Datetime axis label in highcharts - highcharts

Question

I have this plot that I am getting the data form a MSSQL table in JSON format but the datetime axis labels shows only one point. The datetime format in the JSON is epoc format [1325397600000,1325484000000,1325570400000,1325656800000,1325743200000,1325829600000].
What possibly is the problem?
Here is the code I am using:
$(document).ready(function() {
var options = {
chart: {
renderTo: 'container',
type: 'line',
marginRight: 130,
marginBottom: 60
},
title: {
text: 'Pressure and Temperature',
x: -20 //center
},
subtitle: {
text: '',
x: -20
},
xAxis: {
categories: []
type: 'datetime',
},
yAxis: {
title: {
text: 'Temperature '
},
plotLines: [{
value: 0,
width: 1,
color: '#808080'
}]
},
tooltip: {
formatter: function() {
return '<b>'+ this.series.name +'</b><br/>'+
this.x +': '+ this.y;
}
},
legend: {
layout: 'vertical',
align: 'right',
verticalAlign: 'top',
x: -10,
y: 100,
borderWidth: 0
},
series: []
}
$.getJSON("data3.php", function(json) {
options.xAxis.categories = json[0]['data'];
options.series[0] = json[1];
options.series[1] = json[2];
chart = new Highcharts.Chart(options);
});
});

Answer 1

In these lines:
options.series[0] = json[1];
options.series[1] = json[2];
You try to add two series, but based on your JSON it meanas that you try to reference to one point for series, in other words your construction means:
options.series[0] = 1325397600000;
options.series[1] = 1325484000000;
I advice to familiar with correct series structure (data array included).
http://docs.highcharts.com/#preprocessing