.csv", function(csv) {
  var data = d3.nest()
    .key(function(d) { return d.Date; })
    .rollup(function(d) { return (d[0].Close - d[0].Open) / d[0].Open; })
    .map(csv);

rect.filter(function(d) { return d in data; })
      .attr("class", function(d) { return "day q" + color(data[d]) + "-9"; })
    .select("title")
      .text(function(d) { return d + ": " + percent(data[d]); });
});

function monthPath(t0) {
  var t1 = new Date(t0.getFullYear(), t0.getMonth() + 1, 0),
      d0 = +day(t0), w0 = +week(t0),
      d1 = +day(t1), w1 = +week(t1);
  return "M" + (w0 + 1) * size + "," + d0 * size
      + "H" + w0 * size + "V" + 7 * size
      + "H" + w1 * size + "V" + (d1 + 1) * size
      + "H" + (w1 + 1) * size + "V" + 0
      + "H" + (w0 + 1) * size + "Z";
}

</script>

https://d3js.org/d3.v3.min.js