Highcharts test tool

HTML

<script src="https://momentjs.com/downloads/moment.min.js"></script>
<script src="https://code.highcharts.com/highcharts.js"></script>

<div id="container"></div>

CSS

#container {
    min-width: 300px;
    max-width: 800px;
    height: 300px;
    margin: 1em auto;
}

JavaScript

Highcharts.chart('container', {
    xAxis: {
    	type: 'datetime'
    },
    series: [{
        data: [
        	[+moment('2019-01-01'), 1],
        	[+moment('2019-01-02'), 3],
        	[+moment('2019-01-03'), 2],
        	[+moment('2019-01-04'), 4]
        ]
    }]
});

console.log(+moment('2019-01-01'));