gistfile1.txt

var prev = this._numeric_resolution;
var min = this.visibleDataExtent[0];

var range = this.visibleDataExtent[1] - this.visibleDataExtent[0];
this._resolution = this._findRes( range );
this._numeric_resolution = this._resolutions[this._resolution];

var counter = {};

this.bins.forEach(function(n,i) {
  var time = min + (i * prev);
  var index = new Date(time).getHours(); //Math.floor(time);
  if ( !counter[ index ] ) counter[ index ] = 0;
  counter[ index ] += n;
});

console.log('counter', counter);
var data = Object.keys(counter).map(function(k) { return counter[k] });
console.log(data)

this.bins = data;