time on valueAxis concept

HTML

<script type="text/javascript" src="http://www.amcharts.com/lib/3/amcharts.js"></script>
<script type="text/javascript" src="http://www.amcharts.com/lib/3/serial.js"></script>
<script type="text/javascript" src="http://www.amcharts.com/lib/3/themes/none.js"></script>
<div id="chartdiv"></div>	
<div id="chartdiv2"></div>

CSS

#chartdiv, #chartdiv2 {
	width	: 100%;
	height	: 350px;
}	

.bub1 {background:#00f;color:#0f0;}
.more_info {border-top:2px solid #fff;padding:6px 0;}

JavaScript

var b1 = new AmCharts.AmBalloon();
b1.textAlign="left";
b1.fillColor="#0077ff";

var miss_lines = [{
        "initialCategory": 5,
        "finalCategory": 5,
        "initialValue": 0,
        "finalValue": 24,
        "lineColor": "#ccc",
        "balloonText": "<span class='bub1'>Hi there<br>I'm balloon1</span>"//,
        //"balloon": b1
    },{
        "initialCategory": 6,
        "finalCategory": 6,
        "initialValue": 0,
        "finalValue": 12,
        "lineColor": "#ccc",
				"balloonText": "<span class='bub2'>Hi there<br>I'm balloon2</span>",
        "balloon": b1
    }];
var miss_lines2 = [{
        "initialCategory": 5,
        "finalCategory": 5,
        "initialValue": 0,
        "finalValue": 24,
        "lineColor": "#ccc"
    },{
        "initialCategory": 6,
        "finalCategory": 6,
        "initialValue": 0,
        "finalValue": 12,
        "lineColor": "#ccc"
    }];

var the_data = [{"date": "2014/05/14", "day":0, "value":11, "value2":19,"dot":0.7}, {"date": "2014/05/15", "day":1, "value":11, "value2":19}, {"date": "2014/05/16", "day":2, "value":12, "value2":19}, {"date": "2014/05/17", "day":3, "value":12, "value2":20,"dot":0.7}, {"date": "2014/05/18", "day":4, "value":12, "value2":19,"dot":0.7}, {"date": "2014/05/19", "day":5}, {"date": "2014/05/20", "day":6,  "value2":19}, {"date": "2014/05/21", "day":7, "value":12, "value2":21,"dot":1}, {"date": "2014/05/22", "day":8, "value":12, "value2":19}, {"date": "2014/05/23", "day":9, "value":9, "value2":19}, {"date": "2014/05/24", "day":10, "value":10, "value2":19}, {"date": "2014/05/25", "day":11, "value":11, "value2":18,"dot":1}, {"date": "2014/05/26", "day":12, "value":11, "value2":19,"dot":1}, {"date": "2014/05/27", "day":13, "value":11, "value2":19}, {"date": "2014/05/28", "day":14, "value":11, "value2":19}];

var the_data2 = [{"date": "2014/05/14", "day":0, "value":11, "value2":19}, {"date": "2014/05/15", "day":1, "value":11, "value2":19}, {"date": "2014/05/16", "day":2, "value":12,...