[faceted search] multiple month date selection via facet - date range resolution of one month vs 1 year is insufficient It's difficult to find messages (or groups of messages) when one has only the choice of 1 month. being able to select a range of months would help greatly

What would the UI for this look like?

(In reply to aleth [:aleth] from comment #1) > What would the UI for this look like? Maybe a checkbox to enable multiselect and a button to execute? So that a click on a year or month would select it, not run it. Then you'd have to hit execute button If the backend can accomodate it of course. I don't know anything about the code.

The usual idiom in d3 visualizations would be "brushing". You would click and drag to create a selection range that could include multiple time periods. Usually this range window can then be dragged to be repositioned and/or has resize handles at both ends. It's more frequently done for line-graphs (usually with higher density data-points), but it could certainly work on a bar graph. The simplest implementation would be to not "zoom"/regenerate the chart, but you could also have it zoom. I think the underlying logic would be fine with that. See http://bl.ocks.org/mbostock/1667367 and the bottom graph for some idea of what I'm talking about.