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Disabled Date/Time Ranges

This demo shows how to disable specific days, dates, and times when a user cannot schedule an appointment. In the demo, appointments are disabled for weekends, certain individual dates (e.g., May 25th), and the time period from 12:00pm to 1:00pm.

Backend API
/* eslint-disable func-style */ import React, { useCallback, useMemo, useState } from 'react'; import Scheduler, { SchedulerTypes } from 'devextreme-react/scheduler'; import notify from 'devextreme/ui/notify'; import { FormRef } from 'devextreme-react/form'; import { data, holidays } from './data.ts'; import Utils from './utils.ts'; import DataCell from './DataCell.tsx'; import DataCellMonth from './DataCellMonth.tsx'; import DateCell from './DateCell.tsx'; import TimeCell from './TimeCell.tsx'; const currentDate = new Date(2021, 3, 27); const views: SchedulerTypes.ViewType[] = ['workWeek', 'month']; const notifyDisableDate = () => { notify('Cannot create or move an appointment/event to disabled time/date regions.', 'warning', 1000); }; const applyDisableDatesToDateEditors = (form: ReturnType<FormRef['instance']>) => { const startDateEditor = form.getEditor('startDate'); startDateEditor?.option('disabledDates', holidays); const endDateEditor = form.getEditor('endDate'); endDateEditor?.option('disabledDates', holidays); }; const onAppointmentFormOpening = (e: SchedulerTypes.AppointmentFormOpeningEvent) => { if (e.appointmentData?.startDate) { const startDate = new Date(e.appointmentData.startDate); if (!Utils.isValidAppointmentDate(startDate)) { e.cancel = true; notifyDisableDate(); } applyDisableDatesToDateEditors(e.form); } }; const onAppointmentAdding = (e: SchedulerTypes.AppointmentAddingEvent) => { const isValidAppointment = Utils.isValidAppointment(e.component, e.appointmentData); if (!isValidAppointment) { e.cancel = true; notifyDisableDate(); } }; const onAppointmentUpdating = (e: SchedulerTypes.AppointmentUpdatingEvent) => { const isValidAppointment = Utils.isValidAppointment(e.component, e.newData); if (!isValidAppointment) { e.cancel = true; notifyDisableDate(); } }; const App = () => { const [currentView, setCurrentView] = useState<SchedulerTypes.ViewType>(views[0]); const DataCellComponent = useMemo(() => ( currentView === 'month' ? DataCellMonth : DataCell ), [currentView]); const onCurrentViewChange = useCallback((value) => setCurrentView(value), [setCurrentView]); const renderDateCell = useCallback((itemData) => ( <DateCell itemData={itemData} currentView={currentView} /> ), []); return ( <Scheduler dataSource={data} views={views} defaultCurrentDate={currentDate} currentView={currentView} onCurrentViewChange={onCurrentViewChange} height={730} showAllDayPanel={false} firstDayOfWeek={0} startDayHour={9} endDayHour={19} dataCellComponent={DataCellComponent} dateCellRender={renderDateCell} timeCellComponent={TimeCell} onAppointmentFormOpening={onAppointmentFormOpening} onAppointmentAdding={onAppointmentAdding} onAppointmentUpdating={onAppointmentUpdating} /> ); }; export default App;
/* eslint-disable func-style */ import React, { useCallback, useMemo, useState } from 'react'; import Scheduler from 'devextreme-react/scheduler'; import notify from 'devextreme/ui/notify'; import { data, holidays } from './data.js'; import Utils from './utils.js'; import DataCell from './DataCell.js'; import DataCellMonth from './DataCellMonth.js'; import DateCell from './DateCell.js'; import TimeCell from './TimeCell.js'; const currentDate = new Date(2021, 3, 27); const views = ['workWeek', 'month']; const notifyDisableDate = () => { notify( 'Cannot create or move an appointment/event to disabled time/date regions.', 'warning', 1000, ); }; const applyDisableDatesToDateEditors = (form) => { const startDateEditor = form.getEditor('startDate'); startDateEditor?.option('disabledDates', holidays); const endDateEditor = form.getEditor('endDate'); endDateEditor?.option('disabledDates', holidays); }; const onAppointmentFormOpening = (e) => { if (e.appointmentData?.startDate) { const startDate = new Date(e.appointmentData.startDate); if (!Utils.isValidAppointmentDate(startDate)) { e.cancel = true; notifyDisableDate(); } applyDisableDatesToDateEditors(e.form); } }; const onAppointmentAdding = (e) => { const isValidAppointment = Utils.isValidAppointment(e.component, e.appointmentData); if (!isValidAppointment) { e.cancel = true; notifyDisableDate(); } }; const onAppointmentUpdating = (e) => { const isValidAppointment = Utils.isValidAppointment(e.component, e.newData); if (!isValidAppointment) { e.cancel = true; notifyDisableDate(); } }; const App = () => { const [currentView, setCurrentView] = useState(views[0]); const DataCellComponent = useMemo( () => (currentView === 'month' ? DataCellMonth : DataCell), [currentView], ); const onCurrentViewChange = useCallback((value) => setCurrentView(value), [setCurrentView]); const renderDateCell = useCallback( (itemData) => ( <DateCell itemData={itemData} currentView={currentView} /> ), [], ); return ( <Scheduler dataSource={data} views={views} defaultCurrentDate={currentDate} currentView={currentView} onCurrentViewChange={onCurrentViewChange} height={730} showAllDayPanel={false} firstDayOfWeek={0} startDayHour={9} endDayHour={19} dataCellComponent={DataCellComponent} dateCellRender={renderDateCell} timeCellComponent={TimeCell} onAppointmentFormOpening={onAppointmentFormOpening} onAppointmentAdding={onAppointmentAdding} onAppointmentUpdating={onAppointmentUpdating} /> ); }; export default App;
import React from 'react'; import Utils from './utils.ts'; type DataCellProps = { className: string data: { startDate: Date; } }; const DataCell = (props: React.PropsWithChildren<DataCellProps>) => { const { startDate } = props.data; const isDinner = Utils.isDinner(startDate); let cssClasses = props.className || ''; if (Utils.isDisableDate(startDate)) { cssClasses += ' disable-date'; } else if (isDinner) { cssClasses += ' dinner'; } return ( <div className={cssClasses}> {props.children} </div> ); }; export default DataCell;
import React from 'react'; import DataCell from './DataCell.tsx'; type DataCellMonthProps = { data: { startDate: Date; }; }; const DataCellMonth = (props: DataCellMonthProps) => { const { startDate } = props.data; return ( <DataCell data={props.data} className='dx-scheduler-date-table-cell-text'> {startDate.getDate()} </DataCell> ); }; export default DataCellMonth;
import React from 'react'; import { SchedulerTypes } from 'devextreme-react/scheduler'; import Utils from './utils.ts'; interface DateCellProps { itemData: any; currentView: SchedulerTypes.ViewType; } const DateCell = (props: DateCellProps) => { const { currentView, date, text } = props.itemData; const isDisabled = currentView === 'month' ? Utils.isWeekend(date) : Utils.isDisableDate(date); return ( <div className={isDisabled ? 'disable-date' : undefined}> <div>{text}</div> </div> ); }; export default DateCell;
import React from 'react'; import Utils from './utils.ts'; type TimeCellProps = { data: { date: Date; text: string; }; }; const TimeCell = (props: TimeCellProps) => { const { date, text } = props.data; const isDinner = Utils.isDinner(date); const hasCoffeeCupIcon = Utils.hasCoffeeCupIcon(date); return ( <div className={isDinner ? 'dinner' : null}> {text} {hasCoffeeCupIcon && <div className='cafe' />} </div> ); }; export default TimeCell;
import React from 'react'; import ReactDOM from 'react-dom'; import App from './App.tsx'; ReactDOM.render( <App />, document.getElementById('app'), );
import { SchedulerTypes } from 'devextreme-react/scheduler'; export const dinnerTime = { from: 12, to: 13 }; export const holidays = [ new Date(2021, 3, 29), new Date(2021, 5, 6), ]; export const data: SchedulerTypes.Appointment[] = [ { text: 'Website Re-Design Plan', startDate: new Date(2021, 3, 26, 9, 30), endDate: new Date(2021, 3, 26, 11, 30), }, { text: 'Install New Router in Dev Room', startDate: new Date(2021, 3, 26, 13), endDate: new Date(2021, 3, 26, 14), }, { text: 'Approve Personal Computer Upgrade Plan', startDate: new Date(2021, 3, 27, 10), endDate: new Date(2021, 3, 27, 11), }, { text: 'Final Budget Review', startDate: new Date(2021, 3, 27, 13, 30), endDate: new Date(2021, 3, 27, 15), }, { text: 'New Brochures', startDate: new Date(2021, 3, 26, 15), endDate: new Date(2021, 3, 26, 16, 15), }, { text: 'Install New Database', startDate: new Date(2021, 3, 28, 9, 45), endDate: new Date(2021, 3, 28, 12), }, { text: 'Approve New Online Marketing Strategy', startDate: new Date(2021, 3, 28, 14, 30), endDate: new Date(2021, 3, 28, 16, 30), }, { text: 'Upgrade Personal Computers', startDate: new Date(2021, 3, 27, 15, 30), endDate: new Date(2021, 3, 27, 16, 45), }, { text: 'Prepare 2021 Marketing Plan', startDate: new Date(2021, 4, 3, 13), endDate: new Date(2021, 4, 3, 15), }, { text: 'Brochure Design Review', startDate: new Date(2021, 4, 4, 15, 30), endDate: new Date(2021, 4, 5), }, { text: 'Create Icons for Website', startDate: new Date(2021, 3, 30, 10), endDate: new Date(2021, 3, 30, 12), }, { text: 'Upgrade Server Hardware', startDate: new Date(2021, 3, 30, 16, 30), endDate: new Date(2021, 3, 30, 18), }, { text: 'Submit New Website Design', startDate: new Date(2021, 4, 5, 10), endDate: new Date(2021, 4, 5, 11, 30), }, { text: 'Launch New Website', startDate: new Date(2021, 3, 30, 14, 30), endDate: new Date(2021, 3, 30, 16, 10), }, ];
import { SchedulerTypes } from 'devextreme-react/scheduler'; import { dinnerTime, holidays } from './data.ts'; export default class Utils { static isHoliday(date: Date) { const localeDate = date.toLocaleDateString(); return holidays.filter((holiday) => holiday.toLocaleDateString() === localeDate).length > 0; } static isWeekend(date: Date) { const day = date.getDay(); return day === 0 || day === 6; } static isDisableDate(date: Date) { return Utils.isHoliday(date) || Utils.isWeekend(date); } static isDinner(date: Date) { const hours = date.getHours(); return hours >= dinnerTime.from && hours < dinnerTime.to; } static hasCoffeeCupIcon(date: Date) { const hours = date.getHours(); const minutes = date.getMinutes(); return hours === dinnerTime.from && minutes === 0; } static isValidAppointment(component: SchedulerTypes.AppointmentAddingEvent['component'], appointmentData: SchedulerTypes.AppointmentAddingEvent['appointmentData']) { const startDate = new Date(appointmentData.startDate); const endDate = new Date(appointmentData.endDate); const cellDuration = component.option('cellDuration'); return Utils.isValidAppointmentInterval(startDate, endDate, cellDuration); } static isValidAppointmentInterval(startDate: Date, endDate: Date, cellDuration: number) { const edgeEndDate = new Date(endDate.getTime() - 1); if (!Utils.isValidAppointmentDate(edgeEndDate)) { return false; } const durationInMs = cellDuration * 60 * 1000; const date = startDate; while (date <= endDate) { if (!Utils.isValidAppointmentDate(date)) { return false; } const newDateTime = date.getTime() + durationInMs - 1; date.setTime(newDateTime); } return true; } static isValidAppointmentDate(date: Date) { return !Utils.isHoliday(date) && !Utils.isDinner(date) && !Utils.isWeekend(date); } }
window.exports = window.exports || {}; window.config = { transpiler: 'ts', typescriptOptions: { module: 'system', emitDecoratorMetadata: true, experimentalDecorators: true, jsx: 'react', }, meta: { 'react': { 'esModule': true, }, 'typescript': { 'exports': 'ts', }, 'devextreme/time_zone_utils.js': { 'esModule': true, }, 'devextreme/localization.js': { 'esModule': true, }, 'devextreme/viz/palette.js': { 'esModule': true, }, }, paths: { 'npm:': 'https://unpkg.com/', }, defaultExtension: 'js', map: { 'ts': 'npm:plugin-typescript@4.2.4/lib/plugin.js', 'typescript': 'npm:typescript@4.2.4/lib/typescript.js', 'react': 'npm:react@17.0.2/umd/react.development.js', 'react-dom': 'npm:react-dom@17.0.2/umd/react-dom.development.js', 'prop-types': 'npm:prop-types@15.8.1/prop-types.js', 'rrule': 'npm:rrule@2.6.4/dist/es5/rrule.js', 'luxon': 'npm:luxon@1.28.1/build/global/luxon.min.js', 'es6-object-assign': 'npm:es6-object-assign@1.1.0', 'devextreme': 'npm:devextreme@24.1.3/cjs', 'devextreme-react': 'npm:devextreme-react@24.1.3/cjs', 'jszip': 'npm:jszip@3.10.1/dist/jszip.min.js', 'devextreme-quill': 'npm:devextreme-quill@1.7.1/dist/dx-quill.min.js', 'devexpress-diagram': 'npm:devexpress-diagram@2.2.8/dist/dx-diagram.js', 'devexpress-gantt': 'npm:devexpress-gantt@4.1.56/dist/dx-gantt.js', '@devextreme/runtime': 'npm:@devextreme/runtime@3.0.13', 'inferno': 'npm:inferno@7.4.11/dist/inferno.min.js', 'inferno-compat': 'npm:inferno-compat/dist/inferno-compat.min.js', 'inferno-create-element': 'npm:inferno-create-element@7.4.11/dist/inferno-create-element.min.js', 'inferno-dom': 'npm:inferno-dom/dist/inferno-dom.min.js', 'inferno-hydrate': 'npm:inferno-hydrate@7.4.11/dist/inferno-hydrate.min.js', 'inferno-clone-vnode': 'npm:inferno-clone-vnode/dist/inferno-clone-vnode.min.js', 'inferno-create-class': 'npm:inferno-create-class/dist/inferno-create-class.min.js', 'inferno-extras': 'npm:inferno-extras/dist/inferno-extras.min.js', 'devextreme-cldr-data': 'npm:devextreme-cldr-data@1.0.3', // SystemJS plugins 'plugin-babel': 'npm:systemjs-plugin-babel@0.0.25/plugin-babel.js', 'systemjs-babel-build': 'npm:systemjs-plugin-babel@0.0.25/systemjs-babel-browser.js', // Prettier 'prettier/standalone': 'npm:prettier@2.8.8/standalone.js', 'prettier/parser-html': 'npm:prettier@2.8.8/parser-html.js', }, packages: { 'devextreme': { defaultExtension: 'js', }, 'devextreme-react': { main: 'index.js', }, 'devextreme/events/utils': { main: 'index', }, 'devextreme/localization/messages': { format: 'json', defaultExtension: 'json', }, 'devextreme/events': { main: 'index', }, 'es6-object-assign': { main: './index.js', defaultExtension: 'js', }, }, packageConfigPaths: [ 'npm:@devextreme/*/package.json', 'npm:@devextreme/runtime@3.0.13/inferno/package.json', ], babelOptions: { sourceMaps: false, stage0: true, react: true, }, }; System.config(window.config);
import React from 'react'; import Utils from './utils.js'; const DataCell = (props) => { const { startDate } = props.data; const isDinner = Utils.isDinner(startDate); let cssClasses = props.className || ''; if (Utils.isDisableDate(startDate)) { cssClasses += ' disable-date'; } else if (isDinner) { cssClasses += ' dinner'; } return <div className={cssClasses}>{props.children}</div>; }; export default DataCell;
import React from 'react'; import DataCell from './DataCell.js'; const DataCellMonth = (props) => { const { startDate } = props.data; return ( <DataCell data={props.data} className="dx-scheduler-date-table-cell-text" > {startDate.getDate()} </DataCell> ); }; export default DataCellMonth;
import React from 'react'; import Utils from './utils.js'; const DateCell = (props) => { const { currentView, date, text } = props.itemData; const isDisabled = currentView === 'month' ? Utils.isWeekend(date) : Utils.isDisableDate(date); return ( <div className={isDisabled ? 'disable-date' : undefined}> <div>{text}</div> </div> ); }; export default DateCell;
import React from 'react'; import Utils from './utils.js'; const TimeCell = (props) => { const { date, text } = props.data; const isDinner = Utils.isDinner(date); const hasCoffeeCupIcon = Utils.hasCoffeeCupIcon(date); return ( <div className={isDinner ? 'dinner' : null}> {text} {hasCoffeeCupIcon && <div className="cafe" />} </div> ); }; export default TimeCell;
import { dinnerTime, holidays } from './data.js'; export default class Utils { static isHoliday(date) { const localeDate = date.toLocaleDateString(); return holidays.filter((holiday) => holiday.toLocaleDateString() === localeDate).length > 0; } static isWeekend(date) { const day = date.getDay(); return day === 0 || day === 6; } static isDisableDate(date) { return Utils.isHoliday(date) || Utils.isWeekend(date); } static isDinner(date) { const hours = date.getHours(); return hours >= dinnerTime.from && hours < dinnerTime.to; } static hasCoffeeCupIcon(date) { const hours = date.getHours(); const minutes = date.getMinutes(); return hours === dinnerTime.from && minutes === 0; } static isValidAppointment(component, appointmentData) { const startDate = new Date(appointmentData.startDate); const endDate = new Date(appointmentData.endDate); const cellDuration = component.option('cellDuration'); return Utils.isValidAppointmentInterval(startDate, endDate, cellDuration); } static isValidAppointmentInterval(startDate, endDate, cellDuration) { const edgeEndDate = new Date(endDate.getTime() - 1); if (!Utils.isValidAppointmentDate(edgeEndDate)) { return false; } const durationInMs = cellDuration * 60 * 1000; const date = startDate; while (date <= endDate) { if (!Utils.isValidAppointmentDate(date)) { return false; } const newDateTime = date.getTime() + durationInMs - 1; date.setTime(newDateTime); } return true; } static isValidAppointmentDate(date) { return !Utils.isHoliday(date) && !Utils.isDinner(date) && !Utils.isWeekend(date); } }
import React from 'react'; import ReactDOM from 'react-dom'; import App from './App.js'; ReactDOM.render(<App />, document.getElementById('app'));
export const dinnerTime = { from: 12, to: 13 }; export const holidays = [new Date(2021, 3, 29), new Date(2021, 5, 6)]; export const data = [ { text: 'Website Re-Design Plan', startDate: new Date(2021, 3, 26, 9, 30), endDate: new Date(2021, 3, 26, 11, 30), }, { text: 'Install New Router in Dev Room', startDate: new Date(2021, 3, 26, 13), endDate: new Date(2021, 3, 26, 14), }, { text: 'Approve Personal Computer Upgrade Plan', startDate: new Date(2021, 3, 27, 10), endDate: new Date(2021, 3, 27, 11), }, { text: 'Final Budget Review', startDate: new Date(2021, 3, 27, 13, 30), endDate: new Date(2021, 3, 27, 15), }, { text: 'New Brochures', startDate: new Date(2021, 3, 26, 15), endDate: new Date(2021, 3, 26, 16, 15), }, { text: 'Install New Database', startDate: new Date(2021, 3, 28, 9, 45), endDate: new Date(2021, 3, 28, 12), }, { text: 'Approve New Online Marketing Strategy', startDate: new Date(2021, 3, 28, 14, 30), endDate: new Date(2021, 3, 28, 16, 30), }, { text: 'Upgrade Personal Computers', startDate: new Date(2021, 3, 27, 15, 30), endDate: new Date(2021, 3, 27, 16, 45), }, { text: 'Prepare 2021 Marketing Plan', startDate: new Date(2021, 4, 3, 13), endDate: new Date(2021, 4, 3, 15), }, { text: 'Brochure Design Review', startDate: new Date(2021, 4, 4, 15, 30), endDate: new Date(2021, 4, 5), }, { text: 'Create Icons for Website', startDate: new Date(2021, 3, 30, 10), endDate: new Date(2021, 3, 30, 12), }, { text: 'Upgrade Server Hardware', startDate: new Date(2021, 3, 30, 16, 30), endDate: new Date(2021, 3, 30, 18), }, { text: 'Submit New Website Design', startDate: new Date(2021, 4, 5, 10), endDate: new Date(2021, 4, 5, 11, 30), }, { text: 'Launch New Website', startDate: new Date(2021, 3, 30, 14, 30), endDate: new Date(2021, 3, 30, 16, 10), }, ];
<!DOCTYPE html> <html lang="en"> <head> <title>DevExtreme Demo</title> <meta http-equiv="X-UA-Compatible" content="IE=edge" /> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=5.0" /> <link rel="stylesheet" type="text/css" href="https://cdn3.devexpress.com/jslib/24.1.3/css/dx.light.css" /> <link rel="stylesheet" type="text/css" href="styles.css" /> <script src="https://unpkg.com/core-js@2.6.12/client/shim.min.js"></script> <script src="https://unpkg.com/systemjs@0.21.3/dist/system.js"></script> <script type="text/javascript" src="config.js"></script> <script type="text/javascript"> System.import("./index.tsx"); </script> </head> <body class="dx-viewport"> <div class="demo-container"> <div id="app"></div> </div> </body> </html>
@-moz-document url-prefix() { .dx-scheduler-work-space-month .dx-scheduler-date-table-cell { position: relative; } .dx-scheduler-work-space-month .dx-scheduler-date-table-cell .disable-date { position: absolute; width: 100%; height: 100%; } } .disable-date, .dinner { height: 100%; width: 100%; } .disable-date { background-image: repeating-linear-gradient( 135deg, rgba(244, 67, 54, 0.1), rgba(244, 67, 54, 0.1) 4px, transparent 4px, transparent 9px ); color: #9b6467; } .dx-scheduler-header-panel-cell .disable-date { display: flex; flex-direction: column; justify-content: center; } .dx-theme-fluent .dx-scheduler-header-panel-cell .disable-date, .dx-theme-material .dx-scheduler-header-panel-cell .disable-date { flex-direction: row; align-items: flex-end; justify-content: initial; } .dinner { background: rgba(255, 193, 7, 0.2); } .dx-scheduler-time-panel-cell .dinner { color: rgba(255, 193, 7); font-weight: 400; background: transparent; } .dx-draggable { cursor: auto; } td.dx-scheduler-time-panel-cell .dinner .cafe { height: 200%; width: 100%; left: 50%; -webkit-mask: url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" height="24" viewBox="0 0 24 24" width="24"><path d="M0 0h24v24H0V0z" fill="none"/><path d="M20 3H4v10c0 2.21 1.79 4 4 4h6c2.21 0 4-1.79 4-4v-3h2c1.11 0 2-.9 2-2V5c0-1.11-.89-2-2-2zm0 5h-2V5h2v3zM4 19h16v2H4z"/></svg>'); -webkit-mask-repeat: no-repeat; -webkit-mask-position-y: 50%; -webkit-mask-position-x: 100%; margin-top: -4px; background-color: #ffc107; } .dx-scheduler-date-table-cell { padding: 0; opacity: 1; } @media all and (-ms-high-contrast: none) { td.dx-scheduler-time-panel-cell .dinner .cafe { background-color: transparent; } }

To implement this functionality in your application, follow the steps below:

  1. Implement custom date/time validation functions
    These functions should check whether a date or time is available. This demo includes the date/time validation functions listed below. In your application, they can be different.

    • isValidAppointment
      Prepares data and begins validation.
    • isValidAppointmentInterval
      Validates a date/time interval.
    • isValidAppointmentDate
      Calls the isHoliday, isWeekend, and isDinner functions.
    • isHoliday / isWeekend / isDinner
      Check whether a date/time interval is a holiday, a weekend, or dinner time.
  2. Validate appointments before they are created or updated
    Before an appointment is created or updated, the Scheduler executes the onAppointmentAdding and onAppointmentUpdating functions. Use them to start validation. If a date or time is invalid, cancel the creation or update. Implement the same logic in the onAppointmentFormOpening function so that users cannot open the appointment details form for a disabled date or time.

  3. Customize the appointment details form
    The appointment details form includes two calendars that allow users to select an appointment's start and end date/time. You should also disable dates in these calendars. Review the applyDisableDatesToDateEditors function to see how this is done. Call this function from onAppointmentFormOpening.

  4. Customize the timetable appearance
    Use templates to customize the appearance of data cells (dataCellTemplate), time cells (timeCellTemplate), and date cells (dateCellTemplate). In this demo, date cell customization is visible only in the Month view. To switch to this view, use the view switcher in the Scheduler's upper right corner.