Highchart error with date values on xaxis - php

Question

I am trying to build a line chart but my highchart isn't rendering with the following code.
Could someone check what am I doing wrong?
$('#employee_chart').highcharts({
chart: {
type: 'line'
},
title: {
text: 'REPORTS AT A GLANCE (LAST 30 DAYS)'
},
xAxis: {
type: "datetime",
dateTimeLabelFormats: {
day: '%d'
},
tickInterval: 24 * 3600 * 1000,
min: Date.UTC(<?php echo date("Y, m, d",strtotime("-30 days"));?>),
max: Date.UTC(<?php echo date("Y, m, d");?>)
},
yAxis: {
title: {
text: 'Temperature (°C)'
}
},
plotOptions: {
line: {
dataLabels: {
enabled: true
},
enableMouseTracking: false
}
},
series: [{
name: 'Unique Logins',
data: [7, 6, 9, 14, 18, 21, 25, 26, 23, 18, 13, 9, 7, 6, 9, 14, 18, 21, 25, 26, 23, 18, 13, 9, 7, 6, 9, 14, 18, 21]
}]
});
Thank you

Answer 1

It seems you are missing pointStart which is cause of the issue.
pointStart :someDate
See Fiddle with similar issue when no pointStart
and Working fiddle when defined pointStart

Answer 2

The problem seems to be coming from your xaxis settings:
As you can see here your chart renders without these settings: http://jsfiddle.net/e4fru078/
tickInterval: 24 * 3600 * 1000,
min: Date.UTC(<?php echo date("Y, m, d",strtotime("-30 days"));?>),
max: Date.UTC(<?php echo date("Y, m, d");?>)
I would recommend to look into categories for your xaxis:
example here: http://jsfiddle.net/gh/get/jquery/1.7.2/highslide-software/highcharts.com/tree/master/samples/highcharts/chart/reflow-true/