Time-based binning?

[mbostock]

Related d3/d3-time#8.

[Fil]

see also https://observablehq.com/@d3/d3-bin-time-thresholds

[mbostock]

This works pretty well:

Plot.plot({
  marks: [
    Plot.rectY(selection, Plot.binX({y: "count"}, {
      x: "publish_time",
      thresholds: data => d3.utcDays(...d3.extent(data))
    }))
  ]
})

The bin transform could detect when the binned dimension is temporal (type inference). We could also support some shorthand for explicit time-based bins, e.g. “day” for days, or maybe passing in a d3 time interval?