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Format Tooltip in JavaScript Chart control

Using tooltipRender event, you can able to format the datetime value instead of rendered value.

To format the datetime value,please follow the steps below

Step 1:

By using tooltipRender event we can able to get the current point x value. Using this value to format the tooltip by using formatDate method.

The output will appear as follows,

Source
Preview
index.ts
index.html
import { Chart, LineSeries, DateTime,  ITooltipRenderEventArgs, DataLabel, Tooltip } from '@syncfusion/ej2-charts';
import { Internationalization } from '@syncfusion/ej2-base';
Chart.Inject(LineSeries, DateTime, DataLabel, Tooltip);
let chart: Chart = new Chart({

        //Initializing Primary X Axis
        primaryXAxis: {
            valueType: 'DateTime',
        },
        //Initializing Chart Series
        series: [
            {
                type: 'Line',
                dataSource: [
                    { x: new Date(2005, 0, 1), y: 21 }, { x: new Date(2006, 0, 1), y: 24 },
                    { x: new Date(2007, 0, 1), y: 30 }, { x: new Date(2008, 0, 1), y: 38 },
                    { x: new Date(2009, 0, 1), y: 54 }, { x: new Date(2010, 0, 1), y: 57 },
                ],
                xName: 'x', width: 2, marker: {
                  dataLabel : { visible: true },
                    visible: true,
                    width: 10,
                    height: 10
                },
                yName: 'y', name: 'Germany',
            }
        ],

       //Initializing Chart title
        title: 'Inflation - Consumer Price',
        tooltip: {enable: true},
        tooltipRender:(args: ITooltipRenderEventArgs) => {  //  To format the current point x value
        let intl: Internationalization = new Internationalization();
        let formattedString: string = intl.formatDate(new Date(args.point.x), { skeleton: 'yMd' });
        args.text = formattedString;
        };
    width:'650px',
    height: '350px'
},'#element');
<!DOCTYPE html>
<html lang="en">

<head>
    <title>EJ2 Animation</title>
    <meta charset="utf-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <meta name="description" content="Typescript UI Controls" />
    <meta name="author" content="Syncfusion" />
    <link href="http://npmci.syncfusion.com/packages/development/material.css" rel="stylesheet">
    <link href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css" rel="stylesheet">
    <script src="https://cdnjs.cloudflare.com/ajax/libs/systemjs/0.19.38/system.js"></script>
    <script src="systemjs.config.js"></script>
</head>

<body>
    <div id='loader'>Loading....</div>
    <div class="col-sm-8">
            <div class="row">
                <div class="col-sm-4">  
                  <div id='container'>
                    <div id='element'  style="width:350px; height:350px;float:left">
                    </div>
                    <label id="lbl"></label>
                  </div>
                </div>
                <div class="col-sm-4" style="width:200px; height:350px;float: right">
                  <div id='Grid'>
                  </div>
                </div>
            </div>
    </div>
</body> 
</html>