jquery - Invalid dates in Highcharts with data loaded by JSON -


i cannot seem xaxis in highcharts display date data loaded via json. also, when hover on data point, label says "invalid date."

here php code used generate data:

function fetchlinechart() {     $fetchdata = $this->db->query("select download, upload, date speed_entries order date desc");      while ($data = $fetchdata->fetch()) {         $date = date("y, m, d", strtotime($data['date']));         $downloaddata[] = array('date.utc(' . $date . ')', (float)$data['download']);         $uploaddata[] = array('date.utc(' . $date . ')', (float)$data['upload']);     }     $result = array('download' => $downloaddata, 'upload' => $uploaddata);     echo json_encode($result); }

and here jquery chart

$(document).ready(function() {                 var options = {                     chart: {                         renderto: 'linechart',                         type: 'line'                     },                     title: {                         text: 'download / upload results'                     },                     subtitle: {                         text: 'source: speedtest.net'                     },                     yaxis: {                             title: {                                     text: 'speed'                             },                             plotlines: [{                                     value: 0,                                     width: 1,                                     color: '#808080'                             }]                     },                     xaxis: {                         type: 'datetime'                      },                     series: [{                         name: 'download',                         linewidth: 2,                         marker: {                             radius: 2                         },                         data: []                     }, {                         name: 'upload',                         data: []                     }]                 };                  $.getjson('class.speed.php?mode=linechart', null, function(json) {                     var downloads = json.download;                     var uploads = json.upload;                      options.series[0].data = downloads;                     options.series[1].data = uploads;                      chart = new highcharts.chart(options);                 });             });

everything else works, data lines displayed correctly. cannot figure out how make date work.

thanks

i might wrong here setting xaxis 'datetime', telling highcharts supply date in form of miliseconds (that integer) instead passing in string. why don't generate, linger suggested, miliseconds directly in php function?

$miliseconds = strtotime($data['date']) * 1000; $downloaddata[] = array($miliseconds, (float)$data['download'])

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