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Customize the Day Header in React Calendar component

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
index.tsx
// import the calendarcomponent
import { CalendarComponent} from '@syncfusion/ej2-react-calendars';
import { DropDownListComponent } from '@syncfusion/ej2-react-dropdowns';
import * as React from "react";
import * as ReactDOM from "react-dom";

export default class App extends React.Component<{}, {}> {
    public calendarObj: CalendarComponent;
    public floatLabelObj: DropDownListComponent;
    private floatData: { [key: string]: Object }[];
    private fields: object;
    private value: string = 'Short';
    constructor(props: {}) {
    super(props);
    this.floatData = [
      { Id: 'Short', Label: 'Short' },
      { Id: 'Narrow', Label: 'Narrow' },
      { Id: 'Abbreviated', Label: 'Abbreviated' },
      { Id: 'Wide', Label: 'Wide' }
    ];
    this.fields = { text: 'Label', value: 'Id' };
}
    private formatHandler(args: any): void {
        this.calendarObj.dayHeaderFormat = args.value;
}
    public render(): JSX.Element {
        return (
        <div id="container">
            <div id="calendar">
                <CalendarComponent ref={(calendar) => this.calendarObj = calendar} dayHeaderFormat="Short" />
            </div>
            <div id="format">
                <label class="custom-input-label">Header Format Types</label>
                <DropDownListComponent id="select" value = {this.value}  dataSource={this.floatData} ref={(dropdownlist) => { this.floatLabelObj = dropdownlist }} fields={this.fields} change={this.formatHandler.bind(this)} placeholder="Select float type" />
            </div>
         </div>
        );
    }
};
ReactDOM.render(<App />, document.getElementById('element'));