feat(xo-web/backup): add warning regarding DST (#4056)

Fixes #4042

CHANGELOG.unreleased.md

@@ -3,6 +3,7 @@
 ### Enhancements
 
 - [Settings/remotes] Expose mount options field for SMB [#4063](https://github.com/vatesfr/xen-orchestra/issues/4063) (PR [#4067](https://github.com/vatesfr/xen-orchestra/pull/4067))
+- [Backup/Schedule] Add warning regarding DST when you add a schedule [#4042](https://github.com/vatesfr/xen-orchestra/issues/4042) (PR [#4056](https://github.com/vatesfr/xen-orchestra/pull/4056))
 
 ### Bug fixes
 

packages/xo-web/src/common/intl/messages.js

@@ -430,6 +430,8 @@ const messages = {
     'This will migrate this backup to a backup NG. This operation is not reversible. Do you want to continue?',
   runBackupNgJobConfirm: 'Are you sure you want to run {name} ({id})?',
   cancelJobConfirm: 'Are you sure you want to cancel {name} ({id})?',
+  scheduleDstWarning:
+    'If your country participates in DST, it is advised that you avoid scheduling jobs at the time of change. e.g. 2AM to 3AM for US.',
 
   // ------ New backup -----
   newBackupAdvancedSettings: 'Advanced settings',

packages/xo-web/src/common/scheduling.js

@@ -1,4 +1,5 @@
 import classNames from 'classnames'
+import Icon from 'icon'
 import PropTypes from 'prop-types'
 import React from 'react'
 import { createSchedule } from '@xen-orchestra/cron'
@@ -457,6 +458,9 @@ export default class Scheduler extends Component {
 
     return (
       <div className='card-block'>
+        <em>
+          <Icon icon='info' /> {_('scheduleDstWarning')}
+        </em>
         <Row>
           <Col largeSize={6}>
             <TimePicker