First, for some reason I can't seem to get the yAxis to tickInterval on the 1st and 15th of each month.

Second, none of the data is correct. If you check out the series data and where the bars are on the graph there is some kind of monthly padding going on. Even the tooltip has the wrong dates.

ref: <http://jsfiddle.net/no1uknow/5hnBP/12/>

```
yAxis: {
            title: '',
            type: 'datetime',
            min: Date.UTC(2014, 9, 1),
            max: Date.UTC(2014, 12, 31),
            tickInterval: 1000 * 60 * 60 * 24 * 14, // two weeks
            //ticks: ['2014-10-01','2014-10-15','2014-11-01','2014-11-15','2014-12-01','2014-12-15','2015-01-01'],
            labels: {
                formatter: function() {
                    return Highcharts.dateFormat('%d-%b-%Y', this.value);
                }
            }
        }

```