Highcharts: Dates Off By 1 Month -


i'm not sure what's going on, dates being displayed on axis , in tooltips month out. first date in data on chart in july shows in august , on. ideas? i've put code in jsfiddle (http://jsfiddle.net/z2vgl/1/) , below:

$(function () { $('#container').highcharts({     chart: {         type: 'spline'     },     title: {         text: ''     },     plotoptions: {         series: {             linewidth: 5,             marker: {                 fillcolor: '#ffffff',                 linewidth: 2,                 radius: 6,                 linecolor: null // inherit series             }         }     },     subtitle: {         text: ''     },     xaxis: {         type: 'datetime',         datetimelabelformats: { // don't display dummy year             month: '%e %b',             year: '%b'         }     },     yaxis: {         title: {             text: 'ability score (out of 100)',             style: {                 color: '#323a45',                 fontweight: 'bold'             }         },         min: 0     },     tooltip: {         formatter: function () {             return '<b>' + this.series.name + '</b><br/>' + highcharts.dateformat('%e %b', this.x) + ': ' + this.y;         }     },      series: [{         name: 'overall ability',         // define data points. series have dummy year         // of 1970/71 in order compared on same x axis. note         // in javascript, months start @ 0 january, 1 february etc.         data: [             [date.utc(2013, 07, 12), 50],             [date.utc(2013, 08, 13), 57.9474605576],             [date.utc(2013, 08, 14), 58.5667571154],             [date.utc(2013, 08, 15), 69.0590308869], ]      }, {         name: 'target',         data: [             [date.utc(2013, 07, 12), 80],             [date.utc(2013, 08, 13), 80],             [date.utc(2013, 08, 14), 80],             [date.utc(2013, 08, 15), 80],             /*                     [date.utc(2013,  0,  1), 80.0],                     [date.utc(2013,  1,  1), 80.0],                     [date.utc(2013,  2,  1), 80.0],                     [date.utc(2013,  3,  1), 80.0],                     [date.utc(2013,  4,  1), 80.0],                     [date.utc(2013,  5,  1), 80.0],                     [date.utc(2013,  6,  1), 80.0],                     [date.utc(2013,  7,  1), 80.0]                     */

], dashstyle: 'longdash', marker: { enabled: false } }]

});

});

thanks in advance.

as can see doc: mozilla js reference date utc

month integer between 0 , 11 representing month.

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