columnrange with times

public Component getColumnRangeChart() throws ParseException {
	Chart chart = new Chart(ChartType.COLUMNRANGE);
	Configuration conf = chart.getConfiguration();
	conf.getChart().setInverted(true);
		
	YAxis yAxis = conf.getyAxis();
        yAxis.setTitle(new Title("Time"));
        yAxis.setType(AxisType.DATETIME);

        conf.getTooltip().setFormatter("return '<b>' + this.x + '</b> started at <b>' + Highcharts.dateFormat('%H:%M', 	this.point.low) + '</b> and ended at <b>' + Highcharts.dateFormat('%H:%M', this.point.high) + '</b>';");
        
        DataSeries data = new DataSeries();
        data.setName("Ranges");
        for (Date[] startEndPair : getRawData()) {
            DataSeriesItem item = new DataSeriesItem();
            item.setLow(startEndPair[0].getTime());
            item.setHigh(startEndPair[1].getTime());
            data.add(item);
        }
        conf.setSeries(data);
	return chart;
}
	
private List<Date[]> getRawData() throws ParseException {
	DateFormat df = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
	List<Date[]> dates = new ArrayList<Date[]>();
		
	Date start1 = df.parse("2015-19-03 09:00:00");
	Date end1 = df.parse("2015-19-03 09:30:00");
		
	Date start2 = df.parse("2015-19-03 08:15:00");
	Date end2 = df.parse("2015-19-03 11:30:00");
		
	dates.add(new Date[]{start1,end1});
	dates.add(new Date[]{start2,end2});
	
	return dates;
}