score:2

Accepted answer

Here's mbostock code with year snapping. It just has a little bug for background bounds.

This code works fine except for a little flaw in background/brush element sync.

var margin = {top: 0, right: 40, bottom: 50, left: 40},
    width = 500 - margin.left - margin.right,
    height = 100 - margin.top - margin.bottom;
var x = d3.time.scale()
    .domain([new Date(2012, 1, 1), new Date(2023, 1, 1)])
    .range([0, width]);
var brush = d3.svg.brush()
    .x(x)
    .extent([new Date(2014, 1, 1), new Date(2015, 1, 1)])
    .on("brushend", brushended);
var svg = d3.select("body").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("rect")
    .attr("class", "grid-background")
    .attr("width", width)
    .attr("height", height);
svg.append("g")
    .attr("class", "x grid")
    .attr("transform", "translate(0," + height + ")")
    .call(d3.svg.axis()
        .scale(x)
        .orient("bottom")
        .ticks(d3.time.months, 6)
        .tickSize(-height)
        .tickFormat(""))
  .selectAll(".tick")
    .classed("minor", function(d) { return d.getHours(); });
svg.append("g")
    .attr("class", "x axis")
    .attr("transform", "translate(0," + height + ")")
    .call(d3.svg.axis()
      .scale(x)
      .orient("bottom")
      .ticks(d3.time.years)
      .tickPadding(0))
  .selectAll("text")
    .attr("x", 6)
    .style("text-anchor", null);
var gBrush = svg.append("g")
    .attr("class", "brush")
    .call(brush)
    .call(brush.event);
gBrush.selectAll("rect")
    .attr("height", height);
function brushended() {
  if (!d3.event.sourceEvent) return; // only transition after input
  var extent0 = brush.extent(),
      extent1 = extent0.map(d3.time.year.round);
  // if empty when rounded, use floor & ceil instead
  if (extent1[0] >= extent1[1]) {
    extent1[0] = d3.time.year.floor(extent0[0]);
    extent1[1] = d3.time.year.ceil(extent0[1]);
  }
  d3.select(this).transition()
      .call(brush.extent(extent1))
      .call(brush.event);
}
.axis text {
  font: 11px sans-serif;
}
.axis path {
  display: none;
}
.axis line {
  fill: none;
  stroke: #000;
  shape-rendering: crispEdges;
}
.grid-background {
  fill: #ddd;
}
.grid line,
.grid path {
  fill: none;
  stroke: #fff;
  shape-rendering: crispEdges;
}
.grid .minor.tick line {
  stroke-opacity: .5;
}
.brush .extent {
  stroke: #000;
  fill-opacity: .125;
  shape-rendering: crispEdges;
}
<script src="https://cdnjs.cloudflare.com/ajax/libs/d3/3.5.17/d3.js"></script>

<body>
</body>


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