Time Zone Support

import React from 'react'; import Scheduler, { Editing } from 'devextreme-react/scheduler'; import SelectBox from 'devextreme-react/select-box'; import { data, locations } from './data.js'; import timeZoneUtils from 'devextreme/time_zone_utils'; const currentDate = new Date(2021, 4, 25); const views = ['workWeek']; function getLocations(date) { const timeZones = timeZoneUtils.getTimeZones(date); return timeZones.filter((timeZone) => { return locations.indexOf(timeZone.id) !== -1; }); } const demoLocations = getLocations(currentDate); class App extends React.Component { constructor(props) { super(props); this.state = { timeZone: demoLocations[0].id, demoLocations: demoLocations }; this.onValueChanged = this.onValueChanged.bind(this); this.onAppointmentFormOpening = this.onAppointmentFormOpening.bind(this); this.onOptionChanged = this.onOptionChanged.bind(this); } onValueChanged(e) { this.setState({ timeZone: e.value }); } onAppointmentFormOpening(e) { const form = e.form; const startDateTimezoneEditor = form.getEditor('startDateTimeZone'); const endDateTimezoneEditor = form.getEditor('endDateTimeZone'); const startDateDataSource = startDateTimezoneEditor.option('dataSource'); const endDateDataSource = endDateTimezoneEditor.option('dataSource'); startDateDataSource.filter(['id', 'contains', 'Europe']); endDateDataSource.filter(['id', 'contains', 'Europe']); startDateDataSource.load(); endDateDataSource.load(); } onOptionChanged(e) { if(e.name === 'currentDate') { this.setState({ demoLocations: getLocations(e.value) }); } } render() { const { timeZone, demoLocations } = this.state; return ( <React.Fragment> <div className="option"> <span>Office Time Zone</span> <SelectBox items={demoLocations} displayExpr="title" valueExpr="id" width={240} value={timeZone} onValueChanged={this.onValueChanged} /> </div> <Scheduler dataSource={data} views={views} defaultCurrentView="workWeek" startDayHour={8} defaultCurrentDate={currentDate} timeZone={timeZone} height={600} onAppointmentFormOpening={this.onAppointmentFormOpening} onOptionChanged={this.onOptionChanged} > <Editing allowTimeZoneEditing={true} /> </Scheduler> </React.Fragment> ); } } export default App;