DevExtreme jQuery - Time Zone Support
Appointments are displayed in the client time zone. The time-zone offset specified in the startDate or endDate is also taken into account (if there is any). You can force a time zone for an individual appointment via its startDateTimeZone and endDateTimeZone fields or for all appointments in the widget via its timeZone option. timeZone takes precedence over start/endDateTimeZone.
You can use the following formula to calculate an appointment's resulting time-zone offset:
`resultingOffset` = `timeZoneOffset` - `clientOffset` (or `embeddedOffset` if there is any)
where
timeZoneOffsetis the offset of the timeZone or start/endDateTimeZone.clientOffsetis the offset of the client side.embeddedOffsetis the offset specified in the start/endDate.
The calculated offset is then added to the date-time value.
For example, if the timeZone is "Europe/Berlin" (UTC offset +1), and the client is in Tokyo (UTC offset +9), the calculated offset is 1 - 9 = -8. The time of all appointments is shifted back 8 hours: the appointment that started at 2019-01-01T12:00:00 starts at 2019-01-01T04:00:00. The same applies when the time-zone offset is specified in the date-time value (2019-01-01T12:00:00+09:00), except that this offset is used instead of the client offset.
Add the following code to allow users to change an appointment's time zone:
jQuery
$(function() {
$("#schedulerContainer").dxScheduler({
// ...
onAppointmentFormOpening: function(e) {
e.form.itemOption("startDateTimeZone", { visible: true });
e.form.itemOption("endDateTimeZone", { visible: true });
}
});
})Angular
<dx-scheduler ...
(onAppointmentFormOpening)="showTimeZoneFields($event)">
</dx-scheduler>
import { Component } from '@angular/core';
@Component({
selector: 'app-root',
templateUrl: './app.component.html',
styleUrls: ['./app.component.css']
})
export class AppComponent {
showTimeZoneFields(e) {
e.form.itemOption("startDateTimeZone", { visible: true });
e.form.itemOption("endDateTimeZone", { visible: true });
}
}
import { BrowserModule } from '@angular/platform-browser';
import { NgModule } from '@angular/core';
import { AppComponent } from './app.component';
import { DxSchedulerModule } from 'devextreme-angular';
@NgModule({
declarations: [
AppComponent
],
imports: [
BrowserModule,
DxSchedulerModule
],
providers: [],
bootstrap: [AppComponent]
})
export class AppModule { }Vue
<template>
<DxScheduler ...
@appointment-form-opening="showTimeZoneFields"
/>
</template>
<script>
import 'devextreme/dist/css/dx.common.css';
import 'devextreme/dist/css/dx.light.css';
import DxScheduler from 'devextreme-vue/scheduler';
export default {
components: {
DxScheduler
},
data() {
return { /* ... */ }
},
methods: {
showTimeZoneFields: (e) => {
e.form.itemOption("startDateTimeZone", { visible: true });
e.form.itemOption("endDateTimeZone", { visible: true });
}
}
}
</script>React
import React from 'react';
import 'devextreme/dist/css/dx.common.css';
import 'devextreme/dist/css/dx.light.css';
import Scheduler from 'devextreme-react/scheduler';
class App extends React.Component {
render() {
return (
<Scheduler ...
onAppointmentFormOpening={this.showTimeZoneFields}
/>
);
}
showTimeZoneFields(e) {
e.form.itemOption("startDateTimeZone", { visible: true });
e.form.itemOption("endDateTimeZone", { visible: true });
}
}
export default App;To allow a user to change the widget's time zone, implement a select box as shown in the Time Zone Support demo.