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Customize Day Header in JavaScript DateTimePicker control

You can change the format of the day that to be displayed in header using dayHeaderFormat property. By default, the format is Short.

You can find the possible formats on below.

Name Description
Short Sets the short format of day name (like Su ) in day header.
Narrow Sets the single character of day name (like S ) in day header.
Abbreviated Sets the min format of day name (like Sun ) in day header.
Wide Sets the long format of day name (like Sunday ) in day header.
Source
Preview
app.ts
index.html
import { DateTimePicker } from '@syncfusion/ej2-calendars';
import { DropDownList } from '@syncfusion/ej2-dropdowns';

// creates datetimepicker component
let datetimepickerObject: DateTimePicker = new DateTimePicker({
    dayHeaderFormat: "Short"
});
datetimepickerObject.appendTo('#element');

let formatLabel: DropDownList = new DropDownList({
        // set the height of the popup element
        popupHeight: '200px',
        // bind the change event
            change: (args: any) => {
                 datetimepickerObject.dayHeaderFormat = args.value;
            }
 });
 formatLabel.appendTo('#select');
<!DOCTYPE html>
<html lang="en">

<head>
    <title>Essential JS 2 DateTimePicker control</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="styles.css" rel="stylesheet" />
    <link href="//cdn.syncfusion.com/ej2/ej2-base/styles/material.css" rel="stylesheet" />
    <link href="//cdn.syncfusion.com/ej2/ej2-buttons/styles/material.css" rel="stylesheet" />
    <link href="//cdn.syncfusion.com/ej2/ej2-inputs/styles/material.css" rel="stylesheet" />
    <link href="//cdn.syncfusion.com/ej2/ej2-popups/styles/material.css" rel="stylesheet" />
    <link href="//cdn.syncfusion.com/ej2/ej2-calendars/styles/material.css" rel="stylesheet" />
    <link href="//cdn.syncfusion.com/ej2/ej2-dropdowns/styles/material.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 id='container'>
        <input id='element' />
    </div>
    <div id="format">
        <label class="custom-input-label">Header Format Types</label>
        <div id="wrapper">
            <select id="select" class="form-control">
                <option value="Short" selected>Short</option>
                <option value="Narrow">Narrow</option>
                <option value="Abbreviated">Abbreviated</option>
                <option value="Wide">Wide</option>
            </select>
        </div>
    </div>
</body>

</html>