Implement online board stale data timers

modern.config.ts

@@ -22,7 +22,13 @@ const plugins = [
 // '{z}/{x}/{y}', so we serialize the whole payload to base64 and decode
 // it in the browser at runtime. Base64 output is A-Z/a-z/0-9/+/=/ — no
 // braces for the template engine to grab.
-const PUBLIC_ENV_KEYS = ["MAP_TILE_URL", "API_BASE_URL", "SIGNALR_HUB_URL"] as const;
+const PUBLIC_ENV_KEYS = [
+  "MAP_TILE_URL",
+  "API_BASE_URL",
+  "SIGNALR_HUB_URL",
+  "REFRESH_PAUSE_MIN",
+  "REFRESH_STOP_MIN",
+] as const;
 const PUBLIC_ENV: Record<string, string> = {};
 for (const k of PUBLIC_ENV_KEYS) {
   const v = process.env[k];

src/env/index.ts

@@ -20,6 +20,8 @@ const EnvSchema = z.object({
   // skip the connection when blank so the browser does not emit CORS
   // errors for an unreachable placeholder host.
   SIGNALR_HUB_URL: z.string().default(""),
+  REFRESH_PAUSE_MIN: z.coerce.number().nonnegative().default(15),
+  REFRESH_STOP_MIN: z.coerce.number().nonnegative().default(60),
   OTEL_EXPORTER_OTLP_ENDPOINT: z.string().url().optional(),
   OTEL_EXPORTER_OTLP_HEADERS: z.string().optional(),
   LOGS_ENDPOINT: z.string().url().optional(),
@@ -45,6 +47,8 @@ export interface Env {
   PROD_ORIGIN: string;
   API_BASE_URL: string;
   SIGNALR_HUB_URL: string;
+  REFRESH_PAUSE_MIN: number;
+  REFRESH_STOP_MIN: number;
   OTEL_EXPORTER_OTLP_ENDPOINT?: string;
   OTEL_EXPORTER_OTLP_HEADERS?: string;
   LOGS_ENDPOINT?: string;
@@ -92,6 +96,8 @@ export function getEnv(): Env {
     PROD_ORIGIN: raw.PROD_ORIGIN,
     API_BASE_URL: raw.API_BASE_URL,
     SIGNALR_HUB_URL: raw.SIGNALR_HUB_URL,
+    REFRESH_PAUSE_MIN: raw.REFRESH_PAUSE_MIN,
+    REFRESH_STOP_MIN: raw.REFRESH_STOP_MIN,
     ANALYTICS_ENABLED: {
       metrica: raw.ANALYTICS_METRICA,
       ctm: raw.ANALYTICS_CTM,

src/features/online-board/components/OnlineBoardDetailsPage.tsx

@@ -18,6 +18,7 @@ import { PageLayout } from "@/ui/layout/PageLayout.js";
 import { useAppSettings } from "@/shared/hooks/useAppSettings.js";
 import { useFlightDetails } from "../hooks/useFlightDetails.js";
 import { useLiveFlightDetails } from "../hooks/useLiveFlightDetails.js";
+import { useStaleDataTimers } from "../hooks/useStaleDataTimers.js";
 import { useOnlineBoard } from "../hooks/useOnlineBoard.js";
 import { parseDetailsRequestParam } from "@/shared/detailsRequestParam.js";
 import { buildFlightJsonLd } from "../json-ld.js";
@@ -31,6 +32,7 @@ import { BoardDetailsHeader } from "./BoardDetailsHeader/index.js";
 import { DetailsBackButton } from "./DetailsBackButton/index.js";
 import { FlightSchedule } from "./FlightSchedule/index.js";
 import { FullRouteTimeline } from "./FullRouteTimeline/index.js";
+import { StaleDataOverlay } from "./StaleDataOverlay.js";
 import { TransferBar } from "./TransferBar/index.js";
 import type { IParsedFlightId, IFlightLeg, FlightStatus as FlightStatusType } from "../types.js";
 import {
@@ -403,6 +405,7 @@ export const OnlineBoardDetailsPage: FC<OnlineBoardDetailsPageProps> = ({
     flight,
     refresh,
   );
+  const isStale = useStaleDataTimers();
 
   const displayFlight = connectionStatus === "live" && liveFlight ? liveFlight : flight;
 
@@ -619,6 +622,9 @@ export const OnlineBoardDetailsPage: FC<OnlineBoardDetailsPageProps> = ({
   return (
     <>
       <JsonLdRenderer data={jsonLd} />
+      {isStale && (
+        <StaleDataOverlay message={t("SHARED.STALE-DATA-REFRESH")} />
+      )}
       <PageLayout
         headerLeft={<DetailsBackButton locale={locale} />}
         title={<h1 className="flight-details__flight-number">{pageTitle}</h1>}

src/features/online-board/components/OnlineBoardSearchPage.tsx

@@ -32,6 +32,7 @@ import "./OnlineBoardSearchPage.scss";
 import { JsonLdRenderer } from "@/shared/seo/json-ld.js";
 import { useOnlineBoard } from "../hooks/useOnlineBoard.js";
 import { useLiveBoardSearch } from "../hooks/useLiveBoardSearch.js";
+import { useStaleDataTimers } from "../hooks/useStaleDataTimers.js";
 import { useCalendarDays } from "../hooks/useCalendarDays.js";
 import { buildOnlineBoardUrl } from "../url.js";
 import { buildFlightListJsonLd } from "../json-ld.js";
@@ -41,6 +42,7 @@ import {
   PobedaAuroraBanner,
   shouldShowPobedaAuroraBanner,
 } from "./PobedaAuroraBanner.js";
+import { StaleDataOverlay } from "./StaleDataOverlay.js";
 import type { SortMode } from "../sortFlights.js";
 import type { OnlineBoardParams } from "../url.js";
 import type { SearchFlightsParams, CalendarParams } from "../api.js";
@@ -377,6 +379,7 @@ export const OnlineBoardSearchPage: FC<OnlineBoardSearchPageProps> = ({
     flights,
     refresh,
   );
+  const isStale = useStaleDataTimers();
 
   // Calendar days
   const calendarParams = toCalendarParams(params);
@@ -463,6 +466,9 @@ export const OnlineBoardSearchPage: FC<OnlineBoardSearchPageProps> = ({
       data-searching={loading ? "true" : undefined}
     >
       {jsonLd && <JsonLdRenderer data={jsonLd} />}
+      {isStale && (
+        <StaleDataOverlay message={t("SHARED.STALE-DATA-REFRESH")} />
+      )}
       <PageLayout
         headerLeft={<PageTabs viewType="onlineboard" />}
         title={

src/features/online-board/components/StaleDataOverlay.scss

@@ -0,0 +1,16 @@
+.stale-data-overlay {
+  position: fixed;
+  inset: 0;
+  z-index: 9999;
+  display: flex;
+  align-items: flex-start;
+  justify-content: center;
+  box-sizing: border-box;
+  padding: 20vh 24px 24px;
+  background: rgb(255 255 255 / 70%);
+  color: #111827;
+  font-size: 18px;
+  font-weight: 600;
+  line-height: 1.4;
+  text-align: center;
+}

src/features/online-board/components/StaleDataOverlay.tsx

@@ -0,0 +1,17 @@
+import type { FC } from "react";
+import "./StaleDataOverlay.scss";
+
+interface StaleDataOverlayProps {
+  message: string;
+}
+
+export const StaleDataOverlay: FC<StaleDataOverlayProps> = ({ message }) => (
+  <div
+    className="stale-data-overlay"
+    data-testid="stale-data-overlay"
+    role="alert"
+    aria-live="assertive"
+  >
+    {message}
+  </div>
+);

src/features/online-board/hooks/useStaleDataTimers.test.ts

@@ -0,0 +1,72 @@
+/**
+ * @vitest-environment jsdom
+ */
+import { renderHook, act } from "@testing-library/react";
+import { afterEach, beforeEach, describe, expect, it, vi } from "vitest";
+import { useStaleDataTimers } from "./useStaleDataTimers.js";
+
+describe("useStaleDataTimers", () => {
+  const originalLocation = window.location;
+  const assign = vi.fn();
+
+  beforeEach(() => {
+    vi.useFakeTimers();
+    assign.mockClear();
+    Object.defineProperty(window, "location", {
+      value: { assign, pathname: "/ru/onlineboard" },
+      writable: true,
+    });
+  });
+
+  afterEach(() => {
+    vi.useRealTimers();
+    Object.defineProperty(window, "location", {
+      value: originalLocation,
+      writable: true,
+    });
+  });
+
+  it("marks data stale after the pause timeout", () => {
+    const { result } = renderHook(() =>
+      useStaleDataTimers({ pauseMinutes: 0.001, stopMinutes: 1 }),
+    );
+
+    expect(result.current).toBe(false);
+
+    act(() => {
+      vi.advanceTimersByTime(60);
+    });
+
+    expect(result.current).toBe(true);
+  });
+
+  it("redirects after the stop timeout", () => {
+    renderHook(() =>
+      useStaleDataTimers({
+        pauseMinutes: 1,
+        stopMinutes: 0.001,
+        redirectTo: "/",
+      }),
+    );
+
+    act(() => {
+      vi.advanceTimersByTime(60);
+    });
+
+    expect(assign).toHaveBeenCalledWith("/");
+  });
+
+  it("clears timers on unmount", () => {
+    const { unmount } = renderHook(() =>
+      useStaleDataTimers({ pauseMinutes: 0.001, stopMinutes: 0.002 }),
+    );
+
+    unmount();
+
+    act(() => {
+      vi.advanceTimersByTime(120);
+    });
+
+    expect(assign).not.toHaveBeenCalled();
+  });
+});

src/features/online-board/hooks/useStaleDataTimers.ts

@@ -0,0 +1,40 @@
+import { useEffect, useState } from "react";
+import { getEnv } from "@/env/index.js";
+
+const MILLIS_PER_MINUTE = 60_000;
+
+export interface StaleDataTimersOptions {
+  pauseMinutes?: number;
+  stopMinutes?: number;
+  redirectTo?: string;
+}
+
+function toDelay(minutes: number): number {
+  return Math.max(0, minutes * MILLIS_PER_MINUTE);
+}
+
+export function useStaleDataTimers(options: StaleDataTimersOptions = {}): boolean {
+  const env = getEnv();
+  const pauseMinutes = options.pauseMinutes ?? env.REFRESH_PAUSE_MIN;
+  const stopMinutes = options.stopMinutes ?? env.REFRESH_STOP_MIN;
+  const redirectTo = options.redirectTo ?? "/";
+  const [stale, setStale] = useState(false);
+
+  useEffect(() => {
+    setStale(false);
+
+    const pauseTimer = window.setTimeout(() => {
+      setStale(true);
+    }, toDelay(pauseMinutes));
+    const stopTimer = window.setTimeout(() => {
+      window.location.assign(redirectTo);
+    }, toDelay(stopMinutes));
+
+    return () => {
+      window.clearTimeout(pauseTimer);
+      window.clearTimeout(stopTimer);
+    };
+  }, [pauseMinutes, redirectTo, stopMinutes]);
+
+  return stale;
+}

src/i18n/locales/de/common.json

@@ -392,6 +392,7 @@
     "CONNECTION-LIVE": "Live",
     "CONNECTION-RECONNECTING": "Reconnecting…",
     "CONNECTION-OFFLINE": "Offline",
+    "STALE-DATA-REFRESH": "Data is outdated, refresh the page.",
     "INVALID-PARAMS": "Invalid URL parameters.",
     "LOADING": "Loading…",
     "A11Y-PREV-PAGE": "Previous page",

src/i18n/locales/en/common.json

@@ -432,6 +432,7 @@
     "CONNECTION-LIVE": "Live",
     "CONNECTION-RECONNECTING": "Reconnecting…",
     "CONNECTION-OFFLINE": "Offline",
+    "STALE-DATA-REFRESH": "Data is outdated, refresh the page.",
     "INVALID-PARAMS": "Invalid URL parameters.",
     "LOADING": "Loading…",
     "A11Y-PREV-PAGE": "Previous page",

src/i18n/locales/es/common.json

@@ -392,6 +392,7 @@
     "CONNECTION-LIVE": "Live",
     "CONNECTION-RECONNECTING": "Reconnecting…",
     "CONNECTION-OFFLINE": "Offline",
+    "STALE-DATA-REFRESH": "Data is outdated, refresh the page.",
     "INVALID-PARAMS": "Invalid URL parameters.",
     "LOADING": "Loading…",
     "A11Y-PREV-PAGE": "Previous page",

src/i18n/locales/fr/common.json

@@ -392,6 +392,7 @@
     "CONNECTION-LIVE": "Live",
     "CONNECTION-RECONNECTING": "Reconnecting…",
     "CONNECTION-OFFLINE": "Offline",
+    "STALE-DATA-REFRESH": "Data is outdated, refresh the page.",
     "INVALID-PARAMS": "Invalid URL parameters.",
     "LOADING": "Loading…",
     "A11Y-PREV-PAGE": "Previous page",

src/i18n/locales/it/common.json

@@ -392,6 +392,7 @@
     "CONNECTION-LIVE": "Live",
     "CONNECTION-RECONNECTING": "Reconnecting…",
     "CONNECTION-OFFLINE": "Offline",
+    "STALE-DATA-REFRESH": "Data is outdated, refresh the page.",
     "INVALID-PARAMS": "Invalid URL parameters.",
     "LOADING": "Loading…",
     "A11Y-PREV-PAGE": "Previous page",

src/i18n/locales/ja/common.json

@@ -392,6 +392,7 @@
     "CONNECTION-LIVE": "Live",
     "CONNECTION-RECONNECTING": "Reconnecting…",
     "CONNECTION-OFFLINE": "Offline",
+    "STALE-DATA-REFRESH": "Data is outdated, refresh the page.",
     "INVALID-PARAMS": "Invalid URL parameters.",
     "LOADING": "Loading…",
     "A11Y-PREV-PAGE": "Previous page",

src/i18n/locales/ko/common.json

@@ -392,6 +392,7 @@
     "CONNECTION-LIVE": "Live",
     "CONNECTION-RECONNECTING": "Reconnecting…",
     "CONNECTION-OFFLINE": "Offline",
+    "STALE-DATA-REFRESH": "Data is outdated, refresh the page.",
     "INVALID-PARAMS": "Invalid URL parameters.",
     "LOADING": "Loading…",
     "A11Y-PREV-PAGE": "Previous page",

src/i18n/locales/ru/common.json

@@ -432,6 +432,7 @@
     "CONNECTION-LIVE": "Онлайн",
     "CONNECTION-RECONNECTING": "Соединение…",
     "CONNECTION-OFFLINE": "Нет связи",
+    "STALE-DATA-REFRESH": "Данные устарели, обновите страницу!",
     "INVALID-PARAMS": "Неверные параметры URL.",
     "LOADING": "Загрузка…",
     "A11Y-PREV-PAGE": "Предыдущая страница",

src/i18n/locales/zh/common.json

@@ -392,6 +392,7 @@
     "CONNECTION-LIVE": "Live",
     "CONNECTION-RECONNECTING": "Reconnecting…",
     "CONNECTION-OFFLINE": "Offline",
+    "STALE-DATA-REFRESH": "Data is outdated, refresh the page.",
     "INVALID-PARAMS": "Invalid URL parameters.",
     "LOADING": "Loading…",
     "A11Y-PREV-PAGE": "Previous page",

tests/e2e/helpers/dates.ts

@@ -9,6 +9,10 @@ export function formatYmd(date: Date): string {
   return `${date.getFullYear()}${String(date.getMonth() + 1).padStart(2, "0")}${String(date.getDate()).padStart(2, "0")}`;
 }
 
+export function formatIsoDate(date: Date): string {
+  return `${date.getFullYear()}-${String(date.getMonth() + 1).padStart(2, "0")}-${String(date.getDate()).padStart(2, "0")}`;
+}
+
 export function formatRuDate(date: Date): string {
   return `${String(date.getDate()).padStart(2, "0")}.${String(date.getMonth() + 1).padStart(2, "0")}.${date.getFullYear()}`;
 }

tests/e2e/helpers/onlineboard-fixtures.ts

@@ -0,0 +1,57 @@
+import { addDays, formatIsoDate, formatYmd } from "./dates";
+
+type DateTimeValue = {
+  utc?: string;
+  local?: string;
+  localTime?: string;
+};
+
+type OnlineboardDetailsFixture = {
+  data: {
+    routes: Array<{
+      flightId: {
+        dateLT?: string;
+        date: string;
+      };
+      leg: {
+        departure: { times: Record<string, DateTimeValue> };
+        arrival: { times: Record<string, DateTimeValue> };
+        daysForTabs?: string[];
+      };
+    }>;
+  };
+};
+
+function replaceDatePart(value: string | undefined, isoDate: string): string | undefined {
+  return value?.replace(/^\d{4}-\d{2}-\d{2}/, isoDate);
+}
+
+export function nextOnlineboardDetailsFixture(raw: string): {
+  body: string;
+  compactDate: string;
+} {
+  const date = addDays(new Date(), 1);
+  const isoDate = formatIsoDate(date);
+  const compactDate = formatYmd(date);
+  const fixture = JSON.parse(raw) as OnlineboardDetailsFixture;
+
+  for (const route of fixture.data.routes) {
+    route.flightId.date = isoDate;
+    route.flightId.dateLT = isoDate;
+
+    for (const point of [route.leg.departure, route.leg.arrival]) {
+      for (const value of Object.values(point.times)) {
+        const utc = replaceDatePart(value.utc, isoDate);
+        if (utc !== undefined) value.utc = utc;
+        const local = replaceDatePart(value.local, isoDate);
+        if (local !== undefined) value.local = local;
+      }
+    }
+
+    route.leg.daysForTabs = Array.from({ length: 15 }, (_, index) =>
+      formatYmd(addDays(date, index)),
+    );
+  }
+
+  return { body: JSON.stringify(fixture), compactDate };
+}

tests/e2e/online-board.spec.ts

@@ -264,6 +264,55 @@ test.describe("Online Board", () => {
     await expect(arrInput).toHaveValue("Самара");
   });
 
+  test("route results show stale-data overlay after inactivity timeout", async ({
+    page,
+    consoleMessages,
+  }) => {
+    await page.addInitScript(() => {
+      const target = window as unknown as { __ENV__?: Record<string, string> };
+      target.__ENV__ = {
+        ...(target.__ENV__ ?? {}),
+        REFRESH_PAUSE_MIN: "0.01",
+        REFRESH_STOP_MIN: "1",
+      };
+    });
+    await routeDictionaryFixtures(page);
+    await routeOnlineboardRouteFixtures(page);
+
+    await page.goto(`/ru/onlineboard/route/MOW-KUF-${formatYmd(new Date())}`);
+    await expect(page.locator('[data-testid="online-board-search"]')).toBeVisible({
+      timeout: 10000,
+    });
+
+    await expect(page.locator('[data-testid="stale-data-overlay"]')).toHaveText(
+      "Данные устарели, обновите страницу!",
+      { timeout: 2000 },
+    );
+  });
+
+  test("route results redirect to main page after stale-data stop timeout", async ({
+    page,
+    consoleMessages,
+  }) => {
+    await page.addInitScript(() => {
+      const target = window as unknown as { __ENV__?: Record<string, string> };
+      target.__ENV__ = {
+        ...(target.__ENV__ ?? {}),
+        REFRESH_PAUSE_MIN: "0.001",
+        REFRESH_STOP_MIN: "0.02",
+      };
+    });
+    await routeDictionaryFixtures(page);
+    await routeOnlineboardRouteFixtures(page);
+
+    await page.goto(`/ru/onlineboard/route/MOW-KUF-${formatYmd(new Date())}`);
+    await expect(page.locator('[data-testid="online-board-search"]')).toBeVisible({
+      timeout: 10000,
+    });
+
+    await page.waitForURL(/\/(ru\/onlineboard)?$/, { timeout: 4000 });
+  });
+
   // Requires live API (calendar days endpoint).
   // Skipped when WAF blocks flights.test.aeroflot.ru.
   test.skip("route search results page shows calendar strip with day numbers", async ({

tests/e2e/onlineboard-aircraft-link.spec.ts

@@ -2,6 +2,7 @@ import { test, expect } from "./fixtures/console-gate";
 import fs from "node:fs";
 import path from "node:path";
 import { fileURLToPath } from "node:url";
+import { nextOnlineboardDetailsFixture } from "./helpers/onlineboard-fixtures";
 
 // TIRREDESIGN-24 — in the online-board flight details card, the aircraft
 // title under "Борт" must be a clickable external link that opens in a new tab.
@@ -22,11 +23,13 @@ test("Onlineboard details aircraft title opens Aeroflot plane park in a new tab"
   context,
   consoleMessages,
 }) => {
+  const details = nextOnlineboardDetailsFixture(onlineboardDetails);
+
   await page.route("**/api/flights/v1.1/ru/onlineboard/details?**", async (route) => {
     await route.fulfill({
       status: 200,
       contentType: "application/json",
-      body: onlineboardDetails,
+      body: details.body,
     });
   });
 
@@ -38,7 +41,7 @@ test("Onlineboard details aircraft title opens Aeroflot plane park in a new tab"
     });
   });
 
-  await page.goto("/ru-ru/onlineboard/SU6951-20260514");
+  await page.goto(`/ru-ru/onlineboard/SU6951-${details.compactDate}`);
 
   const aircraftRow = page.locator('[data-testid="details-row-aircraft"]');
   await expect(aircraftRow).toBeVisible({ timeout: 15000 });

tests/e2e/onlineboard-details-transition-visibility.spec.ts

@@ -2,6 +2,7 @@ import { test, expect } from "./fixtures/console-gate";
 import fs from "node:fs";
 import path from "node:path";
 import { fileURLToPath } from "node:url";
+import { nextOnlineboardDetailsFixture } from "./helpers/onlineboard-fixtures";
 
 const FIXTURE_DIR = path.resolve(
   path.dirname(fileURLToPath(import.meta.url)),
@@ -16,24 +17,26 @@ test("TIRREDESIGN-7: onlineboard details shows non-scheduled transition even whe
   page,
   consoleMessages,
 }) => {
-  const details = structuredClone(baseDetails);
+  const shifted = nextOnlineboardDetailsFixture(JSON.stringify(baseDetails));
+  const details = JSON.parse(shifted.body);
   const flight = details.data.routes[0];
   const leg = flight.leg;
+  const isoDate = `${shifted.compactDate.slice(0, 4)}-${shifted.compactDate.slice(4, 6)}-${shifted.compactDate.slice(6, 8)}`;
 
   flight.status = "InFlight";
   leg.status = "InFlight";
   leg.transition = {
     registration: {
       start: {
-        utc: "2026-05-14T07:00:00Z",
-        local: "2026-05-14T10:00:00+03:00",
+        utc: `${isoDate}T07:00:00Z`,
+        local: `${isoDate}T10:00:00+03:00`,
         dayChange: { value: 0, title: "" },
         localTime: "10:00",
         tzOffset: 180,
       },
       end: {
-        utc: "2026-05-14T07:30:00Z",
-        local: "2026-05-14T10:30:00+03:00",
+        utc: `${isoDate}T07:30:00Z`,
+        local: `${isoDate}T10:30:00+03:00`,
         dayChange: { value: 0, title: "" },
         localTime: "10:30",
         tzOffset: 180,
@@ -51,7 +54,7 @@ test("TIRREDESIGN-7: onlineboard details shows non-scheduled transition even whe
     });
   });
 
-  await page.goto("/ru-ru/onlineboard/SU6951-20260514");
+  await page.goto(`/ru-ru/onlineboard/SU6951-${shifted.compactDate}`);
 
   const registrationRow = page.locator('[data-testid="details-row-registration"]');
   await expect(registrationRow).toBeVisible({ timeout: 15000 });

tests/e2e/schedule-details-day-tabs-operating-days.spec.ts

@@ -52,7 +52,6 @@ test("TIRREDESIGN-26: schedule details day tabs disable non-operating flight dat
   await expect(page.getByTestId("day-tabs")).toBeVisible({ timeout: 15000 });
   await expect(page.getByTestId("day-tab-20260519")).toBeEnabled();
 
-  await page.getByTestId("day-tabs-next").click();
   const nonOperatingFriday = page.getByTestId("day-tab-20260522");
   await expect(nonOperatingFriday).toBeDisabled();
   await expect(page.getByTestId("day-tab-20260523")).toBeEnabled();

tests/e2e/schedule-route-buy-button.spec.ts

@@ -12,6 +12,26 @@ import { routeScheduleVvoMjzFixtures } from "./helpers/api-fixtures";
 test("schedule route page surfaces the buy ticket button inside an expanded flight body", async ({
   page,
 }) => {
+  await page.addInitScript(() => {
+    const fixedTime = new Date("2026-05-17T00:00:00+03:00").getTime();
+    const RealDate = Date;
+    const FixedDate = function fixedDate(
+      this: Date,
+      ...args: unknown[]
+    ) {
+      return args.length === 0
+        ? new RealDate(fixedTime)
+        : Reflect.construct(RealDate, args);
+    } as unknown as DateConstructor;
+    FixedDate.now = () => fixedTime;
+    FixedDate.parse = RealDate.parse;
+    FixedDate.UTC = RealDate.UTC;
+    Object.defineProperty(FixedDate, "prototype", {
+      value: RealDate.prototype,
+    });
+    Object.setPrototypeOf(FixedDate, RealDate);
+    window.Date = FixedDate;
+  });
   await routeScheduleVvoMjzFixtures(page);
   // Pick a calendar week well clear of the 2h pre-departure cutoff so every
   // flight in the list is inside the buy window. Earlier-this-week URLs hit