Allow user to set timezone

playwright/e2e/settings/preferences-user-settings-tab.spec.ts

@@ -17,6 +17,11 @@ limitations under the License.
 
 import { test, expect } from "../../element-web-test";
 
+test.use({
+    locale: "en-GB",
+    timezoneId: "Europe/London",
+});
+
 test.describe("Preferences user settings tab", () => {
     test.use({
         displayName: "Bob",
@@ -26,9 +31,9 @@ test.describe("Preferences user settings tab", () => {
         },
     });
 
-    test("should be rendered properly", async ({ app, user }) => {
+    test("should be rendered properly", async ({ app, page, user }) => {
+        page.setViewportSize({ width: 1024, height: 3300 });
         const tab = await app.settings.openUserSettings("Preferences");
-
         // Assert that the top heading is rendered
         await expect(tab.getByRole("heading", { name: "Preferences" })).toBeVisible();
         await expect(tab).toMatchScreenshot("Preferences-user-settings-tab-should-be-rendered-properly-1.png");
@@ -53,4 +58,19 @@ test.describe("Preferences user settings tab", () => {
         // Assert that the default value is rendered again
         await expect(languageInput.getByText("English")).toBeVisible();
     });
+
+    test("should be able to change the timezone", async ({ uut, user }) => {
+        // Check language and region setting dropdown
+        const timezoneInput = uut.locator(".mx_dropdownUserTimezone");
+        const timezoneValue = uut.locator("#mx_dropdownUserTimezone_value");
+        await timezoneInput.scrollIntoViewIfNeeded();
+        // Check the default value
+        await expect(timezoneValue.getByText("Browser default")).toBeVisible();
+        // Click the button to display the dropdown menu
+        await timezoneInput.getByRole("button", { name: "Set timezone" }).click();
+        // Select a different value
+        timezoneInput.getByRole("option", { name: /Africa\/Abidjan/ }).click();
+        // Check the new value
+        await expect(timezoneValue.getByText("Africa/Abidjan")).toBeVisible();
+    });
 });

res/css/components/views/settings/shared/_SettingsSubsection.pcss

@@ -64,4 +64,8 @@ limitations under the License.
         gap: var(--cpd-space-6x);
         margin-top: 0;
     }
+
+    .mx_SettingsSubsection_dropdown {
+        min-width: 360px;
+    }
 }

src/DateUtils.ts

@@ -19,6 +19,7 @@ limitations under the License.
 import { Optional } from "matrix-events-sdk";
 
 import { _t, getUserLanguage } from "./languageHandler";
+import { getUserTimezone } from "./TimezoneHandler";
 
 export const MINUTE_MS = 60000;
 export const HOUR_MS = MINUTE_MS * 60;
@@ -77,6 +78,7 @@ export function formatDate(date: Date, showTwelveHour = false, locale?: string):
             weekday: "short",
             hour: "numeric",
             minute: "2-digit",
+            timeZone: getUserTimezone(),
         }).format(date);
     } else if (now.getFullYear() === date.getFullYear()) {
         return new Intl.DateTimeFormat(_locale, {
@@ -86,6 +88,7 @@ export function formatDate(date: Date, showTwelveHour = false, locale?: string):
             day: "numeric",
             hour: "numeric",
             minute: "2-digit",
+            timeZone: getUserTimezone(),
         }).format(date);
     }
     return formatFullDate(date, showTwelveHour, false, _locale);
@@ -104,6 +107,7 @@ export function formatFullDateNoTime(date: Date, locale?: string): string {
         month: "short",
         day: "numeric",
         year: "numeric",
+        timeZone: getUserTimezone(),
     }).format(date);
 }
 
@@ -127,6 +131,7 @@ export function formatFullDate(date: Date, showTwelveHour = false, showSeconds =
         hour: "numeric",
         minute: "2-digit",
         second: showSeconds ? "2-digit" : undefined,
+        timeZone: getUserTimezone(),
     }).format(date);
 }
 
@@ -160,6 +165,7 @@ export function formatFullTime(date: Date, showTwelveHour = false, locale?: stri
         hour: "numeric",
         minute: "2-digit",
         second: "2-digit",
+        timeZone: getUserTimezone(),
     }).format(date);
 }
 
@@ -178,6 +184,7 @@ export function formatTime(date: Date, showTwelveHour = false, locale?: string):
         ...getTwelveHourOptions(showTwelveHour),
         hour: "numeric",
         minute: "2-digit",
+        timeZone: getUserTimezone(),
     }).format(date);
 }
 
@@ -285,6 +292,7 @@ export function formatFullDateNoDayNoTime(date: Date, locale?: string): string {
         year: "numeric",
         month: "numeric",
         day: "numeric",
+        timeZone: getUserTimezone(),
     }).format(date);
 }
 
@@ -354,6 +362,9 @@ export function formatPreciseDuration(durationMs: number): string {
  * @returns {string} formattedDate
  */
 export const formatLocalDateShort = (timestamp: number, locale?: string): string =>
-    new Intl.DateTimeFormat(locale ?? getUserLanguage(), { day: "2-digit", month: "2-digit", year: "2-digit" }).format(
-        timestamp,
-    );
+    new Intl.DateTimeFormat(locale ?? getUserLanguage(), {
+        day: "2-digit",
+        month: "2-digit",
+        year: "2-digit",
+        timeZone: getUserTimezone(),
+    }).format(timestamp);

src/TimezoneHandler.ts

@@ -0,0 +1,55 @@
+/*
+Copyright 2024 The Matrix.org Foundation C.I.C.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+import { SettingLevel } from "./settings/SettingLevel";
+import SettingsStore from "./settings/SettingsStore";
+
+export const USER_TIMEZONE_KEY = "userTimezone";
+
+/**
+ * Returning `undefined` ensure that if unset the browser default will be used in `DateTimeFormat`.
+ * @returns The user specified timezone or `undefined`
+ */
+export function getUserTimezone(): string | undefined {
+    const tz = SettingsStore.getValueAt(SettingLevel.DEVICE, USER_TIMEZONE_KEY);
+    return tz || undefined;
+}
+
+/**
+ * Set in the settings the given timezone
+ * @timezone
+ */
+export function setUserTimezone(timezone: string): Promise<void> {
+    return SettingsStore.setValue(USER_TIMEZONE_KEY, null, SettingLevel.DEVICE, timezone);
+}
+
+/**
+ * Return all the available timezones
+ */
+export function getAllTimezones(): string[] {
+    return Intl.supportedValuesOf("timeZone");
+}
+
+/**
+ * Return the current timezone in a short human readable way
+ */
+export function shortBrowserTimezone(): string {
+    return (
+        new Intl.DateTimeFormat(undefined, { timeZoneName: "short" })
+            .formatToParts(new Date())
+            .find((x) => x.type === "timeZoneName")?.value ?? "GMT"
+    );
+}

src/components/structures/RoomView.tsx

@@ -47,6 +47,7 @@ import { ViewRoomOpts } from "@matrix-org/react-sdk-module-api/lib/lifecycles/Ro
 
 import shouldHideEvent from "../../shouldHideEvent";
 import { _t } from "../../languageHandler";
+import * as TimezoneHandler from "../../TimezoneHandler";
 import { RoomPermalinkCreator } from "../../utils/permalinks/Permalinks";
 import ResizeNotifier from "../../utils/ResizeNotifier";
 import ContentMessages from "../../ContentMessages";
@@ -228,6 +229,7 @@ export interface IRoomState {
     lowBandwidth: boolean;
     alwaysShowTimestamps: boolean;
     showTwelveHourTimestamps: boolean;
+    userTimezone: string | undefined;
     readMarkerInViewThresholdMs: number;
     readMarkerOutOfViewThresholdMs: number;
     showHiddenEvents: boolean;
@@ -455,6 +457,7 @@ export class RoomView extends React.Component<IRoomProps, IRoomState> {
             lowBandwidth: SettingsStore.getValue("lowBandwidth"),
             alwaysShowTimestamps: SettingsStore.getValue("alwaysShowTimestamps"),
             showTwelveHourTimestamps: SettingsStore.getValue("showTwelveHourTimestamps"),
+            userTimezone: TimezoneHandler.getUserTimezone(),
             readMarkerInViewThresholdMs: SettingsStore.getValue("readMarkerInViewThresholdMs"),
             readMarkerOutOfViewThresholdMs: SettingsStore.getValue("readMarkerOutOfViewThresholdMs"),
             showHiddenEvents: SettingsStore.getValue("showHiddenEventsInTimeline"),
@@ -512,6 +515,9 @@ export class RoomView extends React.Component<IRoomProps, IRoomState> {
             SettingsStore.watchSetting("showTwelveHourTimestamps", null, (...[, , , value]) =>
                 this.setState({ showTwelveHourTimestamps: value as boolean }),
             ),
+            SettingsStore.watchSetting(TimezoneHandler.USER_TIMEZONE_KEY, null, (...[, , , value]) =>
+                this.setState({ userTimezone: value as string }),
+            ),
             SettingsStore.watchSetting("readMarkerInViewThresholdMs", null, (...[, , , value]) =>
                 this.setState({ readMarkerInViewThresholdMs: value as number }),
             ),

src/components/views/settings/tabs/user/PreferencesUserSettingsTab.tsx

@@ -15,12 +15,14 @@ See the License for the specific language governing permissions and
 limitations under the License.
 */
 
-import React, { useCallback, useEffect, useState } from "react";
+import React, { ReactElement, useCallback, useEffect, useState } from "react";
 
+import { NonEmptyArray } from "../../../../../@types/common";
 import { _t, getCurrentLanguage } from "../../../../../languageHandler";
 import { UseCase } from "../../../../../settings/enums/UseCase";
 import SettingsStore from "../../../../../settings/SettingsStore";
 import Field from "../../../elements/Field";
+import Dropdown from "../../../elements/Dropdown";
 import { SettingLevel } from "../../../../../settings/SettingLevel";
 import SettingsFlag from "../../../elements/SettingsFlag";
 import AccessibleButton from "../../../elements/AccessibleButton";
@@ -38,12 +40,16 @@ import PlatformPeg from "../../../../../PlatformPeg";
 import { IS_MAC } from "../../../../../Keyboard";
 import SpellCheckSettings from "../../SpellCheckSettings";
 import LabelledToggleSwitch from "../../../elements/LabelledToggleSwitch";
+import * as TimezoneHandler from "../../../../../TimezoneHandler";
 
 interface IProps {
     closeSettingsFn(success: boolean): void;
 }
 
 interface IState {
+    timezone: string | undefined;
+    timezones: string[];
+    timezoneSearch: string | undefined;
     autocompleteDelay: string;
     readMarkerInViewThresholdMs: string;
     readMarkerOutOfViewThresholdMs: string;
@@ -68,7 +74,7 @@ const LanguageSection: React.FC = () => {
     );
 
     return (
-        <div className="mx_SettingsSubsection_contentStretch">
+        <div className="mx_SettingsSubsection_dropdown">
             {_t("settings|general|application_language")}
             <LanguageDropdown onOptionChange={onLanguageChange} value={language} />
             <div className="mx_PreferencesUserSettingsTab_section_hint">
@@ -173,6 +179,9 @@ export default class PreferencesUserSettingsTab extends React.Component<IProps,
         super(props);
 
         this.state = {
+            timezone: TimezoneHandler.getUserTimezone(),
+            timezones: TimezoneHandler.getAllTimezones(),
+            timezoneSearch: undefined,
             autocompleteDelay: SettingsStore.getValueAt(SettingLevel.DEVICE, "autocompleteDelay").toString(10),
             readMarkerInViewThresholdMs: SettingsStore.getValueAt(
                 SettingLevel.DEVICE,
@@ -185,6 +194,25 @@ export default class PreferencesUserSettingsTab extends React.Component<IProps,
         };
     }
 
+    private onTimezoneChange = (tz: string): void => {
+        this.setState({ timezone: tz });
+        TimezoneHandler.setUserTimezone(tz);
+    };
+
+    /**
+     * If present filter the time zones matching the search term
+     */
+    private onTimezoneSearchChange = (search: string): void => {
+        const timezoneSearch = search.toLowerCase();
+        const timezones = timezoneSearch
+            ? TimezoneHandler.getAllTimezones().filter((tz) => {
+                  return tz.toLowerCase().includes(timezoneSearch);
+              })
+            : TimezoneHandler.getAllTimezones();
+
+        this.setState({ timezones, timezoneSearch });
+    };
+
     private onAutocompleteDelayChange = (e: React.ChangeEvent<HTMLInputElement>): void => {
         this.setState({ autocompleteDelay: e.target.value });
         SettingsStore.setValue("autocompleteDelay", null, SettingLevel.DEVICE, e.target.value);
@@ -217,6 +245,16 @@ export default class PreferencesUserSettingsTab extends React.Component<IProps,
             // Only show the user onboarding setting if the user should see the user onboarding page
             .filter((it) => it !== "FTUE.userOnboardingButton" || showUserOnboardingPage(useCase));
 
+        const browserTimezoneLabel: string = _t("settings|preferences|default_timezone", {
+            timezone: TimezoneHandler.shortBrowserTimezone(),
+        });
+
+        // Always Preprend the default option
+        const timezones = this.state.timezones.map((tz) => {
+            return <div key={tz}>{tz}</div>;
+        });
+        timezones.unshift(<div key="">{browserTimezoneLabel}</div>);
+
         return (
             <SettingsTab data-testid="mx_PreferencesUserSettingsTab">
                 <SettingsSection>
@@ -254,6 +292,23 @@ export default class PreferencesUserSettingsTab extends React.Component<IProps,
                     </SettingsSubsection>
 
                     <SettingsSubsection heading={_t("settings|preferences|time_heading")}>
+                        <div className="mx_SettingsSubsection_dropdown">
+                            {_t("settings|preferences|user_timezone")}
+                            <Dropdown
+                                id="mx_dropdownUserTimezone"
+                                className="mx_dropdownUserTimezone"
+                                data-testid="mx_dropdownUserTimezone"
+                                searchEnabled={true}
+                                value={this.state.timezone}
+                                label={_t("settings|preferences|user_timezone")}
+                                placeholder={browserTimezoneLabel}
+                                onOptionChange={this.onTimezoneChange}
+                                onSearchChange={this.onTimezoneSearchChange}
+                            >
+                                {timezones as NonEmptyArray<ReactElement & { key: string }>}
+                            </Dropdown>
+                        </div>
+
                         {this.renderGroup(PreferencesUserSettingsTab.TIME_SETTINGS)}
                     </SettingsSubsection>
 

src/contexts/RoomContext.ts

@@ -55,6 +55,7 @@ const RoomContext = createContext<
     lowBandwidth: false,
     alwaysShowTimestamps: false,
     showTwelveHourTimestamps: false,
+    userTimezone: undefined,
     readMarkerInViewThresholdMs: 3000,
     readMarkerOutOfViewThresholdMs: 30000,
     showHiddenEvents: false,

src/i18n/strings/en_EN.json

@@ -2703,6 +2703,7 @@
             "code_blocks_heading": "Code blocks",
             "compact_modern": "Use a more compact 'Modern' layout",
             "composer_heading": "Composer",
+            "default_timezone": "Browser default (%(timezone)s)",
             "dialog_title": "<strong>Settings:</strong> Preferences",
             "enable_hardware_acceleration": "Enable hardware acceleration",
             "enable_tray_icon": "Show tray icon and minimise window to it on close",
@@ -2718,7 +2719,8 @@
             "show_checklist_shortcuts": "Show shortcut to welcome checklist above the room list",
             "show_polls_button": "Show polls button",
             "surround_text": "Surround selected text when typing special characters",
-            "time_heading": "Displaying time"
+            "time_heading": "Displaying time",
+            "user_timezone": "Set timezone"
         },
         "prompt_invite": "Prompt before sending invites to potentially invalid matrix IDs",
         "replace_plain_emoji": "Automatically replace plain text Emoji",

src/settings/Settings.tsx

@@ -649,6 +649,11 @@ export const SETTINGS: { [setting: string]: ISetting } = {
         displayName: _td("settings|always_show_message_timestamps"),
         default: false,
     },
+    "userTimezone": {
+        supportedLevels: LEVELS_DEVICE_ONLY_SETTINGS,
+        displayName: _td("settings|preferences|user_timezone"),
+        default: "",
+    },
     "autoplayGifs": {
         supportedLevels: LEVELS_ACCOUNT_SETTINGS,
         displayName: _td("settings|autoplay_gifs"),