Pull request: add etc timezones to the timezone list

Updates #6568

Squashed commit of the following:

commit cea0e91
Merge: 6f4a5b1 b42063e
Author: Ildar Kamalov <ik@adguard.com>
Date:   Thu Dec 28 13:40:47 2023 +0300

    Merge branch 'master' into ADG-7953

commit 6f4a5b1
Merge: c574e3f d75712b
Author: Ildar Kamalov <ik@adguard.com>
Date:   Wed Dec 27 16:29:53 2023 +0300

    Merge branch 'master' into ADG-7953

commit c574e3f
Author: Ildar Kamalov <ik@adguard.com>
Date:   Wed Dec 27 09:52:20 2023 +0300

    ADG-7953 add etc timezones to the timezones list

CHANGELOG.md

@@ -25,6 +25,7 @@ NOTE: Add new changes BELOW THIS COMMENT.
 
 ### Added
 
+- Etc timezones to the timezone list ([#6568]).
 - The schema version of the configuration file to the output of running
   `AdGuardHome` (or `AdGuardHome.exe) with `-v --version` command-line options
   ([#6545]).
@@ -75,6 +76,7 @@ NOTE: Add new changes BELOW THIS COMMENT.
 [#6534]: https://github.com/AdguardTeam/AdGuardHome/issues/6534
 [#6541]: https://github.com/AdguardTeam/AdGuardHome/issues/6541
 [#6545]: https://github.com/AdguardTeam/AdGuardHome/issues/6545
+[#6568]: https://github.com/AdguardTeam/AdGuardHome/issues/6568
 [#6584]: https://github.com/AdguardTeam/AdGuardHome/issues/6584
 
 <!--

client/package.json

@@ -16,6 +16,7 @@
         "@nivo/line": "^0.64.0",
         "axios": "^0.19.2",
         "classnames": "^2.2.6",
+        "countries-and-timezones": "^3.6.0",
         "date-fns": "^1.29.0",
         "i18next": "^19.6.2",
         "i18next-browser-languagedetector": "^4.2.0",
@@ -42,7 +43,6 @@
         "redux-actions": "^2.6.5",
         "redux-form": "^8.3.5",
         "redux-thunk": "^2.3.0",
-        "timezones-list": "^3.0.2",
         "url-polyfill": "^1.1.9"
     },
     "devDependencies": {

client/src/components/Filters/Services/ScheduleForm/Timezone.js

@@ -1,5 +1,5 @@
 import React from 'react';
-import timezones from 'timezones-list';
+import ct from 'countries-and-timezones';
 import { useTranslation } from 'react-i18next';
 import PropTypes from 'prop-types';
 
@@ -15,6 +15,8 @@ export const Timezone = ({
         setTimezone(event.target.value);
     };
 
+    const timezones = ct.getAllTimezones();
+
     return (
         <div className="schedule__timezone">
             <label className="form__label form__label--with-desc mb-2">
@@ -30,9 +32,9 @@ export const Timezone = ({
                     {t('schedule_timezone')}
                 </option>
                 {/* TODO: get timezones from backend method when the method is ready */}
-                {timezones.map((zone) => (
-                    <option key={zone.name} value={zone.tzCode}>
-                        {zone.label}
+                {Object.keys(timezones).map((zone) => (
+                    <option key={zone} value={zone}>
+                        {zone} (GMT{timezones[zone].utcOffsetStr})
                     </option>
                 ))}
             </select>